What is a network protector?
The network protector is a device that monitors the flow of electricity between the interconnected energy systems and automatically disconnects it if the power starts to flow in the opposite direction. It is a protective device that is used in the grid network and shoes to prevent the power flow from the secondary network. Network protectors consist of circuit breakers, relay settings and housing mechanisms. They are mostly used in underground networks of energy distribution to reliable energy provision in high density populations. These areas can be industrial sites, large buildings or even parts of the city. In this way, it is structured to allow the power supply network to function continuous, even if one energy source is lost. Each power source contains a switch, multi -phase bus and transformer. The TWORK non -furnishings connect a multi -phase bus to the network and are usually located in dust resistant housing mechanisms. Housing cases are alsoproof of moisture due to the location of the device; They are mostly found in underground passages in large urban areas.
The housing mechanism protects the relay and circuit breaker from the exposure of elements and handling, which eventually prevents damage. The circuit breaker has contacts that switch between open and closed positions. The relay acts as a device brain and monitors line currents, transformer and network voltage using sensors. Power flows through the network protector when the main contacts are closed in it. If the relay detects a reverse flow of energy or overcurrent situation, it performs algorithms to initiate the switch and tripping the system.
Although this may seem, the network protector protects the secondary network, but prevents the power of energy from it to the primary network. Maintains the dependence and stability of the secondary system. Relays detect faults in the primary feeder and the circuit breaker opens to disconnect the primary feeder from secondsAra nets. This is done because the primary cable is connected to the secondary network via a network transformer. If the power supply is allowed to flow in the opposite way, the primary feeder is powered by the magnetic induction process.
This is a dangerous situation, because the error will continue to be under voltage of the secondary network. The relay in the network protector of the network senses the power with reversing and burns the system to prevent it. If there is an error in the secondary network, the relays will not be covered and the failure will continue to be administered by serving the primary feeder. In such cases, the networks rely on cable limitations to function as fuses, melting to disconnect a secondary failure. Sometimes the cables can burn and the error is isolated. This may be dangerous because the cable does not have to burn and the secondary network will be damaged in the long run due to excessive overload.
Thecontrol relays have reclosers that close the circuit breaker after switching off and the failure was corrected. Electromechanical systems, ZATThe more modern ones are completely electronic. The electronic network protectors calculate the power flow or use the currents and sequential voltages to decide on the decision. Digital sequence -based relays are even able to measure power flows and can communicate these data to remote stations.