Investigation Of The Load Impact On The Output Capability And The Synchronization Of Impulse Voltage Generators

The high voltage equipments of the electrical power system should be tested under the impulse voltage before they are operated to test the insulated capability under the overvoltage. As the development of power technology, there are more kinds of equipments which should be tested under the impulse voltage. The entrance capacitances of GIS and HV cables can reach above 3000pF to 10000pF. And the inductance of the transformer and Air-Choke is always be accounted in mH. We should make use of the typical lightning impulse voltage wave shape or operation wave shape when the equipments are tested. There are different impedance capabilities of the equipments, so we have to calculate and adjust the parameter every time, and it is sure to affect the synchronization capability. Sometimes we cannot even satisfy the output waveform requirements only by adjust the parameters of the component, which is a new challenge for us to design or do the test. And it is a new request for the output and synchronization capability. In order to make good use of the impulse voltage generator which we already have, we should take some measures to improve the equipment to generate the wave shape which measures up to the standard.In this article, we discussed the output capability of the typical impulse voltage generator with a large capacitance load or a small inductance load, and the synchronization capability. And we also gave some suggestions of solving the problems of overshoot, short time to half value, oscillation of the wave, high extreme value of undershoot, and the bad synchronization capability. The ATP simulation method was employed to analyze the generator in different situations to compare the wave shapes of the output before and after we took the measures. So we can verify the validity of the measures such as improving the circuit. The investigation shows that we can take some measures to improve the load capability and synchronization of the typical impulse voltage generators which we already have. The investigation result could give some advice of improving the circuit and designing the parameters of the components for the factories of impulse voltage generators and the high voltage lab.