Earth fault algorithm for recloser controller

Nola Power has released an upgrade to its recloser controller firmware and introduced an optional Cos Phi algorithm to the existing earth fault protection suite. Although the OSM recloser system with RC control already possesses a high resolution SEF capability, with pickup from 200 mA SEF, the inclusion of the Cos Phi algorithm provides greater precision in compensated neutral networks with respect to directional protection. The Cos Phi earth fault algorithm in the recloser’s controller provides protection engineers with the capability to achieve improved performance goals. The Cos Phi algorithm implementation is further enhanced by an upgrade in selecting operating ranges for relay characteristic angles in directional protection. Improving the accuracy of the operating range for a directional relay allows protection engineers to mitigate the risk of spurious tripping of SEF under high impedance fault conditions.

Contact John Dykes, Noja Power, johnd@nojapower.co.uk

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Source: EE plublishers

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