ANNEXURE-B

DEFINITIONS

B-1 Steam Power Station

B-1.1 ‘Auxiliary Energy Consumption’ - In relation to any period, the ratio, expressed as a percentage, of

(a) gross energy in kwh generated at Generator terminals minus net energy in kwh delivered at the Generating Station Switchyard

to

(b) gross energy in kwh generated at the Generator terminals.

B-1.2 ‘Available Capacity’ - In relation to Settlement Period, the sum of

(a) Power delivered or deemed to be delivered (in case of backing down) at the switchyard

and

(b) Auxiliary power consumption,

Explanation (1) : Auxiliary power consumption shall be the average value based on Auxiliary Energy Consumption at the PLF or deemed PLF during the Settlement period.

Explanation (2) : The available capacity shall not exceed the Installed Capacity

B-1.3 Commercial Operation Date’ or ‘COD’ - In relation to a Unit, date by which the Maximum Continuous Rating (MCR) or acceptable installed capacity is demonstrated by a Performance Acceptance Test as per international codes, after successful trial operation including stabilisation. The COD of the Generating  Station shall be reckoned from the COD of the last Unit.

B-1.4 ‘Deemed Plant Load Factor’ – In relation to any period of operation of the Generating Station, the ratio, expressed as a percentage, of

a) The sum of Available Capacity for each Settlement Period

to

b) Installed Capacity multiplied by the number of Settlement Periods

B-1.5 Demonstrated Capacity’ – In relation to a Unit, the electric output at Generator terminals demonstrated at rated parameters during Performance Acceptance Test as per international codes such as ASME PCT 6, after successful trial operation including stabilisation.

Explanation: The Demonstrated Capacity shall be corrected for 47.5 Hz grid frequency and worst circulating water inlet temperature for the purpose of arriving at the Installed Capacity.

B-1.6 ‘Generating Station’ - Unit and balance of plant

B-1.7 ‘Gross calorific Value’ or ‘GCV’ - The heat produced in kCal by complete combustion of one kg. of solid fuel or liquid fuel or one standard cubic metre (Sm3)   of gaseous fuel, as per IS: 1350 (Part-II) or IS:1448 (P : 6) as the case may be.

Explanation : In case of coal or lignite fuel, the GCV of the fuel as received shall be reduced by 100 kCal/kg to arrive at the GCV of the fuel as fired for the purpose of determination of the fuel consumption

B-1.8 Gross Heat Rate’ or ‘GHR’ - The heat energy in kCal input to Turbine – Generator cycle to generate one kwh of electric energy at Generator terminals.

B-1.9 ‘ Installed Capacity’ - In relation to a Generating Station, Rated Capacity or sum of the Demonstrated Capacity of the Units in the Generating Station, whichever is less.

Explanation : Installed Capacity shall be maintained down to 47.5 Hertz (Hz) grid frequency, with worst circulating water inlet temperature and with worst fuel.

B-1.10 ‘Maximum Continuous Rating’ or ‘MCR’- In relation to a Unit, the maximum Continuous output at the Generator terminals, guaranteed by the manufacturers at rated parameters as per IEC-45

Explanation : MCR shall be maintained down to 47.5 Hertz (Hz) grid frequency, with worst circulating water inlet temperature and with worst fuel.

B-1.11 ‘Net calorific Value’ or NCV – Gross Calorific Value minus the heat loss due to total moisture in complete combustion of one kilogram of solid fuel or liquid fuel or one standard cubic metre of gaseous fuel, expressed in kCal/kg or Sm3

B-1.12 ‘ Net Heat Rate’ or ‘NHR’ – The heat energy in kCal, input to a Generating Station to deliver one Kwh at the switchyard .

B-1.12.1 ‘ Net Heat Rate Formulations’

The daily Net Heat Rate at any loading of the Generating Station shall be
(a) guaranteed Net Heat Rate corresponding to the loading of the Generating Station multiplied by 1.05
or
(b) the value determined by the following formulae, whichever is less

DNHR =         GHR X 100                  100
              -------------------- X ----------
                  100-AEC                    SGE

Where, DNHR is the Net Heat Rate of the Generating Station during a day in Kcal/Kwh,

GHR is the Gross Heat Rate of the Turbine Generator Cycle in kCal/kWh corresponding to the loading of the Turbine-Generator during the relevant day, as per para 1.1.4.1 of Operation Norms

SGE is the Steam Generator Efficiency expressed in percentage , as per para 1.1.4.1.1 of Operation Norms.

