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IS 1885-81: Electrotechnical Vocabulary, Part 81: Electrical Measuring Instruments PDF

14 Pages·1993·1.3 MB·English
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Preview IS 1885-81: Electrotechnical Vocabulary, Part 81: Electrical Measuring Instruments

इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 1885-81 (1993): Electrotechnical Vocabulary, Part 81: Electrical Measuring Instruments [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””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 1885( Part81 ) :1993 IEC Pub50(302) ( 1983) WTGhfWm n flctwt!l Wqlcwit f~d m mrwm lndzan Standard ELECTROTECHNIC’ALVOCABULARY PART 81 ELECTRICAL MEASURING INSTRUMENTS (.JDC 621”317:001”4 @ BIS 1993 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 December 1993 ,, h-ice Group 4 Basic Electmtechnical Standards Sectional Committee, ET 01 CONTENTS Section Page CHAPTER 302: ELECTRICAL MEASURING INSTRUMENTS 302-01 General terms relating to the principle of operation . . . . . . . . . . . . . . . . . . . . . . . . 1 302-02 General terms relating to constructional or operational details . . . . . . . . . . . . . . . . . . 2 302-03 Detecting and indicating instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 302-04 Electric energy meters .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 302-05 Bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . 5 302-06 Constructional elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 302-07 Terms relating to technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 302-08 Terms relating to the performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 302-08 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 NATIONAL FOREWORD This Indian Standard (Part 81) which is identical with IEC Pub 50 (302) (1983) ‘International electrotechnical vocabulary-Chapter 302 : Electric al measuring instruments’, issued by the International Electrotechnical Commission (IEC), was adopted by the Bureau of Indian Standards on the recommendation of Basic Electrotechnical Standards Sectional Committee and approval of the Electrotechnical Division Council. Only the English text given in the IEC publication has been retained while adopting as ~dian Standard, and the page numbers given here are not the same as in IEC Publication. IS 1885 (Part XI): 1966 ElectrotechnicaI Vocabulary Part XI Electrical Measurements was based on IEC Pub 50 (20) (1958) International electrotechnical vocabulary :Group 20 Scientific and industrial measuring instmments. IEC 50 (20)(1958) has been revised and extended and has been brought out in one volume as IEC 50 (301, 302, 303), Chapter 301: General terms on measurements in electricity, Chapter 302: Electrical measuring instruments and Chapter 303: Electronic measuring instruments. IS 1885 (Part 81) is being brought as dual numbered standard of IEC 50 (302) and similarly IEC 50 (301) and 1~” 50 (303) are being dealt. When all the three parts of IS 1885 corresponding to IEC 50 (301, 302, 303) have been brought out, IS 1885 (Part XI) :1966 will stand withdrawn. 1S 1885 (Part 81): 1993 IEC Pub 50 (302) (1983) Indian Standard ELECTROTECHNICAL VOCABULARY PART 81 ELECTRICAL MEASURING INSTRUMENTS CHAPTER 302: ELECTRICAL MEASURING INSTRUMENTS SECTION 302-01—GENEML TERMS RELATING TO THE PRINCIPLE OF OPERATION 302-01-01 current in amovable coil with a current in one or more fixed coils and which incorporates soft ferromagnetic electrostatic instrument material in the magnetic circuit. An instrument intended to determine potential dif- 302-01-07 ference which operates by means of electrostatic forces between fixed and movable charged electrodes. induction instrument 302-01-02 An instrument which operates by the interaction of the alternating magnetic field(s) of (a) fixed electro-mag- permanent-magnet moving-coil instrument net(s) with the magnetic field(s) due to currents which they induce in (a) movable conductive element(s). An instrument which operates by the interaction of a current in a movable coil with the field of a fixed 302-01-08 permanent magnet. thermal instrument Note — llse movable partofthese instruments canhavemorethan electrothermal instrument (USA) one coil, measuring the sum or ratio of the currents in them. An instrument which operates by the heating effect of one or more currents. 302-01-03 302-01-09 moving-magnet instrument bimetallic instrument Au instrument which operates by the interaction of the field of a movable permanent magnet with a current in A thermal instrument in which the deformation of a a fixed coil. bimetallic element, heated directly or indirectly by a current produces the indication. Note. — The instrument can have more t h an one coil. 302-01-10 302-01-04 thermocouple instrument moving-iron instrument A thermal instrument inwhich the current heats one or An instrument comprising amovable pieee ofsoft mag- more thermocouples of which the electromotive netic material which is actuated either by acurrent in a force(s) is (are) measured. f~ed coil orby one (or more) fixed piece(s) ofsoft mag- 302-01-11 netic material, magnetized by acurrent inthe fixed coil. rectifier instrument 302-01-05 An instrument intended to measure alternating electrodynamics instrument quantities~ usually of the permanent-magnet An instrument which operates by the interaction ofacur- moving-coil type, in association with a rectifying rent in amovable coil with acurrent inone ormore fixed device. coils. 