《BS-7922-2004.pdf》由会员分享，可在线阅读，更多相关《BS-7922-2004.pdf（46页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 7922:2004 Electric cables Fluid-filled, paper- and PPL-insulated, metal-sheathed cables and accessories for alternating voltages up to and including 400 kV (Um= 420 kV) Requirements and test methods (Implementation of HD 633) ICS 29.060.20 ? Licensed Copy: London South Bank Unive
2、rsity, London South Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 4 August 2004 BSI 4 August 2004 The following BSI references relate to the work
3、on this British Standard: Committee reference GEL/20/16 Draft for comment 95/215974 DC ISBN 0 580 38553 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittees GEL/20/16, Medium/high vo
4、ltage cables, upon which the following bodies were represented: British Approvals Service for Cable British Cables Association British Plastics Federation Energy Networks Associations ERA Technology Ltd. Co-opted members Amendments issued since publication Amd. No.DateComments Licensed Copy: London
5、South Bank University, London South Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 BSI 4 August 2004 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Terms and definitions2 4Voltage designation2 5Charact
6、eristics of cables and accessories3 6Test categories, frequency and conditions3 7Routine tests on cables5 8Sample tests on cables7 9Routine tests on accessories9 10Sample tests on accessories10 11Type tests on cables and accessories11 12Non-electrical type tests on cables17 13Non-electrical type tes
7、ts on accessories20 14Tests and requirements for direct reading pressure gauges22 15Tests after installation28 16Tests on ancillary equipment32 Annex A (informative) Methods of heating cable samples40 Annex B (informative) Pressure drop40 Bibliography41 Figure 1 Diagram showing internal electrical c
8、onnections25 Table 1 Number of samples for sample tests4 Table 2 Tan measurement requirements for paper insulated cables6 Table 3 Tan measurement requirements for PPL insulated cables6 Table 4 Standard values of system voltages and test voltages recommended for cables to be used in 3-phase systems7
9、Table 5 Test cylinder diameters for bending test8 Table 6 Internal test pressure9 Table 7 Pressure/volume characteristics10 Table 8 Waveshape15 Table 9 Voltage levels15 Table 10 Lightning impulse test voltage levels17 Table 11 Impulse voltage test levels21 Table 12 Salt fog test voltage levels21 Tab
10、le 13 Classification of gauges22 Table 14 Climatic chamber temperatures for temperature limit tests26 Table 15 High voltage test levels29 Table 16 SVL test parameters29 Table 17 Maximum contact resistance values30 Table 18 Construction of single core bonding leads33 Table 19 Construction of concentr
11、ic bonding leads33 Table 20 Test voltages for bonding leads35 Table 21 Conductor resistance35 Table 22 Short circuit requirements37 Table 23 Impulse voltage withstand levels39 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled
12、Copy, (c) BSI BS 7922:2004 ii BSI 4 August 2004 Foreword This British Standard has been prepared by Subcommittee GEL/20/16. It implements the nationally applicable parts of Harmonization Document HD 633 published by the European Committee for Electrotechnical Standardization (CENELEC), in accordance
13、 with the decision of the CENELEC Technical Board. BS 7922 applies to fluid-filled, paper- and PPL-insulated, metal-sheathed cables and accessories for alternating voltages up to and including 400 kV (Um= 420 kV). It has been assumed in the preparation of this British Standard that the execution of
14、its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does
15、not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 41 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London S
16、outh Bank University, London South Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 BSI 4 August 2004 1 1 Scope This British Standard specifies tests and requirements for radial field, fluid-filled, paper or polypropylene paper laminate (PPL) insulated met
17、al-sheathed cables and their accessories, which operate with a minimum static pressure of between 20 kPa (0.2 bar) and 300 kPa (3.0 bar) inclusive, a maximum static pressure of not more than 800 kPa (8.0 bar) and a minimum transient pressure of not less than 20 kPa (0.2 bar)1). NOTEThe cables in thi
18、s British Standard are specifically excluded from the scope of the Pressure Equipment Directive. It also specifies tests for cables and accessories with maximum static pressures exceeding 800 kPa (8.0 bar). This British Standard is applicable to cables and accessories intended for use in systems wit
