A range of locally manufactured electronic motor protection relays is ideally suited for fitting into gate-end boxes for protecting underground coal cutting machinery and transformers. NewElec’s 100M Series protect against phase unbalance and loss, even on lightly loaded motors. The relays accommodate the thermal withstand capabilities of the protected motor and provide thermal protection for supply cables, as well as overall short circuit protection.
In the event of a trip, the respective LED and the main trip LED are latched in order to assist maintenance personnel in identifying the cause for the trip. Warning LEDs indicate when the respective threshold settings are exceeded.
The 100M Series is available in calibrations from 5 to 360 A, split over three ranges, or in percentage calibration. Selectable motor starting curves from 2 to 10 s, as well as a thermal envelope that exactly accommodates the duty design parameters of the motor are available. This is achieved by selecting thermal lock-out periods ranging from 30 s (120 stop – starts per hour) to 10 minutes (6 stop – starts per hour).
The main trip relay comprises 1 n/o and 1 n/c contact. The short circuit protection trip contact is a dedicated n/o, designed to operate a shunt trip on a back-up circuit breaker. During operation the relays ensure that the main contactor is not used to clear potentially damaging high-energy faults. With a small 52 x 113 mm footprint, the relays plug into a chassis-mounted 11-pin base for ease of maintenance.
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