Make sure that ANGLE has a value bigger than 125°
2. Read the value of DV (differential voltage). The value of DV should be close to
the following value:
( ) ( )
2 2
3N 3T 3T
DV V V cos(ANGLE) V sin(ANGLE)= + × + ×
EQUATION2079-ANSI V1 EN-US (Equation 105)
3. Read the value of BV (bias voltage: Beta ·V
3N
). The ratio DV/BV should be well
below 1 for a non-faulted generator.
4. After synchronization of the generator the ratio DV/BV is checked for different
load levels of the generator. These different monitoring of load levels should be
the base for the setting of beta.
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).
13.6.6.3 Completing the test
SEMOD158990-34 v3
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes.
13.7 Frequency protection
SEMOD53547-1 v1
13.7.1 Underfrequency protection SAPTUF (81)
M16289-2 v7
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
13.7.1.1 Verifying the settings
M16289-15 v3
Verification of PICKUP value and time delay to trip
M16289-17 v7
1. Check that the IED settings are appropriate, for example the pickup value and the
time delay.
2. Supply the IED with three-phase voltages at their rated values and initial
frequency.
The initial frequency is calculated using Equation 106.
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 231
Commissioning manual
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