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8/14/2019 Mmh Presentation
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8/14/2019 Mmh Presentation
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Meteringis an essential part ofthe settlement system.
Quantities metered
Active Power, P
Reactive Power, QFrequency, fVoltage, V
Power factor, cos
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Section 28 (3) of the ElectricityAct 2003
The Regional Load Despatch Centre shall
a) be responsible for optimumscheduling and despatch of
electricity within the region inaccordance with the contractsentered into with the licensees orthe generating companies
operating in the region.
b) ..
c) keep accounts of quantity of electricity transmitted through
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Section 32 (2) of the ElectricityAct 2003
The State Load Despatch Centre shall
a) be responsible for optimumscheduling and despatch of
electricity within a State inaccordance with the contractsentered into with the licensees orthe generating companies
operating in that State.b) ..
c) keep accounts of quantity of electricity transmitted through
the State grid.
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RLDCs and SLDCs will have a keyrole in the metering and settlementsystem
RLDCs at the regional level SLDCs at the State level
Objective of the settlement system is todetermine
Who bills whom for how much quantum ofpower and how much money?
Settlement System-Approach
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1) Power trading has to be notional:
buyer to pay the agreed amountto the supplier for scheduled
quantum of power.
2) Payment for variations fromthe schedule through a
common mechanism, e.g. U.I.
TO AVOID DISPUTES
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TRADER
UI POOL A/C
UI for
2 MW
A B
Rs. 2.00/ u
for 10 MW
Rs. 2.20/ ufor 10 MW
PAYMENTS
UI for
2 MW
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SCHEDULING,
METERING,
UISETTLEMENT
AGREEMENT& PAYMENTFORSCHEDULED
QUANTUM
WRLDC
SRLDC
APTRANSCO/APLDC
TATAPOWER
DISCOM-A
MSEB /MSLDC
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Active energy accounting for Embeddedcustomers:
1) SLDC to forward its own drawal schedule
and the drawal/injection schedule of theembedded customers separately to RLDCon day ahead basis.
2) Composite UI bill to the State(SEB/TRANSCO) as is being done now.
Further apportioning/recovery of UIcharges from the various Discoms and
embedded customers in the State -
ENERGY ACCOUNTING
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EVALUATION OF STATE DRAWAL
USING SPECIAL ENERGY METERS
STATE ADRAWAL =
Note :
HV SIDE OF 400/220 kV ICTs exclusivelyfeeding state a
+
Inter state lines operating in integrated modemetered at state A end
+
Lines from ISGS/CTU/BBMB (220 kV & above)stations to state a metered at state a end
+
HV side of 220/132 kV, 220/66 kV and 220/33 kVICTs in case of BBMB & PDD, J&K substationsexclusively feeding state A
+ Radial inter state infeeds to state A metered at
sending end
BBMB network treated similar as CTU network
i.e.ISTS
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Standby metering points havebeen selected taking into account
Accuracy and reliability ofmetering system
Minimisation of data collection
efforts arising out of an increasein number of locations
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0.2 S accuracy class for activepower as per IEC-687, 1992
Static, totally tamper proof
Two standard models-1A and 5A
Non-volatile memory for ten days
Special Energy Meters(SEMs) specifications
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Special Energy Meters(SEMs) specifications
Harmonics filtered out andonly
the fundamental energyrecorded.
Recording in secondaryquantities. CT/CVT ratios tobe applied at control centre.
Net energy (Wh) exchange in
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Cumulative Wh transmittal ateach mid-night.
Average frequency in each 15-minute time block stores as a
two- digit code.
Cumulative reactive energyregister for voltage below 97%
Special Energy Meters(SEMs) specifications
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Special Energy Meters(SEMs) specifications
Cumulative reactive energyregister for voltage above103%
High accuracy of internal clock(one minute per month or
better) with restrictedadvance/retard facility.
VT supply disturbance time*
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No separate auxiliary supply- onlyoptical coupler for data collection.
Calibration once in five years at atest lab (0.05 accuracy class testequipment or better)
On-site accuracy check once ayear using portable 0.2S testequipment
Special Energy Meters(SEMs) specifications
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