Cost and Loss Comparison: Transmitting Power via Low Voltage vs High Voltage Cable Networks
Cost and Loss Comparison: Transmitting Power via Low Voltage vs High Voltage Cable Networks Every electrical engineer faces the same fundamental question when designing a distribution system: should you push power at low voltage over heavy conductors, or step it up to medium voltage and let thinner cables carry the load? The answer isn't always obvious. Installation budgets, long-term energy losses, safety codes, and equipment costs all pull in different directions. This article breaks down the real cost and loss trade-offs between low voltage (LV) and high voltage (HV) cable networks using concrete data and industry standards. Key Takeaways Copper savings dominate at higher voltages : stepping from 0.6/1 kV to 6-35 kV can reduce conductor cross-section by 60-80% for the same power transfer. I²R losses drop by the square of the voltage ratio : doubling voltage cuts resistive losses by roughly 75% at the same power level. Initial equipment cost is higher for HV : transformers...