Features
•
IDMTL phase overcurrent stage ( 50/ 51)
•
3 DTL phas
e overcurrent stages ( 50)
•
IDMTL earth
-
fault stage ( 50N/ 51N)
•
3 DTL earth
-
fault stages ( 50N)
•
2 instantaneous and DTL SEF/ REF stages with harmonic rejection ( 50N)
•
Trip circuit supervision ( 74TC)
•
Circuit breaker failure protection ( 50BF)
•
Single pole, three pol
e and four pole variants
•
True RMS measurement
•
Status inputs with independent pick
-
up and drop
-
off timers and logic inversion to reduce scheme
engineering
•
Flexible supply voltage ranges
•
Low AC/ DC burden
•
Eight independent settings groups
•
Self, hand and elect
rical reset contacts
•
Extensive fault, sequence of event and disturbance recorder
•
IEC60870
-5-
103 fibre
-
optic communications
•
Modbus RTU communications
•
Continuous self
-
supervision of operation and power supply