HFCT高频电流局放在线监测装置使用说明书

高频电流局放在线监测装置高频电流局放在线监测装置高频电流局放在线监测装置使用说明书杭州辉能电力技术有限公司二〇二〇年九月一、概述高频局部放电检测方法是用于电力设备局部放电缺陷检测与定于的常用测3-30MHz其高频脉冲电流信号由电感式耦合传感器进行耦合。（HighFrequencyCurrent简称电流信号进行检测。高频局放检测技术的技术优势：1、可进行局部放电强度的量化描述2、具有便于携带、方便应用、性价比高等优点3、检测灵敏度较高，高频电流传感器一般由环形铁氧体磁芯构成，铁氧体配合经磁化处理的陶瓷材料，对于高频信号具有很高灵敏度，局部放电发生后，放电脉冲电流将沿着接地线的轴向方向传播，即会在垂直于电流传播方向的平面上产生磁场，电感型传感器是从该磁场中耦合放电信号。二、产品原理高频电流传感器其有效的频率监测范围一般为3-30MHz，由于所测量的局部放电信号是微弱高频电流信号，传感器需要在较宽的频带内有较高的灵敏度，因此HFCT选用高磁导率的磁芯作为线圈骨架。数据处理终端，高频局部放电监测装置结构框图如下图所示。1、传感器

图1：系统结构框图高频局部放电监测HFCT传感器按安装位置不同主要分为接地线HFCTHFCTHFCT测试安装和拆卸，可以使用一个传感器对设备多个位置进行测量。2、信号处理单元号信噪比的目的。3、信号采集单元将实际采集到的模拟信号转换为可供进一步处理的数字信号。4、数据处理终端将实际采集到的数字信号经过进一步的算法处理，通过网口或RS485通讯接口，将数据上传到终端显示平台进行显示。三、产品功能1、性能指标适用范围电流电缆、变压器供电电压220AC使用寿命大于5年通道数3路HFCT信号采集通讯方式RS-485安装方式卡扣式安装检测原理HFCT测量范围-80--20dbm分辨率1dbm频率带宽3-30MHz2、安装位置说明图2：变压器类设备安装位置图3：电容性设备及避雷器设备安装位置图4：电力电缆及附件四、实物照片4.1特高频局放传感器图5：高频电流传感器图6：局放处理主机五、通讯协议本文档定义高频电流局放在线监测装置通讯讯协议规范，该协议以ModbusRS485与设备对接二、读寄存器状态协议RS485波特率：9600bps数据位：8停止位：1奇偶校验：无RTS/DTR:无轮询间隔：大于200ms数据通讯协议通讯帧格式定义命令帧：上位机发送给终端的数据格式，即读取数据时，发送给终端的命令字，终端解析命令字后，上传相关数据。数据帧：终端发送给上位机的数据格式命令帧格式：说明字节数备注设备地址1下位机设备的地址功能码1各种命令的标识HI1要读的寄存器的起始地址的高地址开始地址LO1要读的寄存器的起始地址的低地址要读的寄存器所占的字节长度1要读的寄存器所占的字节长度的高要读的寄存器所占的字节长度1要读的寄存器所占的字节长度的低错误校验码LO1错误校验码的低字节HI1错误校验码的高字节数据帧格式：说明字节数备注设备地址1下位机设备的地址功能码1各种命令的标识返回有效数据长1下位机返回有效数据长度返回有效数据寄存器数*2下位机返回的各个寄存器对应的值错误校验码LO1错误校验码的低字节HI1错误校验码的高字节命令字功能码定义（2节为低位比特命令字：03功能：读取局放相关数据例：上位机发送命令帧如下：010300000005XXXX命令帧解析：01：设备地址0103：功能码，读取局放相关数据00 00：读寄存器的起始地址0x000000 05：读寄存器个数，0x0005，读5个寄存器的数XX XX：CRC校验码数据帧响应数据如下：0103000A0x05*2=10字节XXXX数据帧解析如下：01：设备地址0103：功能码，读取局放相关数据有效数据长度：000A （读寄存器个数*2字节有效数据：（寄存器数*2）个数据CRC校验码：xxxx寄存器数据解析在后。