Main station type small current grounding control method

Abstract

The invention discloses a main station type small current grounding control method. Remote measure and communication information collected by an energy management system are utilized at a dispatching main station end, a small current grounding bus is automatically monitored according to the line voltage change condition, the abnormal warning is automatically given, the network topology analysis is combined, a local topology search method is adopted, a wire outlet operation switch of a target bus is analyzed and given, meanwhile, breaking-off wire selection strategies such as capacitor priority, loss load minimization, important load guarantee and the like are provided, the system can automatically generate breaking-off sequence suggestions of the circuit breaking-off test according to the selected strategies, a switch in the breaking-off strategies is subjected to on-off operation through sequence remote control, the bus voltage change condition after the operation is monitored, and whether the single-phase grounding is eliminated or not is judged, so a single-phase grounding circuit is analyzed and judged. The method has the advantages that a computer auxiliary means is provided for the single-phase fault processing mode of regional dispatching monitoring personnel, the efficiency on accident handling is improved, and the power supply reliability is forcefully guaranteed.

Description

technical field [0001] The invention belongs to the field of power system scheduling automation, and relates to a master station type small current grounding control method, which handles single-phase grounding faults of the small current grounding system at the power grid dispatching master station. Background technique [0002] The power system can be divided into large current grounding system (including direct grounding, reactance grounding and low resistance grounding) and small current grounding system (including high resistance grounding, arc suppression coil grounding and non-grounding) according to the grounding method. Most of my country's 3-66kV power system adopts the operation mode of ungrounded neutral point or grounded through arc suppression coil, which is a small current grounding system. [0003] In the small current grounding system, single-phase grounding is a common temporary fault, which mostly occurs in wet and rainy weather. After a single-phase gro...

AI Technical Summary

Problems solved by technology

[0005]1. Low degree of automation

The processing method is mainly manual operation, and the alarm information is easy to be missed, which is not conducive to the immediate handling of the accident, and the workload of the monitoring personnel is heavy.

[0006]2. Lack of auxiliary decision-making means for line selection

After the grounding alarm is discovered, the monitoring personnel cannot immediately determine the grounding line, mainly relying on manual experience for trial pull, lack of effective auxiliary decision-making means, resulting in inefficient decision-making and the possibility of mishandling

[0007]3. Low efficiency of road pulling

During the line selection test, the monitoring personnel must always monitor the bus voltage changes, the operation process is complex, lack of effective closed-loop control methods and measures, the efficiency of the line is low, and even the phenomenon that the line cannot be pulled in time

[0008]4. Regional dispatching currently does not provide effective management and technical means for the single-phase ground fault pull circuit of the small current grounding system

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