Power Transformer (SAT) Site Acceptance Test Procedure | Method Statement

1.0 PURPOSE

To ensure that site acceptance testing are performed safely, efficiently and in accordance with good working practice, as per Saudi Aramco Job Specifications..

2.0 SCOPE

This Method Statement defines the requirements for site acceptance testing of Transformer in commercial buildings, plants and refineries.

List of perform Site Acceptance Test (SAT):
1) JX-XXX-XFR (T) XXX -50/60.7MVA 132/13.8/kV.

3.0 DEFINITION

4.1 Saudi Aramco Engineering Standard

SAES-B-068 : Electrical Area Classification
SAES-P-100 : Basic Power System Design Criteria
SAES-P-104 : Wiring Methods and Materials
SAES-P-111 : Grounding
SAES-P-121 : Transformers and Reactors

4.2 Saudi Aramco Inspection Test Plan

SATIP-P-121-02 – Power Transformers (235 kV or >2.5 MVA)

4.3 Saudi Aramco Inspection Checklist (SAIC)

SAIC-P-3926 Assembled Transformer Jobsite Testing (Before Energization) Precommissioning and Energization

SAIC-P-3731 Electrical System Grounding Ground Electrode Conductor and Main Bonding Jumper Installation Visual Inspection for Power Transformer Grounding

4.4 Saudi Aramco Test Report (SATR)

SATR-P-3912 Assembled Transformer Jobsite Testing(Before Energization)
SATR-P-3217 Power Cable Termination Torque Testing
SATR-P-3218 Very High-Potential Dielectric Withstand Testing (Installed Cable)
SATR-P-3801 Protection Relay, and Circuit Breaker Trip Unit Testing & Setting for Energization Certificate
SATR-P-3702 Ground Electrode System Grid Resistance Testing (Installed Grid) for GES Resistance Test (IEEE 81)
SATR-P-3704 Equipment Grounding/ Bonding, Supplementary Grounding, and Electrical System Grounding Ground Continuity Testing (Installed Cable)
SATR-P-3706 Equipment Grounding/ Bonding, Supplementary Grounding, and Electrical System Grounding Cable Termination Torque Testing

4.5 Pre-Commisioning Form

Form No. P-011 Instrument Transformers
Form No. P-051 Oil Filled Power Transformers

5.0 RESPONSIBILITIES

5.1 Site Manager

Site Manager is responsible for supporting and encouraging the related staffs and workers, so as for them to participate actively as worksite. Site Manager is responsible for implementation of HSE requirements.

5.2 Construction Manager

Construction Manager is responsible for compliance with this Method Statement and shall ensure to review contract documents and provide all resources necessary to effectively implement throughout the construction period. Construction Manager shall monitor the quality and progress of the work and ensure that job target is achieved. Construction Manager is responsible for complying with HSE requirements.

5.3 Electrical Supervisor

The Electrical Supervisor shall be responsible for construction work supervision, work permit, conducting TSTI and ensuring that work is completed in conformity with drawings and specifications.

5.4 QA/QC Manager

QA/QC Manager has the overall responsibility for all QA/QC activities of the project. He shall be interacting with Site Manager related to all QA/QC activities. He shall be responsible for Nonconformance Management and Quality Audit.

5.5 QA/QC Inspectors

QA/QC Inspectors shall be responsible for Site QA/QC activities, in co-ordination with HSE team for cable testing works at site.

5.6 HSE Manager

HSE Manager shall monitor related works under carrying out, and advise supervisors for corrective measures, if required. He shall ensure holding of pre task HSE meeting /daily tool box talks covering details of specific tasks and specific job risks involved to the work force involved. He shall also ensure appropriate mode of communication in case of emergency.

