The use of high voltages for long-distance power transmission is a fundamental principle of electrical engineering aimed at solving the problem of power loss. The reason is simple and tied directly to the relationship between power, voltage, and current:

Ptransmitted=V×I

Ploss=I2×Rline

When power is transmitted at a low voltage, a very high current is required to carry the same amount of power. This high current leads to significant energy loss due to resistive heating. By using a step-up transformer to convert power to a very high voltage (e.g., 500 kV or 800 kV), the current is reduced to a very small fraction of its original value. This reduction in current, squared, results in a dramatic decrease in the power lost as heat along the transmission line. This efficiency is what makes it economically and technically feasible to supply power from distant power plants to cities and industries.

At Ningbo Changshi, our role in this process is to provide the reliable and durable OHTL equipment and accessories needed to build the massive high-voltage transmission lines that make this efficient power transfer possible.