Protection Relays

for Transformer Protection

Transformers represent a fundamental part of Power Systems, which could be heavily affected by their downtime.

Microelettrica solutions protect Transformers from overloads, short circuits, and with differential protection functions ensure that 2-windings and 3-windings transformers are protected against internal fault that may occur, providing a timely trip of the circuit breaker.

DTMR3-TX

3-winding Transformer Differential relay
F
AF  74TCS, 87T

DTMR

2-winding Transformer Differential relay with Restricted Earth-Fault
F
AF  74TCS, 87N, 87T
PROTECTIVE FUNCTION PACKAGES
F   Standard Feeder (ANSI 50/51, 51BF, 50N/51N, 68, 86)
FF   Advanced Feeder (ANSI 46, 49, 50/51, 51BF, 50N/51N, 68, 79, 86)
V   Standard Voltage (ANSI 27, 59, 81, 68, 86)
VV   Advanced Voltage (ANSI 27, 27V1, 59, 59N, 59V2, 68, 81, 86)
M   Motor (ANSI 37, 46, 48, 49, 51LR, 64, 66, 68, 86)
Dir   Directional (ANSI 67, 67N)
AF   Additional Functions
Note: 68, 86 not present in N-DIN series
TECHNICAL SPECIFICATIONS
Pc  Power Continuous
R  Resistance Range
IP  Protection Class
TECHNICAL SPECIFICATIONS
LWH  Dimensions
Vn  Voltage Class
TECHNICAL SPECIFICATIONS
D  Diameter
P  Power
Pst  Pressure
FC  Fire Class
TECHNICAL SPECIFICATIONS
Ue  Rated Voltage
Ith  Thermal Current
Isc  Short Circuit Making and Breaking Capacity
TECHNICAL SPECIFICATIONS
Ue  Rated Voltage
In  Rated Current
p  Poles Number
UC  Utilization Category
TECHNICAL SPECIFICATIONS
Vcc  Rated Maximum Interrupting Voltage
Icn  Rated Short-circuit Capacity
Icw  Rated Short-time Withstand Current

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