Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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2.2. Construction and principle of operation
The ONIIIS disconnectors are switches with a vertical movement of knifes of the current path. The base frame
of the disconnector (item 1) is a welded steel frame in which sides the main shaft (item 2) is mounted. On the
transverse shelves of the base frame there are porcelain support insulators (item 3), on which there is a dis-
connector's current path consisting of two fixed contacts (item 4) bolted to the insulators and movable contact
(item 5). The movable contacts of the current path are connected to the main shaft by the driving insulator
(item 6). The rotary movement of the main shaft is transmitted through the driving insulator to the movable
contacts, causing them to move in a plane perpendicular to the base frame. The pressure of the knives on the
contacts is ensured by springs (item 7). The disconnectors have an earthing point to connect the grounding
connection (item 8).
Figure 4 Outdoor disconnector type ONIIIS-24/800 (24 kV,800 A)
8
2
1
4
7
5
4
3
6
