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Neutral grounding resistors

MRD-BJ

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Description

Neutral grounding resistors are used in industrial distribution system for resistance grounding or connected transformer and generators.

Limiting fault current to a reasonable level limits the fault current to a value which is sufficient enough to operate protective relays limits damage to equipment provides safety for personnel.

General

Designed and tested with IEEE32-1972
All stainless steel resistor elements
Current transformer included EN60044-1
Epoxy based electrostatic powder painted hot-dip galvanized or stainless stain enclosure
All part factory assembled. No field assembly required
Meets seismic zone 4 requirements

Technical specifications
Operation voltage: up to 72kV line to line
Rated current: up to 2000A
Ambient temperature :< 55
Resistor elements: stainless steel
Protection degree: IP00-IP54

Options
Motorized-manual disconnector
Header thermostat
Vacuum contactor
Elastimold bushing input
Current-voltage transformer
Relays
External bushing

Enclosure features

2mm hot-dip galvanized or stainless steel
Assemblies are available IP00 or IP55
Required color RAL 70XX
Solid steel one piece top
Inox eyebolt for handling ease

Tests
Total DC resistance
Withstand test of dielectric strength
Resistor block insulation test
Insulation resistance measurement between N-G
Paint and galvanized thickness test

Information needed to quotation
All custom design are available

System voltage
Line to neutral voltage
Current rating
Resistance level
Maximum time ON (sec.)
Bushing/cable-open or enclosed
Current transformer ratio (if applicable)
Grounding transformer KVA rating (if

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