The working principle, function, and use environment of the drop-out fuse

Drop-out fuse is the most commonly used short-circuit protection switch for branch lines and distribution transformers of 10kV distribution lines. It has the characteristics of the economy, convenient operation, and strong adaptability to the outdoor environment. Drop-out fuse is widely used in 10kV distribution lines and distribution. The primary side of the transformer is used for protection and equipment switching and switching operations. Next, I will introduce to you the working principle, function, and use environment of the drop-out fuse. Here are some answers.

Here is the content list:

• The working principle of drop-out fuse.

• The main function of drop-out fuse.

• Outdoor model of drop-out fuse.

• The applicable environment of drop-out fuse.

• Environmental conditions for use of drop-out fuse.

The working principle of drop-out fuse.

In the actual 10kV line system and the fuse on the distribution transformer cannot operate correctly, one of the reasons is that the electrician is poor in quality and has a weak sense of responsibility, and the maintenance and repair of the drop-out fuse are not carried out all year round. The second reason is that the product quality of the drop-out fuse is poor and cannot be flexibly pulled. Two reasons reduce the function of drop-out fuses. In reality, drop-out fuse often appears to lack of melt tube, lack of melt, or use of copper wire, aluminum wire, or even iron wire hook instead of melt. As a result, the trip rate of the line and the failure rate of the distribution transformer remain high.

The main function of drop-out fuse.

Thedrop-out fuse is installed on the branch line of the 10kV distribution line to reduce the power outage range. Because it has an obvious disconnection point, it has the function of an isolating switch, which creates a safe working environment for the lines and equipment of the maintenance section, and increases the safety of the maintenance personnel. The drop-out fuse installed on the distribution transformer can be used as the main protection of the distribution transformer. Therefore, drop-out fuse has been popularized in 10kV distribution lines and distribution transformers.

Outdoor model of drop-out fuse.

Outdoor drop-out fuse is suitable for AC 50HZ, rated voltage 10KV power system, used for overload and short circuit protection of transmission and distribution lines and power transformers, as well as dividing and closing rated load current. There are three widely used outdoor drop-out fuse models: RW7, RW11, and RW12.

The applicable environment of drop-out fuse.

10kV drop-out fuse is suitable for outdoor places where the ambient air has no conductive dust, no corrosive gas, flammable, explosive, and other dangerous environments, and the annual temperature difference ratio is within ±40℃. The selection of drop-out fuse is based on the two parameters of rated voltage and rated current, that is, the rated voltage of the fuse must match the rated voltage of the protected device.

Environmental conditions for use of drop-out fuse.

The normal operating conditions of the drop-out fuse are that the ambient temperature is not higher than +40 degrees and not lower than -40 degrees, the altitude does not exceed 1000m, the maximum wind speed does not exceed 35m/s, and the earthquake intensity does not exceed 8 degrees. The drop-out fuse is not suitable for places with burning or explosion hazards, places with severe vibration or impact, areas with conductive, chemical gas, and severely polluted salt spray.

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