CN104966648A - Indoor 110kV vacuum circuit breaker body formed by common-pole series-connected breakers in different voltage classes - Google Patents

Abstract

An indoor 110kV vacuum circuit breaker body with common pole type circuit breakers of different voltage levels connected in series, including 72.5kV vacuum circuit breaker, 40.5kV vacuum circuit breaker, integrated solid-sealed pole and circuit breaker controller arranged front and rear, 72.5kV The vacuum circuit breaker and the 40.5kV vacuum circuit breaker are sealed together by an integrated solid-sealed pole before and after, and the low-voltage side of the 72.5kV vacuum circuit breaker and the high-voltage side of the 40.5kV vacuum circuit breaker are arranged inside the integrated solid-sealed pole. Connected in series through soft connection; the front and rear of the one-piece solid-sealed pole are equipped with an upper outlet seat and a lower outlet seat. The lower outlet seat is connected to the lower contact arm, and the lower contact arm is connected to the plum blossom contact on the low-voltage side as the access point of the low-voltage outlet. The invention makes full use of the breaking and withstand voltage capabilities of the vacuum circuit breaker module, cancels the voltage equalizing capacitor that needs to be installed in the series structure, and effectively avoids the problem of asynchronous action of the series-parallel modular circuit breaker mechanism.

Description

An indoor 110kV vacuum circuit breaker body in which common-pole column circuit breakers of different voltage levels are connected in series

technical field

The invention belongs to the technical field of high-voltage electrical appliances, and in particular relates to an indoor 110kV vacuum circuit breaker body in which common pole type circuit breakers of different voltage levels are connected in series.

Background technique

At present, vacuum main circuit breakers are used in the medium voltage field. The highest voltage level of indoor group cabinet vacuum circuit breakers can only reach 40.5kV. How to realize the miniaturization and indoorization of 110kV vacuum circuit breaker has always been a difficult problem. And the existing 110kV vacuum circuit breaker research or products are limited to the vacuum circuit breaker modules of the same voltage level combined in series and parallel to achieve a higher voltage level, and parallel voltage equalizing capacitors are required between series modules. And the non-synchronization of the actions of different modules has always affected the effect of phase selection control.

Aiming at the current typical 72.5kV vacuum circuit breaker module and 40.5kV vacuum circuit breaker module structure on the market, the series combination voltage distribution simulation and experimental research are carried out. The research results show that the voltage division ratio of the modules tends to be consistent under different combination arrangement conditions, and the static voltage ratio of the high-voltage side module and the low-voltage side module is close to 7:3. And the 1min power frequency withstand voltage of the 72.5kV vacuum circuit breaker module shall not be lower than 160kV. 40.5kV vacuum circuit breaker module 1min power frequency withstand voltage shall not be lower than 95kV. That is, the 72.5kV vacuum circuit breaker module can withstand 110kV voltage for a short time.

Contents of the invention

The technical problem to be solved by the present invention is to provide an indoor 110kV vacuum circuit breaker body in which common pole type circuit breakers of different voltage levels are connected in series to make full use of the vacuum circuit breaker The breaking and withstand voltage capability of the module eliminates the voltage equalizing capacitor that needs to be installed in the series structure, effectively avoiding the problem of asynchronous movement of the series-parallel modular circuit breaker mechanism. The series connection of 72.5kV vacuum circuit breaker and 40.5kV vacuum circuit breaker is realized by adopting front and back arrangement of integrated solid-sealed poles, which solves the disadvantage of large volume of 110kV vacuum circuit breaker. It provides a new idea for realizing indoor 110kV vacuum circuit breaker.

The technical scheme that the present invention adopts for solving the problems of the technologies described above is:

An indoor 110kV vacuum circuit breaker body with common pole type circuit breakers of different voltage levels connected in series, including a 72.5kV vacuum circuit breaker, a 40.5kV vacuum circuit breaker, integrated solid-sealed poles arranged front and rear, and a circuit breaker controller. The 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker are sealed together by arranging integrated solid-sealed poles front and rear. The inside of the column is connected in series through a soft connection; the upper end of the integrated solid-sealed pole with front and rear arrangement is equipped with an upper outlet seat, and the lower end is equipped with a lower outlet seat. The high-voltage incoming line access point, the lower outgoing line seat is connected to the lower contact arm, and the lower contact arm is connected to the plum blossom contact on the low-voltage side as the low-voltage outgoing line access point; the circuit breaker controller is installed on the lower side of the integrated solid-sealed pole arranged front and rear.

