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.
For applications where existing switchgear is inaccessible or where a separate control panel is desirable, the SE-330 is also available within a NEMA 4X enclosure. The NGRM-ENC Series is available various options, including a surface-mounted or door-mounted SE-330, to fit the specific customer application.