Description

1 AND 3-PHASE POWER NETWORK METER

The ND20 (p)(e) meter is a digital programmable panel meter destined for the measurement of 3-phase 4-wire network parameters in balanced and unbalanced systems with the simultaneous display of measured quantities and digital transmission of their values. The meter enables the control and optimization of power electronics devices, systems and industrial installation operations.

The meter ensures the measurement of: rms values of voltage and current, active, reactive and apparent power, active, reactive energy, power factors, frequency, 15, 30, 60 minutes’ mean active power, archive of power profile, THD and harmonic measurements. Additionally, the current value in the neutral wire is calculated.

Voltages and currents are multiplied by given voltage and current ratios of measuring transformers. Indications of power and energy take into consideration values of programmed ratios. The value of each measured quantity can be transmitted to the master system through the RS-485 interface. The relay output signals the overflow of

the chosen quantity, and the impulse output can be used for the consumption check of 3-phase active and reactive energy. The meter has additionally a continuous current output.

The meter has a galvanic separation between respective blocks:

– supply,

– measuring inputs,

– volt

age and current inputs,

– analog output,

– RS-485 output,

– impulse output.