Checking the Connections
261
7SS52 V4 Manual
C53000-G1176-C182-3
7.2
Checking the Connections
The operational preparations according to Chapter 7.1, page 256 must be completed.
The connection assignments are shown in Chapter A.3, page 342. The allocating pos-
sibilities of the binary inputs and outputs are described in Chapter A.10, page 383.
Before switching the protection system on, check that the following external electrical
and optical links are correctly connected.
Check the continuity and connections of all current transformer circuits against the
plant and connection diagrams:
−
Are the current transformers correctly earthed?
−
The polarity of a single phase of a current transformer must be consistent. The
polarity of the current transformers of different bay units can be different. But it
must correspond to the parameterized polarity in the DIGSI system projection.
−
Is the phase relationship of the current transformers consistent?
Check the fiber-optic connections between central unit and bay units.
Check the tripping lines to the circuit breaker. The auxiliary voltage must not yet be
switched on:
Check the control wiring to and leading from other devices.
Check the signal circuits.
Check the auxiliary voltage at the cubicle terminals. Check its polarity and the po-
larity of the digital input connection.
Check magnitude of the supply voltage.
Check whether the binary inputs are set to the correct voltages.
When the connections are connected correctly, switch on the miniature circuit
breaker for the supply voltage.
If you have already installed the communication between the central unit and the
bay units (Chapter 3.5, page 39) load the parameters into the central unit and into
the bay units. How to analyze faults in the internal protection communication, can
be found in Chapter 8.2.4, page 295. A faulty bay unit appears in the alarm list. The
alarm list can be called up by pressing the function key
F1
on the central unit.
After the protection system has run up successfully, the red LED (ERROR) goes out
and the green LED (RUN) lights up on the central unit as well as on each connected
bay unit.
Warning!
The following inspection steps are performed in the presence of dangerous voltages.
Only appropriately qualified personnel familiar with and adhering to safety require-
ments and precautionary measures may perform these steps.
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