Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
416
Testing Sequence
Primary testing is usually performed in the following order:
• Short circuit tests
• Voltage tests
• Earth fault tests
• Synchronization
• Load measurements at the network
The following instructions are arranged in this sequence. All protection functions should be initially switched off
(condition as delivered from factory) so that they do not influence one another. With the primary tests, they will
then be activated one after the other. If a protection function is not required at all, it should be set in the config-
uration as Disabled (see Section 2.4.2). It is then ignored in the 7UM62device.
The effective switching of a protection function configured as existing can occur in two ways. The setting
addresses concerned are shown in the respective sections.
• Protection function Block. Relay : The protection function is operative and outputs indications (also trip-
ping 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 command is not allocated to any trip relay,
tripping does not occur.
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 time-overcurrent protection function roughly to the nominal generator 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 ex-
citation
Sampling Frequency Adaptation
The device contains integrated frequency correction; this ensures that the protection functions are always pro-
cessed 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 frequency correction can operate. If a measurement
value of 0 is switched in without a different measurement value having been present beforehand, an additional
time delay of approximately 120 ms is incurred since the device must firstly calculate the frequency based on
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 the duration of the parameterized reset time (TMin
TRIP CMD) (refer also to Section 2.5)
Factory Setting
When the protection device is delivered from the factory, all protective functions are switched off. This has the
advantage that each function can be separately tested without being influenced by other functions. The re-
quired functions must be activated for testing and commissioning.
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