SIST EN ISO 5826:2014

Resistance welding equipment - Transformers - General specifications applicable to all transformers (ISO 5826:2014)

EN-ISO 5826 gives specifications applicable to all transformers for resistance welding equipment with or without connected rectifier. The following types are included: - single-phase transformers for alternating welding current, typically operating at 50 Hz or 60 Hz; - single-phase transformers with connected rectifier typically operating at 50 Hz or 60 Hz; - single-phase inverter welding transformer with connected rectifier typically operating at 400 Hz to 2 kHz; - three-phase transformers with connected rectifier typically operating at 50 Hz or 60 Hz. For the purposes of this International Standard, a transformer can refer to the transformer alone or combined with other components such as a rectifier, as listed above. This International Standard applies to transformers built to protection class I or II according to IEC 61140.

Widerstandsschweißeinrichtungen - Transformatoren - Allgemeine Anforderungen anwendbar für alle Transformatoren (ISO 5826:2014)

Diese Internationale Norm enthält Spezifikationen, die für alle Transformatoren für Widerstandsschweißein-richtungen mit oder ohne angeschlossenen Gleichrichter anwendbar sind.
Diese umfassen folgende Arten:
-   einphasige Transformatoren mit Wechsel-Schweißstrom, üblicherweise bei 50 Hz oder 60 Hz betrieben;
-   einphasige Transformatoren mit angeschlossenem Gleichrichter, üblicherweise bei 50 Hz oder 60 Hz betrieben;
-   einphasiger Inverter-Schweißtransformator mit angeschlossenem Gleichrichter, üblicherweise bei 60 Hz bis 2 kHz betrieben;
-   dreiphasige Transformatoren mit angeschlossenem Gleichrichter, üblicherweise bei 50 Hz oder 60 Hz betrieben;
-   dreiphasiger niederfrequenter Umrichter, üblicherweise bei 5 Hz bis 16 Hz betrieben.
ANMERKUNG 1   Typische Betriebsfrequenzen sind nur zur Information angegeben und gelten nicht ausschließlich.
Für die Anwendung dieser Internationalen Norm kann sich ein Transformator auf einen einzelnen Transformator oder auf einen Transformator zusammen mit anderen Komponenten, z. B. Gleichrichter, wie oben aufgeführt beziehen.
Diese Internationale Norm gilt für Transformatoren, die nach Schutzklasse I oder II entsprechend IEC 61140 gebaut wurden.
ANMERKUNG 2   Diese Internationale Norm liefert grundlegende Anforderungen, die durch andere Normen für Wider¬standsschweiß-Transformatoren ersetzt werden können, z. B. ISO 22829 und ISO 10656.

Matériel de soudage par résistance - Transformateurs - Spécifications générales applicables à tous les transformateurs (ISO 5826:2014)

ISO 5826:2014 donne les spécifications applicables aux types de transformateur suivants utilisés pour le matériel de soudage par résistance avec ou sans redresseur: transformateurs monophasés pour courant alternatif de soudage, fonctionnant généralement à 50 Hz ou 60 Hz; transformateurs monophasés avec redresseur pour courant continu de soudage fonctionnant généralement à 50 Hz ou 60 Hz; transformateurs à onduleur monophasés avec redresseur pour courant continu de soudage fonctionnant généralement de 400 Hz à 2 kHz; transformateurs triphasés avec redresseur pour courant continu de soudage fonctionnant généralement à 50 Hz ou 60 Hz.

Oprema za uporovno varjenje - Transformatorji - Splošne specifikacije, veljavne za vse transformatorje (ISO 5826:2014)

Standard EN-ISO 5826 določa specifikacije, ki se uporabljajo za vse transformatorje za opremo za uporovno varjenje s priključenim usmernikom ali brez. Vključene so naslednje vrste: – enofazni transformatorji za izmenični varilni tok, ki običajno obratujejo pri frekvenci 50 ali 60 Hz; – enofazni transformatorji s priključenim usmernikom, ki običajno obratujejo pri frekvenci 50 ali 60 Hz; – enofazni inverterski varilni transformator s priključenim usmernikom, ki običajno obratuje pri frekvenci 400 Hz do 2 kHz; – trifazni transformatorji s priključenim usmernikom, ki običajno obratujejo pri frekvenci 50 ali 60 Hz. Za namene tega mednarodnega standarda izraz transformator označuje samo transformator ali transformator v kombinaciji z drugimi komponentami, kot je zgoraj omenjeni usmernik. Ta mednarodni standard se v skladu s standardom IEC 61140 uporablja za vse transformatorje zaščitnega razreda I ali II.

