Type 64 Low Resistance Ground Structure |
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The 64 Low Resistance Ground Structure Relay is designed to protect equipment enclosures and alert personnel to "ground" and "hot" (current leakage) fault conditions in DC switchgear and rectifiers while maintaining safe equipment voltages. |
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Type 76 Overcurrent Relay |
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Type 76 Overcurrent Relays provide maximum protection for trolley wires, third rail, & substations from a variety of immediate or remote overload conditions including bolted faults, arcing faults, & heavy overloads. Their solid state design & rugged construction ensure reliable operation such as transit duty substations. |
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Reverse Current Relay |
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The reverse current relay designed by IMPulse NC, INC. protects the rectifiers and DC cathode breakers from reverse currents. |
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(GVMon) Ground Voltage Monitor System (GVMon) |
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GVMon continuously scans a real-time analog input that indicates the ground-to-negative rail voltage of the traction system. GVMon will allow negative excursions (earth ground more negative than the rail) of any magnitude, but will fire a SCR to connect the rail to earth ground if the earth ground becomes positive with respect to the rail by an amount that equals or exceeds the preset (adjustable) threshold voltage. |
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