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2.10 熱穩(wěn)定及動(dòng)穩(wěn)定倍數(shù)：電力系統(tǒng)故障時(shí)，電流互感器受到由于短路電流引起的巨大電流的熱效應(yīng)和電動(dòng)力作用，電流互感器應(yīng)該有能夠承受而不致受到破壞的能力，這種承受的能力用熱穩(wěn)定和動(dòng)穩(wěn)定倍數(shù)表示。熱穩(wěn)定倍數(shù)是指熱穩(wěn)定電流1s內(nèi)不致使電流互感器的發(fā)熱超過允許限度的電流與電流互感器的額定電流之比。動(dòng)穩(wěn)定倍數(shù)是電流互感器所能承受的最大電流瞬時(shí)值與其額定電流之比。 ATT7053BU www.dzsc.com/ic-detail/9_14658.html驅(qū)動(dòng)代碼 //我們的SPI速度最高可以達(dá)到1.5M左右 //需要注意的是每次CS拉低啟動(dòng)傳輸，需要給2-3us的延時(shí)時(shí)間。 //CS拉高結(jié)束數(shù)據(jù)傳輸之前也需要給出2-3us的延時(shí)時(shí)間void Delay(unsigned int time) //一個(gè)控制信號(hào)高電平低電平時(shí)間的延時(shí){int i; for(i=0; i unsigned long SPI_Read(unsigned char address){int i; unsigned long temp_data; temp_data = 0; SPI_CLK_LOW; //確保CLK初始狀態(tài)是0 Delayus(1); SPI_CS_HIGH; Delayus(2); SPI_CS_LOW; Delayus(5); SPI_CLK_HIGH; //啟動(dòng)數(shù)據(jù)傳輸 Delayus(1); SPI_DIN_LOW; //0表示主機(jī)向從機(jī)讀數(shù)據(jù)Delayus(1);SPI_CLK_LOW; //從機(jī)需要在下降沿取數(shù)據(jù)Delayus(1);for(i=6; i>=0; i--) { SPI_CLK_HIGH; //啟動(dòng)數(shù)據(jù)傳輸 Delayus(10); if( (address& (0x01< } else SPI_DIN_LOW; Delayus(1); SPI_CLK_LOW; //從機(jī)需要在下降沿取數(shù)據(jù)Delayus(10);} SPI_CLK_HIGH; Delayus(10); SPI_CLK_LOW; if(READ_SPI_DOUT) temp_data = temp_data | 1; Delayus(2); //從機(jī)接收到命令后，開始送出數(shù)據(jù)，上升沿送數(shù)據(jù)for(i=0; i<23; i++){ SPI_CLK_HIGH; Delayus(10); SPI_CLK_LOW; Delayus(10); temp_data = temp_data<<1; if(READ_SPI_DOUT) temp_data++; Delayus(1); } SPI_CS_HIGH; return temp_data; } void SPI_Write(unsigned char address, unsigned long write_data){int i; unsigned long temp_data; temp_data = 1; SPI_CLK_LOW; //確保CLK初始狀態(tài)是0 Delayus(100); SPI_CS_HIGH; Delayus(50); SPI_CS_LOW; Delayus(100); SPI_CLK_HIGH; //啟動(dòng)數(shù)據(jù)傳輸 Delayus(10); SPI_DIN_HIGH; //1表示主機(jī)向從機(jī)寫數(shù)據(jù)Delayus(10);SPI_CLK_LOW; //從機(jī)需要在下降沿取數(shù)據(jù)Delayus(10);for(i=6; i>=0; i--) { SPI_CLK_HIGH; //啟動(dòng)數(shù)據(jù)傳輸 Delayus(10); if((address & (0x01< { SPI_DIN_HIGH; } else SPI_DIN_LOW; Delayus(10); SPI_CLK_LOW; //從機(jī)需要在下降沿取數(shù)據(jù)Delayus(10);} //從機(jī)接收到命令后，開始送出數(shù)據(jù)，上升沿送數(shù)據(jù)Delayus(40);for(i=23; i>=0; i--) { SPI_CLK_HIGH; //啟動(dòng)數(shù)據(jù)傳輸 Delayus(10); if((write_data & (temp_data< { SPI_DIN_HIGH; } else SPI_DIN_LOW; Delayus(10); SPI_CLK_LOW; //從機(jī)需要在下降沿取數(shù)據(jù)Delayus(10);} SPI_CS_HIGH; } void ATT7053_Init(void) { SPI_Write(0x32, 0xBC); //Open written-protect 只能操作 40H 到 45H 的校表參數(shù)寄存器SPI_Write(0x43, 0xFA); //I1 ADC Enable// SPI_Write(0x43, 0xDF); //close borSPI_Write(0x42, 0x01FF); //I1Angle Enable, I2Angle EnableSPI_Write(0x32, 0xA6); //Open written-protect 只能操作 50H 到 71H 的校表參數(shù)寄存器SPI_Write(0x59, 0x0001); //模擬通道增益I1*2Delayms(10);SPI_Read(0x06); } |
