1、BRITISH STANDARD BS EN 502 16-712002 Power transformer and reactor fittings Part 7: Electric pumps for transformer oil The European Standard EN 50216-7:2002 has the status ofa British Standard ICs 29.180 British Standards NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 5
2、0216-712002 National foreword This British Standard is the official English language version of The UKparticipation in its preparation was entrusted to Technical Committee PEL/14, Power transformers, which has the responsibility to: EN 50216-712002. - - aid enquirers to understand the text; present
3、to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be
4、obtained on request to its secretary. Cross-references The British Standards which implement international or European 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”faci1i
5、ty ofthe BSI Electronic Catalogue or ofBritish Stan dards Online. 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 not ofitself confer immunity from legal obligations. T
6、his British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 8 August 2002 Summary of pages This document comprises a front cover, an inside front cover
7、, the EN title page, pages 2 to 20, an inside back cover 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. I Date I Comments O BSI 8 August 2002 ISBN O580402304 EUROPEAN STANDARD EN 50216-7 NOR
8、ME EUROPENNE EUROPISCHE NORM January 2002 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 fr Transformatorenl Zubeh
9、r fr Transformatoren und Drosselspulen Teil 7: Elektrische Pumpen This European Standard was approved by CENELEC on 2001-07-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national stand
10、ard without any alteration. Up-to-date 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 othe
11、r language made by translation under 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,
12、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische
13、Normung Central Secretariat: rue de Stassart 35. B - 1050 Brussels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50216-7:2002 E EN 5021 6-7:2002 -2- Foreword This European Standard was prepared by the Technical Committee
14、CENELEC TC 14, Power transformers. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 5021 6-7 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
15、or by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2002-08-01 (dow) 2004-08-01 EN 50216-7 is to be read in conjunction with EN 50216-1. -3- Contents EN 5021 6-7:2002 Page Scope 4 Normative references . 4 Definit ions . 5 Design . 5 4.1
16、General . 5 4.2 Casinglenclosure 6 4.3 Terminal box . 6 4.4 Hydraulic performance 6 4.5 Electrical performance 8 4.6 Noise . 8 4.7 Labelling . 8 Mate ri als 9 Preferred sizes . 9 Tests 9 7.1 Routine tests . 9 7.2 Type tests . 10 7.3 Special tests . 12 Preparation for transport and storage . 12 Prepa
17、ration for despatch . 12 8.1 Painting . 12 8.2 Annex A (normative) Preferred sizes of end-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 hydraul
18、ic interchangeability tolerances . 18 EN 5021 6-7:2002 -4- 1 Scope EN 5021 6-7 covers requirements for electric pumps which generate the circulation of insulating oil in transformers and reactors conforming to the EN 60076 series and their associated coo I in g systems . The pumps covered in this st
19、andard are rotodynamic pumps driven by a squirrel cage induction motor which is immersed in the 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
20、testing and type testing. Additionally, performance and dimensions of preferred sizes of pump sets 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 pum
21、p shall be agreed between purchaser and manufacturer. 2 Normative references Addition to EN 50216-1: EN 809 EN 60034-1 EN 60034-9 EN 60076 EN 60076-1 HD 53.8 S5 HD 566 SI IEC 60279 IS0 179 IS0 185 IS0 281 IS0 3522 1998 1998 1997 Series 1997 1998 1990 1969 1993 1988 1990 1984 Pumps and pump units for
22、 liquids - Common safety requirements Rotating electrical machines - Part 1 : Rating and performance (IEC 60034-1 : 1996, mod) Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:1997) Power transformers (IEC 60076 series, mod) Power transformers - Part 1 : General (IEC 60076-1 : 1993,
23、mod) Rotating electrical machines - Part 8: Terminal markings and direction of rotation of rotating machines (IEC 60034-8: 1972 + AI : 1990 + A2: 1996) Thermal evaluation and classification of electrical insulation (IEC 60085:1984) Measurement of the winding resistance of an a.c. machine during oper
24、ation at alternating voltage Determination of Charpy impact strength Grey cast iron - Classification Rolling bearings - Dynamic load ratings and rating life Cast aluminium alloys - Chemical composition and mechanical properties -5- EN 5021 6-7:2002 IS0 4406 1989 Hydraulic fluid power - Fluids - Meth
25、ods for coding level of contamination by solid particles IS0 7005-2 1988 Metallic flanges - Part 2: Cast iron flanges IS0 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
26、 pump a pump having the suction and delivery flanges on the same axis. It can be of the centrifugal or helicoidal 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 flang
27、es on perpendicular axes. It can be of the centrifugal type only. The axis of the suction flange corresponds to the axis of rotation of the pump rotor. 4 Design 4.1 General The requirements of EN 50216-1, including maximum oil temperature I 15 “CI, shall apply to equipment covered by this standard.
