IS 1885-54: Electrotechnical Vocabulary, Part 54: Insulators

12 Pages·1993·1.2 MB·English

by  Bureau of Indian Standards

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IS 1885-54 (1993): Electrotechnical Vocabulary, Part 54:
Insulators [ETD 1: Basic Electrotechnical Standards]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS 1886 ( Part 64 ) : 1993
IEC Pub 60 (471) ( 1984 )
oTrTa’fs Jwr~

Indian Standard
~~~E~TR~+TE~H~~G~L~~~Lu~~LARY
,
PART 54 INSULATORS
First Revision
( )
UDC 621.315-62 : 001.4

Q BIS 1993
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
May 1993 Price Group 3
Basic Electrotechnical Standards Sectional Committee, ET 01
NATIONAL FOREWORD
This Indian Standard ( Part 54 ) ( First Revision ) which is identical with IEC Pub 50 ( 471 ) ( 1984 )
‘International electrotechnical vocabulary - Chapter 471 : Insulators’, issued by the International
Electrotechnical Commission ( IEC ), was adopted by the Bureau of Indian Standards on the
recommendation of the Basic Electrotechnical Standards Sectional Committee, ET 01 and approval of
the Electrotechnical Division Council.
This Indian Standard ( Part 54 ) was first published in 1980. This first revision has been undertaken to
align it with the international practice.
Only the English text given in the IEC publication has been retained while adopting as Indian
Standard, and as such the page numbers given here are not same as in IEC publication.
IS 1885 ( Part 54) : 1993
IEC Pub 50 (471) (1984)
Indian Standard
ELECTROTECHNICALVOCABULARY
PART 54 INSULATORS
(First Revision)
SECTION 471-Ol- GENERALTERMS .
471-01-01 of the insulating parto f an insulator such parts are considered
to be effective insulating surfaces and the distance over them
insulator
is included in the creepage distance.
A device intended for electrical insulation. and
mechanical fixing of equipment or conductors which 471-01-09
are subject to potential differences. protected creepage distance
That part of the creepage distance on the illuminated
471-01-02
side of the insulator which would lie in shadow if light
fixing device were projected on to the insulator at 90” (or 45’ in
A device, forming part of an insulator, intended to special cases) to the longitudinal axis of the insulator.
connect it to a supporting structure, or to a conductor,
471-01-10
or to an item of equipment, or to another insulator.
spacing
Note- Where the fixing device is metallic, the term “metal
The distance between two consecutive points recurring
fitting” is normally used.
in repetitive positions on an insulator or insulator
471-01-03 assembly.
core of an insulator
471-M-11
The central insulating part of an insulator which puncture (of an insulator)
provides the mechanical characteristics and from
which the sheds project. A disruptive discharge pas,sing through the solid in-
sulating material of the insulator which produces a
471-01-04 permanent loss of dielectric strength.
shed of an insulator
471-01-12
Au insulating part, projecting from the insulator core, flashover (of an insulator)
intended to increase the creepage distance. The shed
A disruptive discharge external to the irbsulator, and
can be with or without ribs.
over its surface, connecting those parts which normally
471-01-0s have the operating voltage between them.
Id aze 471-01-13
A glassy surface layer on the insulating part of a solid-core insulator
ceramic insulator. An insulator of which the core is solid and composed

only ofhomogeneous insulating material.
471-01-06

semiconducting glaze 471-01-14
A glaze having a resistivity lower than that. of a usual multi-element insulator
ceramic material or glaze so that its surface resistivity An insulator which has an insulating body con$&
generally lies in the range of lo4 to lo7 Sz. of two or more disc or bell-shaped insulating elements
471-01-07 permanently assembled together and to the fixing
device(s).
arcing distance
The shortest distance in air external to the insulator Note -The term “multiple cone insulator” is included in this
definition.
between the metallic parts which normally have the
operating voltage between them. 471-01-1s
Note -The term “dry’arcing distance” is also used. antipollution-type bmWr
471-01-08 An insulatorwhich bas the emma1 pmfie desibed for
creepage distance use in polluted areas.