General Information

• Status: Published
• Public Enquiry End Date: 31-Dec-2013
• Publication Date: 30-Mar-2014
• ICS: 25.160.30 - Welding equipment
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: VAR - Welding
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Mar-2014
• Due Date: 19-May-2014
• Completion Date: 31-Mar-2014
• Ref Project: EN ISO 5826:2014 - Resistance welding equipment - Transformers - General specifications applicable to all transformers (ISO 5826:2014)

Relations

• Replaces: SIST EN ISO 5826:2003 - Resistance welding equipment - Transformers - General specifications applicable to all transformers (ISO 5826:1999)
• Effective Date: 01-May-2014

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 5826:2014
01-maj-2014
1DGRPHãþD
SIST EN ISO 5826:2003
Oprema za uporovno varjenje - Transformatorji - Splošne specifikacije, veljavne za
vse transformatorje (ISO 5826:2014)
Resistance welding equipment - Transformers - General specifications applicable to all
transformers (ISO 5826:2014)
Widerstandsschweißeinrichtungen - Transformatoren - Allgemeine Anforderungen
anwendbar für alle Transformatoren (ISO 5826:2014)
Matériel de soudage par résistance - Transformateurs - Spécifications générales
applicables à tous les transformateurs (ISO 5826:2014)
Ta slovenski standard je istoveten z: EN ISO 5826:2014
ICS:
25.160.30 Varilna oprema Welding equipment
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN ISO 5826:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 5826:2014

---------------------- Page: 2 ----------------------

SIST EN ISO 5826:2014

EUROPEAN STANDARD
EN ISO 5826

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2014
ICS 25.160.30; 29.180 Supersedes EN ISO 5826:2003
English Version
Resistance welding equipment - Transformers - General
specifications applicable to all transformers (ISO 5826:2014)
Matériel de soudage par résistance - Transformateurs - Widerstandsschweißeinrichtungen - Transformatoren -
Spécifications générales applicables à tous les Allgemeine Anforderungen anwendbar für alle
transformateurs (ISO 5826:2014) Transformatoren (ISO 5826:2014)
This European Standard was approved by CEN on 3 February 2014.

CEN 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 CEN-CENELEC Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5826:2014 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN ISO 5826:2014
EN ISO 5826:2014 (E)
Contents Page
Foreword .3
2

---------------------- Page: 4 ----------------------

SIST EN ISO 5826:2014
EN ISO 5826:2014 (E)
Foreword
This document (EN ISO 5826:2014) has been prepared by Technical Committee ISO/TC 44 “Welding and
allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2014, and conflicting national standards shall be withdrawn at
the latest by August 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5826:2003.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5826:2014 has been approved by CEN as EN ISO 5826:2014 without any modification.


3

---------------------- Page: 5 ----------------------

SIST EN ISO 5826:2014

---------------------- Page: 6 ----------------------

SIST EN ISO 5826:2014
INTERNATIONAL ISO
STANDARD 5826
Third edition
2014-02-15
Resistance welding equipment —
Transformers — General
specifications applicable to all
transformers
Matériel de soudage par résistance — Transformateurs —
Spécifications générales applicables à tous les transformateurs
Reference number
ISO 5826:2014(E)
©
ISO 2014

---------------------- Page: 7 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

---------------------- Page: 8 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 3
5 Construction, additional equipment. 4
5.1 Thermal protection . 4
5.2 Output current sensing coil . 4
6 Physical environment and operating conditions . 5
6.1 General . 5
6.2 Ambient air temperature . 5
6.3 Humidity . 5
6.4 Altitude . 5
6.5 Transportation and storage . 5
6.6 Provisions for handling . 5
6.7 Cooling liquid temperature . 6
7 Tests . 6
7.1 Test conditions . 6
7.2 Type tests . 6
7.3 Routine tests . 7
8 Protection against electric shock . 7
8.1 Insulation resistance . 7
8.2 Dielectric strength. 7
8.3 Calibration of output current sensing coil . 8
8.4 Protection against electric shock in normal service (direct contact) . 9
8.5 Protection against electric shock in case of fault condition (indirect contact) . 9
8.6 Class II transformer insulation requirements . 9
9 Thermal rating . 9
9.1 General . 9
9.2 Limits of temperature rise .10
9.3 Heating test conditions .11
9.4 Methods of temperature measurements .13
10 Rated output voltage .15
10.1 General .15
10.2 a.c. no-load voltage (U ) .15
20
10.3 d.c. no-load voltage (U ) .15
2d
11 No-load input current (I ) .15
10
11.1 General .15
11.2 Measurement procedure .16
12 Short-circuit voltage (U ) .16
cc
13 Output current under load condition .16
14 Cooling liquid circuit .17
15 Dynamic behaviour .17
16 Rating plate .17
16.1 General .17
16.2 Description .18
17 Instruction manual .20
© ISO 2014 – All rights reserved iii

---------------------- Page: 9 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

Annex A (informative) Example of a rating plate .21
Annex B (normative) Corrections for higher altitudes and cooling medium temperatures .22
Annex C (informative) Notes on physical concepts and comments on some definitions .23
Annex D (informative) Type code for single-phase transformers for alternating welding current 29
Bibliography .30
iv © ISO 2014 – All rights reserved

