Vacuum circuit breaker with terminal clamps rigidly fixed to buses at both sides. RU patent 2516337.

IPC classes for russian patent Vacuum circuit breaker with terminal clamps rigidly fixed to buses at both sides. RU patent 2516337. (RU 2516337):

H01H33/662 -

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FIELD: electricity.

SUBSTANCE: vacuum circuit breaker contains a vacuum chamber (2) with a switch contact consisting of a fixed contact element that is in contact with a terminal clamp (11) of the fixed contact, as well as a movable contact element and a drive unit (7). A switching mechanism (4) is connected to a drive unit (7) and the movable contact element. Connective means in contact position connect electrically a terminal clamp (13) of the movable contact with the movable contact element. The connective means have a screw terminal (16, 17) consisting of an input screw terminal element (16) connected to an electroconductive section of the switching mechanism (4) and the matching screw terminal element (17) connected rigidly to the vacuum chamber (2) and electrically to the terminal clamp (13), which are located so that the input screw terminal element (16) in result of a driven motion is clamped with the electroconductive section by the matching screw terminal element (17).

EFFECT: manufacturing of a compact circuit breaker which at fast closing speed ensures a reliable pathway for current with high current-carrying capacity between terminals of the vacuum circuit breaker.

10 cl, 1 dwg

The invention relates to the vacuum switch, containing a vacuum chamber, which created a vacuum which is switching contact, with switching contact is still connected to the vacuum camera fixed contact detail, which is in electrical contact with the contact clip fixed contact, and directed mobile relatively fixed contact details sliding contact detail, which is located in the trip position on the distance from a fixed contact details, and in the position of a contact is in contact with a fixed contact item, drive unit to create the drive traffic that is connected with a drive unit and the movable contact detail switching mechanics, which is electrically conductive, passing to the movable contact details, site Explorer, and the connection tool, are in the position of the contact electrically connect the clamp of the rolling contact with the movable contact detail.

This vacuum switch is already known from the practice. Vacuum switches are used, in particular, medium voltage, i.e. in the range voltage between 1 kV and 52 kV. In this voltage range also arise, in particular, switching large capacity electric arc when opening, switching contacts. To extinguish these arcs when current passes through zero, switching contacts are located in the vacuum chamber, which creates a vacuum. According to the technical level, there is connected, as a rule, still with vacuum chamber static contact, and directed movably with regard to him sliding contact. The sliding contact can be made in both rotary contact knife, and the lifting of the contact, which is the opposite of a fixed to a contact in the longitudinal direction and goes mobile in longitudinal direction. To ensure the movement of the moving contact in the longitudinal direction with simultaneous hermetic connection with vacuum chamber, a bellows made of metal, which is connected, on the one hand, with vacuum chamber and, on the other hand, with the movable contact detail. Driving the movement of vacuum circuit breaker is created using the drive unit, which is implemented, for example, in the form of spring drive or magnetic drive. Created by driving unit movement is transmitted through switching mechanics on the sliding contact detail. Switching mechanics contains operative post, which is conducting the plot of land that goes to the movable contact details. For the electrical connection of this conductive part of the operational with connecting rod clamp sliding contact is provided by connecting the means, which are implemented according to the technical level, in the form of contact slides, tape or contact roller contact. As a rule, is used tape to the contact with the purpose of ensuring the possibility of operative movement of the rod. In the position of the contact of the vacuum switch, the current flows from the connection clamp fixed contact through a fixed contact detail, sliding contact detail, electrically conductive part of the operational rods and flexible connection tool to the connecting clamp rolling contact. However, flexible connective tools have the disadvantage that they have compared with the rest of the path of current flow is reduced load capacity on current, so what, in particular, at high currents of short circuit, formed invalid in many cases the application of the resistance. In addition, at high speeds off requires a complex connection technology for flexible connection of funds as at fast off having a large friction force or power curve. Finally, flexible connective tools require very little space.

