ABB REG670 - Verifying Settings

( ) ( )
2 2
3N 3T 3T
E3 V V cos(ANGLE) V sin(ANGLE)= - × + ×
EQUATION2073-ANSI V1 EN-US (Equation 101)
2. Read the value of DV (differential voltage). The value of DV should be close to
the following value:
( ) ( )
2 2
3N 3T 3T
DU V V cos(ANGLE) V sin(ANGLE)= + × + ×
EQUATION2074-ANSI V1 EN-US (Equation 102)
3. Decrease the value of the injected voltage V
3N
until the signal PICKUP3H is
activated. Check that
3N
DV
Beta
V
=
EQUATION2331-ANSI V1 EN-US (Equation 103)
considering stated accuracy (beta is a setting parameter)
4. Increase the voltage V
3N
so that the pickup signal falls. After that, switch the
voltage V
3N
to zero and measure the time delay for the activation of the signals
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.
13.6.6.2 Verifying settings
SEMOD158990-144 v3
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
rd
harmonic induced
voltage in the stator), V
3N
(the magnitude of the third-harmonic voltage measured
at the neutral side of the generator), V
3T
(the magnitude of the third-harmonic
voltage measured at the terminal side of the generator) and ANGLE (the angle
between the third-harmonic voltage phasors V
3N
and V
3T
). The value of E3
should be close to the following value:
( ) ( )
2 2
3N 3T 3T
E3 V V cos(ANGLE) V sin(ANGLE)= - × + ×
EQUATION2077-ANSI V1 EN-US (Equation 104)
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
230 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual