Protection principle, the protected object, the role played by the protection is introduced as follows:
I. The principle of protection is to detect, respond to and deal with faults or abnormalities in the electric power system by means of specific circuits or devices in order to protect the safety and stability of the equipment or system.
II. The protected object can refer to the equipment or system in the power system, or other objects that need to be protected. The following are some common protected objects:
1. Power equipment: such as transformers, transmission lines, circuit breakers, fuses, etc., which are an important part of the power system, need to be protected from damage or failure.
2. Electronic equipment: such as computers, cell phones, sensors, controllers, etc., these devices may be subject to power surges, current shocks and other hazards during operation, and need to be protected to avoid damage or failure.
3. Building electrical systems: such as residential, commercial, industrial buildings, etc. electrical systems, need to be protected to avoid damage or failure due to excessive current, voltage fluctuations and other reasons.
4. Sensitive equipment: such as medical equipment, aerospace equipment, communications equipment, etc., which are very sensitive to fluctuations in electrical parameters such as current and voltage, and need to be protected to avoid damage or failure.
Three, the role played by the protection is in the power system or electronic equipment failure or abnormalities, timely response and take the necessary measures to protect the safety and stability of the equipment or system. The following is the main role played by the protection:
1. Fault isolation: the protection device can detect the fault or abnormal situation in the equipment or system, and isolate the faulty part from the whole system, in order to avoid the spread of faults to other parts of the system, causing greater damage.
2. Fault Detection: The protection device can detect faults or abnormal conditions in the equipment or system, including short circuit, overload, overvoltage, undervoltage, etc., and provide corresponding alarms or instructions.
3. Fault removal: the protective device can remove the fault from the system by cutting off the faulty part or restoring the operation of the normal part in order 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 faulty part, adjusting the power supply voltage, regulating the current and so on, in order to maintain the stable operation of the equipment or system.
5. Communication warning: the protection device can pass the protection information to other equipment or systems through the communication interface, and carry out warning or alarm to remind the relevant personnel to deal with the failure or abnormal situation in time.