ABB Relion 670 Series Commissioning Manual page 189

1MRK 506 371-UUS E
11.6 Voltage protection
11.6.1 Two step undervoltage protection UV2PTUV (27)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
11.6.1.1 Verifying the settings
Verification of pickup value and time delay to trip for Step 1
1. Check that the IED settings are appropriate, especially the PICKUP value, the definite time
delay and the
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the PICKUP signal appears.
4. Note the trip value and compare it with the set value.
For phase-to-ground measurement:
Vpickup
ANSIEQUATION2430 V1 EN-US
For phase-to-phase measurement:
Vpickup
ANSIEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the PICKUP signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower than the
measured trip value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 × Vpickup<.
( )
t s
ANSIEQUATION2428 V1 EN-US
Line distance protection REL670
Commissioning manual
in this chapter.
1 out of 3 operation mode.
The trip value in secondary volts is calculated according to the following
equations:
<
VBase VT sec
´ ´
100 VTprim
3
<
VT sec
´ ´
VBase
100 VTprim
For example, if the inverse time curve A is selected, the trip signals TRST1 and
TRIP trip after a time corresponding to the equation:
TD 1
=
æ ö
V
-
1
ç ÷
<
Vpickup
è ø
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Testing functionality by secondary injection
"Requirements" and
(Equation 94)
(Equation 95)
(Equation 96)
Section 11
SEMOD53540-1 v1
M13796-2 v6
M13796-9 v3
M13796-29 v10
183