BS 7578-1992 Coupling capacitors and capacitor dividers《耦合电容器和电容器分压器》.pdf

1、BRITISH STANDARD BS 7578:1992 IEC 358:1990 Coupling capacitors and capacitor dividers (Implementation of CENELEC HD 597 S1)BS7578:1992 This British Standard, having been prepared under the directionof the Power Electrical Engineering Standards Policy Committee, was published underthe authority of th

2、e Standards Board and comes intoeffect on 15 June 1992 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PEL/46 Draft for comment 83/22801 DC ISBN 0 580 20846 X Committees responsible for this British Standard The preparation of this British Standard w

3、as entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to Technical Committee PEL/46, upon which the following bodies were represented: Association of Consulting Engineers British (AC) Capacitor Manufacturers Association (BEAMA Ltd.) ERA Technology Ltd. Electricity Assoc

4、iation Rotating Electrical Machines Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Date CommentsBS7578:1992 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of HD 597 S1 5 National annex NA (informative) Cross-reference

5、s Inside back coverBS7578:1992 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee. It is identical with IEC358:1990 Coupling capacitors and capacitor dividers published by the International Elect

6、rotechnical Commission (IEC). This British Standard implements CENELEC Harmonization Document HD597S1. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standa

7、rd does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theHD title page, pages2 to28, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amen

8、dments incorporated. This will be indicated in the amendment table on the inside front cover.HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 597 S1 January 1992 UDC 621.319.4:620.1 Incorporates Corrigendum March 1992 Descriptors: Power capacitor, coupling capacitor, capacit

9、or voltage divider, test English version Coupling capacitors and capacitor dividers (IEC 358:1990) Condensateurs de couplage et diviseurs capacitifs (CEI 358:1990) Kopplungskondensatoren und kapazitive Teiler (IEC 358:1990) This Harmonization Document was approved by CENELEC on 1991-12-10. CENELEC m

10、embers are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central

11、Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands

12、, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1992 Copyright

13、reserved to CENELEC members Ref. No. HD 597 S1:1992 EBS7578:1992 2 BSI 09-1999 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC 358:1990 could be accepted without textual changes, has shown that no CENELEC common modifications were

14、 necessary for the acceptance as Harmonization Document. The reference document was submitted to theCENELEC members for formal vote and wasapproved by CENELEC as HD597 S1 on10December1991. The following dates were fixed: For products which have complied with the relevant national standard before1992

15、-12-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until1997-12-01. Annexes designated “normative” are part of the body of the standard. In this standard,Annex ZA is normative. Contents Page Foreword 2 Section 1. General 1 Sco

16、pe 5 2 Object 5 3 Definitions 5 4 Service conditions 8 Section 2. Quality requirements and tests 5 Test requirements 9 6 Classification of tests 9 7 Capacitance measurement at power frequency 10 8 Capacitor loss measurement 11 9 Voltage tests 11 10 Voltage test between low voltage terminal and earth

17、 terminal 13 11 Discharge test 13 12 High frequency measurements (only for coupling capacitors and capacitor dividers intended for carrier coupling) 14 13 Partial discharge test 14 14 Determination of the temperature coefficient 16 15 Sealing test 16 16 Cantilever test 16 Section 3. Insulation level

18、s and creepage distance 17 Insulation levels and test voltages 17 18 Creepage distance 18 Section 4. Safety requirements 19 Connections to metal parts 19 20 Protection of the environment 19 21 National regulations 19 Section 5. Markings 22 Marking of the capacitor unit 19 23 Marking of the capacitor

19、 stack 19 Section 6. Guide for installation and operation 24 General 20 25 Choice of rated voltage 20 26 Choice of insulation level 20 27 Operating temperature 21 28 Special conditions 21 29 Mechanical stress 22 latest date of announcement of the HD atnational level (doa) 1992-06-01 latest date of p

20、ublication ofa harmonized national standard (dop) 1992-12-01 latest date of withdrawal ofconflicting national standards (dow) 1992-12-01BS7578:1992 BSI 09-1999 3 Page Appendix A Capacitor diagrams 23 Appendix B High frequency characteristics ofcoupling capacitors for power line carrier circuits 24 A

