Siemens DTU3005-B Dokumentacja Pobierz pdf (Strona 18)

In this illustration, however, loads are unevenly divided. A large

number of lighting and small appliance loads are connected to

phase C . This can cause the voltage on phase C to be lower.

Because a small unbalance in voltage can cause a high current

unbalance, overheating can occur in the C phase winding of the

3-phase motor. In addition, the single-phase motors connected

to phase C are operating on a reduced voltage. These loads will

also experience heat related problems.

Transient Voltage A transient voltage is a temporary, undesirable voltage that

appears on the power supply line. Transient voltages can range

from a few volts to several thousand volts and last from a few

microseconds to a few milliseconds. Transients can be caused

by turning off high inductive loads, switching large power factor

correction capacitors, and lightning strikes.

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Siemens DTU3005-B Dokumentacja Strona 18