ABB REF615 L User Manual

applications where two or more power transformers are connected to the same
busbar at the same time. The parallel operation modes of OLATCC are Master/
Follower (M/F), Minimizing Circulating Current (MCC) and Negative Reactance
Principle (NRP).
Configuration example for the Manual and Auto single modes
M
U12b
IL1b, IL2b, IL3b
VT_
CT_
IED
TCO
LOWER RAISE
+
+
-
+
TAP_POS
Tap position indication (e.g. mA -signal)
-
+
Auto /
Manual
-
+
Lower
-
+
Raise
AUTO
RAISE_LOCALLOWER_LOCAL
GUID-88A1D370-2203-48CA-9843-76C309B4049D V4 EN
Figure 402: Basic connection diagram for the voltage regulator
Section 9 1YHT530004D05 D
Control functions
752 615 series
Technical Manual

ABB REF615 L Specifications

General

Type	Feeder Protection Relay
Rated Frequency	50/60 Hz
Weight	Approx. 1.5 kg
Communication Protocols	IEC 61850, Modbus RTU, DNP3
Protection Functions	Overcurrent, Earth fault, Thermal overload, Under/Over voltage, Under/Over frequency
Enclosure	IP20