---------------------- Page: 10 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 44, Welding and allied processes, Subcommittee
SC 6, Resistance welding and allied mechanical joining.
This third edition cancels and replaces the second edition (ISO 5826:1999), which has been technically
revised.
Requests for official interpretations of any aspect of this standard should be directed to the Secretariat
of ISO/TC 44/SC 6 via your national standards body, a complete listing of which can be found at www.
iso.org.
© ISO 2014 – All rights reserved v

---------------------- Page: 11 ----------------------

SIST EN ISO 5826:2014

---------------------- Page: 12 ----------------------

SIST EN ISO 5826:2014
INTERNATIONAL STANDARD ISO 5826:2014(E)
Resistance welding equipment — Transformers — General
specifications applicable to all transformers
1 Scope
This International Standard gives specifications applicable to the following types of transformers for
use in resistance welding equipment:
— single-phase transformers for a.c. welding, typically operating at 50 Hz or 60 Hz;
— single-phase transformers with connected rectifier for d.c. welding, typically operating at 50 Hz or
60 Hz;
— single-phase inverter transformers with connected rectifier for d.c. welding, typically operating at
400 Hz to 2 kHz;
— three-phase transformers with connected rectifier for d.c. welding, typically operating at 50 Hz or
60 Hz.
For the purposes of this International Standard, the term transformer can refer to the transformer alone
or with connected rectifier (transformer-rectifier unit).
This International Standard applies to transformers built to protection class I or II according to IEC 61140.
NOTE The requirements of this International Standard can be supplemented by other resistance welding
transformer standards, e.g. ISO 22829 and ISO 10656.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 669, Resistance welding — Resistance welding equipment — Mechanical and electrical requirements
IEC 60085, Electrical insulation — Thermal evaluation and designation
IEC 60529, Degrees of protection provided by enclosures (IP code)
IEC 61140, Protection against electric shock — Common aspects for installation and equipment
ISO 17657-3, Resistance welding — Welding current measurement for resistance welding — Part 3: Current
sensing coil
ISO 17657-4, Resistance welding — Welding current measurement for resistance welding — Part 4:
Calibration system
ISO 17677-1, Resistance welding — Vocabulary — Part 1: Spot, projection and seam welding
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17677-1 and ISO 669, and the
following apply.
© ISO 2014 – All rights reserved 1

---------------------- Page: 13 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

3.1
transformer-rectifier unit
transformer with connected rectifier
transformer incorporating a full-wave rectifier in its output circuit
3.2
input voltage
U
1
RMS value of the voltage applied to the primary terminals of the transformer
3.3
rated supply voltage
U
1N
RMS value of the supply voltage (applied to the input terminals) for which the transformer is constructed
Note 1 to entry: This voltage can be different from the mains voltage.
3.4
d.c. no load voltage
U
2d
for transformers, RMS value of the voltage at the output when a load resistance is connected across the
output terminals
3.5
input current
I
1
RMS value of the current at the input terminals of the transformer
3.6
output current
I
2
RMS value of the current at the output terminals of the transformer
3.7
output current at a given duty factor
I
2X
RMS value of the current at the output terminals of the transformer at a duty factor, X
3.8
no-load input current
I
10
RMS value of the current at the input terminals of the transformer with open circuit output terminals
3.9
permanent input current
I , I
1p Lp
maximum rated value of the current at the input terminals corresponding to the permanent output
current
Note 1 to entry: The relationship between input and output currents depends on the type of transformer.
Note 2 to entry: I is used for single-phase transformers; I is used for three-phase transformers.
1p Lp
2 © ISO 2014 – All rights reserved

---------------------- Page: 14 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

3.10
permanent output current
I
2p
highest output current on all settings of the regulator, for continuous operation (100 % duty factor)
[SOURCE: ISO 669]
Note 1 to entry: The permanent output current is a standardized parameter that is used for comparison and
characterization between different transformers. The value of the permanent output current is dependent on the
test conditions as described in this standard.
3.11
output current under load condition
I
2R
instantaneous RMS value of the output current delivered by the transformer with a load resistance, R
3.12
rated permanent apparent input power
S
1p
rated permanent apparent power calculated by U × I
1N 1p
Note 1 to entry: Welding equipment permanent power, S , determined in accordance with ISO 669, may be different
p
from its welding transformer rated permanent apparent input power, S .
1p
4 Symbols and abbreviated terms
The symbols used in this International Standard are listed in Table 1.
Table 1 — Symbols
Symbol Description Used in [section]
I input current 3.5, 9.3
1
I no-load input current 3.8, Clause 11
10
I rated permanent input current (single-phase transformers) 3.9, 9.1, Clause 12
1p
I rated permanent input current (three-phase transformers) 3.9, 9.1
Lp
I output current 3.6, 9.3, Annex C
2
I permanent output current at 100 % duty factor 3.10, 9.1, 9.3, 16.2, Annex C
2p
I output current on load condition 3.11, Clause 13
2R
I output current at a given duty factor 3.7, Annex C
2X
m mass 16.2
S input power at a given duty factor Annex C
X
S rated permanent apparent input power 3.12, 9.1, 16.2, Annex C
1p
Q rated cooling liquid flow Clause 14, 16.2
R initial resistance of a winding 9.3.5, 9.4.3
1
R resistance of a winding at end of heating test 9.4.3
2
T Time Annex C
t on-load time Annex C
1
T cycle time Annex C
U input voltage 3.2, Clause 13
1
U rated short-circuit voltage Clause 12, Annex C
cc
U input short-circuit voltage Clause 12
1cc
© ISO 2014 – All rights reserved 3

