INSTALLATION and OPERATION INSTRUCTIONS
CHANCE DUOGAP
®
INTERRUPTERS
P801-3498
©
Copyright 1993 A.B. Chance Company • 210 North Allen Street • Centralia, Missouri 65240 • Printed in USA
COUNTERCLOCK-
WISE TO REMOVE
CLOCKWISE TO
INSTALL
INTERRUPTER
RETAINING BOLT
CONTACT TERMINAL
SOCKET CASTING
DUOGAP
INTERRUPTER
HOT STICK RING
PUSH
PULL
15 - 27 kV
Counterclockwise Shown
(Clockwise Opposite Hand)
Step 3.
To install:
(1) Loosen the interrupter retaining bolt.
(2) Align the interrupter stud with the socket slot,
push the interrupter into the socket, and apply a
slight clockwise force. The stud will follow the slot
clockwise in the socket until the interrupter is
seated in its operating position. Pull back slightly
to insure proper seating.
(3) Tighten the retaining bolt just snug — do not
overtighten and cause damage to the interrupter.
DESCRIPTION
A.B. Chance Duogap
®
Interrupters convert Chance Type
D6, D7 switches to 600 amp loadbreak switches. Two
units are available: 7.8 - 27kV and 38kV.
Catalog No.
C801-0520-P
C801-0532-P
DUOGAP
®
Interrupter
7.8kV thru 27kV - 600 Amp
38kV - 600 Amp
REMOVAL/INSTALLATION INSTRUCTIONS
Step 1.
The Duogap interrupter can be removed or installed
with a hotstick. However if removal or installation is
going to be done manually the switch must be removed
from service. Follow your utility's safety procedures.
Step 2.
To remove:
(1) Loosen the interrupter retaining bolt.
(2) Rotate the interrupter counterclockwise while push-
ing inward.
(3) Pull the interrupter out of the socket casting.
NOTE: Operating the Duogap manually by hand can cause damage to the internal mechanism if the operating lever is pulled
past point of contact release. Pull lever to point of full loading just prior to tripping, let it trip and then release immediately.
5
7
/
8
15-27kV
8
3
/
8
38kV
NOTE: Because Chance has a policy of continuous product improvement, it reserves the right to change design and specifications without notice.
Removal, installation and operation of A.B. Chance DUOGAP
®
interrupters must be done by properly trained and qualified personnel.
Failure to follow these instructions could result in damage to equipment or personnel.
▲▲
Step 4.
Measure (according to dimension shown for the appro-
priate kV rating) and mark the Duogap operating lever.
This mark will be used to make final adjustments for
proper operation.
These instructions do not claim to cover all details or variations
in equipment, nor to provide for all possible conditions to be met
with concerning installation, operation, or maintenance of this
equipment. If further information is desired or if particular prob-
lems are encountered which are not sufficiently covered in this
guide, contact A.B. Chance Company.
STEP 4
! CAUTION
®
®
POWER SYSTEMS, INC.
P801-3498 2
OPERATION
Shown is the switch blade actuating the interrupter for a counterclockwise opening switch. Clockwise operation is
opposite hand.
(1) With the switch blade in the closed position, the
current flow is through the blade, main contacts and
the contact terminal. The Duogap
®
is not in the
current path.
(2) As the blade begins to open out of the main contacts,
the current flow is through the blade, arc bolt,
arcing horn and contact terminal for a short time.
The Duogap
®
is still not in the current path at this
time.
DUOGAP
INTERRUPTER
CONTACT TERMINAL
AND SOCKET CASTING
MAIN CONTACTS
BLADE
ARC BOLT
ARCING HORN
CONTACT TERMINAL
AND SOCKET CASTING
DUOGAP
INTERRUPTER
BLADE
MAIN
CONTACTS
1
2
3
(3) As the blade continues opening and the Duogap
®
operating lever, current flow is divided momen-
tarily into two current paths:
(A) Blade, arc bolt, arcing horn and contact
terminal.
(B) Blade, blade tip, interrupter and contact
terminal.
As the blade continues, path (A) is lost and path
(B) only remains.
CONTACT TERMINAL
AND SOCKET CASTING
DUOGAP
INTERRUPTER
OPERATING
LEVER
BLADE TIP
BLADE
ARCING HORN
MAIN
CONTACTS
ARC BOLT
3 P801-3498
4
(4) Current flow continues through blade, blade tip,
operating lever, interrupter and contact terminal.
When air-gap is adequate to prevent arc re-strike
between blade and arcing horn, the interrupter
trips and breaks load internally. (SEE NOTE 1.)
Loadbreak occurs when the two contacts, parting
simultaneously, split the circuit allowing a double
break in the circuit. The heat of the arcs cause
gases to generate from the delrin sleeve and liner
which expels and cools the arc. The gas pressure
is then vented through the weather/insect shield.
DUOGAP
INTERRUPTER
ARCING HORN
5
(5) The blade tip separates from the interrupter
operating lever after the interruption, resetting
the interrupter for the next operation.
During closing, the switch blade arc bolt picks up
the arcing horn before the blade tip brushes past
the operating lever of the interrupter, thus only
limited current is through the interrupter.
NOTE 1.:
When blade tip intersects with mark on
lever the tripping mechanism has
reached its full free travel just prior to
tripping. If tripping occurs other than
described, adjustments are required.
Loosen arc bolt and move blade end in
or out. Retorque arc bolt to 25 ft.-lb.
OPERATING
LEVER
BLADE TIP
AIR GAP
WEATHER/
INSECT SHIELD
INTERRUPTER TRIP POSITION
CONTACT TERMINAL
AND SOCKET CASTING
BLADE END
ARC
CHAMBER
OPERATING
LEVER
BLADE TIP
ARC BOLT
BLADE
ARCING HORN
CONTACT TERMINAL
AND SOCKET CASTING
CLOSING
ARC BOLT
DUOGAP
INTERRUPTER
-
1
-
2
-
3
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