0614CT1701

Micrologic X Control Unit Measurements

A Masterpact MTZ device with embedded current sensors and Micrologic X control unit is a power metering device complying with IEC/EN 61557-12, Class 0.5 accuracy for voltage and current and Class 1 accuracy for active power and energy measurements. For each measurement the accuracy is certified within a temperature range of -25 to 70°C (-13 to 158°F).

Measurements and Electrical Parameters Calculated by the Control Unit

Based on the measurement of line currents, neutral current, phase-to-phase voltages and phase-to-neutral voltages, a Micrologic X control unit calculates* and displays parameters required to monitor any AC electrical power system:

  • RMS values of current and voltage

  • Active, reactive and apparent power

  • Active, reactive and apparent energy

  • Power factor

  • Frequency

  • Phase sequence

  • Voltage unbalance, current unbalance

  • Current demand

  • Total active, reactive and apparent power demand

  • THD of voltage and current

The calculation of current and power demand are performed in compliance with IEC/EN 61557-12.

Thermal Demand

Demand Calculated with a Sliding Block Interval

Electrical values calculated by Micrologic X control units can be shown on the embedded HMI display, a smart device via Bluetooth, embedded web pages of Ethernet gateways, a PC running Ecoreach software and on the FDM128 display unit. They are refreshed every 2 seconds. The display on the embedded HMI allows easy navigation through the electrical values and access to a Quickview option for the main basic values.

Micrologic X control units log and time stamp minimum and maximum values since the last reset of all relevant measurements: currents, voltages, frequency, active power, reactive power, apparent power, total current harmonic distortion (THDI), total voltage harmonic distortion (THDV).... For the complete list of measurements and min / max values, see the Micrologic X User Guide (DOCA0102EN). The maximum and minimum values are resettable from the embedded display, a smart device via Bluetooth technology or a PC running Ecoreach software.

An optional external 24 Vdc power supply or the optional VPS module is required to process and display measurements below 20% of the rated current .

The phase-to-neutral voltages are available for four-pole and three-pole circuit breakers providing the connection of the VN terminal of Micrologic X control units to the neutral. For accuracy of the active power measurement the connection of the VN terminal of Micrologic X control units to the neutral is necessary. Please refer to the user guide (DOCA0102EN) for more details concerning the wiring and configuration of Micrologic X control units.

Energy Management Functions of Micrologic X Control Unit

Embedded sensors

A Masterpact MTZ device equipped with a Micrologic X control unit and its own embedded sensors is a Class 1 full chain measurement device for active power and energy metering*.

Embedded power metering avoids variation and uncertainty due to external sensors and wiring.

Effect of Temperature on Masterpact MTZ Circuit Breaker Measurement

The effect of the temperature on accuracy of the measurement has been carefully managed to maintain an operating temperature between -25°C and 70°C (-13°F and 158°F).

Micrologic X Control Unit Measurement Values

Type of Measurement

Symbol

Accuracy

Range Min Acc

Range Max Acc

Unit

EHMI *

FDM 128

Ecoreach Software,
EIFE, IFE, IFM

Currents

RMS Current of Phases

I1, I2, I3, Iavg

±0.5%

40 *

4,000 x 1.2 *

A

Voltages

RMS Phase-to-Phase Voltage

V12, V23, V31,
VLL average

±0.5%

208

690 x 1.2

V

RMS Phase-to-Neutral Voltage

V1N, V2N, V3N, VLN average*

±0.5%

120

400 x 1.2

V

Power and Energy

Active Power

P1, P2, P3, Ptot

±1 %

5

10,000

(±) kW

Reactive Power

Q1, Q2, Q3, Qtot

±2%

5

10,000

(±) kVAR

Apparent Power

S1, S2, S3, Stot

±1%

5

10,000

kVA

Power Factor

PF

±0.02

-1

1

 

Power Factor / Phase

PF1, PF2, PF3

±0.02

-1

1

 

Fundamental Power Factor (cos φ or DPF)

Cos φ

±0.02

-1

1

 

Fundamental Power Factor (cos φ or DPF) / Phase

Cos φ1, Cos φ2, Cos φ3

±0.02

-1

1

 

Active Energy *

Ep IN / OUT / total *

±1%

0

10,000,000

kWh

Reactive Energy*

Eq IN / OUT / total *

±2%

0

10,000,000

kVARh

Apparent Energy *

Es IN / OUT / total *

±1%

0

10,000,000

kVAh

Active Energy *

Ep IN / OUT / total *

±1%

0

10,000,000

kWh

Reactive Energy *

Eq IN / OUT / total *

±2%

0

10,000,000

kVARh

Apparent Energy *

Es IN / OUT / total *

±1%

0

10,000,000

kVAh

Current and Power Demands

Current demands

I1, I2, I3, IN, Iavg

±0.5%

40 *

4,000 x 1.2 *

A

Total active power demand

Ptot

±1%

5

10,000

(±) kW

Total reactive power demand

Qtot

±2%

5

10,000

(±) kVAR

Total apparent power demand

Stot

±1%

5

10,000

kVA

Power Quality

Frequency

F

±0.005

40

70

Hz

Phase Sequence
(0: a,b,c /1,2,3 - 1: a,c,b /1,3,2)

Phase sequence

NA

1 2 3

1 3 2

0 - 1

RMS Current on Neutral

IN

Neutral current available only with 4 pole circuit breakers or 3 pole circuit breakers with External Neutral Current Transformer (ENCT).

*

±1%

40 *

4,000 *

A

RMS Current on Ground Current

Ig

±5%

40 *

4,000 *

A

THDI Current Phase

ITHD I1, I2, I3, Iavg

Cl 5 *

0 %

100 % *

% *

*

THDI I Neutral

ITHD IN

Neutral current available only with 4 pole circuit breakers or 3 pole circuit breakers with External Neutral Current Transformer (ENCT).

*

Cl 5 *

0%

100% *

%*

*

THDU Phase-to-Phase voltage

VTHD V12,23,31, LLavg

Cl 2 *

0%

20% *

%*

*

THDV Phase-N Voltages

VTHD V1N,2N,3N, LNavg *

Cl 2 *

0%

20% *

%*

*

Current Unbalance vs Average 3 Phase RMS Currents

I_unbal 1,2,3, Iunbal (worst)

+5%

0%

100%

%

Phase-to-Phase Voltage Unbalance

VLL_Unbal 12 23 31 unbal

Cl 0.5

0%

10%

%

Phase-to-Neutral Voltage Unbalance

VLN_Unbal 1N, 2N 3N, unbal*

Cl 0.5

0%

10%

%

NOTE: Micrologic X control units log and time stamp minimum and maximum values since last reset of all relevant measurements. Main maximum values may be read on embedded HMI (Currents, Voltages, Frequence, Ptotal, Qtotal, THDIavg, THDUavg,THDIN ...). For a complete list of measurements and min / max values, see the Micrologic X User Guide DOCA0102EN.
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