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Cast Resin Transformers

Installa

tion, use and main

tenanc

e manual

5.1

Installation examples

The cable connections of High and Low Voltage can be done with cables coming from the bottom or the top.

Some examples are listed below.

5.1.1 Installation in protection enclosure

5. Installation

Dry type cast resin transformers are designed for indoor installations, in a site protected from direct sunlight, in clean and

dry environments, without risk of water intrusion. Standard installation must be:
1. At a sea level height not above 1000 m
2. At a temperature of the cooling air not exceeding the following values:

20 ° C yearly average

30°C warmest month average

40°C maximum

3. According to all other normal operating conditions as per IEC 60076-11 Standard.

During the installation refer to the safety rules existing in your country.

During the operations for the connection and installation, always protect the windings to avoid external

parts such as bolts, washers, cable parts, etc. following into the windings and jeopardizing the insulation

capability of the transformer.

Содержание LE06499AE

Страница 1: ...Cast ResinTransformers Installation use and maintenance manual 05 21 01 PC LE06499AE ...

Страница 2: ...2 ...

Страница 3: ...ring 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 ...

Страница 4: ...cted 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 field For this reason any carrier of metallic devices as pacemakers should not get closer than 3 m to an energised transformer This transformer m...

Страница 5: ...oltage 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 3 ...

Страница 6: ...ements 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 chemic...

Страница 7: ...e 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 ...

Страница 8: ...ow 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 ...

Страница 9: ... 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 ...

Страница 10: ...10 ...

Страница 11: ...re the proper holes are lo cated Do not move the transformers by applying force on the windings or on their connections Avoid moving the transformer on sloping surfa ces It is recommended to avoid moving the tran sformer on the rollers more than 10 m Movement can be made only in two directions according to the rollers orientation Attachment points for horizontal movement using ropes ...

Страница 12: ...lied with the transformer must not be removed If the transformer has been lifted using eyebolts restore the in tegrity of the packaging with adhesive tape The temperature during storage and installation must not decrease below 25 C unless otherwise agreed order stage After a long storage at very low temperatures or in an environment with high humidity the transfor mer must be dried before being pl...

Страница 13: ...ntrusion Standard installation must be 1 At a sea level height not above 1000 m 2 At a temperature of the cooling air not exceeding the following values a 20 C yearly average b 30 C warmest month average c 40 C maximum 3 According to all other normal operating conditions as per IEC 60076 11 Standard During the installation refer to the safety rules existing in your country During the operations fo...

Страница 14: ...be respected HV and LV cables must always be supported to avoid mechani cal stress on the terminals kV D mm 12 125 17 5 170 24 225 36 320 HV cable from Sequence of the phases Activities to be performed Top U V W None Bottom V W U Move the bolts from the top to the bottom terminals HV cables even if shielded must not pass inside delta connec tion on HV side 1U 1V 1W 1U 1W 1V BT MT D D ...

Страница 15: ... manual Example 1 Example 2 5 1 3 Examples of wrong installation High voltage connection cables must not be laid inside the triangle connection and must not touch it The connection cables must not touch the windings or any other active parts of the transformer ...

Страница 16: ...e direct connection between copper and aluminium it is necessary to use Cu pal intermediate plates supplied on request when connecting untreated copper busbars to the LV aluminium terminals 5 3 Connections on the High Voltage side HV The HV terminals positioned on the opposite side to the LV terminals are made with brass bolts placed at the two ends of the winding In case of connection of cables f...

Страница 17: ...30 80 90 150 24 M 18 200 27 M 20 270 30 M 22 360 32 M 24 460 36 5 5 Positioning Cast resin transformers do not ensure contact insulation It is absolutely forbidden to touch the windings while the transformer is energised Therefore the transformer must always be installed in a metal enclosure inside a cage or in a room with doors enabling access only when the transformer is de energised Inside this...

Страница 18: ...thout rollers it is good that they are still lifted off the ground to allow air circulation If provided with protective box the transformers must be placed no closer than 0 2 m from the surrounding walls to allow air circulation In the case in which the enclosure was undersized or poorly ventilated it is advisable to install a forced ventilation system which can ensure a flow rate of 3 5 4 m3 of a...

