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What is the Principle of High-Voltage Power Distribution System?

1 Answers

MacLily

07/30/25 7:32am

High-voltage power distribution system refers to the segment of the power system from the outlet of the step-down distribution substation (high-voltage distribution substation) to the user end. The distribution system is a power network system composed of various distribution equipment (or components) and distribution facilities that transform voltage and directly distribute electrical energy to end users. Low-voltage distribution systems are classified into three types based on different grounding methods: TT, TN, and IT systems, as described below: 1. TT Power Supply System: The TT system refers to a protection system where the metal casing of electrical equipment is directly grounded, known as the protective grounding system, also called the TT system. The first symbol T indicates that the neutral point of the power system is directly grounded; the second symbol T indicates that the exposed metal conductive parts of the load equipment, not connected to live parts, are directly connected to the ground, regardless of how the system is grounded. 2. TN Power Supply System: This power supply system connects the metal casing of electrical equipment to the working neutral line for protection, known as the neutral grounding protection system, denoted as TN. 3. IT Power Supply System: The letter I indicates that the power source side has no working ground or is grounded through high impedance; the second letter T indicates that the load-side electrical equipment is grounded for protection.

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