RET650_差动测试.doc

RET650定值清单及静态测试报告 2009/12/191. 差动保护1.1差动定值相关清单配置部分_全局基准定值,装置名牌, 差动定值Power systemPrimary values注释定值单位整定范围PRIMVAL: 1Frequency频率50.0Hz50.060.0PhaseRotation相序Normal=L1L2L3Global base valuesGBASVAL: 1基准组1UBase基准电压220.00kV0.052000.00IBase基准电流328A199999SBase基准容量125MVA150000GBASVAL: 2UBase110.00kV0.052000.00IBase656A199999SBase125MVA150000GBASVAL: 3UBase11.00kV0.052000.00IBase1575A199999SBase30MVA150000GBASVAL: 4UBase132.00kV0.052000.00IBase1000A199999SBase229MVA150000GBASVAL: 5UBase132.00kV0.052000.00IBase1000A199999SBase229MVA150000GBASVAL: 6UBase132.00kV0.052000.00IBase1000A199999SBase229MVA150000Identifiers装置标识TERMINALID: 1StationName厂站名称ABB18 character(s)StationNumber0099999ObjectName设备名称RET650-A0518 character(s)ObjectNumber0099999UnitName继电器名称RET65018 character(s)UnitNumber0099999Application Configuration应用功能DIFF_PROT差动保护Differential注释定值单位整定范围T3WPDIF: 1GlobalBaseSelW1W1基准选择116GlobalBaseSelW2W2基准选择216GlobalBaseSelW3W3基准选择316ConnectTypeW1W1接线方式WYE (Y)ConnectTypeW2W2接线方式WYE (Y)ConnectTypeW3W3接线方式Delta (D)ClockNumberW2W2钟点数0 0 degClockNumberW3W3钟点数11 30 deg leadZSCurrSubtrW1W1零流消除OnZSCurrSubtrW2W2零流消除OnZSCurrSubtrW3W3零流消除OnOperation投退控制OnIdMin最小动作电流0.30IB0.050.60EndSection1拐点11.25IB0.201.50EndSection2拐点23.00IB1.0010.00SlopeSection2斜率240.0%10.050.0SlopeSection3斜率380.0%30.0100.0IdUnre差速断电流10.00IB1.0050.00I2/I1Ratio二次谐波制动系数15.0%5.0100.0I5/I1Ratio五次谐波制动系数25.0%5.0100.0CrossBlockEn交叉闭锁投退OnNegSeqDiffEn负序判别元件投退OnIMinNegSeq负序元件门槛电流0.10IB0.020.20NegSeqROA负序元件动作角60.0Deg30.090.0SOTFModeSOTF投退OffIDiffAlarm差流告警定值0.08IB0.051.00tAlarmDelay差流告警延时10.000s0.00060.000配置部分的CT变比如下：W1 6001A；W2 10001A；W3 20001A，所有CT接地点指向设备（极性指向各侧母线）；W1中性点CT变比为6001A (EFPTOC1, EFPIOC1)，二次额定为1A配置部分的PT变比如下：W1 2200.1kV；W2 1100.1kV；W3 11.00.1kV，W2中性点PT变比为110/0.1kV(ROVPTOV)，二次额定为100V。 附录: 差动动作电流值计算IdMin= 30%IB（IB为HV额定电流，LV侧为折算到与HV等容量的电流）各侧二次额定电流:W1 side. Ir 2= 328A/600=0.547AW2 side. Ir 2=656A/1000=0.656AW3 side. Ir 2= 1575A/2000=0.788A差动电流计算公式(说明书) ( W1-HV Y-connection; W2 Delta-Connection “ZSCSUB=On” )根据公式 3：假定三相短路，差动动作电流计算：Y side: IDL1 =(1/3)*(2IL1_W1- IL2_W1 IL3_W1) = IL1_W1Delta side: IDL1 =(1/1.732)*(-IL1_W3+ IL3_W3) = IL1_W1三相短路各侧的动作电流： Isec.w1.3ph = (Sr1/Sr1)*Ir.w1 * 0.3 / 600 =0.164A; (W1) Isec.w2.3ph = (Sr1/Sr2)*Ir.w2 * 0.3 / 1000=0.1968A; (W2) Isec.w3.3ph = (Sr1/Sr3)*Ir.w3* 0.3 / 2000=(12.5/3)*0.788*30%=0.984A. (W3)假定两相短路，差动动作电流计算： Y side: IL1_W1=IDL1Delta side: 2/1.732*IL1_W1= IDL1 then IL1_W2=0.866*IDL1两相短路，各侧的动作电流：（Y侧与三相短路电流相同，三角形侧缩小到0.866倍）.Isec.w1.2ph= Isec.w1.3ph = 0.164A; Isec.w2.2ph= Isec.w2.3ph = 0.1968A; Isec.w3.2ph= Isec.w3.3ph*0.866 = 0.852A.