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State of Rajasthan - Section

Section 8 in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004

8. Reliability.

- System reliability includes three aspects:-
(1)System Adequacy. - System adequacy is the ability of the electric system to receive the generated power or supply the aggregate electrical demand and energy requirements of their consumers at all times, taking into account scheduled and reasonably expected, unscheduled outage of system elements.Adequacy of the power system is usually measured in terms of loss of Load Probability (LOLP). LOLP is the Probability of system capacity not being able to meet system load. LOLP can also be expressed as loss of load expectation (LOLE) in days per year. This measure does not consider the amount or duration of the capacity shortfall. Licencee to consider LOLE days in percentage as under:-
Implementation Stage Nos. of days in year when system demand can befully met subject to generation availability Nos. of days in year when system demand cannot be fully met even with generation availability Loss of load expectation (LOLE) in % of days
Preliminary Stage-Level-1 325 40 11%
Transition Stage-Level-2 345 20 6%
Final Stage-Level-3 358 7 2%
LOLE for different voltage level shall be reviewed after first annual review.
(2)System Security. - Security is the ability of the electric system to withstand sudden disturbance such as electric short circuits or unanticipated loss of system element. The State Transmission System shall be designed for a security level of n-I i.e. to withstand a single contingency with little negative effect. This means the most severe fault or tripping of a critical generator, transformer or line should not result in instability of the system, overloading of lines and/or transformers for more than 15 minutes, voltage drop of more than 10% when the system import is increased by 20%. Licencee shall maintain the system security level of "n- 1" (single contingency) plus spinning reserve margin for Steady State Operation.
(3)Service Reliability. - The points where electric power is supplied from transmission system to the Users (Distribution Licencees, another transmission system, EHV consumers) are called delivery point or grid supply points. Outage at these points, directly affects the Users of the Grid. The reliability level at the delivery points is therefore an indication of quality of service provided by Licencee to its Users.System reliability of the Grid is expressed in terms of• (System Average Interruption Frequency Index (SAIEI)• (System Average Interruption Duration Index (SAIDI)
(4)System Average Interruption Frequency Index (SAIFI). - This index gives number of interruptions in power supply to loads expressed as per year per EHV GSS for a voltage class. All interruptions of duration exceeding 5 (five) minute at a time shall be counted in computing this index. Interruptions due to acts of nature, orders of civil/military authorities, scheduled, outage (including three shift operation of agriculture pump sets), load shedding to meet capacity shortage, failure of PGCIL andBBMB's transmission system or failure of generating units (leading to grid failure or system islanding) are to be excluded.SAIFI = ∑1/N :Where∑1 = Sum number of interruptions exceeding 5 minutes at a time duration in the year for the voltage class.N=Number of EHV sub-stations in service at the beginning of year having that class of voltage supply.
(5)System Average Interruption Duration Index (SA1DI). - This index gives weighted average interruptions in a year with reference to the total connected load on the system. All interrupted loads for duration exceeding 5(five) minutes at a time in the year are to be counted in computing the index Interruptions due to acts of nature, orders of civil/military authorities, scheduled outage (including three shift operation of agriculture pump sets), load shedding to meet capacity shortage, failure of PGCIL and EEMB's transmission system or failure of generating units (leading to grid failure or system islanding) are to be excluded in the computation of this index. SAIDI gives the measure of average interruption time per EHV/GSS on annual basis for voltage class.SAIDI = ∑D/N :Where∑D = Sum of duration all interruptions of exceeding 5 minutes at a time in the year for the voltage class.N = Number of EHV sub-stations in service at the beginning of year having that class of voltage supply.
Implementation Stage SAIFI SAIDI
Preliminary Stage-Level-1 No limit No limit
Transition Stage-Level-2 24 per year 10 hrs/year
Final Stage-Level-3 18 per year 8 hrs/year