Verifying Settings - ABB REG670 Commissioning Manual

Section 13
Testing functionality by secondary injection
13.6.6.2
230
(
= -
E3 V V
3 N 3T
EQUATION2073-ANSI V1 EN-US
2. Read the value of DV (differential voltage). The value of DV should be close to
the following value:
(
= +
DU V V
3 N 3T
EQUATION2074-ANSI V1 EN-US
3. Decrease the value of the injected voltage V
activated. Check that
DV
=
Beta
V
3 N
EQUATION2331-ANSI V1 EN-US
considering stated accuracy (beta is a setting parameter)
4. Increase the voltage V
voltage V to zero and measure the time delay for the activation of the signals
3N
TRIP and TRIP3H.
The 100% stator ground fault protection also has a fundamental frequency neutral
point overvoltage function (95% stator ground fault protection). This part of the
protection can be tested separately by means of fundamental frequency voltage
injection from a test equipment.

Verifying settings

1. With the generator rotating at rated speed but not connected: check the value of
the following analogue signals: E3 (the magnitude of the 3
voltage in the stator), V
at the neutral side of the generator), V
voltage measured at the terminal side of the generator) and ANGLE (the angle
between the third-harmonic voltage phasors V
should be close to the following value:
(
= -
E3 V V
3 N 3T
EQUATION2077-ANSI V1 EN-US
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
) (
2
× + ×
cos(ANGLE) V
3T
) (
2
× +
cos(ANGLE) V
3T
so that the pickup signal falls. After that, switch the
3N
(the magnitude of the third-harmonic voltage measured
3N
(the magnitude of the third-harmonic
3T
) (
2
× + ×
cos(ANGLE) V
3T
1MRK 502 073-UUS A
)
2
sin(ANGLE)
)
2
×
sin(ANGLE)
until the signal PICKUP3H is
3N
rd
harmonic induced
and V ). The value of E3
3N 3T
)
2
sin(ANGLE)
Commissioning manual
(Equation 101)
(Equation 102)
(Equation 103)
SEMOD158990-144 v3
(Equation 104)