Power Equipment Risk Assessment Based on Health and Importance

doi:10.11985/2020.04.018

Abstract

Abstract:

Because of the uncertainty of power grid accidents and the serious consequences of accidents, it is necessary to establish a risk model and an evaluation system to realize the risk assessment of power equipment. In order to provide useful equipment operation information for safety risk management and control, a risk assessment method of power equipment based on health degree and importance is proposed. Firstly, a health model of equipment is constructed based on the operating status and operating limits of electrical and non-electrical parameters of power equipment, and health index of equipment parameters as well as comprehensive health index are proposed. Then, the importance model composed of the important factors involved in the operation of the equipment is used to characterize the severity of the consequences of abnormal operation of the equipment. Risk assessment system integrates and improves the health and importance of power equipment operation. Taking the data of a certain substation equipment as an example to carry out simulation experiments to verify the applicability of the proposed method. The experimental results show that the method can effectively evaluate the potential risk of equipment and improve the reliability and safety of power supply.

Key words: Health, importance, power equipment, risk assessment

CLC Number:

TM715

MA Qingshan, SUN Yuwei, DENG Weichao, YU Xinchun, ZHU Jianbao, WANG Zhongyi. Power Equipment Risk Assessment Based on Health and Importance[J]. Journal of Electrical Engineering, 2020, 15(4): 144-152.

Figures/Tables 18

References 23

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设备	监测参数
电容性绝缘设备	介质损耗因数tanδ、电容值和电流值
避雷器	泄漏电流中的阻性电流、温度、湿度
电缆	介质损耗因数tanδ、电容电流、电缆接头温度、局部放电量
变压器	溶解的气体含量、局部放电量、温度、电动机电流、油含水量
绝缘子	绝缘电阻、泄漏电流、分布电压、脉冲电流
GIS及高压断路器	温度、SF₆气压、灭弧室真空度、分合闸线圈电流、机械振动、触头反应时间及速度

特性	断路器类型	主要故障部位	主要监测参量
CB#3	电源断路器	触头、锁扣、辅助触头	温度、分合闸线圈电流、分合闸速度及时间、压力
CB#7	变压器断路器	不完整的高压开关	机械行程、机械振动
CB#15	线路断路器	锁扣、不完整开关	分合闸时间、线圈电流、机械振动、机械行程
CB#19	母线断路器	锁扣、辅助触头、其他机械	分合闸时间及速度、压力、温度、机械振动

断路器	影响因子	权重	影响因子等级	重要等级
CB#3	负荷数量因子	3	4	3.95
	负荷等级因子	2	4
	社会影响因子	2	4
	设备因子	1	3
CB#7	负荷数量因子	3	4	3.75
	负荷等级因子	2	4
	社会影响因子	2	3
	设备因子	1	3
CB#15	负荷数量因子	3	2	2.00
	负荷等级因子	2	2
	社会影响因子	2	2
	设备因子	1	2
CB#19	负荷数量因子	3	4	3.74
	负荷等级因子	2	4
	社会影响因子	2	3
	设备因子	1	3

断路器	风险指标	风险等级
CB#3	健康度	2.5
CB#3	重要度	3.95
CB#7	健康度	1.0
CB#7	重要度	3.75
CB#15	健康度	1.6
CB#15	重要度	2.00
CB#19	健康度	1.6
CB#19	重要度	3.74