Vishay Intertechnology, Inc. has introduced a new series of neutral ground resistors for industrial power systems. Consisting of the company’s GRE1 high-power, high-current grid resistors mounted in rugged, weatherproof IP23-rated enclosures with extremely high voltage insulation, Milwaukee Resistors (a product line of Vishay Dale Resistors) NGR series devices combine high line-neutral and system voltages with high-temperature performance to +760 degrees C.
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Offering a convenient drop-in replacement for competing solutions, NGR series resistors are designed to provide ground fault, overvoltage, and short circuit protection for generators and transformers in wye (star) configurations without exceeding the temperature limitations outlined by IEEE-32. The devices offer line-neutral voltage from 1.39kV to 8kV, system voltage from 2.4kV to 13.8kV, and current ratings from 100A to 1000A. Resistance for the resistors ranges from 1.39 Ω to 80 Ω with tolerance of ± 10%.
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