Opening Mode; Rapid Auto-Preclosing Mode - Siemens SGIM-3268H Manual

Interrupter/Operator Description

Opening Mode

Opening or tripping the vacuum interrupter contacts is
accomplished by rotation of the trip shaft (79). Rotation
may be produced either electrically, by energizing the trip
solenoid (266) (Figure 15b), or manually by pressing the
trip button. Energizing the trip solenoid causes the upper
arm of the trip actuator (152) to rotate counterclockwise.
Pressing the trip button causes the trip actuator lower arm
to move, again producing rotation of the trip shaft. All of
the linkages are trip free, and tripping or opening is unaf-
fected by charging status of the closing springs or position
of the drive cam (20).
Rapid Auto-Reclosing Mode (Optional)
The closing springs are automatically recharged by the
motor driven operating mechanism when the circuit
breaker has closed. The operating mechanism is capable of
the open-close-open duty cycle required for rapid auto-
reclosing. A trip latch check switch and a relay (delay on
dropout) prevent release of the closing spring energy if the
trip hatchet (99) is not in its reset position. This ensures
the mechanism does not operate trip free on an instanta-
Figure 16b: Pawl and Ratchet Drive.
neous reclosure.
Mechanism – Mid-1991 and After Mechanism – Up to Mid-1991
( Viewed from Left Side)
( Viewed from Left Side)
(Refer to Pages 11-13)
(Refer to Pages 13-15)
Figure 17b: Closing Mode.
Figure 18: Identification of Mechanism Vintage.
15
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