Mounting; Primary Connection - ABB TDO 6 Instructions For Installation, Use And Maintenance Manual

4.5 Mounting

General and detailed information regarding mounting procedure
may differ depending on voltage transformer type and version.
Follow the technical specifications included in catalogues,
dimensional drawings and rating plates for specific voltage
transformer type and mounting instructions.
Outdoor voltage transformer may be mounted in vertical position
only (with terminal of primary winding facing the top). For other
mounting positions consult the manufacturer. Fasten the voltage
transformer metal baseplate using the four M10 screws with
washers or with two metal profiles and M12 screws depending on
the version of voltage transformer. An M8 or M12 earthing screw
is available on the baseplate for grounding the voltage transformer,
depending on version (see dimensional drawing for exact location).
Tightening torque for steel screws used in voltage transformers
Screw Min. Torque [Nm]
M5 2.8
M6 3
M8 16
M10 20
M12 56
Maximum allowed torque for primary terminals screw connections is 20 Nm.

4.5.1 Primary connection

– Terminal screw connections may be tightened with maximum
allowed torque of 20 Nm.
– Maximum allowed cantilever strength is 1000 N.
The primary terminals are located on the top surface of voltage
transformers (see dimensional drawings).
Figure 4. Primary terminals for double-pole insulated VT – TDO 6 – nuts M10.
Figure 5. Primary terminal for single-pole insulated VT – TJO 6 – nut M10.
Figure 6. Primary terminal for single-pole insulated VT – TJO 7 – nut M12.
Max. torque [Nm]
3.5
4
20
35
70
Figure 7. Primary terminal for single-pole insulated VT – VOG-24 – nut M10.
Figure 8. Primary terminals for double-pole insulated VT – VOL-24 – nuts M10.
Figure 9. Primary terminals for double pole insulated VT – VOL-40.5 – nuts M12.
Instruction manual 7