At present

the construction of smart distribution network is continuously promoted

which speeds up the development of related technologies of primary and secondary equipment of distribution switch

and

however

higher requirement of the secondary equipment under the long term and complicated electromagnetic environment is put forward. In this paper

the test platform of the electromagnetic interference of short circuit current to the secondary equipment of distribution switch is set up on the basis of synthetic test circuit. The study on the influence of the related interference of the breaking fault current on the complete set equipment is developed

the reason of interference signal genration and also the spectrum characteristic are analyzed. As for the interference characteristic

a set of anti-interference measurement system is designed

the ATP-EMTP is used to simulate synthetic circuit for simulation analysis and actual test verification. The results show that in case of breaking test of the complete set equipment the secondary equipment port will be disturbed greatly. The current waveform will also be distorted

the maximum interference current can be up to 26 A and the interference current is affected by the magnetic saturation and desaturation of the current transformer. With addition of the anti-interference measures

the output accuracy of the secondary equipment is increased by about 40% over the previous one. The test resutl this time can provide related evidence for the electromagnetic compability study of the secondary equipment of the primary and secondary fusion complete set complete set equipment.