PT, voltage transformer, spelled Phase voltage Transformers in English, is a conversion device that proportionally changes the high voltage on the primary side into a rated voltage of 1V suitable for instruments or relays.
CT (Current Transformer), spelled current transformer in English, is a conversion device that converts the large current at the primary side into a rated current of 5A or 1A, which is suitable for use by instruments or relays.
distribution box is a massive parameter in data, which generally constitutes a low-voltage forest. According to electrical wiring, it is required to assemble switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen to form a low-voltage distribution box. During normal operation, the circuit can be turned on or off by manual or automatic switch.
the purpose of the distribution box is to distribute the electric energy reasonably and facilitate the opening and closing operation of the circuit. It has a high level of safety protection, and can directly display the on-state of the circuit.
The commonly used distribution boxes are made of wood and metal. Because the protection level of metal distribution boxes is higher, metal distribution boxes are used more.
(1) fixed panel switchgear, often called switchboard or distribution panel. It is an open switch cabinet with a panel cover, which has a protective effect on the front, and the back and sides can still touch the live parts, so the protection level is low. It can only be used in industrial and mining enterprises with low requirements on power supply continuity and reliability, and can be used for centralized power supply in transformer rooms.
(2) Protective (i.e. enclosed) switchgear refers to a low-voltage switchgear with all sides closed except the installation surface. The electrical components such as switch, protection, monitoring and control of this cabinet are all installed in a closed shell made of steel or insulating material, which can be installed reliably on or off the wall. Each loop in the cabinet can be isolated without isolation measures, or it can be isolated by grounded metal plate or insulation board. Usually, the door is mechanically interlocked with the main switch operation. In addition, there is a protective table-type switchgear (console), and the panel is equipped with electrical appliances such as control, measurement and signal. Protective switchgear is mainly used as power distribution device in process site.
(3) drawer-type switch cabinet. This kind of switchgear adopts a closed shell made of steel plate, and the electrical components of the incoming and outgoing circuits are all installed in drawable drawers, which constitutes a functional unit that can complete a certain type of power supply task. The functional unit is separated from the bus or cable by a grounded metal plate or a functional plate made of plastic to form three areas: bus, functional unit and cable. There are also isolation measures between each functional unit. Drawer switchgear has high reliability, safety and interchangeability, and is a relatively advanced switchgear. Most of the switchgear refers to drawer switchgear. They are suitable for industrial and mining enterprises and high-rise buildings that require high reliability of power supply as centralized control distribution centers.
(4) Power and lighting distribution control box. Mostly closed vertical installation. Due to different use occasions, the protection level of the shell is also different. They are mainly used as power distribution devices in production sites of industrial and mining enterprises. Shanghai Shilin Electric Appliance Co., Ltd. is a high-tech enterprise focusing on the production of safety distribution boxes, surge protectors and safety low-voltage electrical appliances in China. Shanghai Shilin Company relies on many years' accumulated experience in the production of safety electrical appliances, excellent product quality and good after-sales service. Over the years, we have been pursuing to be the safest electrical products and giving happiness to every family. The product has passed the CCC certification of compulsory products in China, which is a product conformity assessment system implemented by governments of various countries in accordance with laws and regulations to protect consumers' personal safety and national security, strengthen product quality management. In addition, it has passed the IS91 international quality management system certification, and the company is also listed as a member enterprise of the Terminal Electricity Branch of the National Electrical Standards Committee. It follows the enterprise tenet of "science and technology as the foundation, quality as the guarantee, and service as the core", and through continuous improvement of the software and hardware facilities of the enterprise, it ensures that the terminal appliances produced by Shanghai Shilin are safe and leading in the industry. Some of the products produced have been listed in the "Spark Plan" products in Shanghai, recommended by the Sichuan Provincial Construction Committee and recommended by the Ministry of Construction, and won the gold medal in the Ten-year Achievement Expo of Patent Technology. Ensure the quality of every finished electrical appliance with the mentality of being a world brand. At the time of vigorously promoting the reconstruction project of the two networks in China, the company adheres to the idea of "safe electrical appliances, happy home", independently develops and develops the rural network product-intelligent comprehensive leakage protector, which has been included in the Sichuan architectural standard design Sichuan 2 D41 Atlas. The 21st century is the era of knowledge economy, creating excellent quality of safety products, devoting itself to the prosperity of the electrical industry, implementing the customer satisfaction project, scaling up the market operation, and becoming the first supplier of safety distribution electrical appliances in China.
the distribution box is a low-voltage distribution box that assembles switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to the electrical wiring requirements. During normal operation, the circuit can be turned on or off by manual or automatic switch. In case of fault or abnormal operation, cut off the circuit or give an alarm with the help of protective appliances. By means of measuring instruments, various parameters in operation can be displayed, and some electrical parameters can be adjusted to prompt or signal deviations from normal working conditions.
I hope I can help you solve your doubts.