302-01-12 Note. — This term isgenerally reserved forinstruments which do vibrating reed instrument no!have ferromagnetic material inthemagnetic circuit, Au instrument intended tomeasure frequency, compris- 302-01-06 ing aset of tuned vibrating reeds, one or afew ofwhich ferrodynamic instrument resonate under the action ofanalternating current of the appropriate frequency flowing through one or more An instrument which operates by the interaction of a fixed coils. 1 IS 1885 (Part 81) :1993 IEC Pub 50 (302) (1983) SECTION 302-02-GENERAL TERMS RELATING TO CONSTRKJCTIONAL OPERATIONAL DETAILS 302-02-01 302-02-08 direct acting instrument strip chart recorder An instrument in which the indicating or recording A recording instrument in which the chart is a strip device is mechanically connected to, and actuated by, driven by the’chart driving mechanism. the moving element. 302-02-09 302-02-02 drum recorder indirect acting instrument A recording instrument in which the chart is wrapped as a single turn around a cylindrical dmm which is An instrument in which the indicating or recording rotated by the chart driving mechanism. device is driven by a motor or other device, controlled by the quantity to be measured and using 302-02-10 electromechanical, electrical or electronic means. disc recorder Note. — Indirect acting instruments maymake useofanymethod of comparison, but this is usually electrical or A recording instrument in which the chart is a disc mechanical. which isrotated by the chart driving mechanism. 302-02-03 302-02-11 pointer instrument pen recorder An indicating instrument inwhich the index-is apointer A recording instrument inwhich the record on the chart moving over a fixed scale. ismade by apen supplied with ink. 302-02-04 302-02-12 instrument with optical index stylus recorder An indicating instrument in which the indications are A recording instrument inwhich the record on the chart given by the displacetnent of an optical index over a is made by a styhts requiring no ink. scale which may be a part of the instrument or may be separate from it. 302-02-13 spot recorder 302-02-05 A recording instrument inwhich the record ismade by moving-sctile instrument aspot of light (visible or invisible) on a light-sensitive An indicating instrument in which the scale moves chart. relative to a fixed index. 302-02-14 Note.— An instrument ,ih which the scale is projected is a thetial recorder particular type ofmoving-scale instrument. A recording htstrumxtt in whicti the record ismade by 302-02-06 aheated stylus on aheat-sensitive chart. shadow column instrument 302-i12-15 An indicating, instiwinent in which the indications are j~t recorder given by a shadow coluinn on an illtnnmated sqle which may be a part of the instrument or may be A recording instrument in whicli the record is made by separate froln it. directing ajet of iiik on to the ctiart. 302-02-07 302-02-16 chart driving mechanism printing recorder A device for moving the chart in a way which is a A recording instrument inwhich the record ~Smade by function of avariable, generally time. asuccession of printed marks. 2 IS 1885 (Part 81) :1993 IEC Pub 50 (302) (1983) 302-02-17 302-02-21 continuous line recorder expanded scale instrument A recording instrument in which the record is a An instrtrment in which a small part of the measuring continuous line. range is expanded to occupy the greater portion of the scale length. 302-02-18 302-02-22 dotted line recorder A printing recorder in which the record comprises a astatic measuring instrument series of successive impressions which may be points} numerals, etc. Art instrument in which the measuring element is so constructed as to be unaffected by uniform magnetic 302-02-19 fields of external origin. event recorder 302-02-23 A recording instrument which records the presence or instrument with locking device absence of a quantity or the state of a two-state device as a function of time. An instrument in which a device can look the moving 302-02-20 element in the position where itstands at agiven time. instrumentwith suppressed zero 302-02-24 An instrument which gives no useful information when instrument with contacts the quantity to be measured is less than acertain value. Note.— “Suppressed zero” can apply to either mechanical zero An instrutnent in which the moving element operates or electrical zero (see 301-07-20 and 301-07-22). contracts at certain predetermined positions. SECTION 302-03-DETECTING AND INDICATING INSTRUMENTS 302-03-01 302-03-05 polarity indicator earth leakage detector A detecting instrument intended t o indicate the polarity An instrument intended to detect a leakage current to of one conductor with reference to a nother. earth. 302-03-02 302-03-06 phase sequence indicator live voltage detector An instrument intended to indicate, on a polyphase An instrument intended to show whether or not a system the sequence in which the instantaneous vol- conductive component islive. tages of the phase conductors reach their maximum values. 302-03-07 302-03-03 measuring spark gap synchronoscope A spark gap, generally between spheres, intended to measure peak voltage as a function of the flashover Art instrument intended to indicate if two a.c. voltages distance between the electrodes. orpolyphase voltages systems have the same frequency and are in phase. 