The structural composition, principle and use of high voltage drop out fuse

Cut-out fuses.

It is the most commonly used short-circuit protection switch for 10kV distribution line branch lines and distribution transformers, which has the characteristics of economy, convenient operation and strong adaptability to the outdoor environment, and is widely used in 10kV distribution lines and distribution transformers on the primary side as a protection and equipment projection and switching operation.

Tianheng high-voltage cut-out fuse.

Principle and use: fuse.

The moving contacts at both ends of the tube are tied tightly by fuses (melts) to push the upper moving contacts in"Duckbill"After the protruding part, the upper static contact made of phosphor copper sheet is pressed against the upper moving contact, so the fuse tube is firmly stuck"Duckbill"Village. When the current is short-circuited.

When the fuse is blown out, an arc is generated, and the steel paper tube lined with the fuse tube produces a large amount of gas under the action of the arc, and the gas is sprayed out at the lower end because the upper end of the fuse tube is sealed, and the arc is blown out. Due to the fuse blowing, the up and down moving contacts of the fuse tube lose the tightening force of the fuse, and under the action of the gravity of the fuse tube itself and the spring of the upper and lower static contacts, the fuse tube falls rapidly, so that the circuit is disconnected, and the fault section line or faulty equipment is cut off. One of the reasons why the fuses on the distribution transformer in the real 10kV line system and the distribution transformer cannot function correctly is that the electrician has poor quality and a sense of responsibility.

It is not strong, and the maintenance and overhaul of the drop-out fuse is not carried out all year round; The second reason is that the quality of the drop-out fuse is inferior and cannot be flexibly pulled and closed. Two reasons reduce the functionality of the cut-out fuse. In reality, there is often a lack of melt, a lack of melt, or the use of copper wire, aluminum wire or even iron wire hook instead of melt.

The trip rate of the line and the failure rate of the distribution transformer.

High. <>

The cut-out fuse is suitable for power systems with a frequency of 50Hz and a rated voltage of 35kV and below, and is installed on the high-voltage side of the distribution transformer or the main line of the distribution. The main function is that the protection performance is not high, it can be used with the isolation switch, instead of the automatic air switch; It can also be used in conjunction with a load switch in place of a costly circuit breaker. It also has short-circuit protection, overload and isolation circuitry.

What is a drop-out fuse, what is the function of a drop-out fuse, for ordinary people will not know and understand it, but what if you need to use such knowledge? Today, let's briefly introduce a drop fuse to you, so that it is convenient for people to learn about it. What is the first thing to introduce when introducing something?

It's not the parameters and structure, but the function and the environment in which it is used, which is what a buyer wants to know the most. First of all, a brief introduction to the working environment and its role. The drop-out fuse is mainly used in the transmission and distribution lines of the power plant, and these places are the places where the drop-out fuse is more common, but this does not mean that it can only appear here, not only in the power station, but also in the outdoors.

So what is it for? The drop-out fuse can be seen from the name above that it has the function of a fuse, that is, it has the role of overload protection and short-circuit protection, and it also has the purpose of dividing and closing the rated load current. So why is it drop-off?

This is due to the reason for its working principle, the drop-out fuse is to disconnect the fuse wire through the fuse's Chang roll, so that the dynamic contacts above and below the fuse tube lose the tension of the Beishan fuse, so under the weight of the upper and lower static contact springs and their own, the fuse tube will fall down quickly, and the drop-out fuse will be disconnected, so as to cut off the faulty electrical circuit or faulty equipment to protect them from the damage of short circuit or overload.

The above is Hebei Senrui Electric Power Equipment Co., Ltd. sorted out about "a few points about the precautions for maintenance of the drop fuse", if you don't understand, welcome to log in to the fuse manufacturer (

Hello dear, the fused parts used in drop-out high-voltage fuses are insulated tubes, also known as fuse tubes or fuse tubes. An insulating tube is a tubular item made of an insulating material, which is used for short-circuit protection and overload protection in current-carrying lines. In the drop-out high-voltage fuse, the insulating pipe is filled with a fuse, which is instantly blown when overloaded or short-circuited, which plays a role in protecting the line and equipment.

