An overload protection device is installed to prevent the main power line from overheating and damage to the protector due to overload. Let me tell you about it now, everyone is welcome to read!
An overload protection device is installed to prevent the main power line from overheating and damaging the protector due to overload.
The amount of current that is allowed to pass continuously in an electrical circuit without overheating the wire is called the safe ampacity or safe current. If the current flowing through a conductor exceeds the safe carrying capacity, it is called conductor overload. The maximum allowable operating temperature of general wires is 65°C. During overload, if the temperature exceeds this temperature, the insulation will rapidly age and even the circuit will burn.
In machinery, when the shaft exceeds the load it can bear, overload protection can prevent equipment damage caused by overload.
The main reasons for overloading
The main reasons for overloading are improper selection of conductor cross-section and the actual load has exceeded the safe current of the conductor; there is also the phenomenon of "a small horse pulling a big cart" , that is, too many high-power devices are connected to the line, exceeding the load capacity of the distribution line. Lighting lines in important material warehouses, residential areas and public buildings, power lines that may cause wires or cables to be overloaded for a long time, and insulated wires with flammable sheaths laid in flammable or refractory buildings When installing components, overload protection should be taken. Automatic switches should be used for line overload protection. During execution, the automatic switch long-delay action setting current should not be greater than the long-term allowable load current of the line. If a fuse is used for overload protection, the rated current of the fuse melt should not be greater than the long-term load current of the line. When an automatic switch is used as a protection device, its current release should be installed on the phase line in a three-phase four-wire system with a grounded neutral point; in a three-phase four-wire system with an ungrounded neutral point, It is allowed to be installed on two phases; in an ungrounded two-phase two-wire system, it is allowed to be installed on one phase.
Let me introduce the motherboard to you next
Motherboard
Computer chassis motherboard, also called motherboard mainboard, system board systemboard or motherboard motherboard; it is divided into two types: commercial motherboard and industrial motherboard. It is installed in the chassis and is one of the most basic and important components of the microcomputer. The motherboard is generally a rectangular circuit board, on which the main circuit systems that make up the computer are installed. Generally, there are BIOS chips, I/O control chips, key and panel control switch interfaces, indicator light connectors, expansion slots, motherboards and sockets. The card's DC power supply is connected to external components such as plug-ins.
The motherboard adopts an open structure. Most motherboards have 6-15 expansion kit slots for the control card interface cards of PC peripheral devices. By replacing these plug-in cards, the corresponding subsystems of the microcomputer can be upgraded regionally, allowing manufacturers and users to have greater flexibility in configuring models. In short, the motherboard plays a pivotal role in the entire microcomputer system. It can be said that the type and grade of the motherboard determines the type and grade of the entire microcomputer system. The performance of the motherboard affects the performance of the entire computer system.
Motherboard English: Motherboard, Mainboard, Mobo for short; also known as motherboard, system board, logic board, motherboard, bottom board, etc., is the center or main circuit board that constitutes complex electronic systems such as electronic computers. ?