CN203070999U - V-shaped series-structure ultrahigh-voltage vacuum circuit breaker - Google Patents

Abstract

The utility model relates to a V-shaped series-structure ultrahigh-voltage vacuum circuit breaker which comprises two vacuum circuit breakers, equalizing capacitors, a connector, an insulating support, a steel bracket, an optical fiber, a high-voltage side controller, a circuit breaker inlet wire, a circuit breaker outlet wire, an outdoor case and a V-shaped series-structure whole machine controller. The V-shaped series-structure ultrahigh-voltage vacuum circuit breaker is characterized in that the two vacuum circuit breakers are connected in series into a V-shaped structure, the voltage of each single vacuum circuit breaker is 126kV, and the voltage of the whole circuit breaker machine is increased to 252kV after the vacuum circuit breakers are connected in series; and the equalizing capacitors are adopted to equalize the voltages of the two vacuum circuit breakers so that the withstand voltage value of a fracture of each single vacuum circuit breaker is equalized, and the V-shaped series structure can reduce the impact of pollution on the equalizing capacitance value. The structure makes a vacuum circuit breaker achieve the level of an ultrahigh-voltage vacuum circuit breaker.

Description

A V-type series structure ultra-high voltage vacuum circuit breaker

technical field

The utility model relates to an ultra-high voltage vacuum circuit breaker with a V-shaped series structure, which belongs to the technical field of high-voltage electrical appliances.

Background technique

With the rapid increase of my country's electricity load and the large span of my country's supply and demand positions, the high-voltage transmission lines and transmission levels of the State Grid have been further improved in recent years, which has led to a sharp increase in the demand for high-voltage circuit breaker equipment. At the same time, the stability of high-voltage circuit breakers Operational and environmental protection requirements have also increased. At present, the insulation medium of high-voltage and extra-high-voltage circuit breakers in _the power grid mainly uses SF ₆ , which is one of the gases that cause greenhouse effects. With global warming, human beings' awareness of environmental protection is gradually increasing, and the signing of the Kyoto Protocol, the switch industry all over the world is looking for an insulating medium with excellent insulation performance and environmental protection to replace SF ₆ .

At present, a large number of vacuum-insulated medium-voltage vacuum circuit breakers used in the power grid have good operating results, indicating that vacuum is an excellent insulating medium, but vacuum is mainly used in the medium-voltage field, and the vacuum medium is used in high-voltage and extra-high voltage circuit breakers to replace SF ₆ insulating medium will be of great significance. The research shows that the pressure resistance of the vacuum medium presents a certain saturation characteristic at a large opening distance, and the vacuum has the characteristics of excellent short-gap insulation. Therefore, the vacuum short-gap series connection can improve the insulation withstand voltage level. The vacuum interrupter is an important component of the vacuum circuit breaker. The single vacuum interrupter that has been put into power grid operation is 72.5kV, and the highest voltage of the developed single interrupter can reach 126kV. The voltage application of the vacuum medium is further promoted to the ultra-high voltage circuit breaker.

In view of this, the utility model provides an ultra-high voltage vacuum circuit breaker with a V-shaped series structure to meet the needs of industrial applications.

Contents of the invention

The purpose of the utility model is to apply the vacuum insulating medium to the ultra-high voltage circuit breaker, so as to realize the environmental protection of the circuit breaker and reduce the greenhouse effect.

The technical solution of the utility model is: a V-type series structure ultra-high voltage vacuum circuit breaker, including two vacuum circuit breakers, voltage equalizing capacitors, connectors, insulating pillars, steel brackets, optical fibers, high-voltage end controllers, circuit breakers Incoming line, circuit breaker outgoing line, outdoor chassis, V-shaped series structure controller, which is characterized in that two vacuum circuit breakers are connected in series using V-shaped structure, and the single vacuum circuit breaker is 126kV. The voltage level reaches 252kV; a voltage equalizing capacitor is used to equalize the voltage of the two vacuum circuit breakers, so that the fracture withstand voltage value of a single vacuum circuit breaker is evenly divided, and the series connection of the V-shaped structure can reduce the influence of pollution on the equalizing capacitor value.

