What does PTG stand for in terms of safe working distances in an EHV yard?

PTG stands for Permanent Test Ground in the context of safe working distances in an Extra High Voltage (EHV) yard. The concept of a Permanent Test Ground refers to an established grounding system designed to ensure safety for electrical testing and maintenance activities. This grounding system provides a low-resistance path to earth, which is crucial for dissipating fault currents and preventing electric shock to personnel who are working in close proximity to high voltage equipment.

In EHV yards, where voltages are significantly higher, adhering to safe working distances is vital for the safety of the workers. The Permanent Test Ground helps to minimize the risk of accidental ground potential rise due to fault conditions. This is especially important in environments where very high voltages are present, as even small errors in grounding and lack of adequate safety measures can lead to serious hazards.

Understanding the role of the Permanent Test Ground is essential for electricians and technicians who work with high voltage systems, enabling them to take necessary precautions to ensure their safety while performing their duties.