Directing against the problem of electromagnetic interference caused by the frequency converter of pulverized coal feeder to boilers of unit no.1 in Guangzhou Power Plant Co Ltd

the abnormal phenomenon of large fluctuation in analog output current and voltage signals coming from neighbouring sensitive equipments has been analysed.It is believed that the poor anti-interference capability of said frequency converter was caused by improper installation technology in the field

and retrofit measures

such as strengthening isolation

shielding

and grounding

etc.

have been put forward.After implementation

the operation of said frequency converter is stable

having remarkable electromagnetic interference resistant effectiveness.