ABB RET670 Installation And Commissioning Manual

13. Using the local HMI, set Transformer 2 to Master of the parallel group and
T1 to Follower (in that order) and repeat steps 9 to 11. Undertake this same
test by setting each Transformer in turn to Master.
14. Note that voltage regulation will be mutually blocked if no transformer is set
to Master in the parallel group. To confirm this function, set T1 as Master in
the parallel group and allow automatic voltage regulation to occur in a way
that the measured bus voltage is stable around USet. Without allocating a new
Master, set T1 to Follower and note the Automatic block state on the local
HMI for all parallel transformers.
15. Restore T1 to Master of the parallel transformer group and ensure that control
mode for each transformer is Automatic, OperationPAR is set to MF and
settings for USet are restored to normal in the service values.
14.1.1.6 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
Section 14 1MRK 504 088-UEN C
Primary injection testing
212
Installation and commissioning manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24