Uninterruptible power supply

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The common troubles of the utility power

The common troubles of the utility power

 

The common troubles of the utility power
Power troubles

Descriptions

Waveform

Possible Reasons

POWER FAILURE

A zero volt. for 2 cycles or more

 

Breaker tripped, main power failure, interruption of utility power distribution

POWER SURGES

>110% normal voltage for one cycle or more

 

Heavy electrical equipment turning off

VOLTAGE SPIKES

up to 6KV within a period of 1/10000 seconds to 1/2 cycles

 

Lightning, power switching, arch discharge, electrostatic discharge, large electrical equipment on-off

TRANSIENTS

up to 20KV within a period of a millionth to 1/10000 seconds

 

 

Lightning, power switching, arch discharge, electrostatic discharge, large electrical equipment on-off

POWER SAGS

Lower than 80%~85% normal voltage for one cycle or more

 

Starting up of Heavy loads or heavy electric machines/electrical motors

LINE NOISE

RFI, EMI and other high frequency interferences.

 

Electrical machines, relay, motor controlling machines, broadcasting emitting, microwave emitting, etc.

FREQUENCY VARIATION

> 3 Hz frequency alternation

The unstable operating of generator, unstable frequency of the utility power system.

BROWNOUT

Lower than a certain percentage of normal voltage

Starting up & application of Heavy equipment, utility power transferring, overloaded

 

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