3 Mounting and Commissioning
270
7UM61 Manual
C53000-G1176-C127-3
In addition the following must be observed:
• Before making any connections, the device must be earthed at the protection earth
terminal.
• Hazardous voltages can exist in all switchgear components connected to the power
supply and to measurement and test circuits.
• Hazardous voltages can be present in the device even after the power supply
voltage has been removed (capacitors can still be charged).
• After removing voltage from the power supply, wait a minimum of 10 seconds before
reenergizing the power supply. This allows defined initial conditions when the
device is re-energized.
• The limit values given in the Technical Specifications (Section 3.1) must not be ex-
ceeded, including during testing and commissioning.
DANGER!
Hazardous voltages during interruptions in secondary circuits of current trans-
formers
Nonobservance of the following measure will result in fatality, severe personal injury
or substantial material damage.
Short-circuit the current transformer secondary circuits before current connections to
the device are opened.
If a test switch is available that short-circuits automatically the secondary lines of the
current transducer, it will be sufficient to set it to "Test" position, provided the short-cir-
cuiters have been checked previously.
All secondary test equipment should be removed and the measurement voltages con-
nected. The operational preparations must be completed. Primary tests are performed
with the generator.
Testing Sequence This is accomplished normally in the following order
• Short circuit tests,
• Voltage tests,
• Earth fault tests,
• Synchronization,
• Load tests 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 then be activated one after the
other. If a protection function is not required at all, it should be set in the configuration
as Disabled (see Section 2.2.2). It is then ignored in the 7UM61 device.
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