indian standard 3637

7/27/2019 Indian Standard 3637

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I n d i a n St a n d a r d

SPECIFICATION FORGAS-OPERATED RELAYS

RelaysSectional Committee, ETDC 35

Chairmon

Smr K. M. CHINNAPPA

Members

Repmen 1 ng

Tata Hydro-Electric Power Supply Co Ltd, Bombay

SEBI G. K. THAKUB (Altmaafe toSbri K. M. Cbinnappa )

SHRI M. C. BASAVALIN~AIAH Mysore State Electricity Board, BangaloreSEBI S. K. BHITIA Heavy Electricals ( India ) Ltd, BhopalSARI V. S. BHATIA Siemens Engineering and Manufacturing Co of India

Ltd, BombaySHBI M. M. S~~EIWNA AlrcrnaLr

SHRI A. DUTTA J yoti Limited, BarodaSHB~ B. L. SINHVAL ( Alterno& )

SERI B. K. MUKHIRJ EE National Test House, CalcuttaSHRI R. PADMANABHAN The Tata Iron and Steel Co Ltd, Jamshedpur

SHRI A. G. DAUBE I Alfcmak )

’RBI S. G. PABAN~E

SIIBI M. S. RAJ A~OPALANSRBI N. NATH ( Altmafe )

Poor H. N. RAMACHANDBA RAO&RI V. SEETI~ABAMANSHBI P. K. SEN

SHBI C. S. SREENIVASANSRBI L. C. J AIN (Al&a& )

Sam N. T. TASKAB

SRBI IL S. VISWESWABIAHSHRI Y. S. V~NKATESWARAN,

Director ( Elcc tech )

Directorate General of Supplies & Disposals ( Inspec-tion Wing ) ( Ministry of Supply, TechnicalDevelopment & Material Planning )

The English Elictric Co of India Ltd, Madras

Indian Institute of Science, BangaloreRailway Board ( M:?istry of Railways)Punja’. State Electricity Board, Patiala

Central Water & Power Commission ( Power Wing )

Directorate General of Posts & Telegraphs ( Depart-ment of Communications )

Radio & Eleetricats Manufacturing Co Ltd, Bangalore

Director General, BIS ( E.x-o#io Mmbn )

smlar y

SHBI R. C. BAJ PAI

Assstant Director ( Elec tech ), BIS

Panel for Gas-Operated Relays, ETDC 35/P3

SRBI G. K. THAIK~B TataHydra-Electric Power Supply Co Ltd. Bombay



Indian Standard

SPECIFICATION FOR

GAS-OPERATED RELAYS

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institu-

tion on 13 June 1966, after the draft finalized by the Relays Sectional

Committee had been approved by the Electrotechnical Division Council.

0.2 This standard has been prepared to outline the requirements of

gas-operated relay ( also known as Buchholz relay ), which is widelyapplied for protecting oil immersed electrical apparatus fitted with

separate conservator vessel. The ability of the relay to detect variety of

faults inside an oil immersed electrical apparatus has made it a popular

protective device for such apparatus. Its simplicity in application and its

relative inexpensiveness are also factors commending it to wide use.

0.3 With increasing production and use of oil immersed electrical

apparatus in this country, the demand for this relay is on the increase.

This standard has been prepared to guide the indigenous producers and

the users of this relay as to its minimum requirements.

0.4 For the purpose of deciding whether a particular requirement of this

standard is comRlicd with, the final value, observed or calculated,

expressing the result of a test or analysis, shall be rounded off in

accordance with IS : Z-1960*. The number of significant places retained

in the rounded off value should be the same as that of the specified value

in this standard.

1. SCOPE

1.1 This standard covers requirements and methods of test for gas-operat-

ed relays intended for installation in the connecting passage ofoil between

the main tank of an oil immersed e’ectrical apparatus and its oil copserva-

tor vessel.

1.2 This standard covers gas-operated relays fitted with both alarm and

trip elements.

1.3Although this standard does not specifically exclude gas-operatec

rcIays intended only for alarm, special provisions intended only for sucl

relap have not been included.