21、nnex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 28 Figure A.1 Capacitor for overvoltage protection 23 Figure A.2 Capacitor for power line carrier coupling 23 Figure A.3 Capacitor divider (part of capacitorvoltage t

22、ransformer, not used for connection for power line carrier coupling) 23 Figure A.4 Capacitor divider (part of capacitorvoltage transformer, with connection forpower linecarrier coupling) 24 Figure B.1 Bridge method for measuring the high frequency capacitance and equivalent series resistance of a co

23、upling capacitor 26 Figure B.2 Wiring diagram of the measuringcircuit for the high frequency capacitance and equivalent series resistanceofacoupling capacitor 27 Table I 9 Table II 15 Table III Standard insulation levels for12kVk U m 300kV 17 Table IV Standard insulation levels for U m U 300 kV 184

24、blankBS7578:1992 BSI 09-1999 5 Section 1. General 1 Scope This standard is applicable to: a) coupling capacitors for power line carrier (PLC) systems on high voltage overhead power lines, the power-frequency range being15Hz to60Hz, and the carrier frequency range30kHz to500kHz; b) capacitor dividers

25、 of capacitor voltage transformers. Additional requirements for capacitor voltage transformers are given in IEC Publication186; c) capacitors with one terminal either permanently earthed or at low voltage as used for overvoltage protection and other similar uses. NOTE 1Diagrams of capacitors to whic

26、h this standard applies are given inFigure A.1 to Figure A.4 inAppendix A. NOTE 2The following capacitors are excluded from this standard: shunt capacitors fora.c.power systems having a rated voltage above660V (IEC Publication871); shunt power capacitors of the self-healing type fora.c.systems havin

27、g a rated voltage up to and including660V (IECPublication831); shunt power capacitors of the non self-healing type fora.c.systems having a rated voltage up to and including660V (IECPublication931); capacitors for inductive heat generating plants operating at frequencies between40 and24000 Hz (IEC Pu

28、blication110); series capacitors (IEC Publication143); capacitors for motor applications and the like (IEC Publication252); capacitors to be used in power electronics circuits (IEC Publication under consideration); capacitors for use in tubular fluorescent and other discharge lamp circuits (IEC Publ

29、ication566); capacitors for suppression of radio interference (IEC Publication384-14); capacitors intended to be used in various types of electrical equipment and therefore considered as components; capacitors intended for use with d.c.voltage superimposed on thea.c.voltage. 2 Object The object of t

30、his standard is: a) to formulate uniform rules regarding performance, testing and rating; b) to formulate specific safety rules; c) to provide a guide for installation and operation. 3 Definitions 3.1 capacitor element (or element) a device consisting essentially of two electrodes separated by a die

31、lectric (IEV436-01-03 1) ) 3.2 capacitor unit (or unit) an assembly of one or more capacitor elements in the same container with terminals brought out (IEV436-01-04) NOTE 1A common type of unit for coupling capacitors has a cylindrical housing of insulating material and metal end flanges which serve

32、 as terminals. NOTE 2Units in metal containers usually have one terminal connected to the container and the other brought out through a bushing. 3.3 capacitor stack (or stack) an assembly of capacitor units connected in series (IEV436-01-05) NOTEThe capacitor units are usually mounted in a vertical

33、array. 3.4 capacitor a general term used when it is not necessary to state whether reference is made to a capacitor unit or to a capacitor stack 1) IEC Publication50(436) (in preparation).BS7578:1992 6 BSI 09-1999 3.5 rated capacitance of a capacitor (C N ) the capacitance value for which the capaci

34、tor has been designed NOTEThis definition applies: for a capacitor unit, to the capacitance between the terminals of the unit; for a capacitor stack, to the capacitance between line and low voltage terminals or between line and earth terminals of the stack; for a capacitor divider, to the resultant

35、capacitance: C 1 C 2 /(C 1 + C 2 ) 3.6 rated frequency of a capacitor (f N ) the frequency for which the capacitor has been designed (IEV436-01-14) 3.7 rated voltage of a capacitor (U N ) the r.m.s.value of the alternating voltage for which the capacitor has been designed (IEV436-01-15) 3.8 rated te