The above-mentioned V-type series structure ultra-high voltage vacuum circuit breaker is characterized in that the high-voltage end controller sends and receives opening and closing commands with the V-type series structure controller through an optical fiber, and the series structure controller simultaneously controls the three The phase vacuum circuit breaker can control multiple vacuum circuit breakers of the same structure in the substation through expansion.

The above-mentioned V-type series structure ultra-high voltage vacuum circuit breaker is characterized in that the optical fiber is pre-embedded in the inner wall of the insulating support, and is spirally arranged inside the insulating support, and the insulating support is then poured and sealed with epoxy resin, which can Realize the isolation of high and low potentials, so that the vacuum circuit breaker controller at the high voltage end is electrically isolated from the controller of the whole machine in series structure.

The above-mentioned V-type series structure ultra-high voltage vacuum circuit breaker is characterized in that the V-type series structure controller can realize the control of multiple circuit breakers, and only need to increase the number of optical fibers to realize multiple vacuum circuits. Circuit breaker control.

The above-mentioned V-shaped series structure ultra-high voltage vacuum circuit breaker is characterized in that the interior of a single vacuum circuit breaker is a permanent magnet operating mechanism, which can ensure that the dispersion of the opening and closing time of a single vacuum circuit breaker is very small. The time delay of a single vacuum circuit breaker enables multiple circuit breakers to be disconnected synchronously at the same time, which improves the breaking capacity of the circuit breaker and can be used as a phase selection circuit breaker.

The beneficial effects of the utility model are: (1) two vacuum circuit breakers are connected in series using a V-shaped structure, a single vacuum circuit breaker is 126kV, and the voltage level of the circuit breaker of the whole machine is increased to 252kV after series connection; (2) a voltage equalizing capacitor is used Equalize the voltage of two vacuum circuit breakers, so that the fracture withstand voltage value of a single vacuum circuit breaker is evenly divided, and the V-shaped structure series connection can reduce the influence of pollution on the voltage equalization capacitance; (3) The vacuum circuit breaker reaches 252kV after series connection. The signal transmission of the controller at low potential, high potential and low potential is realized through optical fiber. At the same time, the optical fiber has good insulation performance, which can well isolate high and low potential and avoid signal interference. (4) The whole series vacuum circuit breaker supports the high potential through the insulating pillar, the optical fiber is pre-embedded in the inner wall of the insulating pillar, and arranged inside the insulating pillar through a spiral, and the insulating pillar is poured and sealed with epoxy resin, which can realize high and low potential (5) The V-type series structure controller can realize the control of multiple circuit breakers, and only need to increase the number of optical fibers to realize the control of multiple vacuum circuit breakers; (6) Inside a single vacuum circuit breaker It is a permanent magnet operating mechanism, which can ensure that the dispersion of the opening and closing time of a single vacuum circuit breaker module is very small. By setting the delay of each individual vacuum circuit breaker module, multiple circuit breakers are synchronously opened and closed at the same time, and the circuit breaker is improved. The breaking capacity can be used as a phase selection circuit breaker.

Description of drawings

Fig. 1 is a schematic structural diagram of a V-shaped series structure ultra-high voltage vacuum circuit breaker according to an embodiment of the present invention. the

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

Explanation of the marks in Figure 1: 1—vacuum circuit breaker, 2—voltage equalizing capacitor, 3—connector, 4—insulation pillar, 5—steel bracket, 6—optical fiber, 7—high voltage end controller, 8—circuit breaker inlet Line, 9—circuit breaker outlet, 10—outdoor chassis, 11—the controller of the whole machine with V-type series structure.

Take a 252kV ultra-high voltage vacuum circuit breaker with a V-shaped series structure as an example. The circuit breaker mainly breaks the short-circuit current through the arc extinguishing chamber. The arc extinguishing chamber of the vacuum circuit breaker is a vacuum insulating medium. The single vacuum circuit breaker in this example is 126kV, multiple vacuum circuit breakers 1 are connected in series using a V-shaped structure, and after series connection, the overall voltage level of the circuit breaker is increased to 252kV. The voltage equalization capacitor 2 is used to equalize the voltage of the two vacuum circuit breakers, so that the fracture withstand voltage value of a single vacuum circuit breaker is evenly divided to avoid re-ignition breakdown. Pressure equalization failed.

