DEMA CPM 310 G User Manual

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General Specifications & Advantages
DEMA proudly presents the users and modern networks a solid alternative for overcurrent protection
with CPM 310 G; 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
1
based digital multi-function protection
& control relay with 3 phase & earth overcurrent protection, DEMA CPM 310 G is tested to fulfill
international standards requirements; and provides the users numerous assembly, commissioning and
service advantages.
DEMA CPM 310 G Digital Overcurrent Protection Relays are type tested in internationally accredited
laboratories to comply with IEC 60255, IEC 60529, IEC 60695 and IEC 60068 standards, and have
been introduced into service under the guarantee of ISO9001:2008.
The general specifications of CPM 310 G are listed below to create a common sense for the product.
All functions CPM 310 G offers will be examined thoroughly throughout this manual.
Function
ANSI Code
CPM 310 G
Phase Overcurrent – Instantaneous Trip
50
3 thresholds
Phase Overcurrent – Delayed Trip
51
3 thresholds
Earth Overcurrent – Instantaneous Trip
50N
3 thresholds
Earth Overcurrent – Delayed Trip
51N
3 thresholds
Restricted Earth Fault Protection
64N
3 thresholds
Thermal Overload Protection
49
2 thresholds
Undercurrent Protection
37
1 threshold
Negative Sequence Overcurrent Protection
46
2 thresholds
Latching
86

Circuit Breaker Failure Detection
50BF

Auto-reclosing
79
4-shot
Broken Conductor Detection
46 BC

Temperature / Buchholz Protection
26 / 63

Cold Load Pickup Function

Settings Groups
2 groups
Trip Circuit Supervision
TCS

Circuit Breaker Supervision and Control

Blocking Logic Selectivity

Delaying Logic Selectivity

On Screen CB ON / OFF commanding

Optic-coupled Inputs
7
Outputs (Total / SPDT / SPST)
8 / 4 / 4
Disturbance Waveform Recording
5 x 3 s
Event and Fault Records
150 records
Communication Ports
USB + RS485
(X/1) A & (X/5) A CT compatibility

Frequency and Current Measurements

Thermal Image Measurements
Positive and Negative Sequence Current Measurements

Auto-recloser Measurements

Watchdog

Self-Function-Testing

1
DSP: Digital Signal Processor.

DEMA CPM 310 G Specifications

General

Brand	DEMA
Model	CPM 310 G
Category	Relays
Language	English