A backup power automatic input device

Abstract

The invention discloses automatic throw-in equipment of an emergency power supply. Power supply connectors of control ends of starting coils and reset coils of a double-position relay are connected to a secondary-side circuit of a voltage transformer PT of a main power supply and a secondary-side circuit of a voltage transformer PT of the emergency power supply respectively, the secondary-side circuit of the voltage transformer PT of the main power supply is electrically connected with a main power supply bus 110KV-4 through normally-open contacts of a two-position interlocking relay SWJ, the secondary-side circuit of the voltage transformer PT of the emergency power supply is electrically connected with an emergency power supply bus 110KV-5 through normally-open contacts of the two-position interlocking relay SWJ, and a parallel operation mode and a march-past operation mode of 110kV voltage transformers PT are further achieved. The automatic throw-in equipment of the emergency power supply has the advantages of effectively solving design defects of primary equipment, improving operation reliability of a power supply system, preventing major accidents, like protection operation rejection and mal-operation, caused by misoperation, meeting reliable power supply requirements of important users, and improving work levels of the relay protection major.

Description

technical field [0001] The invention relates to the professional technical field of substation operation of electric power system; in particular, it relates to a backup self-injection device that can automatically put the standby power into operation quickly when the common working power is disconnected due to power system failure or other reasons. Background technique [0002] With the increasing modernization of people's production and life in our country, people's demand and dependence on power are also multiplying, and the requirements for power quality are becoming more stringent. The goal of controlling and uninterrupted power supply is moving forward. Some power users especially have more prominent requirements for uninterrupted power supply. Therefore, the mutual switching of various power sources to ensure uninterrupted power supply and high reliability of power supply has become an important part of the protection and control loop in modern power distribution proje...

AI Technical Summary

Problems solved by technology

In this way, the wiring method of the voltage transformer PT cannot meet the logical requirements of the backup and automatic switching of the 110KV inner bridge wiring, and it is impossible to realize the function of the backup and automatic switching

If no modification is made, the 110KV standby automatic switching device will malfunction or refuse to operate, causing huge losses to the power grid

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