neutral grounding resistor
1. about us:
baoding tianwei hengtong electric company is adomestic professional manufacture of power system neutral earthingequipments and complete implements iso9001 quality managementsystem. we have a excellent sales performance all over the worldand have been exported to more than 40 countries.
2. principles:
tht-zt neutral grounding resistors are designed to provide addedsafety to industrial distribution systems by limiting ground faultcurrent to reasonable levels. in a typical solidly grounded threephase system, the neutral is tied directly to earth ground. thiscan cause high ground fault current (typically 10,000 to 20,000amps) and excessive damage to transformers, generators, motors,wiring, and associated equipment. inserting an tht-zt neutralgrounding resistor between neutral and ground limits fault currentto a safe level (typically 25 to 400 amps) while still allowingsufficient current flow to operate fault clearing relays.
3. service conditions:
3.1 ambient temperature: -40°c~60°c
3.2 altitude: less than 4000m
3.3 relative humidity: less than 95% (25°c)
3.4 rated frequency: 50/60hz
3.5 location: outdoor/indoor
4. characteristics:
4.1designed in strict accordance with ieee standard32
4.2high efficiency of electric conductivity andhigh-temperature endurance nichrome resistor
4.3corrosion resistant aluminized zincsteel,stainless steel,cold-roll steel enclosures.
4.4corrosion resistant stainless steel a2-70screws
4.4 lzzbj9 resin casting insulation enhanced typecurrent transformer
4.5 hidden binding structure air-cooling system
4.6 sealed cubicle with highest protection level ofip55.
4.7 intellect controlled unit realize theunattended operation
4.8 fully factory assembled - no field assemblyrequired
4.9 a zigzag connecting grounding transformer isneeded when the transformer windings adopt delta connection.
5. regular technical particulars for reference
 type
rated voltage(kv)
short time current(a)
flow time (s)
resistance value(ω)
outer dimensions(mm)
tht-zt-6/34.64
6
100
10
34.64
1200x1200x1870
tht-zt-6/17.32
6
200
10
17.32
1200x1200x1870
tht-zt-6/8.66
6
400
10
8.66
1200x1200x1870
tht-zt-6/5.77
6
600
10
5.77
1200x1200x1870
tht-zt-10/14.43
10
400
10
14.43
1200x1200x1870
tht-zt-10/9.62
10
600
10
9.62
1200x1200x1870
tht-zt-10/7.22
10
800
10
7.22
1200x1200x1870
tht-zt-10/5.77
10
1000
10
5.77
1200x1200x1870
tht-zt-35/20.21
35
1000
10
20.21
2760x2600x2000
tht-zt-35/10.10
35
2000
10
10.10
2760x2600x2000
notes: manufactures various resistors according to thecustomer’s requirement, the design inaccuracy is ±3%, the flowtime is various from 10s, 15s,30s, 60s,2h.
6.  information needed to quote:
6.1system voltage
6.2line-to-neutral voltage
6.3current rating
6.4maximum time on
6.5current transformer ratio, capacity (if applicable)
6.6grounding transformer kva rating, connection symbol and thetransformation ratio (if applicable)
6.7material of the enclosure:aluminized zinc steel,stainlesssteel or cold-roll steel
6.8ip protectional grade
6.9color
6.10installing place
6.11line mode.
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保定天威恒通电气有限公司
李亚杰
312-03120312
北二环5699号大学科技园B区7号楼3层