《BS-7888-3-1998.pdf》由会员分享，可在线阅读，更多相关《BS-7888-3-1998.pdf（14页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 7888-3:1998 Incorporating Amendment No. 1 and Corrigendum No.1 LV and MV accessories for power cables with rated voltage from 0.6/1 kV (Um = 1.2 kV) up to and including 20.8/36 kV (Um= 42 kV) Part 3: Test requirements for LV accessories (Implementation of HD 623) ICS 29.120.20 ?
2、Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Stan
3、dards Board and comes into effect on 15 March 1998 BSI 2 May 2003 The following BSI references relate to the work on this standard: Committee reference GEL/20/11 Draft for comment 92/26317 DC ISBN 0 580 29502 8 Committees responsible for this British Standard The preparation of this British Standard
4、 was entrusted by Technical Committee GEL/20, Electric cables, to Technical Subcommittee GEL/20/11 (formerly GEL/20/7), Cable accessories, upon which the following bodies were represented: Association of Consulting Engineers BEAMA Electrical Cable and Conductor Accessory Manufacturers Association Br
5、itish Approvals Service for Cables British Cables Association Electrical Contractors Association Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Association ERA Technology Ltd. Institution of Lighting Engineers London Underground Ltd. Railway Industries Associati
6、on Amendments issued since publication Amd. No.DateComments 10017 Corr No. 1 April 1998Correction of erroneous clause references to BS 7888-2. 138982 May 2003Revisions to Clauses 1, 2, 5.1 and 6.1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:0
7、0 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 BSI 2 May 2003 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Terms and definitions1 4Operating conditions2 5Requirements2 6Type testing3 Table 1 Maximum rated conductor temperatures2 Table 2 Summa
8、ry of approvals for different cable insulations4 Table 3 Test sequence for joints for extruded insulation cables, transition joints between extruded insulation cables and impregnated paper insulated cables5 Table 4 Test sequence for stop ends on extruded insulation cables5 Table 5 Test sequence for
9、outdoor terminations on extruded insulation cables6 Table 6 Number of test samples and conductor size7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 ii BSI 2 May 2003 Foreword BS 7888 was prepa
10、red by Technical Subcommittee GEL/20/11. It implements nationally applicable parts of Harmonization Documents HD 623, 628, 629.1 and 629.2 published by the European Committee for Electrotechnical Standardization (CENELEC) in accordance with the decision of the CENELEC Technical Board. BS 7888 applie
11、s to accessories for power cables with rated voltage U0/U from 0.6/1 kV (Um= 1.2 kV) up to and including 20.8/36 kV (Um= 42 kV) and is published as a series of separate parts and sections, as listed in the table in the foreword of BS 7888-1. BS 7888-3 implements the relevant requirements of HD 623 a
12、nd is to be read in conjunction with BS 7888-1 and BS 7888-2. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced. WARNING. The methods of test des
13、cribed in this British Standard do not detail all precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the tests should only be performed by authorized personnel. This publication does not pu
14、rport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard 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,
15、 pages 1 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1
16、998 BSI 2 May 2003 1 1 Scope This British Standard specifies the performance requirements, verified by type testing, for joints, stop ends and outdoor terminations for cables of rated voltage 0.6/1.0 (1.2) kV, as defined in BS 7870-3. The accessories covered by this British Standard are as follows:
17、outdoor terminations for cables with extruded insulation; straight joints, branch joints and stop ends for cables with extruded insulation; transition joints between cables with extruded insulation and cables with impregnated paper insulation. Joints, stop ends and outdoor terminations for impregnat
18、ed paper insulated cables, and accessories for special applications such as submarine cables, ships cables or hazardous situations (explosive environments, fire-resistant cables or seismic conditions) do not fall within the scope of this British Standard. 2 Normative references The following referen
19、ced documents are indispensible for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 923-1:1990, Guide on high-voltage testing techniques Part 1: Genera
