Method for controlling remote-control switching reclosure system applicable to microcomputer protection control

Abstract

The invention discloses a method for controlling a remote-control switching reclosure system applicable to microcomputer protection control, which includes: 1, selecting remote control of switching of a reclosure; 2, remotely controlling switching of the reclosure by a scheduling master station; 3, controlling acceleration overcurrent of a microcomputer protection device and zero current protection; 4, controlling zero current protection of the microcomputer protection device; 5, controlling inverse time limit overcurrent protection of the microcomputer protection device; 6, controlling low-cycle deloading protection of the microcomputer protection device; 7, starting the microcomputer protection device when line outlet is in short circuit; 8, performing switch trip of a pulse input switch mechanism; 9, generating position change of auxiliary nodes of a switch after switch trip; 10, recording an input terminal of the microcomputer protection device as a logic 1, outputting closing pulse to the reclosure; and 11, performing closing operation by a control circuit of the reclosure according to remote switching commands. The method for controlling the remote-control switching reclosure system realizes remote control of the reclosure, workload of staff is saved, time for task operation is shortened, and safety and stability of the remote-control switching reclosure system are improved.

Description

technical field [0001] The invention relates to a power grid control technology, in particular to a control method for a remote control reclosing system suitable for protection and control by a microcomputer. Background technique [0002] In order to adapt to changes in the operation mode of the power grid and the safety regulations when the line is working, the operation mode of the distribution line often needs to be changed as needed. Therefore, the line reclosing also needs to change state frequently accordingly, put into or withdraw from. At present, the substations in the Pudong area of ​​Shanghai are basically unattended stations, and the operation and withdrawal of the line reclosing function are all completed by the operating personnel. Due to the vast area of ​​Pudong area and the distribution of substations in various places, manual reclosing switching on and off takes up a lot of personnel and vehicle resources. Therefore, how to effectively reduce the workload...

AI Technical Summary

Problems solved by technology

[0006] 1. The switching efficiency of the reclosing switch is not good: because the relay protection and the circuit of the automatic device still use the hard pressure plate (that is, the connecting piece LP) to switch and switch, the remote control operation cannot be realized. When the mode is adjusted, the line is live or When the channel is abnormal, it is necessary to send personnel to the unattended substation to perform the operation of switching on and off the hard plate. These simple and frequent operation tasks not only make the maintenance and operation team tired, but also cause the completion of the operation task due to the influence of road and traffic. The time is relatively long, which increases the system insecurity;

[0007] 2. Lack of means for remote monitoring of reclosing switching status: At present, for the switching status of reclosing function of 35 kV and below line protection in Pudong area, the integrated automation system does not collect the semaphore. Neither the comprehensive automated background machine can monitor it, and only rely on the on-site reclosing switch and retreat pressure plate as a distinctive sign, which is not conducive to timely query;

[0008] 3. It is not conducive to the rational allocation of resources: In view of the climate characteristics of the Shanghai area, from June to September is the concentrated period of typhoon and lightning strikes, and it also coincides with the peak power consumption, which is the heaviest load on the power grid every year and the weakest repair force season

During this period, the work of reclosing switching on and off scattered a large number of relatively tense emergency repair operations, which caused hidden dangers to the safety and stability of the power grid;

[0009] 4. Increase uncertainties in safe production: The fatigue operation that may be caused by the extra workload caused by various force majeure has greatly increased the work risk of the operator. In addition, since the reclosing and withdrawal work is mostly concentrated in thunderstorm weather, road traffic during the period The situation is mostly tense, and operators frequently travel between multiple substations, which also greatly increases the possibility of driving safety accidents

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