Handbook of Electrical Engineering: For Practitioners in the Oil, Gas and Petrochemical Industry by Alan L. Sheldrake

Author:Alan L. Sheldrake
Language: eng
Format: epub, pdf
Publisher: John Wiley & Sons Ltd

The star and delta configurations use reactors that have lower reactances than the simple method of Figure 11.11. This will give rise to better stability in both the steady state and the transient state. In addition the AVR set-point circuits should not need to be modified.

11.9.1 Worked Example

Consider the systems shown in Figures 11.11 to 11.13. Assume that all the generators are rated at 20 MVA, with sub-transient reactances of 0.15 pu and the main switchboard operates at 11 kV. The symmetrical making current duty of the switchboard is 30,000 amps. Ignore motor contribution in this example. Calculate the per-unit reactance Xr required for each reactor in the three different systems.

a) Case A: Simple system

The 1 pu current of each generator is,

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