20、l. BS 7870-3:2001 (all sections), LV and MV polymeric insulated cables for use by distribution and generation utilities Part 3: Specification for distribution cables of rated voltage 0.6/1 kV. BS 7888-2:1998, LV and MV accessories for power cables with rated voltage from 0.6/1 kV (Um= 1.2 kV) up to
21、and including 20.8/36 kV (Um= 42 kV) Part 2: Methods of test. BS 7933, Electric cables Accessories Material characterization. HD 6231), Specification for joints, stop ends and outdoor terminations for distribution cables of rated voltage 0.6/1.0 kV. HD 6281), Test methods for accessories for power c
22、ables with rated voltage from 3.6 kV/6 kV (Um7.2 kV) up to and including 20.8/36 kV (Um= 42 kV). HD 629-11), Test requirements on accessories for use on power cables of rated voltages from 3.6 kV/6 kV (7.2) kV up to and including 20.8/36 (42) kV Part 1: Cables with extruded insulation. HD 629-21), T
23、est requirements on accessories for use on power cables of rated voltages from 3.6 kV/6 kV (7.2) kV up to and including 20.8/36 (42) kV Part 2: Cables with impregnated insulation. 3 Terms and definitions For the purposes of this part of BS 7888, the definitions given in Clause 3 of BS 7888-1:1998 ap
24、ply. 1)Referred to in the foreword only. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 2 BSI 2 May 2003 4 Operating conditions 4.1 General The service operating conditions of accessories shall
25、be compatible with the service operating conditions of the cable. 4.2 Rated voltage The rated voltage of the joints, stop ends and outdoor terminations shall be U0/U(Um) = 0.6/1.0 (1.2) kV, where: 4.3 Current rating The continuous current rating of a joint or outdoor termination shall be in accordan
26、ce with the appropriate cable(s) specified in BS 7870-3, and shall be suitable for continuous duty and operation under short-circuit conditions at the temperatures specified in Table 1. Table 1 Maximum rated conductor temperatures 5 Requirements 5.1 General Accessories within the scope of this Briti
27、sh Standard shall be type tested in accordance with Clause 6 for conformity to the requirements given in 5.2, 5.3, 5.4, 5.5, 5.6, 5.7 and 5.8. The publication of this standard does not invalidate existing approvals. However, products approved to such earlier standards or specifications shall not cla
28、im approval to this standard unless specifically tested to it. 5.2 Water penetration Joints and stop ends shall be tested in accordance with Clauses 5, 9, 15 and 16 of BS 7888-2:1998 for their ability to withstand a head of water. 5.3 A.C. voltage withstand There shall be no breakdown. 5.4 Thermal c
29、ycling The cores shall withstand an a.c. voltage of 4 kV for 1 min when tested in accordance with Clause 5 of BS 7888-2:1998 while the accessory is still immersed in water after the load cycling test. The insulation resistance, measured in accordance with Clause 15 of BS 7888-2:1998 after completion
30、 of the voltage test and while still immersed in water, shall be a minimum of 50 M. U0is the rated power frequency voltage between phase conductor and earth or metallic screen for which the cable accessory is designed; Uis the rated power frequency voltage between phase conductors for which the cabl
31、e accessory is designed; Umis the maximum value of the “highest system voltage” between phase conductors for which the accessory may be used. RatingInsulation type Extruded solid dielectricImpregnated paper Continuous a 80 C Short-circuit a 160 C a For cables with extruded insulation, the maximum ra
32、ted temperatures for continuous duty and short-circuit duty are given in the particular section of BS 7870-3. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 BSI 2 May 2003 3 5.5 Impact at ambien
33、t temperature The cores shall withstand an a.c. voltage of 4 kV for 1 min when tested in accordance with Clause 5 of BS 7888-2:1998 after the impact. The insulation resistance, measured in accordance with Clause 15 of BS 7888-2:1998 after completion of the voltage test, shall be a minimum of 50 M. 5
34、.6 Insulation resistance The insulation resistance shall be a minimum of 50 M prior to and after immersion in water. 5.7 Immersion The cores shall withstand an a.c. voltage of 4 kV for 1 min when tested in accordance with Clause 5 of BS 7888-2:1998 without breakdown. The insulation resistance, measu
35、red in accordance with Clause 15 of BS 7888-2:1998 after completion of the voltage test, shall be a minimum of 50 M. 5.8 Examination When examined in accordance with Clause 17 of BS 7888-2:1998, the accessory sample shall not show any of the following: a) cracking of filling media and/or tape or tub
