54 UNIGEAR ZS2 INSTALLATION, OPERATION AND MAINTAINANCE INSTRUCTION MANUAL
• Visually check the connections of the current
transformers.
• Using a dynamometric spanner, check the
tightness of all the screws. Refer to the section
6 for the tightening values.
Cleaning and checking of the voltage
transformers
Fixed version voltage transformers:
• Open the cable compartment rear cover
• Visually check the voltage transformer
connections.
• Using a dynamometric spanner, check the
tightness of all the screws. Refer to the section
6 for the tightening values.
• Carry out a visual inspection of the
transformers and check for any presence
of dirt.
• Remove any deposits of dust using a dry cloth
that does not leave any deposits on the
treated surfaces (do not use woolen cloths).
Bus side Voltage transformer in removable
version:
• Open the Circuit Breaker compartment lower
rear cover.
• Manually withdraw the VT truck by using VT
extraction truck
• Carry out a visual inspection of the
transformers and check for any presence
of dirt.
• Remove any deposits of dust using a dry cloth
that does not leave any deposits on the
treated surfaces (do not use woollen cloths).
3 1 2
—
Figure 82- View of the busbar compartment, shown without
insulating covers.
1. Dropper
2. Rear cover of busbar compartment, removable
3. Bushings
3
1
2
—
Figure 84- Manual earthing switch operating mechanism.
1. Drive shaft
2. Auxiliary contact
1 2
9.4.3 Maintenance of Circuit-Breaker
compartment
Lubrication of the isolating contacts:
• Remove any deposits of dust using a dry cloth
that does not leave any deposits on the
treated surfaces (do not use woollen cloths).
—
Figure 83-: Internal view of the cable connection compartment
1. Earthing switch position indicator
2. Cable connection bar
3. Cable clamp
—
Figure 85 -Bus Side Voltage Transformer in Circuit Breaker
compartment
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