Product comparison and selection guide

Compare the models within each protection panel side by side. Ratings, dimensions and communication are laid out in one table, and the guide below tells you when to choose which model.

  1. Decide what you protectTransmission line, transformer, bus, breaker or fault recording — this sets the category.
  2. Check voltage level and system conditions154 kV or 345 kV, short underground line, 1.5-CB scheme — these split the models.
  3. Match communication and I/OConfirm IEC 61850 station bus, IRIG-B time sync and the number of digital I/O points in the specification table.

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      Transmission Line Protection Panel

      ModelSLP-K120Transmission line protection IEDSLP-K140Short-distance T/L protection IEDSLP-K310Transmission line protection IED
      Choose it whenStandard 154 kV lines: current differential (87L) main protection with 3-zone distance back-up.Short 154 kV lines such as urban underground sections, where distance protection is less reliable and 87L is also used as back-up.345 kV lines needing single-pole tripping and reclosing, direct transfer trip (DTT) and out-of-step detection.
      Frequency60Hz60Hz60Hz
      VoltagePhase voltage : 110/√3V, Interlinear voltage : 110VPhase voltage : 110/√3V, Interlinear voltage : 110VPhase voltage
      PowerDC 125V (90~140V)DC 125V (90~140V)DC 125V (90~140V)
      Size445 x 255 x 247mm (W x H x D)487 x 266 x 270mm (W x H x D)445 x 255 x 247mm (W x H x D)
      Weight10kg less than10kg less than10kg
      Main functions
      • Current differential protection function
      • Distance protection function with quadrilateral operating characteristic
      • Overcurrent/undervoltage-based fault detection function
      • High-speed one-shot auto-reclosing function
      • Measurement/monitoring/control function
      • Customized DI/DO/LED/function keys
      • Current differential protection function
      • Distance protection function with quadrilateral operating characteristic
      • Overcurrent/undervoltage-based fault detection function
      • High-speed one-shot auto-reclosing function
      • Measurement/monitoring/control function
      • Customized DI/DO/LED/function keys
      • Current differential protection IED
      • Distance protection IED
      • Connect with PCM optic communication
      • Records fault events and waveforms
      • 7-inch touch LCD
      • Configurable simplified substation single-line diagram
      DetailsDetailsCatalogueDetails

      Transformer Protection Panel

      ModelSTP-K130Transformer protection IEDSTP-K110-96TCTransformer protection IEDSTP-K120Transformer protection IED
      Choose it whenStandard 154 kV transformer protection: ratio differential and overcurrent in one device.Transformer protection with 96TC (mechanical protection) interfacing.Transformer protection with four voltage inputs (overvoltage and zero-sequence overvoltage).
      Frequency60Hz60Hz60Hz
      Voltage110/√3 V–115/√3 V
      PowerDC 125V (90~140V)DC 125V (90~140V)DC 125V (90~140V)
      Size318 x 261 x 270mm (W x H x D)280 x 255 x 247mm (W x H x D)280 x 255 x 247mm (W x H x D)
      Weight––8.0kg
      Main functions
      • Transformer current differential protection function
      • Overcurrent/overvoltage protection function
      • Prevents misoperation from magnetizing inrush current
      • Records fault events and waveforms
      • 7-inch touch LCD
      • Configurable simplified substation single-line diagram
      • Transformer current differential protection function
      • 96TC protection function
      • Prevents misoperation from magnetizing inrush current
      • Records fault events and waveforms
      • 7-inch touch LCD
      • Configurable simplified substation single-line diagram
      • Transformer current differential protection function
      • Overcurrent/overvoltage protection function
      • Prevents misoperation from magnetizing inrush current
      • Records fault events and waveforms
      • 7-inch touch LCD
      • Configurable simplified substation single-line diagram
      CatalogueDetailsDetailsCatalogueDetails

      Bus Protection Panel

      ModelSTP-K120Bus protection IEDSBP-K110-CUBus protection IEDSBP-K110-BUBus protection IED
      Choose it whenCentralised 154 kV bus current differential.Central unit (CU) of distributed bus protection; 1 Gbps optical link to BUs.Bay unit (BU) of distributed bus protection; current and status of two feeders.
      Frequency60Hz60Hz60Hz
      Voltage115/√3 V––
      PowerDC 125V (90~140V)DC 125V (90~140V)DC 125V (90~140V)
      Size280 x 255 x 247mm (W x H x D)487 x 266 x 245mm (W x H x D)230 x 240 x 195mm (W x H x D)
      Weight8.0kg––
      Main functions
      • Current differential protection using the vector sum of the currents of all circuits connected to the main busbar
      • High-impedance differential protection using a non-linear resistor
      • Undervoltage-based fault detection elements
      • CT Failure
      • PT Failure
      • Relay blocking and alarm based on continuous self-monitoring
      • Phase-segregated current differential protection (87B)
      • Undervoltage based fault detection (UV/UVS/UVD)
      • Overcurrent protection (50BF) for circuit breaker failures
      • CT and PT failure detection and alarming
      • External fault detection to prevent wrong tripping due to CT saturation
      • Busbar-bridged protection according to DS status conditions
      • Current measurement and status monitoring of CB, DS and BFI for two feeders
      • Communication with CU based on high-speed serial communication
      • Self-monitoring on a regular basis
      CatalogueDetailsCatalogueDetailsCatalogueDetails

