Mounting and Commissioning
3.2 Checking Connections
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
396
Because of the odd vector group numeral, the following pickup values apply
Wiring
It is particularly important to check the correct wiring and allocation of all device interfaces. The margin heading
titled„Test function for checking the binary inputs and outputs“ provides additional information to this end.
For checking the analog inputs a plausibility check can be conducted as described above under the margin title
„Secondary Testing“
Function Check
The only functional test required for protective relays is a plausibility check of the operational measured values
by means of some secondary test equipment; this is to ensure that no damage has occurred during transit (see
also margin title „Secondary Testing“).
Undervoltage Protection 27
Note
If in the device undervoltage protection function is configured and activated, the following must be considered:
Special measures have been taken to ensure that the device does not pick up immediately after applying the
auxiliary power supply, as a result of the absent measuring voltage. However, the device does pick up as soon
as operating state 1 (measured values exist) has been attained.
LEDs
After tests where the displays appear on the LEDs, these should be reset so that they supply only information
on the test just performed. This should be done at least once each using the reset button on the front panel and
via the binary input for remote reset (if allocated). Observe that an independent reset occurs also on the arrival
of a new fault and that setting of new indications can be optionally made dependent on the pickup or a trip
command (parameter 610 FltDisp.LED/LCD).
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.
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