PUBLISHED DOCUMENT PD IEC61394:1997

Overhead lines Characteristics of greases for aluminium, aluminium alloy and steel bare conductors

ICS 29.050; 29.240.20

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

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PD IEC 61394:1997

This Published Document, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001

BSI 07-2001

ISBN 0 580 37209 X

National foreword

This Published Document reproduces verbatim IEC 61394:1997.

The UK participation in its preparation was entrusted to Technical Committee GEL/7, Wrought aluminium for electrical purposes, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary.

From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems.

Cross-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue.

aid enquirers to understand the text;

present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

monitor related international and European developments and promulgate them in the UK.

Summary of pages

This document comprises a front cover, an inside front cover, the IEC title page, pages 2 to 16, an inside back cover and a back cover.

The BSI copyright notice displayed in this document indicates when the document was last issued.

Amendments issued since publication

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RAPPORTTECHNIQUE

CEIIEC

TECHNICALREPORT

61394Premire dition

First edition1997-11

Lignes ariennes Caractristiques des produits de protectionpour conducteurs nus en aluminium,en alliage d'aluminium ou en acier

Overhead lines Characteristics of greases for aluminium,aluminium alloy and steel bare conductors

Numro de rfrenceReference number

CEI/IEC 61394:1997

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7991:CEI 49316 3

CONTENTS

Page

FOREWORD ................................................................................................................... 5

Clause

1 General ..................................................................................................................... 9

1.1 Scope .............................................................................................................. 9

1.2 Normative references ....................................................................................... 9

2 General requirements and classification .................................................................... 9

2.1 General requirements....................................................................................... 9

2.2 Classification of the product ............................................................................. 11

3 Approval and quality control....................................................................................... 11

3.1 Preconditioning of the samples......................................................................... 11

3.1.1 Products in the as-delivered condition .................................................. 11

3.1.2 Products taken from a conductor .......................................................... 13

3.2 Approval and quality test methods .................................................................... 13

3.2.1 Adherence test ..................................................................................... 13

3.2.2 Stability and ageing test ....................................................................... 13

3.2.3 Corrosion Test ..................................................................................... 15

3.2.4 Oil separation test ................................................................................ 17

3.3 Routine quality test methods ............................................................................ 19

3.3.1 Dropping point determination ................................................................ 19

3.3.2 Penetrability ......................................................................................... 19

3.3.3 Determination of acidity or alkalinity index ............................................ 21

4 Identification ............................................................................................................. 21

Table 1 Repeatability and reproducibility of results ........................................................ 19

Figures

1 Diagram showing coating of type I products ............................................................... 23

2 Plate for type II products ........................................................................................... 25

3 Notation of corrosion degree ..................................................................................... 25

4 Oil separation apparatus ........................................................................................... 27

Annexes

A Type test on complete conductor ............................................................................... 29

B Bibliography .............................................................................................................. 31

PD IEC 61394:1997

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gaPe

OFERWODR.............................................................................................................................. 3

lCsuae

1 Grenela................................................................................................................................ 51.1 Scepo.......................................................................................................................... 52.1 Nmroavite ferecnerse ................................................................................................. 5

2 Grenela ruqerimestne c dnalsasificaoitn ............................................................................. 51.2 Grenela ruqerimestne ................................................................................................. 52.2 Csalsificaitfo no htorp ecudt........................................................................................ 6

3 Aorppval adn auqilty colortn ................................................................................................ 61.3 Pcerdnotinoiing fo s ehtampsel................................................................................... 6

1.1.3 Prcudost t nisa eh-dlevirec deoidnoitn........................................................... 62.1.3 Prcudost takf nerom c acudnorot................................................................... 7

2.3 Arppoval adn auqilty test mesdoht ............................................................................. 71.2.3 Ahdcneret eest............................................................................................... 72.2.3 Sbatility adn egagni sett................................................................................. 73.2.3 CsorroiT noest ............................................................................................... 84.2.3 Os liepatarino sett.......................................................................................... 9

3.3 Rtuoauq eniilty sett mesdoht ...................................................................................... 011.3.3 Dpporop gnimreted tniiitan.........................................................................no 012.3.3 Pnebarteility ................................................................................................... 013.3.3 Dmreteioitanfo n caditiy a rolkailtiny dniex .................................................... 11

