Ground Grid Testers GGT series contains 2 models: GGT200 and GGT500. The main difference between these models is the maximum test current.
Ground grid integrity test is described in IEEE 80 – 2000 standard and it is one of the most efficient test methods and techniques for measuring the electrical characteristics of grounding systems. DV Power GGT200 and GGT500 devices in combination with the GGT-M module make an ideal test system for ground grid integrity testing. Wireless communication between the GGT device and GGT-M module provides mobility to the test operator, enabling the remote control functionality during the testing.
The ground grid integrity test is performed by injecting continuous DC current between the inspected grounding point and the reference grounding point (e.g. transformer grounding). Finally, the condition of the ground grid is determined based on the obtained information about the current path and voltage drop, as well as inspection of the current flow (e.g. measurement of the so-called “DOWN” current)
Furthermore, GGT200 and GGT500 devices can also be used as powerful high-precision micro-ohmmeters for contact resistance measurement of the non-inductive test objects (e.g. circuit breakers). When used as a micro-ohmmeter, the GGT device has Both Sides Grounded and Remote Control functionalities.
With the above-stated capabilities, GGT is an ideal test system for inspection of the grounding system beneath substations (ground grid integrity), as well as for contact resistance measurement of medium- and high-voltage circuit breakers, disconnecting switches, high-current bus bar joints, cable splices, and different high-current links.