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
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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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