Short Circuit Loop Impedance Meter Sonel MZC-320S

The Sonel MZC-320S is a reliable tool for high current short circuit loop impedance measurement. Many testers sometimes need to perform multiple tests in the field. However many devices have an issue with overheating and time to cool down. The Sonel MZC-320S short circuit loop impedance meter is specially designed to perform multiple repeated measurements. This is enabled by an efficient ventilation and cooling system. The device can be used in the different segments of power industry and allows for multiple measurements of the short circuit loop impedance without the need for long downtimes.
The device can be controlled remotely when it is 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. Customers will gain access to the stored measurement results. They will also be able to download them in the classic manner, i.e. via a USB connection.

Capabilities

Measurement of very low short circuit loop impedances (with resolution 0,1 mΩ) with a current of 130 A at 230 V; maximum 300 A at 500 V.

Measurement with a current of 24 A at 230 V, maximum 27 A at 500 V with resolution 0,01 Ω.

Measurements in installations with rated voltages: 110/190 V, 115/200 V, 127/220 V, 220/380 V, 230/400 V, 240/415 V, 290/500 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.

Ability to change the length of test lead (measurement with 2p method).

4p (four-pole) method, test leads do not require calibration (measurement with current up to 300 A).

Measurement of resistance (RS) and reactance (XS) components.

Additional features

Touch voltage and touch shock voltage measurement with resistor 1 kΩ).

AC voltage measurement in range 0…550 V.

Frequency measurement 45.0...65.0 Hz.

Memory of 990 measurement results, ability to transfer the data to a PC via USB and Bluetooth.

Power supply: rechargeable battery

Reaching the areas unattainable to others

In electrical stations, where the circuits are equipped with a high current protection (fuse-links with the rating of several hundred amperes, motor circuit breakers), fault currents may reach several hundred kilo-amps. Measurement of fault loop impedance in such networks requires a high-current meter, which is capable of measuring ZS values at the level of single milliohms. Sonel’s patented technical solution, which uses a unique fault resistor, enables us to offer the meter perfectly in such demanding conditions.

Unique features of the device

Since other commercially available fault loop impedance meters perform the measurements asymmetrically, using half-wave current, the Sonel MZC-320S introduces the transitional constant and DC constant, which does not always result in a linear behavior of the transformer during the tests. This affects the accuracy of the results. MZC-320S applies symmetrical current for measurements, which means that it uses the full wave - thanks to the advanced design of the measuring system and fault circuit.

Applications of Impedance Meter Sonel MZC-320S

MZC-320S can be used for measurements in low voltage systems up to 500 V, where the prospective fault current may reach 69.4 kA (measured according to EN 61557). These parameters make the meter perfect for tests and measurements at wind farms, high-speed rail and in facilities controlled by power companies.