地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法

doi:10.19595/j.cnki.1000-6753.tces.222116

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Abstract

Underground HV (High Voltage) cable is the backbone of modern urban power system. In the last decades, the sheath-to-ground fault is becoming one of main fault modes contributing to the single phase grounding fault. Sheath current sensing is widely adopted in the field test to detect the sheath-to-ground fault. However, the synchronization of distributed sheath current sensing base on GPS (Global Position System) or Beidou is unstable because the time transfer tag is usually unavailable in underground cable tunnel. To achieve the synchronization of distributed sheath current sensing independent of external time transfer provided by GPS or Beidou, a time delay control method based on Smith predictor compensator and recursive least squares method(RLSM) using the capacitive current as reference of the measured sheath current in the same sheath loop is proposed in this paper.
Firstly, the architecture of the distributed sheath current sensing in HV cross-boned cable systems is introduced and the formulation of the measured sheath current in the same sheath loop with time delay is deduced. Secondly, the electromegnetic coupling relationship between the sheath current and load current is modelled, whilst the phasor difference of the measured sheath current in the same sheath loop without time delay is formulated as the reference of the RLSM. Thirdly, the parallel Smith predictor is proposed to compensate the time delay error of the adjacent sheath current detection points in the same sheath loop. Finally, a recursive least squares tracking method for the time delay error of the multi-sheath current sensor is proposed to obtain the time delay with the minimum residual.
The proposed method is verified by field test of a 220 kV cross-boned cable supplying the high-speed traction transformer. The results show that the waveform of capacitive current which is the reference of RLSM inosculates well with difference of the measured sheath current in the same sheath loop after using the proposed method. Besides, the maximum different between them is 0.297 A and the minimum different is 0.002 A. Moreover, the reference standard for time delay estimation is the average residual of the three loops, the minimum residual of each loop is between 0.28 A-0.33 A. In addition, the Smith predictor is translated for the 197th time, and the residual value in the overall range is the smallest when the time delay offset is 3.94 s, which is 0.3 A.
The following conclusions can be drawn from the experiment: (1) the instantaneous value of the current difference between adjacent sheaths in the same loop inosculates with the instantaneous value of the capacitor current after using the proposed method, which implies the synchronization of distributed sheath current sensing. (2) when distributed sheath current sensing is asynchronous, the current phasor difference of the sheath is not accurate, which will affect the evaluation of the grounding state of the sheath. (3) the proposed method converges to the minimum average residual value 0.3 A in the global range, whilst the time delay is 3.94 s.

Key words： HV cable cross-bonding sheath current online monitoring time-delay control

Received: 08 November 2022

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TM274

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	Zhou Shasha
	Wang Hang
	Yang Bin
	Xia Zhanran
	Zhou Chengke

Cite this article:

Zhou Shasha,Wang Hang,Yang Bin等. Time Delay Control Method for Distributed Sheath Current Sensing System of Underground Cross-bonding High Voltage Cable[J]. Transactions of China Electrotechnical Society, 0, (): 123-123.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222116 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/123

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