Design of 20 kV High Voltage Cable Insulation Tester Based on K7G20 Touch Control Machine
Conventional 10 kV insulation resistance testers cannot effectively detect the faults of 110 kV and above cables with high resistance value and high residual voltage.In order to solve this problem,a high-voltage cable insulation tester was designed based on K7 G20 touch control integrated machine,which has three functions,i.e.,main insulation resistance test,protective layer voltage resistance test,and protective layer protector test.From the perspective of characteristics of high resistance and high residual voltage faults of high voltage cables,a 20 kV voltage output module is designed,and the measuring circuit is modified by ratio measurement to improve the measuring accuracy of test voltage and leakage current.The K7 G20 touch integrated machine is used as the total controller and the implementation body of the man-machine interface to realize remote intelligent testing.Through on-site test of a 220 kV cable line in Shanghai,it shows that the instrument can effectively detect cable insulation fault with high resistance value and high residual voltage,and has the test function of protective layer and protective layer protector,which can effectively improve the efficiency of quick fault repair of high voltage cable.
high voltage cableinsulation testhigh residual pressureintelligent test
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