---------------------- Page: 15 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

Table 1 (continued)
Symbol Description Used in [section]
U rated supply voltage 3.3, 9.1, 9.3, 10.2, 10.3, Clauses
1N
11, 13, 16.2, Annex C
U a.c. no-load voltage 10.1, 10.2, 16.2
20
U d.c. no-load voltage 3.4, 10.1, 10.3, 16.2
2d
X duty factor 9.3, Annex C
X duty factor of magnetic circuit Annex C
m
Z total impedance referred to output Clauses 12 and 17
2
Δ pressure drop of cooling liquid circuit Clause 14, 16.2
p
Δθ temperature differences Annex C
1, 2
θ temperature Annex C
θ cooling medium temperature 9.4.3, Annex B, Annex C
a
θ equilibrium temperature Annex C
m
θ temperature when transformer starts to cool Annex C
n
θ temperatures for calculation of thermal time constant or 9.3.5, 9.4.3, Annex C
0, 1, 2
winding temperatures during heating test
τ thermal time constant Annex C
τ thermal time constant at given on-load time Annex C
2
τ thermal time constant at permanent output current Annex C
2p
5 Construction, additional equipment
5.1 Thermal protection
If the transformer and/or the rectifier are equipped with thermoswitches, they shall have a normally
closed contact. The insulation shall be suitable for the test conditions prescribed in this standard.
5.2 Output current sensing coil
If the transformer is equipped with an output current sensing coil, the degree of protection of an
externally mounted coil shall be lP 55.
The conversion coefficient shall be:
— 50 Hz mains frequency: 150 mV/kA with a load resistance of 1 000 Ω under full sine wave up to
80 °C;
— 60 Hz mains frequency: 180 mV/kA with a load resistance of 1 000 Ω under full sine wave up to
80 °C
The tolerance of the conversion coefficient after mounting in the transformer shall be ± 3 %.
The current sensing coil shall be a Rogowski type. The internal resistance of the current sensing coil
shall be 5 to 50 Ω. White and brown colour coding shall be used for the wiring.
4 © ISO 2014 – All rights reserved

---------------------- Page: 16 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

6 Physical environment and operating conditions
6.1 General
Transformers shall be suitable for use in the physical environment and operating conditions as specified
below.
When the physical environment and/or operating conditions are outside those specified below, an
agreement may be needed between the supplier and the user, (see, for example, IEC 60204-1:1997,
Annex B).
NOTE Examples of these conditions are: outdoor use, different altitude, different temperature of cooling
medium, high humidity, unusually corrosive fumes, steam, excessive oil vapour, abnormal vibration or shock,
excessive dust, unusual sea coast or shipboard conditions.
6.2 Ambient air temperature
Transformers shall be capable of operating correctly in an ambient air temperature between + 5 °C and
+ 40 °C.
In case of other maximum temperatures of the cooling medium, see Annex B.
6.3 Humidity
Transformers shall be capable of operating correctly with a relative humidity up to 95 %.
Harmful effects of condensation shall be avoided by:
— appropriate design of the transformer (e.g. application of electrical potting or encapsulation);
— appropriate design of the welding equipment (e.g. built in heaters, air conditioners, drain holes);
— additional measures (e.g. cooling liquid temperature regulation).
6.4 Altitude
Transformers shall be capable of operating correctly at altitudes up to 1 000 m above mean sea level.
In case of other altitudes, see Annex B.
NOTE At altitudes over 1 000 m, additional electrical safety considerations can be required: see IEC 60664–
1.
6.5 Transportation and storage
Transformers shall be designed to withstand, or suitable precautions shall be taken to protect against,
transportation and storage temperatures between – 25 °C and + 55 °C and for short periods not exceeding
24 h up to + 70 °C. Suitable means shall be provided to prevent damage from humidity, vibration and
shock.
Consideration should be given to frost or freezing protection and draining of the cooling water before
shipping or storage.
6.6 Provisions for handling
Transformers that weigh over 25 kg shall be provided with suitable means for handling by hoists, cranes
or similar equipment such as threaded holes or lifting lugs as appropriate.
© ISO 2014 – All rights reserved 5

---------------------- Page: 17 ----------------------

SIST EN ISO 5826:2014
ISO 5826:2014(E)

