- All measurements:
True RMS AC voltage, true RMS AC current
Active / reactive / apparent power
Active / reactive energy
ϕ, power factor
Measurement of average values in time intervals (MD)
- Storing maximal values
- Real time clock
- Large graphic illuminated LCD display with excellent visibility
- Setting parameters via a front panel and / or via a communication input
- RS232 or RS485 serial communication port (very high speed data rate: up to 115,200 bit/s)
- Display of primary values of the measured quantities
- More than 50 displayed parameters (V, A, kW, kVA, kvar, kWh, PF, Hz, MD, THD, etc)
- Programmable CT and VT ratios
- Input voltage up-to 775 VL-L
- External inspection of consumed energy via two relay outputs
- Accuracy for most measuring quantities: class 0.5
- Auxiliary power supply:
Universal 24…220 V DC or 48…230 V AC/ 40…65 Hz or AC only
- Multi language support (7 languages)
The MI7140 measuring centre is the measuring instrument, which is used for measuring and monitoring the electric quantities in a three-phase electric energy distribution system. The instrument operation is based on fast sampling of input quantities (currents and voltages) in all three phases. The built-in microprocessor calculates other quantities (power, energy, currents, voltages, frequency, power factor, phase angle and THD) from the obtained data.
The real time clock enables storing of maximal values (MD). The instrument is provided with a built-in RS232 or RS485 serial communication with the MODBUS protocol, which enables data transmission and thus connection of the measuring places into the network for the control and management with energy.
The two pulse outputs (optional) are used for the transmission of data on consumed energy (energy export or/and import).
Measured quantities are read out on a large graphic LCD, which is controlled via a keyboard on the instrument front panel. Moreover, it is also possible to set the meter parameters like current and voltage transformers ratios, the MD measuring mode, real time, etc., via the keyboard.
The values of the measured quantities and parameters settings are accessible via the RS232 or RS485 serial port.
The instrument have a built in backup battery, which is used to preserve data (RTC, MD) in the MC’s memory when/if the power supply is off.