1、Power transformer and reactorfittings Part 10: Oil-to-air heat exchangersBS EN 50216-10:2009raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard is the UK implementation of EN 50216-10:2009.The UK
2、 participation in its preparation was entrusted to Technical CommitteePEL/14, Power transformers.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsi
3、ble for its correct application. BSI 2009ISBN 978 0 580 54740 9ICS 29.180BRITISH STANDARDBS EN 50216-10:2009Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 30 Apri
4、l 2009Amendments issued since publicationAmd. No. Date Text affectedEUROPEAN STANDARD EN 50216-10 NORME EUROPENNE EUROPISCHE NORM March 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normun
5、g Central Secretariat: avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50216-10:2009 E ICS 29.180 English version Power transformer and reactor fittings - Part 10: Oil-to-air heat exchanger
6、s Accessoires pour transformateurs de puissance et bobines dinductance - Partie 10: Echangeurs thermiques huile-air Zubehr fr Transformatoren und Drosselspulen - Teil 10: l-Luft-Khler This European Standard was approved by CENELEC on 2008-10-21. CENELEC members are bound to comply with the CEN/CENEL
7、EC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard 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 CE
8、NELEC member. This European Standard exists in three official versions (English, French, German). A version in any other 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 version
9、s. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, S
10、lovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 50216-10:2009EN 50216-10:2009 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 was approved by CENELEC as
11、 EN 50216-10 on 2008-10-21. This European Standard is to be read in conjunction with EN 50216-1:2002, Power transformer and reactor fittings - Part 1: General. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national
12、standard or by endorsement (dop) 2009-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-11-01 _ BS EN 50216-10:2009 3 EN 50216-10:2009 Contents 1 Scope . 4 2 Normative references 4 3 Definitions 4 4 Requirements 5 4.1 Rated values . 5 4.2 Rated
13、 cooling capacity 5 4.3 Mechanical design 6 4.4 Protection of surfaces . 6 5 Designation 7 5.1 Designation of the heat exchangers . 7 5.2 Rating plate information 7 6 Tests . 8 6.1 Routine tests . 8 6.2 Type tests . 8 7 Preparation for transport and storage 8 8 Mounting and service, service conditio
14、ns . 8 Annex A (normative) Design details of heat exchangers 9 Annex B (normative) Performance of heat exchangers 12 Bibliography 16 Figures Figure A.1 Schematic design of cooling unit (without oil pump) Arrangement of flanges A1 . 9 Figure A.2 Versions of flange arrangement . 10 Figure B.1 General
15、diagram for cooling temperatures . 12 Figure B.2 Variation of cooling capacity as function of average oil temperature rise 13 Figure B.3 Variation of cooling capacity as function of air flow quantity . 14 Figure B.4 Variation of cooling capacity as function of oil flow quantity . 15 Tableaux Table A
16、.1 Parts list . 11 BS EN 50216-10:2009EN 50216-10:2009 4 1 Scope EN 50216-10 describes oil-to-air heat exchangers that means a heat exchanger for the cooling of the transformer oil using a forced oil circuit and a forced air circuit. The oil-to-air heat exchangers are not included in the scope of th
17、e Pressure Equipment Directive 97/23/EC according to Article 1, 3.12. This standard establishes essential dimensions and the requirements to ensure interchangeability and adequate mounting of the oil-to-air heat exchangers. 2 Normative references The following referenced documents are indispensable
18、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 amendment) applies. EN 50216-1:2002 Power transformers and reactor fittings - Part 1: General EN 60296 Fluids for electrote
19、chnical applications - Unused mineral insulating oils for transformers and switchgear (IEC 60296) EN 60721-3-4 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 4: Stationary use at non-weatherprotected locations
20、(IEC 60721-3-4) EN 754-2 Aluminium and aluminium alloys - Cold drawn rod/bar and tube - Part 2: Mechanical properties EN 1092-1 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories , PN designated - Part 1: Steel flanges EN 1386 Aluminium and aluminium alloys - Tre
21、ad plate - Specifications EN 10025:1990 1)Hot rolled products of non-alloy structural steels - Technical delivery conditions EN 10130 Cold rolled low carbon steel flat products for cold forming - Technical delivery conditionsEN 10217-1 Welded steel tubes for pressure purposes - Technical delivery co
