Installing inspection ports into switchboards has “switch board type testing” & insurance implications & therefore is not recommended. (Important – Don’t modify any switchboard without written authority from the manufacture & update your insurance).
Arc Flash Fatalities in WA(PDF) 196 KB
High Voltage Solutions (HVS) proactive clients who have contacted HVS in recent weeks are concerned about Long & Crawford (L&C) oil filled switches & how best to determine how safe they are for personnel to operate.
Expert Alliance Case Studies(PDF) 626 KB
Q: What do a roof collapse in Phoenix, a turbine breakdown in Belgium, a shipment of French wine damaged in transit on the Atlantic and a fire destroying an entire manufacturing facility in Argentina have in common?
A: You've seen it all and so have we.
Underground Mining Ventilation failures(PDF) 130 KB
A rigorous On-Line and Off-Line condition-monitoring program needs to be adopted to reduce risk of explosive failure for units in service beyond 15 years.
Corona Detection Services(PDF) 298 KB
UV inspection technology is being used for predictive maintenance of high voltage equipment together with IR-thermography and ultrasonic devices. The value added by UV inspection is reflected in its ability to pinpoint corona and arcing, pinpoint the location of a failure, predict unavoidable crises, display both the emitting objects and the emitted radiation, and assess severity of the case under inspection.
How Safe Is Your Switch Yard?(PDF) 440 KB
In service high-voltage (HV) substation equipment are exposed to electrical, mechanical, and thermal stresses as well as environmental conditions. All of these stresses can act to accelerate the deterioration of the insulation and hence the electrical integrity of theHV equipment eventually leading to failure.
With the aid of the latest technology, it is now possible to detect potential failures in CB Bushings and Tanks in-service / on-line, thereby preventing catastrophic arcing failure of both the bushings and rupture of the oil filled tank. Apart from the unplanned loss of supply and fire caused when a failure occurs, it has the potential to inflict serious harm to site personnel if they are in the vicinity of a porcelain bushing explosion.
With the downsizing and ageing of engineering staff of distribution companies, external technical support offered by specialised companies has become more important than ever before.
End of life decisions / life extension and cannibalism – which one?
Recently Power Quality Guidelines have been produced for the Electricity Engineers’ Association of New Zealand. Among the various power quality issues, this paper specifically presents the development of voltage harmonic planning levels in the medium voltage networks by applying the concept of voltage droop. These planning levels are used to determine how much harmonic current can be allocated to a customer. These levels are shown to be comparable with values from international standards.
All insulation systems require servicing in some form or another, and SF6 insulated systems are no exception. At time of manufacture and commission a great deal of care goes into ensuring no contamination has entered the sealed chambers and the system is leak free.
Substation Reliability(PDF) 330 KB
(INSTRUMENT TRANSFORMERS & CURRENT TRANSFORMERS) Increasing personnel safety within live switchyards is part of an asset owner 'Duty of care to their workers & contractors' Asset owners and or operations group are required to ensure the place of work is safe.
With the aid of the latest technology, it is now possible to detect potential failures in CB Bushings in-service / on-line, thereby preventing catastrophic arcing failure of the bushings. Apart from the unplanned loss of supply and fire caused when a failure occurs, it has the potential to inflict serious harm to site personnel if they are in the vicinity of a porcelain bushing explosion.
Discharge Testing Sefton Gel Filled Cable Boxes(PDF) 260 KB
It is now possible to detect potential failures in Sefton Gel filled transformer cable boxes in-service / on line. (Sefton Gel was commonly used in the 1970s to fill transformer cable boxes where paper lead cables were used).
How Safe is Your Switchboard?(PDF) 154 KB
To assist clients who are considering replacing switchgear or just wanting to know the actual condition of their HV switchgear, High Voltage Solution.Com (HVS) has developed an on-site audit process called Risk Based Inspection program.
Partial Discharge & Harmonic Surveys(PDF) 223 KB
For economic and other reasons, it is strategically important to be able to detect any fault that has started to appear in cables, terminations and switchboards. For example, a small problem can escalate quickly, causing considerable damage.
