REF615 Feeder protection and measurement and control device

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FROM：Mr. Wei

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2. General protection principle

The general protection principle is realized by taking the voltage transformer as the main switch. When the line is faulty, the voltage potential difference voltage protection action on the current transformer and capacitor is used to protect the line from the impact of the fault current. When a fault occurs, as long as there is one or more equipment power outage maintenance at the same time, the line can still continue to supply power after the maintenance personnel finish the operation of the faulty equipment, tripping measures are generally taken at this time. At this time, the feeder protection and load switch in the line do not work, and the current transformer cannot be started. At this time, the circuit breaker action signal should be directly connected to the terminal post for tripping operation. This situation usually occurs in large capacity DC transmission systems (such as voltage transformers, capacitors, etc.). If the impact on the tripping current is large, it is necessary to connect the fault load after the circuit breaker, and even to measure and analyze the ground resistance to determine the fault range. If necessary, it is necessary to conduct short-circuit test. At the same time, it is also necessary to have an isolation switch and load switch to prevent the damage caused by short circuit discharge; It is also necessary to have the corresponding configuration of tripping current relay for power off operation until the current returns to normal and then the load switch is closed to avoid the risk of short circuit caused by tripping current. The device mainly uses thyristor and relay, DC converter, power supply switching-off and other components of the main components of the operation principle to achieve the line fault monitoring and corresponding treatment of various devices; In addition, a power supply voltage detection instrument (such as a high-voltage meter, etc.) is equipped as an auxiliary device to collect signals and provide feedback values to corresponding protective appliances for judgment, implementation of operation instructions and issuance of locking action signals, so as to realize online monitoring and corresponding processing of their protective effects (FIG. 2).

3. Common protection methods

According to the function of the protection device, it can be divided into high voltage side contact protection, low voltage side locking protection, line side arrester installation, switch installation and other forms of protection device. Different types of protection points correspond to different protection methods. According to the characteristics of protection equipment, different types of protection points can be divided into closing, automatic, manual and mechanical types of protection devices. The high voltage side feeder protection and low voltage side feeder protection can be protected by the combination of closing protection, automatic protector and automatic switching device. Among them, the closing protection is in the closing state, the feeder circuit breaker action protection; The automatic relay is in the closing state automatically open and shut operation, so that the fault line trip, and provide the corresponding power supply service for the user. In our country power grid, line and equipment failure occurs during operation which causes power supply interruption. In this case, feeder protection device must be used to protect the safe operation of line and equipment, so as to ensure the reliability and stability of power supply as well as voltage quality requirements for users.

4. Scope of application

(1) Power system: transmission lines, transformation equipment, power transformers, cables, etc., can be used as the protection objects of feeder protection devices; (2) Industrial and mining enterprises: cable Wells and tunnels can be used as the protection objects of feeder protection devices; (3 position railway pole, pole tower, electrified railway special distribution equipment can be used as feeder protection device protection objects; (4) Research institutes: including the military, armed police, military, aerospace and other aspects of the unit can also according to its nature, according to the need to install feeder protection device; (5) Large and medium-sized industrial enterprises: including light industry, textile, food, machinery and other enterprises.

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