DEMA CPM 310 G, User Manual

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General Specifications & Advantages

Wide IEC, ANSI and custom delay curve support,

DMT and IDMT delay curve support for all overcurrent protection functions,

Annunciating functions and 7 optically coupled programmable inputs that eliminate the need to
use external annunciators (e.g. to evaluate Buchholz, temperature and pressure signals).

8 outputs: Trip (SPDT) and watchdog (SPDT) plus 6 programmable outputs (2 SPDT + 4 SPST),

Full screen R – S – T and N ampermeter display, measurement functions that eliminate the need
to use double core CTs, external ampermeter and frequency-meters,

X / 1 A and X / 5 A current transformer compatibility in a single unit,

Wide setting ranges; (0.1-40) I
n
current setting range, (0.01-150) s DMT delay setting range,
(0.025-3.2) IDMT (TMS & RTMS) delay setting range.

2 independent settings groups,

3 independent thresholds for phase overcurrent protection,

3 independent thresholds for earth overcurrent protection,

2 independent thresholds for negative sequence overcurrent protection,

Broken conductor sensing, trip and alarm,

1 threshold phase undercurrent protection,

Thermal overload protection with thermal image according to IEC 60255-8 ed.2.0,

Auto-recloser with 4-shots, auto-reclosing programmability for each protection function,

Cold-load pickup function with high reliability CB-triggering,

Blocking logic selectivity feature,

Delaying logic selectivity feature,

Circuit breaker failure supervision and alarming,

Circuit breaker supervision functions: opening and closing time supervision; charging spring
supervision; numerator, ΣA and ΣA² supervision for each pole; trip circuit supervision,

Automatic secondary shorting,

Quick alarm menu access and enhanced alarm explanations;

8 programmable alarm LEDs,

Event and fault records up to 151 instances,

5 waveform records with 3 seconds duration each,

Electro-magnetic compatibility tested for IEC directives,

Draw-out system that enables under-load unit displacement / replacement,

Largest LCD graphics screen in its class (128 px x 64 px); easy-to-navigate user friendly menus
similar to mobile phones’,

Auxiliary supply voltage compatibility with all voltages in the field;
U
aux
= (24 – 240) V
DC
/ (24 – 240) V
AC
,

IP52 front side and IP20 backside environmental protection,

SCADA ready,

USB and RS485 communication ports; MODBUS RTU, IEC 60870-5-103 and DEMCOM
communication protocols support,

High precision manufacturing,

Free-of-charge PC software and accessories,

Fast and low cost repairs thanks to the modular electronics,

Matchless customer support, a variety of application diagrams and technical documents. □