36、ing components; b) a moisture path bridging a primary seal; c) active corrosion, such as would, in time, lead to failure of the joint. 6 Type testing 6.1 General Written reports on type tests that establish conformity to this standard shall be made available by the manufacturer. The major details of
37、 the test arrangements shall be given in the test report, including, for example, size of conductors, model and type of connector, minimum clearance between joint and shell. The test reports shall be signed by a representative of the body performing the tests. NOTEThis may be either the manufacturer
38、 or a recognized certification body. The profile of properties of the materials used for the main components of the accessory shall be identified in accordance with the appropriate part of BS 7933. If, during a test, there is a failure in a portion of cable that is outside any part of an accessory,
39、the test shall be declared void without discrediting the accessory. Tests may be repeated using a new accessory (in which case the test shall be repeated in its entirety) or, alternatively, the defective cable shall be repaired (in which case the testing shall continue from the point of failure). 6.
40、2 Range of approval 6.2.1 General Conformity to this British Standard shall be established for an accessory for a particular cable type (either copper or aluminium conductors) by successful testing in accordance with the appropriate test sequences given in Table 3, Table 4 and Table 5. Where conform
41、ity is established for accessories for two different cables sizes, accessories of any intermediate size are deemed also to conform. Where conformity is established for one size only, no other size is deemed to conform. Licensed Copy: London South Bank University, London South Bank University, Fri De
42、c 08 12:29:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7888-3:1998 4 BSI 2 May 2003 6.2.2 Insulation and sheathing Conformity to this British Standard established by successful testing of a particular type of cable insulation is deemed to extend to other types of insulation in accordance with T
43、able 2. Table 2 Summary of approvals for different cable insulations NOTEIt should be noted that adhesion between the cable insulation and the accessorys filling compound is critical for the performance of some joint designs. Conformity established for a cable with one type of sheathing material sha
44、ll not be extended to an otherwise identical cable that incorporates a different sheathing material. 6.2.3 Joints and stop ends Where, for a given range of cable sizes, branch joints have been successfully tested in accordance with this British Standard, straight joints and stop ends for the same ra
45、nge of cable sizes may be deemed to conform if it can be shown that the construction is similar and the seals are of the same type and not inferior to those of the branch joints tested. 6.2.4 Transition joints Where a transition joint has been successfully tested in accordance with this British Stan
46、dard, a similar design of transition joint suitable for an alternative type of extruded insulation cable shall be deemed to conform if the following conditions are met. The impregnated paper-insulated cable side of the joint shall be identical in design. Conformity of the alternative extruded insula
47、tion cable shall have been established in a straight or branch joint, as relevant, and satisfactory performance of the moisture seals shall have been established by examination in accordance with Clause 17 of BS 7888-2:1998. 6.3 Test samples The number of samples required for each test sequence shal
48、l be in accordance with Table 6. Cables used for testing shall conform to BS 7870-3 and shall be identified in the test report in respect of: rated voltage; material, shape and cross-section of conductors; details of construction (insulation and sheath, number of cores, water blocking etc.); princip
49、al dimensions of cable. The connecting components used in a joint or termination shall conform to the appropriate specification. Accessories to be tested shall be correctly identified in respect of: name of manufacturer; type, designation, manufacturing date or date code; minimum and maximum cable cross-section, material and shape of conductor; smallest and largest cable diameter; rated voltage; installation instructions. Accessories shall