AEC is the Auxiliary Energy Consumption, corresponding to the loading of the Turbine Generator during the relevant day, expressed in percentage, as per para 1.1.4.1 of Operation Norms.

The monthly average Net Heat Rate shall be calculated by weighted average as per the following formula :

MNHR =           Sum of (DNHR x NkWh) during the month
                --------------------------------------------
                       Sum of NkWh during the month

Where, MNHR is the monthly average Net Heat Rate in kCal/kWh,

DNHR is the Net Heat Rate for a day in kCal/kWh

NkWh is the net kWh delivered at the switchyard during the relevant day

Note (1) : The guaranteed Net Heat Rate shall be at design cooling water inlet temperature corresponding to 90% duration and adjustment for ash, moisture and hydrogen content of primary fuel, except for Corex gas.

Note (2) : In case the guaranteed Net Heat Rate is not available , the Net heat Rate shall be determined based on guaranteed Gross Heat Rate of Steam Turbine - Generator Cycle at design cooling water inlet temperature corresponding to 90% duration, guaranteed Steam Generator Efficiency with adjustment for ash, moisture and hydrogen content except for Corex gas and Auxiliary Energy consumption and degradation multiplying factor of 1.05.

B-1.13 'Operation and Maintenance Expenses' or 'O&M Expenses' - In relation to a period, the expenditure incurred in operation and maintenance of the generating station including manpower, spares, consumables (including water), insurance and overheads.

B-1.14 'Plant Life' - As per Government of India Gazette Notification No. 265 (E) dated 29th March, 1994, as amended from time to time.

B-1.15 'Plant Load Factor' or 'PLF' - In relation to any period, the ratio, expressed as a percentage, of

a) total kWh generated at Generator terminals

to

b) Installed Capacity, expressed in kilowatts (kW) multiplied by number of hours in the relevant period,

B-1.16 'Rated Capacity' - In relation to the Generating Station, the Maximum Continuous Rating (MCR) of a Unit multiplied by number of Units in the Generating Station.

B-1.17 'Settlement Period' - An hour or any other agreed period during which the  Available Capacity shall be taken as constant and equal to the average capacity during the period.

B-1.18 'Steam Generator Efficiency' - The ratio, expressed as a percentage, of

a) Gross Calorific Value (GCV) of the fuel fired minus the heat losses in the Steam Generator per unit quantity of fuel, as per international codes, but without heat credit.

to

b) Gross Calorific Value of the fuel fired.

B-1.19 'Unit' - Steam Generator - Turbine - Generator and their auxiliaries.

B-2 Combined Cycle Combustion Turbine (CCCT) Generating Station

B-2.1 ‘Auxiliary Energy Consumption’ – In relation to any period, the ratio, expressed as a percentage, of

(a) gross energy in kWh generated at Generator(s) terminals minus net energy in kWh delivered at the switchyard

to

(b) gross energy in kWh generated at the Generator(s) terminals,

B-2.2 Calorific Value:

B-2.2.1 ‘Gross Calorific Value’ or ‘GCV’ – the heat produced in kCal by complete combustion of one kilogram (Kg) of liquid fuel expressed in ‘kCal/kg’ as per latest version of IS: 1448 (P: 6) or one standard cubic metre of gaseous fuel expressed in ‘kCal/Sm3’ as per latest version of ASTM D 3588.

B-2.2.2 ‘Net Calorific Value’ or ‘NCV’ – Gross Calorific value minus the heat losses due to moisture in complete combustion of one kilogram of liquid fuel, expressed in ‘kCal/kg’, as per latest version of IS: 1448 (P : 6) or one standard cubic metre of gaseous fuel expressed in ‘kCal/Sm3’ as per latest version of ASTM D 3588.

B-2.3 Capacity:

B-2.3.1 ‘Maximum Continuous Rating’ or ‘MCR’ – In relation to a Unit or Block, the maximum continuous output at the Generator(s) terminals, guaranteed by the manufacturer with Water/steam injection (if applicable) at ISO-2314 and ISO 3977 reference conditions and corrected to 50 Hz grid frequency and site conditions.

Explanation : Site conditions refer to annual mean dry bulb temperature, annual mean relative humidity, site atmospheric pressure and worst circulating water inlet temperature.

