Erection and Commissioning of Medium Voltage Motors by Suppliers

1. PURPOSE – This technical specification is about requirements for the complete erection and commissioning by the supplier of medium voltage motors.

2. SCOPE

This technical specification applies to medium voltage (3000 volts and above) motors for plants where Company is responsible for site construction.

3. RELATED DOCUMENTS

International Electrotechnical Commission (IEC)

61936     Power Installations exceeding 1 kV a.c. Part 1

4. Medium Voltage Motors Erection

4.1    The supplier’s responsibilities shall include the following:

• Providing at site the services of a specialist supervisor together with all skilled and unskilled labour necessary to execute the complete erection of the motor.
• Providing stub shaft, lifting beam, motor slings and all tools, as necessary.

Note: Company will provide crane facilities.

• Responsibility for the correct grouting of foundation bolts and doweling of stator and bearings.
• The final settings and alignment of the motor and associated driven machine to the mutual satisfaction of the motor supplier, driven equipment supplier, and Company .

4.2      On completion of the erection work, the supplier must submit to Company , an Erection Certificate providing details of all mechanical alignment and clearance settings. This shall include the following data as a minimum:

1. Stator-rotor air gap dimensions.
2. Bearing clearance dimensions.
3. Stator-rotor magnetic centre dimensions.
4. 4. Shaft and coupling alignment and concentricity dimensions.

The Erection Certificate shall be formally transmitted by e-mail in Adobe Acrobat electronic format, (.pdf) to the Company resident site engineer for record.

4.3      In addition, the Erection Certificate shall confirm that all ancillary equipment is fitted on the motor (for example, instruments, protection switches, heaters, and valves).

5.  Medium Voltage Motors Commissioning

5.1      The supplier’s responsibilities shall include the following:

• Providing at site the services of a specialist engineer together with all assistants necessary to execute the complete commissioning of the motor.
• Providing all test instruments and tools necessary for commissioning work. The Supplier shall give prior notification of the test equipment that is proposed to be used during the test, and shall make available at site copies of the test equipment calibration certificates.
• The final commissioning run of the motor and associated driven machine to the mutual satisfaction of the motor supplier, driven equipment supplier, and Company .

5.2      On completion of commissioning work, the supplier must submit to Company a Commissioning Certificate for the motor, giving details of all electrical test results, performance figures, and instrument settings. The minimum data requirements shall be as follows:

1. Winding insulation resistance values
2. Protection switch contact set point values
3. Motor performance figures recorded during initial starts and commissioning runs (including vibration measurements).

The Commissioning Certificate shall be formally transmitted by e-mail in Adobe Acrobat electronic format, (.pdf) to the Company commissioning engineer for record.

5.3      In addition, the Commissioning Certificate shall confirm that all associated ancillary equipment is correct and satisfactory, in terms of installation and operation (for example, external cable connections, external piping connections, operation of lubricating system, operation of cooling system, and operation of instruments, protection switches, heaters, and valves).

5.4      On completion of the commissioning activities, copies of protection relay setting programs or software used during the commissioning of synchronous motor excitation panels or speed/vibration sensors shall be formally transmitted by e-mail to the Company commissioning engineer for record.

5.5      If any defects or deficiencies still exist at the time the supplier’s commissioning engineer leaves site, these must be listed in full detail and formally transmitted by e-mail to the Company resident site engineer.

6. GENERAL

Where the formal transmittal by e-mail of any documentation is not possible, two hard copies may be formally handed over with a transmittal or covering letter to the Company engineer for record.

Erection and Commissioning of Medium Voltage Switchgear by Suppliers