发电机电容电流的测量及数据分析.pdf

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1、发电机电容电流的测量及数据分析摘要：凌津滩电厂装机9 台，总容量 27 万千瓦，是我国大容量、灯泡式贯流式机组的电厂。其中#1#5 机组为日立公司生产，#6#9 机组为日立设计哈尔滨电机厂生产。单机容量为 30MW，额定电压，发电机中性点不接地。关键字：发电机电容电流测量 数据分析0 前言凌津滩电厂装机9 台，总容量 27 万千瓦，是我国大容量、灯泡式贯流式机组的电厂。其中#1#5机组为日立公司生产，#6#9 机组为日立设计哈尔滨电机厂生产。单机容量为 30MW，额定电压，发电机中性点不接地。根据凌津滩电厂水轮发电机组及其附属设备合同：1）第中第 2 条中性点装置第3 项中规定：两台机联合运行

2、，单相接地电容电流大于3A时，若不能保证机组安全运行2 小时，则各机组中性点均应采取补偿措施，补偿装置由卖方配套供货。2）附件条设备性能保证及参数中规定：定子绕组每相对地电容F。3）第条规定现场试验：条定子对地电容电流测量。这一条明确规定与电机交流耐压并列，即每台机都应作电容电流测量。1 发电机电容的计算凌津滩电厂发电机定子绕组为波绕双层、每槽两根线棒，定子线棒采用真空压力浸渍环氧树脂浸透线圈、线圈表面涂阻燃林料，分上下层嵌放到定子槽内。定子Z=342槽、计 684根线棒，单支路每相线棒N=228根。定子绕组对地电容，由线圈的机械尺寸、绝缘材料的电介系数所确定。按机械尺寸、交流耐压及单相接地三

3、种方法可计算得出，以#1 机为例，分述如下。11 机械尺寸进行电容的计算一般的平板极电容计算，电容与电介系数O及 r、极板面积 S 成正比，与极间距离d 成反比。常用式子C0=OrSd发电机的绕组电容计算，可将线棒导体展开成为一极。包有半导体材料的线棒与铁芯是紧靠的，当另外一极同时展开。中间的绝缘材料也展开，这是极板间的介质。线棒导体的面积S1=（2b1+2h1）L包半导体的面积 S2=(2b2+2h2)L 电容极板的一侧 S=(S1+S2)/4=(b1+h1+b2+h2)L/2 绝缘的单边厚度 d=(b2-b1)/2 一根线棒的电容 C0=由日立公司提供单根线棒的断面尺寸如图1。定子铁心长度

4、包括通风沟 L=165cm。文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V

5、4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9

6、Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10

7、E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T

8、1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5

9、C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V

10、10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4多股裸线棒一根截面尺寸 h1b1=包绝缘后的尺寸 h2b2=环氧粉云母相对介质系数r=46、取 r=5 图 1 定子导线的尺寸空气中的电气介质常数为O=1/18105、一根线棒电容 C0=F单相电容为 C1=NC0=228=F三相电容为

11、 C=3C1=3=F12 由交流耐压电流计算电容发电机定子交流耐压的常规方式是：三相分别耐压，而非加压相短接后与定子铁芯一同接地，这时耐压的电容实际为定子的三相电容。发电机定子的交流耐压电流主要是按电容分布，线棒导体为电容的一极，另外一极为定子铁心，也是接地极。耐压电流中还有极少的线棒绝缘电阻电流但它和电容电流相比也是很小的。如：摇得一相线棒 228根绝缘为 10M，如果电容为 F，则容抗 XC=1/2fC=106/314=M文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编

12、码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4

13、 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5

14、 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文

15、档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6

16、L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6

17、J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V

18、4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4绝缘RS=10 M比值 XC/RS=10=%因此在下面的计算中我们忽略电阻部分有功电流，近似地认为交流耐压即是定子的三相电容。于是交流耐压的电流 IC=U/XC=2fCU三相电容 C=IC/2 fU单相电容 Cn=C/3原#1 机的定子耐压的厂家出厂试验、安装单位交接试验具体数值及计算电容如表1表 1资料来源厂家日立公司安装交接平均电压（KV）24 18 7电流（A）5 52 4 5单相电容(F)0 732 0 766 0 749

