ABB RET670 Installation And Commissioning Manual

Checking the re-trip with current check,
RetripMode = CB Pos Check
1. Set RetripMode = CB Pos Check.
2. Apply the fault condition, including start of CCRBRF, well above the set
current value.
3. Verify that re-trip is achieved after set time t1 and back-up trip after time t2
4. Apply the fault condition, including start of CCRBRF, with current below set
current value.
5. Verify that no re-trip, and no back-up trip is obtained.
6. Disconnect AC and START input signals.
Checking re-trip without current check,
RetripMode = No CBPos Check
1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including start of CCRBRF, well above the set
current value.
3. Verify that re-trip is achieved after set time t1, and back-up trip after time t2.
4. Apply the fault condition, including start of CCRBRF, with current below set
current value.
5. Verify that re-trip is achieved after set time t1, but no back-up trip is obtained.
6. Disconnect AC and START input signals.
13.6.7.5 Verifying the back-up trip mode
In the cases below it is assumed that FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
Use the actual tripping modes. The case below applies to re-trip with current check.
1. Apply the fault condition, including start of CCRBRF, with phase current
well above set value IP.
2. Arrange switching the current off, with a margin before back-up trip time, t2.
It may be made at issue of re-trip command.
3. Check that re-trip is achieved, if selected, but no back-up trip.
4. Disconnect AC and START input signals.
The normal mode BuTripMode = 1 out of 3 should have been verified in the tests
above. In applicable cases the modes 1 out of 4 and 2 out of 4 can be checked.
Choose the mode below, which corresponds to the actual case.
Checking the case
BuTripMode = 1 out of 4
It is assumed that the earth-fault current setting IN> is below phase current setting
IP>.
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
148
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