Use the NGR Monitor Set-Point Assistant to view recommended NGR monitor settings for your system. The recommended ground-fault trip setting assumes a tripping system. The ground-fault trip setting can be adjusted for other configurations.

Feel free to contact Littelfuse Startco with any questions or comments.

NGR Monitor Model
SE-325Economical NGR monitor for systems up to 25 kV
SE-330NGR monitor detecting open or shorted resistors up to 35 kV
SE-330AUAustralian NER monitor meeting requirements of AS/NZS 2081.3:2002
SE-330HVHigh-voltage NGR monitor for 15- to 72-kV systems
System Parameters
System Voltage
Line-to-LineVolts
Line-to-NeutralVolts
Neutral-Grounding Resistor
Let Through CurrentAmps
ResistanceOhms
Location
Current Transformer
*CT-Primary should approximate NGR Let Through Current
CT Selection
CT-Primary Rating
 
Recommendations
Sensing Resistor
Ground-Fault Trip Level
Vn Trip Level (Minimum)
*Do not set above line-to-neutral voltage
S5 Configuration Switch
Version 2.4
IMPORTANT NOTE: This set-point assistant is provided for purposes of example only. Littelfuse Startco does not assume responsibility for liability for use based upon the examples shown, and is not liable for contingent or consequential damages, or for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction. Littelfuse Startco relays have a wide variety of applications; those responsible for its application must take the necessary steps to assure that each installation meets all performance and safety requirements including any applicable laws, regulations, codes, and standards.
For more information about our NGR Assistant tool, please Contact Us.