22、nditions - Part 1: Non-alloy steel tubes with specified room temperature properties EN 12451 Copper and copper alloys - Seamless, round tubes for heat exchangers EN ISO 3506-1 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1) ISO 44
23、06 Hydraulic fluid power - Fluids - Methods for coding the level of contamination by solid particles 3 Definitions For the purposes of this document, the following terms and definitions apply. 3.1 oil header oil collecting and guiding compartment with flange connections to connect the heat exchanger
24、 with the oil circuit of the transformer 3.2 tube sheets tubes are connected at both ends with tube sheets. The connection must be oil tight 3.3 heat exchanger device for exchanging heat from one medium to the other 1)Replaced by EN 10025 series, Hot rolled products of structural steels. BS EN 50216
25、-10:2009 5 EN 50216-10:2009 3.4 cooling unit unit, consisting of heat exchanger, fan with air chamber and oil pump 3.5 turbulators inserts to generate turbulent oil flow 3.6 passes number of passes via heat exchanger. Number “1” means that the oil is streaming in one way without any redirection from
26、 one oil header to the other (oil inlet and outlet in the opposite oil headers) 4 Requirements 4.1 Rated values Values for inquiry (minimum): - rated cooling capacity QrkW - maximum air temperature at inlet t1 C- average oil temperature t2mC - oil temperature difference (min. value/max. value) t2K -
27、 maximum sound power level LwdB(A) - direction of air flow through heat exchanger forced / induced draught - minimum ambient temperature C For the case of order the following rated values should be fixed: - rated cooling capacity QrkW - rated air flow quantity V1m/s- rated oil flow quantity V2m/h -
28、direction of air flow through heat exchanger forced / induced draught - air temperature at inlet t1 C - air temperature at outlet t1 C- oil temperature at inlet t2 C - oil temperature at outlet t2 C- air side pressure drop p1Pa - oil side pressure drop p2kPa - maximum sound power level (without tole
29、rance) LwdB(A) - minimum ambient temperature C 4.2 Rated cooling capacity The rated cooling capacity of the heat exchanger is the minimum capacity, which the manufacturer has to guarantee. It is based on following conditions of heat exchanger at its time of manufacturing. No margin above defined rat
30、ed cooling capacity; additional cooling capacity has to be agreed between purchaser and manufacturer. Unless otherwise agreed between purchaser and manufacturer the calculation of rated cooling capacity must consider dry ambient air at a pressure of pabs= 101,3 kPa and all types of transformer oil a
31、ccording to EN 60296. BS EN 50216-10:2009EN 50216-10:2009 6 Rated air-and oil-flow under consideration of permissible pressure drop. The direction of air through the heat exchanger is forced or induced draught (shall be presented in the printout). The point of operation on the fan characteristic cur
32、ve for nominal air duty shall be at least 15 % below the area of instability. Thereby all resistances for the air flow are considered (heat exchanger, direction changes, protection screen, measures for noise reduction). The difference of at least 15 % is the maximum pressure loss caused by possible
33、air side fouling. Conversion of rated cooling capacity into other operating conditions can be calculated according to Annex B. Changes of flow quantities should generally be co-ordinated with the manufacturer. 4.3 Mechanical design The mechanical design is based on environmental conditions described
34、 in EN 50216-1, Clause 3. The maximum oil temperature is 100 C. Other environmental conditions, temperatures as well as other cooling liquids shall be agreed between manufacturer and purchaser. On their air side the cooling pipes are equipped with cooling fins. The environmental conditions have to b
35、e considered for the choice of the materials and/or the combination of the tubes and cooling fins. Connection between cooling pipes and tube sheets has to be oil tight. Excessive thermal expansion has to be avoided by appropriate design features. The heat exchanger has to be designed for outside mou
36、nting without further protection and without any place to cumulate rain or condense water. For transformers with frequency 50 Hz the resonance frequency of the operable heat exchanger must not be in the range of (80 320) Hz, for transformers with frequency 16 2/3 Hz not in the range of (25 180) Hz.
37、Tolerances are not considered. Vibration of pipes with fins or coil body has to be avoided by an appropriate number of supports. Headers carry flanges for connection to the oil circuit. Types of flanges and fixing have to be agreed. The number of oil side passes is odd for the flange arrangements A1
38、, B1, C1 and even for A2, B2, C2 according to Figure A.2. It must be possible to clean the heat exchanger on the air side by means of water under high pressure. The heat exchanger has to be vacuum proof. For material selection criteria refer to A.4. The maximum permissible oil pressure in service fo
39、r the heat exchanger is limited to 350 kPa. 4.4 Protection of surfaces 4.4.1 Inner surfaces Oil-proof and heat-resistant (min. 100 C 2) protection. 4.4.2 Outer surfaces Pipes and fins protected against corrosion. The joints between tubes and tube sheets must be closed long term flexible and heat res
40、istant up to 100 C 2). The corrosion protection system has to be agreed between manufacturer and purchaser considering the environmental conditions. The environmental conditions must be according to EN 60721-3-4. 2)Deviations in the temperature must be agreed between manufacturer and purchaser. BS E
41、N 50216-10:2009 7 EN 50216-10:2009 5 Designation 5.1 Designation of the heat exchangers The following heat exchangers are differentiated: - OAA oil-to-air heat exchanger with vertical cooling pipes and horizontal air direction - OAB oil-to-air heat exchanger with horizontal cooling pipes and horizon
42、tal air direction - OAC oil-to-air heat exchanger with horizontal cooling pipes and vertical air direction - OAxF fan arrangement is forced-draft type - OAxI fan arrangement is induced-draft type EXAMPLE: Designation of an oil-to-air heat exchanger with vertical cooling pipes, horizontal air directi
43、on of forced draft type, rated cooling capacity 315 kW (315), oil temperature rise 45 K (45), arrangement of flanges C1 according to A.1.2: Oil-to air heat exchanger EN 50216-10OAAF-315/45-C1. 5.2 Rating plate information The rating plate shall carry following data. It has to be observable when the
44、heat exchanger is assembled to the transformer: - manufacturer; - designation according to 5.1; - serial number; - year of manufacturing; - maximum oil pressure at service kPa; - maximum oil temperature C; - minimum ambient temperature C. Rating data: - rated cooling capacity kW; - rated air flow /
45、oil flow quantity m/h; - temperature for air and oil at inlet and outlet C; - pressure drop of oil and air kPa/Pa; - type of tubes 3): - oO oval tube without turbolators, - oR circular tube without turbolators, - mO oval tube with turbolators, - mR circular tube with turbolators; - mass of heat exch
46、anger without oil kg; - oil volume dm. Design of rating plate: - material: consistent against rust and acids. Other designs are possible by special agreement. 3)Select correct type. BS EN 50216-10:2009EN 50216-10:2009 8 6 Tests 6.1 Routine tests 6.1.1 Tightness tests The oil-to-air heat exchanger ha
47、s to be filled with transformer oil with a temperature of (60 5) C and a pressure of 500 kPa. The pressure shall be applied for 6 h, starting after removal of all leaks. At the visual inspection no further leakiness must be recovered. The oil side of the oil-to-air heat exchanger may be submitted to
48、 the following alternative tightness tests by agreement between manufacturer and purchaser: - hydraulic test with transformers oil filled at ambient temperature and a pressure of 500 kPa for 3 h; - pneumatic test with compressed air under water at 500 kPa for 2 h; - for the above period any leakage
49、(by visual inspection) has to be detected. 6.1.2 Visual inspection of the surfaces 6.1.2.1 Outer surfaces Visual the surfaces shall be free of damages, deformations and dirt. Every sort of filling compounds shall not be used. 6.1.2.2 Inner surfaces Visual the surfaces shall be free of damages, deformations and dirt. The heat exchanger shall be flushed on the oil-side with transformer oil via micron filter as long as size and amount of particles is
