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Eaton transformer relay

Eaton’s Transformer Relays (ETR4000 and ETR5000) provide users with superior control and backup protection. Instantaneous overcurrent elements allow for quick clearing of severe internal or external faults, and maintenance mode enhances overall safety and protection by reducing fault clearing time and lowering incident energy levels. The ETR’s zone-selective interlocking feature and trip and event recording feature help reduce troubleshooting time, maintenance requirements, and overall costs.

Eaton transformer relay

Eaton’s transformer relay family–EMR Series

Use the following chart to compare the protective funtions of Eaton's E-series transformer relays.

ETR-4000 transformer relay

Eaton ETR-4000 transformer relay

46— Current unbalance elements

87R— Dual-slope percentage restrained current differential with magnetizing inrush and over-excitation blocking

87H— Unrestrained current differential

87GD— Restricted ground fault / ground differential

50P— Instantaneous overcurrent elements with timers

50R— Instantaneous calculated elements with timers

50X— Instantaneous measured elements with timers

51P— Inverse time overcurrent elements

51Q— Negative sequence phase overcurrent elements

51R— Inverse time overcurrent calculated elements

51X— Inverse time overcurrent measured elements

BF— Breaker failure elements

49— Temperature protection

SOTF— Switch onto fault protection

CLPU— Cold load pickup

74TCM— Trip coil monitor

ZI— Zone selective interlocking for bus protection

BF— Breaker failure

ETR-5000 transformer relay

Eaton ETR-5000 transformer relay

The ETR-5000 has all of the same protection functions as the ETR-4000 with additional features.

47— Voltage unbalance elements

27M/59M— Main three-phase under/overvoltage protection

27A/59A— Auxiliary single-phase under/overvoltage protection

81— Frequency elements that can be assigned to: overfrequency, underfrequency, rate of change or vector surge

32— Forward and reverse watts protection

32V— Forward and reverse VARs protection

24— Over-excitation, volts-per-hertz protection

86— Lockout protection

51V— Voltage restraint elements

27T— Low voltage ride-through (LVRT)

27Q— Reactive power and undervoltage

LOP— Loss of potential

Typical one-line example—ANSI protective elements guide

ANSI protective elements guide for Eaton transformer relays

Protective elements key

 Functions on ETR-4000

 Functions on ETR-4000 and ETR-5000

Improved coordination
Zone selective interlocking
Maintenance mode
Improves worker safety

Common software tools

All E-series relays, including our E-series motor relays, use the same software interface for easy access to information and programming of settings. Whether you are using the front panel or the external software, the interface is the same on all models.

  • Operation 
  • System Parameters
  • Protection Parameters
  • Device Parameters
  • Control 
  • Logic 
  • Device Planning 
  • Service
The E-series family platform makes it easy for users to program simple to complex settings or schemes for each of their unique applications.

Eaton's E-Series Relays

    Core features

    • An unrestrained differential element provides fast tripping on heavy internal faults to limit catastrophic damage to the transformer and minimize risks to the remainder of the power system. 
    • Instantaneous overcurrent elements allow quick clearing of severe internal or external (through) faults. 
    • Front panel LCD display with background illumination allows for wide angle viewing in all light conditions, and 14 programmable LEDs provide quick and easy visual display of power on, mode of operation, alarm, and trip indication. 
    • Maintenance Mode improves safety by providing a simple and reliable method to reduce fault clearing time and lower incident energy levels at energized panels. 
    • Complete protection and control in a single compact case reduces panel space, wiring, and costs. 
    • Integral test function reduces maintenance time and expense. 
    • Zone selective interlocking improves coordination and tripping time, and saves money compared to a traditional bus differential scheme. 
    • Trip and event recording in non-volatile memory provides detailed information for analysis and system restoration, reducing trouble shooting time and maintenance costs. 
    • Breaker trip circuit monitoring improves the reliability of the breaker operation. 
    • 4 Voltage inputs provide 3 phase voltage protection and metering information as well as an independent single phase voltage input.

    Unmatched protection

    Eaton’s E-Series microprocessor-based protective relays offer reliable, secure and complete protection and control of power generation and distribution systems. Transformer relays specifically provide you primary protection, control and backup protection of transformers.