Measuring contact sequence in tap changer

FIELD: electricity.

SUBSTANCE: tap changer for a transformer comprises a cylinder and a shaft which is rotatably arranged inside the cylinder. The cylinder is provided with fixed contacts and the shaft is provided with a contact circuit facing the cylinder and including mechanical contacts, wherein the mechanical contacts are adapted to selectively mate with the fixed contacts of the cylinder upon rotation of the shaft. The contact circuit also includes at least two measuring points for measuring the characteristics of the contact circuit. The tap changer comprises at least one measuring contact device, which is electrically connected to the respective measuring points in the contact circuit. The measuring contact device is placed inside the shaft.

EFFECT: wider field of use of the tap changer and the measurement method by facilitating access to measuring points of the tap changer.

14 cl, 8 dwg

 

The technical FIELD

The present invention relates to a switch branch windings of the transformer and the control switch branches.

PRIOR art

The invention relates to a switch branches for a transformer mainly to the cylindrical switch branches, in which the insulated cylinder fitted with fixed contacts branches for different voltage levels, and within the cylinder is a rotating shaft, provided with the relevant parts of the movable contact. Each movable contact facing outwards from the shaft to the interior of the cylinder and contains at least one or, for example, two mechanical contact, which can be brought into contact with the corresponding fixed contact of the cylinder.

In the example of the switch branch known type, which contains a number of mechanical contacts, which rotate together with the shaft, the mechanical contacts are placed in parallel branches of contacts for connection with the fixed contacts of levels of branches. One of the mechanical contacts connected in series with the switch of the vacuum interrupter and the other mechanical contact connected in series with the second vacuum interrupter and a resistor. In a multiphase system transformation is rmotor contains levels of branches for each phase, and each phase includes two movable mechanical contact, is placed on the rotating shaft of the switch branch.

Switch branches such cylindrical type described in DE 10 2004 052 316. The document describes how to measure the sequence of contacts of the switch branch. Measurements are made by connecting the measuring circuit between the two parallel branches. The measuring circuit is connected by removing the shaft from the cylinder, then the measuring circuit is connected to two branches of the movable contact by means of connecting cables, after which the shaft is again installed in the cylinder (§25). The measuring circuit is connected to the first connection point between the mechanical switch and vacuum interrupter in the first branch and the second connection point between the resistor and the vacuum interrupter of the second branch. The measuring circuit includes a source of DC voltage and resistor in series, and the voltage across the resistor is monitored (Fig. 6-8). During the switching of the branches of one of the branches disconnect from the current level of branches and connect to the next level before another branch. The measuring system registers a voltage change when switching branches, for example, from the opening of the vacuum interrupter branch to resist the rum at the current level branches to the vacuum circuit breaker to the other branch at the next level (§28). Measurement provides valuable information about the state of the switches, but is difficult and time-consuming.

Also reinstall the switch branch complicated and may cause damage to the switch branch and its contacts, so that the measurement results are incorrect.

In addition, the measuring circuit can not detect the opening of the mechanical switch in the branch with a resistor when both branches are connected in parallel to a single branch.

A BRIEF STATEMENT of the substance of the INVENTION

The invention aims to overcome the disadvantages of the prior art and the creation of the switch branch, transformer and method for the measurement of the sequence of contacts of the switch branch in the transformer.

The task is to create the switch branch and method of measurement that can be used as a factory during the manufacturing process, and control switches branches in operation.

According to the invention, a switch branch in accordance with paragraph 1 of the claims, in which the contacts are placed inside the shaft of the switch branch, which facilitates access to the measuring points of the switch branch.

These contacts can be properly placed is for easy access and to ensure the connection between the contact circuits of the switch branch and measuring equipment, when the switch branch is located in the transformer, so no need removing the switch branches from the transformer when testing the functionality of the switch branch.

According to the invention, also a method of measurement in accordance with paragraph 11 of the claims, and performance may be measured at the location of the switch branch inside the transformer in the measurement process.

The method for measuring the sequence of contacts of the switch branch in the transformer, and the switch branch is located inside the transformer and includes a cylinder and a shaft that is positioned for rotation within the cylinder, and the cylinder is provided with stationary contacts, turned inward from its inner surface, a shaft provided with a contact scheme, which includes mechanical contacts facing to the cylinder and configured to selectively connect with the fixed contacts of the cylinder during the rotation of the shaft, wherein the shaft inside place the measuring contact device and the contact device electrically connected to the measuring points of the contact schema, the method includes a step at which unlock and close contacts of the contact circuit and measure electrical changes lie in the opening and closing contacts. The method is characterized by the stage at which insert the measuring head equipped with the measuring contacts, the shaft of the switch branch.

Preferably, the step of inserting the measuring heads perform when the switch branch is located inside the transformer.

Performing a measurement sequence of the contacts of the switch branch at the location of the switch branch inside the transformer can save you valuable time and labor. Since the switch branch is not removed from the transformer, significantly reduces the risk of damage to the switch branch because it does not require re-installation of the shaft of the switch branch with his contacts inside the cylinder.