6.7 Cooling liquid temperature
The temperature of the cooling liquid can be up to 30 °C at the inlet of the transformer.
For cooling liquid temperatures above 30 °C, see Annex B.
Condensation caused by high cooling liquid flow or low cooling liquid temperature in relation to the
relative humidity should be prevented.
NOTE For air cooled transformers, see 6.2 and Annex B.
7 Tests
7.1 Test conditions
The tests shall be carried out on a new, dry and completely assembled transformer at an ambient air
temperature between + 10 °C and + 40 °C.
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Oprema za uporovno varjenje - Transformatorji - Splošne specifikacije, veljavne za vse transformatorje (ISO/FDIS 5826:2013)Widerstandsschweißeinrichtungen - Transformatoren - Allgemeine Anforderungen anwendbar für alle Transformatoren (ISO/FDIS 5826:2013)Matériel de soudage par résistance - Transformateurs - Spécifications générales applicables à tous les transformateurs (ISO/FDIS 5826:2013)Resistance welding equipment - Transformers - General specifications applicable to all transformers (ISO/FDIS 5826:2013)29.180Transformatorji. DušilkeTransformers. Reactors25.160.30Varilna opremaWelding equipmentICS:Ta slovenski standard je istoveten z:FprEN ISO 5826kSIST FprEN ISO 5826:2013en,fr,de01-december-2013kSIST FprEN ISO 5826:2013SLOVENSKI
STANDARD



kSIST FprEN ISO 5826:2013



© ISO 2013Resistance welding equipment — Trapplicable to all transformersMatériel de soudage par résistance — Transformateurs — Spéci Ôications générales applicables à tous les transformateursINTERNATIONAL STANDARDPlease see the administrative notes on page iiiReference numberISO/FDIS 5826:2013(E)ISO/FDIS5826ISO/TC 44/SC 6Secretariat: DINVoting begins on: 2013-Voting terminates on: 2013-1RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPOR TING DOCUMENTATION.IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STAN­DARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.FINALDRAFTkSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E) ii © ISO 2013 – All rights reservedCOPYRIGHT PROTECTED DOCUMENT©
ISO 2013All rights reservedä Unless otherwise speci Ðiedá no part of this publication may be reproduced or utilized otherwise in any form or by any meansá electronic or mechanicalá including photocopyingá or posting on the internet or an intranetá without prior written permissionä Permission can be requested from either ISO at the address below or ISOïs member body in the country of the requester.ISO copyright of ÐiceTel. + 41 22 749 01 11Fax + 41 22 749 09 47Eæmail copyright 7isoäorgWeb www.iso.orgPublished in SwitzerlandkSIST FprEN ISO 5826:2013



ISO/CEN PARALLEL PROCESSING­cessed under the ISO-lead mode of collaboration as de Ðined in the Vienna Agreementä The
Ðinal draft was established on the basis of comments received during a parallel enquiry on the draftäThis
Ðinal draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel two­month approval vote in ISO and formal vote in CEN.Positive votes shall not be accompanied by comments.Negative votes shall be accompanied by the relevant technical reasons.ISO/FDIS 5826:2013(E) © ISO 2013 – All rights reserved iiikSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E) iv © ISO 2013 – All rights reservedContents PageForeword .vi1 Scope .12 Normative references .1 u Terms and de Ðinitions .14 Symbols and abbreviated terms .35 Construction, additional equipment.45.1 Thermal protection .45.2 Output current sensing coil .46 Physical environment and operating conditions .46.1 General .46.2 Ambient air temperature .4 xä u Humidity .56.4 Altitude .56.5 Transportation and storage .56.6 Provisions for handling .56.7 Cooling liquid temperature .57 Test conditions .57.1 General .5 yä t Type tests .67.3 Routine tests .68 Protection against electric shock .78.1 Insulation resistance .78.2 Dielectric strength.78.3 Calibration of output current sensing coil .88.4 Protection against electric shock in normal service (direct contact) .88.5 Protection against electric shock in case of fault condition (indirect contact) .88.6 Class II transformer insulation requirements .89 Thermal rating .99.1 General .99.2 Heating test conditions .119.3 Methods of temperature measurements .1210 Rated output voltage .1410.1 General .1410.2 a.c. no­load voltage (U20) .1410.3 d.c. no­load voltage (U2d) .1411 No-load input current (I10) .1511.1 General .1511.2 Measurement procedure .1512 Short-circuit voltage (Ucc) .1513 Output current under load condition .1614 Cooling liquid circuit .1615 Dynamic behaviour .1716 Rating plate .1716.1 General .1716.2 Description .1717 Instruction manual .19Annex A (informative) Example of a rating plate .20kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E) © ISO 2013 – All rights reserved vAnnex B (normative) Corrections for higher altitudes and cooling medium temperatures .21Annex C (informative) Notes on physical concepts and comments on some de Ðinitions .22Annex D (informative) Type code for single-phase transformers for alternating welding current 28Bibliography .29kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)Forewordthrough ISO technical committeesä Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizationsá governmental and nonægovernmentalá in liaison with ISOá also take part in the workä electrotechnical standardizationäThe procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be notedä This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rightsä ISO shall not be held responsible for identifying any or all such patent rightsä Details of any the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO speci Ðic terms and expressions related to conformity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade
see the following URLã Foreword æ Supplementary informationThe committee responsible for this document is ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding and allied mechanical joiningäThis third edition cancels and replaces the second edition (ISO 5826:1999), which has been technically revisedäRequests for of Ðicial interpretations of any aspect of this standard should be directed to the Secretariat of ISO/TC 44/SC
x via your national standards bodyá a complete listing of which can be found at wwwäisoäorgä vi © ISO 2013 – All rights reservedkSIST FprEN ISO 5826:2013



FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 5826:2013(E)Resistance welding equipment — Transformers — General speci Ðications applicable to all transformers1 ScopeThis International Standard gives speci Ðications applicable to the following types of transformers for use in resistance welding equipment: singleæphase transformers for aäcä weldingá typically operating at
w r Hz or
x r Hzâ singleæphase transformers with connected recti Ðier for däcä weldingá typically operating at
w r Hz or
x r Hzâ singleæphase inverter transformers with connected recti Ðier for däcä weldingá typically operating at
v r r Hz to
t kHzâ threeæphase transformers with connected recti Ðier for däcä weldingá typically operating at
w r Hz or
x r HzäFor the purposes of this International Standard, the term transformer can refer to the transformer alone or with connected recti ÐieräThis International Standard applies to transformers built to protection class I or II according to IEC 61140.NOTE The requirements of this International Standard can be supplemented by other resistance welding transformer standards, e.g. ISO 22829 and ISO 10656.2 Normative referencesThe following documentsá in whole or in partá are normatively referenced in this document and are indispensable for its applicationä For dated referencesá only the edition cited appliesä For undated ISO 669, Resistance welding — Resistance welding equipment — Mechanical and electrical requirementsIEC 60085, Electrical insulation — Thermal evaluation and designationIEC 60529, IEC 61140, ISO 17657­3, Resistance welding Welding current measurement for resistance welding Part
yã Current sensing coilISO 17657­4, Resistance welding Welding current measurement for resistance welding Part
zã Calibration systemISO 17677­1, Resistance welding
wã Spotá projection and seam welding u Terms and de ÐinitionsFor the purposes of this documentá the terms and de Ðinitions given in ISO
s y x y yæ s and ISO
x x {á and the following applyä© ISO 2013 – All rights reserved 1kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)3.1transformerærecti Ðier unittransformer incorporating a fullæwave recti Ðier in its output circuit3.2input voltageU1RMS value of the voltage applied to the primary terminals of the transformer3.3rated supply voltageU1NNote
s to entryã This voltage can be different from the mains voltageä3.4d.c. no load voltageU2dfor transformers, RMS value of the voltage at the output when a load resistance is connected across the output terminals3.5input currentI1RMS value of the current at the input terminals of the transformer3.6output currentI2RMS value of the current at the output terminals of the transformer3.7output current at a given duty factorI2XRMS value of the current at the output terminals of the transformer at a duty factorá X3.8no-load input currentI10RMS value of the current at the input terminals of the transformer with open circuit output terminals3.9permanent input currentI1p, ILpmaximum rated value of the current at the input terminals corresponding to the permanent output currentNote
s to entryã The relationship between input and output currents depends on the type of transformeräNote
t to entryã I1p is used for singleæphase transformersâ ILp is used for three­phase transformers.3.10permanent output currentI2p [SOURCE: ISO 669]Note
s to entryã The permanent output current is a standardized parameter that is used for comparison and characterization between different transformersä The value of the permanent output current is dependent on the test conditions as described in this standard. 2 © ISO 2013 – All rights reservedkSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)3.11output current under load conditionI2Rinstantaneous RMS value of the output current delivered by the transformer with a load resistanceá R3.12rated permanent apparent input powerS1prated permanent apparent power calculated by U1N × I1pNote
s to entryã Welding equipment permanent powerá Spá determined in accordance with ISO
x x {á may be different from its welding transformer rated permanent apparent input power, S1p.4 Symbols and abbreviated termsThe symbols used in this International Standard are listed in Table 1.Table 1 — SymbolsSymbolDescriptionUsed in [section]I1input current3.5, 9.3I10no­load input current3.8, Clause 11I1prated permanent input current (single­phase transformers)3.9, 9.1, Clause 12ILprated permanent input current (three­phase transformers)3.9, 9.1I2output current3.6, 9.3, Annex CI2ppermanent output current at
s r r
¨ duty factor3.10, 9.1, 9.3, 16.2, Annex CI2Routput current on load condition3.11, Clause 13I2Xoutput current at a given duty factor3.7, Annex CMmass16.2SXinput power at a given duty factorAnnex CS wprated permanent apparent input power3.12, 9.1, 16.2, Annex CQrated cooling liquid
ÐlowClause 14, 16.2R1initial resistance of a winding9.2.5, 9.3.2R2resistance of a winding at end of heating test9.3.2TTimeAnnex Ct1on­load timeAnnex CTcycle timeAnnex CU winput voltage3.2, Clause 13Uccrated short­circuit voltageClause 12, Annex CU1ccinput short­circuit voltageClause 12U1Nrated supply voltage3.3, 9.1, 9.3, 10.2, 10.3, Clauses 11, 13, 16.2, Annex CU20a.c. no­load voltage10.1, 10.2, 16.2U2dd.c. no­load voltage3.4, 10.1, 10.3, 16.2Xduty factor9.3, Annex CXmduty factor of magnetic circuitAnnex CZ2total impedance referred to outputClauses 12 and 17ppressure drop of cooling liquid circuitClause 14, 16.2 © ISO 2013 – All rights reserved 3kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)SymbolDescriptionUsed in [section]1, 2temperature differencesAnnex CtemperatureAnnex Cacooling medium temperature9.3.2, Annex B, Annex Cmequilibrium temperatureAnnex Cntemperature when
transformer starts to coolAnnex C0, 1, 2temperatures for calculation of thermal time constant or winding temperatures during heating test9.2.5, 9.3.2, Annex Cthermal time constantAnnex C2thermal time constant at given on­load timeAnnex C2pthermal time constant at permanent output currentAnnex C5 Construction, additional equipment5.1 Thermal protectionclosed contact. The insulation shall be suitable for the test conditions prescribed in this standard.5.2 Output current sensing coilIf the transformer is equipped with an output current sensing coil, the degree of protection of an externally mounted coil shall be lP
w wäThe conversion coef Ðicient shall beã
w r Hz mains frequencyã
s w r mV/kA
¹Câ
x r Hz mains frequencyã
s z r mV/kA
