Outdoor high-voltage double power supply vacuum breaker

Abstract

The invention discloses an outdoor high-voltage double power supply vacuum breaker, which comprises a three-phase outdoor high-voltage vacuum breaker, a voltage transformer, current transformers, isolating switches and an automatic controller, wherein the voltage transformer is arranged in a waterproof base; the three-phase outdoor high-voltage vacuum breaker is arranged on the base; the current transformers are arranged at two sides of a lower outgoing line of the three-phase outdoor high-voltage vacuum breaker; the current transformers are connected with the isolating switches; mechanical interlocking devices which are connected with the three-phase outdoor high-voltage vacuum breaker and the isolating switches are also arranged at two sides of the three-phase outdoor high-voltage vacuum breaker; main shafts of the isolating switches at two sides are connected by a connecting rod; an unlocking device is arranged on the connecting rod; a maintenance operation handle is arranged at the end of the main shaft of the isolating switch at one side; an electric clutch device is arranged on the main shaft of the isolating switch at the other side; a manual operation handle is arranged at the end part of the electric clutch device; and the electric clutch device is engaged with a drive motor through a gear. The outdoor high-voltage double power supply vacuum breaker is applied to a high-voltage double power supply line, can be automatically or manually switched, and is convenient to repair and maintain and good in safety and reliability.

Description

technical field [0001] The invention relates to an outdoor high-voltage double-power vacuum circuit breaker used for a high-voltage double-power supply line. Background technique [0002] Now, many power users who have high requirements for power supply safety and reliability, in order to ensure the continuity of power supply, use two 10kV high-voltage power supplies (high-voltage dual power supplies) for power supply, which can greatly improve the reliability and safety of power supply To ensure equipment and personal safety. However, if two high-voltage power supplies are used for power supply, there is a problem of how to switch and protect the two power supplies. That is, after one power supply fails, how to quickly and safely switch to another power supply. At present, there are mainly the following schemes: (1) Use multiple indoor high-voltage switch cabinets to realize switching and protection of high-voltage dual power supplies. This is the most widely used high-v...

AI Technical Summary

Problems solved by technology

But there are also obvious disadvantages: (1) large investment

The cost of the switchgear is very high, and to achieve dual power supply, at least two or more high-voltage switchgears are required, and the cost is obviously higher than other solutions

(2) It covers a large area, and it is necessary to build a special power distribution room and be equipped with related supporting facilities, which requires a large investment in infrastructure

In the mining area, there is a problem with the construction of the power distribution room

(3) Poor environmental adaptability

The general operating temperature range of high-voltage switchgear is -5°C ~ +40°C. In severe cold areas, heating measures are required to increase maintenance costs.

(4) The interlocking and operating procedures are complex, and it is easy to fail to achieve the expected function due to failure to operate according to the operating procedures

(5) If there is no electric isolating switch to realize the isolation of the two power sources, as long as the insulation failure of the breaker breaker (such as air leakage in the vacuum interrupter, etc.) occurs, it is easy to cause the parallel operation of the two power sources or the reverse power transmission accident

However, because it is based on a load switch, it cannot achieve short-circuit protection, so it must be equipped with a fuse to achieve short-circuit protection

And there is no obvious isolation fracture, and an isolation switch must be configured separately to realize line inspection and maintenance

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