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TitleFrance Transfo
Tags Electricity Relay Transformer Ventilation (Architecture)
File Size428.5 KB
Total Pages27
Document Text Contents
Page 1

three-phase HV / LV transformers



mineral oil-immersed distribution models



Instructions for
installation,

commissioning
and maintenance



Contents



taking delivery 3



handling 4



installation 6



HV and LV connections 15



transformer operation in parallel 19



maintenance 20



after-sales service 23



precommissioning checks 24



GEa220000a Page 1 Mardi, 13. avril 1999 8:40 08

Page 2

2



France Transfo



Warning



This guide intended for standard
range oil-immersed distribution
transformers as described in
France Transfo product
catalogues.

If in doubt, our After-Sales Service
remains wholly at your disposal.

Tél. (33) 03 87 70 57 72
fax: (33) 03 87 70 56 21



GEa220000a Page 2 Mardi, 13. avril 1999 8:40 08

Page 13

13



France Transfo



Breather type transformer with expansion tank (figure 7)



The transformer tank is connected by pipework to an expansion tank, mounted
above the unit, which ensures that the dielectric fluid level remains sufficiently high
in the transformer tank: variations in dielectric fluid volume are absorbed by the
expansion tank which remains at atmospheric pressure.

This type of unit therefore requires maintenance which is both regular and suited
to the climatic conditions in the vicinity of the transformer (see page 21).



Protection accessory : the Buchholz relay



Fitted to the pipework linking the expansion tank to the transformer tank, this
accessory ensures protection against internal faults only, by monitoring dielectric
fluid levels and fluctuations.

To ensure proper operation, the Buchholz relay must be completely bled of air.

Faults detected on live transformer unit



m



Dielectric fluid level is detected as low.
The Buchholz relay is partially empty, the top level float is at the bottom.
Reasons for this low fluid level are the same as those given for the protection
relay (see page 11) but in the present case, the relay will activate automatically
the alarm.



m



Major discharge of oil towards the expansion tank is detected
A violent emission of gas, resulting in serious electrical faults within the
transformer tank, leads to a large discharge of oil to the expansion tank, which
causes the Buchholz relay bottom float to pivot; the transformer unit must be
de-energised immediately and permanently.
Contact FRANCE TRANSFO After-Sales Service (see page 23), or your
SCHNEIDER correspondent.

7
oil



Installation



GEa220000a Page 13 Mardi, 13. avril 1999 8:40 08

Page 14

14



France Transfo



Dielectric fluid retention system



In an environmental protection context, the retention system used must be
capable of containing the total quantity of dielectric fluid, unless otherwise
specified by local regulations.

It may comprise:
- a raised door threshold if the plantroom floor is oil tight,
- a low oil tight wall around the transformer,
- a steel trough positioned beneath the transformer.

In the last two cases, ensure that the system does not adversely affect transformer
cooling by preventing air circulation around the tank cooling fins.



Installation



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Page 26

26 France Transfo

notes

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Page 27

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France Transfo
BP 10140
F 57281 Maizières-lès-Metz Cedex
Tel.: (33) 03 87 70 57 57
fax.: (33) 03 87 51 10 16

GEa 220000 a

Since this manual was edited, a number of alterations may have
been incorporated in the equipment you have received. The sole
reason for this resides in our constant efforts to improve the
quality and performance of our equipment.

Edited by: France Transfo - 03/99
Typesetting and illustrations: COREDIT

GEa220000a Page 28 Mardi, 13. avril 1999 8:40 08

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