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

A technology of fault component and ratio braking, which is applied in the direction of emergency protection circuit devices, electrical components, etc., and can solve the problems that zero-sequence current cannot be completely eliminated

Inactive Publication Date: 2006-06-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is aimed at Y 0 The three-phase current conversion method on the side cannot completely eliminate the influence of zero-sequence current, and a fault component transformer longitudinal differential protection method with zero-sequence ratio braking is provided. Transformer Y 0 The weighted summation of the fault component of the zero-sequence current on the side zero-sequence current constitutes the fault component of the braking c

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 fault component transformer longitudinal differential protection method with zero-sequence ratio braking, which can be achieved by Figure 3 to Figure 5 The circuit block diagram of a fault component transformer longitudinal differential protection element with zero-sequence ratio braking is realized. The element consists of memory A 11 , B 11 , C 11 , A 12 , B 12 , C 12 , 01, subtractor A 21 , B 21 , C 21 , A 22 , B 22 , C 22 , 02, filter A 31 , B 31 , C 31 , A 32 , B 32 , C 32 , 03, Multiplier A 41 , B 41 , C 41 , 04, adder A 42 , B 42 , C 42 and Comparator A 5 , B 5 , C 5 constitute. where memory A 11 , B 11 , C 11 the input of and subtractor A 21 , B 21 , C 21 The positive input terminals of respectively input transformer Y 0 Three-phase differential current instantaneous value signal i da , i db , i dc , memory A 11 , B 11 , C 11 The output terminals are connected to the subtractor A respectively 21 , B 21 , C 21 The nega...

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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 for a power system, in particular to a longitudinal difference protection method for a fault component transformer with zero-sequence ratio braking. Background technique [0002] The current longitudinal differential protection of power transformers is composed of differential quick-break, ratio differential, excitation inrush current detection, overexcitation detection and other components. "Setting Calculation Guidelines", the block diagram of transformer longitudinal difference protection is as follows figure 1 As shown in Figure 2, the wiring example of the longitudinal differential protection principle is shown in Figure 2. Usually a current transformer is used to pair Y 0 Y / Δ transformation is performed on the three-phase current on the side to eliminate the influence of the zero-sequence current. Obviously, after the transformation, each current does not contain the zero-sequence component in...

Claims

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Application Information

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IPC IPC(8): H02H7/045
Inventor 徐习东
Owner ZHEJIANG UNIV
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