*Kulcs for rounding off umerical values ( revised ).

2



xs:3637-1966

standard does not cover gas-operated relays which are not

to be installed in the oil passage between the main tank and the

It also ‘does not cover gas-operated relays used for the

of oil immersed apparatus mounted on railway vehicles.

the purpose of this standard, the following definitions shall apply.

NOTE - R&rence ir also invited to IS : 1885 ( Part IX )-1966*.

A device designed to produce sudden predetermined changes

one or more &sicuZ system(s) on the appearance of certain conditions

the phyticul system controlling it.

NOTE- In tlie case of gas-operated relay the cauw OFresponse ir considered in-directly electrical.

2.2 Gas-Operated Relay- A relay whose operation depends upon the

quantity and/or pressure of gas and/or velocity of tlow of liquid.

2.3 Energizing Qatity --The quantity which alone or in combination

with other quantities, must be applied to the relay to enable it to function

(for example, the voltage and current for all-or-nothing relay, the voltage

and current for a power relay and impedance relay, the voltage for a

frequency relay, the current for a bias current relay or gas or flow of

liquid for a gas-operated relay.

2.4 Operating Time -For a given operation and the relay in its initial

position, the time between the instant when a specified value ofenergizing

juantity able to operate the relay is suddenly applied and the instant

when the relay operates.

2.5 Make Contact (Normally Open Contact ) -A contact which is

open when the relay is de-energized.

2.6 Making Capacity-The maximum current and volt-amperes that

the contact is able to make successfully under specified conditions’without

significant damage to the contact.

2.7 Current Carrying Capacity -The maximum curGent which the

contact is able to carry continuously.

2.8 Alarm Device - A device which responds to accumulation of gas, in

the relay body and causes a switch to close for an external alarm circuit.

2.9 Trip Device - A device which responds to velocity of flow of oiltowards the free oil level in a protected apparatus and/or loss of oij in therelay body and causes a switch to close for an external trip circuit.

*Electrotcchnicnl vocabulary : Part IX Electrical relays.



.I5:3637-1966

2.10 Type Tests-Tests carried out to prove conformity with the requi-rements of this specification. These are intended to prove the generalquality and design of a given type of relay.

2.11 Routine Tests -Tests carried out on each relay to check require-

ments likely to vary during production.

3. RATING

3.1 The standard ratings of a relay shall be in accordance with Table 1.

TABLE 1 STANDARD RATINGS

NOMINAL IPEBORE

mm

25

50

80

ENERGIZINGUANTITYc----- ---_-~

Gas Volume for Steady Oil FlowAlarm at 5” Pitch for Trip at 1” to

Angle 9” Pipe Angle

cm3 cm jsec

90 to 165 70 to 130

175 to 225 75 to 140

200 to 3w 90 to 160

3.2 The relay shall operate satisfactorily in the following conditionsof oil:

Oil temperature 10” to 100°C

Oil viscosity 65 to 75 centistokes at 10°C2 to 3.5 centistokes at 100°C

3.3 The current rating of the switch shall be 2 amperes at 240 volts,50 Hz ac or dc. The resistance of this switch shall not exceed 0.1 ohm

and the cross-section ofbe less than 0.25 mm2.

4. CONSTRUCTION

4.1 The relay housing

mechanical defects and

service. No rain-waterseep into its interior.

current leads connected to it shall preferably not

shall be weather resistant, shall be free from

shall withstand pressures encountered in normal

shall be allowed to accumulate on the relay, or to

4.2 A surface on the top of housing shall be machined to facilitate mount-ing of relay at site to its correct orientation.

4.3 A substantial inspection window of tough transparent material shall

be fitted on each side of the relay housing ,thr<bugh which it is possible tosee the oil level. Viewed from the front, it shall be possible to ascertain

the volume of gas present in the relay in cubic centimetres on a calibrated

scale.4.4 A pet-cock complete with a screwed cap shall be provided on the topof the relay. A similar pet-cock may also be provided in a convenientposition to facilitate site testing of the trip device.