Страница 19: ...E F 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 Riproduzione vietata Tutti i diritti sono riservati All rights reserved Bticino Spa Viale Luigi Borri 231 21100 Varese VA Italy Tel 39 0332 279111 Fax 39 0332 279216 Type de Dessin Drawing Type Numéro Disegno Drawing N Scala de of Feuille Sheet Modification Modification Èmission Issue Rev Contr Checked Des Drawn Date Date 02 01 00 03 Client Customer Puissance Ra...

Страница 20: ...h conductor should never be lower than the following sections copper 16 mm2 aluminium 35 mm2 steel 50 mm2 Insulation distances between earth conductor and live parts must always be respected M12 1 Verify the mutual position of the windings which must be according to our drawings Verify that the compression bolts are centred on the spacers The spacers must be slightly pressed 2 Check the connection...

Страница 21: ...on ratio NOTE Any changes made to the adjustments must be identically replicated on all windings Example 1 After energising the transformer with a nominal transformer ratio of 20000 400 V a no load secondary voltage of 390 V is detected 2 5 lower This means that the voltage at the primary is 19500V or 2 5 lower To obtain the rated voltage of 400V at the secondary it will be necessary to move the a...

Страница 22: ...ransformer is connected to the electrical system some sparkles could be visible close to the magnetic core This physical phenomenon does not influence the correct working of the transformer and it is not related to the quality If the protection systems are not correctly set inrush current will open the circuit breaker which protects the transformer This can generate high voltages which can damage ...

Страница 23: ...nections to LV busbars the connections consist of flexible elements without mechanical stresses 5 2 6 HV and LV connections and voltage switches are correctly tightened 5 4 7 The minimum insulation distances between the transformer components and the surrounding elements are respected 5 5 8 The conditions for proper transformer cooling are met 5 6 9 The fans and their control circuit are working c...

Страница 24: ...the frequency must be adequately increased Clean dry compressed air maximum pressure 3 bar Dry rag The ventilation gaps between the windings must be completely clean and open 4 Cleaning of the windings from condensation After a period with no applied voltage Dry cloths and dry compressed air at low pressure max 3 bar heating up to 80 C with industrial heat blowers energising without load for at le...

Страница 25: ...25 Cast Resin Transformers Installation use and maintenance manual Calibration table for PT100 thermistors according to the IEC 751 standard ...

Страница 26: ...Bolts of tie rods the lens nucleus Insert flexible connections between transformer and Busbar Insert anti vibration pads under the rollers Tighten loose bolts of tie rods 5 Intervention of the alarm and tripping relay of the temperature control device due to overtemperature Faulty temperature sensors or temperature control device Replace the faulty piece Load current higher than the nominal value ...

Страница 27: ...pacer 4 HV windings 5 Magnetic core 6 LV windings 7 Lower spacer 8 Connection earthing 9 Lower core clamp 10 Truck 11 Bi directional wheels 12 HV delta connection 13 Core lifting rods 14 LV terminals 15 HV terminals 16 Rating plate 17 Auxiliary circuit box for probes 18 Upper core yoke 9 Additional information 17 1 15 4 12 6 7 10 11 3 18 16 2 14 5 8 9 13 ...

Страница 28: ...e recycling operations getting high performance end of life recycling solutions Due to the manufacturing complexity of the product the table below provides the main materials of which it is composed and the relative quantity by weight The precise data for each single transformer are indicated on the plate of the specific transformer itself For its High Efficiency Green Transformers Legrand makes P...

Страница 29: ...29 Cast Resin Transformers Installation use and maintenance manual ...

Страница 30: ...30 ...

Страница 31: ...31 Cast Resin Transformers Installation use and maintenance manual ...

Страница 32: ... right to modify the contents of this booklet and to communicate in any form and modality the changes brought to the same World Headquarters and International Department 87045 LIMOGES CEDEX FRANCE 33 5 55 06 87 87 Fax 33 5 55 06 74 55 www legrand com ...

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