The fuse tube plays a very important role in protecting the circuit and preventing arcing. [happy muffled] <>

Summary. The specific choice of fuse carrier material needs to consider the characteristics and requirements of the circuit, as well as the use environment and requirements of electrical equipment. Generally speaking, the fused parts used in the drop-out high-voltage fuse can work stably in a high voltage and current environment, and have the characteristics of high temperature resistance, vibration resistance, waterproof, explosion-proof and so on, to ensure the normal operation of electrical equipment.

The fused parts used in the drop-out high-voltage fuse are not insulated pipes.

Hello dear<>

The fused part used in the drop-out high-voltage fuse is an insulated pipe <>

However, it should be noted that the fused parts used in the drop-out high-voltage fuse are generally high-voltage insulating pipes, rather than ordinary insulating pipes!

High-voltage insulating pipes are usually made of high-strength insulating materials such as alumina or zirconia, which can have stable insulation performance in high-voltage environments. The function of the fuse is to fix and protect the fuse, separate the fuse in the event of short circuit or overload, and avoid beam overload or rubber damage. <>

The specific choice of which flux carrier material needs to consider the characteristics and requirements of the circuit, as well as the use environment and requirements of electrical equipment. Generally speaking, the fused parts used in the drop-out high-voltage fuse can work stably in a high voltage and current environment, and have the characteristics of high temperature resistance, vibration resistance, waterproof, explosion-proof and so on, so as to ensure the normal operation of electrical equipment. <>

Where to like. Dear, it's <> in the order management in the lower left corner

The low-voltage fuse consists of a fuse (referred to as the melt), a fuse base and a fuse support.

Low-voltage fuse is a kind of low-voltage electrical appliance that blows one or several specially designed melts to break the circuit with the heat generated by it when the current exceeds the specified value and after a certain period of time. A fuse is an electrical appliance that melts the melt and disconnects the circuit with the heat generated by itself when the current exceeds the specified value.

Fuses

The fuse melts the melt according to the heat generated by itself after the current exceeds the specified value for a period of time, so that the circuit is disconnected; A kind of current protector made by using this principle. Fuses are widely used in high and low voltage power distribution systems and control systems and electrical equipment, as a short-circuit and over-current protector, is one of the most widely used protection devices.

An electrical appliance that uses a metal conductor as a melt in series in a circuit, and when an overload or short-circuit current passes through the melt, it is blown due to its own heating, thereby breaking the circuit. The fuse has a simple structure and is easy to use, and is widely used as a protective device in power systems, various electrical equipment and household appliances.

The above content reference:Encyclopedia – Fuse

The structure of the low-voltage fuse is: simple structure, easy to use, low cost and other advantages, and is widely used in low-voltage systems.

1. The melting point of the melt is low, the resistance is large, and the cross-section is small.

2. In the process of melt blowing and cutting circuit, arc will be generated, in order to extinguish the arc safely and effectively, the melt is generally installed in the fuse shell, and measures are taken to quickly extinguish the arc.

3. The rated current of the melt is not equal to the rated current of the fuse, and the rated current of the slag qin swimming melt is selected according to the load current of the protected equipment, and the rated current of the fuse should be greater than the rated current of the melt, which is determined with the main electrical appliance.

Possession Type:

1. Porcelain plug-in fuse (RC1A): The porcelain plug-in fuse is composed of five parts: porcelain cover, porcelain low, moving contact, static contact and fuse. Porcelain cover and porcelain low are electrician porcelain titles, power line and load line can be connected to the static contact at both ends of the porcelain low respectively, there is a cavity in the middle of the porcelain low seat, and the protruding part of the cover constitutes an arc extinguishing chamber.

The RC1A fuse** is inexpensive and easy to replace, and is widely used in circuit break protection for lighting and small capacity motors.

2. Screw fuse (RL): The screw fuse is mainly composed of porcelain cap, fuse tube, porcelain sleeve, upper terminal, lower terminal and seat.

3. In addition to the fuse, the fuse of the RL1 series spiral fuse is filled with quartz sand around the fuse for extinguishing the arc. There is a small red dot at the upper end of the fuse tube, and the red dot will automatically fall off after the fuse is blown off, indicating that the fuse has been blown out. When using, insert the end of the fuse tube with a red dot into the porcelain cap, the porcelain cap has a screw like a pin pattern, and the nut is screwed into the porcelain low seat together with the fuse tube, and the fuse will be connected to the circuit.