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Single-phase grounding distance protection system and method on basis of voltage phase comparison

A distance protection, single-phase grounding technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of transition resistance distance protection overrun, refusal to move, etc., achieve high practical engineering value, small calculation amount, and solve distance protection overrun or the effect of the refusal to move the question

Active Publication Date: 2015-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a single-phase grounding distance protection system based on voltage phase comparison and its method, which are used to solve the problem of overrunning or refusal of distance protection caused by transition resistance

Method used

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  • Single-phase grounding distance protection system and method on basis of voltage phase comparison

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Embodiment 1

[0038] figure 1 It is the structural diagram of the single-phase grounding distance protection system based on voltage phase comparison provided by the present invention, as shown in figure 1 As shown, the single-phase grounding distance protection system based on voltage phase comparison provided by the present invention includes sequentially connected data reading module, protection calculation module and protection action module.

[0039] The data reading module is used to collect the voltage and current at the installation place of the distance protection, measure the negative sequence current and the setting value of the distance protection, and send the collected data to the protection calculation module.

[0040] The protection calculation module is used to calculate the phase angle difference between the voltage at the installation place of the distance protection and the voltage at the fault point and the voltage at the installation place of the distance protection an...

Embodiment 2

[0066] Built on RTDS figure 2 The two-machine system shown is simulated and verified. Line parameters: R 1 =0.021Ω / km, X 1 = 0.281Ω / km, C 1 =500MΩ*m; R 0 =0.115Ω / km, X 0 = 0.719Ω / km, C 0 =800MΩ*m; the total length of the line MN is 300km. System E M Impedance Z S1 =4.264+j45.15Ω, Z S0 =0.6+j9.09Ω, the voltage is 525∠δkV; system E N Impedance Z R1 =8.0+59.65Ω, Z R0 =2.0+7.47Ω, voltage 525∠0°kV. Taking the protection at the busbar M as an example, the performance of the adaptive distance protection is tested, and its setting range is 80% of the total length of the line MN. During the simulation process, the fault occurs at t = 0.5s.

[0067] Fault in zone A.

[0068] 1) Simulation of different transition resistances

[0069] When δ=±20°, phase A ground fault occurs through different transition resistances at 180km away from terminal M. The simulation results of this scheme are as follows Figure 5 a-5c and Figure 6 a-6c shown. It can be seen that regardless ...

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Abstract

The invention belongs to the technical field of relay protection of a power system and particularly relates to a single-phase grounding distance protection system and method on the basis of voltage phase comparison. The system comprises a data reading module, a protection calculating module and a protection action module which are sequentially connected. The method comprises the following steps: firstly, calculating and measuring an included angle between a current and a fault voltage by using a relationship of a negative-sequence current phase at the protection mounting position and a negative-sequence current phase at a fault point; respectively calculating phase angles of a fault point voltage and a compensating voltage by using the measured voltage as a reference value; finally, according to the phase difference of the fault point voltage and the compensating voltage when an in-area or out-area fault occurs so as to construct a distance protection criterion. The single-phase grounding distance protection system has excellent resistance to transition resistance; the in-area and out-area faults can be correctly judged regardless of the transition resistance; meanwhile, protection action time and a fixed-value error meet the technical requirements of the grounding distance protection, the calculated amount is small and the single-phase grounding distance protection system has a higher practical engineering value.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a single-phase grounding distance protection system based on voltage phase comparison and a method thereof. Background technique [0002] Single-phase grounding is the most common fault in the power system. Except for the artificially constructed metallic short-circuit fault, there is a transition resistance at the short-circuit point during the fault, and the existence of the transition resistance may easily cause the distance protection to exceed or refuse to operate, which affects the safety of the power system. Running poses serious challenges. [0003] At present, the research on the anti-transition resistance ability of distance protection is mainly divided into three categories: 1) Adaptively set the protection value to enhance the protection anti-transition resistance ability, and establish an adaptive mathematical model to calcu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 马静马伟孙伟楠王桐
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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