EN 50216-7:2002
(Main)Power transformer and reactor fittings - Part 7: Electric pumps for transformer oil
Power transformer and reactor fittings - Part 7: Electric pumps for transformer oil
EN 50216-7 covers requirements for electric pumps which generate the circulation of insulating oil in transformers and reactors conforming to the EN 60076 series and their associated cooling systems. The pumps covered in this standard are rotodynamic pumps driven by a squirrel cage induction motor which is immersed in the insulating oil. Pump sets conforming to this standard may be of in-line or end suction design. This standard includes requirements for the electrical and hydraulic performance, mechanical design, routine testing and type testing. Additionally, performance and dimensions of preferred sizes of pump sets are specified (see normative annexes A and B). The insulating oils considered comply with subclause 2.5 of IEC 60296-1. If other insulating liquids are to be used, the performance and design of the pump shall be agreed between purchaser and manufacturer.
Zubehör für Transformatoren und Drosselspulen - Teil 7: Elektrische Pumpen für Transformatorenöl
Dieser Teil der EN 50216 legt Anforderungen an elektrische Pumpen fest, die den Umlauf des Isolieröls in Transformatoren und Drosselspulen nach der Reihe 60076 und deren zugeordneten Kühlungseinrichtungen erzeugen. Die in dieser Norm behandelten Pumpen sind rotationsdynamische Pumpen, die durch einen Kurzschlussläufermotor angetrieben werden, der im Isolieröl eingetaucht ist. Pumpensätze, die dieser Norm entsprechen, dürfen als Einbaupumpe oder als Anbaupumpe ausgeführt sein. Diese Norm beinhaltet Anforderungen an das elektrische und hydraulische Betriebsverhalten, die mechanische Ausführung, die Stückprüfung und die Typprüfung. Zusätzlich sind Betriebsverhalten und Abmessungen von bevorzugten Pumpensätzen festgelegt (siehe normative Anhänge A und B). Die betrachteten Isolieröle entsprechen IEC 60296-1, Abschnitt 2.5. Falls andere Isolierflüssigkeiten zur Anwendung kommen, müssen das Betriebsverhalten und die Ausführung der Pumpe zwischen Käufer und Hersteller vereinbart werden.
Accessoires pour transformateurs de puissance et bobines d'inductance - Partie 7: Pompes électriques pour transformateur immergé
La EN 50216-7 concerne les règles des groupes électropompes qui engendrent la circulation des huiles isolantes des transformateurs et des inductances conformes à la série de normes EN 60076 et leurs systèmes de refroidissement associés. Cette norme concerne uniquement les groupes constitués d'une pompe centrifuge et d'un moteur asynchrone triphasé à rotor en court-circuit complètement immergé dans l'huile isolante. La conception des pompes conformes à cette norme peut présenter une circulation du fluide en ligne ou radiale. Cette norme définit les caractéristiques électriques et hydrauliques, la conception mécanique, les essais de série et de type. D'autre part, les performances et dimensions recommandées des pompes sont spécifiées (voir annexes A et B). Les huiles isolantes considérées répondent au paragraphe 2.5 de la CEI 60296 1. Si d'autres liquides isolants sont utilisés, les caractéristiques et la conception de la pompe feront l'objet d'un accord entre l'acheteur et le constructeur.
Power transformer and reactor fittings - Part 7: Electric pumps for transformer oil
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2002
Power transformer and reactor fittings - Part 7: Electric pumps for transformer oil
Power transformer and reactor fittings -- Part 7: Electric pumps for transformer oil
Zubehör für Transformatoren und Drosselspulen -- Teil 7: Elektrische Pumpen für
Transformatorenöl
Accessoires pour transformateurs de puissance et bobines d'inductance -- Partie 7:
Pompes électriques pour transformateur immergé
Ta slovenski standard je istoveten z: EN 50216-7:2002
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50216-7
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2002
ICS 29.180
English version
Power transformer and reactor fittings
Part 7: Electric pumps for transformer oil
Accessoires pour transformateurs Zubehör für Transformatoren
de puissance et bobines d'inductance und Drosselspulen
Partie 7: Pompes électriques Teil 7: Elektrische Pumpen
pour transformateur immergé für Transformatorenöl
This European Standard was approved by CENELEC on 2001-07-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50216-7:2002 E
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
EN 50216-7 on 2001-07-01.
