Why the electronic gadgets should fail when the power fails or resumes?

Question

In our industry i am facing a peculiar problem. Some of the electronic gadgets like drives, power cards, control cards, electronic chokes etc,irrespective of capacity, are failing frequently when ever the power fails or resumes.

Answer 1

This is from something called transients. They are voltage spikes that can be many times that of the nominal voltage. They may last for only very small time periods (µS) but are devastating to electronics.

Transients are very difficult to prevent and can be caused by switching on the transmission system or lightning.

You can fit surge protectors to small devices or use isolation transformers for larger equipment to help protect it. There are are many power quality meters available to buy or rent that will record "out of range" events if you want to challenge your power supplier.

Answer 2

Thank you for your very interesting question!

Unequivocal answer to that question is not ...

Try to see the answers to specific sites

Answer 3

voltage surges fry some components.

Answer 4

Electronic gadgets are not harmed when the power fails, it is when the gadget is still "on" and the power resumes which causes the problem. Whenever power resumes after a failure, the electric surge can be so strong that it overloads the components. This is the reason why you should put all gadgets off when a power interruption occurs and wait a few seconds before putting them back on when the power resumes.