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Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor

An inter-turn short-circuit and reactor technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of judging unseen innovations and improve reliability, real-time sensitivity, reliable operation, fault monitoring and elimination limits, inter-turn short circuit The problem of high failure ratio, to achieve the effect of fast action, high reliability and high sensitivity

Inactive Publication Date: 2003-02-26
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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AI Technical Summary

Problems solved by technology

Due to the characteristics of the power system, the proportion of inter-turn short circuit faults is relatively high due to the formation of shunt reactor harmonic overheating and severe micro-vibration
The number of shunt reactors operating in domestic and foreign power systems has increased sharply, but its inter-turn short circuit protection has not seen innovation in its judgment and improvement of reliability and real-time sensitivity due to its single-winding inductive electrical appliances. Monitoring and exclusion are very limited

Method used

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  • Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor
  • Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor
  • Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor

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Embodiment Construction

[0033] The fault-tolerant re-judgment method for inter-turn short circuit protection of shunt reactors of the present invention is characterized in that it comprises the following steps:

[0034] (1) Utilize the advanced and reliable data acquisition platform to provide a reliable and sensitive basis for fault-tolerant rejudgment data;

[0035] (2) For the voltage mutation value ΔU at the head end of each phase shunt reactor winding during operation, the head and end current i 1 i 2 , synchronously calculate the zero-sequence increment value Δ3U of the three-phase voltage and current 0 , Δ3I 0 ;

[0036] (3) Real-time synchronous judgment is made on the current, voltage value and angle variation collected in real time, in which the voltage drop at the head end is judged by the sine law synchronously and quickly, which is the basis of fast instantaneous judgment;

[0037] (4) re-judgment quickly according to the following equations at the synchronization of each above-menti...

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Abstract

The present invention relates to protection technology for extrahigh and veryhigh voltage electric power system and is the fault-tolerant discrimination method for turn-to-turn shor-circuit protection of parallel reactor. It includes two parts of fault-tolerant discrimination method and real-time dynamic impedance compensation criterion. The fault-tolerant discrimination method includes reliable collection platform circuit and its use in collecting relevant data for fault-tolerant discrimination. The real-time dynamic impedance compensation is used for raising the sensitivity and reliability in judging the turn-to-turn shor-circuit failure of parallel reactor.

Description

technical field [0001] The invention belongs to the field of electric power systems, in particular to a relay protection method for main power equipment of ultra-high voltage and ultra-high voltage (750KV) electric power systems. Background technique [0002] Relay protection is an important part of power system operation safety, system fault detection and real-time rapid removal of faults. Safety detection during operation of relay protection, resistance to various disturbances, ensuring normal and safe operation and accurate judgment of failures, and rapid removal of main power equipment at the initial stage of failure to protect its equipment from serious damage and system safety are important indicators. Shunt reactors play a key role in preventing distributed parameters from causing overvoltage at the end of the transmission line when the load is light in the process of long-distance, ultra-high voltage or ultra-high voltage power transmission. Due to the characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00
Inventor 沈建石
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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