The 252kV ultra-high voltage vacuum circuit breaker with V-shaped series structure adopts a bistable permanent magnet mechanism. The opening and closing of the permanent magnet mechanism drives the moving guide rod to realize the opening and closing. The current in the opening and closing coil is provided by the discharge of the capacitor. . The energy of the capacitor obtains current through the high potential to charge the capacitor, and the entire permanent magnet mechanism and control circuit are inside a single vacuum circuit breaker at high potential. After being connected in series, the controller of the vacuum circuit breaker can reach 252kV. The signal transmission of low potential, high potential and low potential is realized through optical fiber. At the same time, the optical fiber has good insulation performance, which can well isolate high and low potentials and avoid signal interference.

The series vacuum circuit breaker supports the high potential through the insulating pillar, the optical fiber is pre-embedded in the inner wall of the insulating pillar, and arranged inside the insulating pillar through a spiral, and the insulating pillar is poured and sealed with epoxy resin, which can realize the isolation of high and low potentials, Connect the built-in controller of the high-voltage vacuum circuit breaker to the controller of the series vacuum circuit breaker for control, and send the opening and closing commands to the built-in controller of the high-voltage vacuum circuit breaker through the low-potential series controller of the vacuum circuit breaker. Opening and closing operation, the optical fiber solves the high and low potential isolation.

The whole machine controller of the vacuum circuit breaker in series can realize the control of multiple circuit breakers, and the control of multiple vacuum circuit breakers can be realized only by increasing the number of optical fibers; the interior of a single vacuum circuit breaker is a permanent magnet operating mechanism, which can ensure The dispersion of the opening and closing time of a single vacuum circuit breaker module is very small. By setting the delay of each individual vacuum circuit breaker module, multiple circuit breakers are synchronously opened and closed at the same time, which improves the breaking capacity of the circuit breaker and can be used as a phase selection circuit breaker used.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (5)

1. the EHV Vacuum Breaker of a V-type cascaded structure, comprise two vacuum circuit-breakers (1), equalizing capacitor (2), connector (3), insulation column (4), steel bracket (5), optical fiber (6), high-pressure side controller (7), circuit breaker inlet wire (8), circuit breaker outlet (9), outdoor crate (10), V-type cascaded structure complete machine controller (11), it is characterized in that, utilize the V-structure series connection by two vacuum circuit-breakers (1), single vacuum circuit-breaker (1) is 126kV, and the voltage levvl that the complete machine circuit breaker is improved in the series connection back reaches 252kV; Adopt equalizing capacitor (2) that two vacuum circuit-breakers (1) are all pressed, single vacuum circuit-breaker (1) fracture withstand voltage is divided equally, the V-structure series connection can reduce filthy influence to the equalizing capacitance value.

2. the EHV Vacuum Breaker of V-type cascaded structure according to claim 1, it is characterized in that, high-pressure side controller (7) is received and dispatched the divide-shut brake order by optical fiber (6) and V-type cascaded structure complete machine controller (11), cascaded structure complete machine controller (11) is controlled three-phase vacuum breaker simultaneously, can control many isostructural vacuum circuit-breakers in the transformer station by expansion.

3. the EHV Vacuum Breaker of V-type cascaded structure according to claim 1, it is characterized in that, optical fiber (6) is imbedded insulation column (4) inwall in advance, and by spiral insulation column (4) inside that is arranged in, insulation column (4) is poured into a mould embedding by epoxy resin again, the isolation of high electronegative potential be can realize, high-pressure side vacuum circuit-breaker controller and cascaded structure complete machine controller electrical isolation made.

4. the EHV Vacuum Breaker of V-type cascaded structure according to claim 1, it is characterized in that, V-type cascaded structure complete machine controller (11) can be realized the control of many circuit breakers, only needs to increase the way of optical fiber (6), can realize the control of a plurality of vacuum circuit-breakers.

5. the EHV Vacuum Breaker of V-type cascaded structure according to claim 1, it is characterized in that, single vacuum circuit-breaker (1) inside is permanent-magnet manipulating mechanism, the dispersiveness that can guarantee single vacuum circuit-breaker (1) branch wire time is very little, make a plurality of circuit breakers synchronous switching off at one time by the time-delay that each single vacuum circuit-breaker (1) is set, improve the connecting-disconnecting function of circuit breaker, can be used as and select the phase circuit breaker to use.

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