CMD – Multifunction Transducers
The CMD product line – Multifunction Transducers – are based on the SIGMA-N digital protection relay technology. They measure the electrical parameters of a High Voltage or Medium Voltage systems to produce analogue impressed current signals.
CMD6N – Multifunction Transducers Unit
The CMD6N Multifunction Transducers Unit is based on the SIGMA-N digital protection relay technology.
It performs the function of measurement transducer for electrical parameters in a HV or MV three-phase power
systems (balanced or unbalanced).
The following parameters are measured :
- currents I1, I2 , I3
- voltages U1, U2, U3
- voltages U12 , U23 , U31
- frequency
- active power
- reactive power
- apparent power
- power factor cos ϕ
All the measured electrical parameters are made available to SCADA system RTU’s through :
- n°7 independently programmable impressed DC output currents
- serial line RS485 – MOD BUS
The accuracy class of the measuring system is the following:
- currents, voltages 0.2 %
- powers 0.5 %
- frequency 25 mHz
- cosϕ 0.5 %
The response time 0-99% is ≤ 120 ms.
For the power measurement the following insertions of the CMD6N unit can be selected (programmed) :
- Four-wire
- Aron – three-wire
- Single-phase (I1 – U1 )
Application – the CMD6N unit is designed to convert the electrical parameters of a three-phase power system for:
- SCADA acquisition systems
- Cogeneration control systems
- Energy management systems
| FUNCTIONS | |
| 7 independently programmable impressed current outputs | |
|
Response time |
120 ms |
| Accuracy | |
| Currents II, 12 , 13 | CI 0.2 |
| Voltages U1, U2, U3 | CI 0.2 |
| Voltages U12, U23 , U31 | CI 0.2 |
| Active power P | CI 0.5 |
| Reactive power Q | CI 0.5 |
| Apparent power A | CI 0.5 |
| Frequency | 25 mHz |
| Programming | |
| Keyboard on front panel | RS232 interface |
| RS485 interface | |
| 4 output relay for alarm signalling | |