Maheswaram Mandal, Ranga Reddy District: GIS Asset Management, power availability assessment and los

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Maheswaram Mandal, Ranga Reddy District GIS
Asset Management, power availability assessment
and loss reduction options
T. Radha Krishna Reddy , GECE January 21, 2003
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Objectives

• To bridge the policy gap between the water and
  energy sectors
• To provide accurate and current data on
  distribution system
• To improve the quality and reliability of power
  supply

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Activities

• Geographic information system and asset
  management system
• Pumpset survey
• Technical loss estiamtion
• HVDS upgrade
• Method for technical loss reduction
• Refurbishment of network

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Approach

• Regular (daily) interaction with APCDCL from
  assistant engineer to director technical level
• Standard software (PowerNet application) utilized
  
• Completed and validated GIS asset inventory data
  maps shared with APCDCL field staff
• Assisted in HVDS project formulation for farmer
  and utility demonstration
• Assisted in pilot HVDS implementation for 2
  transformers

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Status Of Existing Electrical Network

• No of 11kV feeders
  2
• No of Distribution Transformers 89
• 11kV line
  52.51km
• LV line
  154.79km
• No of Agricultural Pumpsets(8/02) 1203
• 11kV Voltage Drop
  10.32
• Energy Loss (Technical)
  16.20
• Technical and Commercial Losses( total) 33.56
  

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Quality of Power Supply

• No of 11kV feeders
  2
• No of 11kV feeders with voltage drop with in
  permissible limits 0
• Total no of LV feeders
  111
• No of LV feeders with voltage drop with in
  permissible limits 39
  
• No of Pumpsets
  1203
• No of Pumpsets with voltage drop within
  permissible limits 71
  

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Existing Voltage Profile at Pumpsets
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Case Study Sample from both feeders
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Causes for High Voltage Drop

• Lower size of Conductor
• Long LV lines
• Low Power Factor
• Unauthorized Customers
• Un-authorized additional loads by existing
  customers
• Non Standard Joints in the line, particularly at
  the tension points.

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Revisiting the Vicious Cycle
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Impact of Low Voltages
Efficiency of Pumpset falls by 1.5 for 5 drop
in Voltage
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Works Proposed in the Project

• High Voltage Distribution System
• Strengthening of 11kV network
• Refurbishment of 11kV network

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Basic Design Parameters of HVDS

• One transformer for 2 to 4 pumpsets
• Separate Transformers for non-agricultural loads
• Maximum length of LV line is 300 meters
• Independent AB cable for each pumpset direct
  from transformer

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Advantages of HVDS

• Technical loss will be reduced due to reduction
  in LV line lengths(I2R)
• Reduction in Commercial losses since it is
  difficult to tap from AB cable (elimination of
  unauthorized customers and theft)
• Pumpset efficiency will be improved due to better
  voltages

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Advantages of HVDS

• No need to use Voltage stabilizers, which results
  in improvement in power factor
• Reduction in failure rate of transformers
• Reliability of supply will be improved since any
  fault in HV system will be immediately known at
  the Substation / Controlling Officer.
• Voltage fluctuations will be avoided

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Works proposed in The project
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Comparison of network After Conversion to HVDS
and optimization
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Maheswaram Mandal Consumer Benefits
Voltages at customer premises
Unauthorized Pumpsets
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Study Wise Peak Power loss and Energy Loss Both
Feeders
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Financial benefits
Total Ag Services recorded 1203, unauthorized
services 508 Total other services recorded
1250
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Cost Benefit Analysis
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THANK YOU