Reference: "Can a high-voltage current-limiting fuse limit the magnitude of a short-circuit current? "
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Published Time:
2025-01-17
A high-voltage current-limiting fuse can limit the magnitude of short-circuit current
A high-voltage current-limiting fuse can limit the magnitude of short-circuit current. Once the short-circuit current exceeds the breaking current, it will be cut off.
High voltage current limiting fuse:
The function of a high-voltage fuse is to provide short-circuit and overload protection for circuits and equipment. It uses the melting of a low-melting-point metal wire (or strip) (also known as a fuse element) to interrupt the circuit. It has a simple structure, low cost, and is easy to maintain.
High-voltage fuses can be classified as indoor and outdoor types according to their installation location, and as current-limiting and non-current-limiting types according to whether they limit current. A high-voltage current-limiting fuse is a fuse whose porcelain tube is filled with quartz sand. When a short-circuit current causes the fuse wire to melt and produce an arc, the narrow gaps between the quartz sand particles restrict the arc column diameter. Combined with the cooling effect of the quartz sand, the arc is extinguished before the current reaches its steady-state value, achieving current-limiting effect.
What are the main parameters and characteristics of a high-voltage current-limiting fuse? Main parameters and characteristics of a high-voltage current limiting fuse:
(1) Rated voltage: This refers to the voltage that the high-voltage current-limiting fuse can withstand for a long time after disconnection. It is generally equal to or greater than the rated voltage of the equipment or line.
(2) Rated current: This refers to the rated current of both the fuse and the fuse element, which is the current that flows through it for a long time. It is generally 1.5 to 3 times the rated current of the equipment.
(3) Rated breaking capacity: This refers to the ability to reliably interrupt overload or short-circuit current under fault conditions. It is generally expressed in terms of breaking current or breaking capacity.
(4) Insulation level: This is generally expressed in terms of power frequency withstand voltage and lightning impulse withstand voltage.
(5) Time-current characteristic: This refers to the relationship between the operating time of the high-voltage current-limiting fuse and the current flowing through the fuse, which is provided by the manufacturer. This is essential for fuse selectivity; otherwise, undesirable consequences such as cascading tripping may occur.
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