6.0 TOOLS and EQUIPMENT

6.1 General Tools

• Pipe wrench
• Adjustable wrenches
• Ratchet wrenches
• Double offset wrenches
• Open ended spanners
• Screw drivers
• Cross-point screw drivers
• Level gauge
• Pliers
• Crimping pliers for insulated AMP terminals
• Torque wrenches
• Hand lamp
• Knives
• Hammer, etc
6.2 Testing Instrument
• Voltmeter, Ammeter, Ohmmeter, AC/DC 500V, 10 A, Cl:1 (one multi instrument)
• Megger DC:0.5-1-2.5-5 kV with accessories
• Oil tester: 2.5 mm spherical electrodes gap, voltage increase 2kV/section. (acc.to IEC- 156), min 60 kV
• Dry battery above 6 V
• Thermometer

• Electric heater with oil bath
• Power supply 3 x 380 V with supply cable 4×2.5 mm2.

7.0 WORK SEQUENCE PROCEDURE

7.1 Pre-Testing Activities

7.1.1 Ensure that all materials, accessories and consumables shall be prepared and checked prior to commencing with the work.
7.1.2 Manpower, tools and other logistics are ready and prepared for the work. Ensure that all personnel are qualified to perform the work and are fully familiar with the tools and equipment to be utilised.
7.1.3 Ensure that all test equipment to be utilised is newly calibrated.
7.1.4 Ensure that all relevant documents have been approved by contractor and Aramco prior to commencing with the work, and that specification, manufacturer’s instructions/factory test reports, including approved procedures are disseminated to concerned personnel who will carry out the work.
7.1.5 Ensure that work permits are obtained prior to proceeding with the work in the area, and are available to the working crew.
7.1.6 Ensure safety barriers are erected at designated work areas.
7.1.7 Always refer to instruction manuals of equipment under test and the test equipment to be utilised for detailed safety instructions and precautions.
7.1.8 Inspect, test transformers and record test results per approved Aramco Installation/Test Checklist.
7.1.9 Test shall comply with the manufacturer’s instructions and referenced international standards.
7.1.10 Compare the test results to the acceptable results given in the manufacturer’s factory test record.
7.1.11 Record ambient temperature for correction of test data.
7.2 Acceptance Testing and Energization Procedure (by Vendor Documents) shall be followed. See on Attachment page.

To Proceed for complete testing and site acceptance test SAT Procedure of Power Transfer please check out following articles.

POWER TRANSFORMER TESTING ON SITE (SITE ACCEPTANCE TEST SAT TRANSFORMER)

Porcedure for Energization of Transformer

9.0 QUALITY CONTROL

Inspection shall be performed by the project approved Quality Control Inspector (QCI) and witness point shall be coordinated with the Contractor and Company.

10.0 SAFETY PRECAUTIONS:

10.1 Barricade the working area.
10.2 All safety precautionary signboards must be visibly posted.
10.3 Wear full body harness when working at heights and hook-up (100% tie-off).
10.4 Ensure that only authorized personnel are within the affected area.
10.5 The work shall be executed with the approved Risk Safety Analysis (RSA).
10.6 Maintained RSA at worksite by work Supervisor, requirements shall be discussed in daily TSTI. (See attachment)
10.7 Ensure valid HOT WORK PERMIT is signed prior to commencing splicing and personnel had undergone work at height training.

11.0 ATTACHMENT

Attachment 1: Job Hazard and Risk Assessment (JHRA).
Attachment 2: V-2181-003-B-802 Rev. 01 Sat Procedure.
Attachment 3: Form No. P-011 Instrument Transformers.
Attachment 4: Form No. P-051 Oil Filled Power Transformers March 2006.
Attachment 5:
SATR-P-3912 Assembled Transformer Jobsite Testing(Before Energization).
SATR-P-3217 Power Cable Termination Torque Testing.
SATR-P-3218 Very High-Potential Dielectric Withstand Testing (Installed Cable).
SATR-P-3801 Protection Relay, and Circuit Breaker Trip Unit Testing & Setting for Energization Certificate .
SATR-P-3702 Ground Electrode System Grid Resistance Testing (Installed Grid) for GES Resistance Test (IEEE 81).
SATR-P-3704 Equipment Grounding/ Bonding, Supplementary Grounding, and Electrical System Grounding Ground Continuity Testing (Installed Cable).
SATR-P-3706 Equipment Grounding / Bonding, Supplementary Grounding, and Electrical System Grounding Cable Termination Torque Testing.