Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
429
Amplitudes
Read out voltages in all three phases in the operational measured values and compare with the actual voltages.
The voltage of the positive sequence system U
1
must be approximately the same as the voltage values indi-
cated for the phase-earth voltages. If there are significant deviations, the voltage transformer connections are
incorrect.
Phase Rotation
The phase rotation must conform to the configured phase sequence (address 271 PHASE SEQ. under Power
System Data 1); otherwise an indication „Fail Ph. Seq.“ will be output. The allocation of measured
values to phases must be checked and corrected, if necessary. If significant deviations are found, check, and
if necessary correct, the voltage transformer circuits and repeat the test. It is also possible to use for this check
the operational measured value of positive-sequence component U1 of the voltages: With U
1
≠ U
L-E
a wiring
error is indicated.
Measuring Circuit Supervision of the Rotor Earth Fault Protection
If the sensitive earth fault protection is used for rotor earth fault protection, the measuring circuit supervision of
that protection function can be checked with the generator under voltage:
• Start up the generator and excite it to rated voltage. Apply measurement brushes if necessary. Inject a test
voltage between the rotor circuit and the earth by interposing the additional source device 7XR61. The earth
current I
EE
that is flowing now can be read out on the device under the earth fault measured values. The
value obtained is the capacitive spill current flowing in fault-free operation.
• IEE< (address 5106) should be set to about 50 % of this capacitive spill current. It should also be checked
that the set value IEE> (address 5102) is at least twice this measured spill current. Correct the set value if
necessary.
Frequency
The frequency protection function is verified by a plausibility check of the instantaneous machine speed and
the operational measured value indicated.
Overexcitation
The frequency protection function is verified by a plausibility check of the instantaneous machine speed and
the operational measured value indicated.
The voltage tests are completed after the generator has been shut down. The required voltage and frequency
protection functions are activated (address 4001: UNDERVOLTAGE = ON or OFF, address 4101: OVERVOLTAGE
= ON or OFF, address 4201: O/U FREQUENCY = ON or OFF, address 4301: OVEREXC. PROT. = ON or OFF).
Partial functions can be disabled by appropriate limit value settings (e.g. frequency f* set to f
Nom
).
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