METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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LTEM/DP/MS/ELE-09 Rev.0

POWER GENERATION & DISTRIBUTION FACILITY AT DALEEL FIELD(DALEEL 06-255)

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METHOD STATEMENTFOR

INSTALLATION OF POWER TRANSFORMER

Name Date Signature

Prepared By(LTEM)

G. Prasanth Kumar Reddy

5.4.2011

Reviewed By

(LTEM)Devraj Kingsly

5.4.2011

Approved by

(LTEM)P.GovindRaj

6.4.2011

Approved By

(Daleel)Yousuf Al Harooni

METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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POWER GENERATION & DISTRIBUTION FACILITY AT DALEEL FIELD(DALEEL 06-255)

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LIST OF CONTENTS

1. PURPOSE

2. SCOPE

3. DOCUMENT REFERENCE

4. TOOLS AND PLANTS REQUIRED

5. RESPONSIBILITIES

6. PROCEDURE

7. INSPECTION AND TESTING

8. SAFETY

METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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POWER GENERATION & DISTRIBUTION FACILITY AT DALEEL FIELD(DALEEL 06-255)

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1.0 PURPOSE

The purpose of this method statement is to describe the procedure to be adopted during installation of Power Transformer.

2.0 SCOPE

This procedure shall be applicable for installation and pre-commissioning of Power Transformer of EPC of POWER GENERATION DISTRIBUTION SYSTEM at Daleel Field.

3.0 REFERENCE

1. Contract documents2. General arrangement Drawings3. Manufacturer’s Installation Manual4. Vendor Drawing5. Operation and Maintenance Manual

Any modification done as per the site condition apart from the \ifc shall be incorporated in as built drawing.

4.0 TOOLS AND PLANTS REQUIRED

1. Oil Filtration Machine2. 7 ton truck3. 50 ton crane4. Secondary Injection Kit5. BDV testing Kit6. Winding Resistance tester7. Multimeter FLUKE MAKE8. Megger 5000v9. Cable jointing tool kit10. Tool Box11. Crimping Tool &Die Set12. Torque Wrench13. Compound Gauge14. Temperature Gauge.

5.0 RESPONSIBLITY

5.1 QA/QC ENGINEER

METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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a. Ensure all materials are inspected prior to utilizing at site.b. Ensure the availability of required technical documents like approved method

statement, IFC Drawings at work place.c. Responsible for carrying out Stage inspections and surveillance inspections in

accordance with ITP and as per the project requirement.d. Ensure the work is done by the qualified person (Ex. Cable Jointer).e. Responsible for ensuring the all Testing activities are according to project

requirement.

5.2 ELECTRICAL ENGINEER

Electrical Engineer shall be overall responsible for the safe execution of complete activity including but not limited to.

a. Conforming the installation works as per the schedule.b. Organizing tools and equipment required for the work.c. Assigning work crew.d. Conforming the materials handling in safe manner.

5.3 SAFETY SUPERVISOR

The Safety supervisor shall be responsible for safe execution at site.a. Ensure for effective tool box talk.b. Ensure all the PPEs are available at site and are using correct PPE.c. Ensure the first aid box available at site.d. Ensure the adequate fire extinguishers are available at site.e. Ensure the required warning signs and boards are available at necessary place f. Ensure only required people are available at site.

6.0 PROCEDURE – POWER TRANSFORMER INSTALLATION

6.1 General Requirements

- Ensure the Transformer has been inspected and approved by Client.- Transformer installation, testing &commissioning work will be carried out as per the

Client &Vendor recommendation.- Under any circumstances the Power Transformer shall not be forcefully handled.- House Keeping will be done on daily basis.

6.2 Visual Inspection

After receiving the equipments it shall be inspected at store for any abnormalities and damages. If anything found it shall be reported to Contract Manager/Stores for necessary action.

- Locations of cables entry for equipments shall be visually inspected with respect to trenches, switch racks.

METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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6.3 INSTALLATION OF POWER AND AUXILLARY TRANSFORMER

- Transformer shall be either collected from the stores or other place, or received directly from manufacturer’s works.

- After receiving the equipments inspect for any abnormalities and damages, If any, inform LTEM Construction Manager / Stores for necessary action.

- The foundation for transformer shall be made ready before installation. Verify the cable entry for HV, LV and control cables as per approved drawings.

- Transformer weighing more than 30 tons is normally installed by specialized erection contractor. Transformer up to 30 tons is installed by LTEM using the crane and other lifting facilities.

- Transformer shall be positioned centrally on foundation blocks, and clearances shall be checked.

- Transformer shall be finally positioned for line and level to the dimensions given in the drawings.

- Care shall be taken in positioning in relation to cable, cable duct and busbar trunking positions.

- Transformer more than 10MVA capacity are supplied with main tank separately. Radiators and conservators and topping up oil will be supplied in separate containers/drums.

- Once the transformer is on foundation, oil in drums for topping up is tested for its BDV and the values recorded against drum no. The top, bottom and OLTC sample is taken and BDV recorded. If the above values are accepted, assembling of radiators and conservator tank can be started.

- It is recommended; the filling of oil shall be through a vacuum filtration plant with heating facilities and filtered. Oil shall be circulated at least 24 hrs or until oil temp reaches steady state value.

- BDV of oil is verified once the filtration plant is off and the value recorded. Once the transformer is cooled to ambient temp oil level is adjusted as per manufacturer’s recommendation.

- Trapped air in the main tank, radiators, OLTC tank is released through the air release plugs provided. All valves except sampling & drain valves shall be opened.

- HV, LV and Control cabling as applicable and terminations shall be completed as per approved schedule.

METHOD STATEMENT FOR INSTALLATION OF POWER TRANSFORMER

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- Earthing of transformer body and neutral shall be completed.

6.4 Verification Documents

- Approved Drawings

7.0 INSPECTION AND TESTING

- Transformer Visual inspection and Storage condition.

- Transformer installation inspection as per Construction Check Sheet for Power and Auxiliary Transformer Form No.11, 17.

- Transformer Pre-commissioning Tests as per Functional Test Sheet for Power and Auxiliary Transformer Form No 28, 35, and 36.

8.0 SAFETY

- Ensure that all PPE’s are available with the crew involved in the job.- All equipment and tools should be checked before starting of the activity for

suitability and integrity.- Ensure that housekeeping is being carried out before and after work on a daily

basis.