Tata Power- DDL : Best Practices in Energy Accounting · EA Meters in Tata Power-DDL Dist. System TPDDL 11kv Bus Bar M M M M DTL 11kv Bus DTL66 kv Bus Bar Meter on CT /PT Unit Zone-2

Tata Power- DDL : Best Practices

in Energy Accounting

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About Tata Power - DDL

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AT&C Loss Trajectory Vs DERC Target

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Evaluates the efficiency of all process / systems that use energyStarts at the utility meters, locating all energy sources coming into

a facilityInvolves preparation of account of the energy flow to various

segments of Sub-transmission and Distribution system.Starts from the input level up to the end consumer level in order

to ascertain the losses at different voltage levels.Done to improve energy Efficiency

Energy Auditing and Accounting ?

If You Can't Measure It, You Can't Improve It” –Peter Drucker

Objective of Energy Audit at Tata Power - DDL

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Accurate Input Calculation

• At Exchange points with Transmission Co.

• At Zonal / Subdivision Level (Internal)

Loss calculations

• Aggregate Technical and Commercial Loss

• D&B Losses / Technical Loss/ Target Determination

Energy Services to Operations

• Transformer / Feeder Loading Details

• Peak Load / Unbalancing etc.

Ring Fencing of TPDDL Network

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•Distribution Transformers

•(Service Level-4)

• 4610 Nos. Distribution Txs

•Distribution Feeders

•(Service Level-5)

• 1000 11 KV Feeders

• 60 No 11 KV InterzonalExchange points

•Grid S/Stn

•(Service Level-2)

•70 Grid S/S

• 210 Power Txs / Incomers

•66/33/11Kv

•Exchange Points (Service Level-1)

• 95 Interface Points

•202 TPDDL Check Meters

DTL Zones

DT Losses

Feeder Losses

Import/Export points

DT

SL-2

SL-3

SL-4

SL-1

SL-5

ABT compliant

AB

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66/3

3 k

V

100 %

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ctr

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sService Levels

CEA Regulations on Metering

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1(o) ‘Main Meter’ means a meter, which would primarily be used for accounting andbilling of electricity;1(i) Check Meter’ means a meter, which shall be connected to the same core of theCurrent Transformer (CT) and Voltage Transformer (VT) to which main meter isconnected and shall be used for accounting and billing of electricity in case of failure ofmain meter;1(l) Energy Accounting and Audit Meters’ means meters used for accounting of theelectricity to various segments of electrical system so as to carry out further analysisto determine the consumption and loss of energy therein over a specified time period;1(n) ‘Interface Meter’ means a meter used for accounting and billing of electricity,connected at the point of interconnection between electrical systems of generatingcompany, licensee and consumers, directly connected to the Inter-State TransmissionSystem or Intra-State Transmission System who have to be covered under ABT andhave been permitted open access by the Appropriate Commission;1(v) ‘Standby Meter’ means a meter connected to CT and VT, other than those usedfor main meter and check meter and shall be used for accounting and billing ofelectricity in case of failure of both main meter and check meter;