      Breaker Failure Protection Panel

      ModelSTP-K120Breaker Failure Protection IEDSTP-K1201.5CB Breaker Failure Protection IED
      Choose it when345 kV breaker failure protection for conventional bus layouts.Breaker failure protection for 1.5-CB bus layouts.
      Frequency60Hz60Hz
      VoltageDC 125V (90~140V)–
      Power–DC 125V (90~140V)
      Size280 x 255 x 247mm (W x H x D)280 x 255 x 247mm (W x H x D)
      Main functions
      • 2-staged overcurrent detection for each phase
      • Receives phase-segregated or three-phase trip signals from external protection IEDs
      • Operating timer setting
      • Self-monitoring on a regular basis
      • 2-staged overcurrent detection for each phase
      • Receives phase-segregated or three-phase trip signals from external protection IEDs
      • Operating timer setting
      • Self-monitoring on a regular basis
      CatalogueDetailsCatalogueDetails

      Protection IED

      ModelSUR-K22023 kV overcurrent protection IEDSOC-K110Overcurrent protection IEDSUF-K110Low frequency protection IEDSTC-K120Transformer control IEDSSP-K110Overcurrent protection IED
      Choose it whenGeneral-purpose 23 kV overcurrent protection IED (successor to SUR-K210) with measurement, control and interlocking for most distribution bays (main, D/L, B/T).Economical IED focused on overcurrent and earth-fault protection.Dedicated 8-stage underfrequency (81U) protection.Main transformer control and monitoring (OLTC, cooling).Overcurrent protection IED for station service and security facilities.
      Frequency–60Hz60Hz60Hz60Hz
      Voltage–Phase voltagePhase voltagePhase voltagePhase voltage
      Power–DC 125V(90~140V)DC 125V(90~140V)DC 125V(90~140V)DC 125V(90~140V)
      SizeOverall 286 x 244 x 232mm, cut-out 254 x 240 x 203mm (W x H x D)445 x 255 x 247mm (W x H x D)445 x 255 x 247mm (W x H x D)445 x 255 x 247mm (W x H x D)445 x 255 x 247mm (W x H x D)
      Weight7kg9.5kg9.5kg less than9.5kg11kg
      Main functions
      • Overcurrent (50/51) and ground overcurrent (50N/51N, 51G) protection
      • Directional overcurrent (67) and directional ground overcurrent (67N) protection
      • Auto-reclosing (79) and synchronism check (25)
      • Phase overvoltage (59), zero-sequence overvoltage (59GT/59GA) and phase undervoltage (27) protection (BUS 1/2)
      • Load unbalance (46) monitoring, 4 setting groups
      • Measurement of voltage, current, power, power factor, frequency and sequence components (voltage ±0.5%, current ±0.5%, AI ±1.0%)
      • Instantaneous overcurrent (50) detection for phase and ground faults
      • Time overcurrent (51) detection for phase and ground faults
      • Various standard and user-defined time-current (TC) curves
      • Unbalanced load (46) detection through zero-sequence current (I0)
      • CT and PT failure detection
      • 8-step definite-time underfrequency (81U) protection
      • Automatic busbar selection for frequency measurement
      • Fast frequency measurement in every ½ cycle
      • High-precision frequency measurement within the error range of ±5mHz
      • Instantaneous and definite-time phase undervoltage (27) protection for each bus
      • Main transformer control function
      • Per-bank field monitoring and control of the main transformer
      • Monitoring, measurement, control and interlock functions
      • Continuous automatic self-monitoring
      • IEC 61850 Station Bus Interface
      • Serial/Ethernet communication for local/remote access
      • Instantaneous (50) and time (51) operation for short-circuit and earth faults
      • Discriminates short-circuit and earth faults
      • HMI interface and IEC 61850 communication
      • ANSI/IEEE reset curves and user-defined inverse-time curves
      DetailsDetailsCatalogueDetailsDetailsCatalogueDetails

      Distribution Automation

      ModelFRTU(Pole-Mounted)FRTU(Pad-Mounted)
      Choose it whenRemote monitoring and control of gas switches on overhead distribution lines.Underground (22.9/13.2 kV) distribution lines, switches with 1 to 4 circuits.
      Main functions
      • Used on overhead distribution lines
      • Installation: gas-insulated switch (SF6)
      • Obtaining distribution line data (current/voltage, power factor, active/reactive/apparent power)
      • Detection of a distribution line fault (instantaneous/permanent fault)
      • Embedded Fault Indicator
      • Monitoring status of the switchgear and control box
      • Used when establishing underground line (22.9/13.2kV)
      • 1 to 4 times
      • Installation: gas-insulated switch (SF6)
      • Obtaining distribution line data (current/voltage, power factor, active/reactive/apparent power)
      • Detection of a distribution line fault (instantaneous/permanent fault)
      • Embedded Fault Indicator
      DetailsDetails

      Switchgear

      ModelExtra High Voltage SwitchgearHigh/Low Voltage SwitchgearMotor Control Center(MCC)Power/Distribution BoardDistribution Switchboard
      Choose it when
      Main functions
      • Quality assurance system for each process in accordance with ISO 9001
      • Compliance with various domestic and international standards
      • Standardization of the design and manufacturing process
      • Manufacturing of the products that meet the customer’s needs and field conditions
      • Quality assurance system for each process in accordance with ISO 9001
      • Compliance with various domestic and international standards
      • Standardization of the design and manufacturing process
      • Manufacturing of the products that meet the customer’s needs and field conditions
      • Quality assurance system for each process in accordance with ISO 9001
      • Compliance with various domestic and international standards
      • Standardization of the design and manufacturing process
      • Manufacturing of the products that meet the customer’s needs and field conditions
      • Quality assurance system for each process in accordance with ISO 9001
      • Compliance with various domestic and international standards
      • Standardization of the design and manufacturing process
      • Manufacturing of the products that meet the customer’s needs and field conditions
      • Quality assurance system for each process in accordance with ISO 9001
      • Compliance with various domestic and international standards
      • Standardization of the design and manufacturing process
      • Manufacturing of the products that meet the customer’s needs and field conditions
      DetailsDetailsDetailsDetailsDetails