Completing The Test; Loss Of Voltage Check Lovptuv; Measuring The Operate Limit Of Set Values - ABB RELION REG670 Commissioning Manual

Section 12
Testing functionality by secondary injection
terminal side of the generator) and ANGLE (the angle between the third-harmonic
voltage phasors U
E3
EQUATION2076 V1 EN-US
Make sure that ANGLE has a value bigger than 125°
2. Read the value of DU (differential voltage). The value of DU should be close to the
following value:
DU
EQUATION2078 V1 EN-US
3. Read the value of BU (bias voltage:
a non-faulted generator.
4. After synchronization of the generator the ratio DU/BU is checked for different load
levels of the generator. These different monitoring of load levels should be the base for
the setting of
If the function is used with the option of neutral point measurement only the test is
performed by check of this voltage. The operate value should be above the measured
residual third-harmonic voltage in the neutral point at normal operation (non-faulted
generator).
12.6.6.3

Completing the test

Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.6.7

Loss of voltage check LOVPTUV

Prepare the IED for verification of settings as outlined in section
section
12.6.7.1

Measuring the operate limit of set values

1. Check that the input logical signals BLOCK, CBOPEN and VTSU are logical zero.
2. Supply a three-phase rated voltage in all three phases and note on the local HMI that the
TRIP logical signal is equal to the logical 0.
3. Switch off the voltage in all three phases.
After set
local HMI.
4. Inject the measured voltages at rated values for at least set
5. Activate the CBOPEN binary input.
6. Simultaneously disconnect all the three-phase voltages from the IED.
No TRIP signal should appear.
7. Inject the measured voltages at rated values for at least set
8. Activate the VTSU binary input.
192
and U
3N
(
= - ×
U U cos(ANGLE)
3 N 3T
(
= + ×
U U cos(ANGLE)
3 N 3T
beta .
"Preparing for test" in this chapter.
tTrip time a TRIP signal appears on the corresponding binary output or on the
Note that TRIP at this time is a pulse signal, duration should be according
tPulse .
to set
). The value of E3 should be close to the following value:
3T
) (
2
+ ×
U sin(ANGLE)
3T
) (
2
+ ×
U sin(ANGLE)
3T
Beta ·U ). The ratio DU/BU should be well below 1 for
3N
1MRK 502 067-UEN B
)
2
(Equation 103)
)
2
(Equation 104)
TestMode setting to Off .
"Requirements" and
tRestore time.
tRestore time.
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