tariff in incentive is calculated as per cerc order 26.09.2000 methodology all elements are grouped...

Tariff in Incentive is calculated as per CERC order 26.09.2000 Methodology

All elements are grouped into following catagories

1. AC Transmission lines = AVo2. ICTs = AVq3. Switched Bus Reactors = AVs4. HVDC lines =AVp5. HVDC back to back =AVt6. SVC =AVr

Availability of each category is calculated based on the Weightage Factor ,Total hours under consideration and non available hours for each element of that category.

° °Availability of o No of AC lines = Σ Wi(Ti-Tnai)/ Σ Wi = AVo

i=1 i=1

Where Wi = Weightage factor for ith transmission line Ti = Total hours of ith AC line Tnai= Total non availability hours for ith AC line

Wi = Surge Impedance loading * Circuit Kms For inter regional lines , 50% of the weighted factor is taken for each region. For HVDC pole – The Rated MW capacity * circuit km

For ICT - The rated MVA capacity For switched bus reactor – The rated MVAR capacity For HVDC back to Back connecting two regions – 50 % of the Rated MW capacity of each block to each region.

Overall Availability of Region

% System Availability :

o*AVo + p*AVp+q*AVq+r*AVr+s*AVs+t*AVt-------------------------------------------------------------- * 100 o + p+q+r+s+t

FACTORS INFLUENCE THE SYSTEM AVAILABILITY

1. Planning of AMP works and opportunity Shut downs2. Exceeding the given Shut down period 3. Thermovision scanning of Lines and other Eqpt4. Effective patrolling and proper reporting5. Cleaning of Insulators in polluted areas6. Patrolling in critical locations7. Proper communication during shut down period8. Proper planning of Manpower and T& P9. On line testing of Relays10. Clearing of Tree and bushes in proper time 11. Replacing defective/puncture insulators by Hot Line techniques.12. Signature analysis of Transmission Lines

Important :

Outage of element causing Generation loss shall deemed to be twice the actual outage period for that element.

Mis-declaration / submission of incorrect data shall be treated as twice the actual outage time.

HVDC back to back and AC lines are considered asOne element

Outage of elements due to earth quake, cyclone,Grid disturbance ,Act of god such as floods are considered as Natural calamities.

Lines restored on ERS is considered as deemed available

The Availability of Transmission system is calculated in (%) Percentage as follows: (2001-2002 of SRTS-I)

Ta =Total available time in hours for all Lines = 17*24*365 =148920

To=Total outage time in hours Attributable to POWERGRID for all Lines = 395.39 Hours

Availability in percentage (%) = ((Ta-To)/Ta*100

Availability in percentage (%) = (148920-395.39)/148920*100

= 99.74 %

Availability as per CERC order 26.09.2000 Methodology

B = Annual Time =1*24*365 = 8760 C= Outage hours ATR to others = 00.00D= Outage hours ATR to Sys-Const = 20.81E = Total hours to be considered for Availability

Ti =((B-(C+D)) = ((8760-(0.0+20.81)) = 8739.19

F = Outage ATR to POWERGRID (TNA) = 14.40

G = Deemed available ( 4.93)

% Line Availability H = ( Ti –TNA)/Ti)

% Line Availability = (8739.19-14.40)/8739.19

= 0.9984ATR = Attributable

Weightage Factor

I = Line length in Ckt Kms = 187.291

J = Surge Impedance Loading = 515 (400kV Moose ACSR)

Wi = Weightage Factor = Line length * SIL = 96454.87

Avo = (Wi* % Line Availability)/Wi

= (96454.87*0.9984)/96454.87

= 0.9984



TK =((B-(C+D)) = ((8760-(20.38+13.70)) = 8725.92

F = Outage ATR to POWERGRID (TNAK)= 23.18

G = Deemed available (0.0)

% ICT Availability H = ( TK –TNAK)/TK)

% ICT Availability = (8725.92-23.18)/8725.92 = 0.9973

Weightage factor (Wk) = Rated MVA capacity

Avq = (Weightage factor * % ICT Availability )/ Wk

= 315*.9973/315

= 0.9973



Tm =((B-(C+D)) = ((8760-(0.0+0.0) = 8760

F = Outage ATR to POWERGRID (Tnam)= 97.50


% Bus Reactor Availability H = ( Tm –Tnam/Tm)

% Bus Reactor Availability = (8760-97.50)/8760 = 0.989

Weightage factor (Wm) = Rated MVAR capacity

Avs = (Weightage factor * % Bus Reactor Availability )/ Wm

= (50*0.989)/50

= 0.989


B = Annual Time =1*24*365 = 8760 C= Outage hours ATR to others =5.28D= Outage hours ATR to Sys-Const = 9.77E = Total hours to be considered for Availability

Tn =((B-(C+D)) = ((8760-(5.28+9.77) = 8744.95

F = Outage ATR to POWERGRID (Tnan)= 88.93


% HVDC POLE Availability H = ( Tn –Tnan/Tn)

% HVDC POLE Availability = (8744.95-88.93)/8744.95 = 0.9898

Weightage factor (Wn) = 50 % of Rated MW capacity

Avt = (Weightage factor * % POLE Availability )/ Wn

= (250*0.9898)/250

= 0.9898

= 50% of 500 MW = 250

Tariff in Incentive is calculated as per CERC order 26.09.2000 Methodology

All elements are grouped into following catagories

1. AC Transmission lines = AVo2. ICTs = AVq3. Switched Bus Reactors = AVs4. HVDC lines =AVp5. HVDC back to back =AVt6. SVC =AVr

Availability of each category is calculated based on the Weightage Factor ,Total hours under consideration and non available hours for each element of that category.

° °Availability of o No of AC lines = Σ Wi(Ti-Tnai)/ Σ Wi = AVo

i=1 i=1

Where Wi = Weightage factor for ith transmission line Ti = Total hours of ith AC line Tnai= Total non availability hours for ith AC line

Wi = Surge Impedance loading * Circuit Kms For inter regional lines , 50% of the weighted factor is taken for each region. For HVDC pole – The Rated MW capacity * circuit km

For ICT - The rated MVA capacity For switched bus reactor – The rated MVAR capacity For HVDC back to Back connecting two regions – 50 % of the Rated MW capacity of each block to each region.

Overall Availability of Region

% System Availability :

o*AVo + p*AVp+q*AVq+r*AVr+s*AVs+t*AVt-------------------------------------------------------------- * 100 o + p+q+r+s+t

THANK YOU

tariff in incentive is calculated as per cerc order 26.09.2000 methodology all elements are grouped...

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