Completing The Test; Frequency Protection; Underfrequency Protection Saptuf (81); Verifying The Settings - ABB REG670 Commissioning Manual

1MRK 502 073-UUS A
13.6.6.3
13.7
13.7.1
13.7.1.1
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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:
(
= +
DV V V
3 N 3T
EQUATION2079-ANSI V1 EN-US
3. Read the value of BV (bias voltage: Beta ·V
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).

Completing the test

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.

Frequency protection

Underfrequency protection SAPTUF (81)

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

Verifying the settings

Verification of PICKUP value and time delay to trip
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.
Testing functionality by secondary injection
) (
2
× + ×
cos(ANGLE) V
3T
Section 13
)
2
sin(ANGLE)
). The ratio DV/BV should be well
3N
"Preparing the IED to
(Equation 105)
SEMOD158990-34 v3
SEMOD53547-1 v1
M16289-2 v7
M16289-15 v3
M16289-17 v7
231