4 Itnedficiitaon ........................................................................................................................ 11

T 1 elba eRtaepbalitiy dna rrpeocudibitily fo results .............................................................. 01

Firugse1 Drgaima swohnic goatnifo g type I dorpcust ....................................................................... 212 Palf etot rype II dorpcust ....................................................................................................1 .33 Ntatonoi fo cosorrid noeerge ............................................................................................... 314 Os liepatarino ppasutara ..................................................................................................... 14

nnAexesA Tyep sett on compc eteloncudrot ........................................................................................ 51B Bbiilargophy......................................................................................................................... 61

BSI 0720012

Page

FOREWORD.............................................................................................................................. 3

Clause

1 General ................................................................................................................................ 51.1 Scope.......................................................................................................................... 51.2 Normative references ................................................................................................. 5

2 General requirements and classification ............................................................................. 52.1 General requirements ................................................................................................. 52.2 Classification of the product........................................................................................ 6

3 Approval and quality control ................................................................................................ 63.1 Preconditioning of the samples................................................................................... 6

3.1.1 Products in the as-delivered condition........................................................... 63.1.2 Products taken from a conductor................................................................... 7

3.2 Approval and quality test methods ............................................................................. 73.2.1 Adherence test............................................................................................... 73.2.2 Stability and ageing test................................................................................. 73.2.3 Corrosion test ................................................................................................ 83.2.4 Oil separation test.......................................................................................... 9

3.3 Routine quality test methods ...................................................................................... 103.3.1 Dropping point determination......................................................................... 103.3.2 Penetrability ................................................................................................... 103.3.3 Determination of acidity or alkalinity index .................................................... 11

4 Identification ........................................................................................................................ 11

Table 1 Repeatability and reproducibility of results .............................................................. 10

Figures1 Diagram showing coating of type I products ....................................................................... 122 Plate for type II products ..................................................................................................... 133 Notation of corrosion degree ............................................................................................... 134 Oil separation apparatus ..................................................................................................... 14

AnnexesA Type test on complete conductor ........................................................................................ 15B Bibliography......................................................................................................................... 16

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7991:CEI 49316 5

INTERNATIONAL ELECTROTECHNICAL COMMISSION_________

OVERHEAD LINES CHARACTERISTICS OF GREASES FOR ALUMINIUM,

ALUMINIUM ALLOY AND STEEL BARE CONDUCTORS

FOREWORD

1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.

3) The documents produced have the form of recommendations for international use and are published in the formof standards, technical reports or guides and they are accepted by the National Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. Inexceptional circumstances, a technical committee may propose the publication of a technicalreport of one of the following types:

type 1, when the required support cannot be obtained for the publication of anInternational Standard, despite repeated efforts;

type 2, when the subject is still under technical development or where for any otherreason there is the future but no immediate possibility of an agreement on an InternationalStandard;

type 3, when a technical committee has collected data of a different kind from thatwhich is normally published as an International Standard, for example "state of the art".

Technical reports of types 1 and 2 are subject to review within three years of publication todecide whether they can be transformed into International Standards. Technical reports oftype 3 do not necessarily have to be reviewed until the data they provide are considered to beno longer valid or useful.

PD IEC 61394:1997

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7991:CEI 49316 7

IEC 61394, which is a technical report of type 2, has been prepared by IEC technicalcommittee 7: Overhead electrical conductors.

The text of this technical report is based on the following documents:

Committee draft Report on voting

7/487/CDV 7/499/RVC

Full information on the voting for the approval of this Technical report can be found in thereport on voting indicated in the above table.

This document is issued in the Technical Report (type 2) series of publications (according toG.3.2.2 of part 1 of the IEC/ISO Directives) as a prospective standard for provisionalapplication in the field of overhead conductors because there is an urgent requirement forguidance on how standards in this field should be used to meet an identified need.

This document is not to be regarded as an International Standard. It is proposed forprovisional application so that information and experience of its use in practice may begathered. Comments on the content of this document should be sent to the IEC Central Office.

A review of this Technical Report (type 2) will be carried out not later than three years after itspublication, with the options of either extension for a further three years or conversion into toan International Standard or withdrawal.

