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State of Rajasthan - Section

Section 5 in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004

5. System Availability.

- Licencee shall ensure weighted annual average system availability not less than the percentage given below:
Preliminary Stage-Level 1 95%
Transition Stage-Level 2 97%
Final Stage-Level 3 98%
During level 1 and level 2 stage, the licencee shall maintain annual availability level of 98% of their transmission system including sub-station bay at interconnection points with EHV, 33 KV & 11 KV transmission system from generating station during peak generation period not exceeding 4 months in a year and shall ensure puicker restoration of such transmission system during that period.
(1)System availability of a sub-station feeding power to a Distribution Licensee is to be determined according to the following formula:% System Availability of nth sub-station = (al + a2 + a3 +... + an)/N where al, a2, a3, ... an is the % availability in 1, 2, 3, . . .n th hour.N is the number of hours in the period, which for one year shall be equal to 8760.If a sub-station is Off due to State Load Despatch Centre (SLDC) emergency instructions or the supply to Distribution Licencee is kept Off for not adhering to the Connection Condition or Distribution Licencee System is faulty then such period shall not be considered as non-available for system availability computations. If licencee on account of any transmission system constraint unable to meet, the demand and kW or energy drawal is restricted then the sub-station availability for that hour shall be equal to 100-percentage specified restriction. It is clarified that the constraint of transformer capacity limitation of CT ratio or bus bar or other bay constraints shall be applicable for HV lines at the point of interconnection with RVPN's system.
(2)System availability to Distribution Licencee as a whole shall be weighted average of system availability of any sub-stations supplying power to that Distribution Licencee. The weightage of a sub-station being the sum of the capacity in MVA of EHV Transformers installed at that sub-station during that period.
(3)Weighted Average Availability of Distribution Licencee = (SASl x Cl + SAS2 x C2 + ... +, SASn x Cn) / (Cl + C2 + ... +Cn).Where SASn is the system availability of nth sub-station and Cn is the sum of the capacity of EHV transformers of nth sub-station.