Testing Voltage Protection Functions; Two Step Undervoltage Protection Uv2Ptuv (27); Verifying The Setting - ABB Relion 650 Series Commissioning Manual

1MRK 505 289-UUS B
7.5

Testing voltage protection functions

7.5.1

Two step undervoltage protection UV2PTUV (27)

Prepare the IED for verification of settings as outlined in the section
settings".
Values of the logical signals for UV2PTUV (27) are available on the local HMI under Main menu/
Tests/Function status/Voltage/UV2PTUV(27,2U<)/UV2PTUV:1. The Signal Monitoring in PCM600
shows the same signals that are available on the local HMI.
7.5.1.1

Verifying the setting

Verification of PICKUP value and time delay to operate 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 operate 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 operate 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
Busbar protection REB650
Commissioning manual
1 out of 3 operation mode.
The operate 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 operate after a time corresponding to the equation:
TD 1
=
æ ö
V
-
1
ç ÷
<
Vpickup
è ø
© Copyright 2013 ABB. All rights reserved
Section 7
Testing functionality
M13796-2 v6.1.1
"Preparing the IED to verify
(Equation 1)
(Equation 2)
(Equation 3)
M13796-29 v6
53