TAVRIDA ELECTRIC VCB Series, User Manual, Page: 45 / 142

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Figure 74
Edges of bars 40x10 mm at the place to ISM terminal
connection
Figure 75
Edges of bars 80x10 mm at the place to ISM
terminal connection
M12 bolts fixing busbars (or contact arms) to ISM15_MD_1 or ISM15_MD_3 terminals should be tightened
with a torque of 50±2 Nm.
2) for ISM15_Shell_2
– CBkit_Shell15_1 for 95 kV BIL (75 kV BIL for PCD 150 mm).
3) for ISM15_HD_1
– busbars with width no more than 100 mm (selection of single or double bars depends
on the rated normal current of VCB application). For BIL 95 kV and PCD 210 mm the bars shall have radius
at least 3 mm on their edges and shall be insulated (for example, by shrinkable tube).
Figure 76
Edges of bars 100x10 mm at the place to ISM terminal connection
If insulation kit will not be used compliance with the rated insulation level shall be verified by a voltage test.
M16 bolts fixing busbars (or contact arms) to ISM15_Shell_2 and ISM15_HD_1 terminals should be tightened
with a torque of 60±2 Nm.
To prevent static load on the ISM poles it is not allowed to fasten busbars to the ISM terminal if there is a gap
of more than one millimeter between the busbar and the ISM terminal just before this fastening. Bars shall be
accurately prepared to avoid bending and (or) twisting forces to terminals when these bars are fastened.