High-voltage switch

Abstract

The invention discloses a high-voltage switch, which includes a base provided with an opening and closing operating mechanism and three poles, and the opening and closing operating mechanism synchronously drives the moving contacts in the three poles to perform opening and closing actions; Auxiliary power conversion mechanism; the main and auxiliary power conversion mechanism includes a switching operation mechanism; the conversion operation mechanism includes rotating the isolation main shaft arranged on the isolation frame, three isolation crank arms arranged on the isolation main shaft, connecting each isolation crank arm and corresponding An insulating pull rod for an isolation knife, an electric clutch drive mechanism for electrically driving the isolation main shaft to rotate, and an isolation handle for manually driving the isolation main shaft to rotate; each second power supply terminal includes a first terminal fixedly arranged on a corresponding power outlet terminal block. Two insulating columns and a second power terminal block fixedly arranged on the second insulating columns. The invention can intelligently switch between main and auxiliary power sources.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrics, and in particular relates to a high-voltage switch. 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 operation immediately to restore the power supply. switch. [0003] The traditional main and auxiliary power conversion mechanism uses two high-voltage switch cabinets plus a set of extremely complicated electrical interlocking devices to strictly prevent the parallel operation of the two circuits. This double power supply device has following ...

AI Technical Summary

Problems solved by technology

[0003] The traditional main and auxiliary power conversion mechanism uses two high-voltage switchgears 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 kind of main and auxiliary power conversion mechanism is that the work reliability is poor, and it may cause serious accidents; for example, when the main power supply circuit is powered off for routine maintenance, the coil in the high-voltage circuit breaker connected to the main power supply may be burned. However, the circuit in the high-voltage circuit breaker remains open. At this time, another high-voltage circuit breaker in the main and auxiliary power conversion mechanism will immediately connect to the backup power supply to continue power supply, which will cause the original power to be cut off. The main power supply circuit of the main power supply circuit is also charged, which can easily lead to electric shock accidents for maintenance personnel who overhaul the main power supply circuit

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

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