Link has been copied to clipboard
The SE-330HV series is an advanced ground-fault and neutral-grounding-resistor monitoring relay that is compliant with Rule 10-302 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. A unique LED flashing code provides external confirmation for plant safety teams and inspectors when standards-compliant protection has been configured and is active.
The SE-330HV 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 applications above 25 kV and below, use the SE-330. For applications that require conformance to Australian/New Zealand standard AS/NZS 2081, use the SE-330AU.
Complete setup of the SE-330HV requires connection to a PC running SE-MON330 software v4.10 or higher. There are three available protocol options for network communications:
- IEC 61850 - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface
- Modbus TCP and Ethernet/IP - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface
- DeviceNet - with CAN interface
The SE-330/SE-330HV combines the measured values of resistance, current, and voltage to continuously determine that an NGR is intact. It is able to detect an open or shorted resistor with or without a ground fault present. Sensing resistors are matched to the system voltage and are used to monitor NGRs on systems up to 72 kV.
Ground-Fault Monitoring
The SE-330/SE-330HV uses an application-appropriate current transformer to reliably detect ground-fault currents as small as 100 mA. Discrete-Fourier Transform (DFT) filtering ensures that false trips due to harmonic noise from adjustable-speed drives do not occur. Should the resistor open and a ground fault subsequently occur, the SE-330 will detect the fault through voltage measurement while other current-only sensing relays would be ineffective.
Pulsing Ground-Fault Location
The SE-330/SE-330HV is capable of controlling a pulsing contactor, which is used to switch the NGR resistance in a pulsing-compatible NGR package. The resulting ground-fault current is distinguishable from charging currents and noise and will only appear upstream of the ground fault, making fault location fast and easy, even without isolating feeders or interrupting loads.
- Continuous NGR monitoring
- Shorted NGR detection
- Ground-fault detection
- Adjustable pickup (2–100 %)
- Adjustable time delay (0.1–10 s)
- Universal CT compatibility
- Programmable output contacts
- Selectable contact operating mode
- Analog output (4–20 mA)
- Pulsing output (SE-330 only)
- Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of ground-fault detection failure
- Detects a ground fault on the neutral that could bypass the resistor, ensures fault current is not higher than expected
- Main or backup protection to detect a ground fault anywhere on the monitored system
- Select greatest sensitivity without false operation, adjustable in 1 % increments
- Adjustable trip delay allows quick protection and system coordination
- Allows use of a CT that gives required ground-fault settings
- Two programmable Form C and one programmable Form A (Ground Fault, Resistor Fault, Unit Health)
- Selectable fail-safe or non-fail-safe operating modes allow connection to shunt or undervoltage breaker coil or alarm circuit (K1-3 output contacts)
- Connect an optional PGA-0520 meter or control system
- Control the operation of a pulsing ground-fault-location circuit
SE-330HV Parts
Link has been copied to clipboard
Filters
SE-330HV Applications
- Resistance-grounded systems
