10.4.16.2
Completing the test
Continue to test another function or end the test by changing the
TestMode
setting to
Off
. Restore connections and settings to their original values, if they were changed for
testing purposes.
10.5
Voltage protection
10.5.1
Two step undervoltage protection UV2PTUV
Prepare the IED for verification of settings outlined in section
10.5.1.1
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
UBase
VT
VTprim
1
100
3
<
×
×
sec
IECEQUATION2430 V1 EN
(Equation 20)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
<
×
×
sec
IECEQUATION2431 V1 EN
(Equation 21)
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<.
Section 10
1MRK 511 360-UEN A
Testing functionality by secondary injection
118
Bay control REC670 2.1 IEC
Commissioning manual