Metering & protection

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Station DC feeder selectivity boundarySDFSB · Schematic Station DC insulation-monitor interfaceSDII · Schematic Station double-point indication interfaceSDII · Schematic Station GNSS time-source interfaceSGTI · Schematic Station IED configuration-revision referenceSICR · Schematic Station local-control ownership interfaceSLOI · Schematic Station RTU command-authority gateSRCG · Schematic Station telemetry stale-data flagSTSF · Schematic Station time-source selection blockSTSB · Schematic Station UTC-local display boundarySUDB · Schematic Station-bus supervisory interfaceSSI · Schematic Stator ground-fault protection64G · SLD / Schematic Stopping device5 · SLD / Schematic Summated phase-current relay inputSPRI · Schematic Summation current transformerΣCT · Schematic / SLD Summation energy meterΣ kWh · SLD / Schematic Surge arrester counterSC · SLD / Schematic Synchronising lampsSL · Schematic Synchronism check25 · SLD / Schematic SynchronoscopeSYNC SCOPE · SLD / Schematic Synchronous-speed device13 · SLD / Schematic TachometerRPM · SLD / Schematic Tachometric dynamoHIN1B11 · Schematic Tap-change incomplete-operation alarmTIA · Schematic Tap-changer lower-command interfaceTLI · Schematic Tap-changer lower-limit inhibitTLI · Schematic Tap-changer motor-protection interfaceTMI · Schematic Tap-changer movement-in-progress inputTMI · Schematic Tap-changer operation-complete feedbackTOF · Schematic Tap-changer raise-command interfaceTRI · Schematic Tap-changer upper-limit inhibitTUI · Schematic Tap-position analogue-input interfaceTAI · Schematic Tap-position coded-input decoderTCD · Schematic Tapped-secondary current transformerCT TAP · SLD / Schematic Telemetering device77 · SLD / Schematic Temperature control device23 · SLD / Schematic Temperature indicatorTEMP · SLD / Schematic Temperature measuring transducerTEMP TX · SLD / Schematic Test plugTP · Schematic Thermal protection49 · SLD / Schematic Thermistor motor protection relayPTC · Schematic ThermocoupleTC · Schematic Thermocouple with terminal boardHTC1LTB · Schematic Three-point current measurement selectorHSW1S94 · Schematic Three-pole trip conversion blockTTCB · Schematic Three-wire ultrasonic sensorHPX11U3 · Schematic Time ground-overcurrent protection51G · SLD / Schematic Time negative-sequence overcurrent51Q · SLD / Schematic Time neutral-overcurrent protection51N · SLD / Schematic Time overcurrent51 · SLD / Schematic Time phase-overcurrent protection51P · SLD / Schematic Time-alignment validation boundaryTVB · Schematic Time-client quality rejection interfaceTQRI · Schematic Time-delay starting or closing relay2 · SLD / Schematic Time-delay stopping or opening relay62 · SLD / Schematic Time-distribution redundant-path interfaceTRI · Schematic Transformer bushing-monitor alarm interfaceTBAI · Schematic Transformer circulating-reactive-current restraintTCR · Schematic Transformer cooler common-failure alarmTCCA · Schematic Transformer cooler duty-standby rotationTCDR · Schematic Transformer cooler supply-loss inputTCSI · Schematic Transformer cooling stage-one requestTCSR · Schematic Transformer cooling stage-two requestTCSR · Schematic Transformer differential protection87T · SLD / Schematic Transformer differential restraint interfaceTDRI · Schematic Transformer fan run-proof supervisionTFRS · Schematic Transformer gas-accumulation alarm inputTGAI · Schematic Transformer inrush-restraint interfaceTII · Schematic Transformer main-tank oil-level alarmTMOA · Schematic Transformer moisture-monitor interfaceTMI · Schematic Transformer neutral-current measurement interfaceTNMI · Schematic Transformer oil-pump flow-proof supervisionTOFS · Schematic Transformer oil-surge trip interfaceTOTI · Schematic Transformer online gas-monitor interfaceTOGI · Schematic Transformer overexcitation measurement interfaceTOMI · Schematic Transformer pressure-relief operated indicationTPOI · Schematic Transformer protection lockout distributionTPLD · Schematic Transformer restricted-earth-fault zone interfaceTRZI · Schematic Transformer sudden-pressure trip interfaceTSTI · Schematic Transformer tap-changer oil-level alarmTTOA · Schematic Transformer through-fault accumulation monitorTTAM · Schematic Transformer top-oil temperature alarm interfaceTTTAI · Schematic Transformer winding thermal trip interfaceTWTTI · Schematic Transient or intermittent earth-fault protection67NIEF · SLD / Schematic Trip-circuit supervision relayTCS · Schematic Trip-coil monitoring74TCM · SLD / Schematic Tripping or trip-free relay94 · SLD / Schematic Turning-gear engaging device54 · SLD / Schematic Two-network voltage measurement selectorHSW1S93 · Schematic Ultrasonic distance sensorUS DIST · Schematic Ultrasonic NC switching outputHPX12U · Schematic Ultrasonic NO switching outputHPX11U · Schematic Ultrasonic proximity switchHPX1U · Schematic Undercurrent or underpower protection37 · SLD / Schematic Underfrequency protection81U · SLD / Schematic Underpower protection32U · SLD / Schematic Underspeed device14 · SLD / Schematic Undervoltage27 · SLD / Schematic Unit sequence starting relay44 · SLD / Schematic Unit sequence switch10 · SLD / Schematic