Tariff Metering

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Tariff Metering

  1. 1. Tariff Metering At Hub Power Station Presented by : Hammad Ali Khan
  2. 2. Overview of the Presentation <ul><li>Defining Metering & Data Collection System </li></ul><ul><li>Metering Scheme at Hub Power Station </li></ul><ul><li>Annual Accuracy Check Activity </li></ul><ul><li>Problems Identified in Current System </li></ul><ul><li>Proposed Solution </li></ul><ul><li>Q &A Session </li></ul>
  3. 3. What Is Metering and Data Collection? <ul><li>This refers to the electronic collection of the energy values registered by electricity meters. </li></ul><ul><li>Active and reactive energy meters produce pulses, each representing a quantity of energy. </li></ul><ul><li>The number of pulses counted in, say, 30 minutes is a metered amount of energy known as a half-hour demand. </li></ul>
  4. 4. Metering Scheme at Hub Power <ul><li>Metering Panels Layout </li></ul><ul><li>Outstations </li></ul><ul><li>Meters </li></ul>
  5. 5. Metering Panels Layout Outstation 1 Outstation 2 E E I E I E I E I E I E I I I E MW MVar MW MVar MW MW MVar MVar Main Check Line 1 Line 2 Line 1 Line 2
  6. 6. Outstations <ul><li>Outstations connected to the meters provide the means of logging these cumulative demand values. </li></ul><ul><li>They have the ability to retain that information in memory until such time as it is collected by a central computer or remote collector station. </li></ul>
  7. 7. Outstations Outstation 1 Outstation 2 HUBCO (Remote Collector) WAPDA (Remote Collector) Hub Power Station (Local Collector)
  8. 8. Outstations <ul><li>Kenda's software, known as MDCS-SG, is running in a local system at the power station itself and in two remote systems. </li></ul><ul><li>Operating in conjunction with KENDA'S METEOR RANGE OF REMOTE DATA-COLLECTION outstations </li></ul><ul><li>The MDCS-SG software acquires metering data for the specified demand period, stores it in a database and performs calculations to provide total values and costs for billing purposes. </li></ul>
  9. 9. Energy Meters <ul><li>Static Energy Meters from CEWE INSTRUMENTS (Sweden) </li></ul><ul><li>2 Models used-Active Type CEP 32 and Reactive Type CEQ 32 </li></ul><ul><li>In total there are 8 meters installed </li></ul><ul><li>It generates output in the form of pulses for 80 ms (adjustable) </li></ul><ul><li>Accuracy Class 0.2s </li></ul><ul><li>Each pulse is equivalent to 100KWh </li></ul>
  10. 10. Accuracy Check on Energy Meters <ul><li>Power Purchase Agreement (PPA) calls for a regular accuracy check on the tariff meters. </li></ul><ul><li>A detailed procedure is maintained which highlights step by step the activity. </li></ul>
  11. 11. Equipment Required <ul><li>3 Phase Voltage and Current Injection Test Set (Freja 300) </li></ul><ul><li>GEC Injection Test Plug </li></ul><ul><li>Test Leads </li></ul><ul><li>Accuracy Check Equipment-Class 0.1 ( 2 Nos.) </li></ul><ul><li>Local Interrogation Unit and lead for Outstation Programming </li></ul><ul><li>Clamp on Meters </li></ul>
  12. 12. Order of Activities Performed <ul><li>Breaking of Seals on Main Panel </li></ul><ul><li>Accuracy Check on Main Meters on Line # 1 </li></ul><ul><li>Accuracy Check on Main Meters on Line # 2 </li></ul><ul><li>Synchronization of Outstation 1 </li></ul><ul><li>Breaking of Seals on Check Panel </li></ul><ul><li>Accuracy Check on Main Meters on Line # 1 </li></ul><ul><li>Accuracy Check on Main Meters on Line # 2 </li></ul><ul><li>Synchronization of Outstation 2 </li></ul><ul><li>Sealing of Both Panels </li></ul><ul><li>Completion of Paper Work </li></ul>
  13. 13. Accuracy Check Setup Layout WAPDA HUBCO I in I ret Voltage Calsoft, PWS 2.3 L & G, TVE,102/3 I in I ret Volt FREJA 300
  14. 14. Overview of the Activity <ul><li>Readings on Dial, Outstation 1 & 2 were noted before breaking seals of the Main Panel </li></ul><ul><li>After this, VT fuses associated with Line 1 Energy Meters (2 Nos.) were identified. They were removed. </li></ul><ul><li>Readings on Dial, Outstation 1 & 2 related with Line 1 Energy Meters were noted. </li></ul><ul><li>The appropriate test socket for testing Line 1 meters was identified. </li></ul><ul><li>The test plug (already prepared beforehand) was inserted into the test socket (ensuring that all pins enter the socket at the same time). </li></ul>
