RMI D Motor protection and control
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RMI D is a powerful Protection and Control IED for large (> 2 MW) asynchronous and synchronous Motors. It is also suitable for medium (from 0.5 to 2 MW) and small sized (from 0.1 to 0.5 MW) motors, where directional earth fault, voltage and frequency functions are necessary.
RMI D can be used also as a basic generator protection unit.
The protection is suitable for all types of current transformers -iron-core and linearized (Rogowski coil).
Relay protection functions***
- Optional motor differential protection
- Starting time supervision
- Number of starts limitation
- Stalled Rotor Protection function
- Loss of load protection
- Cooling failure protection
- Loss of field/Under excitation
- Over excitation
- Four stages directional/non-directional definite time/instantaneous overcurrent protection
- Directional/non-directional Inverse time overcurrent protection with 12 inverse time characteristics
- Four stages directional/non-directional definite time/instantaneous ground fault protection
- Directional/non-directional Inverse time ground fault protection with 12 inverse time characteristics
- Definite time undercurrent protection
- Negative Sequence overcurrent protection
- Phase discontinuity detection
- Three stages definite time over voltage protection
- Three stages definite time under voltage protection
- Two stages negative sequence over voltage protection
- Directional overpower protection
- Directional underpower protection
- Three stages neutral voltage displacement
- Four stages definite time over frequency protection
- Four stages definite time under frequency protection
- Four stages definite time rate of change of frequency protection
- Thermal overload protection
- Arc protection
- Fuse failure monitoring
- Voltage balance protection
- Breaker failure protection
- Clockwise and anticlockwise phase rotation function
- Trip circuits supervision
- Current circuits supervision functions
- Circuit breaker life time monitoring
*** All relay protection functions meet all ANSI and IEC standards' requirements.
Automation and remote control functions
Disturbance (Fault) Recorder
- Sampling rate – 1 kHz/2 kHz
- User defined trigger conditions and records duration
- Recording mode -overwrite (ring buffer) or saturate
- Each sample consists of instantaneous values of all analog and digital values
- File format – COMTRADE
- Sampling rate – 50 Hz / 10 Hz / 1 Hz
- User defined trigger conditions, records duration and values
- The function could be enabled or disabled
- Recording mode -overwrite (ring buffer)
- Each sample contains RMS values of all selected analog values
- File format – COMTRADE
Event Recorder
- Up to 1000 records
- Each event consists of information about the event’s type, some additional data (such as pick-up current, voltage, the time elapsed and so on) and the time stamp of the event (year, month, day, hour, minute, second, millisecond)
- Recording mode – overwrite
Protocols
- SCADA communication - IEC 61850, IEC 60870-5-103, IEC 60870-5-104, MODBUS RTU/TCP
- Configuration tool - ROCON MMI protocol
- Web-based interface - HTTP
- Time synchronization - PTP (IEEE 1588), NTP / SNTP, IRIG-B or PPS
- File system access – FTP
Configuration, setting and administration
- ROCON MMI D
- Web server
Options
- Optional extension with I/O modules.
