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

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

Active Publication Date: 2017-10-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Effect test

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 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. The system includes a sequentially connected data reading module, a protection calculation module and a protection action module; the method includes : First, use the relationship between the negative sequence current phase at the protection installation and the negative sequence current phase at the fault point to calculate the angle between the measured current and the fault voltage; then, use the measured voltage as a reference value to calculate the phase of the fault point voltage and the compensation voltage Finally, according to the phase difference between the fault point voltage and the compensation voltage when the fault is inside and outside the fault, the distance protection criterion is constructed. The invention has a good anti-transition resistance capability, and can correctly distinguish faults inside and outside the zone regardless of the size of the transition resistance; at the same time, the protection action time and fixed value error meet the technical requirements of grounding distance protection, and the calculation amount is small, which has a high engineering practical 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 Patents(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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