30156286 pdf BRITISH STANDARD BS EN 50464 4 2007 Three phase oil immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV — Part 4 Requ[.]
Trang 1BRITISH STANDARD
50464-4:2007
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA
to 2 500 kVA with highest voltage for equipment not
exceeding 36 kV —
Part 4: Requirements and tests concerning pressurised corrugated tanks
ICS 29.180
+A1:2011
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This British Standard is the UK implementation of
EN 50464-4:2007+A1:2011 It supersedes BS EN 50464-4:2007 which
is withdrawn
The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers
A list of organizations represented on this committee can be obtained on request to its secretary
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 cannot confer immunity from legal obligations.
BS EN 50464-4:2007+A1:2011
This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 31 August 2007
© BSI 2011
Amendments/corrigenda issued since publication
Date Comments
additional text in subclause 3.1
ISBN 978 0 580 75264 3
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NORME EUROPÉENNE
EUROPÄISCHE NORM
CENELEC
European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref No EN 50464-4:2007 E
English version
Three-phase oil-immersed distribution transformers
50 Hz, from 50 kVA to 2 500 kVA with highest voltage
for equipment not exceeding 36 kV -Part 4: Requirements and tests concerning
pressurised corrugated tanks
Transformateurs triphasés de distribution
immergés dans l'huile,
50 Hz, de 50 kVA à 2 500 kVA,
de tension la plus élevée
pour le matériel ne dépassant pas 36 kV -
Partie 4: Prescriptions et essais relatifs
aux cuves sous pression
Ölgefüllte Drehstrom-Verteilungstransformatoren
50 Hz, 50 kVA bis 2 500 kVA mit einer höchsten Spannung für Betriebsmittel bis 36 kV - Teil 4: Anforderungen und Prüfungen für druckbeanspruchte Wellwandkessel
This European Standard was approved by CENELEC on 2006-12-01 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-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 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 versions
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, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom
October 2011
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Foreword
The text of the Harmonization Document HD 428.6 S1:2002, prepared by the Technical Committee CENELEC TC 14, Power transformers, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 50464-4 on 2006-12-01
The following date was 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) 2007-12-01 The EN 50464 series consists of the following parts, under the general title “Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not
exceeding 36 kV”:
Part 1 General requirements
Part 2-1 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – General requirements Part 2-2 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – Cable boxes type 1 for use on distribution transformers meeting the requirements of EN 50464-2-1
Part 2-3 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – Cable boxes type 2 for use on distribution transformers meeting the requirements of EN 50464-2-1
Part 3 Determination of the power rating of a transformer loaded with non-sinusoidal
currents Part 4 Requirements and tests concerning pressurised corrugated tanks
This document (EN 50464-4:2007/A1:2011) has been prepared by the CLC/TC 14, "Power transformers"
The following dates are fixed:
• latest date by which the document h
as to be implemented at national level by publication of an identical national
standard or by endorsement
(dop) 2012-10-10
• latest date by which the national
standards conflicting with the document have to be withdrawn
(dow) 2014-10-10
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights
Foreword to amendment A1
BS EN 50464-4:2007+A1:2011
EN 50464-4:2007+A1:2011 (E)
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Content
1 Scope 4
2 Normative references 4
3 General conditions 4
3.1 Temperature variation 4
3.2 Sealing temperature 4
3.3 Calculation of the volume variation 4
4 Test procedure 4
4.1 General 4
4.2 Measurement of pressure range 4
4.3 Endurance test 5
4.4 Leakage test 5
4.5 Evaluation of the tests 5
EN 50464-4:2007+A1:2011 (E)
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1 Scope
This Part 4 of EN 50464 series is applicable to test procedures to verify the mechanical withstand capability of the corrugated tanks of completely oil filled and hermetically sealed distribution transformers
NOTE Variations of oil temperature due to variations of ambient temperature and loading, result in deformation of tank walls
2 Normative references
For the purposes of this document, the normative references of EN 50464-1 apply
3 General conditions
3.1 Temperature variation
For the simulation of the seasonal and daily temperature variations, the average oil temperature is
assumed to vary between -25 °C (minimum ambient temperature with disconnected transformer) and +88 °C (the sum of maximum ambient temperature +40 °C and maximum allowed average oil
temperature rise: 0,8 x 60 K = 48 K)
3.2 Sealing temperature
When sealing the tank, the average oil temperature shall be chosen between 15 °C and 35 °C and recorded A manometer connected to the tank cover shall register the value zero
3.3 Calculation of the volume variation
From the temperature variations above, the oil volume change from the relaxed stage at the sealing temperature shall be calculated using a volume expansion coefficient of 0,000 75 K-1 (for mineral oil)
4 Test procedure
4.1 General
These tests are considered as special tests
These tests shall be carried out (in the sequence from 4.2 to 4.4) on a tank which is considered as
representative of a range of tanks by agreement between purchaser and supplier
4.2 Measurement of pressure range
The increase or decrease of the oil volume as calculated in 3.3 shall be added to or extracted from the relaxed tank, and the corresponding overpressure (P+) and underpressure (P-) shall be registered by a manometer connected to the tank cover
The oil temperature during the measurement shall be the same value as used for sealing ± 3 °C
(see 3.2)
By agreement between manufacturer and purchaser the maximum temperature used for the
endurance test shall be 40 °C plus 0,8 times the oil temperature rise determined by the
temperature rise test
BS EN 50464-4:2007+A1:2011
EN 50464-4:2007+A1:2011 (E)
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4.3 Endurance test
To simulate the volume expansion, the tank shall be subjected to 2 000 cycles with overpressure and underpressure Each cycle comprises one overpressure and one underpressure To achieve the overpressure and underpressure, the volume of oil calculated in 3.3 shall be added to and extracted from the tank in the quantity calculated in 3.3 The pressure P+ and P- shall be recorded during the test
at intervals
The reading of the manometer with the tank relaxed shall be recorded before (P0) and after the test (P1) and the tank shall be topped up with oil to reach the initial relaxing pressure P0 If requested for the test evaluation, the added volume shall be recorded
NOTE 1 To avoid mechanical impulses, the test duration should not be too short A minimum cycle duration of 120 s may be sufficient.
NOTE 2 A pause in the test procedure does not affect the test result
4.4 Leakage test
After the endurance test, the same tank shall be subjected to a 24 h static leakage test with an overpressure 1,2 times the value recorded during the measurement (see 4.2)
4.5 Evaluation of the tests
After 4.4, the following events shall be observed:
– the tank shall not show leakages as observed by appropriate detecting means;
– no cracks shall occur in the tank;
– heavy and unexplained discrepancies on the pressure readings taken before, during and after the tests under 4.2 and 4.3, have to be considered as possible indexes of abnormal events;
– by agreement between manufacturer and purchaser, a limit for the volume of oil to be added at the end of the test may be specified for checking the permanent deformations of the tank
EN 50464-4:2007+A1:2011 (E)
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BS EN
50464-4:2007
+A1:2011