Annexes A and B are for information only.

Figure 3, which is in colour, is to be found inserted in the inside of the back cover.

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7991:CEI 49316 9

OVERHEAD LINES CHARACTERISTICS OF GREASES FOR ALUMINIUM,

ALUMINIUM ALLOY AND STEEL BARE CONDUCTORS

1 General

1.1 Scope

This technical report applies to products designed for corrosion protection of bare electricaloverhead conductors in any combination of

wires of aluminium and aluminium alloy; wires of steel coated with zinc (galvanized) and zinc alloy with aluminium; wires of steel coated with aluminium.

1.2 Normative references

The following normative documents contain provisions which, through reference in this text,constitute provisions of this technical report. At the time of publication, the editions indicatedwere valid. All normative documents are subject to revision, and parties to agreements basedon this technical report are encouraged to investigate the possibility of applying the most recenteditions of the normative documents indicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.

IEC 60068-2-11:1981, Environmental testing Part 2: Tests Test Ka: Salt mist

lSO 2137:1985, Petroleum products Lubricating grease and petrolatum Determination ofcone penetration

ISO 2176:1995, Petroleum products Lubricating grease Determination of dropping point

ISO 3310-1:1990, Test sieves Technical requirements and testing Part 1: Test sieves ofmetal wire cloth

ISO 3310-2:1990, Test sieves Technical requirements and testing Part 2: Test sieves ofperforated metal plate

ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standardmeasurement method

2 General requirements and classification

2.1 General requirements

a) The product or any constituent element thereof shall neither be damaged, nor flow or exudefrom the conductor in the course of storage, transport, installation, placing in position or useat the maximum operating temperature or under normal short-circuit conditions (test underconsideration).

b) The product shall have good adherence to the wire. The adherence test (see 3.2.1) isintended to check this requirement.

c) The product shall not be damaged by the conductor manufacturing process. The stabilityand ageing test (see 3.2.2) and the oil separation test (see 3.2.4) are intended to check thisrequirement.

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7991:CEI 49316 11

d) The product shall retain its properties throughout the likely operating temperature range.The tests are the same as for requirement c).

e) The product shall protect the conductors against corrosion and shall neither corrode, noraffect the properties of the galvanized steel, aluminium-coated steel, aluminium oraluminium alloy wires or any combinations of those wires. The corrosion test (see 3.2.3) isintended to check this requirement.

f) The product shall not cause an increase in corona noise (test under consideration).

g) The product shall not present any risks to health and shall comply with all the usual healthand safety standards.

2.2 Classification of the product

The products covered by this technical report may be one of two types:

type I: products generally applied in the cold state, for example greases: semi-solid or solidproducts consisting essentially of a stabilized mixture of mineral or synthetic oil andthickeners such as metal soaps or inorganic compounds;

The manufacturer of the product shall advise if it is thixotropic or pseudo-plastic, in whichcase tests appropriate to that type of product shall be agreed upon by the supplier, theconductor manufacturer and the conductor user.

type II: products generally applied in the hot state, for example petrolatum: semi-solid, orsolid products made up essentially of microcrystalline waxes associated with smallquantities of mineral oil and organic additives.

3 Approval and quality control

To obtain approval of a product, the tests described in 3.2 shall be carried out. Whereappropriate, acceptable values shall be agreed between the product manufacturer, theconductor manufacturer and the conductor user.

If agreed between the product manufacturer, the conductor manufacturer and the conductoruser, a type test on a complete conductor may be carried out, as described in annex A.

In addition, the product manufacturer and the conductor manufacturer shall agree on theroutine tests that are necessary to ensure quality control of the product. Having been decidedupon, these tests shall be carried out as part of the approval procedures and, thereafter shallbe carried out on the conductor, where possible, or on samples taken from the point ofapplication during manufacture. The product manufacturer and the conductor manufacturershall agree on the degree to which a value may deviate from that obtained during the initialapproval test. Suitable test methods are described in 3.3.

The frequency of sampling shall be agreed between the conductor manufacturer and user.

3.1 Preconditioning of the samples

3.1.1 Products in the as-delivered condition

Prior to all tests, it is essential to precondition the products so that they are homogenised.

