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Resistors And
Resistive Applications
NEUTRAL GROUNDING RESISTORS LOAD BANKS
INTRODUCTION
RARA Neutral Grounding Resistors are designed to provide added
safety to industrial distribution systems by limiting ground fault
current to reasonable levels. In a typical grounded three phase
system, the NGR is connected directly to the earth ground. This can
cause high ground fault current (typically 10,000 to 20,000 amps)
and excessive damage to transformers, generators, motors, wiring,
and associated equipment. Installing a RARA Neutral Grounding
Resistor between neutral and ground limits fault current to safe
levels while still allowing sufficient current flow to operate fault
clearing relays
- custom designed for your particular system
- durable, all stainless steel resistor elements
- elements are well insulated from ground for added safety
- corrosion resistant enclosures
- several stages of assembly depending on shipping needs
Product
Notes
Our NGR elements fall into three categories: Strip, edge wound and wire wound types. The dimensions of these
range from thicknesses of 0.6-2.5mm and widths from 4-100mm. The element type depends on the power of the
NGR. Our enclosuresv have voltage ratings from 0.2KV to 72KV and meet IEEE32. We can manufacturer NGRs
with IP ratings up to IP54 and NEMA ratings up to NEMA3S.
Characteristics of Metal Resistive Elements
- reliable electrical characteristics
- resistor contact points are spot or argon-welded eliminating contact defects
- high resistance to mechanical vibration
- advanced cutting and trimming technology ensures low resistance tolerance
- easy maintenance and verification
Minimum Information Needed for Model Selection
- voltage rating [KV/R3]
- current rating [A]
- time rating [sec.]
- resistance [ohms]
- indoor/outdoor
- ambient environmental conditions
Website : http://www.raraohm.com Email : sg@raraohm.com