230kV Voltage Dip 27-07-2014 09:25 AM

Just awhile ago, if you are one of the facilities’ guys, you probably had to scramble around because of dip alarms, standby generator cutting in or chiller drop-off.

Another 230kV fault was registered; affecting the South side of Singapore the most, suggesting a 230kV fault in the South block.

Here is a voltage waveform from one of our sites in the South.

Voltage waveform is taken at Low Voltage (L-N). It will mirror what is seen at 22kV and above (L-L).
(i.e L1 phase at LV is equivalent to L1L2 at 22kV).

The waveform here shows that there was a single phase fault (L2) at 230kV.

230kv dip 27-07-2014 0925hrs

Here it was registered; worst case dip of more than 50%. Other blocks in Singapore (North, West, East) would also have seen this fault, albeit at less severe values.

On a happier note, Selamat Hari Raya Aidilfitri (in advance) to my fellow Muslims. Maaf Zahir Batin.