Completing The Test; Two Step Overvoltage Protection Ov2Ptov; Verifying The Settings - ABB RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.6.1.2
11.6.2
11.6.2.1
206
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 ×
U1<.
For example, if the inverse time curve A is selected, the trip
signals TR1 and TRIP operate after a time corresponding to
the equation:
k
1
t s
( )
=
U
 
1
−
 
U 1
<
 
IECEQUATION2428 V1 EN-US
where:
t(s) Operate time in seconds
k1 Settable time multiplier of the function for step 1
U Measured voltage
U1< Set start voltage for step 1
For example, if the measured voltage jumps from the rated value to 0.8 times
the set start voltage level and time multiplier k1 is set to 0.05 s (default
value), then the TR1 and TRIP signals operate at a time equal to 0.250 s ±
tolerance.
10. The test above can be repeated to check the inverse time characteristic at
different voltage levels.
11. Repeat the above described steps for Step 2 of the function.
Extended testing
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.

Completing the test

Continue to test another function or end the test by changing the TESTMODE
setting to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.

Two step overvoltage protection OV2PTOV

Prepare the IED for verification of settings outlined in Section
to verify settings".

Verifying the settings

Verification of single-phase voltage and time delay to operate for
Step 1
1MRK 504 165-UEN A
(Equation 98)
"Preparing the IED
Transformer protection RET670 2.2 IEC
Commissioning manual
M13796-35 v8
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