For type I products, after storage, excess oil may appear on the surface of the product. If so,this excess oil shall be removed. If necessary, the product shall be mixed prior to carrying outthe measurements. The quantities required for tests are taken and the measurements shall notbe carried out until after a rest period of at least 24 h.

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7991:CEI 49316 31

For type II products, the product is remelted at a temperature of 10 C to 20 C greater than thedropping point indicated by the manufacturer. The quantity necessary for carrying out the testsshall be poured in the liquid state and allowed to cool at ambient temperature for a period of atleast 24 h.

In order to achieve reproducibility for the two products, it is recommended to prepare samplesdirectly in the cups or vessels used for measurements.

3.1.2 Products taken from a conductor

When the test is carried out on products taken from a conductor, no preconditioning ispermitted.

3.2 Approval and quality test methods

3.2.1 Adherence test

An aluminium panel measuring 100 mm 100 mm and having a thickness of (1,0 0,1) mmshall be coated with a (0,50 0,05) mm thick film of the product on one side and thenmaintained at 20 C for 1 h.

The panel shall then be immediately bent to 120 around a 25 mm diameter mandrel which hasbeen cooled at 20 C.

The product shall remain adhering to the plate with no evidence of cracking or flaking whenexamined by the naked eye or with normal corrective lenses.

3.2.2 Stability and ageing test

In order to determine the penetrability, acidity or alkalinity of the grease, samples are placedin the vessels specified in ISO 2137 and, in order to check the corrosion, on assembliescomprising plates coated with the product. After this test, the plates undergo the corrosiontest.

Three electrogalvanized steel plates, 100 mm 100 mm 2 mm, with 3,75 m thickness ofzinc and a minimum of 2,8 m, shall be covered on one face with a protective coating whichwill withstand the ageing and saltspray tests.

For type I products, the metal plate is covered on each side with an adhesive tape of thickness(100 10) m. Slight excess of grease is spread uniformly over the whole surface and then theexcess is removed by sliding a perfectly flat and sharp metal rule over the two adhesive strips.Figure 1 illustrates the procedure.

For type II products, the metal plate suspended diagonally is immersed in a bath of grease. Toobtain the thickness of (100 10) m, the influence of parameters involved are determinedbeforehand these are duration of immersion, temperature of the bath, rate of removal fromthe bath, vertical dropping time, taking into account the following conditions.

The temperature of the bath shall be between (p + 10) C and (p + 30) C, where p is thedropping point measured in 3.3.1. The rate of removal from the bath shall be such that theplate is withdrawn in approximately 0,5 s. The vertical dropping time is the time during whichthe plate is kept vertical by the hole after removal from the bath. The excess material shall beremoved from the edges and the unused surface.

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7991:CEI 49316 51

The thickness is checked by the increase in mass of the plate.

P 104 E =

S

where

E is the thickness in micrometres;

P is the increase of mass in grams;

S is the area of the surface covered in square centimetres;

is the specific gravity of the product in grams per cubic centimetre at 20 C.

Then the cups and metal plates shall be subjected to three weekly cycles comprising thefollowing sequences of tests:

dry heat (relative humidity of less than 30 %) for 72 h at 70 C;

wet heat (relative humidity greater than 90 %) for 24 h at 55 C;

wet heat and cold for three 24 h sequences comprising the following:

0 h to 9 h: humid atmosphere at 55 C;

9 h to 11 h: holding in a cooled chamber at 20 C;

11 h to 14 h: humid atmosphere at 55 C;

14 h to 16 h: holding in a cooled chamber at 20 C;

16 h to 24 h: humid atmosphere at 55 C.

The temperatures shall be maintained with a tolerance of 2 C.

After this treatment, the grease in the cups shall be subjected without remelting, to thepenetrability tests at 60 C (see 3.3.2) and the acidity index or the alkalinity index (see 3.3.3) isdetermined.

The metal plates are then subjected to the corrosion test.

