This post covers How does CCHT work?, What is a CCHt?, What is the advantage of transmitting electricity using direct current over alternating current?
How does CCHT work?
High-voltage direct current (HVDC) works by converting electrical energy from alternating current (AC) to direct current (DC) for transmission over long distances. HVDC systems use rectifiers to convert alternating current to direct current at the sending end. The direct current is then transmitted through a specialized HVDC transmission line, made up of conductors designed to handle high voltages.
On receipt, the inverters convert direct current back to alternating current for use in the local power grid.
HVDC is preferred for long distance transmission because it has lower losses than AC transmission.
What is a CCHt?
Direct current (DC) is carried across transmission lines using constant voltage polarity.
In DC transmission systems, electricity flows in only one direction, from the power source to the load. This is achieved by generating DC power through devices such as batteries or DC generators and then transmitting it through conductors. DC transmission is advantageous for specific applications, such as underground or submarine cables, where AC transmission may be less efficient.
An AC generator, also called an alternator, works by converting mechanical energy into electrical energy using alternating current.
It consists of a rotating magnetic field (rotor) and a fixed set of wire windings (stator). As the rotor rotates in the stator, it creates a rotating magnetic field which induces an alternating voltage in the stator windings due to electromagnetic induction.
This alternating voltage generates alternating electricity, which can be distributed for use.
What is the advantage of transmitting electricity using direct current over alternating current?
Direct current (DC) works by allowing electrical charge to flow in a consistent direction.
In DC circuits, the voltage remains constant and the current flows steadily from positive to negative. This constant flow of charge is produced by power sources such as batteries or DC generators. Direct current is used in various applications, including electronic devices and low-voltage electrical systems, due to its stable and predictable characteristics.
Direct current cannot be transmitted over long distances as efficiently as alternating current (AC) due to higher energy losses and technical limitations.
DC transmission lines face significant losses due to conductor resistance and the need for complex conversion equipment to change voltages. Additionally, it is difficult to adjust voltage levels for efficient transmission and distribution with DC.
Alternating current, on the other hand, can easily be transformed to higher voltages using transformers, reducing losses over long distances and making it more suitable for widespread electrical distribution.
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