Relay monitors insulation integrity
Second Quarter 2008
Electrical switching & drive systems & components
Starting an electrical drive on a machine that has been standing for a long period of time should be avoided until the insulation level of the motor has been found acceptable. Insulation degradation can occur as a result of moisture ingress in motors which stand for long periods - a situation typically found on plants that work seasonally or in applications where there is a high degree of water contamination.
The EC/ED relay from NewElec monitors the insulation integrity of the motor windings and feeder cable cores to earth while the motor is standing. The main contactor can thus be prevented from closing into a circuit in which the insulation level to earth has deteriorated to an unacceptable level.
The selected 'lock out' relay model determines the acceptable insulation level, while the fused measuring circuit protects the relay against inadvertent damage due to incorrect connections. Compact in design, the EC/ED is suitable for installation in flameproof enclosures. The lock-out relay may be used in conjunction with DOL and star-delta motor starters and for cable protection.
For more information contact Luc Dutrieux, NewElec, +27 (0)12 327 1729, [email protected], www.newelec.co.za
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