ABB RET670 Commissioning Manual

Checking the case without re-trip, RetripMode = Retrip Off
1. Set RetripMode = Retrip Off.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above the
set current value.
3. Verify that no re-trip, but back-up trip is achieved after set time.
4. Disconnect AC and BFI_3P input signals.
Checking the re-trip with current check,
RetripMode = CB Pos Check
1. Set RetripMode = CB Pos Check.
2. Apply the fault condition, including initiation of CCRBRF (50BF), 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 initiation of CCRBRF (50BF), with current
below set current value.
5. Verify that no re-trip and no back-up trip are obtained.
6. Disconnect AC and BFI_3P input signals.
Checking re-trip without current check
1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above the
set current value.
3. Verify that re-trip is achieved after the set time t1, and the back-up trip after time t2.
4. Apply the fault condition, including initiation of CCRBRF (50BF), 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 BFI_3P input signals.
11.5.8.5 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 initiation of CCRBRF (50BF), with phase
current well above set value Pickup_PH.
2. Interrupt the current, 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 is obtained.
4. Disconnect AC and BFI_3P input signals.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 193
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