ABB RET670 Commissioning Manual

1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured impedance to find the
operating value of the phase-to-phase fault for zone 1 according to test point 1 in
figure 33 and table 28. Compare the result of the measurement with the set value.
3. Repeat steps 1 to 2 to find the operating value for test points 2, 3 in table 28
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
4. Repeat steps
1 to 3 to find the operating value for the phase-to-ground fault C-G
according to figure
34 and table 29.
Test points 8, 9, 10 and 11 are intended to test the directional lines of
impedance protection. Since directionality is a common function for
all six measuring zones, it is only necessary to test 8, 9, 10 and 11
once, in the forward direction in order to test the accuracy of
directionality (directional angles). Directional functionality testing
(trip inside, no-trip outside) should always be made for all
impedance zones set with directionality (forward or reverse).
11.4.7.2 Measuring the operating time of distance protection zones
Procedure:
1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition to find the operating time for the phase-to-phase fault
according to test point 12 in figure 33 and table 28 for zone 1. Compare the result of
the measurement to the setting tPPZ1.
3. Repeat steps 1 to 2 to find the operating time for the phase-to-ground fault according
to test point 12 in figure
34 and table 29. Compare the result of the measurement to
the setting t1PG.
4. Repeat steps 1 to 2 to find the operating time for all other used measuring zones.
The zones that are not tested have to be blocked and the zone that is tested has to be
released.
11.4.7.3 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
136 Transformer protection RET670 2.2 ANSI
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