Variants of the embodiment of the switch branch and method according to the invention facilitate the measurement sequences of contacts in a variety of switches branches. Method and switch branches can be used to improve many types of cylindrical switch branches and facilitate monitoring and maintenance of their contacts.

In a variant of embodiment of the measuring contact device of the switch branch contains at least two individual contact surface, and contact the diagram contains two measuring points and, each of the contact surfaces are connected respectively with one of the measuring points. Thus, the connection of the contact device and measuring equipment provides access to both measuring points.

In a variant embodiment of the switch branch contains three measuring contact device and three measuring circuit, each contact device placed inside the shaft and connected respectively with one of the three measurement schemes. This is particularly useful for three-phase systems. In a variant of embodiment of the measuring contact device contains three separate contact surface, and contact the scheme contains three measuring points, each of the contact surfaces are connected respectively with one of the measuring points. The three measurement points for each phase provides improved measurement capabilities.

The preferred embodiment includes a set of conductors located between the corresponding measuring point and the contact surface and extending from the outer side of the shaft to a corresponding one of the contact surfaces inside the shaft.

In a variant embodiment of the switch branch contains the upper portion of the cover (19) and resealable opening (9)located in the roof is e (19), and resealable opening (9) is arranged to provide access to the shaft (2). Thus, the shaft contacts can be accessed for inspection, and switch branches can be sealed by using a transformer for power transmission.

In a variant embodiment of the contact schema contains two branches, the first branch includes a first mechanical contact, the first vacuum interrupter and a protective resistor, the second branch includes a second mechanical contact and the second vacuum interrupter. Switches branches with vacuum breakers advantageous for transformers medium and high voltages, for example, above 5 kV. Switches branches with vacuum breakers require less maintenance than switches branches having only mechanical contacts. The invention also has the advantage to switch branches only with mechanical contacts.

Preferably, the measurement method includes a stage on which connect the measuring contacts with the contact device, and the phase connection is performed after insertion of the measuring head in the shaft.

Preferably, the measurement method includes a stage on which to remove the measuring head from the shaft, including destruction of the measuring head is from the transformer, the stage is implemented after phase trip circuit and dimension. Extension of the measuring head from the transformer is less complicated and less time consuming process than the rise of the Central shaft, which includes the movable contacts of the transformer.

Preferably, the measurement method includes a stage on which close the switch branch after the stage of removal of the measuring head. Thus, the transformer is sealed and can be re-connected to the transmission network.

The invention also provides a transformer comprising a switch branch according to the invention and use of its advantages. The transformer has two windings, one of which is regulating winding, and switch branches made with the possibility of choosing the level of branches of the regulating winding.

The invention also provides a measuring apparatus for measuring a sequence of contacts in the switch branch according to the invention. The measuring equipment includes a measuring head provided with a measuring contacts adapted for mating connection, at least one contact device, which is placed inside the shaft of the switch branch.

The invention provides Pere who luchtel branches and the way through which you can control the functioning of all of the individual switches. The method can be used during production and installation, as well as to control the operation and maintenance of switch branches throughout his life.

In General, all materials used in the claims, the terms should be interpreted in accordance with their generally accepted meaning in the art, if this application is not otherwise specified. All references to “element, device, component, means, step, etc. should directly be interpreted as a reference, at least one example of an element, device, component, means, step, etc. unless otherwise specified. The order of execution phases of any disclosed in the present application of the method does not have to exactly match the opened order, unless otherwise specified.

BRIEF DESCRIPTION of DRAWINGS

The invention is further explained in the description of the preferred variants of the embodiment with reference to the accompanying drawings, in which:

Fig. 1 illustrates the switch branch;

Figure 2 illustrates the upper section of the switch branch of figure 1;

Fig. 3 illustrates a schematic diagram of the switch branch;

Fig. 4 illustrates a schematic diagram of the switch otvet the response connected with the measuring equipment;

Fig. 5 illustrates an example of measuring equipment for connection to the switch branch;

Fig. 6 illustrates the normal mode switches to switch branches, measured in figure 4;

Fig. 7 illustrates a method of measurement in accordance with the invention.

Fig illustrates a transformer with switch branches.

