What is the critical resistance of DC shunt generator?
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What is the critical resistance of DC shunt generator?
The critical field resistance (RC) of a DC shunt generator is defined as the maximum field circuit resistance with which the shunt generator would just excite. The voltage build-up in a shunt generator depends upon field circuit resistance.
What is critical speed and critical field resistance of DC shunt generator?
Answer:Critical Field Resistance: It is that value of the field resistance at which the D.C. shunt generator will fail to excite. Critical Speed: It is that speed for which the given shunt field resistance becomes the critical field resistance.
What do you mean by critical speed of shunt generator?
What is Critical Speed of DC Shunt Generator? Critical speed is defined as the speed at which the given shunt field resistance is equal to the critical resistance. It is the speed at which the shunt generator just fails to build up its voltage without any external resistance in the field circuit. It is denoted by Nc.
How do you find critical resistance?
The steps are,
- Drawn O.C.C. for given speed N1.
- Draw a line tangential to this O.C.C. say OA.
- Draw a line representing the given Rsh say OP.
- Select any field current say point R.
- Draw vertical line from R to intersect OA at S and OP at T.
- Then the critical speed NC is,
What is DC shunt generator?
A shunt generator is a type of direct current electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current.
What is the relation between critical resistance and speed?
The speed for which the given field resistance acts as critical resistance is called the critical speed. The critical speed is directly proportional to critical resistance.
What is shunt DC generator?
What is a DC Shunt Generator? It is a type of self-excited generator that has its field winding arranged in parallel with the armature winding. Since the field winding is connected in parallel with the armature it receives less current across it as it is wound with more turns and thin wire.
How do you calculate shunt field resistance?
The resistance value is given by the voltage drop at the maximum current rating. For example, a shunt resistor rated with 100 A and 50 mV has a resistance of 50 / 100 = 0.5 mΩ.