Pilot protection method for power transmission line based on signal distance and Bergeron model
A transmission line, longitudinal protection technology, applied in the direction of the fault location, etc., can solve the problems of optical fiber current differential, incorrect action of protection, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0055] Embodiment 1: Simulation system such as figure 1 As shown, the transmission line M-N adopts the J.Marti frequency-dependent line model, and the total length of the line is 150km. Characteristic impedance in α mode Z c = 239.0203Ω, resistance r = 2.7188e-5Ω / m, wave velocity v = 2.9657e+8m / s. Phase A ground fault occurs in the line M-N, and the fault location is 10km away from the M terminal ( x =10km), such as figure 1 middle k 2 , Transition resistance 100 ohms.
[0056] When a fault occurs on the transmission line, the simulation sampling frequency is set to 20kHz, and within a short time window of 3 ms, the voltage at the M point at the head end and the N point at the end of the transmission line is measured u M 、u N and current i M 、i N , according to the expression of current distribution law along the Bergeron model, the measured voltage at the head end u M and current i M Simulation calculation of the current at the end of the transmission...
Embodiment 2
[0069] Embodiment 2: Simulation system such as figure 1 As shown, the transmission line M-N adopts the J.Marti frequency-dependent line model, and the line parameters are the same as those in Embodiment 1. Phase A ground fault occurs in the line M-N, and the fault location is 50km away from the M terminal ( x =50km), such as figure 1 middle k 3 , Transition resistance 300 ohms.
[0070] After the transmission line fails, follow the same method as in Example 1, take the simulation sampling frequency as 20kHz, and simulate and calculate the current at the end (N side) of the transmission line within a short time window of 3ms .
[0071] Take the tuning factor k a =0.6, set the setting value is 0.35. After calculation, the simulated current at the end of the transmission line and measured current i N Mutual distance =0.901, > , and it is judged as an intra-area fault of the transmission line.
Embodiment 3
[0072] Embodiment 3: simulation system such as figure 1 As shown, the transmission line M-N adopts the J.Marti frequency-dependent line model, and the line parameters are the same as those in Embodiment 1. Phase A ground fault occurs in the line P-M, and the fault location is 40km away from the M terminal ( x =40km), such as figure 1 middle k 1 , Transition resistance 100 ohms.
[0073] After the transmission line fails, the simulation sampling frequency is set to 20kHz, and within a short time window of 3 ms, the current at the end (N side) of the transmission line is simulated and calculated according to the same method as in Example 1 , to get the measured current at the terminal i N with analog current Waveform diagram such as image 3 shown.
[0074] Take the tuning factor k a =0.6, set the setting value is 0.35. After calculation, the simulated current at the end of the transmission line and measured current i N Mutual distance =0.0504, ≤ , ...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com