19、三相电容(F)2 196 2 298 2 247一根线棒电容(F)000321 0 00336 0 0032913 单相接地测量电容文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5

20、 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文

21、档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6

22、L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6

23、J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V

24、4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9

25、Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4单相接地电容电流的测量原理假设三相电压以 A相电压为基准，且电压最大值为1，那么正常情况发电机三相的电压可表示如下：=00=2400

26、=1200因为三相对地存在电容，所以即便是空载发电机三相也存在微弱的电流，且分别超前电压900，和电压一样是对称，见图1。如果容抗为 1，那么可表示为：=900=-300=2100（a）线路图（b）电压电流向量图图 1 正常状态三相电容电流当 C相接地时，因 C相的电压为零，此时A、B相对地的电压等于对C相的电压，即正常时的线电压。所以此时的三相电压为=0=00-1200=-300=2400-1200=-900可见非接地相对地的电压上升为正常倍，因为是中性点不接地系统，所以短路电流如图2(a)所示经 A、B对地电容、大地与C相形成回路。A、B对地的容抗不变，因对地电压升高倍，所以 A、B相的电

27、流数值分别比正常时升高倍，仍超前电压900，分别为=/1=600=/1=00而 C三相电流为 A、B相电流之和，且方向相反，见图2(b)。=-（+）=32100 文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6

28、L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6

29、J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V

30、4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9

31、Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10

32、E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T

33、1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4C相电流即为单相短路的总接地电流，为正常情况下单相电容电流的3 倍，由这个电流计算出的电容即为三相电容

34、。（a）线路图（b）电压电流向量图图 2 单相接地的电容电流132 半电压下的接地试验在#1 发电机的出口母线上C相接地，现地分布开机，手动励磁，升到半电压=2887=5000V。用晶体管钳式电流表夹到接地线上测量，使用的表计最小档位为200A档，读出的电流数为，根据接地电流IC=U/XC=2fCU三相电容C=IC/2 fU=(3142887)=F单相电容Cn=C/3=3=F一根线棒电容 C0=C/2Z=F133 全电压下单相接地试验发电机在额定电压下发生单相接地，因发电机对地电容不变，所以其接地电流应是半电压下的 2 倍。实际测的电流为 A，与半电压下的试验数据比较相符。2 电容及单相接地电

35、流的分析对于中性点不接地发电机，如果电容电流过大，容易损坏绕组对定子铁芯的绝缘而形成常见的单相接地故障，若不及时发现，又出现另一接地点，就会造成匝间或相间短路，使发文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y

36、6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E

37、6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1

38、V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C

39、9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V1

40、0E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7

41、T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4电机受到更严重的破坏。所以，在我国，系统中性点不接地发电机的单相接地电流要求小于 35A。对于水轮机

42、则要求小于3A。而#1 机在全电压单相接地试验中的接地电流已有。另外，#1 发电机由机械尺寸计算和半电压单相接地方法所得单相电容值F 相符合。而日立公司的出厂试验数据所得电容值单相电容值F 和安装单位的交流耐压试验数据所得电容值单相电容值F 偏小，考虑到测量仪器的不同及误差，可做参考。但所有这些数据都远大于凌津滩电厂水轮发电机组及其附属设备合同附件条设备性能保证及参数中规定：定子绕组每相对地电容F。表 2 列出了#1#4 安装单位交流耐压试验后电容电流（取自接地线）以及计算出的单相电容，其中#1 机为转子阻尼条烧损事故后，磁极重装后的数据。表 2相别ABC平均#1机I（A）文档编码:CB7A5

43、C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V

44、10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K

45、7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7

46、A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K

47、6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E

48、8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:C

49、B7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4C （F）#2机I（A）42444343文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V

50、4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9Y6L4 HV1K6V10E6J5 ZZ1E8K7T1V4文档编码:CB7A5C9