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GENERAL INSTRUCTIONS FOR CTC
UNDER POLE COMPACT
TRANSFORMER SUBSTATION
IG-086-GB
version 02
11.07.2007
Once the cable connections to the LVB and to the transformer MV bushings have been
made, the cables will be sealed in the holes in order to obtain an adequate watertightness
level.
3.9. ELECTRICAL
EQUIPMENT REPLACEMENT
To replace the transformer, follow the steps below:
1)
Cut the LV and MV voltage sources.
2)
Lock the breaking switchgear.
3)
Check voltage absence.
4)
Remove the plugs from the cover tips and replace them with the lifting eyebolts of the
CTC
TS, as indicated in chapter 3.7.
5)
Disconnect the protection earth wire (metallic parts) which connects the cover to the
concrete enclosure.
6)
Lift the cover with four chains of the same length (see figure 3.6).
7)
Place the cover on the floor on two boards.
8)
Open the LVB compartment door (see figure 3.8)
9)
Earth the circuit.
10)
Activate the locking of the door-grille of the transformer compartment.
11)
Open the transformer compartment doors.
12)
Disconnect all the MV and LV cables (see chapters 3.8.1, 3.8.2 and 3.8.3)
13)
Remove the transformer by lifting it. (see figure 3.7)
14)
Place the new transformer in the
CTC
TS with the tow-truck.
15)
Connect all bridges (see chapters 3.8.1, 3.8.2 and 3.8.3).
16)
Place the cover on the
CTC
TS and connect the earth cable that connects the cover
with the enclosure.
17)
Remove the eyebolts and place the plugs on the tips.
18)
Restore service to the circuit.
Acera Perimetral
Puesta a Tierra
de Servicio
Puesta a Tierra
de Proteccion
Transformador
Cuadro de Baja Tension
Puentes de Baja Tension
Puentes de Alta Tension
Low Voltage Bridges
Transformer
Low Voltage Board
Medium Voltage Bridges
Perimeter Area
Service Earth
Connection
Protection Earth
Connection
Figure 3.14
:
Elements of the CTC Transformer Substation
