Transformer Protection Relay – S24 Variant 5


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.

The S24 Variant 5 relay is dedicated transformer protection and control IED for power transformers, unit and step-up transformers including power generator-transformer blocks in utility and industry power distribution systems.

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 Variant 5 configuration measures three phase currents and the zero sequence current component from both sides of a two winding, three-phase transformer. The main protection functions are transformer differential protection and restricted earth-fault protection functions.

The realized current-based protection functions, including thermal replica protection functionand differential functions, are listed in
the Table below:

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