Abstract:

In the temperature rise test of high current switchgear,in order to solve the problem that the output current of the test system can not meet the requirements due to the large inductance effect,the impedance characteristics of the temperature rise test system and the high current test circuit are tested and calculated by applying the small current.The overall inductive component data of the circuit is obtained.The appropriate capacitance compensation solution is proposed.The analysis and calculation method of the parameter selection,grading switching and protection setting of the compensation capacitor bank is given.After taking the capacitive compensation measures,the output current of the temperature rise test system meets the test requirements of the tested high current switchgear.The proposed scheme has the advantages of good effectiveness,reliable technology and low cost,and does not need to change the capacity of the pressure regulating and flow raising device of the original system.

Key words: compensation capacitor, power factor, reactive power compensation, high current test system