overvoltage capability of appliances/TV sets
overvoltage capability of appliances/TV sets
(OP)
How long would you expect an an appliance or electronic device like a TV or microwave to last due to a sustained overvoltage? I'm thinking of a steady-state voltage in the 2 to 2.5 times normal range.
Have the surge protective devices folks done any work in this area?
Have the surge protective devices folks done any work in this area?






RE: overvoltage capability of appliances/TV sets
RE: overvoltage capability of appliances/TV sets
Keith Cress
kcress - http://www.flaminsystems.com
RE: overvoltage capability of appliances/TV sets
In high school we used banks of 150 W lights at 173% voltage for lightning effects on stage. The lamps lasted for many minutes.
But I agree with itsmoked in principle.
Bill
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"Why not the best?"
Jimmy Carter
RE: overvoltage capability of appliances/TV sets
I just found a reference to some work done by Hydro Quebec. They refer to common electrical appliances like TVs, VCRs, digital clocks, answering machines and microwave ovens.
Their summary states:
- for 1 cycle events, most of the appliances were not damaged at voltages less than 250 V (208% of 120 V).
- for 10 cycle and 100 cycle events, most equipment was not damaged at voltages less than 200 V (166% of 120 V).
I suspect the cabability that is being described is largely a function of the internal MOVs in the appliance tested.
RE: overvoltage capability of appliances/TV sets
Keith Cress
kcress - http://www.flaminsystems.com
RE: overvoltage capability of appliances/TV sets
http://www.itic.org/archives/iticurv.pdf
Not sure how useful it would be for your general appliances though.
RE: overvoltage capability of appliances/TV sets
My experience is that most appliances do not have an MOV in them, bearing in mind that they are usually subjected to cost-reduction engineering.
Also, an MOV subjected to 2* rated voltage will blow up in spectacular fashion.
At 2* rated voltage the usual switcher power supply will definitely blow up in a cycle or maybe two.
In the olden days, when we used transformers and regulators, the damage would be confined to a blown fuse.
Regards,
Ray.