Electro Composites SDC User Manual

General information on handling

and maintenance of

Capacitor Bushings

SDCTM Solid Dielectric

Electro Composites (2008) ULC
Tel: [phone]
Web site: http://www.hubbellpowersystems.com/about/ec/

Revision 3 February 21, 2012

Foreword

This guide is intended to address issues strictly relating to ELECTRO COMPOSITES
(2008) ULC cycloaliphatic epoxy resin, dry type bushings for use on transformers, circuit
breakers and reclosers. Issues relating to any other ELECTRO COMPOSITES (2008)
ULC product should be addressed with ELECTRO COMPOSITES (2008) ULC Technical
staff.

These guidelines are presented as suggestions only and are not intended to reflect the
specific conditions of our product's usage on your equipment. As such, we recommend
that you use this information carefully and take the necessary steps to ensure that it
accommodates your particular application and operating conditions. The reader is
requested to address any questions or concerns directly with ELECTRO COMPOSITES
(2008) ULC technical staff for further information and instructions on proper installation,
use and maintenance of our bushings.

ELECTRO COMPOSITES (2008) ULC makes no warranty, representations, whether
express or implied, or representation and assumes no liability for the accuracy of the
information in this document or the use of such information. All information contained in
this guide is subject to change without prior notice. PLEASE REFER TO THE
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY at the end of this
document.

Page 2 of 12

This guide is intended to provide the user with information concerning the handling and
maintenance of ELECTRO COMPOSITES (2008) ULC polymeric bushings, from the
time the bushings are received until they are put into service, as well as general
maintenance guidelines after specific in-service periods. All possible contingencies,
which may arise during installation, operation, or maintenance, and all details and
variations of this equipment, are not purported to be covered in this guide. For any
questions that may arise and not covered by this guide, the reader is recommended to
contact ELECTRO COMPOSITES (2008) ULC for assistance.

GENERAL BUSHING INFORMATION

ELECTRO COMPOSITES (2008) ULC Dry Type bushings are designed for use on
transformers and oil circuit breaker applications, up to 170 kV voltage class and 5000A
current rating. Bushings can be designed to conform to the following bushing standards:



IEC 60137: Insulated Bushings for Alternating Voltages Above 1000V



ANSI/IEEE C57.19.01: Standard Performance Characteristics and
Dimensions for Outdoor Apparatus Bushings



ANSI/IEEE C57.19.00: Standard General Requirements and Test Procedure
for Outdoor Power Apparatus Bushings



CAN/CSA C88.1: Power Transformer and Reactor Bushings

(Please refer to the bushing drawing for the applicable standard)

ELECTRO COMPOSITES (2008) ULC bushings
consist of a central electrolytic copper conductor,
either solid core or draw-lead type, encapsulated in
a monolithic solid rigid cycloaliphatic epoxy resin
dielectric body. External sheds are integral to the
epoxy core eliminating all interfaces through the
insulting core. A high strength aluminum flange is
bonded to the epoxy body and allows for mounting.
All working surfaces are precision machined for
optimal fit. The flange is designed to insure
maximum seal – with no leakage permitted between
the flange and the epoxy body. A non-foil
condenser shield (or series) is cast into the resin
along with the conductor, providing necessary E­Field grading and distribution. In the case of oil
circuit breaker type bushings, the condenser shield
is permanently connected to the metallic flange via
a setscrew insuring shield grounding. In the case of
transformer type bushings, a capacitance tap
connection is supplied. The outermost shield is
accessible through a threaded pin, insulated from
the flange when the capacitance tap button is
removed, allowing for capacitance and power factor
measurements.

THREADED HOLE

FOR EYE BOLT

TOP TERMINAL

CONDENSER SHIELD

CAPACITANCE TAP

CENTRAL CONDUCTOR

CROWN CAP

DIELECTRIC
EPOXY BODY

HIGH STRENGTH
MOUNTING FLANGE

BOTTOM TERMINAL

Page 3 of 12

There is no oil or other fluids or gases used in the
construction of ELECTRO COMPOSITES (2008) ULC
bushings.

AT ALL TIMES VERIFY THAT THE BUSHING IS
PROPERLY GROUNDED AND THAT THE
CAPACITANCE TAP SPRING AND CONTACT
WASHER ARE IN PLACE WHEN THE TAP COVER
IS CLOSED, OTHERWISE THE GROUNDING
SHIELD WILL NOT BE GROUNDED AND BUSHING
FAILURE WILL OCCUR.
After installation of the bushing on the equipment,
before the bushing is energized, proper steps must be
taken to insure the bushing is grounded. Verification
of the ground contact can be done by measuring the
resistance between the bushing flange and the
equipment on which the bushing is installed using an
ohm-meter. A maximum value of 0.5 ohm should be
measured under dry condition. If the measured value
is greater than the limit indicated, check the bushing
installation and verify the resistance again, or provide
other means to ground the bushing to the equipment.
ELECTRO COMPOSITES (2008) ULC bushings are
not supplied with a potential or voltage tap. Never
exceed 1000V when testing the bushings for
capacitance and power factor measurements.
However, test taps are insulated to 2000V.

This document does not purport to provide safe practices for use of equipment or the
performance of work around equipment where ELECTRO COMPOSITES (2008) ULC
bushings are installed. Installation and maintenance of ELECTRO COMPOSITES
(2008) ULC bushings is to be carried out by trained, certified and approved personnel
only. Although ELECTRO COMPOSITES (2008) ULC bushings present no danger to
personnel when not energized, reasonable care is to be taken when handling and
transporting bushings. Some edges may be sharp and bushings are bulky and heavy.

Page 4 of 12