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METER MANAGEMENT GROUP Functions & Organization

by

Mr. Avinash Karanpuria

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Agencies

• Generation • Transmission• Distribution

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Organization Chart of Distribution Utility

MD

Material Management Distribution Metering (MMG) Vigilance Revenue

& Finance Planning Admin & HR

Chief EngineerCommercial

SE (M & P)

XEN (Distribution Circle)

Meter Testing Lab(AEN & JEN)

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Functions of MMG…..

• Selection of metering equipment.• Installation of metering system.• Calibration of metering equipment at site on regular

intervals as per the guidelines of regulator.• Meter Reading & Billing of consumers for Revenue

Recovery.• Testing of metering equipment in the Lab. • Energy & Loss Accounting.• DT Metering.

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Selection of metering equipment… • It depends upon the load/Voltage/Demand Level of the

consumer.– Single phase meters installed up to 5 KW load.– Three phase direct current meter installed between 5KW to18KW. – LTTV meters are installed for load above 18 KW & maximum

demand up to 50 KVA. – 11/0.110 KV HTTV meters are installed for maximum demand

between 50 KVA to 800 KVA.– 33/0.110 KV HTTV meters are installed for maximum demand

between 800 KVA to 5000 KVA.– 132/0.110 KV HTTV meters are installed for maximum demand

between 5000 KVA to 8000 KVA.– 220/0.110 KV HTTV meters are installed for maximum demand

above 8000 KVA.– ABT meters are installed on open access consumers.

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• Tariff is divided into three parts

• Consumers are billed on the basis of KWh consumed.• Meters for all consumers below 18 KW load will be billed on the

basis of KWh consumed.

• Fixed charges are levied on the basis of sanctioned connected load/ maximum demand.

• For connected load above 5 KW but maximum demand up to 50 KVA fixed charges are levied on the basis of connected load.

• Fixed charges are levied on the basis of maximum demand where maximum demand exceeds 50 KVA.

• It will be obligatory on the part of consumer to maintain the PF of 0.9. Incentive will be allowed if the PF is above 0.9 & penalization if PF falls below 0.9.

• This clause is applicable for connected load above 18 KW.

Selection of metering equipment…

Energy ChargesEnergy Charges

Fixed ChargesFixed Charges

Power Factor (PF)Power Factor (PF)

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Installation Of Metering System

Metering is done at• Generating Station• EHV Sub Station • HV Sub Station • Distribution Sub Station• Consumer’s Premises :-

– Single Phase meters.– Three Phase meters. – LTTV( LT Tri vector) meters– HTTV( HT Tri vector) meters– ABT( Availability Based Tariff) meters

LT-TV-MetersLT-TV-MetersHT-TV-MetersHT-TV-MetersSingle Phase MeterSingle Phase MeterThree Phase MeterThree Phase MeterABT MetersABT Meters

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Metering equipment calibration at site• It is to be done as per the guideline of the regulatory

Commission.• Regulator is an independent body constituted under the

provision of Indian Electricity Act 2003.• Regulatory body is at central & state level both.• Intra state affairs of Generation/ Transmission/ Distribution of

power are governed by Central Regulator.• Central commission also advises government for formulation

of National electricity policy and tariff policy.• Electricity affairs with in the state are governed by state

regulatory body.• As per the regulator, the metering equipments installed at

different location/level are to be calibrated on site at regular interval to check the performance of metering system.

• The calibration system ensures proper functioning of metering at all ends.

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Meter Reading & Billing of consumers for Revenue Recovery.

• In old days electromechanical meters were used for measurement of Energy.

• In above meters, meter reading was done manually having no authenticity of correct reading.

• To overcome the issue electromechanical meters were replaced by Static Digital Electronic meters.

• In case of Static meters data is stored in separate register for 00:00 hours of last day of calendar month to be used for billing purpose.

• This data will be available on display for next thirty days. • All the meters are Static digital type meters wherein data is stored on daily

basis.

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Different Features of Static Digital meters…Meter Reading & Billing of consumers for Revenue Recovery.

VoltageVoltage

CurrentCurrent

FrequencyFrequency

Power FactorPower Factor

Active, Apparent, Reactive EnergyActive, Apparent, Reactive Energy

Load & DemandLoad & Demand

Real date & timeReal date & time

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• Different type of data is stored in meter– Billing History– Half hourly data/ Time stamped data – Tamper event logging with date & time – Analysis of tamper events can reveal the malpractice.– Assessment of energy on account of malpractice– Loss of Energy on account of pilferage is accounted by means of

tamper data. – All the above data can be downloaded electronically & cannot be

edited.

Meter Reading & Billing of consumers for revenue recovery…

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• Meter are read by meter readers( ITI/ Technician) & MMG engineers. • Direct connected Single & Three phase meters are read manually by

meter readers or by HHU if required.• CT operated meters are read through HHU • HHU readings are electronically transferred to the billing agency.• High end consumers are remotely read through AMR.• Data is collected remotely on real time basis by means of communication

link like GSM/GPRS/PSTN. • AMR data is directly sent to billing agency ,which will generate the bills• Electronic data ensures zero defect in readings.• The issue of bills is faster leading to timely collection of revenue. • The consumer queries/complaints can be handled by the aid of retrieved

data from meter.

Meter Reading & Billing of consumers for revenue recovery…

Submission of data & MIS reports to utility

Meter(s) data and remark dumping at site office

Validation check of meter data

Preparation of follow up cases and quality checks for cross verification

Bill generation at premises

Start

Creation of consumer database

Meter reading at site (With remarks

Field visit to capture meter reading and remarks

Data dump at site office and preparation of export file

Preparation of MRI/HHU with attached printer

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Testing of metering equipment in the Lab.

