4. Basic Design
4.1 Disconnecetor
Figure 3 and Table 1 contain the most important components of the type SGF two-column rotary
disconnector.
Figure 3 : Basic design of type SGF two-column rotary disconnector
Table 1 : Basic design of type SGF two-column rotary disconnector
Designation Item No. Remarks
Disconnector base 2 Consisting of : Sectional steel base frame
(221),rotary pedestals (70),diagonal rod(68)
Rotary pedestals 70 Enclosed, maintenance-free, on stud bolt for
adjustment
Support insulator 201 —
Rotary heads 284 Enclosed, maintenance-free, swivelling
0
range 360
Current paths 5, 6 Welded aluminium construction, corrosion-
resistant
Contact finger 66 Cu-Cr-Zr alloy, silver-faced
Contact pieces 67 Cu, silver-faced
High-voltage terminals 17 Flat terminal to DIN 46 203 with :
- 4 bore holes : For rated currents < 1 600 A
- 8 bore holes : For rated currents > 1 600 A
and NEMA
Operating mechanism 75 Optionally : Motor-operated or manual
4/113
1HDB 050016-YN-A
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