QS30b-type high-voltage bridge is newly-designed semi-intelligent high-voltage bridge. It takes use of combined line of current-comparator and Schering bridge. The instrument could measure dielectric loss tgδ and capacitance (C) under AC high voltage for all kinds of insulating oil and insulating materials. It uses straight polarity, testing object insulating to earth. As the bridge includes a 2500kV high voltage power source and a high voltage standard capacitor, also it combines the galvanometer and the high voltage bridge, the bridge is particularly adapted to measure dielectric loss (tgδ) and permittivity (ε) for various types of insulating oil and insulating materials. Also the bridge is equipped with data processing and printing functions, making the measurement more convenient and intuitive.
Technical Parameters
Bridgecapacitance ratio Cx/Cs (when the rated ratio is 1:1) is 0-1.11110, step 0.00001, multiplying power(K)ranges from grade 10,5,2,1. Capacitancemeasuringrange depends oncapacitance of the standard capacitorCs. That is Cx=Cs·K·(Cx/Cs)
Measurement accuracy of capacitanceratio: when capacitanceratio reading on the first scale is full,
tgδ< 3×10-3 , +0.00005
tgδ≥3×10-3 , +0.00005+0.005×tgδx
Bridge tgδ range +0.111110,step 0.000001
Tgδx measurement accuracy≤±0.5% tgδx±5×10-5
Tested capacitance display:Cx=(0.1~11.1110)Cn Capacitanceanddielectric loss display accuracy:Capacitance :±0.5%×tgδx±0.00005;dielectric loss:±0.5% tgδx±5×10-5
Power supplyvoltage220V, tolerance 10%,,frequency 50±2Hz, Power consumption 40W
Technical characteristics ofhigh voltage power supply:output voltage:0~2500V/50Hz;output highcurrent出:0~10mA(approx)
Built-instandardcapacitor: capacitance 100Pf or 50pF(Nominalvalue,actual value is showed in print file)