– Mandatory sample meter testing for each lot as per IS standard

• 1 % Sample is collected from the lot supplied in the DISCOM store.

• Each sample is inspected for accuracy check on sample basis.• If the samples are up to the mark then lot is accepted otherwise

whole lot rejected. – Routine testing of 4% meters from each procured

lot.• After acceptance of mandatory tests, routine tests is carried out

on 4 % of meters supplied.• All the accepted meters are properly sealed for identification.

For single & three phase metersFor single & three phase meters

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Testing of metering equipment in the Lab.

• 100% testing of replaced/repaired meters by firm.– The procured materials is warranted for specified period. In case of

any failure during warranty period supplier has to replace/ repair the defective material.

– 100 % meters replaced by supplier in lieu of defective meters under warranty period are tested & sealed.

• Verification of tamper features & MRI communication as per purchase order.– The static meters have a inbuilt feature to record abnormal

conditions such as PT/CT missing etc with date & time stamping. – Meters under test are subjected to such abnormal conditions in the

lab by stimulating tamper conditions. – The conditions recorded by meter are verified through the data

stored in meters with the help of MRI– This data is verified for correctness of MRI communication, MRI

software, communication cord, port & BCS.

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• Testing of HT/LT-TV meters.– Routine testing of 100 % HT/LT-TV meters.– Testing of meters for MRI communication and tamper features.

• SEALING – Seals arrangements are available for sealing meter body, terminal

plate, communication port & meter box.

– Seals are provided by the testing laboratory on the meter body.• Rest of sealing arrangement is provided to the filed staff during

installation at meter site. – The seal confirms that the meter has not been tampered & is in the

same condition as delivered from the lot.• The intactness of seal can be verified on any later date.

Testing of metering equipment in the Lab…

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• Testing of CTS’ & PTS’– Testing of LTCT purchased by department/ consumer.– Testing of 11kv And 33kv CT/PT sets purchased by department/

consumer.– Testing of LTCT,11kv And 33kv CT/PT set on site (If required).

• Testing consumer complaint/disputed metering equipment.

– Accuracy check at various load.– Findings about meters being tampered.– Providing meter reading /history report to operations & maintenance

when ever required.– Testing of removed CTS’/PTS’ from site.

Testing of metering equipment in the Lab…

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• Testing of old & used meters for reusing.– Testing of single and three phase old and used meters removed from

site. – Testing of old and used HT/LT-TV meters removed from site.– Testing of LTCT and CT/PT sets removed from site.– Assessment of energy is computed if accuracy of the removed

metering equipment is found beyond permissible limits.

• Training of field staff– Theoretical & on job training is imparted to staff.– Practical session is also conducted for recording of readings, analysis

of tampers & other features.

Testing of metering equipment in the Lab…

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Energy & Loss Accounting..• Measurement of energy at every injection point like :-

GenerationGeneration

Inter grid transmissionInter grid transmission

Distribution level substationDistribution level substation

Distribution transformersDistribution transformers

Consumer metersConsumer meters

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Energy & Loss Accounting..

MDI/EM08/5th June 2009

DT-1

DT-2

Consumers

LT Network 1

LT Network 2

Underground Cables

Underground Cables

Jumble of Overhead Cables

Jumble of Overhead Cables

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Energy & Loss Accounting..

Benefits of Accounting– Reconciliation of Energy at different levels.– Identification of Losses at every voltage level– Commercial losses at Distribution voltage (DT) level. – Losses at Unit level to judge its performance.– Cash Flow for purchase of power can be forecasted.

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Generation

Interconnected Transmission system (EHV)

Radial distribution system (HV)

Tail-end radial LT distribution

11 kV Feeders

Distribution Transformers (DTs)

Consumers

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Distribution Transformer Meters

• They link sub transmission system with the tail end of distribution system – they are “link meters”

• They constitute final stage of distribution system metering & give best benefits

• Their application covers 3 aspects• To monitor operating conditions of the DT • For load flow & energy audit studies• For revenue protection & DMS

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Benefits of DT meter….

• Energy Accounting.• Trend data of DT monitoring.• Unbalancing monitoring & its control.• Reactive compensation requirement management.• Supply Reliability.• Segregating up stream & downstream reliability.• Providing data for load flow studies.• Number & nature of faults in LT system.• Indentation of fault maintenance time.• Loss making areas can be identified by DT metering.

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Activities of Meter Management Group….

• Daily field Activities -– Testing is performed at Site by Meter Management Group. The Meter at

Site is tested at Consumer load / running load. – Checking & testing of metering equipments for releasing new

connections/Load extension/Change of defective metering equipment.– JIR (Joint Inspection Report) is prepared by field officer.– JIR data is send to billing agency– Accordingly the master data is updated – Load Survey

• To measure Supply Reliability on the feeder.– Assessment on account of tamper events.– The tamper cases are investigated with the help of the Vigilance dept. – Testing of CT & PT.– Updation of data of consumers.

5 kV & 0.5 KV Megger5 kV & 0.5 KV MeggerDG SetDG Set

Red Phase

MRIMRI

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Activities of Meter Management group….

• Support activities– Preparation of technical specifications for Procurement of Metering

equipment.– Inspection and Mandatory testing of purchased metering equipment

at manufacturer premises.

• THANKS