¹CThe tolerance of the conversion coef Ðicient after mounting in the transformer shall be
¬
u
¨äThe current sensing coil shall be a Rogowski typeä The internal resistance of the current sensing coil shall be
w to
w r 6 Physical environment and operating conditions6.1 GeneralTransformers shall be suitable for use in the physical environment and operating conditions as speci Ðied belowäWhen the physical environment and/or operating conditions are outside those speci Ðied belowá an
x r t r væ sã s { { yá Annex BNOTE Examples of these conditions are: outdoor use, different altitude, different temperature of cooling mediumá high humidityá unusually corrosive fumesá steamá excessive oil vapourá abnormal vibration or shocká excessive dust, unusual sea coast or shipboard conditions.6.2 Ambient air temperatureTransformers shall be capable of operating correctly in an ambient air temperature between
ª
w
¹C and
ª
v r
¹Cä Table 1 4 © ISO 2013 – All rights reservedkSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)In case of other maximum temperatures of the cooling medium, see Annex B.6.3 HumidityTransformers shall be capable of operating correctly with a relative humidity up to
{ w
¨äHarmful effects of condensation shall be avoided byã a a— additional measures (e.g. cooling liquid temperature regulation).6.4 AltitudeTransformers shall be capable of operating correctly at altitudes up to
s
r r r m above mean sea leveläIn case of other altitudes, see Annex B.NOTE At altitudes over
s
r r r má additional electrical safety considerations can be requiredã see IEC
x6.5 Transportation and storageTransformers shall be designed to withstand, or suitable precautions shall be taken to protect against,
t w
¹C and
ª
w w
¹C and for short periods not exceeding
t v h up to
ª
y r
¹Cä Suitable means shall be provided to prevent damage from humidityá vibration and shockäshipping/storage.6.6 Provisions for handlingTransformers that weigh over
t w kor similar equipment such as threaded holes or lifting lugs as appropriate.6.7 Cooling liquid temperatureThe temperature of the cooling liquid can be up to
u r
¹C at the inlet of the transformeräFor cooling liquid temperatures above
u r
¹Cá see Annex B.Condensation caused by high cooling liquid
Ðlow or low cooling liquid temperature in relation to the relative humidity should be preventedäNOTE For air cooled transformers, see 6.2 and Annex B.7 Test conditions7.1 GeneralThe tests shall be carried out on a newá dry and completely assembled transformer at an ambient air temperature between
ª
s r
¹C and
ª
v r
¹Cä The ventilation shall be identical with that prevailing under normal service conditions. The measuring devices used shall not interfere with the normal ventilation of the transformer or cause transfer of heat to or from it.Liquid cooled transformers shall be tested with liquid conditions as speci Ðied by the manufacturerä © ISO 2013 – All rights reserved 5kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)The accuracy of measuring instruments shall beã electrical measuring instrumentsã
¬
sá r
¨ fullæscaleâ output current measuring instrumentsã
¬
w
¨ fullæscaleá except for instruments used for veri Ðication of the current sensing coilã
¬
t
¨ full scaleâ temperature measuring devicesã
¬
t KäUnless otherwise speci Ðiedá the tests required in this International Standard are type testsä7.2 Type testsAll type tests shall be carried out on the same transformer except otherwise speci Ðiedäg), h) and i). general visual inspectionâb) insulation resistance (see 8.1NOTE The preliminary check on insulation resistance is required to determine whether the transformer is safe before carrying out the remaining testsäc) thermal rating (see Clause 9d) short­circuit voltage, where applicable (see Clause 12e) output current under load condition, where applicable (see Clause 13 p8.4g) insulation resistance (see 8.1h) dielectric strength (see 8.2 dClause 15 general visual inspectionäThe other tests not mentioned above that are required by this International Standard can be carried out in any convenient sequenceä7.3 Routine testsThe following routine tests shall be carried out in the sequence given: general visual inspectionâb) dielectric strength (see 8.2NOTE The dielectric strength test is required to determine whether the transformer is safe before carrying out the remaining testsäc) rated output voltage (see Clause 10d) cooling liquid circuit (see Clause 13e) general visual inspection. 6 © ISO 2013 – All rights reservedkSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)8 Protection against electric shock8.1 Insulation resistanceCompliance is checked by measuring the insulation resistance using a däcä voltage of
w r r V between the input and output windingsâ andb) the windings and the frame.For transformers with connected recti Ðierá the diodes shall be short circuited during this testäLiquid­cooled transformers shall be tested without cooling liquid.8.2 Dielectric strengthThe insulation shall withstand the following test voltages without any
Ðlashover or breakdownã
Ðirst test of a welding transformerã test voltages given in Table 2âb) repetition of the test of the same welding transformer: test voltage 80 % of the values given in Table 2.Table 2 — Dielectric test voltagesMaximum rated voltagea V r.m.s.a.c. dielectric test voltage V r.m.s.All circuitsOutput circuit to input circuit/thermoswitches and sensing coil circuits to input and out-put circuitscInput circuit to transformer framed Class I trans-formersbClass II trans-formersbGrounded frame (accessi-ble or not accessible) or not grounded, not accessible, frameNot grounded, accessible, frameUp to 50250500——2001 0002 0001 0002 0004501 8753 7501 8753 7507002 5005 0002 5005 0001 0002 7505 5002 7505 500 NOTE The maximum rated voltage is valid for earthed and unearthed systemsäa For intermediate values, except between 200 V and 450 V, interpolation of the test voltages is allowed. Interpolation of the test voltage between
t r r V and
v w r V is allowed for equipment designed to be installed on delta corner grounded supply networks onlyb See 8.5.c As equipment design is not knowná this standard speci Ðies the same value to both input and output circuitá also if both may be not requiredäd Tinstallation inside enclosures)The a.c. test voltage shall be of an approximate sine wave­form with a peak value not exceeding 1,45 times the rämäsä valueá having a frequency of approximately
w r Hz or
x r Hzä © ISO 2013 – All rights reserved 7kSIST FprEN ISO 5826:2013