DESCRIPTION of the PREFERRED EMBODIMENT VARIANTS of the INVENTION

In Fig. 1 shows a cylindrical switch 4 branches for installation in transformer and connection with the regulating winding of the transformer. Switch 4 branches contains the external cylinder 1, surrounding the inner shaft 2. The shaft 2 is placed rotatably in the cylinder 1. Switch 4 branches is three-phase and has a terminal layout 100-102 for each of the three phases 100-102, placed at three heights, following the circumference at three levels 100-102 cylinder 2. Each level includes multiple spaced apart terminals 110-139 on the outside of the cylinder 2 to provide compounds with many different branches of each of the regulating windings (not shown) of the transformer. The figure illustrates the switch 4 branches, having ten terminals 110-139 for each phase, of which six terminals 110-139 visible on the figure,and the other four are located on the hidden side of the cylinder. Each of the terminals 110-139 around the cylinder provides the electrical connection with the corresponding fixed contacts (3 in Fig. 2) inside the cylinder 2. These fixed contacts facing inwards towards the shaft 2 in the center of the cylinder 1. The shaft 2 is in turn provided with a terminal layouts 103-105, facing outwards to the stationary contacts of the cylinder 1. The shaft 2 includes three terminal layout 103-105, one for each phase. Terminal layout 103-105 contain mechanical contacts attached to the shaft 2, and moves when the rotation shaft 2, entering into contact with the fixed contacts of the cylinder 1, so that rotation of the shaft 2 could be selected a specific branch 110-139 for each phase, so that each terminal layout 103-105 shaft is in mating contact with the corresponding fixed contact in the cylinder 1 for each phase. Terminal layout 103-105, respectively, also include vacuum circuit breaker (33, 36 in Fig. 3), placed in series with mechanical contacts. In the diagram of Fig. 3 and 4 is illustrated a mechanical contacts (32, 35) and vacuum breakers (33, 36)located between the shaft and the cylinder. These terminal layout 103-105 connected by appropriate cables 106-108 contact devices 140-142, which is placed inside the shaft 2, i.e. the shaft is hollow and is provided with contact us what devices 140-142 in its inner part, one such contact device for each phase.

As illustrated, each contact device 140-142 contains three contacts, and preferably, each cable 106-108 included three conductor, electrically connected to three different measuring points in the terminal pages 103-105. These measuring points (A, B, C) is illustrated additionally in Fig. 3 and 4. Each of the three contact devices 140-142 includes three measuring contact 140A-C, and these measuring contacts 140A-C are adapted and located to provide electrical connection with the measuring equipment, is illustrated in figure 5. For this purpose, the measuring equipment includes a rod 51, which is equipped with three groups 52a-measuring contacts are placed so that they are spaced from each other by the same distance that the posted contact devices 140-142. A larger image of the three measuring contact surfaces 140A-contact devices 140-142 provided in Fig. 1 to the right of the switch 4 branches.

Illustrated switch 4 branches also contains preselector 20, but the invention can be used in switches branches that do not contain the preselector.

In Fig. 2 shows the upper end of the switch 4 branches on IG, showing the cylinder 1 with the shaft 2 located rotatably on the inside, and the cover 19 on the top of the cylinder. Mechanical contact terminal 32 pages 103-105 illustrated in mating contact with a fixed contact 3, located on the inner side of the cylinder 1 and providing the connection terminal 110 branches on the outside of the cylinder 1. The cover is provided with a resealable opening 9 to the input of the measuring devices (such as the rod 51 in Fig. 5)containing the measuring contacts (52 in Fig. 5) for connection with the internal measurement contacts (140A-C in Fig. 1) shaft. Cover can be provided in the form of a removable cover that covers the access hole for the shaft during use of the transformer. When measuring the operating characteristics of the switch 4 branches and contacts 103-105 cover removed, so that access is provided measuring equipment for measuring contacts 140-142 inside the shaft. This access can be provided at the location of the switch 4 branches inside the transformer, so you don't need to lift and remove the switch 4 branches of this transformer when performing the measurement process.

In Fig. 3 shows the contact circuit 31, which is suitable for the terminal pages 103-105 of the shaft, for each phase, and the terminal layout 103-105 Conn who are satisfied with a fixed contact 3 cylinder on the branch n adjustment unwinding. Thus, the contact circuit 31 is an example of a movable contact 103-105 shaft 2. Contact circuit 31 includes two mechanical contact 32, 35, made with the ability to log in mated contact with the corresponding fixed contact (3) of the cylinder. Mechanical contacts 32, 35 are placed in two parallel branches for connection with the fixed contacts of levels of branches, illustrated as n and n+1. One of the mechanical contact 35 is connected in series with the switch of the vacuum interrupter 36, and the other mechanical contact 32 is connected in series with the second vacuum interrupter 33 and resistor 34. When the movable contact 31 is moved from the first branch n and the first fixed contact of the cylinder on the second connecting n+1, the branch comprising a resistor 34 and a vacuum breaker 33, comes in contact with the second stationary contact branch n+1. The resistor 34 is designed to help protect switch 4 branches from circulating currents resulting from the connection of two branches (n, n+1). The shaft is also appropriately located so that it can be rotated in the opposite direction from the junction of n+1 to the first branch n, in which case, the branch, which includes the resistor 34, moves the latter from the second branch n+1, and resistor 34 in this case, so the e protects the contact circuit 31 from the circulating currents.

The movable contact 31 is supplied with the measuring points a, b, C on two branches of a circuit for measuring the performance of mechanical contacts 32, 35 and vacuum breakers 33, 36. The first measuring point And provided between the first mechanical contact 35 and the first vacuum interrupter 36, i.e. at the intersection of the first mechanical contact 35 and the first switch of the vacuum interrupter 36 of the first branch. The second and the third measuring point, C is provided between the second mechanical contact 32 and the second vacuum interrupter 33, i.e. on the line of connection of the second mechanical contact 32 and the second vacuum interrupter 33 of the second branch. These measuring points are provided on the corresponding side protective resistor 34. The second measuring point is provided between the second vacuum interrupter 33 and resistor 34. The third measuring point is provided between the second mechanical contact 32 and resistor 34.

