tel : 82-32-817-4325 r esistors a nd fax : 82-32-817-4329 r esistive a pplications website : http://www.raraohm.com email : sg@raraohm.com 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 sufficie nt 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 0.2k v 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 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 ` 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).
tel : 82-32-817-4325 r esistors a nd fax : 82-32-817-4329 r esistive a pplications 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)
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