SE-330 Series Neutral Grounding Resistor Monitor

The SE-330 is an advanced ground-fault and neutral-grounding resistor

monitoring relay that is compliant with Rule10-302 of the

2018 Canadian Electrical Code Part I (CE Code). It measures neutral

current, neutral-to-ground voltage, and neutral-to-ground resistance.

It provides continuous monitoring of the neutral-to-ground path to

verify that the neutral-grounding resistor (NGR) is intact and that it

has not been bypassed or shorted. An open NGR renders current sensing

ground-fault protection inoperative and could result in a false

belief that the system is functioning properly. A shorted NGR results

in higher-than-expected ground-fault current. The SE-330 can be used

with low- and medium-voltage transformers and generators with

low- or high-resistance grounding used in processing, manufacturing,

chemical, pulp and paper, petroleum, and water-treatment facilities.

For high-voltage applications, use the SE-330HV. For applications that

require conformance to Australian standard AS/NZS 2081.3:2002,

use the SE-330AU.