3.3 Commissioning
271
7UM61 Manual
C53000-G1176-C127-3
The effective switching of a protection function configured as Enabled can occur in
two ways. The setting addresses for this are specified in the corresponding sections.
• Protection function Block. Relay : The protection function is operative and
outputs indications (also tripping indications) and measured values. However the
trip commands are blocked and not transmitted to the trip matrix.
• Protection function On: The protection function operates and issues indications.
The trip command activates the trip relay allocated for the protection function. If the
protection function is not allocated a trip relay, no tripping occurs.
Preparation Please perform the following preparatory commissioning steps:
• Install an EMERGENCY OFF button for direct trip of the excitation
• Block all protection functions (= Block. Relay)
• Set the instantaneous overcurrent protection function roughly to the nominal gener-
ator current, with tripping for excitation
• Set the instantaneous overvoltage protection function roughly to 30 % of the
nominal generator voltage for the short-circuit test, and to roughly 110 % of the
nominal voltage for the voltage tests, with tripping for excitation
Sampling Frequen-
c y A dap t i on
Note:
The device contains integrated sampling frequency adaption; this ensures that the
protection functions always operate with algorithms matched to the actual frequency.
This explains the wide frequency range and the small frequency influence (refer to
Section 4.34, Technical Data). However this requires that measurement values be
present before a dynamic test can take place, so that the sampling frequency adaption
can operate. If a measurement value is switched from 0 to the device without a differ-
ent measurement value having been present beforehand, an additional time delay of
approximately 120 ms is incurred since the device must firstly calculate the frequency
from the measurement value. Likewise no output signal is possible if no measurement
value is connected. A trip signal, once issued, of course, is maintained for at least for
the parametrized minimum duration (TMin TRIP CMD) (refer also to Section 2.3)
Factory Setting Note:
When the protection device is delivered from the factory, all protective functions have
been switched off. This has the advantage that each function can be separately tested
without being influenced by other functions. The required functions must be activated
for testing and commissioning.
Operating Ranges
of the Protection
Functions
For commissioning tests with the machine, care should be taken that the operating
range of the protection functions as specified in Section 4 is not exceeded and that an
applied measuring value is high enough. Where tests are performed with reduced
pickup values, the pickup value may appear to deviate from the setting value (e.g. in
the unbalance load stage or the earth fault protection) if the protection function is
blocked because of too small measured values, i.e. if operating condition 1 (= protec-
tion function active) is not yet attained.
However, this effect will not interfere with commissioning since no checks of the pickup
values are performed that involve the machine.
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