Verifying Settings - ABB RELION REG670 Commissioning Manual

1MRK 502 067-UEN B
U
3N
IEC07000127 V1 EN-US
Figure 63: Typical phasor diagram for third harmonic voltages for healthy machine
1. Inject the following voltages: U
180°. Check the monitored values of the following analogue signals: E3 (the magnitude of
the third-harmonic induced voltage in the stator), U
harmonic voltage measured at the neutral side of the generator), U
magnitude of the third-harmonic voltage measured at the terminal side of the generator)
and ANGLE: 180° (the angle between the third-harmonic voltage phasors U
The value of E3 should be close to the following value:
E3
EQUATION2070 V1 EN-US
2. Read the value of DU (differential voltage). The value of DU should be close to the
following value:
DU
EQUATION2071 V1 EN-US
3. Decrease the value of the injected voltage U
Check that
DU
U
EQUATION2072 V2 EN-US
considering stated accuracy (
4. Increase the voltage U
zero and measure the time delay for the activation of the signals TRIP and TRIP3H.
The 100% stator earth fault protection also has a fundamental frequency neutral point
overvoltage function (95% stator earth fault protection). This part of the protection can
be tested separately by means of fundamental frequency voltage injection from a test
equipment.
12.6.6.2

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
stator), U
the generator), U
Commissioning manual
(
= - ×
U U cos(ANGLE)
3 N 3T
(
= + ×
U U cos(ANGLE)
3 N 3T
=
Beta
3 N
so that the sart signal falls. After that, switch the voltage U
3N
(the magnitude of the third-harmonic voltage measured at the neutral side of
3N
(the magnitude of the third-harmonic voltage measured at the
3T
en07000127.vsd
= 15 V, U = 5 V and the angle between the voltages =
3T 3N
3N
) (
2
+ ×
U sin(ANGLE)
3T
) (
2
+ ×
U sin(ANGLE)
3T
until the signal START3H is activated.
3N
beta is a setting parameter)
Testing functionality by secondary injection
U
3T
: 5 V (the magnitude of the third-
: 15 V (the
3T
3N
)
2
)
2
rd
harmonic induced voltage in the
Section 12
and U ).
3T
(Equation 100)
(Equation 101)
(Equation 102)
to
3N
SEMOD158990-144 v3
191