SE-125 MANUAL GROUND-FAULT GROUND-CHECK MONITOR
The SE-125 is a combination ground-fault and high-output, ground-check monitor for non-hazardous,resistance-grounded installations. The high-output, ground-check circuit is suitable for slip-ring or commutated-load applications. Two Form C output contacts are provided for contactor control, or for shunt or undervoltage operation ina breaker trip circuit. Two Form C contacts are provided for remote indication.
Ground-fault current is sensed by a CT200 series window-type current transformer with a 5-A secondary. A trip level of 0.5 A, 2.0 A, or 4.0 A is switch selectable for use with a 5-A, 15-A, or 25-A grounding resistor. This corresponds to 0.25%, 1.0%, or 2.0% of the primary rating of the current transformer. Trip time is adjustable from 0.1 to 2.0 seconds.
The SE-125 ground-check circuit recognizes the SE-TA12A’s 12-volt Zener characteristic as a valid end-of-line completion. This is the only passive characteristic that will satisfy the ground-check circuit’s multi-level drive,allow induced currents to circulate in the ground-check loop, survive a phase-to-ground-check fault, and clamp the ground-check voltage during the fault.
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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FEBRUARY 14, 2001 |
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REVISION 3 |
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S95-C125-00000 |
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1008 KB |
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