The shortest distance along the surface of an insulator .471*01-16
between two conductive parts. stabilized insulator
Note-The surface of cement or of any other non-insulating
&u insulator having the wholi surface of the insulating
jointing material is not considered as forming part of the’
parts covered wifh high resistance coating e.g. semi-
creepage distanti. If high resistance coating is applied to parts
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Is 1885 ( Part 54) : 1993
IEC Pub 50 (471) (1984)
conducting glaze. 471-01-19
Note - An insulator with high resistance coating or semi- camber of an insulator
conducting glaze applied to small areas of the insulating parts
The maximum distance between the theoretical axis of
to reduce local electrical stresses is sometimes called a “fringe
an insulator and the curved line being the locus of the
glazed insulator”.
centres of all the transverse cross-sections of the un-
471-01-17 loaded insulator.
hollow insulator
471-01-20
A hollow insulator which is open from end to end, with deflection under bending load
or without sheds.
The displacement of a point on an insulator, measured
Note --Ingeneral, theterm hollow insulatordoes notinclude
perpendicularly to its axis, under the effect of a load
the fixing devices or end fittings. A hollow insulator may
applied perpendicularly to this axis.
consist of one or two or more peimanently assembled insulat-
ing elements. 471-01-21
471-01-18 toughened glass
composite insulator Glass in which pre-stresses have been created in order
Insulator made of at least two insulating materials: the to improve its mechanical characteristics.
core and the external envelope. The composite insulator,
471-01-22
for example, can consist either of individual sheds
annealed glass
mounted on the core, with or without an intermediate
sheath or alternatively, of the complete envelope with A glass which has been treated to eliminate internal
sheds directly moulded or cast in one piece on to the core. stresses.
SECTION 471-02-TERMS CONCERNING BUSHINGS ,
471-02-01 471-02-04
bushing outdoor bushing
Adevice that enables one or several conductors to pass A bushing both ends of which are intended to be in
through a partition such as a wall or a tank, and insu- ambient air at atmospheric pressure and exposed to
lates the conductors from it. The means of attachment outdoor atmospheric conditions.
(flange or fixing device) to the partition forms part of
471-02-05
the bushing.
outdoor-indoor bushing
Notes:
A bushing both ends of which are intended to be in
I-The conductor may form an integral part of the bushing
ambient air at atmospheric pressure. One end is in-
or be drawn into the central tube of the bushing.
tended to be exposed and the other end not to be
2 -The bushings may be of the following types:
exposed to outdoor atmospheric conditions.
liquid filled bushing,
liquid insulated bushing; 471-02-06
gas filled bushing; indoor-immersed bushing
gas insulated bushing; Abushing one end ofwhich is intended to be inambient
oil impregnated paper bushing; air but not exposed to outdoor atmospheric conditions
resin bonded paper bushing; resin impregnated paper bush- and the dther end to be immersed in an insulating
ing; medium other than ambient air (e.g. oil or gas).
ceramic, glass or analogous inorganic material bushing;
471-02-07
cast insulation bushing;
outdoor-immersed bushing
composite bushing.’
Abushing one end ofwhich is intended to be in ambient
471-02-02 air and exposed to outdoor atmospheric conditions and
capacitance graded bushing the other end to be immersed in an insulating medium
other than ambient air (e.g. oil or gas).
A bushing in which a desired voltage grading is ob-
tained by an arrangement of conducting layers incor- 471-02-08
porated into the insulating material. completely immersed bushing
A bushing both end; of which are intended to be
471-02-03
immersed in insulating media other than ambient air
indoor bushing (e.g. oil or gas)
A bushing both ends of which are intended to be in 471-02-W
ambient air at atmospheric pressure but not exposed to draw lead bushihg
outdoor atmospheric.conditions. Abushing not having an integral current-carrying con-
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IS 1885 (Part 54) : 1993
IEC Pub 50 (471) (1984)
ductor; a cable or other conductor may be drawn it may subsequently be detached to allow the bushing
through the bushing and attached to it at one end so that to be withdrawn.
SECTION 471-03 - TERMS CONCERNING INSULATORS FOR OVERHEAD LINES
471-03-01 471-03-07
cap and pin insulator pin insulator
An insulator comprising an insulating part having the A rigid insulator consisting of an insulating component
form of a disk or bell, with or without ribs on its lower intended to be mounted rigidly on a supporting struc-
surface, and fixing devices consisting of an outside cap ture by means of a pin passing up inside the insulating
and an inside pin attached axially. component which consists of one or more pieces of
insulating material permanently connected together.