Figure 4 shows a measuring device 37, 38, connected to the measuring points a, b, C of the rolling-contact shaft 31. The first measuring device 37 is connected between the second and third measurement points and parallel to the resistor 34. The second measuring device is connected between the two branches, i.e. between the first measuring point And the first branch and the second measuring the second point In the second branch. Each of the measuring devices includes a constant current source and voltmeter, the recording voltage as a function of time. Alternatively, the currents and voltages between a and b and between b and C is measured by the voltmeters and ammeters to determine the resistance of the contact schema and changes resistance when opening and closing the contacts. Measurements can be used to determine the status of each contact, for example, level 1 for closed contact and level 0 for open contact, and can be represented as a function of time as illustrated in Fig. 6.

In Fig. 5 shows an example of measuring equipment 50 to perform measurement of the operating characteristics of the switch contacts 4 branches. Measuring equipment 50 includes measuring tools(37, 38, 54, 55), located outside of the switch branch during the measurement sequence of contacts, and means 51, 52 for connection of instruments with measuring the contact devices 140-142 on the shaft of the switch branch, for example, an elongated rod 51, provided with a measuring contacts 52A-C. Connecting means 51, 52 adapted to be inserted into the shaft (2) through the resealable opening (9 in Fig. 2) switch branches. The measuring equipment includes measuring goal the internals 51 in the form of a rod 51. The probe 51 is equipped with a large variety of test contacts 52, the respective measuring the contact devices 140-142 (Fig. 1)inside the shaft 2. The measuring head has a first 52a, the second 52b and the third s group measuring contacts, and each group 52a-includes first, second and third contact for connection respectively with one of the three contacts 140A-WITH each of the contact devices 140-142 shaft. Thus three contacts of each group can be connected to the measuring points a, b, C, movable contact 31. When the measurement run and the cover 19 (Fig. 2) is removed, the probe 51 is inserted, these measuring contacts 52a, a total of nine, connected with nine corresponding measuring contacts 140A-shaft, through which three cables 106-108 connected to the rolling contact 103-105, 31 of the shaft 2. The measuring equipment includes a controller or unit 54 of the control, which is equipped with a display 55 for providing results to the operator. The controller is connected to the terminal 51 through the cable 53, suitably includes one separate cable for each of the measuring points a-C of the switch branch for which accommodates the measuring cylinder 51. The controller 54 includes measuring devices and sources 3, 38 DC, which is connected to the measuring points a-C via the cable 53, the cylinder 51 and measuring the contact 52. The controller 54 is located outside of the transformer during the measurement sequence of contacts. The controller 54 suitably configured to control the measurement and determination of results for the operator.

Alternatively, a single unit 54 of the control, with the possibility of information transmission can be connected to a computer with a user interface that includes a display 55 for the control of the measuring unit, which includes measuring instruments, for example, the DC power source and an ohmmeter or, for example, the DC power source and the voltmeter and ammeter.

In Fig. 6 shows the sequence of switching of the switch 4 branches, when the movable contacts 12, 31 are moved from the first branch (n) regulating winding to the second branch (n+1) transformer. Branch with resistor movable contact 31 is first moved to the second branch, i.e. the branch with the second mechanical contact 32 and the second vacuum interrupter 33. The movement is ensured by the rotation of the shaft 2 together with the branch with a resistor placed in front of the other branch. When the second mechanical contact 32 is disconnected from the branch n, HAC is smart interrupter 33 this branch opens. Next, the second mechanical contact 32 is mated with the second branch (n+1), and the second vacuum interrupter 33 is then closed. The first vacuum interrupter 36 is then opened, before mechanical contact 35 moves away and removed from the first branch. The first mechanical contact 35 is rotated together with the shaft and mates with the fixed contact of the second branch, after which the rotation shaft is stopped. The first vacuum interrupter 36 is not closed again until mechanical contact 35 will not be connected with the second branch (n+1).

In Fig. 7 shows the sequence of steps of the method for measuring the operating characteristics of the contacts of the switch branch during switching. The method begins with the install phase, when the measuring equipment is connected to the switch branch. The installation includes the location of the measuring head 51 on the inside of the shaft 2 of the switch branch at the location of the switch 4 divisions within the transformer 18, so that the measuring head is placed inside the transformer. First, at step 71, open the lid switch branches. Secondly, at step 72, insert the measuring head in the hole. Then, at step 73, measuring contacts 140A-C, 52a-C are connected to each other 52a-C, 140A-C, i.e. the measuring contacts 52a-th is ovci 51 match with corresponding measuring contacts 140A-shaft. Thus, the phase of installation provides the electrical connection between the measuring equipment 37, 38, 54, 55 and the measuring points a, b, C in pin diagram by placing the measuring head 51 with the measuring contacts 52a-with the inside of the transformer 18.

