EN 50216-5:2002/A2:2005

SLOVENSKI SIST EN 50216-5:2002/A2:2006

STANDARD
januar 2006
Pribor za močnostne transformatorje in dušilke – 5. del: Kazala nivoja
tekočine, tlačne naprave in kazala pretoka
(istoveten EN 50216-5:2002/A2:2005)
Power transformer and reactor fittings - Part 5: Liquid level, pressure and flow
indicators, pressure relief devices and dehydrating breathers
ICS 29.180 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 50216-5/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2005
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 Zubehör für Transformatoren und
puissance et bobines d'inductance Drosselspulen
Partie 5: Indicateurs de niveau Teil 5: Flüssigkeitsstandanzeiger,
de liquide isolant, manomètres et Druckanzeigeeinrichtungen und
indicateurs de circulation de liquide Durchflussmesser,
isolant, limiteurs de pression et Druckentlastungsventile und
assécheurs d'air Luftentfeuchter

This amendment A2 modifies the European Standard EN 50216-5:2002; it was approved by CENELEC
on 2004-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this amendment 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 amendment 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.

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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50216-5:2002/A2:2005 E

Foreword
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.
EN 50216-5:2002 as well as this amendment are to be read in conjunction with EN 50216-1:2002.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-12-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2007-12-01
__________
- 3 - EN 50216-5:2002/A2:2005
Replace the title of the EN by:
Power transformer and reactor fittings
Part 5: Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers
1 Scope
Replace the text by:
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.
Add the following clauses:
6 Pressure relief devices
6.1 General
Pressure relief device, for use in liquid immersed transformer and reactor tanks, in order to release the
excess of internal pressure due to fault, so co-operating to the integrity of the tank.
6.2 Operating limits
The device shall be capable to be installed on the tank cover and walls, in each position or any inclination,
without alteration of its operating performance.
It is possible to mount more than one device on each transformer.
6.3 Dimensions
6.3.1 Flanged connection design
The fixing flange sizes are based on ND, which is the diameter of the opening hole in the tank.
Tables 4, 5 and 6 are based on the Figures 1, 2 and 3 respectively.
Table 4 – Fixing interface dimensions according to Figure 1
Holes
Dimensions flange
Size
D1 (max) D2 D3 A
Number
mm mm mm mm
A – ND 50 mm 170 125 18 14 4
B – ND 80 mm 200 160 18 16 4
C – ND 125 mm 280 210 18 16 8
D – ND 150 mm 285 240 18 16 8
E – ND 200 mm 350 295 22 18 8
F – ND 150 mm 290 235 16 13 6
G – ND 125 mm 280 235 16 13 6
NOTE The flange can also be square.

Figure 1 – Flange interface
Figure 2 – Maximum overall dimensions

- 5 - EN 50216-5:2002/A2:2005
Table 5 – Overall dimensions according to Figure 2

Max dimensions without oil spray protection and accessories
Size mm
D7 (max) HE (max) HI (max)
mm mm mm
A – ND 50 mm 200 150 80
B – ND 80 mm 250 200 150
C – ND 125 mm 300 300 180
D – ND 150 mm 360 300 180
E – ND 200 mm 400 400 250
F – ND 150 mm 300 300 180
G – ND 125 mm 300 300 180
6.3.2 Threaded connection design
Table 6 – Fixing interface and overall dimensions according to Figure 3
Max overall dimensions Threaded connection
Size
D1 HE HI D2
mm mm mm mm
ISO 228
1 60 40 40 1”
2 80 40 40 2”
Figure 3 – Mounting interface and general overall dimensions

6.4 Operating performance
Nominal operating pressure: the pre-fixed overpressure value shall be agreed between supplier and
purchaser within the standard range from 20 kPa up to 90 kPa, with 10 kPa steps, with a tolerance of – 5 kPa
to + 7 kPa.
Nominal operating pressure above the standard range (> 90 kPa) shall be agreed between supplier and
purchaser.
The device shall be capable to reclose when the overpressure is terminated.
The maximum pressure without any oil leakage is equal to the nominal operating pressure less 10 kPa.
6.5 Manufacturing features
6.5.1 Devices according to Figure 1 and Figure 2
Flanged design, typically used on power transformers and reactors.
6.5.1.1 Description
The device is composed of a flanged body and a spring loaded shutter; design can be “spring out of tank" or
“spring inside tank”.
It can be fit, upon request, with
• oil spray protection,
• visual indicator of operation with manual reset,
• one or more electric contacts.
The characteristics of the electric contacts shall be according to Table 7.
Table 7 – Electric contact characteristics
Rated voltage Current Breaking capacity
24-220 V d.c. 2 A 250 W L/R < 40 ms
230 V a.c. 2 A 400 VA cos ϕ > 0,5
Other values may be agreed between purchaser and
...