'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
5 - 8
Siemens AG ⋅ May 1998
The following checking procedure is partially performed in the presence of dangerous voltages. The
procedures should only be performed by appropriately qualified personnel who are familiar with the
safety regulations and safety precautions and follow these.
The connections are shown in annex A.1.4. The confiĆ
guration options for the binary inputs are described in
chapters 5.4 and 6.
Before switching on the protection system, all electriĆ
cal and optical external connections have to be chekĆ
ked for correct interface:
D Switch off the MCB for the DC supply in the powĆ
er supply rack
D Check the continuity and correctness of all current
transformer circuits against the plant and connecĆ
tion diagrams:
- Are the current transformers correctly earthed?
- Are the polarities of the current transformers conĆ
nections consistent?
- Is the phase relationship of the current transĆ
former consistent?
D Fibre-optical connections between master unit
and bay units.
It must be ensured that each ZPS-SK
module in the subrack is connected to
an LMZ module.
D Check the tripping circuits through to the circuit
breakers (no primary switching as yet).
D Check the control wiring to and from other deĆ
vices.
D Check the signal circuits.
D Measure the auxiliary voltage at the cubicle termiĆ
nals ; check its polarity and the polarity of the digiĆ
tal input connection.
If connections are correct, then the auxiliary voltĆ
age MCB can be closed.
After the protection system has run up successfully,
the disturbance indication (LED red) extinguishes and
the operation indication (LED green) lights up on the
master unit as well as on each connected bay unit.
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