When the installation is complete, start the phase measurement. Phase measurement includes performing a measurement sequence of contacts, during which the performance of the contacts 32, 33, 35, 36 are controlled measuring equipment 37, 38, 54, 55. At step 74 between the measuring points apply constant currents. When using a contact device 31, such as the device illustrated in Fig. 3 and 4, this step includes the application of a constant current between the measuring points a and b and between the measuring points b and C, respectively, i.e. the first current is applied between the two branches, and the second current is applied in parallel to the resistor 34. Then initiate and subsequently perform the measurement of the electric characteristics (step 75). Control voltages and currents (step 76) between the measuring points a and b and between b and C and determine the result (step 77). Within this dimension, connect and disconnect four contact 32, 33, 35, 36 of the two branches of the rolling contact 103-105, 31 of the shaft 2 of the switch branch and control the shape of the voltage levels via the controller 54 at step 76. The results appropriately represent on the display 55 of the measuring equipment.

When the phase measurement is completed, the method includes the delete phase, during which remove the measuring equipment of the transformer. The measurement ends, and delete phase begins disconnecting the measuring contacts 140-142A-C (step 78), the head is removed from the transformer (step 79), i.e. from the inner part of the shaft of the switch branch, and close the cover (step 80).

In Fig. 8 shows a transformer 18 containing the switch 4 branches with a cover 19. The transformer includes three terminals 16 of the primary winding and three terminals of the secondary winding 17. Switch 4 branches made with the possibility of changes in the transformation of the voltage between the terminals of the primary winding 16 and the terminals of the secondary winding 17. Switch 4 branches provided with a cover 9 that covers the access to its shaft, which provided many of the measuring contacts 140A-C, a, 142a-C in Fig. 1)connected to the measuring points a, b, C in the contact circuits located outside of the shaft and inside the transformer. The placement of the measurement points inside the shaft of the switch 4 branches simplified measurement sequence of contacts. Switch 4 branches remains inside the transformer 18 in the lifetime measurement the Oia sequence of contacts, i.e. the installation of measuring equipment to remove it. Cylinder switch branches appropriately sealed and is filled with liquid insulating medium such as oil. The transformer 18 also contains a liquid insulating medium, for example oil, outside of the switch branch, and the oil of the transformer is isolated from the oil switch branches.

1. Switch (4) branches for the transformer containing the cylinder (1) and shaft (2)which is placed rotatably in the cylinder (1)and the cylinder (1) is provided with a fixed contact (3), the shaft is provided with a contact scheme, addressed to the cylinder and includes mechanical contacts (32, 35), and mechanical contacts (32, 35) configured to selectively mate with a fixed contact (3) of the cylinder (1) when the shaft (2), when this contact scheme (31) also includes at least two measuring points (a-C) for measuring the characteristics of contact circuit (31), characterized in that it contains at least one measuring contact device (140-142), which is electrically connected with the respective measuring points (a, b, C) in the contact circuit, and measuring the contact device (140-142) located inside shaft (2).

2. Switch (4) branches according to claim 1, characterized in that the measuring contact device (140-142) contains, at least two separate contact surfaces 140A-C), and contact the scheme (31) contains two measuring points (a-C), each of the contact surfaces (140A-C) are connected respectively with one of the measuring points (a-C).

3. Switch (4) branches according to claim 1, characterized in that it contains three measuring contact device (140-142) and three pin circuits (31, 103-105), with each of the contact devices (140-142) located inside shaft (2) and connected respectively with one of the three contact circuits (31, 103-105).

4. Switch (4) branches according to claim 3, characterized in that each measuring contact device (140-142) contains three separate contact surfaces 140A-C), and contact the scheme (31) includes three measuring points (a-C), each of the contact surfaces (140A-C) are connected respectively with one of the measuring points (a-C).

5. Switch (4) branches according to any one of claim 2 to 4, characterized in that it includes many conductors (106-108 a-C), each of which is placed between the corresponding measuring point (a-C) and contact surface (140A-C) and passes from the outer side of the shaft (2) according to one of the contact surfaces (140A-C) inside shaft (2).

6. Switch branches according to claim 1, characterized in that it has a cover (19) and resealable hole 9), located in the lid (19), and the resealable opening (9) is placed for access to the shaft (2).

7. Switch branches according to claim 1, characterized in that the contact scheme (31) contains two branches, the first branch includes a first mechanical contact (32), the first vacuum interrupter (33) and a protective resistor (34), the second branch includes a second mechanical contact (35) and the second vacuum interrupter (36).

8. The transformer (18), containing two windings, one of which is regulating winding, and switch branches made with the possibility of choosing the level of branches of the regulating winding, characterized in that the switch branch is executed according to any one of the preceding paragraphs.

9. Measuring equipment (50) for measuring the sequence of contacts in the switch (4) branches according to any one of claims 1 to 7, containing the measuring head (51), equipped with a measuring contacts (52a-C), providing a connection, at least one contact device (140-142), located inside shaft (2) switch branches.

10. Method of measurement sequence switch contacts (4) branches in the transformer (18), and switch (4) branches placed inside the transformer (18) and contains a cylinder (1) and shaft (2), which is available with the possibility of rotating the inside of the cylinder (1), when the cylinder (1) is provided with a fixed contact (3), shaft (2) is provided with a contact scheme (31), which includes mechanical contacts (32, 35)facing the cylinder (1) and is configured to selectively mate with a fixed contact (3) of the cylinder during the rotation of the shaft (2), while measuring contact device (140-142) located inside shaft (2)and the contact device (140-142) electrically connected to the measuring points (a-C) contact circuit (31), the method includes a step (76), which unlock and close the contacts (32, 33, 35, 36) of the contact circuit (31) and measure changes in electrical characteristics by measuring equipment (50) during the opening and closing of the contacts, characterized in that thecontains the stage at which insert the measuring head (51), equipped with a measuring contacts (52A-C) in the shaft (2) switch branches.

