1、BRITISH STANDARD BS EN 50216-7:2002 Power transformer and reactor fittings Part 7: Electric pumps for transformer oil The European Standard EN 50216-7:2002 has the status of a British Standard ICS 29.180 BS EN 50216-7:2002 This British Standard, having been prepared under the direction of the Electr
2、otechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 8 August 2002 BSI 8 August 2002 ISBN 0 580 40230 4 National foreword This British Standard is the official English language version of EN 50216-7:2002. The UK particip
3、ation in its preparation was entrusted to Technical Committee PEL/14, Power transformers, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or Europe
4、an publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all
5、 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. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on
6、 the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 20, an inside back cov
7、er and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50216-7 NORME EUROPENNE EUROPISCHE NORM January 2002 CENELEC European Committee for Electrotechnical Stan
8、dardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50216-7:2
9、002 E ICS 29.180 English version Power transformer and reactor fittings Part 7: Electric pumps for transformer oil Accessoires pour transformateurs de puissance et bobines dinductance Partie 7: Pompes lectriques pour transformateur immerg Zubehr fr Transformatoren und Drosselspulen Teil 7: Elektrisc
10、he Pumpen fr Transformatorenl This European Standard was approved by CENELEC on 2001-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-d
11、ate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation unde
12、r the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, I
13、reland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50216-7:2002 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 14, Power transformers. The text of the draft was submitted to the formal vote and w
14、as approved by CENELEC as EN 50216-7 on 2001-07-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-08-01 - latest date by which the national standards conflicting with
15、 the EN have to be withdrawn (dow) 2004-08-01 EN 50216-7 is to be read in conjunction with EN 50216-1. _- 3 - EN 50216-7:2002 Contents Page 1 Scope 4 2 Normative references. 4 3 Definitions. 5 4 Design . 5 4.1 General. 5 4.2 Casing/enclosure 6 4.3 Terminal box . 6 4.4 Hydraulic performance 6 4.5 Ele
16、ctrical performance 8 4.6 Noise. 8 4.7 Labelling . 8 5 Materials 9 6 Preferred sizes . 9 7 Tests 9 7.1 Routine tests. 9 7.2 Type tests . 10 7.3 Special tests . 12 8 Preparation for despatch. 12 8.1 Painting. 12 8.2 Preparation for transport and storage. 12 Annex A (normative) Preferred sizes of end-
17、suction pumps. 13 Annex B (normative) Preferred sizes of in-line pumps 15 Annex C (informative) Information required with enquiry, proposal and purchase order 17 Annex D (informative) Example of use of hydraulic interchangeability tolerances . 18EN 50216-7:2002 - 4 - 1 Scope EN 50216-7 covers requir
18、ements for electric pumps which generate the circulation of insulating oil in transformers and reactors conforming to the EN 60076 series and their associated cooling systems. The pumps covered in this standard are rotodynamic pumps driven by a squirrel cage induction motor which is immersed in the
19、insulating oil. Pump sets conforming to this standard may be of in-line or end suction design. This standard includes requirements for the electrical and hydraulic performance, mechanical design, routine testing and type testing. Additionally, performance and dimensions of preferred sizes of pump se
20、ts are specified (see normative annexes A and B). The insulating oils considered comply with subclause 2.5 of IEC 60296-1. If other insulating liquids are to be used, the performance and design of the pump shall be agreed between purchaser and manufacturer. 2 Normative references Addition to EN 5021
21、6-1: EN 809 1998 Pumps and pump units for liquids - Common safety requirements EN 60034-1 1998 Rotating electrical machines - Part 1: Rating and performance (IEC 60034-1:1996, mod) EN 60034-9 1997 Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:1997) EN 60076 Series Power transforme
22、rs (IEC 60076 series, mod) EN 60076-1 1997 Power transformers - Part 1: General (IEC 60076-1:1993, mod) HD 53.8 S5 1998 Rotating electrical machines - Part 8: Terminal markings and direction of rotation of rotating machines (IEC 60034-8:1972 + A1:1990 + A2:1996) HD 566 S1 1990 Thermal evaluation and
23、 classification of electrical insulation (IEC 60085:1984) IEC 60279 1969 Measurement of the winding resistance of an a.c. machine during operation at alternating voltage ISO 179 1993 Determination of Charpy impact strength ISO 185 1988 Grey cast iron - Classification ISO 281 1990 Rolling bearings -
24、Dynamic load ratings and rating life ISO 3522 1984 Cast aluminium alloys - Chemical composition and mechanical properties- 5 - EN 50216-7:2002 ISO 4406 1989 Hydraulic fluid power - Fluids - Methods for coding level of contamination by solid particles ISO 7005-2 1988 Metallic flanges - Part 2: Cast i
25、ron flanges ISO 9906 1999 Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1 and 2 3 Definitions For the purpose of this standard, the following definitions apply: 3.1 in-line pump a pump having the suction and delivery flanges on the same axis. It can be of the centrifugal or hel
26、icoidal type. For transformer oil pumps, the axis of the flanges generally corresponds to the axis of rotation of the pump rotor 3.2 end suction pump a pump having the suction and delivery flanges on perpendicular axes. It can be of the centrifugal type only. The axis of the suction flange correspon
27、ds to the axis of rotation of the pump rotor. 4 Design 4.1 General The requirements of EN 50216-1, including maximum oil temperature 115 C, shall apply to equipment covered by this standard. Minimum oil temperature shall be in accordance with EN 60076-1 -25 C. All pumps shall conform to the essentia
28、l health and safety requirements in accordance with EN 809. Motor cooling and bearing lubrication shall be by circulation of the oil being pumped. Where rolling element bearings are used, they shall be of standard design with life in accordance with ISO 281 exceeding 200 000 hours at rated condition
