Tap changer

FIELD: electricity.

SUBSTANCE: invention relates to tap changer, in which moving contact is turned for selective connection with multiple taps. Changer comprises top moving contact made with possibility to turn; bottom moving contact made with possibility to turn and electrically connected with top moving contact; drive shaft turning top moving contact and bottom moving contact together; single fixed contact including single terminal connected to any of multiple taps; and double fixed contact including first terminal and second terminal connected to the other of multiple taps.

EFFECT: reducing number of components and device volume, which operation can be eased by simultaneous turn of top and bottom moving contacts by means of single drive shaft.

7 cl, 13 dwg

 



 

Same patents:

FIELD: electricity.

SUBSTANCE: application: in electrical engineering. According to the method during routine switching at power facilities positions of switching devices are indentified, the above positions are transmitted through a radio channel, the Boolean expression is formed for each switching device and power supply is fed to a block lock of the switching device drive at a true value of the Boolean expression. At that data about the position of the functionally related switching devices are accumulated at locations of their drives at local points, data transfer from the local point is made only with a request of the control room, permit for power supply delivery to the block lock is transmitted from the control room through the radio channel, whereat power supply of the block locks is made from in-built self-contained sources.

EFFECT: increasing the operational reliability of the magnetic lock and reducing costs for installation, start-up and commissioning.

1 dwg

FIELD: electricity.

SUBSTANCE: switch comprises selector to select winding tap to be reswitched and load switch with at least one tap of current circuit and at least two auxiliary current taps; in each of them in load switch operating both with vacuum circuit breakers and switching cells, besides selector contacts, there are auxiliary switches connected in series with them and the respective winding tap, and in stationary mode the above auxiliary switches perform complete galvanic interruption of vacuum circuit breakers.

EFFECT: providing required dielectric strength to the load switch without increase in dimensions of vacuum circuit breakers.

5 cl, 3 dwg

Tap changer // 2553462

FIELD: electricity.

SUBSTANCE: tap changer with semiconductor switching elements is intended for uninterrupted changing between winding taps of a step transformer; it is made as a hybrid switch comprising fixed mechanical contact fingers and opposed contacts installed at a movable contact bracket. Semiconductor switchover units are intended for load transfer, they are switched by means of contacts at the contact bracket when load is transferred in a specified switching sequence.

EFFECT: development of the tap changer featured by the simple design and high operational reliability, which can be used for switching of different step transformers without forced special-purpose matching to the transformer.

4 cl, 7 dwg

FIELD: electricity.

SUBSTANCE: invention relates to the method of detecting of malfunction of the vacuum breaker in a live tap changer in which the tap changer contains a housing filled with oil, a diverter switch comprising a mobile contact (MC, RC) and, at least, one vacuum breaker (MVI, RVI) designed with a possibility of interruption of the current passing through the mobile contact of the diverter switch. The method includes the repeating stages during which the content of hydrogen in oil is determined and the existence of malfunction of the vacuum breaker (MVI, RVI) is identified on the basis of measurement of the content of hydrogen in oil.

EFFECT: decrease of risk of false identification of malfunction with an immediate emergency shutdown of the transformer.

11 cl, 9 dwg

FIELD: machine building.

SUBSTANCE: invention refers to a drive mechanism. A drive mechanism for a medium voltage fuse switch comprises a base plate (10) and a front plate (11) which form an inner space enveloping a working shaft and a driving shaft set coaxially along the first longitudinal axis, the driving shaft is functionally coupled with a kinematic circuit of the medium voltage fuse switch, the working shaft (20) is fitted by a head connected to an operating handle for manual actuation of the working shaft, a spring unit consisting of two spiral springs having the first end functionally coupled with the working shaft, a clamping unit consisting of two clamping tabs set on the driving shaft, the first (61) and the second (62) unclamping units to unclamp the driving shaft and provide for its rotation. The first unclamping unit (61) provides for the rotation of the driving shaft in the direction opposite to the second unclamping unit (62).

EFFECT: reduced manufacturing, mounting and operational costs.

11 cl, 8 dwg

FIELD: electricity.

SUBSTANCE: invention is related to an on-load tap charger with semiconductor switching elements for uninterrupted switching between fixed contacts of the tap charger which are connected electrically to the tapped winding of the tapped transformer. Each of the fixed contacts of the tap charger can be connected to the device for charging either directly or through interconnected semiconductor switching elements. According to the invention the tap charger has separated and fixed tapping contacts for electric insulation of the semiconductor switching elements from the transformer winding during the static mode of operation.

EFFECT: excluding high load of switching elements and guaranteeing electrical separation of the tap charger from the transformer winding in the static mode of operation.

9 cl, 3 dwg

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

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: switch comprises selector to select winding tap to be reswitched and load switch with at least one tap of current circuit and at least two auxiliary current taps; in each of them in load switch operating both with vacuum circuit breakers and switching cells, besides selector contacts, there are auxiliary switches connected in series with them and the respective winding tap, and in stationary mode the above auxiliary switches perform complete galvanic interruption of vacuum circuit breakers.

EFFECT: providing required dielectric strength to the load switch without increase in dimensions of vacuum circuit breakers.

5 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention suggests energy accumulator with offsetting mechanism and on-load regulator comprising energy accumulator having simple and inexpensive construction, which may suppress load moment to ensure stable operation. Offsetting mechanism in-built to energy accumulator comprises protruding part 8, thrust 9 and offsetting camp 17. The protruding part is fixed to the bottom part of eccentric cam 2. Thrust 9 is fixed to the end of protruding part 8. Offsetting camp 17 is shaped as isosceles triangle giving apex angle equal in essence to 90 degrees and fixed to the top part of body part 5 that accumulates energy. Offsetting camp 17 coming in contact with thrust 9 through accumulated energy of body part 5 makes crank 6 rotating and moves latch 7 to stand-by position.

EFFECT: improved stability with simultaneous suppression of load moment.

4 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: in transformer winding taps switching unit the transformer is made with two branches of the split winding with low- and high-voltage taps, thyristors are joined into two valve groups with opposite conductivity directions and interconnected by two outputs, with a phase lead of the supply circuit. The valve group with one conductivity direction is coupled but its other outputs to taps of one branch of the split winding while the valve group with opposite conductivity direction is coupled to the other branch of the split winding.

EFFECT: ensuring voltage regulation under load, reducing value of switching extra currents of the transformer winding control stage.

1 dwg

FIELD: electricity.

SUBSTANCE: invention is related to an on-load tap charger with semiconductor switching elements for uninterrupted switching between fixed contacts of the tap charger which are connected electrically to the tapped winding of the tapped transformer. Each of the fixed contacts of the tap charger can be connected to the device for charging either directly or through interconnected semiconductor switching elements. According to the invention the tap charger has separated and fixed tapping contacts for electric insulation of the semiconductor switching elements from the transformer winding during the static mode of operation.

EFFECT: excluding high load of switching elements and guaranteeing electrical separation of the tap charger from the transformer winding in the static mode of operation.

9 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention is related to electrical engineering and can be used in distributing mains in order to decrease voltage fluctuations. The transformer contains a stepping switch on the basis of one or several mechanical switches. At switching current is directed through semiconductor switches in order to ensure uninterrupted operation.

EFFECT: simplification of design.

11 cl, 2 dwg

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

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: 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

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