LEGRAND LE06499AE Manuale di servizio

Cast Resin Transformers

Installation, use and maintenance manual

05/21-01 PC LE06499AE

Cast Resin Transformers

Installation, use and maintenance manual

Index

The supplier does not assume any responsibility for the use or inappropriate use of the products mentioned in this

manual.

This guide does not cover all the details or possible variations of the entire series of connections, installation and possible

operations. For further information or to solve specific problems that are not included in this guide, contact Legrand.

THIS ENTIRE DOCUMENT BEFORE YOU COMMENCE THE INSTALLATION.

1 Safety guidelines 4

2 Reference standards 6

3 Rating plate 6

3.1 Conditions for the correct operation of the transformer 6

4 Transport, receipt and storage 7

4.1

Lifting the transformer

4.2 Moving the transformer 11

4.3 Storing the transformer 12

5 Installation 13

5.1 Installation examples 13

5.1.1 Installation in protection enclosure 13

5.1.2 Installation without protection enclosure/box (IP00) 14

5.1.3 Examples of wrong installation 15

5.2 Connections on the Low Voltage side - LV 16

5.3 Connections on the High Voltage side - HV 16

5.4 Tightening torque for electrical and mechanical connections 17

5.5 Positioning 17

5.6 Ventilation 18

5.7 Protection against overvoltages 18

5.8 Temperature monitoring systems 19

6 Commissioning 20

6.1 Earth Connection 20

6.2 Tappings for voltage setting on HV windings 21

6.3 Cleaning 22

6.4 Measurement of windings earth resistance 22

6.5 Energising 22

7 Reception, installation and initial energising of the transformer 23

8 Maintenance 24

8.1 Indicative table on the main maintenance operations 24

8.2 Guide for trouble-shooting 26

8.3 Customer Care 26

9 Additional information 27

10 Environmental aspects 28

1. Safety guidelines

A cast resin transformer is an electrical equipment. It must be installed, protected and used in compliance

with the existing national and international Standards and Regulations. The possible improper installation

and use of a cast resin transformer may cause risks of electric shock or re.

Please, read this installation manually carefully before: lifting, moving or energising the transformer.

Every operation on the transformer must be performed when the transformer is not energised..

Before operating on the CRT, make sure that the transformer cannot be put under voltage without your

permission..

Do not energise the transformer before having connected the core to earth..

Do not energise the transformer before having carefully and completely inspected it.

Do not get close to the cast resin transformer before having connected the windings to earth.

Do not access the transformer operation area or remove the protection devices when the transformer is

under voltage..

Each transformer generates a magnetic eld. For this reason, any carrier of metallic devices as pacemakers

should not get closer than 3 m to an energised transformer.

This transformer must be installed according to the installation directions and preferably by a skilled and

qualied HV electrician.

Do not open, disassemble, alter or modify the transformer with the exception of special indications reported

in the Installation Manual.

All Legrand products must be opened and repaired only by personnel trained and authorized by Legrand.

Legrand is not responsible for any non-authorized opening or repair.

When moving the transformer or its components, always be aware of the risk of crushing.

When lifting the transformer, do not stand under suspended loads.

Cast Resin Transformers

Installation, use and maintenance manual

1. Low Voltage Terminal (LV)

2. Lifting eye bolt

3. Magnetic core

4. Rating plate

5. High Voltage (HV) winding

6. Horizontal movement hooking points

7. Connection earthing

8. Trolley with swivel rollers

9. Voltage switch

10. Delta connection

11. High Voltage Terminals

12. Temperature probe

13. Auxiliary circuit box for probes

IEC 60076-11 – Power transformers – Part. 11: Dry-type transformer.

IEC 60076-1 – Power transformers – Part 1: General.

IEC 60076-2 – Power transformers – Part. 2: Temperature rise.

IEC 60076-3 – Power transformers – Part 3: Insulation levels, dielectric tests and external clearances in air.

IEC 60076-5 – Power transformers – Part. 5: Ability to withstand short circuit.

IEC 60076-10 – Power transformers – Part. 10: Determination of sound levels.

IEC 60085 – Electrical insulation – Thermal evalution and designation.

IEC 60270 – High-voltage test techniques – Partial discharge measurements.

IEC 60529 – Degrees of protection provided by enclosures (IP code).

2. Reference standards

3. Rating plate

3.1 Conditions for the correct operation of the transformer

• Respect of all the instructions reported in this manual.

• Operation of the transformer in accordance with the rating plate data.

• Earth connection of the transformer with the correct terminals.

• Protection of the transformer against: chemical agents, pollution, atmospheric pollution, sun radiation, vegetation and

animals that could influence the normal operating conditions.

• Protection of the transformer against mechanical damages during installation and operation.

• Protection against overvoltages.

A rating plate showing nominal values and serial number is applied on each transformer.

Cast Resin Transformers

Installation, use and maintenance manual

During transport, the transformers must be adequately fixed as indicated in the explanatory images. HV and LV connec-

tions must not be stressed by the retaining straps.

4. Transport, receipt and storage

Any non-conformity must be recorded on the delivery note and notied to the forwarding agent or to Legrand.

It has to be verified that the data on the rating plate are the same data reported on shipping documents and test reports

of the transformer.

It has to be verified that each transformer is provided with contractual accessories such as rollers, temperature sensors,

control thermometer, etc. …

Once the transformer is at its destination, it is highly recommended to carefully examine it.

In particular the following details have to be verified: HV and LV terminals and connections, presence of scratches and/or

cracks on the windings of HV and their centering with respect to the windings of LV, integrity of the protection enclosure

(if present), presence of impurities, dirt, foreign body, moisture or water.

4.1 Lifting the transformer

Do not stand under suspended loads.

Move the transformer only in vertical position

Use all 4 eye bolts during lifting. Do not allow that the angle between the ropes to exceed 60°.The attachment point must

be at least equal to the distance between the eyebolts.

Gradually increase the tension on the lifting cables to avoid sudden shock or stress to the transformer.

If the transformer has a protective enclosure, remove the centre panel of the roof to allow the eyebolts to be attached.

max 45°

Cast Resin Transformers

Installation, use and maintenance manual

Lift the transformer avoiding improper lifting (that may cause it to tip over): be careful about the high centre of gravity

of the transformer.

It is forbidden to lift the transformer by inserting the forks of the forklift under the upper yoke of the core.

Indice

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