AB Amps Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405) Installation guide

Brand: AB Amps

Model: Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405)

Category: Audio amplifiers

Type: Installation guide

This manual is also suitable for

Bulletin No. 14-9405

Technical Note

Revised 4/99

TABLE OF CONTENTS PAGE

Description .................................................................2

Operation ...................................................................2

Application .................................................................4

Life Curves.................................................................4

Sales/Application Drawings .......................................5

Installation/Removal Instructions ...............................7

A.B. CHANCE COMPANY

OVERHEAD SWITCHGEAR TECHNICAL NOTE

DUOGAP® EXPULSION INTERRUPTERS

®®

POWER SYSTEMS, INC.

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.

DUOGAP® Interrupter

7.8kV thru 27kV - 600 Amp

38kV - 600 Amp

Catalog No.

C801-0520-P

C801-0532-P

-2-

(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.

(1) With the switch blade in the closed position,

the current flow is through the blade, main con-

tacts and the contact terminal. The Duogap® is not

in the current path.

OPERATION

Shown is the switch blade actuating the interrupter for a counterclockwise opening switch. Clockwise

operation is opposite hand.

-3-

(3) As the blade continues opening and the blade

tip touches the Duogap® operating lever, cur-

rent flow is divided momentarily into two cur-

rent 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.

(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.

Loadbreak occurs when the two contacts, part-

ing 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.

(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.

WEATHER/INSECT

SHIELD

DUOGAP® INTERRUPTER APPLICATION INFORMATION

LOAD

SWITCHING

600 Amps

MAGNETIZING3

CURRENT

7 Amps

.5 Amps

10 Amps

UNSHIELDED6

11 Amps

10 Amps

LINE CHARGING CABLE CHARGING GROUNDED

WYE

BANKS

100 Amps

50 Amps

40 Amps

INTERRUPTING LIFE CURVE

15 kV Duogap® Interrupter* INTERRUPTING LIFE CURVE

38 kV Duogap® Interrupter

*This life curve also applies to a 27 kV three-phase

system voltage when applied on solidly grounded wye

systems.

Typical line and station applications will normally involve

switching magnetizing current, line charging current,

parallel load current, moderate load current, plus occa-

sional switching of full load current at full voltage. Hence,

the average life expectancy of the Duogap® interrupter

may well exceed that depicted by the curves.

CAPACITOR SWITCHING 600 AMP

LOOP7

SWITCHING

4.8 kV

6.8 kV

UNGROUNDED

BANKS

N/A

SHIELDED5

100 Amps

10 Amps

UNGROUNDED

N/A

GROUNDED4

11 Amps

10 Amps

MAXIMUM

SYSTEM1

THREE-PHASE

VOLTAGE

15.5 kV

C801-0520-P

27 kV2

C801-0520-P

38 kV

C801-0532-P

-4-

APPLICATION NOTES:

1This chart applies to D6/D7 switches and Duogaps® manufactured by A. B. Chance Company for application on these

maximum system voltages.

2For application on three-phase solidly grounded systems with wye connected loads only.

3Maximum current available from test facility and does not necessarily represent a maximum value.

4Based on application to 4-wire grounded systems only and 1.2 times line-to-ground voltage —can be converted to miles

by: Miles =(160 Ic √3)/kV (L-L)

5Based on application to grounded systems only and line-to-ground voltage — can be converted to miles by: Miles =

Ic/[(Amps/1000 ft.) 5.28] where (Amps/1000 ft.) is a cable characteristic.

6Based on application to grounded systems only and 1.2 times line-to-ground voltage: Miles = Ic/[(Amps/1000 ft.) 5.28]

where (Amps/1000 ft.) is a cable characteristic.

7For applications where phase shift produces up to this rated loop switching voltage: No restriction on connections.

8Do not switch combinations of capacitor banks, unloaded lines or cables.

-5-

15 - 27 kV Duogap®

38 kV Duogap®

-6-

A.B. CHANCE COMPANY - Centralia, Missouri 65240 Bulletin No. 14-9405

Technical Note

Revised 4/99

INSTALLATION/REMOVAL INSTRUCTIONS

To remove:

(1) Loosen the interrupter retaining bolt.

(2) Rotate the interrupter counterclockwise while

pushing inward.

(3) Pull the interrupter out of the socket casting.

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.

(3) Tighten the retaining bolt just snug — do not

overtighten and cause damage to the inter-

rupter.

The interrupter can be hotstick-installed or removed from any phase of the D6 or D7 switch.

AB Amps Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405) Installation guide

Brand: AB Amps

Model: Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405)

AB Amps Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405) Installation guide

This manual is also suitable for

AB Amps Overhead Switchgear Technical Note: DUOGAP Expulsion Interrupters (14-9405) Installation guide

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