WHAT ROLE DO TERMINAL BLOCKS PLAY AS SECONDARY EQUIPMENT PROTECTION？

If we want to deeply understand the meaning of the article title, we must first understand what the terminal is, and what is the concept of secondary equipment. Many people may be completely unfamiliar with the name of the terminal block, but in fact, many of our daily life still use wire terminal blocks.

What is a secondary device？

The power system is an electrical energy production and consumption system consisting of power plants, transmission and transformation lines, power supply and distribution stations, and power consumption. Its function is to convert the primary energy in the natural world into electrical energy through power generation devices, and then supply electrical energy to users through power transmission, transformation and distribution. In order to achieve this function, the power system also has corresponding information and control systems at all links and at different levels. It measures, regulates, controls, protects, communicates and dispatches the production process of electrical energy to ensure that users get safe and high-quality electrical equipment. The equipment section of the power system is divided into primary equipment and secondary equipment.

Primary equipment refers to electrical equipment that is directly used for production, transformation, transportation, grooming, distribution, and use of electrical energy and high voltages in control loops (secondary equipment). Primary electrical circuits that are interconnected by primary equipment to form power generation, transmission, distribution, or directly used in production are called primary circuits or primary wiring systems.

The "primary" refers to the "main road" in power production, and the "secondary" is mainly used to control the "primary". The use of "primary" to modify the equipment is mainly to reflect that the equipment belongs to the main circuit or the voltage level of the equipment is higher than If we want to deeply understand the meaning of the article title, we must first understand what the terminal is, and what is the concept of secondary equipment. Many people may be completely unfamiliar with the name of the terminal block, but in fact, many of our daily life still use wire terminal blocks.

What is a secondary device？

The power system is an electrical energy production and consumption system consisting of power plants, transmission and transformation lines, power supply and distribution stations, and power consumption. Its function is to convert the primary energy in the natural world into electrical energy through power generation devices, and then supply electrical energy to users through power transmission, transformation and distribution. In order to achieve this function, the power system also has corresponding information and control systems at all links and at different levels. It measures, regulates, controls, protects, communicates and dispatches the production process of electrical energy to ensure that users get safe and high-quality electrical equipment. The equipment section of the power system is divided into primary equipment and secondary equipment.

Primary equipment refers to electrical equipment that is directly used for production, transformation, transportation, grooming, distribution, and use of electrical energy and high voltages in control loops (secondary equipment). Primary electrical circuits that are interconnected by primary equipment to form power generation, transmission, distribution, or directly used in production are called primary circuits or primary wiring systems.

The "primary" refers to the "main road" in power production, and the "secondary" is mainly used to control the "primary". The use of "primary" to modify the equipment is mainly to reflect that the equipment belongs to the main circuit or the voltage level of the equipment is higher than the voltage level of the secondary equipment.

Secondary equipment refers to the low-voltage electrical equipment required to monitor, control, regulate, and protect the work of the primary equipment and to provide operating and maintenance personnel with operating conditions or production command signals, such as fuses, control switches, relays, control cables, etc. The secondary equipment that is connected to each other and constitutes the monitoring, control, regulation and protection of the primary equipment is called secondary equipment.

What is a terminal？

Our more professional understanding of terminal blocks should be: a terminal block is an accessory product used to achieve electrical connection, and it is industrially divided into the category of connectors. With the increasing degree of industrial automation and the increasingly strict and precise industrial control requirements, the use of terminal blocks has gradually increased. With the development of the electronics industry, the range of use of terminal blocks is increasing, and the types are increasing. In addition to PCB board terminals, the most widely used are hardware terminals, nut terminals, spring terminals, etc.

The terminal was born for the convenience of wire connection, and is a kind of accessory product used to realize electrical connection. The metal conductor is encapsulated in an insulating plastic piece, and there are holes at both ends where the wire can be inserted. For example, if there are two wires, sometimes they need to be connected and sometimes they need to be disconnected. Then you can connect them with terminal blocks, and they can be disconnected at any time without having to solder them or twist them convenient.

The role of the terminal

In short, from the point of use of the terminal, the function that should be achieved is: the place where the contact should be conducted must be conductive, and the contact is reliable. Where the insulation part should not be conductive, it must be reliably insulated.

According to the definition of the terminal above and the role of the secondary equipment, it can be seen that the role of the terminal is applied to facilitate the connection of the wire. The ground terminal is a dedicated terminal for the ground wire. The electricity in China is a three-phase four-wire system. Neutral and ground are separated. The ground wire is usually connected to the ground wire of the socket to protect electricity safety. The metal conductor inside the terminal is the core part of the terminal. It transmits the voltage, current, or signal from the external wire or cable to the corresponding contact piece of the corresponding connector. Therefore, the contact must have an excellent structure, stable and reliable contact holding force, and good electrical conductivity.

In addition, the terminal has the advantage of making the wiring convenient and simple, safe and stable. However, due to the fierce market competition, the quality of many terminals is not up to standard, so you should try to choose a more credible brand when buying. Under different classifications, the total number of connection terminals has even reached tens of thousands: plug-in type, fence type, spring type, wall type and so on.

In the application environment where the current is large and the voltage is strong, it is best to use a fence-type terminal. In this case, it can effectively protect the safety of personnel and provide a more effective and reliable link. Once you encounter the crimping and threaded self-locking design, it is a rail-type terminal block, which can be used with a variety of accessories, such as shorting bars, baffles, etc. Generally, on the construction site, through-wall terminal blocks are used more. Its insulation performance is better. After wiring, it can work directly outdoors. Therefore, some wiring steps can be reduced or omitted directly. In the working environment, it is more important to choose the right terminal block.

After using for a long time, the terminal will also have some obvious faults, such as contact, poor fixing and so on. Therefore, it is necessary to learn to solve these problems in a timely manner. We can adopt instantaneous disconnection detection, single-hole separation detection, continuity detection, etc. At the same time, we need to perform other technical tests to prevent other potential problems.

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