HOME   INTRO   HISTORY   PRODUCTS   NEWS

NEUTRAL GROUNDING
RESISTORS

Download
PDF File

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 enclosures
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

AISI-304 Neutral Grounding Resistors

RATED VOLTAGE
(Line to Neutral)

440/℃3V

3.3/℃3kV
3.45/℃3kV 

RATED CURRENT

TEMP. RISE(”)

10SEC

30SEC

10SEC

30SEC

 50A

750

GRL-501S

GRL-503S

GR3H-501S

GR3H-503S

350

GRL-501T

GRL-503T

GR3H-501T

GR3H-503T

100A

750

GRL-1001S

GRL-1003S

GR3H-1001S

GR3H-1003S

350

GRL-1001T

GRL-1003T

GR3H-1001T

GR3H-1003T

200A

750

   

GR3H-2001S

GR3H-2003S

350

   

GR3H-2001T

GR3H-2003T

300A

750

       

350

       
400A

750

       

350

       
500A

750

       

350

       

 

RATED VOLTAGE
(Line to Neutral)

6.6/℃3kV
6.9/℃3kV 

22/℃3kV
22.9/℃3kV 

RATED CURRENT

TEMP. RISE(”)

10SEC

30SEC

10SEC

30SEC

 50A

750

GR7H-501S

GR7H-503S

GR24H-501S

GR24H-503S

350

GR7H-501T

GR7H-503T

GR24H-501T

GR24H-503T

100A

750

GR7H-1001S

GR7H-1003S

GR24H-1001S

GR24H-1003S

350

GR7H-1001T

GR7H-1003T

GR24H-1001T

GR24H-1003T

200A

750

GR7H-2001S

GR7H-2003S

GR24H-2001S

GR24H-2003S

350

GR7H-2001T

GR7H-2003T

GR24H-2001T

GR24H-2003T

300A

750

GR7H-3001S

GR7H-3003S

GR24H-3001S

GR24H-3003S

350

GR7H-3001T

GR7H-3003T

GR24H-3001T

GR24H-3003T

400A

750

GR7H-4001S

GR7H-4003S

GR24H-4001S

GR24H-4003S

350

GR7H-4001T

GR7H-4003T

GR24H-4001T

GR24H-4003T

500A

750

   

GR24H-5001S

GR24H-5003S

350

   

GR24H-5001T

GR24H-5003T

1.
Resistance (R) = Line to neutral voltage (V) / Rated current (I) - Tolerance : ‐10 percent

2.
Power frequency withstand test(One minute)
-Rated 600V or less :  <2 X Line voltage> + 1000V
-Rated over 600V :  <2.25 X Line voltage> + 2000V

3.
Listed neutral grounding resistors are designed, tested, and rated in accordance with ANSI/IEEE
Std 32-1972 (Reaffirmed 1990).

AISI-304 Neutral Grounding Resistors Dimensions

Model Dimensions(mm) Model Dimensions(mm)

W

D H W D H

G R L -

501S, 503S

500

420

160

G R 7 H -

3001T

640

690

1120

G R L -

501T, 503T

640

420

160

G R 7 H -

3003S

640

690

1120

G R L -

1001S & 3S

640

420

160

G R 7 H -

3003T

640

780

1580

G R L -

1001T & 3T

640

420

160

G R 7 H -

4001S

640

600

660

 

     

G R 7 H -

4001T

640

690

1120

G R 3 H -

501S

640

600

350

G R 7 H -

4003S

640

690

1120

G R 3 H -

501T

640

780

350

G R 7 H -

4003T

640

1140

1580

G R 3 H -

503S

640

780

350

         

G R 3 H -

503T

640

600

580

G R 24 H -

501S

780

780

1110

G R 3 H -

1001S

640

600

350

G R 24 H -

501T

780

870

1340

G R 3 H -

1001T

640

780

350

G R 24 H -

503S

780

870

1340

G R 3 H -

1003S

640

780

350

G R 24 H -

503T

780

870

1800

G R 3 H -

1003T

640

600

580

G R 24 H -

1001S

780

780

1110

G R 3 H -

2001S

640

600

350

G R 24 H -

1001T

780

870

1340

G R 3 H -

2001T

640

780

350

G R 24 H -

1003S

780

870

1340

G R 3 H -

2003S

640

780

350

G R 24 H -

1003T

780

870

1800

G R 3 H -

2003T

640

690

810

G R 24 H -

2001S

780

780

1110

 

 

 

 

 

G R 24 H -

2001T

780

870

1340

G R 7 H -

501S

640

600

660

G R 24 H -

2003S

780

870

1340

G R 7 H -

501T

640

780

660

G R 24 H -

2003T

780

1410

1800

G R 7 H -

503S

640

780

660

G R 24 H -

3001S

780

780

1110

G R 7 H -

503T

640

600

1120

G R 24 H -

3001T

780

960

1800

G R 7 H -

1001S

640

600

660

G R 24 H -

3003S

780

960

1800

G R 7 H -

1001T

640

780

660

G R 24 H -

3003T

780

1410

1800

G R 7 H -

1003S

640

780

660

G R 24 H -

4001S

780

780

1110

G R 7 H -

1003T

640

600

1120

G R 24 H -

4001T

780

960

1800

G R 7 H -

2001S

640

600

660

G R 24 H -

4003S

780

960

1800

G R 7 H -

2001T

640

780

660

G R 24 H -

4003T

780

1410

Note1

G R 7 H -

2003S

640

780

660

G R 24 H -

5001S

780

870

1340

G R 7 H -

2003T

640

690

1580

G R 24 H -

5001T

780

960

1800

G R 7 H -

3001S

640

510

660

G R 24 H -

5003S

780

960

1800

         

G R 24 H -

5003T

780

1410

Note1

Note1:  1800 + 1800 (mm)

Copyright 1999-2005, RARA Electronics Corporation
Tel:82-32-817-4325 Fax:82-32-817-4329

Rara electronics Sitemap Rara electronics main contents
Home
Intro
History
News
Email
Wirewound
Power Film
SMD
RF
Current Sensing
Precision
High Voltage
NGR, Load Bank, Motor Control
Inductors
Circuit Protection

Wire Wound Resistors


High Power Shunt Resistors


Current Sensing resistors


Metal Clad Resistors


Loadbanks


High Power Resistors


High Voltage Resistors


High Precision Resistors


Precision Power Resistors


Thick Film Resistors


Precision Thin Film Resistors


Rara Eletronics

rotary potentiometers


variable resistor potentiometer


rotary potentiometer manufacturers


rotary potentiometer switch


single turn potentiometer


control potentiometer


carbon potentiometers


ceramic composition resistors


ceramic composition resistor


ceramic power resistors


resistor ceramic


rotary dip switches

dip switch settings


3 position dip switch


dip switch manufacturer


dip swich


mini rotary switch


high power shunt resistors


loadbanks