Q)What is Effect of Cable Capacitance on the Operation of AC operated Contactors
When long length of cables is used the stored energy in the capacitance of the cable holds the contactor even after the closing command is removed. Typical value of capacitance for two core cable is 0.3 micro farad/km
Fig:Stray capacitance
Remedy:
1) Use of DC control supply voltage
2) Use of lower supply voltage
3) Short circuiting of contactor coil during off command by additional bridge contacts.
4) Use of large contactors
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