Interrupter/Operator Description
Closing Mode (Figure 14) -
Energizing the close solenoid
(265) pulls the solenoid armature against the closing shaft
actuator (75) and causes the close shaft (72) to rotate ap-
proximately 15
°
. If the closing springs are charged, the
close hatchet (22) will be released by this rotation allowing
the main cam shaft (3) to be driven by the closing springs.
Depressing the manual close button on the operator panel
causes the rotation of the close shaft (72) by the upper end
of the close shaft actuator (75). Rotation of the main cam
shaft (3) in a manual closing operation is identical to that
of the electrical closing operation. As the main cam shaft
(3) rotates, the cam follower (115) is driven by drive cam
(20) and the main link (120) is forced outwards, and rota-
tion of the jack shaft assembly (217) occurs. There are three
drive links attached to Point “A” of each of the three jack
shaft drive plates. Each drive link is connected to the mov-
able contact of one vacuum interrupter. Closing rotation
(counterclockwise) of the jack shaft assembly closes the
contacts of the three vacuum interrupters. During the clos-
ing operation, rotation of jack shaft assembly (217) forces
the opening (i.e., tripping) spring into its charged position.
Trip Free Mode - If at any time during breaker closing, the
trip shaft (79) (Figure 11) operates as a result of either an
electrical or mechanical trip, the trip hatchet (99) is free to
rotate. When the trip hatchet (99) rotates, cam follower
(115) is displaced by the drive cam (20) without motion of
the jack shaft (217).
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 energiz-
ing the trip solenoid (266) (Figure 12), or manually by press-
ing the trip button. Energizing the trip solenoid causes the
lower arm of the trip actuator (152) to rotate counterclock-
wise. Pressing the trip button causes the trip actuator up-
per arm to move, again producing rotation of the trip shaft.
All of the linkages are trip free, and tripping or opening is
unaffected by charging status of the closing springs or
position of the drive cam (20).
Rapid Auto-Reclosing Mode - The closing springs are au-
tomatically recharged by the motor driven operating
mechanism immediately following a closing operation. The
operating mechanism is capable of the open-close-open
duty cycle required for rapid auto reclosing. A trip latch
check switch prevents release of the closing spring energy
if the trip hatchet (99) is not in its reset position. This en-
sures the mechanism does not operate trip free on an in-
stantaneous reclosure. The user must supply external time
delay to assure minimum reclose time interval of 0.3 sec-
onds to comply with ANSI C37.06-2000.
Closing And Tripping Springs - The stored energy assem-
bly includes dual closing springs and a single opening
spring. Figure 15 shows the three springs and their link-
ages to the charging devices. The two closing springs are
11
Lower
Pawl
24-2
Pawl
Plate
Manual
Charging
Link
48
Ratchet
Wheel
15
Drive
Arm
8
Upper
Pawl
24-1
Drive
Plate
13
Manual
Charge
Handle
Socket
52
Close
Shaft
72
Main
Camshaft
3
Ratchet
Pin
16
Charging
Motor
Eccentric
100
Figure 13. Pawl and Ratchet Drive.
Figure 14. Closing Mode.
15
