For solving the capacity limitation problem due to damage of voltage regulator and circuit breaker tripping of external power supply which caused by excessive capacitive current of system during the fault test study of true value simulation distribution test network（TVSN）

a method of current compensation at low voltage side is proposed. In this method

the inductive current is produced by way of connecting shunt reactor between the low voltage side of step-up transformer and the output side of voltage regulator

the capacitive current on the faulty phase is compensated as much as possible

the current flowing through the voltage regulator and the external power circuit breaker is reduced

the damage of voltage regulator and the tripping of external power circuit breaker are prevented. The test is verified on the 10 kV TVSN which is founded by a certain company. It is shown by the verification that after the use of current compensation at low voltage side

the permitted fault current is up to 45 A

which is 3 times before compensation and can meet the test requirement. The power capacity limitation is solved effectively by this method in the test.