19、h nominal voltages not exceeding 400 kV between phases. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
20、ding any amendments) applies. BS 228:1994, Specification for short-pitch transmission precision roller chains and chain wheels. BS 4727-2:Group 08, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 2: Terms particular to power engineering Group 08: E
21、lectric cables. BS 6346, Specification for 600/1 000 V and 1 900/3 300 V armoured electric cables having PVC insulation. BS 6500:2000, Electric cables Flexible cords rated up to 300/500 V, for use with appliances and equipment intended for domestic, office and similar environments. BS 7912, Power ca
22、bles with XLPE insulation and metallic sheath, and their accessories, for rated voltages from 66 kV (Um = 72.5 kV) to 132 kV (Um = 145kV) Requirements and test methods. BS EN 50062, Specification for ceramic pressurized hollow insulators for high-voltage switchgear and controlgear. BS EN 60068-2-1,
23、Environmental testing Part 2: Test methods Section 2-1: Tests A Cold. BS EN 60068-2-2, Environmental testing Part 2: Test methods Section 2-2: Tests B Dry heat. IEC 60060-1, High-voltage test techniques Part 1: General definitions and test requirements.2) IEC 60060-2, High-voltage test techniques Pa
24、rt 2: Measuring systems. IEC 60228:1978, Conductors of insulated cables.3) IEC 60229:1982, Tests on cable oversheaths which have a special protective function and are applied by extrusion. IEC 60230, Impulse tests on cables and their accessories.4) IEC 60507:1991, Artificial pollution tests in high-
25、voltage insulators to be used on a.c. systems. IEC 60554-2, Specification for cellulose papers for electrical purposes Part 2: Methods of test. IEC/TS 60859, Cable connections for gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above Fluid-filled and extruded insulation cab
26、les Fluid-filled and dry type cable-terminations. 1)These pressures are above atmospheric pressure. 2)Published by BSI as BS 923-1. 3)Published by BSI as BS 6360. 4)Implemented by CENELEC as HD 48. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:06:44 GMT+00:
27、00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 2 BSI 4 August 2004 3 Terms and definitions For the purposes of this British Standard, the definitions given in BS 4727-2:Group 08 and the following apply. 3.1 cables screened with carbon-black paper cables where carbon-black paper is applied as a scr
28、een over the conductor and where the carbon-black paper is in contact with the insulation 3.2 cables not screened with carbon-black paper cables where the screen over the conductor consists of any material other than carbon-black paper, or is such that carbon-black paper, if present, is not in conta
29、ct with the insulation NOTEFor the purpose of this British Standard, cables with unscreened conductors are included in this group. 3.3 rated voltage U0 nominal power-frequency voltage between conductor and core screen for which the cable and its accessories are suitable 3.4 rated voltage U nominal p
30、ower-frequency voltage between any two conductors for which the cable and its accessories are suitable 3.5 maximum voltage Um maximum value of the highest permissible system voltage for which the cable and its accessories are suitable 3.6 peak voltage Up peak value of the impulse withstand voltage f
31、or which the cable and its accessories are suitable 4 Voltage designation Cables and accessories shall be designated by the rated voltage between conductor and core screen U0 and by the rated voltage between conductors U, both in kilovolts, e.g. 76/132 kV. Cables shall be operated in a system of the
32、 following categories. a) Category A comprises those systems where earth faults are cleared as rapidly as possible by in any case within 1 min. b) Category B comprises those systems which, under fault conditions, are operated for a short time with one phase earthed. NOTEAccording to IEC 60183, this
33、period should not exceed 1 h. For cables in this British Standard, a longer period not exceeding 8 h on any occasion can be tolerated. The total duration of earth faults per year should not exceed 125 h. c) Category C: cables covered by BS 7922 are not intended for operating in category C systems. W
34、here there is such a requirement, agreement on the design of cables and accessories shall be made between the purchaser and the manufacturer. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 BSI 4 A
