Corona Tracking Arcing in Switchgears Transformers
Corona/ Tracking/ Arcing in Switchgears, Circuit Breakers, Transformers, Insulators, Potheads, Junction Boxes, Panels
Our Product: We render our services in ‘Inspection of Switch Yards, HT Panels for Corona, Tracking, and Arcing Detection’.
These inspections are of Switch Yards, HT panels are inside of companies or Switchyards/ Substations.
Partial Discharge testing can be conducted on medium voltage switchgear with a voltage range of 3.3kV to 36kV and is suitable for both solid insulated switchgear (SIS) and air-insulated switchgear (AIS).
As this is online detection process, it can be done on any day at any time of the day. There is no need to take any shutdowns. The only requirement is that the system should be loaded nearly to its full load capacity.
Procedure:
Our Product: We render our services in ‘Inspection of Switch Yards, HT Panels for Corona, Tracking, and Arcing Detection’.
These inspections are of Switch Yards, HT panels are inside of companies or Switchyards/ Substations.
Partial Discharge testing can be conducted on medium voltage switchgear with a voltage range of 3.3kV to 36kV and is suitable for both solid insulated switchgear (SIS) and air-insulated switchgear (AIS).
As this is online detection process, it can be done on any day at any time of the day. There is no need to take any shutdowns. The only requirement is that the system should be loaded nearly to its full load capacity.
Procedure:
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You have to schedule the inspection as per your suitability.
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Our expert team will carry out the inspection of the given Transformers, Switch yards, Substations, HT Panels, CT/PT’s etc at your place.
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The points of tracking / corona / arcing will be identified and noted down.
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Our expert will then photograph the part of fault area and the exact position of fault be marked on the photograph. Wherever possible (Panels) the faulty areas will be tagged.
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Detailed reports will be submitted after inspection.
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The photographs will be submitted along with report to show the exact position of faults.
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The corrective actions & suggestions will be given in the submitted reports.
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Verification Survey will be carried out after correction of faults/ anomalies.
(We can take corrective actions for you in behalf of you)
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I feel far too many electrical inspectors are ignoring the 800-pound gorilla in the room named Corona. They are also ignoring the use of ultrasound for electrical inspections. Yes, it’s a hard stance.
So, let’s start with simple theory. Imagine a picture illustrating sound waves that are moving through the air, vibrating over great distances. These waves are known as sonic waves. The number of sonic waves determines the frequency.
In general, most humans hear in the range from 20 Hz to as high as 20 kilohertz (kHz). Ultrasound is sound above 20,000 Hz.
When performing an ultrasonic electrical inspection, the ultrasound technician may select 40 kHz to detect an electrical anomaly (sound waves moving through the air). However, if background noise or other competing sounds are present, raising or lowering the frequency 1 kHz to 3 kHz may limit the interference, allowing the user to detect and define the electrical anomaly.
Online Partial Discharge Testing: Online Partial Discharge Testing is performed online without disrupting plant or facility operations. This nondestructive, non-invasive predictive maintenance tool assesses the condition of switchgear, feeder cables, and bus duct to provide critical information regarding the levels of partial discharge and its potential impact on the health of the electrical asset. The cost to perform online testing is relatively inexpensive compared with offline testing that requires interruption of service and production.
Problems Identification: Using our Integrated Partial Discharge Testing and Monitoring Solutions, our test engineers can identify:
• Surface Tracking
• Corona
• Partial discharges within insulators and insulating components
• Defective insulation in cable terminations
• Surface contamination or moisture
• Defective potential transformers and current transformers
• Defects in circuit breaker insulation structure
So, let’s start with simple theory. Imagine a picture illustrating sound waves that are moving through the air, vibrating over great distances. These waves are known as sonic waves. The number of sonic waves determines the frequency.
In general, most humans hear in the range from 20 Hz to as high as 20 kilohertz (kHz). Ultrasound is sound above 20,000 Hz.
When performing an ultrasonic electrical inspection, the ultrasound technician may select 40 kHz to detect an electrical anomaly (sound waves moving through the air). However, if background noise or other competing sounds are present, raising or lowering the frequency 1 kHz to 3 kHz may limit the interference, allowing the user to detect and define the electrical anomaly.
Online Partial Discharge Testing: Online Partial Discharge Testing is performed online without disrupting plant or facility operations. This nondestructive, non-invasive predictive maintenance tool assesses the condition of switchgear, feeder cables, and bus duct to provide critical information regarding the levels of partial discharge and its potential impact on the health of the electrical asset. The cost to perform online testing is relatively inexpensive compared with offline testing that requires interruption of service and production.
Problems Identification: Using our Integrated Partial Discharge Testing and Monitoring Solutions, our test engineers can identify:
• Surface Tracking
• Corona
• Partial discharges within insulators and insulating components
• Defective insulation in cable terminations
• Surface contamination or moisture
• Defective potential transformers and current transformers
• Defects in circuit breaker insulation structure
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Corona activity advancing to the tracking stage on insulation board resting on 13kV bus
Notice the carbon deposits and light brown discoloration of the insulation board insulation board on the right
Notice the carbon deposits and light brown discoloration of the insulation board insulation board on the right