ISO/FDIS 5826:2013(E)The test voltage generator shall deliver the prescribed voltage up to the tripping current. Tripping is regarded as a
Ðlashover or a breakdownä The tripping current setting can be selected according to the transformer capacitive dispersion current. The maximum permissible setting of the tripping current shall be 100 mA. Optionallyá testing can be carried out with a däcä test voltage of
sá v times the rämäsä test voltage in accordance with Table 2.Transformers with connected recti Ðier shall be tested after assemblyä Recti Ðiersá their protective devices and other solid­state electronic components or capacitors, can be short­circuited or disconnected as required.Liquid­cooled transformers shall be tested without cooling liquid.The test voltage may be raised to the full value slowly at the discretion of the manufactureräConformity shall be checked by application of the test voltage for
x r sä8.3 Calibration of output current sensing coilTesting shall be carried out in accordance with ISO 17657­3 and ISO 17657­4.8.4 Protection against electric shock in normal service (direct contact)The minimum degree of protection for transformers provided by the enclosure shall be IP
w v as speci Ðied in IEC 60529.If the transformer is intended to be inæbuiltá the degree of protection may be IP
r räCompliance shall be veri Ðied in accordance with IEC
x r w t {ä8.5 Protection against electric shock in case of fault condition (indirect contact)Protection against indirect contact is intended to prevent hazardous situations due to an insulation fault between live parts and exposed conductive parts of the equipment. Protective measures are selected in welding equipment designä They can include use of transformers with double or reinforced isolation of the output circuitNOTE For different types of welding equipment indirect contact protective measuresá see IEC Regarding the output circuit fault condition onlyá resistance welding transformers are classi Ðied as followsäa) Class I resistance welding transformers Timplemented at welding equipment design by protective bonding or ot
...