11. The method according to claim 10, characterized in that the step of inserting the measuring heads perform in the presence of the switch branch inside the transformer (18).

12. The method according to claim 10 or 11, characterized in that it contains a stage on which connect the measuring contacts (52A-C) with contact devices (140-142), and the phase connection is performed after inserting the measuring head (51) in the shaft (2).

13. The method according to any of PP-12, wherein the gain stage (78), which remove the measuring head (51) of the shaft, including destruction of the measuring head (51) of the transformer, and step (78) is performed after step (76) trip circuit and dimension.

14. The measuring method according to item 13, characterized in that it includes a step (80), which close the switch branch after step (78) remove the measuring head (51).



 

Same patents:

FIELD: electricity.

SUBSTANCE: invention relates to a manual drive for stepwise control of a step transformer winding tap changer with a locking device, without power consumption. Besides, there is a master shaft, on which per one change there are several manual rotations implemented. There is also a control mechanism, which converts these rotations exactly into one rotation of a geared wheel per one change. The locking mechanism comprises a rotary inner key and a latch rotating around the axis of rotation and a stop, which corresponds to the stop slot of the master shaft, and a stop cam, which corresponds to the slot of the geared wheel of the control mechanism. Due to actuation of the inner key, the latch rotates from the locked position so that the stop and the stop cam are disengaged from the appropriate slots.

EFFECT: higher reliability of protection in respect to undeliberate or deliberate incorrect usage of a manual drive.

7 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: invention is designed for changing taps in power transformers. A modified diverter switch comprises mechanical and electric interface, compatible with a switch body, main and intermediate contacts, a holder of current-limiting resistance comprising an interface coupled with the body of the available tap changer for provision of modification of the diverter switch, besides, multiple modules of current-limiting resistances may be connected together. The diverter switch may comprise a vacuum switch and may be installed in a body of the available tap changer.

EFFECT: invention provides for simple tuning of a diverter switch to user requirements for various use and possibility to modify an on-load tap changer.

6 cl, 10 dwg

Switchgear // 2449401

FIELD: electricity.

SUBSTANCE: in several horizontal planes around rotating switching axis on insulating frame, fixed contacts are located. These contacts contain upper and lower contact fingers which are released and closed by electroconductive bus as moving switching contact.

EFFECT: design simplification, functionality enhancement and increase in durability.

9 cl, 8 dwg

FIELD: electricity.

SUBSTANCE: compartment (2) of the electric motor within the on-load tap changer comprises an electric motor module and a control module (12). The module of the electric motor comprises an electric motor (6), a reducer (7) and a position sensor (9), besides, the control module (12) is made with the possibility to control an output shaft (3), which goes out from the compartment (2) of the electric motor, by means of power supply to the electric motor (6) via a direct connection to put the output shaft (3) in motion via a reducer (7), besides, the position sensor (9) is made with the possibility to register motion and positions of the output shaft (3) and to transfer information about such to the control module (12). The compartment (2) of the electric motor in the working condition is tightly closed with the electric motor module and the control module (12), arranged inside such tightly closed volume.

EFFECT: reduced time for production deployment, increased flexibility for making changes into the order at the later stages of its completion, increased convenience of service, reduced cost of the electric motor for the on-load tap changer.

7 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: high-voltage semiconducting switching device consists of selected by leakage current series connected unpackaged semiconducting elements that are centred and isolated by side surface with the help of fluoroplastic rings, housing, clamping system and current-carrying electrodes. The housing is made of isolating material with high mechanical and electrical strength. At both housing ends there are rigidly fixed metal flanges that are included in clamping system with threaded holes. At bolting of switching device cover to housing flanges with the help of clamping system elements located inside the cover there created is necessary compressive force of semiconducting devices and its transmission through the housing to semiconducting devices. Note that at the same time there performed is pressurisation of inner volume of switching unit housing by O-rings located between flanges and current-carrying electrodes.

EFFECT: increase of specific switching power of high-voltage semiconducting switching device current at simultaneous improvement of its switching characteristics.

5 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: device for transmission of rotational movement includes movement conversion unit that includes intermediate element (3) connected with rotation axis (3a) with the possibility of rotating round it, mechanical energy accumulating unit (5) in a form of spring device, unit of stretchable/compressible spring connected with solid clamp and movable clamp and means of transmitting mechanical energy accumulated in spring device to driven element (2) via drive shaft (2a). Note that intermediate element (3) contains cam drive roller interacting with energy accumulating unit (5). Movable clamp is equipped with rolling element that contacts with drive roller periphery. Movable clamp can be performed with the possibility of moving in radial direction parallel to plane of drive roller. Method of transmission of rotational movement to element includes transmission of mechanical energy accumulated in spring device to drive shaft. Application of proposed device for rotational movement transmission is performed with the possibility of winding switch contacts' control under load in transformer or stabiliser.

