SLDC Control Room Case Study
Situation due to Giri & Barotiwala-II restrictions and Rishikesh-Khodri outages
From Power Controller Desk
On 07.01.2010 at 13:20 hrs, 220kV Khodri-Majri line tripped from Khodri end due to outage of 220kV Khodri-Rishikesh line. However, line was charged up to Giri end from Saharanpur side but no drawl of power was allowed on this line by SLDC Rishikesh. I confirmed the matter from DGM (System Operations) Uttrakhand and it was given to understand that one of the phases of 220kV Rishikesh-Khodri line is not available and they are not able to spot the fault. It was also given to understand that the people are on the job and it is expected that fault may be cleared by 19:00 hours.
Before the outrage of this line Giri Local (17 MW) and 132kV Kala-Amb (90 MW) was being fed from Khodri and Paonta was being fed from Jalandhar-Hamirpur supply. Knowing that no power supply shall be available from Khodri, drawl to the tune of 20 MW was requested from Uttrakhand on 132kV Giri Kulhal line to feed Local Giri Area. Now the Kala-Amb area remained without power supply and there was no alternate to feed Kala-Amb full load either from Jalandhar-Hamirpur power supply or from Bhaba-Panchkula supply from Hamirpur because of the system constraints. The 220kV ICTs both at Kunihar and Jalandhar are load to their full capacity.
Power supply to local Giri was fed at 13:55 hrs from Kulhal Supply and after imposing restrictions to Kala Amb 35 to 40 MW power was fed from Solan side (Jalandhar supply). At 17:05 hrs, Kala-Amb was allowed to draw 55-60 MW. At about 17:00 hours, I again took up the matter with DGM, Uttrakhand who confirmed that they are unable to spot the fault and the line shall be patrolled on 8.1.2010 gain, but it is expected that line shall come by 17:00 hours of 8.1.2010. In view of this Control Room was instructed to convey the message of restrictions on Kala-Amb (40 MW), Paonta (20 MW) and Barotiwala (30 MW) since we were having no option left.
However this under arrangement also the transformers at Hamirpur were getting overloaded and at 20.02 hours when suddenly the Malan HEP stopped the entire system collapsed and Larji HEP also got desynchronized and thereafter supply to Giri Area could be restored at 20.45 hours.
The system till report, was working as per above arrangement.
At 6.50 Hours ICT at Kunihar tripped due to O/C and E/F whereas the loading of these transformers were 87 MW each. It has invariably been observed that these transformers which are very old behave erratically at times due to increase in temperature.
Current Situation:
System is running under very critical and precarious situation. The maximum demand has touched 1105 MW on dated 7.1.2010 and our system is grossly inadequate to handle demand beyond this. Moreover our dependency on the power infrastructure of other states like Haryana and Uttarakhand for catering to about 400 to 550 MW of power of the State has put us in a pathetically miserable and helpless situation since any snag in these system lead to severe scarcity of power and to forced restrictions on Industries.
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