According to the above scheme, the 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker inside the integrated solid-sealed pole are arranged front and rear, and connected in series to form a 110kV vacuum circuit breaker.

According to the above scheme, the 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker are both permanent magnet operating mechanisms, and are equipped with insulating pull rods inside (the insulating pull rods realize the isolation of strong and weak currents).

According to the above scheme, the whole circuit breaker body adopts indoor cabinet layout, which is a 110kV vacuum circuit breaker for indoor use.

The working principle of the present invention: the circuit breaker controller is used to realize the asynchronous control of the action of the 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker, and can combine the current and voltage signals obtained by sampling to realize the phase selection control of a single circuit breaker. The circuit breaker action mode includes: when the circuit breaker controller receives the opening command, it first sends the opening signal to the driving circuit of the 72.5kV vacuum circuit breaker mechanism, and then sends the opening signal to the driving circuit of the 40.5kV vacuum circuit breaker mechanism after a certain delay. Switching signal to ensure that the contacts of the 72.5kV vacuum circuit breaker are separated first; when the circuit breaker controller receives the closing command, it first sends a closing signal to the drive circuit of the 40.5kV vacuum circuit breaker mechanism, and then sends a closing signal to the 72.5kV vacuum circuit breaker after a certain delay. The driving circuit of the vacuum circuit breaker mechanism sends a closing signal to ensure that the contacts of the 40.5kV vacuum circuit breaker are closed first.

The delay for the circuit breaker controller to send the opening command to the operating mechanism of the 72.5kV vacuum circuit breaker and the operating mechanism of the 40.5kV vacuum circuit breaker is: the inherent opening time of the 72.5kV vacuum circuit breaker minus the permanent magnet of the circuit breaker Mechanism Action Dispersion Threshold. The delay for the circuit breaker controller to send the closing command to the drive circuit of the 72.5kV vacuum circuit breaker mechanism and the drive circuit of the 40.5kV vacuum circuit breaker mechanism is: the inherent closing time of the 40.5kV vacuum circuit breaker minus the action of the permanent magnet mechanism of the circuit breaker Dispersion Threshold.

The beneficial effects of the present invention are: making full use of the breaking and withstand voltage capabilities of the vacuum circuit breaker module, canceling the voltage equalizing capacitors that need to be installed in the series structure, and effectively avoiding the problem of asynchronous movement of the series-parallel modular circuit breaker mechanism; The type solid-sealed pole realizes the series connection of 72.5kV vacuum circuit breaker and 40.5kV vacuum circuit breaker, solves the disadvantage of large volume of 110kV vacuum circuit breaker, and provides a new idea for the realization of indoor 110kV vacuum circuit breaker.

Description of drawings

Fig. 1 is a schematic diagram of the single-phase structure of the circuit breaker body of the present invention;

Fig. 2 is a schematic diagram of the structure of the integrated solid-sealed pole arranged front and rear in Fig. 1;

Fig. 3 is a schematic diagram of series connection of modules of different voltage levels in the pole of the circuit breaker of the present invention;

In the figure, 1-72.5kV vacuum circuit breaker, 2-40.5kV vacuum circuit breaker, 3-integrated solid-sealed poles arranged front and rear, 31-upper outlet seat, 32-bottom outlet seat, 33-upper contact arm, 34- The lower contact arm, 35-the plum blossom contact on the high voltage side, 36-the plum blossom contact on the low voltage side, 4-the circuit breaker controller.

Detailed ways

The present invention will be described in further detail below based on specific embodiments and in conjunction with the accompanying drawings.

Referring to Figures 1 and 2, the indoor 110kV vacuum circuit breaker body of the present invention is a series connection of common pole type circuit breakers of different voltage levels, including 72.5kV vacuum circuit breaker 1, 40.5kV vacuum circuit breaker 2, front and rear arrangement Integrated solid-sealed pole 3 and circuit breaker controller 4, the 72.5kV vacuum circuit breaker 1 and 40.5kV vacuum circuit breaker 2 are sealed together by arranging the integrated solid-sealed pole 4 front and back, and the 72.5kV vacuum circuit breaker 1 The low-voltage end of the 40.5kV vacuum circuit breaker 2 and the high-voltage end of the 40.5kV vacuum circuit breaker 2 are connected in series through a soft connection inside the front and rear integrated solid-sealed poles 3; There is a lower outlet seat 32, the upper outlet seat 31 is connected with the upper contact arm 33, the upper contact arm 33 is connected with the high-voltage side plum blossom contact 35 as the high-voltage incoming line access point, the lower outlet seat 32 is connected with the lower contact arm 34, and the lower contact arm 34 is connected to the plum blossom contact 36 on the low-voltage side as the low-voltage outgoing line access point; the circuit breaker controller 4 is installed on the lower end side of the integrated solid-sealed pole 3 arranged front and rear.

