Question 2

1. For high voltage transmission line system in Peninsular Malaysia, in January 2017 the recorded SARFI0.9 is 0.39 and in May 2017 SARFI0.9 is 0.49. Total Power Quality Recorder used to calculate to calculate these SARFI is 158 units. From these data, what can be concluded? Discuss possible factors that cause the changes in the data and possible methods to improve further SARFI for this system.

(4 marks)

2. Given below is recorded data for voltage sag for year 2019 for a 50 Hz high voltage transmission line.

Based on this data, calculate SARFI0.9 and what can be concluded?

(2 marks)

Jadual 1 / Table 1 Minimum Voltage (%) Event Duration Time Stamp date time 7/1/19 9:48 7/2/19 9:50 7/7/19 14:20 21/7/19 15:55 7/10/19 14:26 2/8/19 7:35 2/9/19 8:30 8/9/19 10:30 73 73 25 13 20 49 10 59 9 cycle 9 cycle 82 cycle 100 cycle 2.6 cycle 1.2 minute 2 minute 20 cycle Jadual 1 / Table 1 Minimum Voltage (%) Event Duration Time Stamp date time 7/1/19 9:48 7/2/19 9:50 7/7/19 14:20 21/7/19 15:55 7/10/19 14:26 2/8/19 7:35 2/9/19 8:30 8/9/19 10:30 73 73 25 13 20 49 10 59 9 cycle 9 cycle 82 cycle 100 cycle 2.6 cycle 1.2 minute 2 minute 20 cycle