140CPS12400

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The power supply system indicates that there is no working ground on the power side. The second letter indicates that the load-side electrical equipment is grounded for protection.
When the power supply distance is not very long, the power supply system has high reliability and good safety. It is generally used in places where power outages are not allowed, or where continuous power supply is strictly required, such as electric furnace steelmaking, operating rooms in large hospitals, underground mines, etc. The power supply conditions in underground mines are relatively poor, and cables are susceptible to moisture. Using the power supply system, even if the neutral point of the power supply is not grounded, once the equipment leaks, the single-phase ground leakage current will still be small and will not destroy the balance of the power supply voltage, so it is safer than a system with a grounded neutral point of the power supply.
When a ground fault occurs in the system, the ground fault voltage will not exceed and will not cause the risk of phase-to-phase electric shock.
However, if it is used in a long power supply distance, the distributed capacitance of the power supply line to the earth cannot be ignored. When a short-circuit fault occurs in the load or the equipment shell is electrified due to leakage, the leakage current forms a loop through the earth and the protective equipment may not necessarily operate (the current is less than the rated value of the protective equipment), which is dangerous. It is safer only if the power supply distance is not too long. This power supply method is not used on construction sites.
Dispatch Room
The dispatch room (regional control room) is the unit that dispatches the operation of the regional power grid. Dispatchers must first intern in a substation for a few months to become familiar with the operation of the substation. Then, they must intern in the dispatching room for about half a year. After passing the exam, they can be appointed as deputy dispatchers. The job of a dispatcher feels relatively boring. It is normal to be on the phone all day long and have to work shifts and night shifts. Moreover, there must be no mistakes in dispatching orders. Dispatchers and staff in the method room that prepares the power grid operation mode must have a good grasp of the accident handling of the power grid structure relay protection work, because the difficulty lies in that in the accident state, they are the commanders of accident handling. The advantage is that you are not tired or dirty, you have two days of rest and four days of rest on average, and the bonus is high.
Relay protection class
There are usually several relay protection classes, responsible for the protection work of substations with three or more voltage levels. This is a place where new college students often go and are very knowledgeable. A person engaged in relay protection generally needs at least three or four years of practical work experience to be fully familiar with the protection work of the bureau.
Information Center
Information Center This is also the department where a large number of new students are pouring in. Because the power supply bureau has a centralized control center and adopts an energy management system, most substations can be operated with few people on duty or unattended. The realization of monitoring and computer protection of data collection equipment cannot be achieved without communication. This institute has a particularly large number of young people, most of whom have graduated from computer and communications majors.
A newly launched built-in high-efficiency converter. It adopts a small pin package. The continuous output current is , and the input voltage range is. ~. The converter greatly simplifies the design of load power management, allowing designers to power digital signal processors (DSPs), field-programmable gate arrays, and microprocessors directly from the medium-voltage bus instead of relying on additional low-voltage buses. . (Switch with Integrated Technology) converters with efficiencies of up to 100% are ideal for low-power industrial and commercial power supplies, monitors and TVs with LCD displays, hard disk drives, video graphics cards, and or wall adapter point-of-load regulation device.
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