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.
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
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
Functions on ETR-4000
Functions on ETR-4000 and ETR-5000
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.