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Tuesday, April 11, 2023 Fady El Hindawy_Gasco 11
ENGINEERING & TECHNICAL SUPPORT ENGINEERING & TECHNICAL SUPPORT DIVISIONDIVISION
ON-LINE & OFF-LINE CONDITION MONITORINGON-LINE & OFF-LINE CONDITION MONITORING
FOT ELECTRICAL MACHINESFOT ELECTRICAL MACHINES
January 2010January 2010
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Thermal Electrical Ambient (Environmental) Mechanical
On-Line & Off-Line PDA System
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On-Line & Off-Line PDA System
Partial discharges are plasma processes which take place generally in a gas. Whenever the electrical field in a gas space exceeds the inception field of the gas, partial discharges are created: on the surface of an insulator, due to conductive contamination, in air inclusions of the insulation as a result of mechanical forces. The gas plasma accelerates ageing and corrosive substances as ozoneand NO2 are created. However the mechanical wear or a surface contamination is usually more harmful than the partial discharge action. As the presence of partial discharges cannot be avoided in rotating machines insulation, mica is applied as a partial discharge resistant medium.By-products of the partial discharge are commonly white powders which can be found in many locations of the machines.
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On-Line & Off-Line PDA System
Typical Partial Discharge Phenomena in Rotating Machines
• Loose wedges/bar vibration/slot discharges• Cracked and broken conductors• End winding surface contamination• Damage and corrosion of the corona suppression system• Connection ring external discharge due to vibration• Inter-phase discharge• Insulation degradation• Collector ring, brush sparking• Faults in generator high voltage accessories
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Avoid unnecessary rewinds on older machines by maximizing the operating hours from a stator winding
Avoid unexpected in-service failures of the stator winding Find a problem and correct it before failure Find problems on new machines which may still be under
warranty Assess the quality of maintenance repairs and/or rewinds with
before and after readings Compare results from similar machines to focus maintenance
on those with higher levels of PD Identify specific failure mechanisms in the stator winding to
allow for corrective action prior to an outage Improve the overall reliability of motors & generators
On-Line & Off-Line PDA System
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Gasco’s PDA policy/process is govern
By the following: Maintenance & Inspection policy
IEC 60505: Evaluation and Qualification of Electrical
Insulation Systems
IEC 60505.pdf
On-Line & Off-Line PDA System
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It is to be noted that in the past On-Line PDA systems were supplied and installed by:New Oilfield Services: (2001) OEM being IRIS (CANADA) and the scope of work executed as follows:3 Generators ASAB, 3 Generators BUHASA, 3 Generators RUWAIS, 4 Generators BAB as well as 10 Motors RUWAIS and 5 Motors BAB.
PD Tech Gmbh: (2003) As OEM (SWISS) and the scope of work executed as follows:6 Motors ASAB and 2 Motors BUHASA
On-Line & Off-Line PDA System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 8
Scope of Work: Inspection report for GE 26V-101 unit.pdf
- Executing service of lead out cables
- Executing service of the RTD connection to the control system.
- Re-location of generator space heater to avoid fuming problem.
- Cryogenic cleaning due to dust and oily contaminations.
- GAC bus bars re-insulation & Stator re-wedging.
- PD system minor enhancement for increased system accuracy.
- Testing, Pre-commissioning and commissioning.
Bidders: Kanoo Group, New Oilfield Services , Cegelec, Oilfield
Equipment & Services, Gulf Industrial Services & IDC
On-Line & Off-Line PDA System
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Scope of Work:
On-line PDA System implementation – HABSHAN
- 3 units Fr 5 GE generators & 5 motors (Habshan)
- One motors (Bab)
On-line & Off-line PDA test for all GASCO’s plants (Long term agreement)
SCHEDULE OF CHARGES.pdf
Bidders: Kanoo Group, PD Tech Gmbh, New Oilfield Services, Omeir Bin Yousef and Sons & Electro Mechanical Company
On-Line & Off-Line PDA System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 10
Scope of Work:
- Executing service of lead out cables
- Executing service of the RTD connection to the control system.
- Re-location of generator space heater to avoid fuming problem.
- Cryogenic cleaning due to dust and oily contaminations.
- GAC bus bars re-insulation & Stator re-wedging.
- PD system minor enhancement for increased system accuracy.
- Testing, Pre-commissioning and commissioning.
Bidders: Emirates Holdings/GE, MJB & Cegelec OES_35_05_ Bid tabulation.pdf
On-Line & Off-Line PDA System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 11
Scope of Work:
- Executing service of lead out cables
- PD system minor enhancement for increased system accuracy.
- Testing, Pre-commissioning and commissioning.
Bidders: Quartzelec (ex. Cegelec)
On-Line & Off-Line PDA System
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Scope of Work:
On-Line PDA system implementation – PHASE II
- 11 motors
On-Line PDA system implementation – PHASE III
- 7 motors for HABSHAN ph III
- 2 GE Fr VI generators
Bidders: Target, Kanoo Group, New Oilfield Services & Cegelec,
On-Line & Off-Line PDA System
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Scope of Work:
- Executing service of lead out cables
- Executing service of the RTD connection to the control system.
- Re-location of generator space heater to avoid fuming problem.
- Cryogenic cleaning due to dust and oily contaminations.
- GAC bus bars re-insulation & Stator re-wedging.
- PD system minor enhancement for increased system accuracy.
- Testing, Pre-commissioning and commissioning.
Bidders: MJB & ADYARD
On-Line & Off-Line PDA System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 14
Scope of Work: SCOPE OF SERVICES.pdfOn-line & Off-line PDA consultancy services comprising the following- Data collection for each machine at site.- Report generation for each measurement for each machine.- Standard tests- Extra tests PDA consultancy services for the following machines:- 18 Generation units - 37 MotorsBidders: Target, MJB & Golden Falcon Petroleum Services, Kanoo Group & Yam Al Khaleej General Contracting Company
On-Line & Off-Line PDA System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 15
On-Line & Off-Line PDA System
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GASCO MAINTENANCE AND INSPECTION POLICYCHAPTER 7 - ELECTRICAL MAINTENANCE
Generators Inspection:
Special attention shall be given to the HV generators windings.In order to assess their condition on-line PDA should be performed regularly with a recommended interval of 6 months to 1 year. Data may be sent to Vendor's specialist for detailed analysis in case of abnormal data collected.
For the emergency generators which are not PDA tested a thorough visual inspection, insulation resistance check and polarization index measurement should be done on a regular basis with maximum interval of three years.
On-Line & Off-Line PDA System
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Electrical Monitoring & Inspection (By Gasco’s Staff)
Batteries Conditions (Cell Impedance Test)
PDA for HV & LV Switchgear (EA Tech devices)
Thermal Inspection for HV & LV Switchgear (Infrared Camera)
Motor Circuit Analyzer (MCA)
Electrical Cables Insulation conditions (EA Tech devices)
Other Electrical Monitoring System
Tuesday, April 11, 2023 Fady El Hindawy_Gasco 18
On-Line & Off-Line PDA System
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