tech interface in power distribution

7/30/2019 Tech Interface in Power Distribution

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Technology Interface in Power Distribution

1) Incoming Power Corridor/RoW issues:

High Ampacity conductors

- Double the MVA capacity with same towers

- Low sag

- Proper Ground clearance in spite of hutments below

the lines/towers

-Gap type conductors, Al Composite Core Conductors, INVAAR

conductors available

2) XLPE cables at 220/132/110/33 kV

- Light weight silicon terminations with possibility to terminate on tower cross

arm

3) Receiving Stations to handle bulk power

- High cost /Non-availability of land

- Hybrid Switchgear (Air-SF6) saves space by about 30%

- GIS at EHV/HV/MV saves space by about 90%


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4) Power Transformers:

Transformers with COPS

- No contact with contaminated air/moisture avoidingmajor maintenance, improving reliability and life

- Non breathing type transformers are recommended for all Power /

Distribution / Sub station transformers

- For old transformers Online filteration eqpt. & Low Freq. heating

methods

On line monitoring- Hot spots by fibre optic sensors

- Bushing Tan delta

- DGA

- Thermo-vision scanning

Integrated Numerical Controller- Temp indication

- Cooler control

- On line DGA monitors

- Thermal modeling

- OLTC control & Monitoring


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5) Distribution Transformers:

- OLTC for better voltage regulation- Dry type Transformers for safe operation

- Sealed Transformers for longer life & less maintenance

6) Sub-stations:

Package Substations- Spacing saving

- Dry type / Sealed transformers used

- Quick to install/commission

- Factory tested- Arc-proof

- Safe working

- Aesthetic appearance


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7) Network:

Use of SF6 filled RMUs (3 way / 4 way)

- space saving

- safe operation

- quick to install- factory tested

- fault passage indicators

Sectionalizers and Auto-reclosers

- with use of fault-passage indicators, faulty sections can

be quickly isolated and power can be restored

automatically


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8) Network Management:

Integrated SCADA for R/S and Distribution Automation System

(DAS) for S/S

- Quick / remote restoration in couple of minutes

by rearranging the feeder ring

- Restoration not affected by

traffic jams on roads

- Better utilization of man power for higher level work

- Alarms to Maint. Crew by SMS alerts,mobile vans

- Cable / Transformer load data archiving for future

studies, statistics and planning- Use of dedicated or public FOP / GSM / CDMA network

for communication and control make modern SCADA

and DAS systems effective


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9) Loss Reduction in Distribution:

High Voltage Distribution System (HVDS)- 11 kV / 415 V small pole-mounted transformers

- 25 kVA / 50 kVA transformers with metering for energy

accounting

Aerial Bunched Cable (ABC) Overhead System

- For better control and reliable

connections

- Cost saving

- Safe for public


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10) Electronic Meters:

- Tamper proof- AMR features- Built-in

PLCC,GSM,CDMA

- Pre-paid meters

- Time-of-Day feature for

Demand Side Management

through tariff structure

- 100% Electronic meters


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11) Geographical Information System (GIS):

Consumer Indexing through GIS networkmapping through GIS

Updating of records -Any change in theelectrical address can be updated as part of aprocess in GIS map which further gets updated

in the consumer Billing database.

Address formatting-consumer addresses canbe formatted to ensure easy retrieval andanalysis.

Network planning

new cable routes,transformer locations etc can be planned

effectively

Maintenance GIS maps can be used toidentify / rectify faulty sections

Illustrated GIS map


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12) Energy Accounting Un-accounted energy is the

single biggest problem of Distribution system in India- Energy Accounting by extensive use of IT

- Energy meter for each Distribution Transformer

- Feeder wise energy meters / accounting

- AMR for reduction in billing cycle time

- AMR by GSM / CDMA for major industrial customers

- AMR by RS 485 / Data concentrators for commercial

customers

- AMR for residential customers by use of PLCC

- Direct connectivity of AMR system to billing computersto eliminate human intervention

- Use of IT to connect these energy meters for central

monitoring and accounting


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53%

51.1%

44.86%

26.5%

23.7%

23%

28%

33%

38%

43%

48%

53%

J u l - 01 N ov- 01 M a r -0 2 J u l - 02 N o v- 02 M a r -03 J u l - 03 N o v- 03 M a r -04 J u l - 04 N o v- 04 M a r -0 5 J u l - 05 N o v- 05 M a r -0 6 J u l - 06 N o v- 06

33.79

Jul 02

(Privatisation)

FY 2002-03

FY 2003-04

AT&C Lossrising before

privatisation

Post

privatisation

reduction in

FY 2004-05

The Loss Reduction

FY 2005-06FY 2006-07

Cumulative Since Privatization

Committed Reduction -12.75%

Effective Reduction29%

Mar 07



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13) Use of Information Technology (IT):

For customer interaction, confidence, retention and delight

Call centers

- for better customer interaction

- complaint management

Web Based System

- Billing information

- On line bill payment

- Complaint management

SMS based complaint management

- maintenance crew informed through call center

immediately after receipt of complaint

Call Receivedat CallCentre

Consumerinformed &Call closed

Complaint

attended & CallCentre informed

SMS Sent toconcerned crew

K.R. Kalra32B Rohini

No Current

15mins


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CMG RRG RDGMRG RBG RCGMMG

RAG

Policy Regulatory Bench Data Revenue Infrastructure User& System

Advocacy Compliance Marking Analysis Protection Support Administration

Consumers

Call CenterCustomer care

Center Website E ailletters

Drop boxes

CCG

Integrated Commercial Package software- Industry First!!



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14) Power Quality:

- IT parks / DC devices generate more harmonics- Use of active and passive filters necessary to control the

harmonics

- UPS for maintaining the continuity of supply

- Use of fly wheels and magnetic field storage devices for

uninterrupted power supply for important loads like

huge data storage devices

- Use of shunt capacitors for riding over voltage dips

- Automatic Power Factor correction at the Distribution

Transformer


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15) Demand Side Management (DSM):

Energy efficient Appliances- T5 fluorescent tube lights

- Electronic chokes

- CFLs

- Efficient motors and compressors

- Street light control by GSM

Meter as Gateway using PLCC

- In addition to meter reading the PLCC technology canbe used for switching-off non-essential loads like

geysers, air conditioners etc during peak hours or

emergencies


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SCADA

Single Window Consumer

Grievance/ Service Centre

Remote Operation

of Substations

Area MISUp gradation

of network

Mobile Service

Stations 1

Industrial Units

Data

Local Area

Load Forecast

DTC Wise

ATC Losses

AMR of Selected

Consumers

Mobile Service

Stations 1

Mobile Service

Stations 1

ReliabilityReduction in

AT & C losses

Planning


tech interface in power distribution

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