Well any type of relay protection is extremely complicated any many people will spend their whole career learning about protection and control. But a distance relay essentialy looks at the impedance of the circuit to be protected. When a fault occurs the impedance of the circuit will change. It then calculates this new impedance to determine where the fault has occurred. By knowing where the fault is it can trip appropriate CB's to isolate the faulted section.
Undervoltage protection is provided for A circuit bars,motors, generators, transformers, rectifiers, etc.. Such protection is given by means of undervoltage relay. Undervoltage relay are necessary for voltage control and reactive power control of network buses and load buses. These type of relays have inverse time characteristics and their operating time reduces twith the reduction in operating voltage. Undervoltage protection is provided for AC circuit bars,motors, generators, transformers, rectifiers, etc.. Such protection is given by means of undervoltage relay. Undervoltage relay are necessary for voltage control and reactive power control of network buses and load buses. These type of relays have inverse time characteristics and their operating time reduces twith the reduction in operating voltage.
Frame relay.
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The use of a DHCP relay agent is an agent that relays DHCP between DHCP clients and DHCP servers on different IP networks. The DHCP relay agent is compliant with RFC 1542.
reactance relay is used for distance protection of the transmission line....
The most common form of protection on high voltage transmission systems is distance relay protection. Power lines have set impedance per kilometre and using this value and comparing voltage and current the distance to a fault can be determined. The ANSI standard device number for a distance relay is 21
No there not same
over current protection relay
LBB is local breaker protection
It has a display distance of 2 meaters.
differential protection relay
The distance relay trips when a fault occurs at a distant or a remote place in the electric transmission line. There is a mechanism based on the impedance calculation of the distance of the transmission line after which it is accurately known where the fault has taken place. Thus the distance protective relay can trip the circuit & prevent the fault to be carried further and also can indicate the location of the fault.
distance relay..........
how the apfc relay work
On a 1997 Ford Contour : The Reverse Voltage Protection relay location is marked ( D1 )
How Negative phase sequence relay work