  15. 15. Overview of the Activity <ul><li>With the help of Clamp on Meter, it was ensured that the concerned CT was appropriately shorted. </li></ul><ul><li>All injection tests identified in procedure were performed with results noted down on a sheet of paper. Once again Meter Dial, Outstation 1 & 2 readings were noted immediately after the test. </li></ul><ul><li>VT fuses removed were reinserted. </li></ul><ul><li>Steps repeated for Line 2 Energy Meters (2 Nos.). </li></ul>
  16. 16. Synchronization of Outstation Clock <ul><li>The 2 Outstation clocks have drifted with respect to one another and with respect to Pakistan Standard Time (PST). </li></ul><ul><li>It is therefore possible for each Outstation to register slightly different demand data for each half an hour period. </li></ul><ul><li>It is desirable to resolve this issue to enable direct comparison between the data from both Outstations. </li></ul>
  17. 17. Procedure for Synchronization <ul><li>Laptop having LIU (Local Interrogation Unit) software was used. </li></ul><ul><li>Setup Parameters from Outstation was downloaded onto a Floppy Disk through LIU. </li></ul><ul><li>Appropriate Outstation Fuse Link was removed. </li></ul><ul><li>Internal batteries were also removed (Outstation completely powered down). </li></ul><ul><li>DC Supply restored with batteries replaced. </li></ul><ul><li>Setup Parameters uploaded from Floppy Disk back to Outstation. </li></ul><ul><li>Outstation Clock readjusted to PST. </li></ul><ul><li>The Energy Meter Dials were readjusted with Outstation Dials through LIU. </li></ul>
  18. 18. VT FUSES
  19. 19. Line 1 Test Socket
  20. 20. Test Plug with Connection Leads
  21. 21. Freja Test Screen Page Voltage & Current Injection Values
  22. 22. Outstation Fuse Links Outstation Fuse Link
  23. 23. Interconnection Cable between Laptop and LIU
  24. 24. Overview of the Activity <ul><li>All steps were repeated for Check Panel . </li></ul><ul><li>Results evaluated. </li></ul><ul><li>Paper work was completed. </li></ul><ul><li>All panels were sealed. </li></ul><ul><li>The Activity took 3 Days to complete (1st June – 3 rd June 2010) </li></ul>
  25. 25. Problems with Current System <ul><li>One meter, Line 2 Watt Meter (Main Panel) was replaced during current activity, the Meter Dial ((L2 WEM) was not working. </li></ul><ul><li>Two meters L1 VIC, L2 VEM showed errors higher than the allowed limits. </li></ul><ul><li>Meter Errors are getting higher, though still within limits but it is a sign that these Energy Meters are now coming close to their end life. </li></ul><ul><li>Since these Meters are now obsolete, we cannot maintain any spares. </li></ul><ul><li>Meters are now getting unreliable (Aging Factor). </li></ul><ul><li>Failure of Mechanical Dials is troublesome for Operations as it is their source for recording Energy Data. </li></ul>
  26. 26. Proposed Solution <ul><li>Replace Current Energy Meters with Intelligent Digital Meters. </li></ul><ul><li>Replace Current Outstation System with more upgraded system. </li></ul>
  27. 27. Potential Option <ul><li>Cewe Prometer R can be a feasible replacement for the current outdated meters. </li></ul><ul><li>The Nebula Outstation from Kenda Electronic Systems connected to Intelligent Meters . </li></ul><ul><li>The Nebula Outstation is able to be configured with various modules and options permitting a flexible configurable metering solution. </li></ul>
  28. 28. Cewe Prometer R
  29. 29. Cost <ul><li>Cewe Prometer R – Class 0.2S – will cost around £1,800 to £2,000 each. </li></ul><ul><li>Cost of Nebula Unit is around £4,000 each. </li></ul>
  30. 30. Advantages of New System <ul><li>Can read both Tariff and instant readings (e.g. MW,MVAR,MVA,VOLTS,AMPS,FREQUENCY,POWER FACTOR). </li></ul><ul><li>Offers backward compatibility with pulse meter outputs. </li></ul><ul><li>It can be configured to automatically synchronize their time against standard Network Time Servers. </li></ul><ul><li>The use of modern FLASH memory technology means that data does not require any batteries to remain stored in the event of power loss. </li></ul><ul><li>Number of Meters used will be reduced to 4. </li></ul><ul><li>The Nebula Unit can be used as a fully compatible replacement for existing Meteor units. </li></ul>
  31. 31. Q & A SESSION

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