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Test Switch
Check the functions of all test switches that are installed for the purposes of secondary testing and isolation of
the device. Of particular importance are "test switches " in current transformer circuits. Be sure these switches
short-circuit the current transformers when they are in the test mode.
3.2.7
Checking System Incorporation
General Information
WARNING!
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Therefore, only qualified people who are familiar with and adhere to the safety procedures and precautionary
measures shall perform the inspection steps.
With this check of the protection, the correct incorporation of the device into the power system is tested and
ensured.
Checking of protection parametrization (allocations and settings) in accordance with the power system require-
ments, is an important test step here.
The interface-wide incorporation check in the power system results on the one hand in testing of cubicle wiring
and drawing record in accordance with functionality, and on the other hand the correctness of cabling between
transducer or transformer and protection device.
Auxiliary Voltage Supply
Check the voltage magnitude and polarity at the input terminals.
Note
If a redundant supply is used, there must be a permanent, i.e. uninterruptible connection between the minus
polarity connectors of system 1 and system 2 of the DC voltage supply (no switching device, no fuse), because
otherwise there is a risk of voltage doubling in case of a double earth fault.
Caution!
Be careful when operating the device on a battery charger without a battery
Non-observance of the following measure can lead to unusually high voltages and consequently, the
destruction of the device.
Do not operate the device on a battery charger without a connected battery. (Limit values can be found in the
technical data).
Visual Check
During the visual check the following must be considered:
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
Mounting And Commissioning
3.2 Checking Connection
81
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