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| Electrically Operated Valve |
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Apparatus Thermal Device
(RTD: Air, water cooling...) |
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| Bearing Protective Device |
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| Field (over/under excitation) Relay |
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Field Circuit Breaker
(Apply or remove field excitation) |
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Running Circuit Breaker
(Principal function is to connect a machine to its source of operating voltage) |
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Manual Transfer or Selector Switch
(Local/Remote) |
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Reverse-phase or Phase-Balance Current Relay
(Unbalanced current, negative-sequence current) |
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Phase-sequence or Phase-Balance Voltage Relay
(Desired voltage phase sequence, unbalanced voltage, negative-sequence voltage) |
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| Incomplete Sequence Relay |
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Motor or Transformer Thermal Relay
(Stator RTD) |
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| Instantaneous Overcurrent Relay |
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AC Inverse Time Overcurrent Relay
(TCC Curve) |
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| Exciter or DC Generator Relay |
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Voltage or Current Balance Relay
(Difference in input/output voltage or current) |
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Permissive Control Device
(Generally a two-position device that in one position permits
the closing of a circuit breaker, or the placing of an equipment into operation, and in the other
position prevents the circuit breaker or the equipment from being operated.) |
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| Automatic Selective Control or Transfer Relay |
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| Differential Protective Relay |
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Line Switch
(This is what we use in the switchyards) |
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Tripping or Trip-Free Relay
(functions to trip a circuit breaker, contactor, or
equipment; to permit immediate tripping by other devices; or to prevent immediate reclosure
of a circuit interrupter if it should open automatically, even though its closing circuit is maintained closed.) |
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