Overview

The E4-TR is a dedicated three-winding transformer protection and control IED; the relay provides complex protection, control and monitoring functions for three-winding power transformers. This device is a member of the DTRV product type in the EuroProt+ product family. The EuroProt+ family complex protection - in respect of hardware and software - is a modular device. Because of the modular architecture, the modules are assembled and configured according to the user’s requirements; from that point on, the software determines the functions.

The DTRV type is designed particularly for protection and control applications of power transformers and generators including generator-transformer blocks. Additionally, the DTRV product type includes a variety of versatile protection functions to meet the users´ most exacting requirements.

Because of the implemented control, measuring and monitoring function, the IED can also be used as a bay control unit.

The EuroCAP configuration tool, which is available free of charge, offers a user-friendly and flexible application for protection, control and measurement functions to ensure that the IED-EP+ devices are fully customisable.

General features

• Native IEC 61850 IED with Edition 2 compatibility
• Scalable hardware to adapt to different applications
• 84 HP or 42HP 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
• Advanced HMI functionality via color touchscreen and embedded WEB server, extended measuring, control and monitoring functions
• 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
• Enhanced breaker monitoring and control
• High capacity disturbance recorder (DRE) and event logging:
• DRE for up to 32 analogue and 64 digital signal channels.
• Event recorder can store more than 10,000 events.
• Several mounting methods: Rack; Flush mounting; Semi-flush mounting; Wall mounting; Wall-mounting with terminals; Flush mounting with IP54 rated cover.
• Wide range of communication protocols:
• Ethernet-based communication: IEC61850; IEC60870-5-104; DNP3.0 TCP; Modbus TCP
• Serial communication: DNP3.0; IEC60870-5-101/103; MODBUS, SPA
• The EuroProt+ family can handle several communication protocols simultaneously.
• Built-in self-monitoring to detect internal hardware or software errors
• Different time sources available: NTP server; Minute pulse; Legacy protocol master; IRIG-B000 or IRIG-B12X

Application

The E4-TR is designed to be the main protection and control IED for three -winding power transformers, including auto-transformers. The relay is a member of the DTRV product type in the EuroProt+ product family.

The E4-TR relay provides a variety of versatile protection functions along with the main transformer differential protection, such as 3ph, Io and I2 overcurrent protection, thermal overload protection, restricted earth fault protection (low- or high-impedance option) etc. It can be used as a back-up protection relay for downstream equipment (e.g. feeders, cables).

The E4-TR transformer protection relay can support double-breaker terminals on any side of the transformer such as breaker and a half or ring bus topology.

The IED includes a wide range of control and supervisory functions, which provide full control and user-defined interlocking schemes for the primary switchgear at the substation.

scope of application

• 3-winding transformer protection and control device with main transformer differential protection and several additional protection functions
• The implemented protection functions provide back-up protection for downstream equipment (e.g. feeders, cables etc.).
• Protection for all kinds of power transformers (including auto-transformers)
• 1-/3-phase tripping and support for double breaker terminals such as breaker and a half  or ring bus topologies
• Three-phase transformer differential protection:
• Automatic phase shift and turns ratio compensation of the transformer.
• 2nd and 5th harmonics restraint for transformer inrush and overexcitation detection
• Restricted earth-fault protection
• Current unbalance detection of CT
• Programmable interlocking schemes
• Optional external units:
• 28 input/ 5 output tap changer transcoder (TRCS)
• Remote I/O unit (RIO)
• Optional transducer I/Os (RTD/mA)
• Optional impedance protection

Protection & control functions

The E4-TR configuration measures three phase currents and the zero sequence current of both sides of a three-winding, three-phase transformer. The main protection functions are transformer differential protection and restricted earth-fault protection functions. The additional protection functions can provide back-up protection for downstream equipment (e.g. feeders, cables).

Documentation

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