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Neutral Grounding Resistor (NRA)
The neutral grounding resistor is a current limiting electrical protection device connected between the neutral points of the generator and transformer. In case of failure in the power network, the neutral voltage will produce an offset, especially in a grid system of cables whose capacitive earth current is high, arc grounding overvoltage will be produced when the current is greater than the specified value so that the non-fault phase-to-ground voltage will be greatly increased, the equipment insulation will be damaged, thus causing short circuit of earthing at two or more points and power outage. 
Detail

■  Product Introduction

The neutral grounding resistor is a current limiting electrical protection device connected between the neutral points of the generator and transformer. In case of failure in the power network, the neutral voltage will produce an offset, especially in a grid system of cables whose capacitive earth current is high, arc grounding overvoltage will be produced when the current is greater than the specified value so that the non-fault phase-to-ground voltage will be greatly increased, the equipment insulation will be damaged, thus causing short circuit of earthing at two or more points and power outage. 

■   Product Application

      The device is suitable for use in the dead earthed neutral system of a distribution network of 0.4-110kV voltage level. 

■  Applicable Standards)

      GB/T5729-1994  

■  Product Size

                                             

   规格     电压   电流 组织范围R 尺寸(L)     W         H    
NRA 6.3 50-1000A 3-72Ω 850 1000 1500
NRA 10.5 50-2000A 3-121Ω 1000 1000 2000
NRA 20 50-2000A 5-230Ω 1500 2000 2200
NRA 35 50-2000A 10-404Ω 1600 2500 2500

*Remark:Dimension can be customization

■  Product Identification Code

            
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