Hitachi Relion 670 Series Commissioning Manual page 187

1MRK506371-UUS Rev. M
( )
t s
ANSIEQUATION2428 V1 EN-US
where:
t(s)
TD1
V
Vpickup< Set pickup voltage for step 1
For example, if the measured voltage jumps from the rated value to 0.8 times the set pickup
voltage level and time multiplier TD1 is set to 0.05 s (default value), then the TRST1 and TRIP
signals trip 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.
11.6.1.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.6.2 Two step overvoltage protection OV2PTOV (59)
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
11.6.2.1 Verifying the settings
Verification of single-phase voltage and time delay to trip for Step 1
1. Apply single-phase voltage below the set value Pickup1.
2. Slowly increase the voltage until the PU_ST1 signal appears.
3. Note the trip value and compare it with the set value Pickup1.
For phase-to-ground measurement:
Vpickup
ANSIEQUATION2426 V1 EN-US
For phase-to-phase measurement:
Line distance protection REL670
Commissioning manual
TD 1
=
æ ö
V
-
1
ç ÷
<
Vpickup
è ø
Trip time in seconds
Settable time multiplier of the function for step 1
Measured voltage
The trip value in secondary volts is calculated according to the following equations:
>
VBase VT sec
´ ´
100 VTprim
3
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Testing functionality by secondary injection
"Requirements" and section
Section 11
(Equation 96)
M13796-35 v8
M13796-25 v5
M13806-2 v6
"Preparing
M13806-9 v2
M13806-50 v10
(Equation 97)
181