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How we decide the rating and requirement of CBCT?
Generally we use CBCT for earth fault/earth leakage relay tripping. Since the CBCT is going to provide on neutral side, first we have to find the full load current. If the full load current is 500A we have to use 100A/5A (ie 1/5th of full load current) CBCT. arunarafa@gmail.com
Is a relay defect and open load the same?
A relay is basically a controllable switch that connects a supply voltage to a load. If the relay is switch such that the load is not connected, that could be considered an open load. If it is switched the other way the load will be connected to its supply voltage. A defect in a relay would be something that caused it not to function correctly. It could be in the switch portion of the supply portion of the relay. Hence you are referring to different things and a defect may or may not cause the load to be open.
How do you test a solid state relay?
A small light bulb is often used to test a solid state relay (SSR). That is because a SSR needs a minimum load of at least 0.1 amps in order to operate. Using a meter does not provide a sufficient load.
What is thermal overload?
The load current is made to flow through the thermal overload relay, which is actually a bimetalic strip. Beyond a prespecified current the bimetalic strip tend to deflect due to heat (thermal effect) thus cutting off the circuit and hence it acts as an over load relay protection.
Vector diagram for a loaded transformer where the load is resistive?
the ampere i=0is theonlyedge where the e0b and e0c can come together and share the load and that way the two vector diagrams will connected and the load will be less resistive and more on the ek0 and c73 resistive load. the 38f93 relay will be the one to break the load 2u3 and e0b and e0c into diffrent components that will be drawn in the diagram.
