Overview

The E5-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. It is member of the DTRV product type in the EuroProt+ product family.

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 E5-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. It is member of the DTRV product type in the EuroProt+ product family.

The E5-TR relay provides a variety of versatile protection functions along with the main transformer differential protection, such as 3ph, Io and I2 overcurrent protection, overload protection, restricted earth-fault protection etc.

Sensitive restricted earth-fault protection (REF) is the final element in the overall differential protection system, which detects even single phase-to-ground faults close to the grounded neutral of the transformer.

The multiple instances of the implemented three-phase and residual overcurrent functions are provided for the segregated protection of both transformer windings.

Furthermore, several voltage-based protection functions are available for one transformer winding based on the three-phase voltage measurement. The connections of the voltage measurement depends on the current application.

The E5-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. 
Automatic phase shift and turns ratio compensation for all types of transformer winding connections.

It can be used as a back-up protection relay for downstream equipment (e.g. feeders, cables).

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 versatile protections functions can provide back-up protection relay 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,
• Residual current elimination feature is available  if there is a neutral grounding transformer in the protected zone on  the  secondary  side  of  the  transformer,
• Sensitive restricted earth-fault protection,
• Several voltage-based protection functions are available through the three-phase voltage measurement,
• Current unbalance detection of Current Transformers,
• 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 E5-TR configuration measures three phase currents, the residual current component from both sides of a three-winding, three-phase transformer and, additionally, three phase voltages. These measurements allow, in addition to the current- and voltage-based functions, directionality extension of the residual overcurrent function.

The main protection functions are the transformer differential protection and the restricted earth-fault protection functions. Based on the voltage measurement, the frequency is also evaluated to facilitate frequency-based protection functions.

The additional protection functions can provide back-up protection relay for downstream equipment (e.g. feeders, cables etc.).

Documentation

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