Mode Of Operation - Siemens 7XV75 Manual

Application
The test switch serves in the test-
ing of protection devices using
secondary injection test sets.
The following versions are in a
flush mounting case available:
• For feeder protection without an
open starpoint.
• For feeder protection without an
open starpoint and with addition-
al contacts.
• For feeder protection without an
open starpoint for two CT cores
or separate earth fault CT.
• For feeder protection with an
open starpoint.
• For feeder protection with an
open starpoint and independent
switchable trip and c.t. circuits.
• For a 3-winding transformer
differential protection.
• For feeder protection without an
th
open starpoint, with 4 CT and
th
4 VT input (three-stage test
switch)
The test device can be used with
auxiliary supplies ranging from
24 V to 250 V AC/DC. This makes
selection between varying power
supply models unnecessary.
NOTE
Grounding
The equipment must be grounded at the grounding terminal

Mode of operation

The 7XV75 test switch serves for
testing protection devices includ-
ing C.T. circuits and command
contacts. With the help of the
switches located on the front
side, the current and voltage
inputs as well as the circuits of
the protection device to be tested
are interrupted and applied to the
plug-in connector located on the
front side. Via this plug-in con-
nector currents and voltages can
be fed by an injection test set
and the different commands and
indications can be tested.
2
7XV75 Test Switch
7XV75 Test Switch
before any connections are made.
Siemens AG March 2021