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RESISTORS

Neutral Grounding Resistors

Resistance-grounding systems for industrial power networks, used to limit single-phase ground-fault current while retaining sufficient current for protective relays.

LMZ neutral grounding resistor equipment, transparent product photograph from official catalog
TECHNICAL OVERVIEW

Purpose and operating principle.

Neutral Grounding Resistors are generally connected between ground and the neutral point of transformers, generators or grounding transformers. Their purpose is to limit maximum fault current to a level that protects power-system equipment while allowing protection devices to clear the fault.

APPLICATION

MV grounding

ELEMENTS

Stainless steel

CURRENT TRANSFORMER

EN 60044-1

ENCLOSURE

Typically 2 mm HDG steel

KEY FEATURES

Project-relevant characteristics and selection points.

Reduces single-phase fault current to help prevent damage to transformers and generators.

Reduces temporary overvoltages associated with ground faults.

Helps extend switchgear service life.

Reduces step voltage to safer levels for personnel.

Bolted resistor-element connections allow rapid on-site spare-part replacement.

High thermal capacity, high-altitude ratings and rugged shock-resistant construction.

RESISTOR SYSTEMS

Electrical and thermal duty define the final resistor configuration.

LMZ resistor systems are selected around the network, current, voltage, thermal duty, operating cycle and environmental requirements of the application.

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