EA Meters in TPDDL Sub-Transmission System

DTL

11kv Bus Bar

PTR-1

220 / 66 /33 KV

CM

M M

MM

M M

M M

M M M M

PTR-2

66 / 33 kv Bus Bar

DTL : 66/33 kv Bus Bar

99.0 MU

SL-1

M M

DTL : 11 kv Bus

DTL 66 / 11 KV PTR

100 MU

SL-2

99.5 MU

Sub TxLoss

Zone-1

EA Meters in Tata Power-DDL Dist. System

TPDDL 11kv Bus Bar

MM M M

DTL 11kv Bus

DTL66 kv Bus Bar

Meter on CT /PT Unit

Zone-2

M

LV Pole S/L LV Bus

3-Ph Hvds1-Ph Hvds

Zone-3 Zone-1

M M

Zone-2 Zone-3 HvdsT-off

M

M

M

Inter-zonal

exchange

Zon

e-3

M

11/.44 KV

DTL 66 / 11 KV PTR

Metering Details Nos. Remarks

Total DTL interface points 95 All ABT compliant

Data in 15 min. interval, 0.2S

Total TPDDL check metering points 202 Communication through AMR

At 220 kV level 3 ToD meter

At 66 kV level 35 ABT compliant

At 33 kV level 50 ABT complaint

At 11 kV level 114 0.5 class metering

SL-1 :Total Input Calculation

• There are total 23 Energy exchange grids

SL-1 :Total Input Calculation

ALL Elster make ABT meters at

Grid Panels Meter Inside Metering

Cubicle Metering With Outdoor

CT/PT UnitsSNo Meter Make Model Accuracy Class Basic Parameters Communication

protocol

Meter Type Software

1 Honeywell

(Elsters)

A1800,

A1621

0.2S 12 channel ; Phase wise

Voltage, Currents, Active

power, Reactive Power,

Max Demand (3ph)

RS232, RS485,& Optical

Port (AMR Based Data

Downloading)

3ph 3wire & 3ph 4

wire; 66KV/33KV/110

V 1A & 5A

PEARL (Proprietary

software from Elster)

SAP integrated

Calculations

2 Secure (11KV) 0.5 12 channel ; Phase wise

Voltage, Currents, Active

power, Reactive Power,

Max Demand (3ph)

RS-232 , Optical Port 3ph 3wire & 3ph 4

wire; 11KV /110 V

SAP integrated

Calculations

3 ABB (11KV) 0.5 12 channel ; Phase wise

Voltage, Currents, Active

power, Reactive Power,

Max Demand (3ph)

RS-232, Optical Port 3ph 3wire & 3ph 4

wire; 11KV /110 V

SAP integrated

Calculations

4 L&T (11KV) 0.5 12 channel ; Phase wise

Voltage, Currents, Active

power, Reactive Power,

Max Demand (3ph)

RS-232 , Optical Port 3ph 3wire & 3ph 4

wire; 11KV /110 V

SAP integrated

Calculations

Meter Data : What all data we are interested in?

Energy data

• Past month energy data

• Time of Use data

• Maximum Demand

Historical Data

• Load Profile

• Power Outage Data

• Programming and configuration

Event Data

• Illogical Electrical Conditions with date and time of Occurrence and Restoration

Billing

Energy Audit & Planning

Surveillance

Service Level-1- Three processes

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DTL ABT meter energy and

TPDDL check meter

energy mismatch calculation.

Monthly

Reactive energy bill verification

Weekly

UI bill energy verification

For mitigating

chances of error

by DTL

while compiling bills.

Financial Impact

Energy Audit Reports

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TPDDL Energy Input Report

Energy Audit Reports

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UI Bill Energy Verification

Energy Audit Reports

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Reactive Bill Energy Verification

Best Practices in Interface Metering

• Redundancy in Metering Arrangement at each level • Remote Data Downloading / SCADA / JOINT METER

READING• ZERO ASSESSMENT • SLA based Meter Replacement • Energy Metering Integrated at Planning and Project

Execution Level P-1 Notification for system alteration

• SAP Based Data Management , Report Creation • REGULAR CALIBRATION • TIME SYNCHRONISATION

SL-2 : Zonal/ Divisional Accounts

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Aggregation of 11kV Feeders energy for Zones / Divisions

Projection of sub-transmission loss

Input for AT&C Report .

Setting goals is the first step in turning the invisible into the visible - Tony Robbins

Service Level-2

SL-2 : Zonal/ Divisional Accounts

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Best Practices in SL-2 Metering

• REMOTE DATA DOWNLOADING using OFC Network.• Incessant effort to improve efficiency to highest level.

• 100% metering at each Panel ( 2 level Metering)• Zonal Level Input Finalisation has strong Operation team

involvement (Monitoring & Feedback by Operation Teams).• Half Yearly Input Parameters Validation exercise with

operation team.