假定单相短路，差动动作电流计算：Y side: (2/3)*IL1_W1=IDL1then L1_W1=1.5*IDL1Delta side:(1/1.732)IL1_W1=IDL1 then L1_W1=1.732*IDL1单相短路，各侧的动作电流：（Y侧是三相短路的1.5倍，三角形侧扩大到1.732倍） Isec.w1.1ph= Isec.w1.3ph*1.5 = 0.246A; Isec.w2.1ph= Isec.w2.3ph*1.5 = 0.295A; Isec.w3.1ph= Isec.w3.3ph*1.732 = 1.704A.*在差动保护的定值项 “ZSCSUB=Off”时，Y侧单相故障动作电流与三相故障时一样;三角形侧不影响。1.2差动动作值Id.Min测试* W1:HV ,W2:MV, W3:LV故障相 计算值 测试值HVMVLVHVMVLVZSCurrSubtrOnOnOnOnOnOnA0.2460.2951.7040.2460.2941.694B0.2460.2951.7040.2460.2941.694C0.2460.2951.7040.2450.2941.692AB0.1640.1970.8520.1640.1960.848BC0.1640.1970.8520.1640.1960.848CA0.1640.1970.8520.1640.1960.846ABC0.1640.1970.9840.1640.1960.980故障相 计算值 测试值HVMVLVHVMVLVZSCurrSubtrOffOffOffOffOffOffA0.1640.1971.7040.1640.1981.696B0.1640.1971.7040.1630.1991.696C0.1640.1971.7040.1640.1991.695AB0.1640.1970.8520.1640.1980.847BC0.1640.1970.8520.1630.1990.848CA0.1640.1970.8520.1630.1990.846ABC0.1640.1970.9840.1640.1990.978Max Error: (0.852-0.846)/0.852 = 1.0%ZSCurrSubtr：W1,W2,W3的减零流功能投退差动动作时间测试 (故障电流Id=2* IdMin的条件下测试) 故障相HV动作时间MV动作时间LV动作时间A37.537.6B38.536.6C39.940.71.4差动速断动作值测试（Unrestraint Differential Current）故障相HV动作值MV侧动作值LV侧动作值10IB5.47A10IB(6.56A)10IB(7.88*4.17A)=32.8AA5.48A6.56ANAB5.48A6.56ANAC5.48A6.56ANA 差动速断动作时间测试：Id=1.2IH故障相HV (6.8A) MV(7.9A)LV侧动作时间A33.3ms34.3msNAB28.5ms34.9msNAC27.9ms30.6msNA1.5 比例制动特性（Restraint characteristic）(以高压中压侧特性为例)相关计算：两侧二次电流的折算比例为k=0.547/0.656=0.833差动电流计算：Idiff = Ihv-Imv *k制动电流计算：Ibias = Ihv （测试中减小中压侧电流至保护动作）制动系数SId/Ib(%)Idiff/Ibias测试条件： W1,W2,W3的减零流功能均退出,负序功能退出。在高压，中压侧均加单相电流，每点电流按折算比例加入，如HV侧0.547A低压侧0.656A电流反向，使差动保护无差流，减低中压侧二次电流，读取保护动作时中压侧电流值。记录保护动作时的高压侧电流和中压侧电流。表中第一点为Section1的区域，第二点为拐点IBias1.25IB,第三点为Section2的一点，第四点为拐点2，IBias3IB，第五六点为Section3的测试的它的斜率为80。具体加流Imv.A = Ia(0), Ihv.A = Ib(180)。试验装置Ia相电流作为中压侧A相电流；试验装置Ib相电流作为高压测A相电流。降低试验装置a相电流到保护动作。A相差动测试结束再分别测试B，C相的比例制动特性。测试记录和计算表格：A高压侧电流(A)0.500.6841.21.64122.5中压侧电流(A)平衡0.600.8211.441.9672.43.00中压侧电流(A)0.4040.6240.9961.3121.3891.509差动电流Idiff(A)0.1630.1640.3700.5480.8431.243制动电流IBias(A)0.500.6841.21.64122.5Id/Ib(%)39.9%40.4%82.2%80.0%B高压侧电流(A)0.500.6841.21.64122.5中压侧电流(A)0.4040.6240.9961.3121.3891.509差动电流Idiff(A)0.1630.1640.3700.5480.8431.243制动电流IBias(A)0.500.6841.21.64122.5Id/Ib(%)39.9%40.4%82.2%80.0%C高压侧电流(A)0.500.6841.21.64122.5中压侧电流(A)0.4040.6240.9961.3121.3891.509差动电流Idiff(A)0.1630.1640.3700.5480.8431.243制动电流IBias(A)0.500.6841.21.64122.5Id/Ib(%)39.9%40.4%82.2%80.0%第2，4点为040和4080之拐点，这两点位于1.25IB和3.0IB处，拐点位置决定于保护定值。