For parallel operation of alternator what should be the resistance value in comparison with reactance? Please provide explanation.?

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Answer

Resistance and Reactance in Parallel Operation of Alternators

When operating alternators in parallel, it is crucial to ensure that the resistance and reactance values are properly balanced. The resistance and reactance affect the flow of current and power distribution between the alternators.

The Importance of Parallel Operation

Parallel operation of alternators is commonly employed to achieve several objectives:

Increase overall power output

Enhance reliability by providing redundancy

Facilitate maintenance and repair without interrupting power supply

Improve efficiency by operating generators at their optimal load

Resistance in Parallel Operation

The resistance value in parallel operation plays a crucial role in ensuring equal sharing of the load between the alternators. Ideally, the resistance value in parallel operation should be equal to or very close to zero. This helps to achieve equal sharing of current and load.

However, in practice, it is difficult to achieve zero resistance due to factors such as internal resistance of the alternators, connecting cables, and other components. Therefore, a small resistance value is acceptable but should be minimized to avoid unequal current sharing.

Reactance in Parallel Operation

The reactance value in parallel operation determines the distribution of reactive power between the alternators. Reactive power is required for magnetizing the alternator windings and maintaining the voltage regulation.

For efficient parallel operation, the reactance values of the alternators should be equal or very close. This ensures that the reactive power is shared equally between the alternators, preventing voltage instability or fluctuations.

Impedance Matching

For proper parallel operation, both the resistance and reactance values need to be matched as closely as possible. This can be achieved by:

Using alternators with similar impedance characteristics

Applying appropriate adjustments or modifications to the alternators

Using reactive components such as reactors or capacitors to compensate for any mismatches

Conclusion

In parallel operation of alternators, it is important to ensure that the resistance and reactance values are properly balanced. The resistance should be minimized to achieve equal current sharing, while the reactance should be matched to distribute the reactive power equally. Proper impedance matching is crucial for efficient and reliable parallel operation of alternators.

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