The SE-330AU is an advanced earth-fault and earthing-resistor monitoring relay for low- and medium-voltage transformers and generators. It monitors neutral current, neutral-to-earth voltage, and neutral-to-earth resistance. It provides continuous monitoring of the neutral-to-earth path to verify that the neutral earthing resistor (NER) is intact. This is of utmost importance— an open NER renders current-sensing earth-fault protection inoperative and could result in a false belief that the system is functioning properly. The SE-330AU earth-fault function complies with AS/NZS 2081.3:2002. Outputs include four relay outputs, and an analog output. A mini USB port is included to view measured values, configure settings, and check event records. An on-board micro SD card can be used for long-term data logging. Network communications options are available. For non-AS/NZS 2081 applications, see the SE-330 or SE-330HV.
The SE-330AU combines the measured values of resistance, current, and voltage to continuously determine that the NER is intact. It is able to detect a resistor failure with or without an earth fault present. Sensing resistors are matched to the system voltage and are used to monitor NGRs on systems up to 35 kV.
The SE-330AU uses a 5- or 30-A-primary current transformer to provide a pickup-setting range of 0.125 to 5 A or 0.75 to 30 A to comply with AS/NZS 2081.3:2002. DFT filtering ensures that false trips due to harmonic noise from adjustable-speed drives do not occur. Open-CT detection is provided.
SE-330 PCN Document
SE-330AU Datasheet - New Revision
SE-330AU Datasheet - Previous Revision
SE-330AU Manual - New Revision
SE-330AU Manual - Previous Revision
SE 330 AU DeviceNet Electronic Datasheet EDS - New Revision
SE-330 AU DeviceNet Electronic Datasheet EDS - Previous Revision
SE-330 EthernetIP Electronic Data Sheet (.eds) - New Revision
SE-330 EthernetIP Electronic Data Sheet (.eds) - Previous Revision
SE-330 DeviceNet Manual - Previous Revision
SE-330 EthernetIP Manual - Previous Revision
SE-330 Profibus Manual - Previous Revision
- Input Voltage: See ordering information
- Dimensions: H 213 mm (8.4”), W 98 mm (3.9”), D 132 mm (5.2”)
- GF Trip-Level Settings: 0.125 to 30 A
- GF Trip-Time Settings: 0.1 to 0.5 s
- Vn Trip-Level Settings: 20-2,000 Vac (≤5 kV systems) 100-10,000 Vac (>5 kV systems)
- Output Contacts: Two Form A, Two Form C
- Operating Mode: Fail-Safe
- Harmonic Filtering: Standard feature
- Reset: Front panel push button and remote input
- Approvals: C-Tick (Australian), CE
- Communications: Mini USB (standard); DeviceNet (optional), IEC 61850 (optional), Modbus TCP and EtherNet/IP (optional)
- Analog Output: 4-20 mA, self or loop powered
- Conformal Coating: Standard feature
- Warranty: 5 years
- Mounting: Panel, Surface (optional)
|ORDERING NUMBER||POWER SUPPLY||COMM||K4 UNIT HEALTHY CONTACT|
SE-330AU for all apps. 35 kV or less
SE-330HV for 72 kV apps.
0=USB Only 1=DeviceNet
3=EtherNet (Dual RJ45)
4=EtherNet (SC Fiber & RJ45)
5=EtherNet (Dual SC Fiber)
6=IEC61850 (Dual RJ45)
7=IEC61850 (SC Fiber & RJ45)
8=IEC61850 (Dual SC Fiber)
|0=Normally Open 1=Normally Closed|
|ER Series Sensing Resistor||Required|
ER Series Sensing Resistor
Required interface between the power system and the SE-330AU. Eliminates hazardous voltage levels at the relay.
EFCT Series Earth-Fault Current Transformer
Sensitive earth-fault current detection (5 A primary).
SE-CS30 Series Earth-Fault Current Transformer
Sensitive earth-fault current detection (30 A primary).