Power Quality Monitoring

Summation current transformers (CTs)ApplicationsSummation current transformers have the task of adding up the secondary currents from various main, CTs and,therefore, making the measurement of an instrument accessible. Summation current transformers redeliver a norm signal at theoutput. This means that not only an addition of the input currents takes place but also the sum is divided through the amountof summands (number of inputs). We differentiate between summation current transformers for even and uneven maintransformers.All dimensions stated in these drawings are in mm.General mechanical properties Sturdy plastic housing made of ABS, IP40 Flame resistant in accordance with UL94VO and self extinguishing Nickel clamps with positive-negative screws Integrated contact protection, IP10 Nominal frequency 50 Hz to 60 Hz Insulation class E (other classifications upon request) Thermal short-term current Ith= 60 x IN /1sSurge current Idyn=2.5 x INMaximum operating voltage Um = 0.72kV(other voltages upon request)Calculation of insulation level (test voltage)3kV/1min (other voltages upon request)Overvoltage limit factor FS5 or FS10Overview of current transformers class 1DescriptionTypePrimarycurrent in ASecondarycurrent in APower in VAClassItem numberSCT 5+5 -1 IPS20 5+5 5 15 1 15.02.510SCT 5+5+5 -1 IPS30 5+5+5 5 15 1 15.02.515SCT 5+5+5+5 -1 IPS40 5+5+5+5 5 15 1 15.02.520Overview of current transformers class 0.5DescriptionTypePrimarycurrent in ASecondarycurrent in APower in VAClassItem numberSCT 5+5 -0.5 IPS20 5+5 5 15 0.5 15.02.511SCT 5+5+5 -0.5 IPS30 5+5+5 5 15 0.5 15.02.516SCT 5+5+5+5 -0.5 IPS40 5+5+5+5 5 15 0.5 15.02.519Note: the conversion ratio of the main CTs must be provided when placing an order.The ratio of the largest to smallest primary current should not be greater than 10:1 for uneven main transformers.168