3.2.3 Corrosion test

The test is carried out on the metal plates which have undergone the stability and the ageingtest specified in 3.2.2. It consists of the following sequences:

seven cycles of 24 h in a sulphurous atmosphere saturated with moisture in the followingconditions: during the first 8 h, the metal plates are kept in a chamber saturated withmoisture and containing 0,067 % by volume of sulphur dioxide. The temperature is broughtto (40 3) C and kept at that level. During the last 16 h, the chamber door is opened to thelaboratory atmosphere;

168 h of exposure to salt mist (5 %) at a temperature of (35 1) C according to IEC 60068-2-11.

At the end of the test, the grease shall be removed by means of a suitable solvent and theplates shall be examined visually.

The plate with the highest degree of corrosion and the one with the lowest degree of corrosionin the central part (see figure 2) shall be discounted.

There shall only be a limited number of pits and a limited spread of corrosion from these pits inthe central part of the remaining plate.

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7991:CEI 49316 71

The degree of corrosion of this plate shall be assessed by means of a grading M based on thecorrosion plates shown in figure 3 used as a reference. The grade shall be greater than orequal to a number.

3.2.4 Oil separation test

This test gives useful information on the behaviour of the product during storage in cans ordrums by measuring the quantity of oil that separates from it under specific test conditions.

A cylindrical column of the product resting on a metal gauze cone is subjected to a givenpressure which is added to the hydrostatic pressure exerted by the product. The quantity of oilseparated by the gauze after maintaining the pressure for 42 h at 40 C is regarded as ameasure of the stability of the product against oil separation during storage and in use.

Apparatus

The separation measuring apparatus, shown in figure 4, comprises the following:

a) a separation cup, metal cylinder with a stainless steel gauze cone of mesh size 240complying with the requirements of ISO 3310-1 and ISO 3310-2, soldered at its base;

b) a metal weight of (100,0 0,1) g to increase the pressure;

c) an oil cup made of glass or metal of diameter and depth such that the apex of the gauzecone is at all times above the level of the oil collected in the cup.

NOTE A container 55 mm in diameter and 35 mm deep may be suitable.

Procedure

The following procedure is used.

a) Carry out three determinations.

b) Weigh the separation cup empty.

Fill the cup with the product sample, working it as little as possible and taking care toavoid the formation of any air pockets.

If possible, force a small quantity of the product through the gauze.

Smooth off the surface of the product with a spatula so that it is flush with the top of thecylinder and wipe off with the finger all the protection product that has passed throughthe gauze.

c) Weigh the oil cup empty to the nearest milligram.

Place the separation cup on the oil cup.

Adjust the 100 g weight at the top of the cylinder.

Place the whole apparatus in a chamber kept at (40 1) C for 42 h.

d) At the end of this test period, remove the oil cup and if there is a drop of oil hanging fromthe apex of the cone, add it to the oil in the cone; weigh the oil cup and all the oil in it to thenearest milligram.

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7991:CEI 49316 91

Expression of results

The calculations are made as follows.

a) Calculate the weight of the separated oil using the following equation:

Separated oil in % = 100 m/M

where

m is the mass of separated oil in milligrams;

M is the mass of the sample in milligrams.

b) Calculate the weighted mean of the three values to the nearest percent and give the meanvalue at 42 h as the quantity of oil separated.

Precision

The following criteria shall be used to assess acceptability of the results (with a confidencelevel of 95 %).

Repeatability and reproducibility are defined in ISO 5725-2.

a) Repeatability

The values of a second test series carried out by the same operator shall be regarded ashaving bad repeatability if they are different from the above values by more than r for theduration of the test considered (see table 1).

b) Reproducibility

The results of two different laboratories should not be regarded as suspect, unless the tworesults differ by more than R for the period indicated (see table 1).

NOTE The precision of these values was obtained from statistical examination of the results of interlaboratorytests first published in 1973.

Table 1 Repeatability and reproducibility of results

Temperature

C

Duration

h

r

%

R

%

40 42 0,7 1,6

3.3 Routine quality test methods

3.3.1 Dropping point determination

The method of determination is according to ISO 2176.

3.3.2 Penetrability

The method of determination is according to ISO 2137.

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7991:CEI 49316 12

3.3.3 Determination of acidity or alkalinity index

The determination shall be carried out using the simplified method described below.

