الوصف

1. About us:
Baoding TIanwei Hengtong Electric company is a domestic professional manufacture of power system neutral earthing equipments and complete implements ISO***1 quality management system. We have a excellent sales performance all over the world and have been exported to more than *0 countries. 

2. Principles:
THT-ZT Neutral Grounding Resistors are designed to provide added safety to industrial distribution systems by limiting ground fault current to reasonable levels. In a typical solidly grounded three phase system, the neutral is tied directly to earth ground. This can cause high ground fault current (typically *0,**0 to *0,**0 amps) and excessive damage to transformers, generators, motors, wiring, and associated equipment. Inserting an THT-ZT Neutral Grounding Resistor between neutral and ground limits fault current to a safe level (typically *5 to **0 amps) while still allowing sufficient current flow to operate fault clearing relays. 

3. Service conditions:
3.1 Ambient temperature: **0°C~*0°C
3.2 Altitude: less than ***0m
3.3 Relative humidity: less than *5% (*5°C)
3.4 Rated frequency: *0/*0HZ
3.5 Location: outdoor/indoor

4. Characteristics:
4.1Designed in strict accordance with IEEE Standard *2
4.2High efficiency of electric conductivity and high-temperature endurance nichrome resistor
4.3Corrosion resistantaluminized zinc steel,stainless steel,cold-roll steel enclosures.
4.4Corrosion resistant stainless steel A***0 screws
4.4 LZZBJ9 resin casting insulation enhanced type current transformer
4.5 Hidden binding structure Air-cooling system 
4.6 Sealed cubicle with highest protection level of IP*5. 
4.7 Intellect controlled unit realize the unattended operation  
4.8 Fully factory assembled - no field assembly required
4.9 A zigzag connecting grounding transformer is needed when the transformer windings adopt delta connection.  

5. Regular Technical Particulars for reference

Notes: manufactures various resistors according to the customers requirement, the design inaccuracy is ±3%, the flow time is various from *0s, *5s,*0s, *0s,2h. 

6. Information needed to quote: 

6.1 System Voltage

6.2 Line-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 the transformation ratio (if applicable)

6.7Material of the enclosure:aluminized zinc steel,stainless steel or cold-roll steel

6.8IP protectional grade

6.9Color

6.*0Installing place

6.*1 Line mode.