What is ground resistance?
The ground resistance is defined as the ratio of voltage across the grounding device and the current flowing into the earth through the grounding device. The value of the ground resistance is the combination of grounding device resistance, lead resistance, contact resistance between grounding device and soil, and surrounding soil resistance.
What is high-resistance grounding (HRG)?
High-Resistance Grounding (HRG): To provide a safe amount of ground fault current, HRG systems employ a high-resistance grounding resistor. This approach keeps the system running even when there's a ground fault, giving you more time to find and fix the problem without affecting service.
What is a grounding system?
In any electrical circuit network, the circuitry that provides a path between the parts of the circuit and the ground, is known as the grounding system. The grounding system is required for reliable operation of any electrical equipment including generator, transformer, power system tower, and other power system installation under fault conditions.
What is a resistive grounding system?
Resistive Grounded System; Using a resistor in the grounding system effectively attenuates the amplitude of common-mode current, stray current, and short circuit fault current. Using a proper resistance value makes this grounding scheme a suitable choice for DC traction systems, AC drive applications, and also LVDC grids.
What is the power loss in grounding resistance?
The power loss in grounding resistance is 510 W which is 1.1% of the nominal power of VSC, affecting the efficiency of VSC. This structure is able to maintain service continuity under fault conditions by using a high resistor value. Also, small resistance increases CM current which should be avoided in some cases such as motor drive systems.
What is high resistance grounding?
The high grounding system is used in the small and medium industry applications where continuous operation is required during the fault condition. The value of the resistance is chosen in such a way that it allows 1–10 A current during the ground fault. There are some advantages of high resistance grounding. These are,
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