B-2.3.2 ‘Rated Capacity’ – In relation to the Generating Station, the Maximum Continuous Rating (MCR) of Block multiplied by the number of Blocks in the Generating Station.

B-2.3.3 ‘Demonstrated Capacity’ – In relation to a Unit or Block, the electric output at Generator(s) terminals demonstrated during Performance Acceptance Test as per latest versions of ISO-2314/ASME PTC- 22 for Combustion Turbine and ASME PTC 6 for Steam Turbine after successful trail operation and corrected to 50 z grid frequency and site conditions as at B-2.3.1 above.

B-2.3.4 ‘Installed Capacity’ – In relation to the Generating station,

For the first year of plant operation reckoned from COD of the Generating Station :

Rated capacity or sum of the Demonstrated capacities of the Blocks in the Generating Station whichever is less.

For subsequent years of plant operation :

Installed Capacity of Generating station in any year is to be determined by multiplying the first year Installed Capacity by Capacity Degradation Factor for the corresponding year as given in Operation Norms

 

B-2.3.5 ‘Available capacity’ – In relation to any settlement period, the sum of

a) Power delivered or deemed to have been delivered (in case of backing down) at switchyard

and

b) Auxiliary Power Consumption and corrected to average dry bulb temperature of the Settlement Period.

Explanation:

1.

Auxiliary Energy Consumption as per operation norms shall be taken as Auxiliary Power Consumption for this purpose.

2.

Available capacity, when corrected to site conditions as at B-2.3.1 above, shall not exceed the Installed Capacity.

B-2.4 ‘Commercial Operation Date’ or ‘COD’ – In relation to a Unit or Block, date by which the Maximum Continuous Rating (MCR) or acceptable installed capacity is demonstrated by Performance Acceptance Test as per latest versions of ISO-2314/ASME PTC-22 for Combustion Turbine and ASME PTC-6 for Steam Turbine after successful trial operation including stabilisation. The COD of the Generating Station shall be reckoned from the COD of the last Block.

B-2.5 Heat Rate:

B-2.5.1 ‘Gross Heat Rate’ or ‘GHR’ – The heat energy in kCal input to the Unit or Block or Generating station to generate one kWh of electric energy from the Unit or Block or Generating station at Generator’s terminals.

B-2.5.2 ‘Net Heat Rate’ or ‘NHR’ - The heat energy in kCal. input to the Unit or Block Generating Station to deliver one kWh of electric energy at the switchyard.

Explanation: The gross Heat Rate and a Net Heat Rate shall be based on NCV of fuel.

B-2.5.2.1 Net Heat Rate Formulations

A) The Net Heat Rate for a Settlement Period at any loading of the CCCT Generating Station shall be a) guaranteed Net Heat Rate at site ambient conditions corresponding to loading of the Generating Station multiplied by 1.035 or b) the value determined by the following formula, whichever is less:

                                  100
SNHR = GHR  X  ---------------
                               100-AEC

Where, SNHR is the Net Heat Rate of the Generating Station, in kCal/Kwh, during a Settlement Period in combined cycle mode.

GHR is the Gross Heat Rate of the CCCT Generating Station in kCal/kWh corresponding to the loading of the Generating Station during the relevant Settlement Period as per para 1.1.4.2.1 of Operating Norms and corrected to site ambient conditions as per manufacturer’s correction factors to take into account the deviations from standard reference conditions of ISO-2314 and ISO-3977.

AEC is the Auxiliary Energy Consumption of the Generating station in combined cycle mode expressed in percentage.

The monthly average Net Heat Rate shall be calculated by weighted average as per the following formula:

               Sum of (SNHR x NkWh) during the month
MNHR =    -----------------------------------------
                    Sum of NkWh during the month

Where, MNHR is the monthly average Net Heat Rate in kCal/kWh,

SNHR is the Net Heat Rate for a Settlement Period in kCal/kWh.

NkWh is the net electric energy in kWh delivered at the switchyard during the relevant Settlement Period.

B) For Unit(s) operating in simple cycle mode, the Net Heat Rate for a Settlement Period at any loading shall be a) guaranteed Net Heat Rate at site ambient conditions corresponding to loading of the Unit multiplied by 1.0325 or b) the value determined by the following formula, whichever is less:

                                          100
SNHR (SC) = GHR (SC) X --------------------
                                      100-AEC (SC)

Where, SNHR (SC) is the Net Heat Rate of the Unit in kCal/kWh during a Settlement Period in simple cycle mode.

