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Operating instructions
6
6 - 48
Siemens AG ⋅ May 1998
6.5 Testing and commissioning
Pre-requisite for commissioning is the completion of
the installation procedures detailed in chapter 5.
During the operation of electrical equipĆ
ment, dangerous voltages are present
on certain parts of the plant. Therefore,
bodily harm and/or severe damage to
equipment may occur if every action is
not carried out with the utmost care.
Only qualified personnel which is thorĆ
oughly familiar with the relevant safety
precautions and safety measures as
well as with the warnings contained in
this equipment manual should be perĆ
mitted to work with this protection sysĆ
tem.
In particular, the following should be obĆ
served:
D Before making any other connecĆ
tions, the unit must be earthed at the
protective earth connection.
D Dangerous voltages may be present
on parts which are connected to the
power supply and to the measuring
inputs.
D Dangerous voltages can still be presĆ
ent even after the supply voltage has
been disconnected (capacitor storĆ
age).
D The limit values stated in the chapter
"Technical Data" must not be exĆ
ceeded; this applies also for testing
and commissioning.
!
"
!
!
If a test switch is installed which autoĆ
matically short-circuits the current transĆ
former secondary leads, then it is suffiĆ
cient to move this switch to the "Test"
position. The short-circuit switch must,
however, be checked beforehand.
It is recommended to perform testing with the actual
setting values of the protection system. If these are
not (or not yet) known then testing should be carried
out with the preset values. The following testing proĆ
cedures are based on the preset setting values; for
other setting values formulae have been provided.
For functional testing, one or two three-phase symĆ
metrical current sources, with individually adjustable
current are required.
The measuring accuracy which can be
achieved depends on the electrical perĆ
formance data of the test sets. The acĆ
curacy stated in the "Technical Data"
can only be achieved if the reference
conditions according to DIN VDE
0435/part 303 or IEC 255 are met and if
precision instruments are used. GeneralĆ
ly, tests using secondary test sets are to
be regarded as being functional tests.
During all tests it is important to check that the proper
indications appear on the LEDs and the proper signals
appear at the outputs of the remote signalling relays.
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