Is:363711966

4.5 The inner parts of the relay shall be built of material which will with-

stand effects of hot transformer oil and its disintegration products likely to

be encountered in service.

4.6 The design and mounting arrangements for the switches shall be such

that maloperation does not occur under normal. service conditions of theprotected apparatus on which the relay is mounted.

4.7 The connecting leads .from the switch shall be made of tinned copper

flexible wire insulated with ceramic beads or with braided silk or with

any other equivalent insulating material. They shall be terminated on

outlet bushings by means of compressed terminal lugs or by other similar

method. Soldered connection shall not be employed.

4.8 The outlet terminals shall be suitable for connection to external con-

ductors of size 1.5 to 4 mm2 and housed in a weather-proof air insulatedterminal chamber on the relay housing. A suitable conduit entry and

bottom drain hole in the chamber shall be provided.

4.9 A mechanical device capable of being operated from the exterior of

the relay to check the continuity of electrical circuits and lock the alarm

and,trip devices whilst the relay is in transit, may be provided.

4.10 The *dimensions of mounting flanges shall be in accordance with

IS: 3639-1966*. If threaded connections are used in the pipe, the relay

flanges and the pipes shall be threaded to sizes PI, P2 and P3 in accor-dance with IS : 554-19647 for relay sizes 25, 50 and 80 mm nominal pipe

bore respectively.

5. NORMAL SERVICE CONDITIONS

5.1 The relay shall be suitable for operation at the conditions at which

the apparatus on which it is mounted is expected to operate ( for mounting

on transformers see Appendix A of IS : 2026-1962t ).

6. MARKING

6.1 The following particulars shall be marked distinctly and permanently

on every relay in a position preferably visible from the front:

a) A reference to this standard, that is ‘Ref ISS 3637’;

b) Manufacturers’ name and/or trade-mark;

c) Country of manufacture; and

d) Manufacturers type reference and serial number.

-*Specification for fittings and accessories for power transformers.+Dimensions for pipe threads for gas list tubes and pressure tight screwed fittings

( revised ) .JSpecification for power translormers.



IS:3637-M6

6.1.1 ‘S’he direction of oil flow through the relay txxising operation ofthe relayhallbeinddildyarked by an arrow head which should beconspictmusly visible.

61+2he outlet terminalsf the alarm and trip devices shall beindelibly marked by Iettersand T in their proximity in the terminalenclosure.

6J 3 A gra dua t ed sca le to rea d the vohsmc in etsb~c centirnetres of gasaceurnssiated inside the relay shall be provided.

6.2 BE$ Certiflctstknt Mm-king

The pr od uct m a y r ds o b r nS rkedw it h S t a n da r d Ma r k.

6.2.1 The use of the S t a nda rd Ma rk is governed by the provisions of th

B trrea u of India n S t anda rds Ac$ 19S6 a nd the Rules a nd Regula tions ma d

t hereunder. The det a ils of cmdit iorrs under w hich t he licence for t he usc a

S ta nda rd Ma rk ma y be granted to mamskturem m pruducus may be obtsina

fr om t h e B u r ea u of Indian Standards.

7. TE S TS

7.1 Classification of Tests

7.1.1 Ty/w Tes[~ — The following shall comprise the type tesk

a) Porosity test ( 7.2),

b) High vol:agc and insulation resistance test ( 7.3),

c) EIcments test ( ?.4 ),

d) Gas VOtUrSM test (

7.5),e) Loss of oil and surge test ( 7.6 ),

f ) Sfcchariical st rengt h t est ( 7.7), a nd

g) %elocit y ca libr a tion t est ( 7.8}.

7.1.2 Rcwtinr Tf~ts —The following shali comprise the r@nc t est s a ndsh a }l be carried out on a)] days:

a) Porosity test ( 7.2 ),

b) High voltage and insulation resistance test (73),

c) Ekmenrs test ( 7.4),

d) Gas Vr)lu[ric test ( 7.5), and

e} Loss of oil a nd surge t est ( 7.6)

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indian standard 3637

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