Weigh approximately 1 g of the product into a conical flask and add 60 ml of toluene, 40 ml ofethyl alcohol and 1 ml of 6B CAS alkaline blue used as a colour indicator. Shake the mixturevigorously.

a) Acidity index

Add a decinormal potash solution of 96 % ethyl alcohol progressively to the mixturecontaining the product and shake the flask vigorously. Note the quantity of potash solutionused in millilitres until the colour indicator changes colour.

The acidity index is given by the formula:

Ia = 5,61nm

where

n is the quantity of decinormal potash solution required to neutralise the solution containingthe product, in millilitres;

5,61 is the titre of the potash solution in milligrams per millilitre;

m is the mass of the test portion of the product, in grams.

b) Alkalinity index

If the product is basic, acidify the solution containing the product with 5 ml of hydrochloricacid decinormal solution in 96 % ethyl alcohol and then neutralise it with n1 ml of the potashsolution as above.

The alkalinity index is given by the following formula:

Ib = 5,61(5 1 n

m

)

NOTE Calorimetry may be usefully replaced by a potentiometric method using a screened glass electrode and acalomel reference electrode containing a 96 % ethyl alcohol solution saturated with lithium chloride. Neutralisationis marked by reversal point or equivalent point of the curve of the changing potential as a function of the volume ofpotash added. If there are several acid functions, the curve has one equivalent point per function; the firstequivalent point is taken.

4 Identification

A sample of the product shall be subjected to analysis so that the product is uniquely identified.

If agreed between the purchaser and supplier, an identification report can be supplied.

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7991:CEI 49316 32

3

2

1

IEC 1 283/97

Key

1 Trapezoidal section rule

2 Adhesive tape

3 Plate

Figure 1 Diagram showing coating of type I products

PD IEC 61394:1997

100280 ISB 21 BSI 07200112

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7991:CEI 49316 52

1

IEC 1 284/97

Key

1 Zone for notation of degree of corrosion

Figure 2 Plate for type II products

Figure 3 Notation of corrosion degree(see inside of back cover)

PD IEC 61394:1997

100280 ISB 31 BSI 072001 13

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7991:CEI 49316 72

30

44

60

48

45

54

R = 25,4

3

2

1220,5

1

1

1

6

2

7

4

3

5

20 1

IEC 1 285/97

Dimensions in millimetres

Key

1 Total mass 100 g 5 Gauze cone

2 Rounded edges 6 Height adjusted as a function of the mass

3 Vent hole 7 Oil cup

4 Cone soldered to the body

NOTE Tolerance of all dimensions 0,25.

Figure 4 Oil separation apparatus

PD IEC 61394:1997

100280 ISB 41 BSI 07200114

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7991:CEI 49316 92

Annex A(informative)

Type test on complete conductor

A rheological test may be carried out on a sample conductor with a cross section area of atleast 400 mm2 and with a minimum of three layers containing the filling product up to andincluding the penultimate layer.

The sample conductor complying with IEC 61089 should be at least 5 m long and should beterminated with compression type tension clamps containing the same filling product as theconductor. The sample should be maintained at a tension of 20 kN at a slope of between 10and 15 to the horizontal and heated by the passage of current through its whole length.

The temperature of the conductor should be raised as follows:

a) to the maximum operating temperature minus 5 C in 1 h;

b) to the maximum operating temperature of the conductor plus 5 C in steps of 2 C every 5 min;

c) maintained at the maximum operating temperature plus 5 C for 1 h;

d) to the temperature where the product flows freely from the conductor or at least themaximum operating temperature plus 20 C.

The following temperatures should be noted:

a) the temperature at which the product first starts to move on the outside of the conductor;two adjacent wires of the outside layer approximately 1,5 m from the top end connectorshould be moved carefully to allow examination and then replaced;

b) the temperature at which the product fills any space between the wires of the outside layer.

c) the temperature at which the product drips from the conductor or the maximum operatingtemperature plus 20 C.

PD IEC 61394:1997

100280 ISB 51 BSI 072001 15

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7991:CEI 49316 13

Annex B(informative)

Bibliography

IEC 61089:1991, Round wire concentric by overhead electrical conductors

__________

PD IEC 61394:1997

100280 ISB 61 BSI 07200116

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PD IEC61394:1997

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