地址类型数据类型备注第1通道HFCT数据0x0000采样均值短整型（2字节）乘以-1（dbm）0x0001采样峰值短整型（2字节）乘以-1（dbm）0x0002峰值相位短整型（2字节）乘以360/64（°）0x0003保留短整型（2字节）默认为00x0004故障预警等级短整型（2字节）预警等级：0：设备运行正常（疑似局放2：持续关注3：重点关注0x0005……0x0044采样图谱短整型（2字节）64*2=128第2通道HFCT数据0x0045采样均值短整型（2字节）乘以-1（dbm）0x0046采样峰值短整型（2字节）乘以-1（dbm）0x0047峰值相位短整型（2字节）乘以360/64（°）0x0048保留短整型（2字节）默认为00x0049故障预警等级短整型（2字节）预警等级：0：设备运行正常（疑似局放2：持续关注3：重点关注0x004A……0x0089采样图谱短整型（2字节）64*2=128第3通道HFCT数据0x008A采样均值短整型（2字节）乘以-1（dbm）0x008B采样峰值短整型（2字节）乘以-1（dbm）0x008C峰值相位短整型（2字节）乘以360/64（°）0x008D保留短整型（2字节）默认为00x008E故障预警等级短整型（2字节）预警等级：0：设备运行正常（疑似局放2：持续关注3：重点关注0x008F……0x00CE采样图谱短整型（2字节）64*2=128附录：CRC校验算法c代码：uint16_tMODBUS_CRC(uint8_t*p,uint16_tn){uint8_t i;uint8_tR0=0xff; //SetCRC16Highuint8_tR1=0xff; //SetCRC16Lowdo{ i=*p^R1;p++;R1=R0^CRC_TABLE_H[i];R0=CRC_TABLE_L[i];}while(--n!=0);return(R0*256+R1);}uint8_tCRC_TABLE_H[256]= //High{0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,};uint8_tCRC_TABLE_L[256]= //Low{0x00,0xC0,0xC1,0x01,0xC3,0x03,0x02,0xC2,0xC6,0x06,0x07,0xC7,0x05,0xC5,0xC4,0x04,0xCC,0x0C,0x0D,0xCD,0x0F,0xCF,0xCE,0x0E,0x0A,0xCA,0xCB,0x0B,0xC9,0x09,0x08,0xC8,0xD8,0x18,0x19,0xD9,0x1B,0xDB,0xDA,0x1A,0x1E,0xDE,0xDF,0x1F,0xDD,0x1D,0x1C,0xDC,0x14,0xD4,0xD5,0x15,0xD7,0x17,0x16,0xD6,0xD2,0x12,0x13,0xD3,0x11,0xD1,0xD0,0x10,0xF0,0x30,0x31,0xF1,0x33,0xF3,0xF2,0x32,0x36,0xF6,0xF7,0x37,0xF5,0x35,0x34,0xF4,0x3C,0xFC,0xFD,0x3D,0xFF,0x3F,0x3E,0xFE,0xFA,0x3A,0x3B,0xFB,0x39,0xF9,0xF8,0x38,0x28,0xE8,0xE9,0x29,0xEB,0x2B,0x2A,0xEA,0xEE,0x2E,0x2F,0xEF,0x2D,0xED,0xEC,0x2C,0xE4,0x24,0x25,0xE5,0x27,0xE7,0xE6,0x26,0x22,0xE2,0xE3,0x23,0xE1,0x21,0x20,0xE0,0xA0,0x60,0x61,0xA1,0x63,0xA3,0xA2,0x62,0x66,0xA6,0xA7,0x67,0xA5,0x65,0x64,0xA4,0x6C,0xAC,0xAD,0x6D,0xAF,0x6F,0x6E,0xAE,0xAA,0x6A,0x6B,0xAB,0x69,0xA9,0xA8,0x68,0x78,0xB8,0xB9,0x79,0xBB,0x7B,0x7A,0xBA,0xBE,0x7E,0x7F,0xBF,0x7D,0xBD,0xBC,0x7C,0xB4,0x74,0x75,0xB5,0x77,0xB7,0xB6,0x76,0x72,0xB2,0xB3,0x73,0xB1,0x71,0x70,0xB0,0x50,0x90,0x91,0x51,0x93,0x53,0x52,0x92,0x96,0x56,0x57,0x97,0x55,