GHR (SC) is the Gross Heat Rate of the Unit in kCal/kWh corresponding to its average loading during the relevant Settlement Period as per para 1.1.4.2.2 of Operating Norms for simple cycle mode of operation and corrected to site ambient conditions as per manufacturer’s correction factors to take into account the deviations from standard reference conditions of ISO-2314.

AEC (SC) is the Auxiliary Energy Consumption of the Unit in simple cycle mode expressed in percentage

Note: 1. Site ambient conditions, for the purpose of determining Gross Heat
Rate to account for deviations from ISO conditions, refer to annual mean dry bulb temperature, annual mean relative humidity, site atmospheric pressure and condenser vacuum based on cooling water inlet temperature corresponding to 90% duration.

2. Where a combination of fuels (e.g. Natural Gas and Naphtha) is used, the respective net heat rate for a Settlement Period shall be calculated separately for each fuel.

B-2.6 ‘Operation and Maintenance Expenses’ or ‘O&M Expenses

In relation to a period, the expenditure incurred in operation and maintenance of the Generating Station including expenses towards manpower, spares, consumables (including water), insurance and overheads.

B-2.7 ‘Plant Life’ – As per Govt. of India Gazette Notification No.265 (E) dated 29th March 1994, as amended from time to time.

B-2.8 Plant Load Factor:

B-2.8.1 ‘Plant Load Factor’ or ‘PLF’ – In relation to any period, the ratio expressed as a percentage of

(a) The sum of total kWh delivered at the switchyard and Auxiliary Energy consumption as per operation norms

to

(b) Installed Capacity, expressed in KiloWatts (kW) multiplied by the number of hours in the relevant period.

B-2.8.2 ‘Deemed Plant Load Factor’ – In relation to any period of operation of the Generating Station, the ratio expressed as percentage of

a) The sum of Available Capacities for each Settlement Period to

b) Installed Capacity multiplied by the number of Settlement Periods

B-2.9 Plant Configuration:

B-2.9.1 ‘Unit’ – In relation to CCCT Generating Station: Combustion Turbine-Generator and auxiliaries.

B-2.9.2 ‘Block’ – In relation to CCCT Generating Station:  Combustion turbine – Generator(s), associated Waste Heat Recovery boiler(s), connected Steam Turbine – Generator and auxiliaries.

B-2.9.3 ‘Generating Station’ – In relation to CCCT Generating Station: CCCT Block(s) and balance of plant.

B-2.10 'Settlement Period' - An hour or any other mutually agreed period during which the available capacity shall be taken as constant and equal to average capacity during the period.

B-3 Diesel Generating Station

B-3.1 'Auxiliary Energy Consumption' - In relation to any period, the ratio, expressed as a percentage, of

(a) gross energy in kWh generated at Generator(s) terminals minus net energy in kWh delivered at the switchyard.

to

(b) gross energy in kWh generated at the Generator(s) terminals,

B-3.2 Calorific Value:

B-3.2.1 'Gross Calorific Value' or 'GCV' - The heat produced in KCal by complete combustion of one kilogram (Kg) of liquid fuel expressed in 'KCal/Kg' as per latest version of IS: 1448 (P:6).

B-3.2.2 'Net Calorific Value' or 'NCV' - Gross Calorific value minus the heat losses due to moisture in complete combustion of one kilogram of liquid fuel, expressed in 'Kcal /kg', as per latest version of IS:1448 (P:6).

B-3.3 Capacity:

B-3.3.1 ' Maximum Continuous Rating' or MCR' - In relation to a Unit the maximum continuous output at the Generator terminals, guaranteed by the manufacturer at ISO-3046 reference conditions and corrected to 50 Hz grid frequency and site conditions.

Explanation : Site conditions refer to annual mean dry bulb temperature, annual mean relative humidity and maximum charge air coolant temperature.

B-3.3.2 'Rated Capacity' - In relation to the Generating Station, the Maximum Continuous Rating (MCR) of unit multiplied by the number of units in the Generating Station.

B-3.3.3 'Demonstrated Capacity' - In relation to a Unit, the electric output at Generator terminals demonstrated during Performance Acceptance Test as per latest versions of ISO-3046 for Diesel Engine and IS:4722, IS:5422, IS:7132 and IEC-34 for Generator after successful trial operation and corrected to 50 Hz grid frequency and site conditions as at B-3.3.1 above.