302-03-08 302-03-04 electroscope insulation fault detecting instrument An electrostatic instrument intended to detect a potent- ial difference or an electric charge.. Au instrument intended to detect faults in electrical insulation. IS 1885 (Part 81) :1993 IEC Pub 50 (302) (1983) 302-03-09 quantity of electricity by reading the amplitude of the first swing of itsmoving element. quadrant electrometer 302-03-13 An electrometer in which the moving element-is ac- tuated by electrostatic forces between that element and string galvanometers fixed elements shaped like quadrants. 302-03-10 A galvanometers in which the moving element is a conductive thread which is stretched between the pole magnetic detector for lightning current pieces of apermanent magnet or of an electromagnet. magnetic link (deprecated in this sense) An instrument intended to detect alightning stroke and 302-03-14 togive an estimate of the value ofthe current due tothis lightning stroke by means of changes in the magnetic difference galvanometers characteristics of some of its components. differential galvanometers (deprecated) 302-03-11 A galvanometers intended to measure the difference of two currents. moving-coil galvanometers A galvanometers in which a coil carrying a current 302-03-15 moves in the field of apermanent magnet. vibration galvanometers 302-03-12 ballistic galvanometers A galvanometers in which the natural frequency of the moving element is adjusted to resonate with the fre- A galvanometers intended to measure the ~ahre of a quency of the current to be measured or detected. SECTION 302-04-ELECTRIC ENERGY METERS 302-04-01 302-04-05 mercury motor meter meter with maximum demand indicator An energy meter or a coulometer having a disc An energy meter fitted with a means to indicate the immersed inmercury and rotating inthe field produced by an electromagnet or a permanen~ m agnet. highest value of the power averaged over successive equal time intervals. 302-04-02 302-04-06 electrodynamics meter multi-rate meter An energy meter which operates by the rotation of the moving coils of an electrod ynamic measuring element. An energy meter provided with a number of registers, each becoming operative at specified time intervals 302-04-03 corresponding to different tariff& induction meter 302-04-07 An energy meter which operates by the rotation of the prepayment meter disc of an induction measuring element. 302-04-04 A device which is combination of an energy meter and a coin-freed mechanism which, by insertion of a excess energy meter suitable coin, connects asupply of electricity and, after the consumption ofapre-determined value of energy or An energy meter intended tomeasure the excess energy after a pre-determined time interval, disconnects the when the power exceeds a pre-determined value. supply. 4 IS 1885 (Part 81) :1993 [EC Pub 50 (302) (1983) SECTION 302-05—BRIDGES Preface.-Owing tothe great variety oftypes ofbridges Thomson (double) bridge which are often known by different names and differ only by details of their circuits, /he list of terms A six arm measuring bridge intended to measure the defined inthe present section islim]ted tosome basic value of a four-terminal resistor by comparison with a types only. four-terminal standard resistor, all of the arms being resistors, at least one of which is adjustable. 302-05-01 Whetstone bridge 302-05-03 A four arm measuring bridge intended to measure the transformer bridge value ofaresistor which forms one ofthe arms, the other three arms being resistors, at least one of which is Ana.c. measuring bridge intended tomeasure impedan- adjustable. ces, inwhich at least two arms consist of tapped wind- ings on a transformer, making use of the known ratios 302-05-02 of the turns and which can therefore have fixed value Kelvin (double) bridge standards. SECTION 302-06-CONSTRIJCTIONAL ELEMENTS 302-06-01 A circuit of a measuring instrument through which flows the current of the circuit to which the measuring measuring element (of an electromechanical instrument isconnected. measuring instrument) That part of a measuring instrument which transforms Note.— This current may beeither thecurrent directly invoked the quantity to be measured into a mechanical move- inthe measurement or aproportional current supplied by an external current tmnsformer or derived from an ment. external shunt. 302-06-02 302-06-05 moving element The moving part of a measuring element. voltage circuit (of ameasuring instrument) 302-06-03 A circuit of ameasuring instrument towhich isappli~d the vol~age of the circuit towhich the measuring instru- register (of an integrating instrument) ment is connected. The part of an integrating instrument which enables the measured value tobe determined. Note.— This voltage may beeither thevoltage directly involved inthe measurement or aproportional voltage supplied 302-06-04 byanexternal voltage transformer orvoltage divider or derived by means of an external series resistor current circuit (of a measuring instrument) (impedance). SECTION 302-07-TERMS REL4TING TO TECHNICAL CHARACTERISTICS 302-07-01 The torquewhich tends tobring the moving back to the mechanical zero of the instrument. deflecting torque driving torque 302-07-03 A torque resulting tiom e.g. electrostatic or braking torque (of an integrating instrument) electromagnetic effects on the moving element. The torqueresulting from the interaction of the field ot’ 302-07-02 afixed permanent magnet with the currents induced by itinthe rotor ofan integrating instrument and opposing restoring torque its rotation. 5

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