EFFECT: improvement of rotational movement transmission use.

15 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention relates to mechanical switching contact with insulating holder (1), where fixed contacts (4, 5, 6) are arranged. Besides lever (2) with rotary lever (22) is installed on insulating holder (1) with the possibility of rotation. Additionally another rotary body (3) of contact is installed on insulating substrate (1) with parallel contact fingers (9, 10), which accordingly embrace connected fixed contacts (4, 5, 6) on both sides.

EFFECT: invention provides for reliable switching at high currents, and switching with absence of vibrations and electric arc.

3 cl, 8 dwg

Power accumulator // 2394297

FIELD: electrical engineering.

SUBSTANCE: invention relates to power accumulator for step switch operated at load with lengthwise-travel winding slides and lengthwise-travel jumping slides which, when unlocked, repeat the motion of winding slides and convert their translation into rotation of output shaft that actuates loaded step switch. Said jumping slides accommodate two guided rollers arranged in particular-geometry link. Note here that during first part of every stroke of jumping slides only one roller in guided in said link with geometrical tangenting (jointing), while, during second part of stroke, second roller moving free is guided in said link with geometric tangenting, while roller guided previously in said link moves free. Finally, during third part of stroke, roller moves again with geometrical tangenting in said link.

EFFECT: possibility to vary torque at output shaft and to produce high torque that allows reliable reach of final position and repeated interlocking of power accumulator.

5 cl, 4 dwg

Tap switch // 2385514

FIELD: electric engineering.

SUBSTANCE: switch is closed on top with head that comprises head flange, in which driving shaft leading outside is installed. At this head flange there might be an available upper transmission step is arranged, or by means of compatible flange, a flywheel drive is installed without necessity in additional various units, in particular special head of switch.

EFFECT: provision of possibility to implement actuation of insulated switching shaft only with one head of switch, independently on type of drive.

2 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: tap switch (10, 20) designed for electric transformers includes drive mechanism and frame containing at least two elongated pins (11) to which there attached is a number of fixed male contacts located perpendicular in a row thus forming a whole entity. Besides switch consists of a system of moving contacts (14) operating based on friction, which slide along fixed contacts (12) owing to impact of worm (23). In end part of insulating tube (27) a nut thread is made or attached coaxially to worm (23) and outside it so that system of moving contacts (14) is fixed by means of shaped holder (28) in end part of insulating tube (27) opposite nut thread. Thus, nut thread is located in position different from the position of system of moving contacts (14) in relation to total length of switch (10, 20), thus providing use of moving contacts (14) without restrictions of sizes of tube (27) and/or worm (23).

EFFECT: simplifying the design, increasing functionality, reliability and strength, and improving manufacturability.

7 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention is referred to electric engineering and can be used for supplemental reactivity of an arc furnace transformer. Reactive ballast arrangement (V) for the arc furnace consists of a choke coil (1) with an open switch (2) for load increment changing which is suitable for installation of the choke coil (1) reactance under load. Reactive ballast arrangement (V) is connected before the transformer of the arc furnace (O) used, in particular, for steel making.

EFFECT: simplifying and improving accuracy of reactivity installation.

12 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention relates to a manual drive for stepwise control of a step transformer winding tap changer with a locking device, without power consumption. Besides, there is a master shaft, on which per one change there are several manual rotations implemented. There is also a control mechanism, which converts these rotations exactly into one rotation of a geared wheel per one change. The locking mechanism comprises a rotary inner key and a latch rotating around the axis of rotation and a stop, which corresponds to the stop slot of the master shaft, and a stop cam, which corresponds to the slot of the geared wheel of the control mechanism. Due to actuation of the inner key, the latch rotates from the locked position so that the stop and the stop cam are disengaged from the appropriate slots.

EFFECT: higher reliability of protection in respect to undeliberate or deliberate incorrect usage of a manual drive.

7 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: switching module has, at least, comprises, at least, one switch 2A composed of power semiconductor device, cooling appliance 3A of electrically conducting material and current feed appliance 1A abutting switch 2A whereon abuts switch 2A to cool switch 2A. Insulation means 8A is arranged between cooler 3A and current feeder 1A to isolate cooler 3A from current feeder 1A. Switch 2A, cooler 3A, current feeder 1A and insulator 8A are configured to arranged cooler at no potential which allows decreasing length of coolant feed pipes.

EFFECT: compact design.

11 cl, 2 dwg

FIELD: electrical engineering.

SUBSTANCE: invention relates to a transformer winding stages switch with semiconductor switching elements for continuous switching between the two branches (branch n, branch n+1) of winding of a transformer with staged voltage control each winding branch is connected to the common load output via the corresponding mechanical switch (DS) and a series circuit of two oppositely placed IGBTs (IP, In), the circuit linked in series to the mechanical switch. According to the invention, each IGBT is shunted with a corresponding varistor (Vp, Vn), connected in parallel thereto and calculated in a special way.