The following dates were 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) 2002-08-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-08-01
EN 50216-7 is to be read in conjunction with EN 50216-1.
__________
- 3 - EN 50216-7:2002
Contents
Page
1 Scope . 4
2 Normative references. 4
3 Definitions. 5
4 Design . 5
4.1 General. 5
4.2 Casing/enclosure . 6
4.3 Terminal box . 6
4.4 Hydraulic performance. 6
4.5 Electrical performance . 8
4.6 Noise. 8
4.7 Labelling . 8
5 Materials. 9
6 Preferred sizes . 9
7 Tests. 9
7.1 Routine tests. 9
7.2 Type tests . 10
7.3 Special tests . 12
8 Preparation for despatch. 12
8.1 Painting. 12
8.2 Preparation for transport and storage. 12
Annex A (normative) Preferred sizes of end-suction pumps. 13
Annex B (normative) Preferred sizes of in-line pumps . 15
Annex C (informative) Information required with enquiry, proposal
and purchase order . 17
Annex D (informative) Example of use of hydraulic interchangeability tolerances . 18
1 Scope
EN 50216-7 covers requirements for electric pumps which generate the circulation of insulating
oil in transformers and reactors conforming to the EN 60076 series and their associated
cooling systems.
The pumps covered in this standard are rotodynamic pumps driven by a squirrel cage
induction motor which is immersed in the insulating oil.
Pump sets conforming to this standard may be of in-line or end suction design.
This standard includes requirements for the electrical and hydraulic performance, mechanical
design, routine testing and type testing. Additionally, performance and dimensions of preferred
sizes of pump sets are specified (see normative annexes A and B).
The insulating oils considered comply with subclause 2.5 of IEC 60296-1. If other insulating
liquids are to be used, the performance and design of the pump shall be agreed between
purchaser and manufacturer.
2 Normative references
Addition to EN 50216-1:
EN 809 1998 Pumps and pump units for liquids - Common safety requirements
EN 60034-1 1998 Rotating electrical machines - Part 1: Rating and performance
(IEC 60034-1:1996, mod)
EN 60034-9 1997 Rotating electrical machines - Part 9: Noise limits
(IEC 60034-9:1997)
EN 60076 Series Power transformers (IEC 60076 series, mod)
EN 60076-1 1997 Power transformers - Part 1: General (IEC 60076-1:1993, mod)
HD 53.8 S5 1998 Rotating electrical machines - Part 8: Terminal markings and
direction of rotation of rotating machines
(IEC 60034-8:1972 + A1:1990 + A2:1996)
HD 566 S1 1990 Thermal evaluation and classification of electrical insulation
(IEC 60085:1984)
IEC 60279 1969 Measurement of the winding resistance of an a.c. machine during
operation at alternating voltage
ISO 179 1993 Determination of Charpy impact strength
ISO 185 1988 Grey cast iron - Classification
ISO 281 1990 Rolling bearings - Dynamic load ratings and rating life
ISO 3522 1984 Cast aluminium alloys - Chemical composition and mechanical
properties
- 5 - EN 50216-7:2002
ISO 4406 1989 Hydraulic fluid power - Fluids - Methods for coding level of
contamination by solid particles
ISO 7005-2 1988 Metallic flanges - Part 2: Cast iron flanges
ISO 9906 1999 Rotodynamic pumps - Hydraulic performance acceptance tests -
Grades 1 and 2
3 Definitions
For the purpose of this standard, the following definitions apply:
3.1
in-line pump
a pump having the suction and delivery flanges on the same axis. It can be of the centrifugal
or helicoidal type. For transformer oil pumps, the axis of the flanges generally corresponds to
the axis of rotation of the pump rotor
3.2
end suction pump
a pump having the suction and delivery flanges on perpendicular axes. It can be of the
centrifugal type only. The axis of the suction flange corresponds to the axis of rotation of the
pump rotor.
4 Design
4.1 General
The requirements of EN 50216-1, including maximum oil temperature [115 °C], shall apply to
equipment covered by this standard. Minimum oil temperature shall be in accordance with
EN 60076-1 [-25 °C].
All pumps shall conform to the essential health and safety requirements in accordance with
EN 809.
