35KV接地变及变压器中性点接地电阻柜含发电机电阻柜

     Introduction:
Neutral Earthing resistor systems protect power transformers andgenerators 
from damaging fault currents. Earthing of the neutral limits theground fault current 
to a high level (typically 50 amps or more) in order to operateprotective fault 
clearing relays and current transformers. These devices are thenable to quickly 
clear the fault, usually within a few seconds. The importance ofthis fast response 
time is that it:
· Limits damage to equipment
· Prevents additional faults from occurring
· Provides safety for personnel
· Localizes the fault
· UL Listed
· CSA approved up to 7200v
· Seismic Zone 4 Certifications and type tests also available
The limited fault current and fast response time also preventover-heating and mechanical stress on conductors. 
Please note that, like the solidly 
earthed neutral system, the circuit must be shut down after thefirst ground fault. 
Neutral Earthing Resistors are typically rated 400 amps for 10seconds, and are 
commonly found on medium and high voltage systems.
 II Features & Capabilities:
· Neutral Earthing Resistors protect power transformers andgenerators from 
damaging fault currents
· Available for systems rated 240v to 72kv line-line (CSA approvedup to 7200v)
· Stamped stainless steel grid or edgewound design
· Current ratings up to 5000 amps
· All Neutral Earthing Resistors designed and tested perIEEE32
· Certified test reports and installation/maintenance instructionsaccompany each 
Neutral Earthing Resistor
· Standard ventilated enclosures are painted or mill-galvanized,with stainless steel, hot-dipped galvanized, and aluminum asoptions
·  Package CTs, PTs, disconnect switches, earthingtransformers, 
and heaters in the Neutral Earthing Resistor cubicle
· Seismic zone 4 certifications and type tests also available
· Technical papers on the theories of Resistance Earthing readilyavailable