Anti-overvoltage measurement and control system and method

Abstract

The invention discloses an anti-overvoltage measurement and control system and a method; the system mainly comprises an analog input circuit, a DSP processor and a peripheral circuit thereof, a switch quantity input circuit and a switch quantity output circuit; an overvoltage lightning protection circuit is parallelly connected with a switch quantity remote communication input circuit; when the high voltage is input into the circuit through switch quantity remote communication, the overvoltage lightning protection circuit is started, the high-voltage input of the switch quantity remote communication input circuit is disconnected; a DC relay is arranged between a switch quantity remote output circuit and a secondary control circuit; the DC relay connects the secondary control circuit before remote control or manual operation; and after operation, the secondary control circuit is isolated. The invention can effectively prevent primary AC voltage reverse connection secondary equipment from causing secondary equipment faults, has good use effect, and effectively improves the reliability of a transformer substation monitoring system.

Description

technical field [0001] The invention belongs to the technical field of electric power system automatic control, and in particular relates to an overvoltage prevention measurement and control system and method. Background technique [0002] As we all know, all electrical and electronic equipment must work under rated power supply voltage conditions, and overvoltage exceeding the equipment's ability to withstand is very harmful to the equipment. There are many reasons for overvoltage. In addition to human errors, there are usually the following four situations: 1) the action of lightning in nature; 2) the switching of the working state of large-scale equipment on the power grid; 3) harmonic resonance caused by large-scale harmonic equipment ; 4) strong electromagnetic radiation interference. From the perspective of power supply protection, these situations can be divided into two types: one is general overvoltage with a periodic nature and the voltage change rate is not too l...

AI Technical Summary

Problems solved by technology

At present, the measurement and control devices of substations are all integrated circuit modules, and the working ground is the reference potential of the module. Therefore, the working voltage is low, and the withstand voltage insulation level against high potential is low. Secondary equipment failures bury accident safety hazards for the safe operation of equipment, and even seriously endanger the personal safety of equipment operation and management personnel

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