The difference between high voltage line AC and DC
High-voltage lines can be divided into direct current and alternating current. Direct current is direct current, which is the opposite of alternating current.
High-voltage lines can be divided into direct current and alternating current. Direct current is direct current, the opposite of alternating current. Power grid companies generally use alternating current to transmit power, but high-voltage direct current is used for long-distance high-power transmission, submarine cable transmission, and communication between asynchronous and AC systems.
Compared with the HVDC transmission mode, the HVDC transmission mode has obvious advantages. Historically, AC transmission has replaced DC transmission only for technical reasons. The advantages of alternating current are mainly reflected in power generation and distribution. The use of an alternator based on the principle of electromagnetic induction can economically and conveniently convert mechanical energy, chemical energy and other forms of energy into electrical energy.
The advantages of DC power are mainly in power transmission. When the same power is transmitted, the wire used for DC power transmission is only 2/3-1/2 of that of AC power transmission. In cable transmission lines, DC power transmission does not generate capacitive current, while AC power transmission line has capacitive current. , causing loss.
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