Metrel MI 3290 GX Ground Earth Tester

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Metrel MI 3290 GX Ground Earth Tester

MI 3290 Earth Ground Tester is a portable, battery or mains powered test instrument with excellent IP protection (IP 54 open case), intended for measurement of ground resistance, specific ground resistance and ground potential of various energetic and non-energetic objects. The user can choose between different methods from classic 3 wire ground resistance measurement up to one or four clamp method for measurement of pylons. He has a choice of measurement methods with different frequency methods: single frequency or frequency sweep from 55 Hz to 15 kHz, HF method with 25 kHz and pulse method simulating the lightning strike. High electrical noise immunity makes this instrument best suited for industrial environment. Instrument is available in multiple sets which are a combination of different accessories and measurement functions.

Standards applied

Earthing and lightning protection

• LPSinsp Competences: Lightning Protection of Buildings Inspection
• LPSc Competences: Lightning Protection of Buildings for Contractors and Maintainers
• IEC 62305 Protection against lightning – series
• IEC/EN 61557-5 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 5: Resistance to earth

Earthing and grounding

• EES Competences: Electrical Energetic Systems Earthing and Grounding Safety
• IEEE Guide for Safety in AC Substation Grounding
• IEEE 81-2012 IEEE Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Grounding System
• IEEE 142 Recommended Practice for Grounding of Industrial and Commercial Power Systems
• IEEE 367-2012 – IEEE Recommended Practice for Determining the Electric Power Station Ground Potential Rise and Induced Voltage from a Power Fault
• EN 50522 Earthing of power installations exceeding 1 000 V a.c.

Properties

Measuring functions

• Earth Resistance 2,3,4 -pole;
• Selective Earth Resist (1 x clamp);
• Earth Resistance (2 x iron clamps);
• Specific Earth Resistance (Wenner and Schlumberger method);
• HF-Earth Resistance (25 kHz, acc. to IEEE_Std 81);
• Earth Resistance of mono pylons with 10 m flex clamp;
• Earth Resistance of multi–leg pylons with up to four flex clamps;
• Current measurement (Iron, flex clamps);
• Low Ohm measurement 7 mA and 200 mA;
• Earth Potential;
• Step and contact measurements;
• Impulse Earth measurement 10/350 µs.

Key features

• Possibility of performing all types of earth measurements with a single instrument.
• Analysis of earth impedance as a function of the frequency due to a wide measurement frequency band (55 Hz … 15 kHz).
• Earth measurements on pylons with protective earth cable connected.
• Measurement on mono towers and 4-leg tower.
• A wide variety of measuring clamps: from iron clamps to flex clamps with 10 m length.
• HF-Earth resistance measurement (acc. to IEEE_Std 81).
• Sweep mode Z(f) on screen.
• High resolution color touch screen, 4.3” TFT.
• Floating Mains (universal 90 … 260 V AC) or battery powered (built in fast charger).
• High degree of protection: IP 65 case closed, IP 54 case open.
• Checkbox – different self-check methods.
• DC resistance measurements.
• Impulse impedance measurement for simulating the lightning strike.
• Support for single or automated measurements.
• PC SW for measurement pre and post processing: preparation of the test structure, result download, tree-view, table view and graphical view, storing and printing.

Technical data

Station

• Dimensions (w x h x l): 360 X 160 X 330 mm
• Weight (with batteries, without accessories): 6 kg

Meter

• Dimensions (w x h x l): 230 X 103 X 115 mm
• Weight (with batteries, without accessories): 1.3 kg

Applications

Low voltage earthing and lightning protection

• Earthing measurement with fall of potential method

Hospital earthing and lightning protection

• Hospital earthing measurement with fall of potential method