B-3.3.4'Installed Capacity' - In relation to the Generating station, Rated capacity or sum of  the Demonstrated capacities of the units in the generating station whichever is less.

B-3.3.5 'Available capacity' - In relation to any settlement period, the sum of

a) power delivered or deemed to have been delivered (in case of backing down) at switchyard

and

b) Auxiliary power consumption

and corrected to annual mean dry bulb temperature at site and 50 Hz grid frequency.

Explanation: 1. Auxiliary Energy consumption shall be taken as Auxiliary Power consumption for this purpose.

2. Available capacity shall not exceed the Installed Capacity.

B-3.4 'Commercial Operation Date' or 'COD' - In relation to a Unit, date by which the Maximum Continuous Rating (MCR) or acceptable installed capacity is demonstrated by a Performance Acceptance Test as per latest versions of ISO-3046 for Diesel Engine and IS:4722, IS : 5422, IS:7132 and IEC-34 for Generator after successful trial operation including stabilisation. The COD of the Generating Station shall be reckoned from the COD of the last Unit.

B-3.5 'Generating Station' - In relation to Diesel Engine Generating Station : DG units and balance of plant

B-3.6 Heat Rate:

B-3.6.1 'Gross Heat Rate' or GHR' - The heat energy in kCal input to the Unit to generate one kWh of electric energy at Generator terminals.

B-3.6.2 'Net Heat Rate' or 'NHR' - The heat energy in kCal, input to the Generating Station to deliver one kWh at the switchyard.

Explanation: In relation to, Diesel Engine - Generator (DG) Unit, the Gross Heat Rate and the Net Heat Rate shall be based on NCV of fuel.

B-3.6.2.1Net Heat Rate Formulations

The daily Net Heat Rate of the Generating Station shall be determined by the following formula:

                           100
DNHR = GHR X ----------------
                        100-AEC

Where, DNHR is the Net Heat Rate of the Generating Station during a day

GHR is the Gross Heat Rate of the Diesel Generating Unit in kCal /kWh corrected to site ambient conditions to take into account the deviations from standard reference conditions of ISO-3046.

AEC is the Auxiliary Energy Consumption, expressed in percentage,

The monthly average Net Heat Rate shall be calculated by weighted average as per the following formula.

                    Sum of (DNHR X NkWh) during the month
MNHR =          -----------------------------------------
                          Sum of NkWh during the month

Where MNHR is the monthly average Net Heat Rate in kCal/kWh,

DNHR is the Net Heat Rate for a day in kCal/kWh

NkWh is the net kWh delivered at the switchyard during the relevant day

B-3.7 'Operation and Maintenance Expenses' or 'O&M Expenses' -

In relation to a period, the expenditure incurred in operation and maintenance of the generating station including manpower, spares, consumables (including water), insurance and overheads.

B-3.8 'Plant Life' - As per Govt. of India Gazette Notification No. 265 (E) dated 29th March, 1994, as amended from time to time.

B-3.9 Plant Load Factor:

B-3.9.1 'Plant Load Factor' or 'PLF' - In relation to any period, the ratio, expressed as a percentage of

(a) The sum of total kWh delivered at the switchyard and Auxiliary Energy Consumption as per operation norms

to

(b) Installed Capacity, expressed in kilo Watts (kW) multiplied by the number of hours in the relevant period,

B-3.9.2 'Deemed Plant Load Factor' - In relation to any period of operation of the Generating Station, the ratio expressed as percentage, of

(a) The sum of available capacities for each Settlement Period

to

(b) Installed capacity multiplied by the number of Settlement Periods

B-3.10 'Settlement Period' - An hour or any other mutually agreed period during which the available capacity shall be taken as constant and equal to average capacity during the period.

B-3.11 'Unit' - in relation to :

Diesel Engine Generating Station : Diesel Engine Generator and auxiliaries

B-4 In combustion and Post Combustion Flue Gas Desulphurisation System

B-4.1 Specific Reagent Consumption

Weight of reagent required in Kg per Kg of primary fuel fired in the steam generator.

B-4.2 Sulphur Dioxide Removal Efficiency

Ratio of number of moles of SO2 removed in the desulphurisation system to the number of moles of SO2 produced in the combustion process, expressed as percentage.

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