1.6 比例制动特性（Restraint characteristic）(高压低压侧特性)相关计算：高低两侧电流的折算比例为k=0.164/1.704=0.0962（按等容量折算）差动电流计算：Idiff=Ihv-Ilv *k制动电流计算：Ibias=Ihv制动系数SId/Ib(%)Idiff/Ibias将差动电流折算到高压侧的二次差动电流（等值三相断路情况下的差流）Ibias=Ihv（按高压侧的二次电流计算）在低压侧（三角形侧）加单相电流，高压侧（Y侧）加两相电流，在平衡状态，降低低压侧电流，直到保护动作，读取保护动作值：A相特性测试时保护的加量情况: Ihv.A= Ia 0度 Ihv.B=Ib 180度 (Ib= -Ia) Ilv.A = Ic 180度 （Ia,Ib,Ic为试验装置电流） A相测试结束,再分别测试B, C相的比例制动特性, 方法类似。测试记录和计算表格：A高压侧电流(A)0.500.6841.21.6411.701.80低压侧电流(A)平衡5.1977.1112.4717.0518.7117.67低压侧电流(A)3.5025.428.6011.2811.4511.65差动电流Idiff(A)0.1630.1630.3730.5550.5990.679制动电流IBias(A)0.500.6841.21.6411.71.8Id/Ib(%)40.7%41.3%74.6%80.3%B高压侧电流(A)0.500.6841.21.6411.701.80低压侧电流(A)3.5025.428.6011.2811.4511.65差动电流Idiff(A)0.1630.1630.3730.5550.5990.679制动电流IBias(A)0.500.6841.21.6411.71.8Id/Ib(%)40.7%41.3%74.6%80.3%C高压侧电流(A)0.500.6841.21.6411.701.80低压侧电流(A)3.5025.428.6011.2811.4511.65差动电流Idiff(A)0.1630.1630.3730.5550.5990.679制动电流IBias(A)0.500.6841.21.6411.71.8Id/Ib(%)40.7%41.3%74.6%80.3%在W1,W2,W3的减零流功能投入的情况下，测试高中比例制动特性时，差动电流值计算需乘以23的系数。测试高低比例制动特性与减零流功能投退无关。1.7 差动谐波制动测试（1）二次谐波制动特性试验装置a相电流输出基波电流到高压测A相；试验装置b相电流输出二次谐波电流也加到高压测A相，A相基波电流需大于最小动作电流,谐波电流初值需大于Ia*15%,降低谐波电流直到保护动作，记录测试数据。然后再用同样方法测试B,C相的特性。制动系数 S=I2/I1(%)AI1(A)0.300.501.002.003.00I2(A)0.0450.0760.1520.3030.455I2/I1(%)15.0%15.2%15.2%15.2%15.2%BI1(A)0.300.501.002.003.00I2(A)0.0450.0760.1520.3030.455I2/I1(%)15.0%15.2%15.2%15.2%15.2%CI1(A)0.300.501.002.003.00I2(A)0.0450.0760.1520.3030.455I2/I1(%)15.0%15.2%15.2%15.2%15.2%（2）五次谐波制动特性试验装置a相电流输出基波电流到高压测A相；试验装置b相电流输出五次谐波电流也到高压测A相，测试方法同二次谐波制动特性。然后再同样方法测试B,C相的特性。制动系数S=I5/I1(%)AI1(A)0.300.501.002.003.00I5(A)0.0830.1390.2780.5570.836I5/I1(%)27.6%27.8%27.8%27.8%27.8%BI1(A)0.300.501.002.003.00I5(A)0.0830.1390.2780.5570.836I5/I1(%)27.6%27.8%27.8%27.8%27.8%CI1(A)0.300.501.002.003.00I5(A)0.0830.1390.2780.5570.836I5/I1(%)27.6%27.8%27.8%27.8%27.8%中压侧谐波制动测试方法与高压侧相同，建议选择高中低的任一侧测试即可。五次谐波的最大误差为2.8%1.8 负序差动特性的测试将负序差动功能投用，IMinNegSeq0.05IB, NegSeqROA= 60度.计算： 高压侧负序最小动作电流的计算: (二次) IMinNegSeq= 0.05*0.574= 0.02735A对应加单相电流为IPN.HV= 0.082A中压侧负序最小动作电流的计算: (二次) IMinNegSeq= 0.05*0.656= 0.0328A对应加单相电流为IPN.MV= 0.098A 测试方法:1) 中压侧加单相电流为0.2A,高压侧加电流为0.05