9
ABB
IB 6.2.15.7-1C
M
ECHANISM
AND
O
PERATION
(Refer to Fig. 2A And 2B)
The ADVAC™ medium voltage circuit breaker uses a spring for stored energy. The Closing Spring (11) is a toroidal
spring. This spring supplies the energy necessary to close the breaker and assists with the opening. During the
closing operation, Opening Springs (6) (compression type) are charged along with Contact Springs (4) (also
compression type) in the pole assembly. During the opening operation, the Contact Springs and Opening Springs
supply the driving force to open the interrupter contacts.
D
ESCRIPTION
of
M
ECHANISM
O
PERATION
:
(Refer to Fig. 2A And 2B)
1. Manual or electrical charging rotates the Closing Spring (11) 360
°
to charge
a. Motor Limit Switch (17) changes state and removes control power from the motor
b. Closing Spring Charged/Discharged Indicator (28) changes to show CHARGED
c. Close Trigger (20) is set against Half Shaft (19b)
2. Manual or electric close rotates Half Shaft to release Close Trigger
a. Close Trigger releases Stop Disk (9) through a series of linkages
b. The Closing Spring (11) rotates Main Shaft (12) 270
°
c. The Cams (8) fixed on Main Shaft actuate Rocker Arms (7) for each pole
•
Rocker Arms compress Opening Springs (6)
•
Rocker Arms drive interrupter Push Rods (5)
•
Push Rods close Moving Contact in the Vacuum Interrupter (3)
•
Push Rods charge Contact Springs (4)
d. Main Shaft actuates Auxiliary Shaft (15) changing Auxiliary Contacts (16)
•
52a contacts close
•
52b contacts open
3. Manual or electric opening rotates other half shaft (19a) to release Open Trigger (21)
a. Open Trigger releases Stop Disk through a series of linkages
b. Opening Springs, Contact Springs and Closing Spring discharge, rotating the Main Shaft 90
°
(discharging the
360
°
charge on the Closing Spring)
c. Contact Springs discharge driving Push Rod to begin opening the Vacuum Interrupter Contacts
d. Opening Springs discharge driving the Rocker Arms to fully open the Vacuum Interrupter Contacts
e. Closing Spring discharges, rotating the Cams 90
°
f. Main Shaft actuates Auxiliary Shaft changing Auxiliary Contacts
•
52a contacts open ; 52b contacts close
MECHANISM AND OPERATION
