Description

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 customer’s 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

6.3   Current Rating

6.4   Maximum Time On

6.5   Current Transformer Ratio, capacity (if applicable)

6.6   Grounding Transformer KVA Rating, connection symbol and the transformation ratio (if applicable)

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

6.8   IP protectional grade

6.9    Color

6.*0 Installing place

6.*1  Line mode.