CPM 311
Digital Multifunction Modular Type Current Protection Relay
DEMA proudly presents the users and modern networks a solid alternative for overcurrent protection with CPM 311; with the state-of-art electronic, physical and functional technology for use with (X/5) A or (X/1) A conventional type current transformers. As a DSP based digital multi-function protection & control relay with 3 phase & earth overcurrent protection, DEMA CPM 311 is tested to fulfill international standards' requirements; and provides the users numerous assembly, commissioning and service advantages.
CPM 311 comprises a main unit, a control unit and an interconnection cable. The unique design of the product eliminates the need to extend the CT secondary, command and control cabling to the panel door - instead, the product utilizes a communications cable with RJ45 termination to provide communication between the main unit and control unit for the first time in the world; enabling easy and fast relay cabling.
- General Features
- Documents
- 360 View
- Softwares
MV | HV |
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Wide range IEC, ANSI and Special curves
5 Input, 4 Output
8 Programmable Virtual Led
9 INFO LED
Visualisation of activated functions on main screen (2 Group)
Function Test without using Relay Test Set
Visibility of R-S-T-N currents from 1,5 - 2 m distance thanks to the large LCD Screen (128 x 64 px)
1-5 A Current transformer flexibility in usage
Blocking Selectivity by delaying previous breaker
Electro-magnetic compatibility tested for IEC directives,
Temperature/Buchholz/Pressure Protection
Remote or local Alarm-Reset
SCADA ready
Displaying Alarm and Fault Records with one click
Circuit Breaker trip/close
RS485 communication
- MODBUS RTU
- IEC60870-5-103
USB (front port) communication
IP52 and IP20 protection for front and rear panel respectively
FUNCTION | ANSI CODE | CPM 311 |
Phase Overcurrent | 50/51 P | 3 thresholds |
Earth Overcurrent | 50/51N | 3 thresholds |
Negative Sequence | ||
Overcurrent Protection | 46 | 2 thresholds |
Undercurrent Protection | 37 | 1 thresholds |
Thermal Overload Protection | 49 | 2 thresholds |
Automatic reclosing | 79 | 4 shot |
Broken Conductor Detection | 46BC | |
Breaker Failure Settings | 50BF | |
Cold Load Pickup | CLPU-50/50N | |
Latching | 86 | |
Trip Circuit Supervision | 74TCS | |
Blocking Relay | 68 |
RMS Current Measurement
Max Rms Current Meas.
Fundemental Current Meas.
P/N Sequences Current Meas.
Thermal (θ) Measurements
Circuit Breaker Monitoring
Automatic reclosing Meas.
Event Records
Fault Records
Alarm Records
Comtrade Waveform Records
RS485 communication
- MODBUS RTU
- IEC60870-5-103
USB (front port) communication
Other Products