Meter Communication

8/8/2019 Meter Communication

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Capital Power Systems Ltd.


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SMART METER

Record electricity consumption by the half hour;

Be remotely read so a meter reader does not have to

visit your home or business;

Provide consumption and price information via an in-home display

Enable billing queries to be resolved quickly

Allow remote connection of your electricity

Help electricity distributor to detect and locate outagesand restore supply more quickly; and

Monitor the quality of your electricity supply


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ENERGY METER IN PAST

These are basically induction type meters where rotation is

proportional to the energy being consumed.

Electromechanical Meters:

Limitations of Electromechanical Metera) Difficult to achieve high class accuracy.

b) Drift in accuracy

c) Tamper Prone:By Tilting

Load connected to earth


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ELECTRONIC ENERGY METER

A watt-hour meter in which current and voltage act on a solidstate (Electronic) elements to produce an output proportional to

energy is called electronic/ static energy meter. The electronic

energy meter can be classified into two groups :

ASIC (Application Specific Integrated Circuit )

based energy meterMicro Controller based energy meter

Advantages

Very HighAccuracy

Control FULL

Communications Built in (on chip / PCB)

Theft Detection High (Network level)


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Highly Person dependant.

Human errors cannot be avoided.

Accessibility of meters in rural/ Agricultural zones.

Energy Audits performed based on bill collectionwhich is highly inaccurate.

Billing done mainly on estimated/ monthly averagebasis

Inability to monitor and control discrete loads

Billing cycle requires excessive time.

Meter data used only for billing, cannot help inanalysis like demand analysis, energy audit,pinpointing losses, etc.

ISSUES WITH STAND-ALONE METER

READING


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Optical Port GSM LPR IR

Majority of the electronic energy meters have communication

facility in the form of an optically isolated pair of Transmitter and

Receiver.

For transporting the data from the energy meter to the Host PC acommunication media is necessary i.e.

COMMUNICATION MODES

IN ELECTRONIC METER


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Optical Port interconnecting two Intelligent ElectronicDevices (IEDs) for electronic communication.

OPTICAL PORT

There is a wire for each signal, together with the ground signal (reference

for voltage levels).

This interface is useful forpoint-to-point communication at slow speeds. For example, port COM1 in a PC can be used for a mouse, port COM2 for

a modem, etc. This is an example of point-to-point communication: one port,

one device.

Due to the way the signals are connected, a common ground is required.

Shortly, RS 232 was designed for communication of local devices, and

supports one transmitter and one receiver.

LIMITATIONSThis implies limited cable length - about 30 to 60 meters maximum. (Main

problems are interference and resistance of the cable.)


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Optical Port

Energy

Meter PC or CMRI

BLOCK DIAGRAM OF

OPTICAL PORT


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Introduction to AMR

1)Automatic Meter Reading is a process of digitally noting the

energy meter reading(s).

2) This process eliminates the errors associated with manual

reading/recording/processing of the meter data

AMR came into existence since energy meters turned intelligent which

dates back to the deployment of microcontrollers in energy meters.

AMR has been evolving for the last two decades and has two broad

classification based on the distance between the meter reading

station and the target meter.


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Meter readings is the feedback loop for the utilitys efficient operation,

and besides completing the revenue cycle, the meter reading providesvital data for the following utility operation:

Meter Data

Engineering Group

Energy Audit

Billing

Tariffs formulation

Electricity regulator

Load Research

Meter reading, a retrospection


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GSM (GLOBAL SYSTEM FOR MOBILE

COMMUNICATION)

A GSM network is composed of several functional entities, whose

functions and interfaces are specified. The GSM network can be

divided into three broad parts.

The Mobile Station is carried by the subscriber. The Base Station Subsystem controls the radio link with the

Mobile Station.

The Network Subsystem, the main part of which is the Mobileservices Switching Center (MSC), performs the switching ofcalls between the mobile users, and between mobile and fixednetwork users. The MSC also handles the mobility managementoperations.

The Mobile Station and the Base Station Subsystemcommunicate across the Um interface, also known as the airinterface or radio link. The Base Station Subsystemcommunicates with the Mobile services Switching Centeracross the A interface.


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GSM ARCHITECTURE


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GSM IN TECHNICAL & COMMERCIAL

PROCESS


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The LPR systemhas anadvanced option whereby themeters whichareavailable in theradio rangecanbe identified.The identifiedmeters aredisplayed on the MRI screen with the flagof read incase the samearereadand theirmeterreadings areavailable in thespecific MRI.

Following are the distinct advantages of low power radio (LPR)

1) Readingof inaccessiblemeters likemeters connected on pole-topfor tamperdeterrence orreadingthe Distribution transformermeterinstalledat aheight to protect it fromvandalism.

2) Readingof meters inan industrial area fromacentralized location.3) Establishinganad-hoc wireless monitoringstation for industrialarea / tamper prone zone.4) Collectingmeterreadingin locked properties.5) Meterreadings inun-safe or prohibitedareas.

LPR (LOW POWER RADIO)


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LPR

LPR

LPR

Server (May bePC or CMRI)

Remotely read meters over a 100-150 mtrs range with mobile

radio.


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System Block Diagram


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PollingPolling is a technique by which a single data collection device can be

shared with multiple meters (or slave devices) without changing anyhardware configurations like switching.

Energy

Meter 1

Energy

Meter 2

Energy

Meter 3

Energy

Meter n

Transmit line

Documents

Meter Communication