BRITISH STANDARD BS EN 50216 5 2002 Incorporating Amendments Nos 1, 2 and 3 Power transformer and reactor fittings — Part 5 Liquid level, pressure and flow indicators, pressure relief devices and dehy[.]
Trang 1Incorporating Amendments Nos 1, 2 and 3
Power transformer and
reactor fittings —
Part 5: Liquid level, pressure and flow
indicators, pressure relief devices and
dehydrating breathers
The European Standard EN 50216-5:2002, with the incorporation of
amendments A1:2002, A2:2005 and A3:2006, has the status of a
British Standard
ICS 29.180
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Trang 2This 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
12 April 2002
© BSI 2006
ISBN 0 580 39502 2
National foreword
This British Standard was published by BSI It is the UK implementation of
EN 50216-5:2002, incorporating amendments A1:2002, A2:2005 and A3:2006 The start and finish of text introduced or altered by amendment is indicated in the text by tags !" Tags indicating changes to CENELEC text carry the number of the CENELEC amendment For example, text altered by CENELEC amandment A1 is indicated in the text by !".
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 of itself confer immunity from legal obligations.
Amendments issued since publication
Trang 3January 2002
December 2002
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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members
Ref No EN 50216-5:2002
ICS 29.180
English version
Power transformer and reactor fittings Part 5: Liquid level, pressure and flow indicators, pressure relief devices
and dehydrating breathers
Accessoires pour transformateurs de
puissance et bobines d'inductance
Partie 5: Indicateurs de niveau
de liquide isolant, manomètres et
indicateurs de circulation de liquide
isolant, limiteurs de pression et
assécheurs d'air
Zubehör für Transformatoren und Drosselspulen
Teil 5: Flüssigkeitsstandanzeiger, Druckanzeigeeinrichtungen und Durchflussmesser,
Druckentlastungsventile und Luftentfeuchter
This European Standard was approved by CENELEC on 2001-09-25 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom
October 2006
+A3
Trang 4Foreword
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
EN 50216 5 on 2001 09-2-25
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
- latest date by which the national standards conflicting
EN EN 50216 5 is to be read in conjunction with EN EN 50216 1
Foreword to amendment A1
This amendment was prepared by the Technical Committee CENELEC TC 14, Power transformers
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50216-5:2002 on 2002-11-01
The following dates were fixed:
- latest date by which the amendment has to be implemented
at national level by publication of an identical
- latest date by which the national standards conflicting
Foreword to amendment A2
This amendment to the European Standard EN 50216-5:2002 was prepared by the Technical Committee CENELEC TC 14, Power transformers
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A2 to EN 50216-5:2002 on 2004-12-01
The following dates were fixed:
- latest date by which the amendment has to be implemented
at national level by publication of an identical
- latest date by which the national standards conflicting
EN 50216-5:2002 as well as this amendment are to be read in conjunction with
EN 50216-1:2002
Trang 5Foreword to amendment A3
This amendment to the European Standard EN 50216-5:2002 was prepared by the Technical Committee CENELEC TC 14, Power transformers
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A3 to EN 50216-5:2002 on 2006-09-01
This amendment supersedes EN 50216-5:2002/A1:2002
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
– latest date by which the national standards conflicting
Trang 6
Contents
Page
1 Scope 5
2 Normative references 5
3 Direct reading dial type liquid level indicators 5
3.1 General 5
3.2 Electrical characteristics of switch 6
3.3 Tests 6
4 Liquid pressure gauges - Differential pressure gauges 7
4.1 General 7
4.2 Electrical characteristics of switch 7
4.3 Tests 8
5 Liquid flow indicators 8
5.1 General 8
5.2 Electrical characteristics of switch 9
5.3 Tests 10
6 Pressure relief devices 10
6.1 General 10
6.2 Operating limits
6.3 Dimensions
6.4 Operating performance 13
6.5 Manufacturing features 13
6.6 Tests 14
7 Dehydrating breathers 1 4 7.1 General 14
7.2 Selection criteria 15
7.3 Fixing arrangement and overall dimensions 15
7.4 Breather components 16
7.5 Requirements 17
7.6 Mounting arrangement 17
7.7 Tests 17
10 10
Trang 71 Scope
Addition to EN 50216-1:
EN 60947-5-1 1997 Low-voltage switchgear and controlgear - Part 5-1: Control circuits + A12 1999 devices and switching elements - Electromechanical control circuit devices (IEC 60947-5-1:1997)
