861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
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Installation
28.3
Checking the circuits of the low-voltage equipment
➭ Check the current transformer circuits according to the circuit diagrams.
➭ Check the functions of all protection devices with a secondary test unit for relays.
28.4
Checking high-voltage connections
➭ Check the tightening torque of the fixing bolts of the cable plugs according to the
manufacturer's instructions.
➭ Check the earthing of the cable termination on all high-voltage cables.
28.5
Checking electrical connections
Checking device
connections
➭ Check the screw-type connections of the devices in the low-voltage compartment at
random with the torque wrench.
➭ Check the plug-in connections of the devices in the low-voltage compartment at random.
Checking auxiliary cable
connections
➭ Check auxiliary cable connections on devices and terminal blocks at random.
➭ Check all auxiliary cable connections on current transformer terminals including slides and
jumpers in the low-voltage compartment.
➭ Check the designation labels on the terminal blocks.
➭ Replace missing labels using the information given in the circuit diagrams.
28.6
Checking protection against environmental influences
For touch-up work on doors and front parts, a paint pen is available on request.
➭ Touch up surface damages.
Fig. 156: Indication at the gas pressure manometer
①
< minimum functional level
②
Minimum functional level
③
Rated functional level 120 kPa
④
Maximum functional level 180 kPa
The data in kPa are values at 20 °C
ambient air temperature
WARNING
Internal arcing and explosion hazard
If a voltage transformer is short-circuited, there will be a considerable current flow. This
considerable current flow implies the risk of internal arcing, and the voltage transformer
can explode and produce a fire. Death, serious injury and considerable property damage
can be the consequence.
➭ Never short-circuit voltage transformers on the secondary side.
➭ Check the voltage transformer circuits from the voltage transformer to the secondary fuse
or short-circuit protective device for short circuits.
➭ Check correct operation of the existing protective devices in the voltage transformer
secondary circuit.