High voltage direct current (HVDC) characterization platform, up to +/-400kV DC ;
Breakdown voltage, aging behavior, leakage current measurement (conductivity) for gas, solids and interfaces such as bushing… (range from pA to mA) ;
Partial discharge measurement: conventional method and non-conventional methods ;
Possibility to investigate the polarity reversal performance of insulation systems (+/-400kV).
The test platform can be used to characterize the insulator (gas, solid and interface) under DC voltage up to 400kV DC. The partial discharge and the long term performance of insulators or equipment can also be investigate.
Laboratory & Equipment description
+/-200kV DC, 3mA ;
+/-400kV DC, 10mA ;
Leakage current measurement: electrometer with current ranging from 10-13A to 2×10-3A ;
Partial discharge measurement: OMICRON system & alternative methods (UHF, light emission, current…) ;
Resistive divider ;
Temperature monitoring: thermocouples & PT100, PT1000.
The platform is designed to perform HVDC tests under safe conditions. Thanks to the low noise of the HVDC source, partial discharge (PD) in a magnitude of few pico-coulombs (pC) can be detected. The high voltage source is controlled directly via a PC and all the measurement equipment is controlled by a PLC. A dedicated user interface is available.
Capability of measuring very low leakage current for insulators: gas, solid and interface (sensitivity of 10-13A) under +/-200kV DC and +/-400kV DC ;
Low noise level partial discharge measurement under DC voltage: smaller than 5pC ;
Continuous temperature monitoring during tests ;
Possibility to reverse the polarity in order to study the performance of insulators and/or equipment.