Our Mission Statement
"We offer our customers integrated solutions using innovative products combined with unrivalled service and reliability world wide"
Type Test
NOJA Power provide high quality, quality assured medium voltage recloser related products and services to an international market
Exhaustive testing during our design process coupled with rigorous routine testing ensures that NOJA Power products meet our customers' expectations in every respect.
NOJA Power also Type Tests its products at independent testing laboratories such as KEMA in the Netherlands. To see a list of type tests performed by KEMA, click the link below.
The new Impulse Test Laboratory is capable of simulating lightning strikes and switching surges in accordance to IEC, ANSI/IEEE international standards. The Impulse Voltage generator is rated at 300 kV (15 kJ) and simulates lightning impulse waveform of 1.2/50 µs.
These in-house facilities provide flexibility to examine and improve existing product design and prove new prototype design concepts which greatly reduces the time and cost of development.
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The new Salt Fog Test Laboratory monitors and logs the level of applied voltage, frequency, leakage current, ambient temperature and humidity. Leakage current levels generated by the test objects are automatically recorded for review. This allows Engineers to test against quality standards such as IEC61109 2008 and IEC62217.
The laboratory enclosure is built using graded stainless steel, with glass windows on all four sides to allow Engineers to carefully inspect the test objects. Fog is generated inside the enclosure using ultra sonic mist makers that are able to consistently generate droplets within 5-10 microns. A fan installed within the enclosure ensures the fog density is kept uniform around the test objects.
Levels of salinity are kept within the specified tolerance and are continually monitored and adjusted accordingly.
The main applied voltage can be set to approximately 20kV and is kept within the 5% tolerance set by the standard with the use of an Automatic Voltage Regulator.
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Recloser Solid Dielectric Arc Fault Containment & Venting
Reclosers were first invented in the 1940’s. They utilised oil interruption and oil insulation inside heavy mild steel tanks that contained faults in the event of internal arc faults.
The next generation of reclosers utilised SF6 gas which were contained inside pressure vessels which also contained arc faults in the event of internal faults.
Globally it is recognized that both oil and SF6 gas have undesirable environmental impact and the majority of utilities are eliminating their use in pole mounted switchgear today.
Thus solid dielectric switchgear has been invented and is available from a variety of recloser manufacturers today. However these products utilise solid dielectric technologies that do not provide arc fault containment and venting. From a safety perspective this is a backward step compared to previous generations in our view.
Today our electricity utilities are practising more live line installations and maintenance activities and require staff to approach energised switchgear more regularly.
It is therefore more important today than ever to have switchgear that is arc fault contained and vented in accordance with the requirements of IEC62271-200-2003 Clause 6.106 and Annex A.
The NOJA Power OSM range of reclosers which offer environmentally friendly solid dielectric installation have been designed and type tested to provide this important safety feature.
Arc fault containment testing conducted on the OSM200 Series product at Test & Certification Australia in Sydney 2009.
The NOJA Power OSM range of reclosers have successfully passed the arc fault containment type test and have complied to the 5 criterion below:
Criterion No. 1
- Correctly secured doors and covers do not open.
Criterion No. 2
- No fragmentation of the enclosure occurs within the time specified for the test.
- Projections of small parts, up to an individual mass of 60 g.
Criterion No. 3
- Arcing does not cause holes in the accessible sides up to a height of 2 m.
Criterion No. 4
- Indicators do not ignite due to the effect of hot gases. Pictures taken by high-speed cameras, video or any other suitable means can be used by the test laboratory to establish evidence.
Criterion No. 5
- The enclosure remains connected to its earthing point.
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