Multiple Characteristics Criterion Based Incipient Fault Detection of Distribution Systems

doi:10.11930/j.issn.1004-9649.202309031

Abstract

Abstract:

The fault characteristics of the new distribution system have changed significantly under the high proportion of new energy access, with variable operation modes and limited short-circuit currents. In this regard, arc-type early faults are the signs of short-circuit in the power system.The effective identification of early faults in advance can avoid the problem of short-circuit faults, which is difficult to jump off. Based on the equivalent model of early faults, the paper analyses the electrical quantity characteristics and temperature characteristics of the fault arc, and proposes an arcing high-resistance fault detection method that combines the current and temperature characteristics at the same time. The method integrates the speed of electrical signals and the high sensitivity and reliability of thermal signals, and then based on the composite characteristic quantity fault parameter identification criteria to detect the early faults. The effectiveness of the proposed method is verified comprehensively by simulation in PSCAD, field data and fault test in labs.

Key words: new distribution system, incipient fault, fault detection, arc modelling, composite eigenvalue criterion

Anning WANG, Rongqi FAN, Yang ZHANG, Jiachao LIU, Wei HU, Shimin ZHONG, Ke JIA. Multiple Characteristics Criterion Based Incipient Fault Detection of Distribution Systems[J]. Electric Power, 2024, 57(9): 181-193.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202309031

https://www.electricpower.com.cn/EN/Y2024/V57/I9/181

Figures/Tables 20

References 35

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线路类型	R₁	C₁	L₁	R₀	C₀	L₀
架空线	0.1700	0.0097	1.2096	0.2300	0.0060	5.4749
电缆	0.2700	0.3390	0.2550	0.2700	0.2800	1.0190

线路类型	R₁	C₁	L₁	R₀	C₀	L₀
架空线	0.1700	0.0097	1.2096	0.2300	0.0060	5.4749
电缆	0.2700	0.3390	0.2550	0.2700	0.2800	1.0190

结构	材料	参数	数值
缆芯	铜	厚度/半径（D₁）/mm	30.3
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	55274
		相对介电常数（ε₁）	1
		导热系数（y₁）/(W·(m·K)^–1)	30.1
		密度（rho₁）/(kg·m^–3)	8700
		恒压热容（C₁）/(J·(kg·K)^–1)	385
导体屏蔽层	半导体混合物	厚度/半径（D₁）/μm	0.85
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	2
		相对介电常数（ε₁）	2.25
		导热系数（y₁）/(W·(m·K)^–1)	10
		密度（rho₁）/(kg·m^–3)	1055
		恒压热容（C₁）/(J·(kg·K)^–1)	2405
绝缘层	交联聚乙烯	厚度/半径（D₁）/mm	19.5
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	10^–18
		相对介电常数（ε₁）	2.5
		导热系数（y₁）/(W·(m·K)^–1)	0.46
		密度（rho₁）/(kg·m^–3)	930
		恒压热容（C₁）/(J·(kg·K)^–1)	2302
绝缘屏蔽层	半导体混合物	厚度/半径（D₁）/μm	0.85
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	2
		相对介电常数（ε₁）	2.25
		导热系数（y₁）/(W·(m·K)^–1)	10
		密度（rho₁）/(kg·m^–3)	1055
		恒压热容（C₁）/(J·(kg·K)^–1)	2405
金属层	铝	厚度/半径（D₁）/mm	2.50
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	3.774×10⁷
		相对介电常数（ε₁）	1
		导热系数（y₁）/(W·(m·K)^–1)	238
		密度（rho₁）/(kg·m^–3)	2700
		恒压热容（C₁）/(J·(kg·K)^–1)	900
外护层	聚乙烯	厚度/半径（D₁）/mm	2.90
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	10^–18
		相对介电常数（ε₁）	2.5
		导热系数（y₁）/(W·(m·K)^–1)	0.46
		密度（rho₁）/(kg·m^–3)	935
		恒压热容（C₁）/(J·(kg·K)^–1)	2302

结构	材料	参数	数值
缆芯	铜	厚度/半径（D₁）/mm	30.3
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	55274
		相对介电常数（ε₁）	1
		导热系数（y₁）/(W·(m·K)^–1)	30.1
		密度（rho₁）/(kg·m^–3)	8700
		恒压热容（C₁）/(J·(kg·K)^–1)	385
导体屏蔽层	半导体混合物	厚度/半径（D₁）/μm	0.85
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	2
		相对介电常数（ε₁）	2.25
		导热系数（y₁）/(W·(m·K)^–1)	10
		密度（rho₁）/(kg·m^–3)	1055
		恒压热容（C₁）/(J·(kg·K)^–1)	2405
绝缘层	交联聚乙烯	厚度/半径（D₁）/mm	19.5
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	10^–18
		相对介电常数（ε₁）	2.5
		导热系数（y₁）/(W·(m·K)^–1)	0.46
		密度（rho₁）/(kg·m^–3)	930
		恒压热容（C₁）/(J·(kg·K)^–1)	2302
绝缘屏蔽层	半导体混合物	厚度/半径（D₁）/μm	0.85
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	2
		相对介电常数（ε₁）	2.25
		导热系数（y₁）/(W·(m·K)^–1)	10
		密度（rho₁）/(kg·m^–3)	1055
		恒压热容（C₁）/(J·(kg·K)^–1)	2405
金属层	铝	厚度/半径（D₁）/mm	2.50
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	3.774×10⁷
		相对介电常数（ε₁）	1
		导热系数（y₁）/(W·(m·K)^–1)	238
		密度（rho₁）/(kg·m^–3)	2700
		恒压热容（C₁）/(J·(kg·K)^–1)	900
外护层	聚乙烯	厚度/半径（D₁）/mm	2.90
		相对磁导率（W₁）	1
		电导率（S₁）/(S·m^–1)	10^–18
		相对介电常数（ε₁）	2.5
		导热系数（y₁）/(W·(m·K)^–1)	0.46
		密度（rho₁）/(kg·m^–3)	935
		恒压热容（C₁）/(J·(kg·K)^–1)	2302

过渡电阻/Ω	特征电压/kV	故障位置	功率 Q_f/kW	检测值		检测精度 (Q_f–Q)/Q_f	结果
过渡电阻/Ω	特征电压/kV	故障位置	功率 Q_f/kW	Q/kW	x/rad	检测精度 (Q_f–Q)/Q_f	结果
1000	1.0	B	5.30	5.240	0.15	1.13%	√
1000	2.0	C	8.60	7.370	1.61	14.30%	√
2000	0.5	D	1.50	1.350	2.88	10.00%	√
2000	1.0	E	2.80	2.620	3.50	6.43%	√
4000	2.0	D	2.30	2.080	2.88	9.56%	√
4000	4.0	E	2.50	2.350	3.52	6.00%	√
6000	0.3	D	0.36	0.355	2.94	1.69%	√
6000	0.5	E	0.51	0.520	3.49	2.10%	√
7000	0.3	D	0.31	0.320	3.40	3.20%	√
7000	0.5	E	0.44	0.464	3.41	5.64%	√
8000	0.4	C	0.30	0.278	1.47	7.33%	×
8000	1.0	D	0.69	0.640	2.67	8.33%	√