Switchgear Pre-commissioning

Switchgear pre-installation inspection

Pastikan equipment certificate meet area classification requirement

Remove temporary weather proofing, transport packing, and silica gel drying agent from switchgear, Cek cleanliness di dalam switchgear, specially for insulator

Compare switchgear equipment meets equipment schedule, specially rating and any circuit changes

Pastikan equipment meets spec, including weather, dust and vermin proofing

Switchgear post-installation inspection

Check switchboard assy for alignment, level, tighteness foundation bolts and fixing in general

Pastikan all panel doors and gland plate are bonded to switchboard structure

Pastikan all equipment installed in switch board are in good conditions

Inspect busbar joint

Pastikan all insulators are clean, free from damage and not subjected to undue mechanical stress

Cek all items corresponded to material list

Cek all damages items

Clearence phase to phase and phase to earth are acordance with spec

Section clearances are satisfactory

Earthing connection connected to all necessary points and clear of other metal

Earthing connection tight, greased and thinned as required. Inspect the switchboard earth bar and earth cable for electrical and mechanical continuity

Confirm all earth runs connected to main grid

Labels correct/fitted

Manufacturers name plate/marker correct/fitted

Serial numbers match manufacturers test certificates

Primary connection assembly /jointing compound, no undue stress/tension on equipment, fitting bolt correctly tensioned

No dissimilar metals employed on primary connections

No rust on equipment

Site surfacing is correct and satisfactory

All fixing bolts are tight

No leaking impregnation fluid or swelling of containers

Ensure all manufacturer’s document and test certificate have been received

Operation of locking facilities

Cable entry arrangments

Ensure all equipments meet specification weather, dust and vermin proofing after installation

Examine fuses for rupturing or signs of deterioration

Switchborad testing

After all busbar joints are completed but prior to securely fitting busbar covers, measure insulation resistance of the busbars and control wiring.

Where there are any busbar joints, ductor test must be carried out prior to fitting covers. Simillar joints shall have a contact resistance within 10% of each other. The joints shall have a resistance equal or lower than an equivalent section of busbar

Test switch board earth system for electrical dan mechanical continuity. Measure earth path resistance at the earth bar to the general earth system and earth bar joints

Ensure that all protection relay have been tested accrdance with requirement of appropriate test certificate and vendor instruction

Measure insulation testing of busbar and control wiring. Test should be carrued out prior to pressure test and before energising switchboard. Minimum acceptabe test result as below. A Power frequency voltage test (pressure test) on both main and outgoing cicuits sall be carried out phases and phases to earth.

Switchgear Pre-commissioning

Following conection shall be adhered for the tests

All secondary sides of current transformers shall be short circuit
All secodary sides of voltage transformer shall be open circuit
upon completion all tests, reconnect all cables and ensure that shorting links and fuses are replace

(source:roni.sartika.blogspot.com)