MZC-320S
Catalog index: WMGBMZC320
High-Current Fault Loop Impedance Meter
Heavyweight for high-current measurements
If you rely on reliable tools in your work, the Sonel MZC-320S high current short circuit loop impedance meter is a proven choice for you.
In the work of every measuring engineer, electrician or technician, it is sometimes necessary to make multiple measurements. In such situations, many devices get blocked due to overheating, causing downtime. The Sonel MZC-320S short circuit loop impedance meter has been designed to perform flawlessly even in repeated measurements. The unit features an efficient ventilation system to minimise the cooling time of the short-circuit resistor. The instrument performs very well in the widely understood power industry and allows for multiple measurements of the short circuit loop impedance without the need for long downtimes.
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 direct vicinity of transformers or in transformer 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 hundreds of 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. Our patented technical solution, which uses components not available in the commercial offer (unique fault resistor), enables us to offer the meter with perfect performance in such demanding conditions
Measurements without compromise
Commercially available fault loop impedance meters perform the measurements asymmetrically, i.e. using half-wave current. This solution introduces the transitional constant and DC constant, which does not always result in a linear behaviour of the transformer during the tests. This in turn, affects the accuracy of the results.
MZC-320S high-current meter applies symmetrical current for measurements, which means that they use the full wave - thanks to the advanced design of the measuring system and fault circuit.
Applications
The instrument is used for measurements in networks with the following rated voltage:
- up to 500 V, where the prospective fault current may reach 69.4 kA, as 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.
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.
Specification
Voltage measurements (True RMS)
| Range | Resolution | Accuracy |
|---|---|---|
| 0…750 V | 1 V | ±(2% m.v. + 2 digits) |
- frequency range: DC, 45…65 Hz
- input impedance of the voltmeter: >200 kΩ
Frequency measurements (for voltages in range 95…750 V)
| Range | Resolution | Accuracy |
|---|---|---|
| 45,0…65,0 Hz | 0,1 Hz | ±(0,1% m.v. + 1 digit) |
Short circuit loop parameters measurement using high current (4p, Imax=300 A)
High-current of measurement of short circuit loop impedance ZS:
measuring range according to IEC61557: 7,2 mΩ…1999 mΩ
| Range | Resolution | Accuracy |
|---|---|---|
| 0…199,9 mΩ | 0,1 mΩ | ±(2% m.v. + 2 mΩ) |
| 200…1999 mΩ | 1 mΩ | ±(2% m.v. + 2 mΩ) |
Short circuit resistance R and reactance XS display range
| Range | Resolution | Accuracy |
|---|---|---|
| 0…199,9 mΩ | 0,1 mΩ | ±(2% m.v. + 2 mΩ) impedance reading for a particular measurement |
| 200…1999 mΩ | 1 mΩ | ±(2% m.v. + 2 mΩ) impedance reading for a particular measurement |
Short circuit current indication
measuring range according to IEC 61557:
- for Un = 230 V 115,0 A…32,0 kA
- for Un = 400 V 200 A…55,7 kA
- for Un = 500 V 250 A…69,4 kA
- for Un = 690 V 345 A…95,8 kA
| Range | Resolution | Accuracy |
|---|---|---|
| 115,0…199,9 A | 0,1 A | Accuracy of the curren indication computed, respectively, with the use of resistance measurements |
| 200…1999 A | 1 A | Accuracy of the curren indication computed, respectively, with the use of resistance measurements |
| 2,00…19,99 kA | 0,01 kA | Accuracy of the curren indication computed, respectively, with the use of resistance measurements |
| 20,0…199,9 kA | 0,1 kA | Accuracy of the curren indication computed, respectively, with the use of resistance measurements |
| 200 kA…* | 1 kA | Accuracy of the curren indication computed, respectively, with the use of resistance measurements |
* 230 kA for UL-N
400 kA for UL-L
Short circuit loop parameters measurement using standards current (2p, Imax=30 A)
Touch voltage measurements UST and shock voltage UT
| Range | Resolution | Accuracy |
|---|---|---|
| 0…100 V | 1 V | ±(10% m.v. + 2 digits) |
Short circuit loop impedance ZS measurement:
measuring range according to IEC61557: 0,13 Ω…199,9 Ω for test leads length 1,2 m
| Range | Resolution | Accuracy |
|---|---|---|
| 0,00…19,99 Ω | 0,01 Ω | ±(2% m.v. + 3 digits) |
| 20,0…199,9 Ω | 0,1 Ω | ±(3% m.v. + 3 digits) |
Short circuit resistance RS and reactance XS display range
| Range | Resolution | Accuracy |
|---|---|---|
| 0,00…19,99 Ω | 0,01 Ω | ±(2% m.v. + 3digits) impedance reading for a particular measurement |
| 20,0…199,9 Ω | 0,1 Ω | ±(3% m.v. + 3 digits) impedance reading for a particular measurement |
Readings short circuit current
| Range | Resolution | Accuracy |
|---|---|---|
| 1,150…1,999 A | 0,001 A | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
| 2,00…19,99 A | 0,01 A | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
| 20,0…199,9 A | 0,1 A | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
| 200…1999 A | 1 A | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
| 2,00…19,99 kA | 0,01 kA | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
| 20,0…40,0 kA | 0,1 kA | Accuracy of the current indication computed, respectively, with the use of resistance measurements |
„m.v.” – measured value.
Electric security:
- type of insulation: double, according to PN-EN 61010-1 and IEC 61557;
- measurement category: IV 600 V acc. to PN-EN 61010-1;
- protection class acc. PN-EN 60529: IP20 (IP67 with front cover closed);
Other technical data:
- power supply: build in Li-Ion 7,2 V/8,8 Ah
- resistor limited the current:
- for 4 pole method 4p: 1,8 Ω;
- for two pole method 2p: 9,4 Ω for U≤253 V, 19 Ω for U>253 V,
- number of short circuit loop measurements: 2000 (4/min.),
- temperature coefficient: ±0,1% measured value /°C;
- dimensions: 390 mm x 310 mm x 170 mm;
- weight: 6,6 kg
Rated operational conditions:
- operating temperature 0…+40 °C
Reviews
There are no reviews yet.