There are three differences between a DC fuse and an AC fuse
(1) In the case of DC transmission, ac systems on both sides do not need to run synchronously, while AC transmission must run synchronously. When ac power is transmitted over a long distance, the phase difference between the two ends of the ac power transmission system will be significant.
(2) The loss of HVDC transmission failure is smaller than that of AC transmission. If two AC systems are connected by AN AC line, when a short-circuit occurs on one side of the system, the other side sends the short-circuit current to the faulty side.
(3) In cable transmission lines, dc transmission lines have no capacitive current, while AC transmission lines have capacitive current, causing losses. Alternating current (ac) is to use ac generator, in the process of power generation, more uniform distribution of magnetic pole is according to certain Angle on a circle, make the power generation process, each coil is cutting lines, with much of the poles, each of the lines of magnetic force produced by magnetic pole was cut of voltage and current are change by string pattern, so can continuously produce stable current. The direction of the direct current does not change with time. It is usually divided into pulsating direct current and steady current. Pulsating DC has AC components, such as the power supply circuit in color TV, about 300 volts of voltage is pulsating DC components can be removed by capacitor. Steady current is more ideal, the magnitude and direction are constant.
A surge protective device (SPD) is designed to protect electrical systems and equipment from surge events by limiting transient voltages and diverting surge currents. Surges can originate externally, most intensely by lightning, or internally by the switching of electrical loads. The sources of these internal surges, which account for 65% of all transients, can include […]
GENERAL INFORMATION l Two-pole/ Three pole/ Four pole varistor surge protective device (AC SPD) l Combined SPD Type 1&2 with MOV and CDGG technology for use in different power system. l Visual indication and optional remote contact signaling(S), capable of protecting Terminal equipment. l Non-follow current. l The Prewired complete unit consisting of a base […]
With the development of China’s power industry, the power equipment manufacturing industry has accelerated its growth. However, under the situation of overcapacity, rising costs and increasingly fierce market competition, some enterprises compete at low prices and low quality, cut corners and shoddy goods in order to obtain illegal profits, resulting in quality and safety accidents […]
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