In addition, the prior art cone contacts. Cone contacts are used, according to the state of the art, in switches with two contact systems. The switch initially closed, for example, cone contact, so cone contact occurs expected the electric arc. The second contact the system is behind a mud first contact system so that it can be closed without the formation of an electric arc. On the basis of its best conductivity, current flows when both contacts are closed, trailing through the second contact system. However, prevents damage second contact system due to the electric arc.

The objective of the invention is to create a vacuum circuit breaker specified in the early type, which is compact and inexpensive and, in particular, at high speeds enable provides reliable path of current flow with high load-carrying capacity on a current between the contact clips vacuum circuit breaker.

This problem is solved, according to the invention, the fact that the connection tool clamping have a contact that is connected with conducting plot switching introductory mechanics clamping contact detail and still connected to a vacuum chamber and electrically contact clip movable contact clamping response contact detail, which are located relative to each other so that the introductory clamp contact detail due to drive traffic clamped with electric conductivity with the response clamping contact detail.

According to the invention, it is proposed vacuum switch, instead of the usual connection funds has screw terminal. On the basis of clamping contact is possible to create a vacuum switch with exclusively fixed connection with tires. So switching mechanics has no contact with conductive plot, roller or sliding contacts with the rapid circuit switching contact can lead to mechanical problems. Therefore, according to the invention, provides quick vacuum circuit breaker.

In addition, the vacuum circuit breaker is also compact, and can be used without problems in small spaces installation. According to the invention, screw terminal has two contact details. Response clamp contact detail clamping contact mechanically still connected with connecting clamp rolling contact, and thus is still in place. The second contact detail clamping contact, namely, input clamp contact detail, is still on switching mechanics, with between electrically conductive site Explorer and input clamp contact detail ensures electrical connection. Thus, mobile contact detail electrically connected also with the opening clamping contact detail. At the latest when the input switching movement in switching mechanics, electricity connection between introductory clamping contact item and return the clamping pin detail and thus the electrical connection between the movable contact detail and contact clip movable contact details. According to the invention, eliminates the need for a flexible connective tools.

Preferably, screw terminal ahead of time switching contact with the closure of vacuum circuit breaker. According to this preferred modification provided that the outside of the vacuum chamber is not an electric arc. Appropriate, an introductory clamp contact detail connected with switching mechanics so that when clamping contact details clamping contact hampered mobile contact detail. Therefore, according to this expedient modification of an invention, a shot in the movable contact item is less strong.

According to one of the preferred option of carrying out the invention drive unit is pyrotechnic power element and provides a path ignition to bring into action pyrotechnic force element. Pyrotechnic power components provide the ability rapid vacuum circuit breaker. In addition, due to the ignition of pyrotechnic force element are large forces include with strong subsequent blow mobile contact details. In the framework of the invention may also be jammed switching contact due to the large forces of impact. Therefore, the vacuum breaker can be only once, and then it must be replaced.

According to one suitable in this regard, modification, pyrotechnic drive has a sliding element that due to the initiation instantly shifts on the part of the path. While switching mechanics is realized in the form of passing in the longitudinal direction and combined with the shifting element operational rods, with a sliding element to initiate pyrotechnic drive is designed for holding the movable contact details of her trip position. According to this appropriate modifications, switching contact is made in the form of so-called lifting contact. In other words, the sliding contact is held at the end of serving a vacuum chamber operational rods. Thus the mobile contact detail lies opposite fixed contact details in the longitudinal direction in which the task bar. On the opposite mobile contact details of the end of the operational rod focused pyrotechnic drive, while the operational arm mechanically connected with the moving element that made for example in the form of the pin and is aligned with the operational arm. Pyrotechnic drive is oriented so that when the ignition pyrotechnic shear force element the element moves in longitudinal direction to still contact. On the basis of rigid connection between a sliding element and the movable contact detail using hot rod shift movable contact details in the direction of the fixed contact details. At the same time introductory clamp contact detail pressed in response clamping contact detail, which closes the path of current flow between the contact clips vacuum circuit breaker. Before ignition pyrotechnic shear force element the element provides the detaining force that counteracts circuit switching contact. On the basis of the difference of pressure in the vacuum chamber and the outer atmosphere acts of continuous closing force that presses the movable contact item to still contact details. This counteracts the detaining power sliding element.