3 Direct reading dial type liquid level indicators
3.1 General
Where the conservator for transformer tanks or other separated expansion chambers are required to be provided with a liquid level indicator of the direct reading dial type, it shall comply with the following:
- In case of electric alarm contacts, a terminal box shall be provided with one earth terminal
- The terminals shall allow for connection of cables having a cross section area of 1,5 mm2 to
4 mm²
- The thread for the cable glands should be either Pg 16 or M20 x 1,5 to be agreed between supplier and purchaser
- The liquid level indicator shall be fitted with a solid float operating on the displacement principle (hollow floats are not permitted) There shall be no direct mechanical contact between the float mechanism and the dial indicator
- The liquid level indicator shall withstand seismic and operational vibrations and environmental conditions in accordance with EN 50216-1
- Unless otherwise agreed, the liquid level at 20 °C and the minimum and the maximum level shall be indelibly and clearly marked
- The movement of the pointer form the minimum to the maximum level shall be clockwise when facing the dial
- The mounting arrangement of the indicator shall be such that it can be dismantled and removed from the outside of the conservator It shall be possible to remove the dial, maintain
or replace switches, without emptying the conservator
- The marking of the dial plate shall be indelible
3.2 Electrical characteristics of switch
This device is based on EN 60947-5-1
#EN 50216-5 specifies the liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers for power transformer and reactor fittings
Except where otherwise specified or implied herein the above fittings shall comply with the requirements of EN 50216-1.$
Trang 83.2.1 General
The purchaser shall specify whether the switch shall have normally open, normally closed or change over contacts Unless otherwise specified, the supplier shall provide switches with change over contacts
The switch shall be able to operate at between maximum 5 % and minimum 95 % of the pointer deflection range
3.2.2 Currents
The rated current shall be 2 A r.m.s and the short time current 10 A r.m.s for 30 ms
Other values may be agreed between purchaser and supplier
3.2.3 Breaking and making capacity
3.3 Tests
3.3.1 Routine tests
3.3.1.1 Leakage test
The devices shall be subjected to an oil leakage test using one of the three following methods,
at the choice of the supplier:
- application of a gas pressure of 2,5 × 105 Pa for 2 min at ambient temperature;
- application of a pressure of 1 × 105 Pa for 30 min to the relay filled with oil at a liquid temperature of 90 °C;
- application of a pressure of 1,4 × 105 Pa for 6 h to the relay filled with oil at ambient temperature
The relay shall not leak
3.3.1.2 Applied voltage test
The test shall be carried out in accordance with Table 1 of EN 50216-1
Table 1 – Breaking and making capacity (NO and NC contacts) Voltage Uninterrupted current
(making capacity) (breaking capacity) Interrupted current
Other values may be agreed between purchaser and supplier
The minimum contact life shall be 1 000 operations
Only in case that the device has to operate in a system at 24 V d.c and making capacity up to 0,5 VA, the switches shall be able to make a low current down to 10 mA even after one year of non-operation
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Trang 93.3.1.3 Functional test
A functional test shall be carried out to prove the mechanical and electrical operation of the indicator and associated switches
3.3.2 Type test
The devices shall be subjected to a vacuum test of an absolute pressure of 2,5 kPa for 24 h This test shall be followed by the test as detailed in 3.3.1.1 above
4 Liquid pressure gauges - Differential pressure gauges
4.1 General
Liquid pressure and differential pressure gauges shall be of the dial type Liquid pressure gauges shall incorporate a screwed connection threaded G3/8 and differential pressure gauges shall incorporate two pipework unions threaded G3/8, for connection to the liquid and water circuits as appropriate Diameters G3/4 and G1/2 may be also be used if required
Liquid pressure gauges shall be scaled (0 - 2,5) × 105 Pa For some water pressures, 2,5 × 105 Pa may be increased accordingly
Differential pressure gauges shall be scaled (2 - 0 - 2) × 105 Pa The nominal setting for the electrical switches shall be when the liquid pressure in the cooler outlet does not exceed the water inlet pressure by at least 20 000 Pa Any deviation from these parameters shall be subject to agreement between purchaser and supplier
