基于能量管理系统数据的电容式电压互感器二次电压在线监测在绝缘诊断中的应用
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摘要
通过电容式电压互感器(CVT)二次电压变压情况与其绝缘状态的关系,结合能量管理系统(EMS)中所包含的CVT二次电压的数据,提出了基于EMS数据的CVT二次电压的在线监测方法。利用该方法发现某220 kV变电站220 kV雷平甲线存在CVT二次电压异常现象,结合停电检查、解体前复测、解体分析等方法找出了引起该CVT二次电压下降的原因。结果表明:通过对运行中的CVT开展基于EMS数据的二次电压在线监测,并根据二次电压曲线波动情况结合CVT的停电检查,能够有效发现CVT内部电容单元的绝缘故障。
According to the relationship between the secondary voltage variation of capacitor voltage transformer(CVT) and its insulation state, combining the secondary voltage data of CVT in the energy management system(EMS), an on-line monitoring method of the secondary voltage of CVT based on EMS data was proposed. An abnormal phenomenon of the CVT secondary voltage on the 220 k V Lei Ping Jia line in a 220 kV substation was checked out using this method, and then the reason for the reduction of CVT secondary voltage was found out combining with power outage checking, retest before disintegration, and disintegration analysis. The results show that the insulation failure in the CVT capacitor unit can be detected effectively by online monitoring the CVT secondary voltage based on EMS data and combining power outage checking according to the fluctuation of the secondary voltage curves.
According to the relationship between the secondary voltage variation of capacitor voltage transformer(CVT) and its insulation state, combining the secondary voltage data of CVT in the energy management system(EMS), an on-line monitoring method of the secondary voltage of CVT based on EMS data was proposed. An abnormal phenomenon of the CVT secondary voltage on the 220 k V Lei Ping Jia line in a 220 kV substation was checked out using this method, and then the reason for the reduction of CVT secondary voltage was found out combining with power outage checking, retest before disintegration, and disintegration analysis. The results show that the insulation failure in the CVT capacitor unit can be detected effectively by online monitoring the CVT secondary voltage based on EMS data and combining power outage checking according to the fluctuation of the secondary voltage curves.
引文
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[17]杜林,陈斌,陈贤顺,等.内绝缘参量对电容式电压互感器计量精度的影响分析[J].电网技术,2016,40(12):3958-3965.
[2]侍海军,汪飞,连振东.电容式电压互感器故障实例及分析[J].江苏电机工程,2009,28(4):14-16.
[3]邢立坤,李国伟,王俊波,等.一起110kV CVT红外异常的诊断分析[J].电力电容器与无功补偿,2015,36(1):68-72.
[4]何建,余睿,杨漪俊.电容式电压互感器常见故障及监测[J].电力电容器与无功补偿,2009,30(5):38-42.
[5]严玉婷,倪学锋,江健武,等.污秽电阻对CVT测量准确性影响的理论分析和试验研究[J].高压电器,2009,45(2):62-69.
[6]陈化钢.电气设备预防性试验方法[M].北京:中国水利水电出版社,1994.
[7]彭庆华,陈龙,康文斌,等.电容式电压互感器谐波测量误差分析高电压技术[J].高电压技术,2015,41(3):956-962.
[8]凌子恕.高压互感器技术手册[M].北京:中国电力出版社,2006:38-93.
[9]严金云,方志,钱晨,等.不同电极结构介质阻挡放电特性比较[J].绝缘材料,2014,47(5):110-115.
[10]李振.电子式电压互感器结构参数的优化[D].哈尔滨:哈尔滨工业大学,2008.
[11]冯宇,王晓琪,陈晓明,等.电容式电压互感器电路参数对电网谐波电压测量的影响[J].中国电机工程学报,2014,34(28):4968-4975.
[12]刘利,方志.电源频率对介质阻挡放电参量影响的研究[J].绝缘材料,2010,43(2):65-69.
[13]贺满潮,张建平,赵江涛.温度变化对CVT准确度的影响[J].电力电容器与无功补偿,2006,27(1):13-17.
[14]王德忠,王季梅.电容式电压互感器误差特性的研究[J].高压电器,2001,37(1):5-9.
[15]邱太洪,罗容波,李国伟,等.电容式电压互感器二次电压在线监测在故障检测分析中的应用[J].变压器,2015,52(9):70-73.
[16]张曦,周文华,吴悦怡,等.电压测量值在电容式电压互感器故障检测中的应用[J].江苏电机工程,2011,30(3):19-24.
[17]杜林,陈斌,陈贤顺,等.内绝缘参量对电容式电压互感器计量精度的影响分析[J].电网技术,2016,40(12):3958-3965.