36、mperature category of a capacitor the range of temperature of the ambient air or of the cooling medium for which the capacitor has been designed (IEV436-01-17) 3.9 capacitor voltage divider a capacitor stack forming an alternating voltage divider (IEV436-02-10) NOTE 1SeeFigure A.3 and Figure A.4, Ap

37、pendix A. NOTE 2A capacitor divider usually forms part of a capacitor voltage transformer. 3.10 coupling capacitor a capacitor used for the transmission of signals in a power system (IEV436-02-11) 3.11 high voltage capacitor (of a capacitor divider) (C 1 ) the capacitor connected between the line te

38、rminal and the intermediate voltage terminal of a capacitor divider (IEV436-02-12) 3.12 intermediate voltage capacitor (of a capacitor divider) (C 2 ) the capacitor connected between the intermediate voltage and the low voltage terminals of a capacitor divider (IEV436-02-13) 3.13 line terminal a ter

39、minal intended for connection to a line conductor of a network (IEV436-03-01) 3.14 earth terminal a terminal intended for connection to earth (IEV436-03-02) 3.15 intermediate voltage terminal of a capacitor divider a terminal intended for connection to an intermediate circuit, such as the electromag

40、netic unit of a capacitor voltage transformer (IEV436-03-03) 3.16 low voltage terminal of a capacitor divider a terminal intended for connection to earth either directly or via an impedance of negligible value at network frequency (IEV436-03-04) NOTEIn a coupling capacitor, this terminal is also con

41、nected to the carrier frequency coupling device.BS7578:1992 BSI 09-1999 7 3.17 capacitance tolerance the permissible difference between the actual capacitance and the rated capacitance under specified conditions (IEV436-04-01) NOTEThe actual capacitance should be measured at, or referred to, the tem

42、perature at which the rated capacitance is defined. 3.18 equivalent series resistance of a capacitor a virtual resistance which, if connected in series with an ideal capacitor of capacitance value equal to that of the capacitor in question, would have a power loss equal to the active power dissipate

43、d in that capacitor under specified operating conditions (IEV436-04-02) 3.19 high frequency capacitance the effective capacitance at a given frequency resulting from the combined effect of the intrinsic capacitance and the self-inductance of a capacitor (IEV436-04-03) 3.20 open-circuit intermediate

44、voltage of a capacitor divider the voltage across the terminals of an intermediate voltage capacitor when a voltage is applied between the line and low voltage terminals, no impedance being connected in parallel with the intermediate voltage capacitor (IEV436-04-04) 3.21 ratio of a capacitor divider

45、 (voltage ratio) the ratio of the voltage applied to the capacitor divider to the open-circuit intermediate voltage (IEV436-04-05) NOTE 1This ratio corresponds to the sum of the capacitances of the high voltage and intermediate voltage capacitors divided by the capacitance of the high voltage capaci

46、tor: (C 1 + C 2 )/C 1 NOTE 2C 1and C 2include the stray capacitances, which are generally negligible. 3.22 capacitor losses the active power dissipated in the capacitor (IEV436-04-10) 3.23 tangent of the loss angle (ten $) of a capacitor the ratio between the equivalent series resistance and the cap

47、acitive reactance of a capacitor at specified sinusoidal alternating voltage and frequency (IEV436-04-11) 3.24 highest voltage for equipment (U m ) the highest r.m.s.phase-to-phase voltage for which the equipment is designed, in respect of its insulation as well as other characteristics which relate

48、 to this voltage in the relevant equipment standards this voltage shall be equal to or higher than the maximum value of the highest voltage of the system for which the equipment may be used 3.25 rated short-duration power-frequency withstand voltage the prescribed r.m.s.value of sinusoidal power-fre

49、quency voltage that the equipment shall withstand during tests made under specified conditions and for a duration of1min unless otherwise specified 3.26 rated switching (lightning) impulse withstand voltage the prescribed peak value of the switching (lightning) impulse withstand voltage which characterizes the insulation of an equipment as regards the withstand testsBS7578:1992 8 BSI 09-1999 3.27 rated insulation level a) For capacitors with highest voltage for equipment equal to or greater than300kV: the rated switch