T&D World Magazine
Noja recloser

Upgraded Recloser Passes Type Test for 16-kA Maximum Interrupt Rating

This represents a significant upgrade on the previous product certification for a rating of 12.5 kA.

NOJA Power's OSM15 310 series 15-kV Automatic Circuit Recloser has been type-tested by an independent test laboratory for compliance with IEC62271-111 and IEEE C37.60 standards for a 16-kA maximum interrupt rating. This represents a significant upgrade on the previous product certification for a rating of 12.5 kA. The product was also tested and passed compliance for a short time withstand current of 16 kA for three seconds.

The OSM15 310 series was introduced in April 2014 to replace older products with units capable of a rated maximum voltage of 15.5 kV and rated maximum continuous current of 800 A. The enhanced ACRs are suitable for use in a wider range of electrical network configuration options for conventional grids and smart grids.

Previously, NOJA Power’s OSM15 310 series ACRs had been subjected to full type testing and certification by independent test laboratory DNV GL KEMA of The Netherlands. The original certification included a 12.5-kA maximum interrupt rating and maximum continuous current of 630 A. The new type testing by DNV GL KEMA proves the capability of the OSM15 310 series ACR at a 16-kA maximum interrupt rating, maximum continuous current of 800 A and short time withstand current test of 16 kA for three seconds.

Type Test Certificates with a gold label issued by DNV GL KEMA confirm that NOJA Power’s ACRs comply with international standards such as IEC62271-111 and IEEE C37.60. These Type Test Certificates are the only documents which certify that medium-voltage switchgear products such as ACRs (and other components used in systems for the transmission and distribution of electrical energy) have completed and passed testing to verify that they meet international standards.

NOJA Power’s OSM15 310 series products benefit from the use of a vacuum interrupt and solid dielectric insulator instead of the environmentally unfriendly oil or sulphur hexafluoride (SF6) gas used in older products. Another key feature of the OSM15 310 series is its stainless steel enclosure that forms the only solid dielectric unit with controlled arc venting on the market. The controlled arc venting design meets the requirements of IEC62271-200 Clause 6.106 and Annex A, and the efficacy of this important safety feature has previously been verified as part of the type-testing certification.

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