1、BRITISH STANDARD BS 4999-145:1987 Incorporating Amendment No. 1 General requirements for rotating electrical machines Part 145: Specification for winding terminations ICS 29.160.01 BS 4999-145:1987 This British Standard, having been prepared under the direction of the Power Electrical Engineering St
2、andards Committee, was published under the authority of the Board of BSI and comes into effect on 27 February 1987 BSI 22 April 2004 First published as BS 4999-71 February 1971 First revision February 1984 Second revision as BS 4999-145 February 1987 The following BSI references relate to the work o
3、n this British Standard: Committee reference PEL/1 Revision announced in BSI News October 1986 ISBN 0 580 15784 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Commi
4、ttee PEL/1, upon which the following bodies were represented: Association of Consulting Engineers Association of Electrical Machinery Trades Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) Association of Supervisory and Executive Engineers British Coal Bure
5、au of Engineer Surveyors ERA Technology Ltd. Electricity Supply Industry in England and Wales Engineer Surveyors Section of the ASTMS Engineering Equipment and Materials Users Association Health and Safety Executive Ministry of Defence Power Generation Association (BEAMA Ltd.) Rotating Electrical Ma
6、chines Association (BEAMA Ltd.) South of Scotland Electricity Board Amendments issued since publication Amd. No. Date Comments 14980 22 April 2004 Deletion of references to BS 5000-10 from Table 2 and Table 3BS 4999-145:1987 BSI 22 April 2004 i Contents Page Committees responsible Inside front cover
7、 Foreword ii 1S c o p e 1 2 Definitions 1 3R a t i n g s 2 4 Ability of terminations for machines rated at 1 100 V and above to withstand system faults 3 5 Electrical clearances 3 6 Arrangements and enclosures 4 Table 1 Nominal short-circuit capacity 3 Table 2 Minimum clearance distances in air to e
8、arth or between phases 3 Table 3 Minimum creepage distances in air to earth or between phases 4 Table 4 Combinations for termination assembly 4BS 4999-145:1987 ii BSI 22 April 2004 Foreword This part of BS 4999 has been prepared under the direction of the Power Electrical Engineering Standards Commi
9、ttee and supersedes BS 4999-71:1984, which is withdrawn. This part has been issued to implement the decision to renumber all the parts of BS 4999 to bring the part numbers more into line with those of IEC Publication 34. In addition to the renumbering of the part, the inclusion of the part number in
10、 the point numbering system, adopted in Part 71, has been abandoned. No technical changes have been made to the text of BS 4999-71:1984. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Briti
11、sh 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, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 4999
12、-145:1987 BSI 22 April 2004 1 1 Scope This part of this British Standard specifies types of and performance requirements for winding terminations for rotating electrical machines rated for a.c. voltages up to 15 kV r.m.s. Minimum creepage and clearance distances appropriate to the rated voltages are
13、 also specified. This standard does not specify requirements for the ability of the terminations of the following machines to withstand a high energy fault: a) machines rated for voltages up to and including 660 V, which it is assumed, would be protected by fuses or other energy limiting devices. b)
14、 machines rated for voltages of 1 100 V and above either protected by fuses or other energy limiting devices or intended for operation on a system where the nominal short-circuit capacity is lower than the relevant value given in Table 1. The standard applies to terminals, terminal boxes and termina
15、l enclosures, but it does not specify requirements for flameproof terminal enclosures. The choice of a particular termination will be largely governed by the service and environmental conditions, but the standard is also relevant to the various types of cables normally used, including aluminium and,
16、 where applicable, cable sealing and dividing boxes. It is outside the scope of this British Standard to cover external supply cables in detail, but insofar as the design of the terminals is concerned, essential data are listed. Winding terminations for small power machines having rated outputs up t
17、o and including 0.75 kW or kV A per 1 000 r/min, such as those specified in BS 5000-11, are not covered by this standard. NOTE The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this part of this British Standard, the fo
18、llowing definitions apply. 2.1 termination the arrangement provided for making the connections between the machine winding leads and the external conductors 2.2 terminal a conducting element of a winding intended for connection to an external electrical conductor 2.3 stud terminals a form of termina
19、tion in which the terminals are studs mounted integral with the machine frame or in a separate terminal enclosure 2.4 strip terminals a form of termination in which the terminals are strips mounted integral with the machine frame or assembly 2.5 loose leads a form of termination in which the ends of
20、 the machine winding are brought out as unsupported insulated flexible conductors 2.6 air insulated termination a termination so designed that the protection of phase conductors against electrical failure is by adequately spaced bare conductors with appropriate insulated supportsBS 4999-145:1987 2 B
21、SI 22 April 2004 2.7 cable coupler a form of termination in which the terminals are connected to the supply leads by means of a plug and socket device 2.8 separable insulated connectors a form of termination comprising a moulded bushing and insulated elbow connector coupling 2.9 separate terminal en
