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The most effective means of electricity transmission is alternating current. It has a number of advantages over direct current, but is more costly to produce. As a result, power transmission systems that use HVDC are typically found in regions where the cost of DC power would be too high due to long distances from generation sources to consumers. In this post, we'll explain how they work and provide some examples from around the world. Typically, the power is transferred across the three-phase based system under the condition of bidirectional current. If two points are to be supplied with electricity, it is essential to ensure that they are both electrically isolated from each other. Such isolation can be ensured by using a HVDC circuit. A HVDC system consists of two or more three-phase power sources and an HVDC converter, which serves as an interface between them. The transfer of electricity can take place over either one or both transmission paths. The power transfer paths may include some or all wires of a bus bar circuit. The system may be built such that the connection between two points is alternated back and forth. In such a case, phase to phase HVDC system transfer occurs. The power source may be fully synchronous or partially synchronous with the converter. The number of phases in the DC-AC power system determined by the number of different sources at each end of a transmission path. A bituminous HVDC bus bar circuit provides a low voltage bus at each end that can be used to couple an HVDC converter onto a standard AC transmission line, while allowing the standard AC line to be used for connecting other loads without going through a converter. The HVDC circuit configuration with the bus bar is similar to that of a three-phase AC transmission line with a center pole. According to Faradays law of electromagnetic induction, if electricity is allowed to flow through a conductor in one direction and then suddenly turned off, an opposite electric current will flow in the opposite direction due to the imposed voltage on the system. Such an electrical effect is called synchronous rectification and it is used in an HVDC system for converting direct current into alternating current. The converter fed by DC power source will function as a choke if it receives zero input voltage. HVDC power transmission can be employed for the following applications: The basic HVDC bus bar system is based on a single-phase source. It has two terminals which are connected to two three-phase AC lines through the three-phase HV converter. A HVDC current will flow through one of the AC lines and return to the other AC line through the converter in such a way that it appears as an unidirectional current in each direction. A GEC substation is widely used in supplying large amounts of electricity at high voltages and capacities to multiple customers located at long distances from each other. cfa1e77820
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