Discharge Testing on 33kV Indoor Terminations(PDF) 147 KB
It is now possible to rank your HV assets in order that are at the greatest risk of failing ensuring that the risks of substation outages are absolutely minimised. It is not acceptable to have an unplanned production stoppage due to a cable / switchgear or accessory failure.
To assist mining clients who are considering replacing switchgear or just wanting to know the actual condition of their HV switchgear, High Voltage Solution.Com (HVS) has developed an on-site audit process called Risk Based Inspection program.
“Identifying PD by testing in live substations is critical,” explains Peter Rhodes of High Voltage Solution. “Being able to monitor the condition of assets in a safe manner, without causing further outages or having to make special connections, is critical in situations such as Christchurch is currently experiencing.”
High Voltage Solution (HVS), headed by Peter Rhodes, one of Australasia’s leading consultants in High Voltage maintenance, is pleased to announce the roll out of additional Partial Discharge services on top of their already extensive range of standard services.
Getting the most life out of older switchgear(PDF) 313 KB
End of life decisions / Life extension and Cannibalism – which one?
On-Line Partial Discharge(PDF) 190 KB
Partial discharge testing can be performed online without requiring an outage and can be economically applied on all facility equipment in a survey fashion. By doing so, failures will be reduced, and reliability will be greatly enhanced.
On-Line Partial Discharge Cable Mapping(PDF) 74.6 KB
Without maintaining a periodic testing program all failures will come as a surprise, unplanned, inconvenient and quite possibly very expensive in time and resources.
On-Line Partial Discharge Testing(PDF) 197 KB
It is now possible to rank your HV assets in order that are at the greatest risk of failing ensuring that the risks of substation outages are absolutely minimised. It is not acceptable to have an unplanned production stoppage due to a cable or switchgear failure.
Detecting Partial Discharge(PDF) 245 KB
Detecting Partial Discharge (PD) requires extensive experience and equipment suitable to undertake measurements on live In-Service High Voltage Equipment.
In Service Testing(PDF) 234 KB
By having advanced warning of pending failures, a sound repair methodology can be implemented in a structured and timely manner resulting in significant cost savings.
On Line Partial Discharge Mapping(PDF) 220 KB
If diagnostic insulation testing had been included in the preventive maintenance program it may have been possible to plan maintenance or replacement of these cables at a time when the line was inactive thereby minimizing costs.
Using On-Line Partial Discharge Mapping
2005 - 2007
Anatomy of Partial Discharge Technology(PDF) 113 KB
One of Australia’s major international airports was experiencing random, insulation-based, cable termination/joint failures due to varying age of assets and different levels of maintenance. They now use On-Line Partial Discharge to improve electricity reliability.
The levels (magnitude and pulse rate) of partial discharge are a well known indicator of insulation quality and can provide information as to the expected life of the insulation.
Knowing and understanding the life of a high voltage asset requires a lifetime of experience and commitment.
Partial Discharge (PD) generally begins within voids, cracks, at conductor-dielectric interfaces within a solid insulation system, or in bubbles within liquid dielectrics. Since discharges are limited to only a portion of the insulation, the discharges only partially bridge the distance between electrodes. PD can also occur along the boundary between different insulating materials.
Partial Discharge in Insulation Systems(PDF) 619 KB
Eventually a complete breakdown path exists across the insulation and, unless the current is limited elsewhere, the cable suffers catastrophic damage.
Partial Discharge Mechanism(PDF) 47.8 KB
Partial Discharge prevention and detection are essential to insure reliable, long-term operation of high voltage equipment.
PD Monitoring for Condition Based Assets(PDF) 581 KB
By having advanced warning of pending failures, a sound repair methodology can be implemented in a structured and timely manner resulting in significant cost savings!
PD Monitoring for Condition Based Assets(PDF) 645 KB
The availability of an experienced On Line Partial Discharge Field Service Provider to undertake plant surveys on high voltage cables and switchgear while the plant is running is now a reality.
Oil filled cables that have been in-service for over 25 years are supposed to be bullet proof - that was 25 years ago. In 2005 we are now asking the same cable to do another 25 years but with more load, and with a decreasing availability of in-house expertise.
Being able to test live high voltage cables whilst in service and still meet all safety codes of practice!