1. The protection principle is to detect, respond and handle faults or abnormal situations in the power system through specific circuits or devices, thus protecting the safety and stability of equipment or systems.
Two, the protection object can refer to the equipment or system in the power system, can also refer to other objects that need to be protected. The following are some common protected objects:
1. Power equipment: such as transformers, transmission lines, circuit breakers and fuses. These devices are an important part of the power system and need to be protected from damage or failure.
2. Electronic equipment: such as computers, mobile phones, sensors, controllers, etc. It may be damaged by surge and current shock during work, so it needs to be protected to avoid damage or failure.
3. Electrical system of buildings: For example, the electrical systems of residential buildings, commercial buildings and industrial buildings need to be protected to avoid damage or failure due to excessive current and voltage fluctuations.
4. Sensitive equipment: such as medical equipment, aerospace equipment and communication equipment. These devices are very sensitive to the fluctuation of power parameters such as current and voltage, and need to be protected to avoid damage or failure.
Third, the role of protection is to respond in time and take necessary measures to protect the safety and stability of the equipment or system when the power system or electronic equipment fails or is abnormal. The following are the main functions of protection:
1. Fault isolation: the protection device can detect the fault or abnormal situation in the equipment or system, isolate the fault part from the whole system, and prevent the fault from spreading to other parts and causing greater damage.
2. Fault detection: The protection device can detect faults or abnormal situations in equipment or system, including short circuit, overload, overvoltage and undervoltage, and provide corresponding alarm or indication.
3. Fault removal: The protection device removes the fault from the system by removing the fault part or restoring the normal part to maintain the normal operation of the equipment or system.
4. Protection control: the protection device can control the equipment or system according to the set protection control logic, including disconnecting the fault part, adjusting the power supply voltage, adjusting the current, etc. , so as to maintain the stable operation of equipment or system.
5. Communication early warning: the protection device can transmit protection information to other devices or systems through the communication interface, and give early warning or alarm to remind relevant personnel to deal with faults or abnormal situations in time.