M-3311A Transformer Protection
Two, Three or Four Winding Protection for Transformers of All Sizes
The M-3311A Transformer Protection System provides protection, control, monitoring and user interface functions for two, three or four-winding transformers. Includes restrained and unrestrained differential protection, overcurrent protection, and optional voltage, and underfrequency protection. Multiple setpoint groups and user-implementable logic schemes provide flexibility. Dual RS-232 ports and an RS-485 port provide user-interface capabilities. Optional modules include the HMI Module for front-panel operation, the Target Module to indicate trip target status and redundant power supply. The M-3311A can be purchased as a differential and overcurrent relay or with the Optional Voltage Protection Package. The IPScom® Communications Software is included for direct serial or remote communication access. Waveform data can be downloaded using IPScom®, while the M-3801D IPSplot® PLUS Oscillographic Analysis Software allows for plotting and printing of the downloaded oscillographic data.
Protective Functions: Base Package
ANSI
Function #
|
Description |
|
| 46 |
Negative Sequence Overcurrent |
|
| 49 |
Winding Thermal Protection |
|
| 50 |
Instantaneous Phase Overcurrent |
|
| 50BF |
Breaker Failure |
|
| 50G |
Instantaneous Ground Overcurrent |
|
| 50N |
Instantaneous Residual Overcurrent |
|
| 51 |
Inverse Time Phase Overcurrent |
|
| 51G |
Inverse Time Ground Overcurrent |
|
| 51N |
Inverse Time Residual Overcurrent |
|
| 87 |
Phase Differential Current |
|
| 87GD |
Ground Differential |
|
| IPS |
IPSlogic |
|
| TCM |
Trip (Aux Input) Circuit Monitor |
|
| BM |
Breaker Monitoring |
|
| TF |
Through Fault |
|
Protective Functions: Optional
Includes all Base Package functions, as well as the following:
ANSI
Function #
|
Description |
|
| 24 |
Volts/Hz Overexcitation |
|
| 27 |
Phase Undervoltage |
|
| 59 |
Phase Overvoltage |
|
| 59G |
Ground Overvoltage |
|
| 81O/U |
Overfrequency/Underfrequency |
|
| TCM |
Trip and Close Circuit Monitor (Expanded I/O Units) |
|
| CCM |
Close Circuit Monitor |
|
Standard Protective Functions
- Negative-sequence inverse time overcurrent (46)
- Winding thermal protection (49)
- Four winding instantaneous phase overcurrent (50)
- Breaker Failure (50BF)
- Instantaneous ground overcurrent (50G)
- Instantaneous residual overcurrent (50N)
- Four winding inverse time phase overcurrent (51)
- Inverse time ground overcurrent (51G)
- Inverse time residual overcurrent (51N)
- Two, three or four winding phase differential (87T) and high set instantaneous (87H)
- Ground differential (87GD)
- IPSlogic®
Optional Voltage Protection Package
- Overexcitation (24) V/Hz, two definite time and one inverse time elements
- Phase Undervoltage (27) function for load shedding
- Phase Overvoltage (59)
- Ground Overvoltage (59G)
- Over/Underfrequency (81O/U)
Standard Features
- Eight programmable outputs and six programmable inputs
- Oscillographic recording
- Through-Fault Monitoring
- 8-target storage
- Real time metering of measured and calculated parameters, including demand currents
- Two RS-232 and one RS-485 communications ports
- Standard 19" rack-mount design
- Removable printed circuit board and power supply
- 50 and 60 Hz models available
- 1 or 5 A rated CT inputs available
- IPScom® Communications Software
- IRIG-B time synchronization
- Sequence of Events Log
- Breaker Monitoring
- Multiple Setpoint Groups
- Trip Circuit Monitoring
- Includes MODBUS and DNP 3.0 protocols
- Summing Currents from multiple sources for 49, 50, 51, 50N, 51N, 87 GD and Through Fault functions
Optional Features
- Redundant Power Supply
- M-3911A Target Module
- M-3931 Human-Machine Interface (HMI) Module
- M-3801D IPSplot® Plus Oscillograph Analysis Software
- RJ45 Ethernet port utilizing MODBUS over TCP/IP, BECO 2200 over TCP/IP, IEC 61850 or DNP 3.0 protocol
- Expanded I/O (8 additional outputs and 12 additional inputs)
- Standard and Expanded I/O Models available in vertical panel mount
- Close Circuit Monitoring on Expanded I/O units
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