The marking of the dial plate shall be indelible The maker’s name or trade mark, grades and type shall be given
In the case of liquid pressure gauges, the error in pressure indication, for either increasing or decreasing pressure, shall not exceed 1 % of the maximum scale value at any point between
10 % to 90 % for the maximum scale value
Other values can be acceptable by agreement between purchaser and supplier
Unless otherwise specified, all gauges shall be mounted and calibrated in the upright (vertically mounted) position
4.2 Electrical characteristics of switch
This device is based on EN 60947-5-1
4.2.1 General
The purchaser shall specify whether the switch shall have normally open, normally closed or change over contacts Unless otherwise specified, the supplier shall provide switches with change over contacts
The switches shall be able to operate at between maximum 5 % and minimum 95 % of the pointer deflection range
4.2.2 Rated current
The rated current shall be 2 A r.m.s and the short time current 10 A r.m.s for 30 ms
Other values may be agreed between purchaser and supplier
Trang 104.2.3 Breaking and making capacity
4.3 Tests
4.3.1 Routine tests
4.3.1.1 Pressure test
The gauges, ready for operation, filled with liquid, shall be subjected to an over pressure 1,1 times higher than the maximum scaled level for 6 h at ambient temperature
4.3.1.2 Applied voltage test
The test shall be carried out in accordance with Table 1 of EN 50216-1
4.3.1.3 Functional test
A functional test shall be carried out to prove the mechanical and electrical operation of the indicator and associated switches
4.3.2 Type test
The devices shall be subjected to a vacuum test of an absolute pressure of 2,5 kPa for 24 h This test shall be followed by the test as detailed in 4.3.1.1 above
5 Liquid flow indicators
5.1 General
A terminal box shall be provided with one earth terminal
The terminals shall allow for connection of cables having a cross section area of 1,5 mm² to
4 mm²
The thread for the cable glands should be either Pg 16 or M20 x 1,5 to be agreed between supplier and purchaser
The design of the indicators and the components contained therein and the mounting and pipework connecting arrangements shall be such that they will not sustain damage during service or maloperate due to vibration under service conditions according to 3.1 of EN 50216-1 There shall be no direct contact between the liquid in the body of the equipment and the dial indicator scales of the oil flow indicators
Table 2 – Breaking and making capacity (NO and NC contacts) Voltage Uninterrupted current
(making capacity) (breaking capacity) Interrupted current
Other values may be agreed between purchaser and supplier
The minimum contact life shall be 1 000 operations
Only in case that the device has to operate in a system at 24 V d.c and making capacity up to 0,5 VA, the switches shall be able to make a low current down to 10 mA even after one year of non-operation
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Trang 11The indicator shall incorporate one set of electrical contacts which operate when there is no flow of liquid Other set of contacts shall be provided if required
If required, the liquid flow indicator housing shall include, at its lowest point, a liquid draining plug having a flanged external head
A minimum of two positions (no flow/maximum flow) for liquid flow indication shall be provided The marking of the dial plate shall be indelible The maker’s name or trade mark of the indicator shall be given
The supplier shall give the direction of liquid flow depending on the mounting position
A reverse flow of liquid shall give no flow indication
The supplier shall indicate the minimum liquid flow for a trouble free of contacts
5.2 Electrical characteristics of switch
This device is based on EN 60947-5-1
5.2.1 General
The purchaser shall specify whether the switch shall have normally open, normally closed or change over contacts Unless otherwise specified, the supplier shall provide switches with change over contacts
The switch shall be able to operate at between maximum 5 % and minimum 95 % of the pointer deflection range
5.2.2 Rated current
The rated current shall be 2 A r.m.s and the short time current 10 A r.m.s for 30 ms
Other values may be agreed between purchaser and supplier
5.2.3 Breaking and making capacity
Table 3 - Breaking capacity Voltage Current Breaking capacity
Other values may be agreed between purchaser and supplier
The minimum contact life shall be 100 000 operations
The switch shall be able to make on a current down to 10 mA for any value of voltage defined in Table 3 even after one year of non-operation
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