ABB REG670 - High Impedance Differential Protection HZPDIF (87); Verifying the Settings

13.3.2 High impedance differential protection HZPDIF (87)
SEMOD55257-42 v3
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
13.3.2.1 Verifying the settings
SEMOD55257-46 v5
1. Connect single-phase or three-phase test set to inject the operating voltage. The
injection is done across the measuring branch.
The required trip and alarm voltage, as well as the used stabilizing
resistance value must be set in the function. Note as well that used
CT input in the IED must have ratio set as 1:1. This is essential
for the measurement of the expected value. Normally a slightly
higher operating value is no problem as the sensitivity is not
influenced much.
2. Increase the voltage and make note of the trip value Pickup. This is done by
manual testing and without trip of the test set.
3. Connect the trip contact to the test set to stop the test set for measurement of trip
times below.
4. Reduce the voltage slowly and make note of the reset value. The reset value must
be high for this function.
5. Check the operating time by injecting a voltage corresponding to 1.2 ˣ Pickup
level. Make note of the measured trip time.
6. If required, verify the trip time at another voltage. Normally 2 ˣ Pickup is
selected.
7. If used, measure the alarm level operating value. Increase the voltage and make
note of the trip value AlarmPickup. This is done with manual test and without trip
of the test set.
8. Measure the operating time on the alarm output by connecting the stop of the test
set to an output from tAlarm. Inject a voltage 1.2 ˣ AlarmPickup and measure the
alarm time.
9. Check that trip and alarm outputs trip according to the configuration logic.
10. Finally check that pickup and alarm information is stored in the event menu and
if a serial connection to the SA is available verify that the correct and only the
required signals are presented on the local HMI and on the SCADA system.
Information on how to use the event menu is found in the operator's
manual.
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 143
Commissioning manual