EFFECT: no need for special setting to corresponding rated current.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: invention relates to the method of breakless switching between two taps (tap n, tap n+1) of a transformer winding with stepped voltage control, besides, each of both winding taps via an appropriate mechanical switch (DS) and a circuit arranged subsequently with it from two opposite IGBT (Ip, In) may be connected with a common loading outlet.

EFFECT: higher functionality.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: drive comprises an AC converter-fed motor (1) with permanent magnets, the output shaft (2) of which is connected to a driving shaft (3) of the OLTC device, a programmable logical controller (4), a unit (5) of power switching of the AC converter-fed motor windings (1) with permanent magnets, a sensor (6) of the switching angle of the AC converter-fed motor windings (1), a sensor (7) of position and speed of the AC converter-fed motor (1) shaft, a control panel (8), a panel (9) of OLTC device position indication, a source (10) of uninterrupted supply. The output of the source (10) is connected to the first input of the controller (4), the second input of the controller (4) is connected to the output of the panel (8), its third input is connected to the output of the device for remote control of the OLTC drive, its fourth input is connected to the first output of the unit (5), its fifth input is connected to the output of the sensor 6, its sixth input is connected to the output of the sensor (7), the first output of the controller (4) is connected to the first input of the unit (5), its second output is connected to the input of the panel (9), its third input is connected to the input of the device for remote control of the OLTC drive, the second input of the unit (5) is connected to the source of supply, its third input is connected to the output of the sensor (6), its fourth input is connected to the output of the sensor (7), its second output is connected to windings of the AC converter-fed motor (1), at the same time the sensor (6) and the sensor (7) are placed on the common axis with the AC converter-fed motor (1).

EFFECT: higher operational reliability of the drive, reduced labour intensiveness in manufacturing, higher accuracy of positioning during regulation.

1 dwg

FIELD: electricity.

SUBSTANCE: diagnostic system includes measuring device for contacts, which has the possibility of determining the contact position. Contact signal generated with the above measuring device indicated whether the contact is open or closed. Time interval is connected to maximum time during which the contact can be in contact position. Controller has the possibility of receiving the contact signal and generating the time interval if closing on the basis of contact signal and comparison of time interval of closing with threshold time interval in order to determine whether the time closing interval exceeds the threshold time interval. Warning message is generated with diagnostic system and indicates the exceedance of threshold time interval.

EFFECT: reducing the damage to equipment when performing the operations and excluding contact carbonisation.

7 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: four-winding three-phase transformer is proposed, three parallel cophased windings of which are made with neutral taps of phases, and six groups of semiconductor diodes connected as a ring, and neutral taps of cophased winding phases are connected to common points between groups of semiconductor diodes in the following sequence: two outputs of phase A, one output of phase C, two outputs of phase B, one output of phase A, two outputs of phase C and one output of phase B, at the same time one of points between semiconductor diodes may be replaced.

EFFECT: reduced dimensions of the device and higher reliability.

3 cl, 1 tbl

FIELD: electricity.

SUBSTANCE: compartment (2) of the electric motor within the on-load tap changer comprises an electric motor module and a control module (12). The module of the electric motor comprises an electric motor (6), a reducer (7) and a position sensor (9), besides, the control module (12) is made with the possibility to control an output shaft (3), which goes out from the compartment (2) of the electric motor, by means of power supply to the electric motor (6) via a direct connection to put the output shaft (3) in motion via a reducer (7), besides, the position sensor (9) is made with the possibility to register motion and positions of the output shaft (3) and to transfer information about such to the control module (12). The compartment (2) of the electric motor in the working condition is tightly closed with the electric motor module and the control module (12), arranged inside such tightly closed volume.

EFFECT: reduced time for production deployment, increased flexibility for making changes into the order at the later stages of its completion, increased convenience of service, reduced cost of the electric motor for the on-load tap changer.

7 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: transformer comprises two parts, the main (1) one and the additional (2) one arranged on a separate triple-rod core with six windings, three primary and three secondary ones, connected in series and in a cophased manner with according windings of the main part. The additional part has a high turn transformation ratio compared to the main part. Capacitors (3) are serially connected in a circuit of its primary windings. The additional part is arranged on a transformer core, which is 10 times less than the main part. Windings of the additional part have 10-16% of turns quantity compared to the appropriate windings of the main part. Smooth contactless self-control of voltage under load is executed without an extraneous effect at the transformer operation and does not required additional automatics or a person's attendance. In an idle run mode there is a rated voltage available at the outlet of the composite transformer, which gradually increases while the load increases. Control may be voltage stabilisation. The additional part dimensions are determined by a selected value of the voltage growth. The additional part may be added to a transformer in operation.

EFFECT: provision of smooth contactless self-control of voltage under load.

3 cl, 3 dwg

FIELD: continuous switching of tap-changing-under-load transformers.

SUBSTANCE: proposed stepping thyristor switch has mechanical stepping selector and load switch. Stepping selector only is disposed in transformer oil tank while load switch incorporating thyristors is mounted in separate case attached to one side wherein it is held in air medium, so that switch thyristors are disposed away from hot transformer oil.

EFFECT: enhanced reliability and service life of switch.

1 cl

Up!