Motor cooling and bearing lubrication shall be by circulation of the oil being pumped. Where
rolling element bearings are used, they shall be of standard design with life in accordance with
ISO 281 exceeding 200 000 hours at rated conditions. The expected life of the pump without
bearing change shall not restrict the expected life of the transformer under normal service
conditions.
Pumps shall be suitable for mounting with the axis of the rotating unit either horizontal or
vertical. If other positions are to be used, this shall be made known to the manufacturer.
A mechanical or electrical device shall be fitted, unless otherwise agreed by the purchaser, to
allow the direction of rotation to be determined. Reverse rotation shall not cause damage to
the pump.
All enclosures for electric pumps shall be manufactured to give, as a minimum, protection in
accordance with IP 54 of EN 60529.
For pumps used for combined OFF/ON cooling (e.g. with rated pressure of 50 kPa or less), the
design of the pump and its impeller shall be such as to minimize the restriction to oil flow with
the pump switched off.
To ensure that there is no contamination of transformer oil, pump sets shall be clean and free
of foreign bodies.
4.2 Casing/enclosure
Casings/enclosures shall be capable of withstanding a maximum working pressure of 300 kPa
under operating conditions without leakage.
Suction and delivery flanges shall conform to PN10 of ISO 7005-2 for end suction pumps and
PN6 or PN10 for in-line pumps. These flanges shall generally be suitable to support the pump
in normal operation. Where the pump design is such that additional supports are required, e.g.
for high power end suction pumps, this shall be made known by the manufacturer.
NOTE It is the responsibility of the transformer/cooling circuit designer to ensure that the pump is correctly
supported.
Drain and vent connections shall be provided suitable for the installation positions allowed.
If required by the purchaser, internal surfaces of cast iron shall be finished with an oil resisting
protective system.
4.3 Terminal box
Metallic terminal boxes shall have an evacuation hole for condensation.
The manufacturer shall specify the allowable terminal box and cable entry positions. It is
preferred that the cable entry may be repositioned without draining oil from the pump.
The mounting support of the gland shall allow entry of cables in an upward direction for any
mounting position of the pump. The size of the gland shall be defined by agreement between
purchaser and manufacturer.
An earth terminal is to be provided.
A permanent label in accordance with HD 53.8 shall be provided inside the terminal housing
cover to show the connections required for correct rotation of the pump.
Stud type terminals shall have a diameter adequate to carry the required current and not less
than 6 mm for brass and not less than 4 mm for phosphor bronze or stainless steel.
4.4 Hydraulic performance
Performance curves and nominal ratings for hydraulic performance shall be given for an oil
temperature of 60 °C and with the motor being supplied at rated voltage. Performance curves
shall define the allowable operating range as specified by the pump manufacturer.
Pumps shall perform free of cavitation under operating conditions.
- 7 - EN 50216-7:2002
4.4.1 Hydraulic interchangeability
When replacing one pump with another, it is important that flow velocities in the cooling circuit
are not greatly changed. This may be achieved by ensuring that the pump characteristic
curves are sufficiently similar.
For the purposes of this standard, hydraulic interchangeability is achieved when, for each point
across the allowable operating range, one pump characteristic curve shows flow values within
± 10 % or pressure values within ± 8 % of another curve chosen as a datum (see Figure 1).
Figure 1 - Hydraulic interchangeability across the allowable operating range
Where, in a specific application, sufficient knowledge of the actual flow range is available,
pump characteristic curves may be defined as interchangeable if the above condition is met
across the actual flow range (see Figure 2).
Figure 2 - Hydraulic interchangeability across an actual flow range
Annex D gives examples of the use of these hydraulic interchangeability tolerances.
It should be noted that hydraulic interchangeability does not ensure electrical or mechanical
interchangeability and these will require a separate assessment.
4.5 Electrical performance
4.5.1 Electrical supply
Pumps shall be suitable for direct-on-line starting with a supply voltage between 85 % and
110 % of the nominal voltage and within 94 % - 102 % of nominal frequency . Additionally, the
pump shall be able to start at 85 % voltage at oil temperatures down to - 20 °C and at 90 %
down to - 25 °C without injurious heating.
Motors shall be capable of recovering normal operation in the event of a system disturbance
causing temporary loss of supply volt
...
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