View Filnor's Standard Neutral Grounding Resistors
Neutral Grounding Resistors are used to protect power transformers, power generators and other associated equipment in your power systems against 50/60 Hz faults (short circuit) and transient phenomena (lightning).
There are three parameters needed to specify the neutral grounding resistor.
1. Rated voltage line to neutral or system voltage
2. Rated fault current
3. Rated time on of the line to neutral voltage not exceeding the allowable temperature rise.
Rated current: from 1 amp to 5000 A
Rated voltage: from 0.38 to 34.5kV
Rated time: 1 sec to continuous time rating
TESTING AND QUALITY
All Filnor Neutral Grounding Resistors are designed, rated, manufactured and tested in strict compliance with IEEE-32. Routine tests performed on each Neutral Grounding Resistor are measurement of resistance, high voltage power frequency, insulation measurement, aspect verification, dimensional control. Filnors internal quality system has been developed and certified under ISO 9001 quality system.
Standard unit includes the stainless steel resistor assembly plus all the required insulators, internal connections and hardware installed in a standard safety enclosure. Neutral Grounding Resistor units are completely assembled, prewired, and tested at our facility. For shipping all units are crated for added protection and ease of handling.
Solid overhung top slightly sloped to prevent standing water and will support heavy ice and snow.
Forged eyebolts in all four corners for easy hoisting.
Removable front and rear louvered covers for easy access for connection and inspection.
Corrosion resistant nameplate provides complete ratings and manufacturers information.
Mill galvinized finish provides maximum protection.
Bottom screening prevents the entry of birds and rodents while providing maximum cooling for the resistors.
Mill galvanized, aluminum, stainless steel and hot-dipped galvanized construction. Custom paint finish is available.
Top or side mounted entrance bushing(s).
Screened covers for indoor applications.
Support stands for elevating the enclosure above ground.
Current or potential transformers mounted and prewired at our facility
ON or OFF Load disconnecting switches
Specially designed units for hazardous or high altitude locations
Ordering Information Required
NEUTRAL GROUNDING RESISTORS
• Rated voltage line to neutral or system voltage
• Rated fault current
• Rated “time on” of the line to neutral voltage
• Enclosure type (NEMA 1 or NEMA 3R)
• Designed and Tested to IEEE-32 Standard
• Space for Current Transformer
• Enclosure: Nema 3R Outdoor Mill Galvinized Finish
• Internal Terminal Connections