28、Minimum oil temperature shall be in accordance with EN 60076-1 -25 “CI. All pumps shall conform to the essential 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, t
29、hey shall be of standard design with life in accordance with IS0 281 exceeding 200 O00 hours at rated conditions. The expected life of the pump without bearing change shall not restrict the expected life of the transformer under normal service cond i tions . Pumps shall be suitable for mounting with
30、 the axis of the rotating unit either horizontal or vertical. If other positions are to be used, this shall be made 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 rot
31、ation shall not cause damage to the pump. All enclosures for electric pumps shall be manufactured to give, as a minimum, protection in accordance with IP 54 of EN 60529. EN 5021 6-7:2002 -6- For pumps used for combined OFF/ON cooling (e.9. with rated pressure of 50 kPa or less), the design of the pu
32、mp and its impeller shall be such as to minimize the restriction to oil flow with the pump switched off. To ensure 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 maximu
33、m working pressure of 300 kPa under operating conditions without leakage. Suction and delivery flanges shall conform to PNIO of IS0 7005-2 for end suction pumps and PN6 or PNIO for in-line pumps. These flanges shall generally be suitable to support the pump in normal operation. Where the pump design
34、 is such that additional supports are required, e.g. for high power end suction pumps, this shall be made known by the manufacturer. NOTE supported. It is the responsibility of the transformerkooling circuit designer to ensure that the pump is correctly Drain and vent connections shall be provided s
35、uitable for the installation positions allowed If required by the purchaser, internal surfaces of cast iron shall 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
36、 terminal box and cable entry positions. It is preferred that the cable entry may be repositioned without draining 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
37、agreement between purchaser and manufacturer. An earth terminal is to be provided. A permanent label in accordance 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
38、 carry the required current and not less than 6 mm for brass and not less than 4 mm for phosphor bronze or stainless 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 r
39、ated voltage. Performance curves shall define the allowable operating range as specified by the pump manufacturer. Pumps shall perform free of cavitation under operating conditions. -7- EN 5021 6-7:2002 4.4.1 Hydraulic interchangeability When replacing one pump with another, it is important that flo
40、w velocities in the cooling circuit are not greatly changed. This may be achieved by ensuring that the pump characteristic 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
41、characteristic curve shows flow values within f 10 % or pressure values within f 8 % of another curve chosen as a datum (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 avai
42、lable, pump characteristic curves may be defined as interchangeable if the above condition is met across the actual flow range (see Figure 2). ACTUAL FLOW Figure 2 - Hydraulic interchangeability across an actual flow range EN 5021 6-7:2002 -8- Annex D gives examples of the use of these hydraulic int
43、erchangeability tolerances. It should be noted that hydraulic interchangeability does not ensure electrical or mechanical interchangeability 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 sup
44、ply voltage between 85 % and 110 % of the nominal voltage and within 94 % - 102 % of nominal frequency . Additionally, the pump shall 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 norm
45、al operation in the event of a system disturbance causing temporary loss of supply voltage for a period of up to three seconds followed 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 SI
46、 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 exceed 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 sev
47、en times the rated full load current of the motor subject to the tolerances given in EN 60034-1, as appropriate. 4.6 Noise Sound power 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. Additional
48、ly, the following shall also be included: - CE marking (if applicable); - rated flow (I/s) at 60 OC; - rated pressure, kPa. Other data may be added to the nameplate if required by the purchaser. 4.7.2 Direction of oil flow and rotation The direction of oil flow and the corresponding direction of rot
49、ation shall be indicated in distinctive places with a suitable arrow in a permanent form. -9- EN 5021 6-7:2002 5 Materials The pump casing/enclosure may be manufactured of either cast iron to IS0 185 grade 200 minimum or aluminium alloy to IS0 3522 type AI-Sil2. 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
