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
  • Module layouts with options 42 or 84 HP wide rack size (height: 3U)
  • 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 setting values, measurement values, event and fault information (timestamp, function block, fault phase, fault current...)
  • 8 setting groups available as default. The number of setting groups can be up to 20 as user’s requirement
  • Enhanced breaker monitoring and control
  • High capacity disturbance recorder (DRE) and event logging in non-volatile memory:
    o DRE can store more than 64 records.
    o Each DRE recording can be configured up to 32 analogue and 64 digital signal channels with duration up to 10s and sampling rate up to 2kHz.
    o Event recorder can store more than 10,000 events.
  • The records can be read out from IED in the standard COMTRADE file format (IEEE Std C37.111) via exist communication connection (such as IEC61850) or even examined online. Every single record stored in 3 files with the same name and the following extensions: .dat, .cfg,.inf
  • Several mounting methods: Rack; Flush mounting; Semiflush mounting; Wall mounting; Wall-mounting with terminals; Flush mounting with IP54 rated cover.
  • Wide range of communication protocols:
    o Ethernet-based communication protocol: IEC61850, DNP3.0 TCP, IEC60870-5-104, Modbus TCP
    o Serial communication protocol: DNP3.0, IEC60870-5- 101, IEC60870-5-103, MODBUS, SPA
  • Legacy network based protocols via 100Base-FX and 10/100Base-TX (RJ45)
  • Optional communication ports: Fiber Ethernet (MM/ST, SM/FC), RJ45, Serial POF, Serial glass fiber, RS-485/422
  • Handling several communication protocols simultaneously
  • Built-in self-monitoring to detect internal hardware or software errors
  • Time synchronization protocol: NTP/SNTP, Minute pulse, Legacy protocol, IRIG-B
  • Integrated advanced cyber security - Conformity with the Cyber Security requirements in accordance with NERCCIP, IEEE 1686, BDEW Whitepaper and IEC 62351-8 standard and recommendation. Passwords are required when logging into the device for: access, control, setting, manage,...


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:

Other products!