Research on the Fault Characteristics of Single-phase Broken Conductor in High-resistance Grounded Marine MV AC Power Systems

doi:10.12382/bgxb.2025.0491

Abstract

Abstract:

The medium-voltage （MV） power systems with high-resistance grounding at the neutral point are becoming increasingly prevalent with the continuous development of ship power systems.Single-phase disconnection fault，a common electrical issue，can cause significant overvoltage in the power systems.This paper analyzes three scenarios of single-phase disconnection fault：disconnection without grounding，grounding at the power supply side of the disconnection point，and grounding at the load side of disconnection point.Considering the factors such as transition resistance at the grounding point，load impedance，and the location of disconnection，the symmetrical vector method is used to derive the analytical expression for zero-sequence voltage before and after disconnection.The relationship characteristics of overvoltages at both ends under different conditions are analyzed based on the theory of inverse transformation and conformal mapping.A typical power system simulation model is constructed to verify the correctness of the theoretical analysis results，providing a theoretical foundation for the precise localization of single-phase disconnection faults in power systems in the future.

Key words: medium voltage power system in ship, high resistance grounding, disconnection fault, zero sequence voltage

CHEN Shuang, WU Benxiang, CHEN Cheng. Research on the Fault Characteristics of Single-phase Broken Conductor in High-resistance Grounded Marine MV AC Power Systems[J]. Acta Armamentarii, 2025, 46(S1): 250491-.

Figures/Tables 23

Fig.1 Four kinds of cable grounding forms after the power system of ship breaks down

Fig.2 Analysis model of single-phase disconnection fault in ship power system

Fig.3 Equivalent analysis model of fault on both sides of the point

Fig.4 Phasor diagram of zero-sequence voltage upstream of the fracture

Fig.5 Polar coordinate trajectory of the amplitude of U0 with respect to the resistance value of neutral point

Fig.6 Phasor diagram of zero sequence voltage downstream of the fracture

Fig.7 Polar coordinate trajectory of the amplitude of U'0 with respect to the resistance value of the neutral point

Fig.8 Equivalent analysis model of fault grounding on the power side of disconnection point

Fig.9 Phasor diagram of zero sequence voltage upstream of the fracture

Fig.10 The complex plane trajectory of the amplitude of UO with respect to the resistance value of the neutral point

Fig.11 Phasor diagram of zero sequence voltage downstream of the fracture

Fig.12 The complex plane trajectory of the amplitude of U'O with respect to the resistance value of the neutral point

Fig.13 Equivalent analysis model of fault grounding on the load side of disconnection point

Fig.14 Polar coordinate trajectory of the amplitude of U0 with respect to the resistance value of the neutral point

Fig.15 Polar coordinate trajectory of the amplitude of U'0 with respect to the resistance value of the neutral point

Fig.16 Change trend of zero-sequence voltage upstream of the fracture under three fault types

Fig.17 Change trend of zero-sequence voltage downstream of the fracture under three fault types

Fig.18 Simulation system model

Table 1 Cable setting parameters in the simulation model

线路类型	R₁/ （Ω·km^-1）	C₁/ （F·km^-1）	L₁/ （mH·km^-1）	R₀/ （Ω·km^-1）	C₀/ （F·km^-1）	L₀/ （mH·km^-1）
电缆	0.12	0.15×10^-6	0.35	0.25	0.9×10^-6	0.65

Table 2 Simulated results of three types of disconnection faults （part） for α=1/2

	断线不接地		断线点电源侧接地		断线点负载侧接地
R_L/Ω	$\left\|{U}_{0}\right\|$/V	$\left\|U\text{'}{ }_{0}\right\|$/V	$\left\|{U}_{0}\right\|$/V	$\left\|U\text{'}{ }_{0}\right\|$/V	$\left\|{U}_{0}\right\|$/V	$\left\|U\text{'}{ }_{0}\right\|$/V
50	11.4	2714.0	1795.7	4456.7	57.9	1796.0
100	22.8	2713.0	2693.0	5353.3	113.3	1758.3
200	45.4	2710.0	3590.0	6250.0	216.9	1687.7
300	67.8	2705.3	4036.7	6696.7	311.9	1623.0
400	89.8	2699.0	4306.7	6966.7	399.0	1563.7
500	111.4	2691.0	4486.7	7143.3	479.0	1509.7
1000	209.5	2635.3	4893.3	7553.3	792.3	1304.0
1500	288.0	2566.0	5046.7	7703.3	1008.3	1175.3
2000	347.0	2498.3	5126.7	7783.3	1161.0	1095.7
2500	390.3	2439.7	5176.7	7833.3	1275.0	1045.0
3000	421.7	2391.7	5210.0	7866.7	1368.7	1014.3

Fig.19 Zero-sequence voltage characteristic curve of open circuit fault without grounding when α=1/2

Fig.20 Zero-sequence voltage characteristic curve of power supply side grounding fault at the disconnection point when α=1/2

Fig.21 Zero-sequence voltage characteristic curve of load side grounding fault at the disconnection point when α=1/2

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