Current/Voltage Protection Relay – S24 Series


The IED EP+ S24 Series is member of the EuroProt+ numerical protection relay, made by Protecta Co. Ltd. The EuroProt+ type complex protection in respect of hardware and software is modular device. The modules are assembled and configured according to the requirements, and then the software determines the functions. The IED EP+ S24 Series is  contained a special selection of the EuroProt+ modules, bearing in mind the cost effective realization. The IED EP+ S24 Series is divided into several different variants corresponding to the scope of application.

Depending on the standard configuration chosen (Variant 1, Variant2,…), the IED is adapted to the protection of medium-voltage feeders in isolated neutral, resistance earthed, compensated and solidly earthed networks. Once the application-specific settings have been defined for the standard configuration IED, it can be put into service directly. Areas of application include protection functions for a large variety of applications, e.g. transformer differential and restricted earth fault protection, frequency and voltage based protection, motor protection, thermal overload protection.

Product details


♦ Native IEC 61850 IED with Edition 1 & 2 compatibility.
♦ 24HP wide rack size with several mounting methods: Flush mounting; Semi-flush mounting; Din rail mounting; Flush/Din rail mounting with IP54 rated cover.
♦ The pre-defined factory configuration can be customized to the user’s specification with the powerful EuroCAP tool
♦ Flexible protection and control functionality to meet special customer requirements.
♦ Different HMI Types: advanced HMI with color touchscreen and black-and-white display with 4 tactile push buttons. An embedded web server and extended measuring, control and monitoring functions are also available for both types.
♦ User configurable LCD user screens, which can display SLDs (Single Line Diagrams) with switchgear position indication and control as well as measuring values and several types of controllable objects.
♦ Various protection setting groups available, 8 setting groups available.
♦ Enhanced breaker monitoring and control.
♦ High capacity disturbance recorder (DRE) and event logging (data is stored in non-volatile memory):
      ° DRE for up to 32 analogue and 64 digital signal channels with duration up to 10s and sampling rate up to 2kHz.
      ° Event recorder can store more than 10,000 events.
♦ Wide range of communication protocols:
      ° Ethernet communication: IEC 61850; IEC 60870-5-104; DNP3.0 TCP; Modbus TCP
      ° Serial communication: DNP3.0; IEC 60870-5-101/103; MODBUS, SPA.
♦ Legacy network based protocols via 100Base-FX and 10/100Base-TX (RJ45). Optional communication ports: Fiber optical Ethernet (MM/ST, SM/FC), RJ45, Serial POF, Serial glass fiber, RS-485/422.
♦ Handle several communication protocols simultaneously.
♦ Built-in self-monitoring to detect internal hardware or software errors.
♦ Different time sources available: NTP/SNTP server; Minute pulse; Legacy protocol master; IRIG-B.


The IED-EP+ S24 Series is available in four predefined standard configurations to suit the most common feeder management application.

  • Variant 0 serves as a simple bay control unit.
  • Variant 1 is configed for non-directional overcurrent protection relay.
  • Variant 2 is configed for directional overcurrent protection relay.
  • Variant 3 is used main protection for overhead lines and cable feeders in distribution networks with distance protection function.
  • Variant 4 application has already included line differential protection function for medium voltage distribution network.
  • Variant 5 is dedicated transformer protection and control IED (intelligent electronic device) for power transformers, unit and step-up transformers including power generator transformer blocks in utility and industry power distribution systems.
  • Variant 6 is dedicated for those application where is only voltage and frequency based protection functions are required.

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