471-03-02
long rod insulator 471-03-08
An insulator comprising an insulating part having an line-post insulator
approximately cylindrical core, with or without sheds,
Arigid insulator consisting of one or more components
and external or internal fixing devices attached to each
of insulating material permanently assembled with a
end.
metal base and intended to be mounted rigidly on a
471-03-03 supporting structure.
string insulator unit 471-03-09
A cap and pin insulator or long rod insulator of which
shackle insulator
the fixing devices are suitable for flexible attachment
to other similar string insulator units or to connecting An insulator consisting of one component of insulating
accessories. material and intended to be secured to the structure by
means of a spindle passing through it.
471-03-04
471-03-10
insulator string
strain insulator
Two or more strihg insulator units coupled together and
intended to give flexible #support to overhead line An insulator placed in a structural support such as
conductors and stressed mainly in tension. a guy or span wire to isolate a portion of the
support or to prevent leakage current through the
471-03-05
support.
inSulator set
An assembly of one or more insulator strings suitably 471-03-H
connected together, complete with fixing and protec- ball and socket coupling
tive devices as required in service.
A coupling consisting of a ball, a socket and a locking
device, and providing flexibility.
471-03-06
rigid jnsulator 471-03-12
An insulator intended to give rigid support to an over- clevis and tongue coupling

head line conductor and to be stressed mainly by bend- A coupling consisting of a clevis, a tongue and a
ing and compressive loads. clevis-pin and providing limited flexibility.
SECTION 471-04 -TERMS CONCERNING INSULATORS FOR SUBSTATIONS
471-04-01 complete with fixing devices designed to facilitate
post insulator attachment to it.
An insulator intended to give rigid support to a live part 471-04.03
which is to be insulated from earth or fromanother live
outdoor post insulator
nart.
r-- -. A post insulator intended to be exposed to outdoor
Note - A post insulator may be an assembly of a number of
atmospheric conditions.
post insulator units.
471-04-02 471-04-04
post insulator unit indoor post insulator
A constituent part of a post insulator consisting of a A post insulator not intended to be exposed to outdoor
permanent assembly of one or more insulating parts atmospheric conditions.
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1s 1885 ( P8ti 54) : 1993
IEC Pub SO( 47s) (19lH)
471-w-05
pedestal post insulator
A post insulator having two metal pasts, a “cap”;p artly A post insulator of approximately cylindrical shape
embracing atrd iusuhrting=uqiponert t&d a ‘$etksbrl” cxmsisting of otle or tnore’insulating components with
cemented into a recess in the insul&zg component; the a metal fiiting attached to each end; the metal fitting
cap normally has tapped boles and the pedestala flange may consist of a cap, insert or flange with plain or
with plain boles for attachment by bolts or-screws. tapped boles for attachment by bolts or scnzws.
IS 1885 ( Part 54) : 1993
IEC Pub 50 (471) (1984)
INDEX
A insulator set 471-03-0s
insulator string 471-03-04
annealed glass 471-01-22
antipollution-type insulator 471-01-1s L
arcing distance 471-01-07
line-post insulator 471-03-08
B long rod insulator 471-03-02
ball and socket coupling 471-03-11 M
Gushing 471-02-01
multi-element insulator 471-01-14
C
0
capacitance graded bushing 471-02-02
outdoor bushing 471-02-04
camber of an insulator 471-01-19
outdoor-immersed bushing 471-02-07
cap and pin insulator 471-03-01
outdoor-indoor bushing 471-02-05
clevis and tongue coupling 471-03-12
outdoor post insulator 471-04-03
completely immersed bushing 471-02-08
composite insulator 471-01-B P
core of an insulator 471-01-03
creepage distance 471-01-08 pedestal post insulator 471-04-0s
cylindrical post insulator 471-04-06 pin insulator 471-03-07
post insulator 471-04-01
D post insulator unit 471-04-02
protected creepage distance 471-01-09
deflection under bending load 471-01-20
puncture (of an insulator) 471-01-11
draw lead bushing 471-02-09
F
rigid insulator 471-03-06
flashover (of an insulator) 471-01-12
fixing device 471-01-02
G semiconducting glaze 471-01-06
shackle insulator 471-03-09
glaze 471-01-0s
shed of an insulator 471-01-04
H solid-core insulator 471-01-13
hollow insulator 471-01-17 spacing 471-01-10
stabilized insulator 471-01-16
I strain insulator 471-03-10

indoor bushing 471-02-03 string insulator unit 471-03-03

indoor-immersed bushing ._ 471-02-06
indoor post insulator 471-04-04
insulator 471-01-01 ‘toughened glass 471-01-21
5