Voltage Protection; Two Step Undervoltage Protection Uv2Ptuv (27); Verifying The Settings - ABB Relion 670 Series Commissioning Manual

1MRK 511 409-UUS Rev. J
11.5

Voltage protection

11.5.1

Two step undervoltage protection UV2PTUV (27)

Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
11.5.1.1

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 1 out of 3 operation mode.
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
where:
t(s)
Phasor measurement unit RES670
Commissioning manual
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
Trip time in seconds
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Testing functionality by secondary injection
"Requirements" and section
Section 11
SEMOD53540-1 v1
M13796-2 v6
"Preparing
M13796-9 v3
M13796-29 v11
(Equation 89)
(Equation 90)
(Equation 91)
119