in case of cumulative generator series field flux and main field flux are of same direction and in case of a differential compound generator series field flux and main field flux opposes each other.
CUMULATIVE COMPOUND MOTOR
It is one in which series field is so connected that it assists the field due to shunt winding.The armature torque is increased under heavy load at starting.As the load increases,the speed decreases in the same way as in series motor.When the load is increased suddenly the shunt field prevents the motor from speeding up beyond the safe value.
DIFFERENTIAL COMPOUND MOTOR
It is one in which winding is so connected that the field due to it opposes that due to shunt winding.It tends to keep the speed constant.When starting up the motor,the series windin is required to be short circuited otherwise the series field winding would rise to its full value before shunt field.This will cause the motor to start in the wrong direction,at high speed.
Differential compounded generators are used in Ward Lenard motor generator loops. The shunt fields on these generators are separately excited and when the shunt field polarity is reversed by the controller the series field helps drive the generator voltage to zero thus aiding in the reversal of current.
The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.
An industrial generator has some form of built-in cooling system. A marine generator relies on pumping water from the lake or ocean the vessel is in for cooling.
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a motor Will do work by consuming power a generator is just the opposite
differential protection
Differential compounded generators are used in Ward Lenard motor generator loops. The shunt fields on these generators are separately excited and when the shunt field polarity is reversed by the controller the series field helps drive the generator voltage to zero thus aiding in the reversal of current.
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.
Equalizing connections are required when parallelingtwo compound generators and paralleling two Series generator .
the fundamental difference between a battery and a generator is that a battery uses chemicals
Differential compounded generators are used in Ward Lenard motor generator loops. The shunt fields on these generators are separately excited and when the shunt field polarity is reversed by the controller the series field helps drive the generator voltage to zero thus aiding in the reversal of current.
The difference between a commercial power generator and a regular power generator is that a commercial one is much expensive than the regular one. It's much better to purchase the regular generator if your not planning to use it for business purposes.
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The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.
To the untrained eye, they appear identical in both form and function.
An industrial generator has some form of built-in cooling system. A marine generator relies on pumping water from the lake or ocean the vessel is in for cooling.
magneto is dc