22、closure a form of termination in which the terminals are connected to the incoming supply leads inside a chamber which need not be fully enclosed and may be formed by the foundations beneath the machine 2.10 terminal box a form of terminal enclosure in which the terminals are connected to the incomi
23、ng supply leads inside a box which encloses the connections and is of a minimum size consistent with adequate access and with clearance and creepage distance requirements 2.11 pressure relief terminal box a terminal box so designed that the products of an electrical breakdown within the box are reli
24、eved through a pressure relief diaphragm 2.12 pressure containing terminal box a terminal box so designed that the products of an electrical breakdown within the box are safely contained 2.13 flameproof terminal box a terminal box designed to comply with flameproof requirements 2.14 air insulated te
25、rminal box a terminal box so designed that the protection of phase conductors against electrical failure within the terminal box is by adequately spaced bare conductors with appropriate insulated supports 2.15 phase insulated terminal box a terminal box so designed that the protection of phase condu
26、ctors against electrical failure within the terminal box is mainly by solid insulation 2.16 phase separated terminal box a terminal box so designed that phase separation is provided by earthed metal barriers within the single compartment so as to restrict any electrical breakdown to an earth fault 2
27、.17 phase segregated terminal box a terminal box so designed that phase segregation is provided by earthed metallic barriers forming completely distinct individual phase compartments so as to restrict any electrical break-down to an earth fault 3 Ratings Winding terminations shall be suitable for th
28、e machine rated voltage, rated current and rated frequency.BS 4999-145:1987 BSI 22 April 2004 3 4 Ability of terminations for machines rated at 1 100 V and above to withstand system faults Machine primary winding terminations, including internal flexible cables and connection cables between the powe
29、r supply cables and the motor windings, of machines for use on electrical systems having nominal short circuit MV A capacities equal to or greater than those in Table 1 shall be so rated that they will safely carry the fault current for the specified duration. NOTE The fault clearance time is usuall
30、y assumed to be not longer than 0.25 s for machines protected by circuit breakers. The maximum density of the fault current in the internal flexible and connecting cables and winding terminations shall not exceed 400 A/mm 2for copper and 250 A/mm 2for aluminium for the 0.25 s clearance time. Termina
31、l boxes for machines protected by circuit breakers and having nominal short circuit capacities equal to or higher than those in Table 1 shall be of either the pressure relief or pressure containing type. 5 Electrical clearances With the components of the terminations in the correct position, the cle
32、arances and creepage distances shall be not less than the values given in Table 2 and Table 3 respectively. Table 1 Nominal short-circuit capacity Table 2 Minimum clearance distances in air to earth or between phases Rated voltage Nominal short-circuit capacity VM V A 1 100 7.5 2 300 17.5 3 300 25.0
33、 4 160 31.5 6 600 50.0 11 000 70.0 13 800 80.0 15 000 90.0 Nominal voltage Machines with frame sizes Up to 160 180, 200 and 225 250 and 280 315 Ratings of other machines at nominal voltage Up to 22 kW Above 22 kW up to 75 kW Above 75 kW up to 185 kW Above 185 kW Vm mm mm mm m 660 6.4 8.0 10.0 12.5 1
34、 100 12.5 19.0 2 300 30.0 3 300 37.5 4 160 45.0 6 600 63.0 11 000 75.0 13 800 85.0 15 000 95.0BS 4999-145:1987 4 BSI 22 April 2004 Table 3 Minimum creepage distances in air to earth or between phases 6 Arrangements and enclosures When a terminal box is provided it shall be designed so that it remain
35、s clean and dry internally in service. The arrangements shall embody the relevant features selected from Table 4. NOTE BS 5372 specifies the dimensions which should be observed in the design of cable terminations for external cables on electrical equipment to enable the cables to be connected satisf
36、actorily. It relates to 3-core and 4-core 600/1 000 V and 3-core 1 900/3 300 V cables with solid and stranded aluminium conductors of size 16 mm 2to 300 mm 2and having polymeric insulation. Table 4 Combinations for termination assembly Nominal voltage Machines with frame sizes Up to 160 180, 200 and
37、 225 250 and 280 315 Ratings of other machines at nominal voltage U p t o2 2k W A b o v e2 2k W up to 75 kW Above 75 kW up to 185 kW Above 185 kW Vm mm mm mm m 660 11.2 12.5 12.5 19 1 100 19 25 230 0 40 330 0 50 416 0 60 660 0 90 11 000 125 13 800 140 15 000 150 NOTE Some designs of pressure contain
38、ing type terminal boxes may require the use of clearance and creepage distances smaller than the values given in Table 2 and Table 3. Termination arrangement Conducting part Type of terminal box for high fault levels V W 1100 MV A W values in Table 1 Stud Air insulated Strip Pressure containing term
39、inal box Phase insulated Cable coupler Phase separated Phase segregated Separable insulated connectors Pressure relief terminal box Separate terminal enclosure Loose leads NOTE The combination is to consist of any one of the termination arrangements given in column 1, combined with any one of the co
40、nducting parts given in column 2, combined with, for high fault levels, either of the terminal boxes given in column 3. BS 4999-145:1987 BSI 22 April 2004 5 Publications referred to BS 5000, Rotating electrical machines of particular types or for particular applications BS 5000-11, Small-power elect
41、ric motors and generators BS 5372, Specification for cable terminations for electrical equipmentBS 4999-145:1987 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on sta
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