The 72.5kV vacuum circuit breaker 1 and the 40.5kV vacuum circuit breaker 2 inside the integrated solid-sealed pole 4 are arranged front and back, and connected in series to form a 110kV vacuum circuit breaker mechanism, as shown in FIG. 3 .

The 72.5kV vacuum circuit breaker 1 and the 40.5kV vacuum circuit breaker 2 are both permanent magnet operating mechanisms, equipped with insulating pull rods inside, and the 72.5kV vacuum circuit breaker 1 and 40.5kV vacuum circuit breaker Weak current isolation.

The whole circuit breaker body adopts indoor group cabinet layout (cabinet type), which is a 110kV vacuum circuit breaker for indoor use.

During operation, the plum blossom contact 35 on the high-voltage side is connected to the high-voltage incoming line, and the plum-blossom contact 36 on the low-voltage side is connected to the low-voltage outgoing line. The circuit breaker controller 4 realizes the asynchronous control of the actions of the 72.5kV vacuum circuit breaker 1 and the 40.5kV vacuum circuit breaker 2, and can combine the current and voltage signals obtained by sampling to realize the phase selection control of a single circuit breaker. The circuit breaker action mode includes: when the circuit breaker controller 4 receives the opening command, it first sends the opening signal to the operating mechanism of the 72.5kV vacuum circuit breaker 1, and then operates the 40.5kV vacuum circuit breaker 2 after a certain delay The mechanism sends the opening signal to ensure that the 72.5kV vacuum circuit breaker 1 contact is separated first; when the circuit breaker controller 4 receives the closing command, it first sends the closing signal to the 40.5kV vacuum circuit breaker 2 operating mechanism, and after a certain delay Then send a closing signal to the 72.5kV vacuum circuit breaker 1 operating mechanism to ensure that the 40.5kV vacuum circuit breaker 2 contacts are closed first.

The delay for the circuit breaker controller 4 to send the opening command to the operating mechanism of the 72.5kV vacuum circuit breaker 1 and the operating mechanism of the 40.5kV vacuum circuit breaker 2 is: the inherent opening time of the 72.5kV vacuum circuit breaker 1 minus the Dispersion threshold of circuit breaker permanent magnet mechanism action. The delay for the circuit breaker controller 4 to send the closing command to the 72.5kV vacuum circuit breaker 1 mechanism drive circuit and the 40.5kV vacuum circuit breaker 2 mechanism drive circuit is: the inherent closing time of the 40.5kV vacuum circuit breaker 2 minus the circuit breaker The dispersion threshold of the permanent magnet mechanism.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (4)

1. An indoor 110kV vacuum circuit breaker body in which common-pole pole-type circuit breakers of different voltage levels are connected in series. The 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker are sealed together through the front and back arrangement of integrated solid-sealed poles, the low-voltage end of the 72.5kV vacuum circuit breaker and the high-voltage end of the 40.5kV vacuum circuit breaker The interior of the integrated solid-sealed pole is connected in series through a flexible connection; the upper end of the front-to-back arrangement of the integrated solid-sealed pole is equipped with an upper outlet seat, and the lower end is equipped with a lower outlet seat. The upper outlet seat is connected with the upper contact arm, and the upper contact arm is connected. The plum blossom contact on the high-voltage side is used as the access point of the high-voltage incoming line, the lower outlet seat is connected to the lower contact arm, and the lower contact arm is connected to the plum blossom contact on the low-voltage side as the access point of the low-voltage outgoing line; The lower side of the pole. 2. The indoor 110kV vacuum circuit breaker body in which common pole type circuit breakers of different voltage levels are connected in series according to claim 1, characterized in that: the 72.5kV vacuum circuit breaker and The 40.5kV vacuum circuit breakers are arranged front and rear, and connected in series to form a 110kV vacuum circuit breaker. 3. The indoor 110kV vacuum circuit breaker body with common pole type circuit breakers of different voltage levels connected in series according to claim 1, characterized in that: the operating mechanisms of the 72.5kV vacuum circuit breaker and the 40.5kV vacuum circuit breaker are both It is a permanent magnet operating mechanism with an insulating pull rod inside. 4. The indoor 110kV vacuum circuit breaker body in which common pole type circuit breakers of different voltage levels are connected in series according to claim 1, characterized in that: the entire circuit breaker body is arranged in an indoor group cabinet.