29、s. The expected life of the pump without bearing change shall not restrict the expected life of the transformer under normal service conditions. Pumps shall be suitable for mounting with the axis of the rotating unit either horizontal or vertical. If other positions are to be used, this shall be mad
30、e known to the manufacturer. A mechanical or electrical device shall be fitted, unless otherwise agreed by the purchaser, to allow the direction of rotation to be determined. Reverse rotation shall not cause damage to the pump. All enclosures for electric pumps shall be manufactured to give, as a mi
31、nimum, protection in accordance with IP 54 of EN 60529.EN 50216-7:2002 - 6 - For pumps used for combined OFF/ON cooling (e.g. with rated pressure of 50 kPa or less), the design of the pump and its impeller shall be such as to minimize the restriction to oil flow with the pump switched off. To ensure
32、 that there is no contamination of transformer oil, pump sets shall be clean and free of foreign bodies. 4.2 Casing/enclosure Casings/enclosures shall be capable of withstanding a maximum working pressure of 300 kPa under operating conditions without leakage. Suction and delivery flanges shall confo
33、rm to PN10 of ISO 7005-2 for end suction pumps and PN6 or PN10 for in-line pumps. These flanges shall generally be suitable to support the pump in normal operation. Where the pump design is such that additional supports are required, e.g. for high power end suction pumps, this shall be made known by
34、 the manufacturer. NOTE It is the responsibility of the transformer/cooling circuit designer to ensure that the pump is correctly supported. Drain and vent connections shall be provided suitable for the installation positions allowed. If required by the purchaser, internal surfaces of cast iron shal
35、l be finished with an oil resisting protective system. 4.3 Terminal box Metallic terminal boxes shall have an evacuation hole for condensation. The manufacturer shall specify the allowable terminal box and cable entry positions. It is preferred that the cable entry may be repositioned without draini
36、ng oil from the pump. The mounting support of the gland shall allow entry of cables in an upward direction for any mounting position of the pump. The size of the gland shall be defined by agreement between purchaser and manufacturer. An earth terminal is to be provided. A permanent label in accordan
37、ce with HD 53.8 shall be provided inside the terminal housing cover to show the connections required for correct rotation of the pump. Stud type terminals shall have a diameter adequate to carry the required current and not less than 6 mm for brass and not less than 4 mm for phosphor bronze or stain
38、less steel. 4.4 Hydraulic performance Performance curves and nominal ratings for hydraulic performance shall be given for an oil temperature of 60 C and with the motor being supplied at rated voltage. Performance curves shall define the allowable operating range as specified by the pump manufacturer
39、. Pumps shall perform free of cavitation under operating conditions.- 7 - EN 50216-7:2002 4.4.1 Hydraulic interchangeability When replacing one pump with another, it is important that flow velocities in the cooling circuit are not greatly changed. This may be achieved by ensuring that the pump chara
40、cteristic curves are sufficiently similar. For the purposes of this standard, hydraulic interchangeability is achieved when, for each point across the allowable operating range, one pump characteristic curve shows flow values within 10 % or pressure values within 8 % of another curve chosen as a dat
41、um (see Figure 1). Figure 1 - Hydraulic interchangeability across the allowable operating range Where, in a specific application, sufficient knowledge of the actual flow range is available, pump characteristic curves may be defined as interchangeable if the above condition is met across the actual f
42、low range (see Figure 2). Figure 2 - Hydraulic interchangeability across an actual flow rangeEN 50216-7:2002 - 8 - Annex D gives examples of the use of these hydraulic interchangeability tolerances. It should be noted that hydraulic interchangeability does not ensure electrical or mechanical interch
43、angeability and these will require a separate assessment. 4.5 Electrical performance 4.5.1 Electrical supply Pumps shall be suitable for direct-on-line starting with a supply voltage between 85 % and 110 % of the nominal voltage and within 94 % - 102 % of nominal frequency . Additionally, the pump s
44、hall be able to start at 85 % voltage at oil temperatures down to - 20 C and at 90 % down to - 25 C without injurious heating. Motors shall be capable of recovering normal operation in the event of a system disturbance causing temporary loss of supply voltage for a period of up to three seconds foll
45、owed by a sudden restoration initially to 80 % of the rated voltage. 4.5.2 Insulation class and temperature rise The stator winding insulation shall conform to HD 566 S1 Class B or F and shall be non- hygroscopic. The temperature rise of the motor winding when operating in oil at 115 C shall not exc
46、eed the oil temperature by more than 15 K for class B insulation and 40 K for class F. 4.5.3 Starting current The starting current at rated voltage shall not exceed seven times the rated full load current of the motor subject to the tolerances given in EN 60034-1, as appropriate. 4.6 Noise Sound pow
47、er levels shall not exceed the values given in EN 60034-9. 4.7 Labelling 4.7.1 Nameplate The nameplate shall carry the information as required by EN 60034-1. Additionally, the following shall also be included: CE marking (if applicable); rated flow (l/s) at 60 C; rated pressure, kPa.Other data may b
48、e added to the nameplate if required by the purchaser.4.7.2 Direction of oil flow and rotationThe direction of oil flow and the corresponding direction of rotation shall be indicated in distinctive places with a suitable arrow in a permanent form.- 9 - EN 50216-7:20025 MaterialsThe pump casing/enclo
49、sure may be manufactured of either cast iron to ISO 185 grade 200 minimum or aluminium alloy to ISO 3522 type Al-Si12. Other suitable materials agreed between the purchaser and manufacturer may also be used.External bolting shall be corrosion resistant.Rotating units shall be of all-metal construction to minimise the contribution to the electrostatic charging tendency of the overall system.The terminal box may be made from a suitable metal or glass reinforced plastic (GR
