Klockner Moeller Electric Parts from KlocknerMoeller.net
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All about Motors
Notes on engineering
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Switching of capacitors
DIL contactors for capacitors – individual switching
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Individual compensation
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Group compensation
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When capacitors are switched
on, contactors are heavily stressed by transient current peaks. When a
single capacitor is switched on, currents up to 30 times the rated
current can occur; these can, however, be reliably switched by Moeller
DIL contactors.
When installing capacitors, the VDE specification 0560 part 4 (Germany)
and the standards which apply to each country should be observed.
According to these, capacitors not directly connected to an electrical
device which forms a discharge circuit, should be equipped with a
rigidly connected discharge device. Capacitors connected in parallel to
the motor do not require a discharge device, since discharging is
performed via the motor winding. No switch-disconnectors or fuses must
be installed between the discharge circuit and the capacitor.
A discharge circuit or discharge device must reduce the residual voltage
of the capacitor to less than 50 V within a minute of the capacitor
being switched off. |
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