Cooper VariSTAR AZE Installation And Maintenance Instructions Manual

Surge Arresters
VariSTAR Type AZE Station Class Surge Arresters
®
Installation and Maintenance Instructions
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
GENERAL APPLICATION RECOMMENDATIONS . . .1
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Base or Foundation Mounting . . . . . . . . . . . . . . . .2
Bracket or Structure Mounting . . . . . . . . . . . . . . .2
Suspension Mounting . . . . . . . . . . . . . . . . . . . . . . .2
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . .2
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
CAUTION: The Cooper Power Systems
!
VariSTAR Type AZE surge arrester is
designed to be operated in accordance with safe
operating procedures. These instructions are not
intended to supersede or replace proper safety and
operating procedures. Read all instructions before
installing the arrester.
Surge arresters should be installed and serviced only
by personnel familiar with good safety practice and
the handling of high-voltage electrical equipment.
GENERAL
VariSTAR AZE station class surge arresters incorporate
the latest in metal oxide varistor (MOV) technology.
These arresters are totally gapless and are constructed
of a single series column of MOV disks. The arrester is
designed and tested to the requirements of standard
ANSI/IEEE C62.11 and is available in ratings suitable for
the overvoltage protection of high-voltage systems
through 345 kV.
GENERAL APPLICATION
RECOMMENDATIONS
Cooper Power Systems application engineers are
available to make specific application recommendations.
INSPECTION
The factory takes special precautions to ship arresters
in well designed containers that reduce the possibility of
damage which may occur during transit. Carefully
inspect the porcelain for chips or cracks. In case of
improper handling or shipping damage, immediately file
a claim with the carrier, and promptly notify Cooper
Power Systems or your local representative.
These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to pr ovide
directions for meeting every contingency during installation, operation, or maintenance. When additional information is desired to
satisfy a problem not covered sufficiently for the user's purpose, please contact your Cooper Power Systems sales engineer.
August 1997 • New Issue • © 1997 Cooper Power Systems, Inc.
Printed in U.S.A.
CAUTION: Do not install arresters that have
!
evidence of damage.
IDENTIFICATION
A nameplate attached to the base casting of each
VariSTAR arrester indicates its catalog number, voltage
rating, maximum continuous operating voltage (MCOV),
rated frequency, pressure-relief current rating, class,
reference to the type test standard, altitude range, serial
number, and year of manufacture.
For multiple unit arresters, a nameplate attached to
the top casting of each unit indicates the catalog number
and serial number of the complete arrester of which the
unit forms a part. The unit nameplate also indicates the
total number of units comprising the complete arrester
and references the position of this unit in the complete
assembly.
CAUTION: Always handle surge arresters
!
carefully. Dropping or jarring an arrester may
cause serious damage to the porcelain and/or
internal parts and may cause catastrophic failure
upon energization.
ASSEMBLY
VariSTAR Type AZE arresters rated 3 through 120 kV
are shipped ready for installation. The 132 through 360 kV
standard arresters require the assembly of multiple units
stacked in series. A grading ring is supplied for arresters
rated 172 through 360 kV. Some lower voltage ratings
having extra creepage housings may require multi-units
stacked in series and grading rings. Grading ring
assembly instructions are shown in Figure 6.
Choose a permanent location so that the arresters will
be installed as close as possible (electrically) to the
equipment being protected. Minimum clearance distances
between any line potential surface to an arrester and to
any ground plane are listed in Tables 2 and 3. Figures 1
and 2 show minimum phase-to-ground and minimum
phase-to-phase clearances. See Tables 2 and 3 and
Figures 7 and 8 for standard arrester dimension and
weight information.
CAUTION: The values shown in Tables 2 and
!
3 are the minimum clearances recommended
by Cooper Power Systems. These minimum clear-
ances may be increased to meet local or system
requirements for spacing of energized equipment.
Safe operating practices must always be followed.
Cooper Power Systems
Service Information
S235-87-1
1