Controlled switching control device

Abstract

The invention provides a controlled switching control device. The device comprises a CPU module, an alternating-current analog quantity input plug-in, a switching quantity transmitter signal input plug-in, a power source module and a switching quantity output plug-in. With the controlled switching control device of the invention adopted, electromagnetic transient effects such as inrush current andovervoltage generated in a switching process can be actively eliminated, the stabilization of system voltage is facilitated, the maintenance periods and service lives of a circuit breaker and power equipment are prolonged.

Description

technical field [0001] The invention relates to a phase selection opening and closing control device of a circuit breaker, which is suitable for the phase selection opening and closing control of electric equipment in an AC station and a DC converter station. Background technique [0002] Under the background of the State Grid Corporation's promotion of UHV AC and DC transmission technology, the problem of overvoltage in UHV power grids has become prominent. The traditional method of suppressing inrush current and overvoltage has the following disadvantages, whether it is installing closing resistors or setting arresters: complex installation and structure, poor reliability, high cost, and strict requirements on the level of insulation structure; complicating the internal structure of the circuit breaker , which increases the intermediate link and reduces the reliability; in some cases, the control effect of a single measure is not ideal, and other measures are still needed ...

AI Technical Summary

Problems solved by technology

The traditional method of suppressing inrush current and overvoltage has the following disadvantages, whether it is installing closing resistors or setting arresters: complex installation and structure, poor reliability, high cost, and strict requirements on the level of insulation structure; complicating the internal structure of the circuit breaker , which increases the intermediate link and reduces the reliability; in some cases, the control effect of a single measure is not ideal, and other measures are still needed to assist and the parameter calculation is complicated; the arrester has a blind area, is large in size, and is easy to age. For example, the continuous operating voltage will Damage to the zinc oxide valve plate, etc.

Its products have the following disadvantages: 1. Generally, only single-phase voltage reference is used, and there is no three-phase voltage reference function

2. Poor adaptability, no self-learning and self-correction capabilities: only for a certain type of switch, or external parameter compensation must be a known condition, and cannot be automatically obtained and corrected in real time

3. Does not have the function of automatic judgment and intelligent switching of compensation mode and adaptive mode

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