Why are there three utility poles for the high-voltage power supply at our factory?

The reason why three utility poles are used for high-voltage incoming lines is that most systems for transmitting electricity at high voltages utilize three-phase alternating current. In a three-phase AC system, we have three phases, usually referred to as Phase A, Phase B, and Phase C. Each phase requires a pole, so a total of three poles are needed. High-voltage incoming lines are usually equipped with the following devices: 1. High-voltage isolation switch: This is a mechanical cutting device that is used to disconnect the connection from the power grid during equipment maintenance in order to ensure personal safety. 2. High-voltage circuit breakers: Their main function is to disconnect the circuit in case of system faults, such as short circuits or overloads, thereby protecting electrical equipment. 3. Lightning arrester: A lightning arrester is used to prevent electrical equipment from being damaged by lightning strikes and overvoltages; it provides a path to ground to discharge excessive voltage into the ground. 4. High-voltage metering cabinet: The high-voltage metering cabinet is equipped with current transformers and voltage transformers, which can be used to measure electrical parameters such as current and voltage. As for the numbers, the identifier for each device may vary depending on the company’s internal management regulations. Generally, numbering is done based on factors such as the type of equipment, phase, and location. For example, the circuit breakers may be numbered as “Circuit Breaker 1”, “Circuit Breaker 2”, etc., or labeled by phase such as “Phase A Circuit Breaker”, “Phase B Circuit Breaker”, etc. .