Distribution 20KV NGRs Neutral Grounding Resistors Protecting Transformer

1. Neutral Grounding Resistor Standards Carried-Out:

DI/780 -2001
distribution system neutral grounding resistor

GB6450
dry-type power transformer

DI/T620-1997
Overvoltage protection and insulation coordination of AC electrical equipment

GB/T16927-1997
high voltage testing technology

GB1208-1997
current transformer

GB4208-93
case protection grade

IEEE32-1972
Technologies ,terms, and experiments of neutral grounding equipments

GB311.1-1997
insulation coordination of high voltage transmission and distribution device

DL/T593-1996
common ordering technical conditions of high voltage switch device



GB50150-1991
standards of electrical equipment handing-over and experiment of electrical device installment project




2.Operation Conditions:

1. Mostly applied outdoor in system of 50Hz and 60Hz

2. Max Altitude is 3500m. Because of high altitude and bad thermal discharging in plateau, please indicate in order if in this situation.

3. Ambient Temp is between -20°C~+70°C and relative humidity does not excess 95%.

4. Wind pressure does not excess 700Mpa (equivalent to 34m/s)

5. Earthquake intensity is less than 8 degree.

6. Thickness of ice coverage is less than 10mm

7. Air dusty grade is not higher than IV grade

8. No corrosive or explosive gas and conductive dust around installation site.

9. As the resistor is a heat generating component, it should be installed in place with some space left around, and be away from heat source.
Quantity Per Month: 50 sets
Patent No./Country: MADE IN CHINA
Delivery Way - Date Of Delivery: 20-30 days