According to one preferred in this respect, modification, provided by positioning tools to install the spatial position of the moving element and thereby distance movable contact details on fixed contact details. Such positioning means are, for example, a simple positioning screws with which help it is possible to change the position of the pyrotechnic drive unit and thus shifting element in the overall retention frame.

According to one of the preferred option of carrying out the invention screw terminal is tapered contact that has tapered introductory clamping contact detail, and also complementary with her on form response clamping contact detail. Introductory clamp contact detail is, for example, mounted on cylindrical switching rod ring, which increases continuously circumference, the opposite movement switch, so that creates a wedge-shaped in cross-section introductory clamp contact detail, through concentric hollow space which is operational arm. According to one of the preferred option run, input clamp contact detail is freely on online rod, while the switch is formed place clamp introductory clamping contact details on the prompt bar. However, in deviation from this introductory clamp contact item can be also still connected with the operational arm, for example, with the help of clamping tools, welding, screwing or hot pressing.

According to one preferred modification, input clamp contact detail already in the trip position freely adjacent to the clamping response contact details. This ensures that screw terminal in any case ahead of time switching contact.

Preferably, fixed contact detail is kept passing through the wall of the vacuum chamber of the post of a current collector, which from the outside of the vacuum chamber at least mechanically connected with restraint means for support of vacuum circuit breaker and at least electrically contact means, which are galvanically connected with the contact clip fixed contact, with means of restraint on after contact funds relative to the fixed contact details. According to this preferred modifications are prevented eddy currents that occur otherwise.

Fig. an example of a complete vacuum circuit breaker, according to the invention, in the section.

The figure shows in the context of the example running the vacuum switch 1, according to the invention. Vacuum switch is not shown in the figure switching contact in the vacuum chamber 2. Switching vacuum chamber has ceramic tube that passes between contacts and acts as an insulator. In the vacuum chamber acts 2 finger 3 fixed contact, which is on its located in the vacuum chamber 2, the end is not depicted fixed contact detail. In a longitudinal direction opposite to the fixed contact details lies mobile contact item that is installed on the free end of the operational rod 4, which forms switching mechanics vacuum circuit breaker 1. At its opposite mobile contact details of the end of the 5 operational 6 bar still connected with moving item 6 pyrotechnic drive 7. For holding pyrotechnic drive 7 is not depicted holding frame. Position 8 schematic outline of e-assessment scheme of the control unit. For mechanical connection pole vacuum circuit breaker is holding strap 18, which runs between pole pieces and consists of an insulating material, for example, from glass fiber reinforced plastic. In addition, the vacuum chamber 2, and 3 finger fixed contact with restraint devices 9 are also still relatively supporting frame 8. Additionally, the contact tool 10 provides the electrical connection fixed contact your finger 3 and thus fixed contact details with contact clip 11 fixed contact.

Operational rod 4 made in the illustrated embodiment fully conductive. Screw terminal 12 is used for electrical connections operational rod 4 and thus not represented in the mobile contact details with rigidly connected to the bus contact clip 13 rolling contact. For mobile in longitudinal direction and at the same time tight connection RAM rod 4 with vacuum chamber 2 is shown only sketchy metal bellows 14. Screw terminal 12 contains an introduction to the clamping pin item 16, as well as having a complementary form of response clamping contact item 17. Introductory clamp contact item 16 is supplied with a cone shape, so in the context it has the form of wedge.

