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Fault component transformer longitudinal error protecting method with zero sequence ratio brake

A fault component and zero-sequence current technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as the inability to completely eliminate zero-sequence current

Inactive Publication Date: 2008-02-06
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is aimed at Y 0 The side three-phase current conversion method cannot completely eliminate the influence of zero-sequence current, and a transformer longitudinal differential protection method with zero-sequence current fault component ratio braking is provided, through the fault component of the braking current representing the through current in the transformer longitudinal differential protection with transformer Y 0 The fault components of the zero-sequence current on the side zero-sequence current are weighted and summed to form the fault component of the braking current containing zero-sequence current, and the fault component of the braking current containing zero-sequence current and the fault component of the differential current of the corresponding phase are used to form this phase When the fault component ratio braking element of the differential current is greater than the fault component of the braking current containing the zero-sequence current and greater than the minimum operating current, the action signal of the ratio braking element is output

Method used

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  • Fault component transformer longitudinal error protecting method with zero sequence ratio brake
  • Fault component transformer longitudinal error protecting method with zero sequence ratio brake
  • Fault component transformer longitudinal error protecting method with zero sequence ratio brake

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Embodiment 1

[0017] A transformer longitudinal differential protection method with zero-sequence current fault component ratio braking, which can be realized through the circuit block diagram of a transformer longitudinal differential protection element with zero-sequence current fault component ratio braking shown in Figure 3 to Figure 5 . The element consists of a memory A 11 , B 11 、C 11 、A 12 , B 12 、C 12 , O1, subtractor A 21 , B 21 、C 21 、A 22 , B 22 、C 22 , O2, filter A 31 , B 31 、C 31 、A 32 , B 32 、C 32 , O3, multiplier A 41 , B 41 、C 41 , O4, Adder A 42 , B 42 、C 42 and comparator A 5 , B 5 、C 5 constitute. where memory A 11 , B 11 、C 11 input and the subtractor A 21 , B 21 、C 21 The positive input ends of the transformer Y are respectively input 0 The instantaneous value signal of the three-phase differential current on the side i da i db i dc , memory A 11 , B 11 、C 11 The output terminals of are respectively connected to the subtractor A ...

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Abstract

This invention discloses a longitudinal deviation protection method for a fault component transformer with the zero sequence rate brake, which weights the fault component of the brake current representing the through current in the longitudinal protection with that of the zero sequence current of a transformer Yo to get a brake current containing the zero sequence current, the fault component of which is used to make up of a fault component rate brake element of said phase with that of the differential current of a related phase, when the fault component of a differential current is greater than that of a brake current with the zero sequence current and greater than the minimum action current, an action signal of a rate brake element of said element is output.

Description

technical field [0001] The invention relates to a relay protection method of an electric power system, in particular to a transformer longitudinal differential protection method with zero-sequence current fault component ratio braking. Background technique [0002] The current longitudinal differential protection of power transformers consists of components such as differential quick-break, ratio differential, excitation inrush current detection, and over-excitation detection. According to DL / T 684-1999 "Large Generator Transformer Relay Protection Setting Calculation Guidelines", the block diagram of transformer longitudinal differential protection is shown in Figure 1, and the principle wiring example of longitudinal differential protection is shown in Figure 2. Usually using a current transformer for Y 0 Y / Δ transformation is performed on the three-phase current on the side to eliminate the influence of zero-sequence current. Obviously, after the transformation, each cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045
Inventor 徐习东
Owner ZHEJIANG UNIV
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