Does not require any intermediate substations for reactive power compensation. Requires intermediate substations for compensation. Very fast and accurate power flow control is possible. Power flow control is slow and is very difficult.
Skin effect is absent resulting in uniform distribution of current density across the cross-section of the conductor. Skin effect is present due to which current density is non-uniformly distributed across the cross-section f the conductor.
Corona loss and radio interferences are absent resulting in less insulation level required for the transmission line. Corona loss and radio interferences are more due to which high insulation level is required for the transmission line. Voltage in the line does not fluctuate with the load.
Voltage in the line fluctuates with the load. Does not require a double circuit, in this systems earth return is used. Always requires a double circuit.
Such types of systems are called asynchronous systems. These power grids cannot be connected together using a normal AC interlink. As far as DC is concerned, there is no phase or frequency. Therefore the HVDC interlink can easily interconnect such asynchronous power grids. The Circuit breaker is a very important equipment in high voltage power transmission. It de-energize the whole circuit in case of any fault or maintenance. The circuit breaker needs arc-extinguish capabilities in the current to break the power supply.
The Alternating current generates a continuously variable magnetic field that can cause interference in the nearby communication conductors. Related Posts:. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents.
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Please consider supporting us by disabling your ad blocker. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. It stands for High Voltage Alternating Current. It stands for High Voltage Direct Current. It uses a transformer for voltage conversion. It uses solid-state semiconductor based converters for voltage conversion. HVAC transmission requires a minimum of three conductors.
It offers better flexibility allowing multiple tappings in the pathway. The AC vs. DC question has been around since the era of the war of currents. Improvements in DC system A major problem that Edison could not solve was how to increase the transmission voltage of DC for transmitting the power over longer distances. With the development of mercury arc valves, it became easier to convert the power between AC and DC. The AC power could now be converted into DC after stepping up the voltage using a transformer and, at the end of the transmission line , it could be converted back into AC for stepping down.
This made High Voltage DC transmission technically feasible. However, the converter equipment was very large and expensive and required a lot of maintenance. Soon after, solid state thyristor valves were developed. They were smaller and cost effective.
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