OFFSET IMPEDANCE RELAYOffset impedance relay is also known under names ADMITTANCE RELAY or MHO RELAY
, The zone of protection for 2 , 3 or multi windings transformers differntial relay is decided by the location of CT.s at the respective sides i.e. HV. IV OR LV SIDES . Ideally on any fault within zones of these C.T.s the differential relay should act. However sometimes inadequecy of C.T. s ratings like low burden rating, less knee point voltage or improper biased settings may cause the differential relay to operate even on line faults. Regards, J.M.SHAH
The relay's coil(s) would be a load, but the main function of a relay is to act as a switch to control power to a larger load.
A Buchholz relay is designed to detect a failing oil-filled power transformer. It will automatically disconnect the transformer and produce an alarm signal.
Plogrammable logic array is the set of instructions which makes and breaks the circuit.
when the cable of a motor shorted then differetial relay act
differential protection relay
when the cable of a motor shorted then differetial relay act
CT's are used as inputs to the differential. If the CT is bad, or it is not wired to the differential correctly, it will cause differential current to be seen by the relay, resulting in a trip.
An equation where some terms are derivatives of functions. Usually the problem is to find the function that makes the equation true.
The differential of the sine function is the cosine function while the differential of the cosine function is the negative of the sine function.
function of static relay
function of static relay
Power Transformer
The derivative refers to the rate at which a function changes with respect to another measure. The differential refers to the actual change in a function across a parameter. The differential of a function is equal to its derivative multiplied by the differential of the independent variable . The derivative of a function is the the LIMIT of the ratio of the increment of a function to the increment of the independent variable as the latter tends to zero.
your mom idiot
They're completely different, used for different applications (usually). A distance relay uses both current and voltage. A differential relay uses only current. A differential relay usually has harmonic restraint capability, while distance relays ideally track system frequency. Differential relays require fast operation, while distance relays may not be required to operate as quickly. Distance relays have more issues with operating for out of zone problems than differential relays. There are many more, but this gives an idea.