变压器中性点接地电阻柜

Neutral grounding resistor

1. About us:

Baoding TIanwei Hengtong Electric company isadomestic professional manufacture of power system neutralearthingequipments and complete implements ISO9001 qualitymanagementsystem. We have a excellent sales performance all overthe worldand have been exported to more than 40 countries.

2. Principles:

THT-ZT Neutral Grounding Resistors are designed to provideaddedsafety to industrial distribution systems by limiting groundfaultcurrent to reasonable levels. In a typical solidly groundedthreephase system, the neutral is tied directly to earth ground.Thiscan cause high ground fault current (typically 10,000 to20,000amps) and excessive damage to transformers, generators,motors,wiring, and associated equipment. Inserting an THT-ZTNeutralGrounding Resistor between neutral and ground limits faultcurrentto a safe level (typically 25 to 400 amps) while stillallowingsufficient current flow to operate fault clearingrelays.

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 IEEEStandard32

4.2High efficiency of electric conductivityandhigh-temperature endurance nichrome resistor

4.3Corrosion resistant aluminizedzincsteel,stainless steel,cold-roll steel enclosures.

4.4Corrosion resistant stainless steelA2-70screws

4.4 LZZBJ9 resin casting insulation enhancedtypecurrent transformer

4.5 Hidden binding structure Air-cooling system

4.6 Sealed cubicle with highest protection levelofIP55.

4.7 Intellect controlled unit realize theunattendedoperation  

4.8 Fully factory assembled - no fieldassemblyrequired

4.9 A zigzag connecting grounding transformerisneeded when the transformer windings adopt delta connection.

5. Regular Technical Particulars for reference

Notes: manufactures various resistors according to thecustomer’srequirement, the design inaccuracy is ±3%, the flowtime isvarious 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 andthetransformation ratio (if applicable)

6.7Material of the enclosure:aluminized zincsteel,stainlesssteel or cold-roll steel

6.8IP protectional grade

6.9Color

6.10Installing place

6.11Line mode.