PDF
Neutral Grounding Resistors

Neutral Grounding Resistors also called Low Resistance Grounding Resistor or Low Resistance Grounding, and Neutral Grounding Resistors Features & Capabilities are shown in the following content.

Low Resistance Grounding Resistor:
Neutral grounding resistor protect power transformers and generators from damaging fault currents. Neutral Grounding Resistors limit the ground fault current to a high level (usually 50 amps or more) so protective fault clearing relays and current transformers can operate properly. These devices are then able to quickly clear the fault, usually within a few seconds. The importance of this fast response time is that it:

Neutral Grounding Resistors

Neutral Grounding Resistors types:
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 prevent over-heating and mechanical stress on conductors. Like the solidly grounded neutral system, the circuit must be shut down after the first ground fault. Low resistance grounding resistors are typically rated between 100 and 400 amps for 10 seconds, and are commonly found on systems up to 34.5kv.

Neutral Grounding Resistors Features & Capabilities:
Neutral Grounding Resistors (NGRs) protect power transformers and generators from damaging fault currents
Available for systems rated 240v to 72kv line-line (CSA approved up to 7200v)
Current ratings up to 5000 amps. Designed and tested per IEEE32
Certified test reports and installation/maintenance instructions accompany each NGR
Standard enclosures are mill-galvanized. Optional enclosure finishes available, as well as CT’s, PT’s, & disconnect switches.

Low Resistance Grounding
The Industry's Most Commonly Used Neutral Grounding Resistors


Relative Articles:
Railroad insulators
Pollution, Creepage Distance, porcelain or Composite Insulators
Baroda bushing & insulator
High voltage pin insulator drawings and specifications
Spool insulator drawings and specifications

Orient is an international line post insulator manufacturer and supplier of high quality porcelain line post insulators and porcelain pin post insulator.
Copyright ©Zhengzhou Orient Power Co., Ltd. All Rights Reserved.     sales@orientinsulators.com     Tel: +86 13673997131