ABB RET670 Installation And Commissioning Manual

12. Check that all trip and alarm contacts operate according to the configuration
logic.
13. Switch off the injection current and check from the service menu readings of
thermal status and LOCKOUT that the lockout resets at the set percentage of
heat content.
14. Activate the digital input for cooling input signal to switch over to base
current IBase2.
Wait 5 minutes to empty the thermal memory and set Time Constant 2 (Tau2)
in accordance with the setting plan.
15. Test with injection current 1.50 · IBase2 the thermal alarm level, the operate
time for tripping and the lockout reset in the same way as described for stage
IBase1.
16. Finally check that start and trip information is stored in the event menu.
13.6.6.2 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.
13.6.7 Breaker failure protection CCRBRF
Prepare the IED for verification of settings as outlined in section "Overview" and
section "Preparing for test" in this chapter.
The breaker failure protection function CCRBRF should normally be tested in
conjunction with some other function that provides
a start signal. An external
START signal can also be used.
To verify the settings in the most common back-up trip mode 1 out of 3, it is
sufficient to test phase-to-earth faults.
At mode 2 out of 4 the phase current setting, IP> can be checked by single-phase
injection where the return current is connected to the summated current input. The
value of residual (earth fault) current IN set lower than IP> is easiest checked in back-
up trip mode 1 out of 4.
13.6.7.1 Checking the phase current operate value,
IP>
The check of the IP> current level is best made in FunctionMode = Current and
BuTripMode = 1 out of 3 or 2 out of 4.
1. Apply the fault condition, including START of CCRBRF, with a current
below set IP>.
2. Repeat the fault condition and increase the current in steps until a trip occurs.
3. Compare the result with the set IP>.
4. Disconnect AC and START input signals.
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
146
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