MZC-340-PV

High-current fault loop impedance meter

Capabilities

• Measurement of very low short circuit loop impedances (with resolution 0.1 mΩ) with a current of 130 A at 230 V; maximum 305 A at 550 V AC and 250 A at 900 V AC.
• Measurements in installations with rated voltages: 220/380 V, 230/400 V, 240/415 V, 290/500 V, 400/690 V, 460/800 V (from 200 V up to 900 V) and frequencies 45...65 Hz.
• Ability to perform measurements in short circuit system: phase-phase, phase-PE, phase-N.
• Differentiation between the phase voltage and the inter-phase voltage while calculating the short circuit current.
• 4p (four-pole) method, test leads do not require calibration (measurement with current up to 305 A).
• Measurement of resistance (R_S) and reactance (X_S) components.

Additional features

• Remote control.
• Touch voltage and touch shock voltage measurement with resistor 1 kΩ).
• AC voltage measurement in range 0...900 V.
• Frequency measurement 45.0...65.0 Hz.
• Memory of 990 measurement results, data transmission via USB and Wi-Fi.
• Power supply: rechargeable battery.

Facing the challenge

When building medium- and large-scale PV farms, designers, guided by the need to ensure the highest possible energy yield and thus the maximum return on investment, select inverters with a voltage of 1500 V DC / 800 V AC. Testing of such a system must address both the AC and DC sides of the PV system. Testing of all AC circuits must be performed in accordance with the requirements of IEC 60364-6.

The output voltage of 800 V AC, which in real conditions often exceeds this value, poses a huge problem for contractors and servicing companies, since for such high voltages there are no devices on the market to check the installation for compliance with the conditions of electric shock protection in terms of measuring the impedance of the short circuit loop.

Sonel was the first company in the world to take on the challenge of creating a fault loop impedance meter for operating voltages up to 900 V AC and measurement category CAT IV 1000 V. This is how the Sonel MZC-340-PV meter was created.

The leader does not take shortcuts

The energy released at mains voltage of 800-900 V AC can pose a danger to the personnel performing measurements. That’s why the MZC-340-PV is only wirelessly controlled.

Applications

The instrument is used for measurements in networks with rated voltage up to 900 V AC, where the prospective fault current may reach over 100 kA, as measured according to EN 61557.

These parameters make the meters perfect for tests and measurements at wind farms, high-speed rail and in facilities controlled by power companies.

Remote working is always the best solution

The instrument can be controlled remotely - all that is required is for the meter to be logged into the same Wi-Fi network as the controlling device, i.e. any device with a web browser. After calling up the virtual control panel in the browser, the user will be able to start the measurement from a convenient distance and then read out the results.

By the same means, he will gain access to the stored measurement results. Importantly, he or she will also be able to download them in the classic manner, i.e. via a USB connection.