DV Power GGT Series Ground Grid Integrity Tester for High-Current Grounding System Verification
For substations, industrial facilities, and critical electrical infrastructure, grounding system integrity is essential for both personnel safety and reliable fault-current dissipation. The DV Power GGT Series Ground Grid Integrity Tester is designed to help maintenance teams verify the continuity and condition of buried grounding systems by using the high-current test method described in IEEE 80-2013. DV Power explains that this method is one of the most efficient techniques for checking the electrical characteristics of grounding systems, including buried ground conductors, connectors, ground rods, and bonding connections, by injecting a high test current of up to 300 A.
One of the biggest advantages of the GGT Series is its focus on ground grid integrity and continuity testing, not just simple low-current continuity checks. DV Power states that the test is performed by injecting continuous DC current between the inspected grounding point and a reference grounding point, such as a transformer ground. The condition of the ground grid is then determined based on the direction and amplitude of the current flow, the measured voltage drop, and inspection of the resulting contact resistance values. This makes the system especially useful for evaluating the real condition of substation ground networks rather than only confirming a basic electrical connection.
The GGT Series consists of two models: the GGT200 and the GGT300. DV Power notes that the main difference between these models is the maximum available test current, giving users a choice based on the scale of their grounding system and the current level needed for the inspection. This is important because some grounding networks and bonding paths require higher injected current to produce meaningful measurement results, especially in large substations or industrial grounding systems.
Another major strength of the system is the use of the GGT-M module. According to DV Power, the GGT200 or GGT300 used together with the GGT-M forms an ideal test system for contact resistance measurement of grounding systems in substations and other electrical facilities. The company also highlights wireless communication between the main GGT device and the GGT-M module, which enables remote start/stop of the test and monitoring of measured results. In practical field work, this can improve both efficiency and safety by reducing the need for technicians to remain directly beside the instrument during the full test process.
The GGT Series is particularly relevant because grounding system integrity is often difficult to verify visually. Buried conductors, hidden connectors, and aged bonding points may degrade over time without obvious external signs. A high-current integrity test provides a more meaningful way to evaluate whether the grounding path remains electrically continuous and whether critical joints are still performing as expected. This is an inference based on DV Power’s emphasis on buried conductors, connectors, rods, and bonding points as the main targets of the method.
Another practical benefit is that the GGT approach aligns with recognized grounding-system test practice. DV Power specifically references IEEE 80-2013, which adds confidence for utilities and industrial users who want methods grounded in established standards and accepted testing procedures. For organizations responsible for substation maintenance, grounding verification, or facility safety audits, that standards-based positioning can make the GGT Series easier to justify as part of a structured maintenance program.
The GGT Series is therefore best suited for users who need more than a simple ohmmeter. It is intended for maintenance teams that need to verify the continuity of buried ground conductors, assess bonding integrity, and perform high-current contact resistance measurements across the grounding system of a substation or industrial site. In those applications, the ability to inject substantial DC current and assess the resulting electrical behavior gives the GGT Series a stronger diagnostic role than simpler handheld resistance tools.
For utilities, substations, and industrial facilities that depend on a reliable grounding network, the DV Power GGT Series offers a practical solution for verifying ground grid continuity, evaluating contact resistance, and improving confidence in grounding system condition. Its combination of high-current testing, wireless remote operation, and IEEE 80-based methodology makes it a strong fit for serious grounding system maintenance and integrity testing.
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