Series Generators in Parallel

Series Generators in Parallel Points : Series Generators in Parallel Two identical series generators connected in parallel. Suppose E₁ and E₁ are initially equal, generators supply equal currents and have equal shunt resistances. Suppose E₁ increases slightly so that E₁ > E₂. In that case, I₁ becomes greater than I₂. Consequently, field of machine 1 is strengthened thus increasing E₁ further whilst the field of machine 2 is weakened thus decreasing E2 further. A final stage is reached when machine 1 supplies not only the whole load but also supplies power to machine 2 which starts running as a motor. Obviously, the two machines will form a short-circuited loop and the current will rise indefinitely. This condition can be prevented by using equalizing bar because of which two similar machines pass approximately equal currents to the load, the slight difference between the two currents being confined to the loop made by the armatures and the equalizer bar.