Quick discrimination method for dynamic impedance of parallel reactor

A reactor, dynamic technology, applied in the field of power system, which can solve problems such as fault prediction sensitivity, real-time performance and speed limit

Inactive Publication Date: 2003-02-26
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
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Problems solved by technology

However, there have been no reports at home and abroad so far, and the sensitivity, real-time and speed of fault prediction are greatly limited.

Method used

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  • Quick discrimination method for dynamic impedance of parallel reactor
  • Quick discrimination method for dynamic impedance of parallel reactor
  • Quick discrimination method for dynamic impedance of parallel reactor

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Embodiment Construction

[0024] The method for quickly judging the dynamic phase impedance of the shunt reactor of the present invention is characterized in that it comprises the following steps:

[0025] (1) Collect and calculate the voltage value of each phase at the head end of the shunt reactor, and judge the sudden drop voltage value ΔU (or line voltage) of the fault phase according to real-time and sine law;

[0026] (2) Synchronously collect and calculate the current value at the head end of the shunt reactor and the sudden rise Δi (it can be collected separately or shared with other protections);

[0027] (3) Quickly calculate the steady-state value and dynamic sudden change impedance value ΔZ according to the characteristics of single-phase single-winding,

[0028] ΔU↓ / Δi↑=ΔZ↓

[0029] ΔU↑ / Δi↓=ΔZ↑>ZW

[0030] (4) According to the single-phase single-winding structure of the shunt reactor, the steady-state impedance value Z of each phase is calculated in real time by phase s...

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Abstract

The present invention relates to parallel reactor relay protection technology for extrahigh and veryhigh voltage electric power system. It includes real-time digital collection, fast judging voltage abrupt reduction in failure phase based on sinusoidal theorem, fast calculation of dynamic impedance abrupt change in failure phase and impedance difference in different phases. The present invention judges the failure property via comparing the abrupt change in dynamic impedance of the failure phase and makes the failure phase to trip after re-judgement. According to the change of voltage, current and impedance of the various phases, different failures, including earthing inside winding, voltage transformer loop failure, turn to turn short circuit and winding open-circuit, may be judged.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a relay protection method for main power equipment of super high voltage and above (750KV and above) electric power system. Background technique [0002] Relay protection is an important part of the safe operation of power systems. During the operation process, the relay protection detects and processes signals in real time and safely, resists various interferences, quickly and accurately judges the fault and removes the faulty equipment without serious damage, so as to protect the safe operation of the system. The shunt reactor prevents load variation during the transmission of electric energy in long-distance, ultra-high voltage and above voltage systems. At low load, the voltage at the end of the transmission is too high to cause danger to the system equipment, and the distributed capacitance and corona leakage in the special transmission corridor environment ...

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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