ABB RET670 Commissioning Manual

1. Repeat the check of back-up trip time. Disconnect current and input signals.
2. Activate the input 52FAIL. The output CBALARM (CB faulty alarm) should appear
after set time tCBAlarm. Keep the input activated.
3. Apply the fault condition, including initiation of CCRBRF (50BF), with current
above set current value.
4. Verify that back-up trip is obtained without intentional delay, for example within
20ms from application of initiation.
5. Disconnect injected AC and BFI_3P input signals.
11.5.8.7 Verifying the case
RetripMode = Contact
It is assumed that re-trip without current check is selected, RetripMode = Contact.
1. Set FunctionMode = Contact
2. Apply input signal for CB closed to relevant input or inputs 52a_A (B or C).
3. Apply input signal, or signals for initiation of CCRBRF (50BF).
4. Verify that phase selection re-trip and back-up trip are achieved after set times.
5. Disconnect the trip signal(s). Keep the CB closed signal(s).
6.
7. Apply input signal(s), for initiation of CCRBRF (50BF).
8. Arrange disconnection of CB closed signal(s) well before set back-up trip time t2.
9. Verify that back-up trip is not achieved.
10. Disconnect injected AC and BFI_3P input signals.
11.5.8.8 Verifying the function mode
Current/Contact
To be made only when FunctionMode = Current/Contact is selected. It is suggested to
make the tests in one phase only, or at three-pole trip applications for just three-pole
tripping.
Checking the case with fault current above set value
Pickup_PH
The operation shall be as in FunctionMode = Current.
1. Set FunctionMode = Current/Contact.
2. Leave the inputs for CB close inactivated. These signals should not influence.
3. Apply the fault condition, including initiation of CCRBRF (50BF), with current
above the set Pickup_PH value.
4. Check that the re-trip, if selected, and back-up trip commands are achieved.
5. Disconnect injected AC and BFI_3P input signals.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 195
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