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The ground grid integrity and continuity test are described in IEEE 80 – 2013 standard, and it is one of the most efficient test methods and techniques for measuring the electrical characteristics of grounding systems. It is also known as a high-current test method, whose purpose is to check the continuity of buried ground conductors and connectors, ground rods, and bonding connections by injecting a high-test current (up to 300 A).
Ground Grid Testers (GGT Series) consist of 2 models – GGT200 and GGT300. The main difference between these models is the maximum test current.
DV Power GGT200 and GGT300 devices, in combination with the GGT-M module, make an ideal test system for contact resistance measurement of the grounding systems within the substations and other electrical facilities. Wireless communication between the GGT device and the GGT-M module enables remote start/stop of the test and monitoring of measured results.
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 flow direction and amplitude, voltage drop, and as well as inspection of the contact resistance values.
Furthermore, GGT200 and GGT300 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). Due to its Both Sides Grounded and Remote-Control functionalities, the instrument accurately measures even in the most demanding environments, providing additional safety to testing personnel.
With the above-stated capabilities, GGT is an ideal test system for inspection of the grounding systems, 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 such as earthing/bonding connections.
GGT is designed to evaluate the integrity of substation grounding systems and ground grids. It helps identify deteriorated, damaged, or disconnected grounding conductors that may compromise personnel safety and system reliability.
Ground grid integrity testing helps ensure that a substation grounding system can safely dissipate fault currents. Regular testing can reveal corrosion, damaged connections, or hidden defects before they become a safety risk.
GGT testing is performed according to IEEE 80 recommendations for substation grounding systems, helping utilities verify the condition of grounding networks and maintain compliance with industry practices.
GGT can be used to assess grounding systems in electrical substations, power plants, industrial facilities, renewable energy installations, and other critical infrastructure where reliable grounding is required.
The instrument injects a high test current into the grounding network and measures voltage drops between selected test points. The measured values help identify sections of the grid that may have degraded connections or excessive resistance.
Depending on the model, GGT can generate up to 200 A or 300 A continuous test current, allowing reliable testing of large grounding systems under field conditions.
The primary difference is the maximum test current capability. GGT200 provides up to 200 A, while GGT300 delivers up to 300 A for testing larger or more demanding grounding systems.
Yes. By measuring voltage drops across grounding conductors and connections, GGT helps identify damaged joints, corroded conductors, loose connections, and other integrity issues within the ground grid.
The battery-powered GGT-M module enables remote control of the test and wireless communication with the main unit, improving operator safety and simplifying testing procedures in substations.
Yes. When used with current clamps and the GGT-M module, the instrument can measure current flow through grounding conductors, helping users analyze current distribution and verify grounding paths.
GGT is specifically designed for substation environments and allows operators to perform ground grid integrity assessments while minimizing exposure through remote operation capabilities.
GGT simultaneously displays injected current, measured voltage drop, and related test parameters, allowing users to evaluate grounding conductor condition in real time.
Yes. Early detection of grounding system defects helps utilities prevent safety hazards, reduce outage risks, and avoid costly repairs caused by undetected ground grid deterioration.
Yes. GGT is designed for field use and includes a robust portable construction suitable for substation and industrial maintenance applications.
GGT is commonly used by utility companies, substation maintenance teams, commissioning engineers, testing service providers, and asset management specialists responsible for grounding system reliability.
