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China 15kV Drop-Out Fuse Cutout Suppliers - Reliable Factory for 10kV Distribution Line Protection
Working Principle
The moving contacts at both ends of the fuse tube are fastened by the fuse (melting element). After pushing the upper moving contact into the protruding part of the "duckbill", the upper static contact made of phosphor copper sheet etc. presses against the upper moving contact, so that the fuse tube is firmly clamped in the "duckbill". When the short-circuit current passes through and fuses the fuse, an electric arc is generated. The steel paper tube lined inside the fuse tube produces a large amount of gas under the action of the electric arc. Since the upper end of the fuse tube is sealed, the gas is sprayed downward to extinguish the arc. Due to the fuse melting, the upper and lower moving contacts of the fuse tube lose the tension of the fuse. Under the action of the fuse tube's own gravity and the spring sheets of the upper and lower static contacts, the fuse tube falls rapidly, disconnecting the circuit and cutting off the faulty line section or faulty equipment.
Applicable Environment
The 10kV drop-out fuse is suitable for outdoor places where the ambient air is free of conductive dust, corrosive gases, flammable, explosive and other hazardous environments, and the annual temperature difference ratio is within ±40℃. Its selection is based on two parameters: rated voltage and rated current, that is, the rated voltage of the fuse must match the rated voltage of the protected equipment (line).
Installation Tips
1
During installation, the melting element should be tightened (so that the melting element is subjected to a tension of about 24.5N), otherwise it is easy to cause contact heating.
2
The fuse should be firmly installed on the crossarm (frame) without any shaking or wobbling.
3
The fuse tube should have a downward inclination angle of 25°±2° to facilitate the rapid fall of the fuse tube by its own weight when the melting element fuses.
4
The fuse should be installed on a crossarm (frame) with a vertical distance of not less than 4m from the ground. If installed above the distribution transformer, it should maintain a horizontal distance of more than 0.5m from the outermost contour boundary of the distribution transformer to prevent other accidents caused by the falling of the fuse tube.
5
The length of the fuse tube should be adjusted appropriately. It is required that after closing, the duckbill tongue can hold more than two-thirds of the contact length to avoid accidental self-falling during operation. The fuse tube should not push the duckbill to death to prevent the fuse tube from failing to fall in time after the melting element fuses.
6
The melting element used must be a standard product from regular manufacturers and have a certain mechanical strength. Generally, the melting element is required to withstand a tension of at least 147N.
7
The 10kV drop-out fuse is installed outdoors, requiring an phase-to-phase distance greater than 70cm.
Applicable Environment
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Frequently Asked Questions
Q: How does a 10kV drop-out fuse extinguish an electric arc?
When a short-circuit current fuses the element, an arc is generated. The steel paper tube inside the fuse tube produces a large amount of gas under the heat of the arc. Since the top end is sealed, the gas is forced downward, effectively blowing out and extinguishing the arc.
Q: What causes the fuse tube to fall down after melting?
Once the fuse element melts, the upper and lower moving contacts lose their tension. Under the combined forces of the fuse tube's gravity and the spring sheets on the static contacts, the tube drops rapidly to disconnect the circuit.
Q: What are the environmental limitations for outdoor installation?
It must be installed in outdoor areas free of conductive dust, corrosive gases, and flammable or explosive hazards. The annual temperature variation should remain within the range of ±40℃.
Q: Why is the installation angle of the fuse tube critical?
The fuse tube must be installed with a downward inclination angle of 25°±2°. This specific angle ensures that gravity can reliably and quickly pull the tube down to disconnect the line once the melting element fuses.
Q: What are the height and distance safety requirements?
The fuse must be installed at least 4m above the ground. If positioned above a distribution transformer, it must maintain a horizontal distance of more than 0.5m from the transformer's outermost edge to prevent damage from the falling tube.
Q: What tension requirements apply to the melting element?
During installation, the melting element must be tightened to a tension of approximately 24.5N to prevent contact heating. The element itself must be a standard product capable of withstanding a mechanical tension of at least 147N.
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