Shown in figure vacuum camera 2 used to bypass submodule Converter valve, which is consistent monotonous made bipolar submodules. In case of refusal of one of the submodule experiencing high currents of short circuit in the submodule with the formation of an electric arc. To prevent this, the electric arc and to save work Converter valve with no invalid closed submodules vacuum switch 1. To do this, first measured short circuit current use is not shown sensors located in parallel to the vacuum switch 1 submodule. Along with the current in the submodule shock can also be measured voltage and submit to the specified control unit. If this is specified in a control block criterion short circuits, the control unit sends a signal plugs in pyrotechnic power element 7. Is explosive shift shift item 7 and thus operational rod 4. This operational rod 4 shifts in the direction of the arrow 15, i.e. in the longitudinal direction. Due to switching movement is also stationary clamping introductory clamping contact details with the response clamping contact detail, providing electrical contact. Contact movable contact details with a fixed contact item closes the path of current flow between the contact clip 11 sliding contact and contact clip 13 fixed contact.

1. Vacuum switch containing - vacuum chamber (2), which created a vacuum which is switching contact, with switching contact is still connected to a vacuum chamber (2) fixed contact detail, which is electrical contact with the contact clip (11) fixed contact, and directed mobile relatively fixed contact details sliding contact detail, which is located in the trip position on the distance from a fixed contact details, and in the position of a contact is contact with fixed contact detail - drive unit (7) to create the drive of motion, is joined with the drive unit (7) and the movable contact detail switching mechanics (4), which is conducting the site Explorer, going to the rolling contact details, and - connecting means that the position of the contact electrically connect the clamp (13) of the rolling contact with the movable contact detail, wherein the connection tool have screw terminal (16, 17), which is connected with conductive switching plot mechanics (4) of the introductory clamping contact item (16) and still connected to a vacuum chamber (2) and electrically with contact clip (13) of the rolling contact clamping response contact item (17), which are located relative to each other so that the introductory clamp contact item (16) due to drive traffic clamped with electric conductivity with the response clamping contact item (17).

2. Vacuum switch in claim 1, characterized in that the screw terminal (16, 17) ahead of time switching contact with the closure of the vacuum switch (1).

3. Vacuum switch according to claim 2, characterized in that the drive unit has pyrotechnic force element (7) and starter circuit to activate pyrotechnic force element (7).

4. Vacuum switch according to claim 3, wherein the pyrotechnic drive has a sliding element (6)that due to the initiation instantly shifts on the part of the path, and that switching mechanics is realized in the form of passing in the longitudinal direction and is connected with the moving element (6) operational rods (4), with a sliding element (6) prior to the initiation of pyrotechnic drive (7) is intended to hold the movable contact details of her trip position.

5. Vacuum switch according to claim 4, wherein provided by positioning tools to install the spatial position of the moving element (6) and thus the distance movable contact details on fixed contact details.

6. Vacuum switch on any one of claims 1 to 5, wherein the screw terminal (16, 17) is the cone contact and has tapered introductory clamping contact item (16), as well as complementary with her on form response clamping contact item (17).

7. Vacuum switch of claim 6, wherein the introductory clamp contact item (16) already in the trip position freely adjacent to the clamping response contact details (17).

8. Vacuum switch on any one of claims 1 to 5, wherein fixed contact detail is held passing through the wall of the vacuum chamber (2) finger (3) fixed contact, which is outside of the vacuum chamber at least mechanically connected with restraint means (9) to support the vacuum switch (1) and at least electrically contact means (10)that galvanically connected with the contact clamp (11) fixed contact, with means of restraint connected after contact funds (10) relative to the fixed contact details.

9. The Converter valve to convert electrical current or voltage, containing consecutive circuit bipolar submodules, with each submodule has at least one energy storage and power semiconductor scheme, which allows the creation of falling energy accumulator voltage or zero voltage on terminals the corresponding submodule, and at the same time every submodule agreed shunt means to bypass submodule in case of malfunction, wherein shunt funds have vacuum switch (1) on any one of claims 1 to 5.

10. The Converter valve of claim 9, wherein the powerful semiconductor scheme is designed to create the voltage at the terminals of each submodule, which is the inverse regarding the incident on the energy accumulator voltage.