What is a protective relay?
The protective relay is a device that burns or opens, when detecting a failure. It monitors the electrical circuit for a set of parameters such as voltage and time, and when detecting the overload conditions, the circuit breaker stumbles. The parameters of the protective relay are optional, unlike the switching relay in which the parameters are fixed. This causes the perimeter to stumble when it reaches the threshold. On the other hand, industrial circuit breakers require a protective relay that signals circuit breakers when to open. These types of circuit breakers have an electromagnetic coil called a cruise coil that opens the circuit when activated. The protective relay activates the Trip Coil if the circuit meets the specified congestion conditions.
The design of the protective relay can be sophisticated. Common components of the protective relays Place induction discs, operating coils, shaded pole magnets and solenoid operators. The first protective relay was purely electromechanical devices, but modern protective relays are used by microprocessors. A protective relay based on a microprocessorU are more accurate than electromechanical versions and usually perform multiple functions.
The protective relay can respond to different conditions. The superiority state occurs when the voltage in the circuit is above the desired voltage. Similarly, excessive voltage stands when the perimeter voltage is above the desired level. Common and insufficient frequency conditions are also common types of district disorders. Some protective relays can also estimate the distance to the failure.
Rewritten relay is a common type of protective relay. It is usually connected to the transformer and calibrated to the desired maximum current. Thecontacts in the relay work when the current in the circuit exceeds this level, breaking the circuit.
distance relay is a general type of protective relay that detects the distance to the failure. This is the most common type of protective relay on a high voltage transfer line. Remote relay detects the current and voltage on the circuit. Impedance on oneThe distance on the circuit is a known amount that allows the relay to calculate the distance to the failure.