Littelfuse Startco SE-330AU Neutral-Earthing-Resistor Monitors

SE-330AU Neutral-Earthing-Resistor Monitor

SE-330AU Neutral-Earthing-Resistor Monitor

Functions:

Detects neutral-earthing-resistor failure - NER failure will render current-sensing earth-fault protection inoperative
Detects earth faults
Data logging with PC software

Features:

Continuously measures NER resistance
Wide set-point ranges - compatible with any neutral-connected NER up to 35-kV system voltage
Calibrates to NER resistance
4-20 mA output for earth-leakage metering
DFT (harmonic) filter prevents false operation
Trip delay to coordinate with downstream ground-fault relays
Standard RS-232 interface
Optional DeviceNet, PROFIBUS, and Ethernet communications
Four output relays for control and indication
Conforms to AS/NZS 2081.3:2002
Conforms to CSA Standard M421-00 Use of Electricity in Mines
Free SE-MON330 PC-interface software
Conformally coated circuit boards
Five year warranty

Data Sheets:

SE-330AU Data Sheet

Manuals:

Typical Applications:

Resistance-earthed transformers and generators in mining facilities
NER monitoring is recommended for all resistance-earthed systems
The SE-330AU performs the series-neutral earth-leakage protection required by AS/NZS 2081.3:2002 and increases system reliability by also monitoring NER continuity

Minimum System Components:

The SE-330AU requires an EFCT-series or SE-CS30-series current transformer and a sensing resistor (ER-600VC, ER-5KV, ER-15KV, ER-25KV, or ER-35KV).
Outdoor Sensing Resistor Applications

IEEE Device Numbers:

3GC, 50G, 50N, 51G, 51N, 59N, 86

Accessories:

RK-332
Remote Indication and Reset Assembly
Remote indication and reset for the SE-330, SE-330AU, and SE-330HV. NEMA 4 and NEMA 13 rating. Standard 22-mm mounting.

SE-IP65CVR-G
Protective Cover
Allows relays to be used in a wet and dusty environment. Provides IP65 protection for the SE-13X- and SE-330-series relays, as well as the SE-400.

SE-330-SMA
Surface-Mount Adapter
Surface-mount adapter included with the SE-330 and SE-330HV, optional for the SE-330AU.

Current Transformers:

EFCT-26
Earth-Fault Current Transformer
Sensitive current transformer used to detect ground-fault current. Flux conditioner not required.

EFCT-1FC
EFCT Flux Conditioner
Helps prevent saturation when installed in the EFCT-1 window.

SE-CS30-70
Current Sensor
Current sensor used to detect ground-fault current.

EFCT-1
Earth-Fault Current Transformer
Sensitive current transformer used to detect ground-fault current. EFCT-1FC flux conditioner available.

SE-CS30-26
Current Sensor
Current sensor used to detect ground-fault current.

Sensing Resistors:

ER-600VC
1-kV Sensing Resistor
Used with the SE-325, SE-330, and SE-330AU to continuously monitor the continuity of a neutral-grounding resistor on systems up to 1 kVac.

ER-5KV
5-kV Sensing Resistor
Used with the SE-325, SE-330, and SE-330AU to continuously monitor the continuity of a neutral-grounding resistor on systems up to 5 kVac.

ER-15KV
15-kV Sensing Resistor
Used with the SE-325, SE-330, SE-330AU, and SE-330HV to continuously monitor the continuity of a neutral-grounding resistor on systems up to 15 kVac.

ER-35KV
35-kV Sensing Resistor
Used with the SE-330, SE-330AU, and SE-330HV to continuously monitor the continuity of a neutral-grounding resistor on systems up to 35 kVac.

SE-MRE-600
Moisture Resistant Enclosure Kit
Moisture-resistant enclosure specifically designed for the ER-600VC and ER-1000HV, which protects the connection terminals from snow and rain in outdoor applications.

ER-5WP
5-kV Weather-Protected Sensing Resistor
Used with the SE-325, SE-330, and SE-330AU to continuously monitor the continuity of a neutral-grounding resistor on systems up to 5 kVac. Comes with weather-protected terminals for outdoor installations.

ER-25KV
25-kV Sensing Resistor
Used with the SE-325, SE-330, SE-330AU, and SE-330HV to continuously monitor the continuity of a neutral-grounding resistor on systems up to 25 kVac.