电压继电器引起变电站失电问题分析
郭志
Analysis of Substation Outage Caused by Voltage Relays
GUO Zhi
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作者信息:上海地铁维护保障有限公司供电分公司， 200235， 上海
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Affiliation:Power Supply Branch of Shanghai Rail Transit Maintenance Support Co., Ltd., 200235, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20250143
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中图分类号/CLCN:U224
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栏目/Col:供电与能源
摘要:
［目的］针对城市轨道交通变电站运行过程中发生的变电站电源失电问题进行分析，找到引起失电的关键部件，解决关键部件引起变电站失电的安全隐患。［方法］通过分析变电站电源失电故障原因，指出电压继电器是引起变电站失电故障的关键部件。研究400 V配电柜内低电压检测继电器内部电路工作原理，对该内部电路存在问题的部分进行参数计算；根据计算结果论证关键部件工作异常的原因，结合原因分析提出内部电路优化方案；对优化后的内部电路进行分析和检测，验证该电压继电器的可靠性。［结果及结论］对电压继电器内部电路进行优化后，有效地避免了变电站400 V开关柜内部二次检测电路故障造成的开关误动作；对电压继电器检测和逻辑判断电路，需设计电气隔离，以提高检测电路在不同运行条件下的可靠性，确保检测部件对不同运行工况的适应性。
Abstracts:
［Objective］ Analysis is carried out targeting the power outage issues occurring during the operation of urban rail transit substations, the key components causing power failure are identified, and the safety hazards leading to substation power outages caused by these critical components are addressed. ［Method］ By analyzing the causes of power outage in substations, it is pointed out that the voltage relays are the key components leading to substation power failure. The internal circuit working principle of the low voltage detection relay in a 400 V distribution box is examined, and parameters of the internal circuit problematic parts are calculated. The reasons for abnormal operation of key components are argued based on the calculation results. Based on the cause analysis, an internal circuit optimization scheme is proposed. The optimized internal circuit is then analyzed and tested to verify the reliability of the voltage relay. ［Result & Conclusion］ After optimizing the voltage relay internal circuit, maloperation caused by secondary detection circuit failures inside the substation 400 V switchgear cabinet is effectively avoided. The detection and logic judgment circuits of the voltage relay should be designed with electrical isolation, aiming to enhance reliability of the detection circuit in various operating scenarios, ensuring the adaptability of detection components to different working conditions.
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