Problem 3 [15] 3-1 What action you need to take if you want to increase the shar

Question

Problem 3 [15] 3-1 What action you need to take if you want to increase the share of load (real power) of a generator which is connected to another generator in parallel at const load at bus. Explain using house diagram. 3-2 A 500 kVA, 2300V three phase Y connected synchronous generator is operated at its rated speed to obtain its rated no load voltage. When a short circuit is established the phase current is 150A. The average resistance of each phase is 0.5. a. Determine the synchronous reactance per phase b. Determine the percent voltage regulation when the generator delivers the rated load at its rated voltage and .8 pf lagging

Explanation / Answer

connecting generators in parallel increase the power capacity, and control in the load should be managed. In this process two or more generator are to be connected in parallel and the output of all the generator should be synchronized.

when two generators are connected in parallel than following points should be considered

1. synchronization should be based on the demand of load

2. An soft power transfer should be ensured so when the outgoing generator is switched off then the incoming one is power on.

3. The generator may have equal or different engine speeds but they must be locked into the final speed of the system

4. The entire load should be shared by all the generators

5. all the generatorsin parallel should be phase synchronized as output phase and frequency should be same as that of input.

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