received by the International Bureau on 15 August 2018 (15.08.2018)

CLAIMS

1. Spring energy accumulator for a power diverter switch of an on-load tap changer, containing a carrying flange (1), on which a charging system and a switching system are mounted, the charging system being equipped with switching springs (12), a locking mechanism and unlocking means, wherein a pivot is mounted on the carrying flange (1), a charging lever (18) is mounted on said pivot, an upper rolling-contact bearing (16) is connected to the end of the charging lever (18) and a lower rolling-contact bearing (17) is connected to one end of a switching lever (20), wherein the other end of said switching lever (20) has a portion which is held in the two extreme positions by two locking pawls (22, 23), the said switching springs (12) are mounted between two levers, and wherein the charging system comprises a gear wheel (27) and a rod (26) connected to said gear wheel and to the charging lever (18) , characterized in that three pivots (2, 3, 4) are mounted on the carrying flange (1), wherein two levers (7, 9) are mounted in two of the pivots, wherein a hub (6) of the first lever (7) is mounted on the first pivot (2), a hub (8) of the second lever (9) is mounted on the second pivot (3), the two levers (7, 9) have widened front parts (14, 15), wherein the rolling-contact bearing (16) of the charging lever (18) is located between said widened front parts (14, 15) and wherein the switching springs (12) are mounted between the ends (10, 11) of the two levers (7, 9).

2. Spring energy accumulator according to claim 1, characterized in that in its upper part, the three pivots (2, 3, 4) are reinforced with a triangular plate (5).

3. Spring energy accumulator according to claims 1 and 2, characterized in that the locking system comprises a left locking pawl (22) and a right locking pawl (23) connected to a spring (24) and supported in the lower part on pivot (4), under the bearing of the charging lever (18), and pawls (25) mounted on the charging lever (18) are used for unlocking at the start of switching.

4. Spring energy accumulator according to claims 1, 2 and 3, characterized in that the shaft (28) of gear wheel (27) is mounted in a bush (29), mounted on the carrying flange (1).

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5. Spring energy accumulator according to claims 1, 2, 3 and 4, characterized in that with the aim of attaining greater force at the start of switching it is also possible to use an additional spring (13) connected between the ends (10, 11) of the two levers (7, 9), moreover this spring has a piston (44) with an axel (43), and the piston (46) may perform an idle stroke (x) until it begins to stretch the spring (13).

6. Spring energy accumulator according to claims 1, 2, 3, 4 and 5, characterized in that the shaft (20) of the double-armed lever (19) is connected to shaft (32) coupled to a contact system.

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