For long-distance power transmission, the two primary methods are High-Voltage Alternating Current (HVAC) and High-Voltage Direct Current (HVDC). The choice between them depends on factors like distance, cost, and purpose.

• High-Voltage Alternating Current (HVAC): HVAC is the traditional and most common method for power transmission. It's highly effective for shorter to medium distances because transformers can easily step up and step down the voltage, making it easy to integrate into existing power grids. However, HVAC experiences significant energy losses over very long distances due to factors like line capacitance and reactance.

• High-Voltage Direct Current (HVDC): HVDC is the superior technology for transmitting power over extremely long distances (typically over 300 km or 186 miles), particularly for connecting remote power sources like hydroelectric or solar farms to major population centers. HVDC lines experience lower energy losses than HVAC over long distances and can connect grids that are not synchronized. The primary drawback of HVDC is the high cost and complexity of the converter stations required at each end of the line.

At Ningbo Changshi, we manufacture a comprehensive range of equipment for both HVAC and HVDC projects. Our overhead transmission line (OHTL) stringing equipment is engineered to handle the unique demands of high-voltage lines, regardless of whether they are carrying AC or DC power.