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Products»EuroProt+»DTRV» E7-TR Automatic voltage regulator
84HP wide84HP wide back42HP

The E7-TR is a dedicated automatic voltage regulator (tap changer controller) IED; the relay provides tap changer control and monitoring functions for two- or 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 control, measuring and monitoring functions implemented, 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


84HP wide84HP wide back42HP

The E7-TR is designed to give control over the tap-changer of power transformers. The relay is a member of the DTRV product type in the EuroProt+ product family.
The E7-TR relay includes a powerful Automatic Tap Changer Control function (manual control included) along with voltage protection functions.

Scope of application

  • Automatic or manual voltage regulation (tap changer control) for transformers
  • Additional voltage protection functions.
  • Tap changer supervision; 6 bit tap changer position definition (Binary, BCD, Gray, mA)
  • Optional external units:
    • 28 input/ 5 output tap changer transcoder (TRCS)
    • Remote I/O unit (RIO)

Protection & Control functions

The E7-TR configuration measures three phase currents, the residual current component and, additionally, three phase voltages and the residual voltage component from both sides of the transformer. The tap-changer controller function also considers the voltage drop of serial network elements and the healthy state of the high voltage supply network. Voltage limitation functions are also included.

Protection & control functions IEC ANSI *Inst.
Definite time undervoltage protection function U<, U<< 27 2
Definite time overvoltage protection function U>, U>> 59 2
Automatic tap changer controller function (parallel transformers included) 90V 1
*The INST. column contains the numbers of the pre-configured function blocks in the factory configuration.These numbers may be different in order to meet the user’s requirements.
Hardware Guides version Format Date Size
Hardware description 2.00 10/02/2023
4.24 MB
Maintenance guide 2.0 18/11/2022 769.82 KB
Application Guides version Format Date Size
Operating Manual and Troubleshooting Guide FW version 2.8 1.4 14/03/2023
3.59 MB
IEC61850 documents version Format Date Size
Protocol Implementation Extra Information - PIXIT 1.1 20/03/2017 259.27 KB
Protocol Implementation Conformance Statement - PICS 1.1 20/03/2017 261.09 KB
Model Implementation Conformance Statement - MICS 1.0 21/05/2012 864.71 KB
Configuration Descriptions version Format Date Size
E7-TR configuration description 2.0 23/05/2014 4.70 MB
E7-TR_H product configuration options 4.2 22/11/2022 -
E7-TR_F product configuration options 4.2 13/01/2023 -
Protecta products can be ordered by using an Order Code. This code specifies the hardware and the configuration.
Please always refer to a valid Order Code when placing an order.
The Order Code page can be opened by clicking the link below.
E7-TR_H: 42hp_35_rj_on_order_tr_2w.jpg E7-TR_F: 84hp_35_rj_on_order_tr_2w.jpg
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