13 ms·
How could DC happen through faulty wiring? If the ground impedance of the null/PE is too high?
by atoav 4y ago
How could DC happen through faulty wiring? If the ground impedance of the null/PE is too high?
- londons_explore 4y agoTypically there is some device that uses a lot of power but only from half the AC cycle - for example an 'inverter' air conditioner where one of the four rectification diodes on the input has failled open circuit. Normally this DC current will mostly be absorbed by the utility pole transformer, which has a very low impedance at DC. However, if some of your house/street wiring has a few ohms of impedance, then the current can end up doing through more local devices like fridge compressors. Normally this causes them to overheat pretty quick if the current is large. But a smaller current will eventually cause bearing failure.
- atoav 4y agoMakes sense, thanks for the explaination.