Failure analysis and device defects of disconnect blade fuse cutout

A fuse is an electrical appliance that uses the heat generated by itself to fuse the melt and disconnect the circuit when the current exceeds the specified value. The disconnect blade fuse cutout is based on the current exceeding the specified value for some time, the melt is melted by its heat, thereby breaking the circuit. The disconnect blade fuse cutout is widely used in high and low-voltage power distribution systems, control systems, and electrical equipment, as a short-circuit and over-current protector. The disconnect blade fuse cutout is one of the most commonly used protection devices. Next, let's take a look at the failure analysis and device defects of the disconnect blade fuse cutout. Here are some answers.

Here is the content list:

• Failure analysis of disconnect blade fuse cutout.

• Device defect of disconnect blade fuse cutout.

Failure analysis of disconnect blade fuse cutout.

In theory, fuse protection played a role. However, the fuse of the disconnect blade fuse cutout is abnormally blown according to time and weather laws. From July to August each year, the temperature is high, the electricity load is large, the load of the distribution transformer rises quickly, and the fuse blown out of the tube faults occur frequently. This shows that the fuse of the disconnect blade fuse cutout is abnormally blown. The reasons are as follows: First, the fuse capacity and the distribution transformer capacity are not properly configured, which fails to meet the technical standards for fuse configuration. Second, the quality of the fuse is not close, and the fusing characteristic is relatively poor.

The fuse of the disconnect blade fuse cutout has no special time rule and weather rule due to rolling injury. From the analysis of the broken position of the fuse body, it is found that one is the bolts fixed at both ends of the fuse, and the other is the corner of the metal casting at both ends of the fuse tube. The reasons for the fuse disconnect blade fuse cutout are as follows: First, when the bolt is tightened, the end of the fuse will revolve and break the strand along with the rotation of the bolt. Second, due to the concave and convex sharp edges at the corners of the metal castings at both ends of the fuse tube, after the fuse is fixed and tightened, after a period of operation, affected by the mechanical vibration, the fuse is cut and broken.

When the fuse is used on the disconnect blade fuse cutout, it is under stress for a long time. When replacing the fuse, if it is too tight or too loose, after a period of operation, due to the influence of the natural environment, mechanical vibration, and long-term force, the fuse will be pulled out in an over-tight state, or the fuse is elongated and loosened compared to the original replacement, causing tube drop failure. The reasons for the loosening of the fuse of the disconnect blade fuse cutout are as follows: First, when replacing the fuse, the adjustment force is not appropriate. Second, the fuse is loosely pulled out, which mainly refers to the fuse body being pulled out from the crimping place with the multi-strand tail wire. This type of problem is a product quality problem of the manufacturer. Third, the disconnect blade fuse cutout has been running for a long time, especially if the load is small for a long time, and the fuse tube has water ingress and dampness to cause the fuse to break.

Device defect of disconnect blade fuse cutout.

First, the disconnect blade fuse cutout process is rough, the manufacturing quality is poor, and the elasticity of the contact spring is insufficient, resulting in poor contact and spark overheating. Second, the rated breaking capacity of the disconnect blade fuse cutout is small, and its lower limit is less than the three-phase short-circuit capacity of the protected system. Third, the size of some new switch fuse tubes does not match the size of the fixed contact part of the disconnect blade fuse cutout, and it is easy to loosen. Once encountered external force, vibration, or windy weather during operation, it will accidentally move and fall, which not only reduces. In addition, it is difficult to guarantee the reliability index of the power supply.

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