10KV vacuum circuit breaker

Abstract

The invention discloses a lightening protection device of a 10KV vacuum circuit breaker, which comprises a vacuum circuit breaker body, a dual-power supply switching mechanism and a lightening protection device. The dual-power supply switching mechanism comprises a main power supply terminal, a spare power supply terminal, a rotating shaft, three isolation switches, three insulation pull rods anda driving mechanism, wherein the main power supply terminal is arranged on the left side of the upper surface of a case of the vacuum circuit breaker; the spare power supply terminal is arranged on the right side of the upper surface of the case; the rotating shaft is provided with hole cavities; the three isolation switches are arranged between the main power supply terminal and the spare power supply terminal; the rotating shaft and the isolation switches are connected by the three insulation pull rods; and the driving mechanism drives the rotating shaft to rotate. Wire inlet terminals of the vacuum circuit breaker body are arranged in the middle of the upper surface of the case of the vacuum circuit breaker, and the top end of each wire inlet terminal is rotatably connected with one corresponding isolation cutter. The lightening protection device comprises an arrester which is fixedly arranged on the case. The invention has the advantage that the structure is simple, no matter where the thunder strikes on the switch, the lighting protection can be effectively performed, and the components in the switch are protected.

Description

technical field [0001] The invention belongs to the technical field of structural design of a high-voltage vacuum circuit breaker, and in particular relates to a 10KV vacuum circuit breaker. Background technique [0002] In the power network, there are many users who have high requirements on the reliability of power supply, such as coal mines and oil refineries. Once a power outage occurs in these units, it will bring significant economic losses or even casualties to the unit. Therefore, the power supply in these units In the system, both the main power supply and the backup power supply are required. When the main power supply fails, the backup power supply must be put into power immediately to restore the power supply. In order to achieve this purpose, it is necessary to manually switch between the main power supply and the backup power supply through a dual power supply switching mechanism. or switch automatically. [0003] The traditional dual power switching mechanism...

AI Technical Summary

Problems solved by technology

[0003] The traditional dual power switching mechanism uses two high-voltage switch cabinets plus a set of extremely complicated electrical interlocking devices to prevent parallel operation of the two circuits

This kind of dual power supply device has the following three major defects: (1) Unreliable locking: At present, the reliability of electrical interlocking is too low, and it is strictly forbidden to use it. There is no unified design specification standard for mechanical interlocking devices, and it can only be designed and modified by each locality.

(2) The operation is complicated, and it is easy to jam, causing electric accidents; (3) The investment is large, and two switch cabinets need to be purchased, and then the locking device is designed, and then refitted to the switch cabinet

The disadvantage of this dual power switching mechanism is poor reliability and may lead to serious accidents; for example, when the main power supply circuit is powered off for routine maintenance, the coil in the circuit breaker connected to the main power may be burned out, However, the circuit in the circuit breaker remains on, at this time, the other circuit breaker in the dual power switching mechanism will immediately connect to the backup power supply to continue power supply, which will cause the main power supply circuit that should have been powered off. It is also live, which can easily lead to electric shock accidents for maintenance personnel who overhaul the main power circuit

In addition, due to the need to purchase two circuit breakers, the investment is relatively large

[0005] In addition, the traditional dual-power high-voltage switch lacks lightning protection devices, so once it is struck by lightning, it will cause damage to the switch body, and even cause power failure accidents.

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