35、ugust 2004 3 5 Characteristics of cables and accessories For the purpose of carrying out and recording the tests described in this British Standard, the following characteristics shall be known or declared for each cable tested: a) rated voltage U0, in kilovolts (kV); b) lightning impulse withstand
36、voltage Up, in kilovolts (kV); NOTE 1The lightning impulse withstand voltage Up specified above for each particular cable should be selected in accordance with IEC 60071-1. c) type of conductor, material, nominal cross-sectional area of the conductors in square millimetres (mm2), and conductor resis
37、tance (for conductor resistances, see 7.2); d) conductor resistance, if the nominal cross-sectional area is not in accordance with the values given in IEC 60228; e) number of cores; f) capacitance between each conductor and core screen, in microfarads per kilometre (4F/km); g) maximum permissible co
38、nductor temperature, in degrees Celsius (C), for continuous operation under the specified ambient and installation conditions; h) minimum and maximum permissible static fluid pressure, in kilopascals (kPa) or bars5); i) type and material of the metallic sheath and the construction of the sheath rein
39、forcement, if any; j) thermal resistance between conductor(s) and metallic sheath, in kelvin metres per watt (Km/W); NOTE 2The thermal resistance should be calculated using the formulae given in IEC 60287-2-1. k) cable design stress, in kilovolts per millimetre (kV/mm); l) maximum design pressures o
40、f accessories, in kilopascals (kPa) (see Clause 9); m) type of conductor screen (with or without carbon-black paper); n) specified minimum thickness of insulation, nominal thickness of the metallic sheath and anti- corrosion covering, in millimetres (mm); o) nominal outside diameter of the cable and
41、 conductor, in millimetres (mm); p) type and material of the corrosion-resistant covering over the metallic sheath. The following additional characteristics shall be stated by the manufacturer when requested by the purchaser: 1) maximum current rating in amperes (A) under the specified installation
42、and operating conditions; 2) estimated effective (a.c.) resistance in ohms per kilometre (7/km) of the cable at the maximum operating temperature and under the specified installation conditions; 3) estimated inductance in henrys per kilometre (H/km) per phase of the completed cable under the specifi
43、ed installation conditions. 6 Test categories, frequency and conditions 6.1 Categories of tests NOTETests classified as sample or routine might be required as part of any type approval scheme. 6.1.1 Routine tests Tests made on all production cable lengths and accessories to demonstrate their integri
44、ty. 6.1.2 Sample tests Test made on samples of completed cable or accessories, or components taken from a completed cable or accessory, adequate to verify whether the finished product meets the design specifications. 5)1 bar = 105N/m2 = 105 Pa. Licensed Copy: London South Bank University, London Sou
45、th Bank University, Fri Dec 08 12:06:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7922:2004 4 BSI 4 August 2004 6.1.3 Type tests Test required to be made before supplying a type of cable or accessory covered by this standard on a general commercial basis in order to demonstrate satisfactory perf
46、ormance characteristics to meet the intended application. These tests are of such a nature that, after they have been made, they need not be repeated unless changes are made in the cable materials, design or type of manufacturing process, which might change the performance characteristics. 6.1.4 Tes
47、ts after installation Tests intended to demonstrate the integrity of the cable and its accessories after installation and before use. 6.2 Frequency of tests 6.2.1 Frequency of measurements of dimensions This test shall be carried out on not more than 10 % of the number of delivery lengths, on at lea
48、st one length, unless otherwise specified by the purchaser at the time of enquiry. 6.2.2 Frequency of mechanical tests Provided that the total length of cable supplied to the purchaser under a single contact exceeds 2 km of 3-core cable or 4 km of single core cable, tests shall be carried out in acc
49、ordance with the number of samples specified in Table 1. Table 1 Number of samples for sample tests 6.3 Test conditions 6.3.1 Ambient temperature Unless otherwise specified in the details for the particular test, tests shall be made at an ambient temperature of (20 15) C. 6.3.2 Frequency of waveform of power frequency test voltage The frequency of the alternating test voltages shall be in the range 49 Hz to 61 Hz. The