Voltage Protection; Two Step Undervoltage Protection Uv2Ptuv; Verifying The Settings - ABB Relion 670 Series REL670 Commissioning Manual

1MRK 506 355-UEN A
10.6
10.6.1
10.6.1.1
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection

Voltage protection

Two step undervoltage protection UV2PTUV

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

Verifying the settings

Verification of START value and time delay to operate for Step 1
1. Check that the IED settings are appropriate, especially the START 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 START signal
appears.
4. Note the operate value and compare it with the set value.
The operate value in secondary volts is calculated according to
the following equations:
For phase-to-earth measurement:
U 1 UBase VT sec
<
× ×
100 VTprim
3
IECEQUATION2430 V1 EN
For phase-to-phase measurement:
U 1 VT sec
<
UBase
× ×
VTprim
100
IECEQUATION2431 V1 EN
5. Increase the measured voltage to rated load conditions.
6. Check that the START 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 × 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:
Section 10
"Preparing the IED to
(Equation 94)
(Equation 95)
171