Testing - ABB Relion 670 Series Installation And Commissioning Manual

1MRK 502 029-UEN A
15.7.6.1
Installation and commissioning manual

Testing

The protection function uses measurement of the third-harmonic voltages in the
neutral point of the generator and on the generator terminal (broken delta voltage
transformer connection to the IED).
The test set shall be capable to generate third-harmonic voltages. One voltage
(U ) is connected to the residual voltage input related to the terminal side of the
N3
generator. The second voltage (U
neutral of the generator. The angle between the injected third-harmonic voltages
shall be adjustable.
U
3N
IEC07000127 V1 EN
Figure 100: Typical phasor diagram for third harmonic voltages for healthy
machine
1. Inject the following voltages: U
the voltages = 180°. Check the monitored values of the following analogue
signals: E3 (the magnitude of the third-harmonic induced voltage in the
stator), U : 5 V (the magnitude of the third-harmonic voltage measured at
3N
the neutral side of the generator), U
harmonic voltage measured at the terminal side of the generator) and
ANGLE: 180° (the angle between the third-harmonic voltage phasors U
and U ). The value of E3 should be close to the following value:
3T
(
= -
E3 U U
3 N 3T
EQUATION2070 V1 EN
2. Read the value of DU (differential voltage). The value of DU should be close
to the following value:
(
= +
DU U U
3 N
EQUATION2071 V1 EN
3. Decrease the value of the injected voltage U
activated. Check that
Verifying settings by secondary injection
) is connected to the voltage input related to the
N3
= 15 V, U
3T
: 15 V (the magnitude of the third-
3T
) (
2
× +
cos(ANGLE) U
3T
) (
2
× +
cos(ANGLE) U
3T
Section 15
U
3T
en07000127.vsd
= 5 V and the angle between
3N
)
2
×
sin(ANGLE)
)
2
×
sin(ANGLE)
3T
until the signal START3H is
3N
3N
(Equation 13)
(Equation 14)
199