Service Level-2 (Data Download through TCP/IP Serial Converter)

AT & C Loss

AT&C - overview

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Input energy : SL-2 report

Collection Amt. : BW-HANA

Billed Units : SAP

Billing Efficiency

Collection Efficiency

AT&C

Billed Amount : SAP

AT&C Loss (%) = [1-Billing Efficiency X Collection Efficiency ] x 100

Calculating Billing & Collection Efficiencies

Source –BW-HANA

1. Units Billed = Total Units billed (Non KCG)+JE units+ reversal units + STL metered units + STL unmetered units + TPDDL building units + Theft units + HT KCG units + LT KCG units+ 2.1A (sales form) units reconciliation adjustment

2. Amount Billed = Total Amount billed (Non KCG) + JE amount+ Reversal amount + STL metered amount + STL unmetered amount + Theft amount + HT KCG amount + LT KCG amount + 2.1A (sales form) billed amount reconciliation adjustment

3. Collected Amount = Non KCG collection + subsidy + cheque bounce + theft income + STL metered collection + STL unmetered Collection + LT KCG collection + HT KCG collection + JE collection – maintenance charge + 2.1A (Sales form) total collection reconciliation adjustment

Billing Efficiency = Units Billed / Input Units

Collection Efficiency = Collected Amount / Billed Amount

AT&C Report

”Excellence is the gradual result of always striving to do better.”

Measuring Losses @ DT (SL-4)

– Objective : DT level Loss Estimation

(D&B)

– Meters installed at each 3 Phase Distribution

Transformers. (Secondary Side)

– At HVDS T-Offs (With O/D CT-PT Units)

– LT CT meters installed with 10 core cables

– underground Cabling

– Monthly reading and MIS Publication

- Peak Load , DT Loading , Unbalanced Load

Details to Operation Team

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Service Level 4- Report

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DISTRICTDistrict

TotalBDL 136 70 28 1 40 275

BWN 52 53 46 63 75 289

CVL 105 169 28 4 33 339

KPM 132 100 14 0 18 264 NC = *Loss Not Calculated

MDT 155 103 22 0 23 303 *Reason for Loss Not Calculated

MGP 175 134 32 3 44 388 1. Faulty DT Meters

MTN 129 180 20 4 66 399 2. Data Not downloaded

NRL 55 96 80 43 107 381 3. SAP issue

PPR 234 170 24 1 29 458 4. Consumer Indexing / Abnormal Energy

RHN 415 236 52 2 46 751

SKN 96 93 2 0 9 200

SMB 123 213 32 6 23 397

TPDDL 1807 1617 380 127 513 4444

% Summary for DT to Consumer energy mismatch for month of Apr'17--May'17

-5 to 5 % 20 to 45 %5 to 20% > 45% NC

Best Practices in DT Metering

• Loss calculation through SAP integrated with GIS DT Profiles (DT Code, Meter No, Consumers) in SAPMeter Installation , Change through SAP notification Faulty Meter is tracked through Notification and

rectification is updated by the user itself.

• Nodal officers at EAG / Zonal

• DT Loss monitoring at Multiple Review Levels.

• Regular Training in TPDDL Centres for the Business Associates employees and supervisors.

Best Practices in DT Metering

• Use of 10 core UG Cable within the DT Installation• Remote Data Downloading through AMR • Re Sealing of Each meter by the Meter Readers• New Installations energised after Internal Quality Audit.• Introduction of New DT Metering Kit

• CT /Cable / Meter Boxes along with 10-pin terminals is prefitted • No onsite wiring connection to be done (plug & fit)

What next ?

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Smart Meters For Distribution Transformer in Phase I To be extended to all Energy Audit Meters within Two Years.

Dynamic Network Planning and Augmentation using Energy Metering Data Distribution Transformers may be Augmented using Peak Load in short Time frame. Dynamic Technical Loss calculation at each level

Power Quality & Reliability Monitoring PQ Meters are going to be installed at strategic location PQ issues included in Supply Code

Use of Analytics in Energy Audit Analysing Data and Predicting the losses Creating Dynamic Dashboards, Trends , and user defined Reports

Any Questions ?

Thank You