rec drawings

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Index for REC Drawings A: Construction Standards

S.No. Drawing No. Description

Series A : 11 KV Lines Formations

1. A-1 11 KV Lines Protective Guarding

2. A-2 11 KV Lines Conductor Formation and Clearances without Earth Line

3. A-3 11 KV Lines Conductor Formation with Earth Wire

4. A-4 11 KV Lines Supports with out Earth Wire

5. A-5 11 KV Lines Lines Supports with Earth Wire

6. A-6 11 KV Lines V Cross Arm (M.S. Channel)

7. A-7 11 KV Lines Pole Top Bracket

8. A-8 11 KV Lines Permissible Spans (Tables)

9. A-9 11 KV Lines A C S R Conductor Voltage Regulation Table

10. A-10 11 KV Lines Arrangement of Conductor at Angle LOC

11. A-11 11 KV Lines Tapping Arrangement Single Pole Tapping

12. A-12 11 KV Lines Tapping Arrangement First Structure of Length Spur Line

13. A-13 11 KV Lines V Cross Arm (M.S. Angle)

14. A-14 11 KV Lines Automatic Voltage Booster Installation

15. A-15 11 KV Lines Installation of Autoreclosure on D.P. Structure

16. A-16 11 KV Lines Conductor Formation and Clearance of 11 KV 3 Line

17. A-17 11 KV Lines Configuration of Single Phase Line (8 M)

18. A-18 11 KV Lines Configuration of Single Phase Line (7 M)

19. A-19 11 KV Lines Single Phase Tapping from 3 (Phase Neutral)

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20. A-20 11 KV Lines Single Phase Tapping from Single Phase Line

21. A-21 11 KV Lines Arrangement at Tension Locations

22. A-22 11 KV Lines Type of Poles for Angle and Dead End Locations

23. A-23 11 KV Lines Arrangement of Guys for 00 to 100

24. A-24 11 KV Lines Arrangement of Guys for 100 to 600 (Single Pole)

25. A-25 11 KV Lines Arrangement of Guys for 100 to 600 (D.P)

26. A-26 11 KV Lines Arrangement of Guys for 600 to 900 (Four Pole)

27. A-27 11 KV Lines Arrangement of Guys for Dead End Locations (D.P) (Double Pole Support)

28. A-28 11 KV Lines Configuration of S Line (7.5 M) Pole

29. A-29 11 KV Lines Single Phase Tapping Phase to Phase (R& B)

30. A-30 11 KV Lines Single Phase Tapping Phase to Phase (Y& R)

31. A-31 11 KV Lines Single Phase Tapping from Single Phase Line

32. A-32 11 KV Lines Single Phase Line (ACSR) (Voltage Regulation Table)

33. A-33 11 KV Lines Single Phase (Phase Neutral) Voltage Regulation Table

34. A-34 11 KV Lines Permissible Spans for 11 KV Lines with A.A.A. Conductor

35. A-35 11 KV Lines A.A.A. Conductor Voltage Regulation Table

36. A-36 11 KV Lines FRP Top Hamper for 11 KV O.H. Line with Polymeric Ferrule.

Series B : LT Lines

1. B-1 415 / 240 Volts Lines Protective Guarding (Horizontal)

2. B-2 415 / 240 Volts Lines Protective Guarding (Vertical) Across rod Vertical Formation

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3. B-3 415 / 240 Line Horizontal Formation

4. B-4 415 / 240 Line conductor Formation and Clearances

5. B-5 415 / 240 Line Supports Horizontal Formation

6. B-6 415 / 240 Line Supports Vertical Formation

7. B-7 415 / 240 Line Pole Top Bracket

8. B-8 Max. Permissible Span for 3 L.T. Line (Table)

9. B-9 415 V. Line A.A.C. and ACSR Conductor Voltage Regulation Table

10. B-10 415 V Arrangement for Conductor at Angle Loc

11. B-11 Max. Permissible Span for L.T. Line

12. B-12 415 V conductor Formation and Clearances 3 4 to Line

13. B-13 LT Line (Vertical) Clearances

14. B-14 1 Line Horizontal Formation

15. B-15 1 Line Vertical Formation

16. B-16 LT Line PVC Spacer

17. B-17 Earth Knobs for LT Line

18. B-18 Composite Spacer for LT Line

19. B-19 Type of Poles for Angle and Dead Loc

20. B-20 LT Line Arrangement of Guys for 00 to 100 Angle Loc




24. B-24 LT Line Arrangement of Guys for dead End Loc

25. B-25 3 - 5 W Line Arrangement of Guys for 00 to 100


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28. B-28 3 - 5 W Line Arrangement of Guys for 600 to 900 Angle Loc

29. B-29 3 - 5 W Line Arrangement of Guys for Dead End Loc

30. B-30 3 - 5 W Line Vertical Formation Guy Arrangement Dead Loc

31. B-31 3 - 4 W Line Arrangement of Guys for angle and Dead Loc

32. B-36 LT Lines Max. Permissible Span with A.A.A. Conductor (Table) for 3

33. B-37 - Permissible Span with A.A.A Conductor (Table) for 1

34. B-38 LT Lines A.A.A. Conductors Voltage Regulation (Table)

Series C : 11 KV Material

1. C-1 11 KV Insulators and Fittings

2. C-2 11 KV Insulators T & C Fittings

3. C-3 Holding of Conductor on 11 KV Pin Insulator (Straight Run)

4. C-4 Holding of Conductor on 11 KV Pin Insulator

5. C-5 Holding of Conductor on 11 KV Pin Insulator (Angle Loc)

Series D : LT Material

1. D-1 415 / 240 V Pin Insulator

2. D-2 415 / 240 V Pin Insulator and Fittings

3. D-3 415 / 240 V Shackle Insulator

4. D-4 415/240 V Insulators- Shackle type-2

5. D-5 Hardware Fitting Insulators Fitting for Shackle Insulator

6. D-6 LT Conductor Straight Run and Dead Arrangements

Series E : Joints 11 KV & LT

1. E-26 Crimped Tension Joints for A.A.C. / ACSR

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2. E-28 LT Service Connectors

3. E-29 Application of Epoxy Compound on T Joint

4. E-30 HT Bimetallic Connectors for DTR

5. E-31 Helically Formed Fittings

6. E-32 Helically Formed Fittings T-Connectors

7. E-33 Helically Formed Fittings Splice for ACSR Joint

8. E-34 Suspension Clamp and Eye Hooks

9. E-35 Dead End Clamp and Eye Hooks

10. E-38 LT Connectors Non-Tension

11. E-39 Clamped Joint for LT Service Connection

12. E-40 LT Aerial Bunched Cables Current Carrying Capacity (Table)

Series F : DTR Insulation

1. F-1 11 KV / 433 V DTR with D.O. Fuse

2. F-2 11 KV / 433 DTR with AB Switch and HG Fuses

3. F-3 11 KV / 433 DTR for on Line Locations along the line

4. F-4 11 KV / 433 DTR for on Line Locations across the line

5. F-5 11 KV / 433 DTR Location of Earth Pots

6. F-6 11 KV H.G. Fuse

7. F-7 11 KV HG Fuse Mounting Details

8. F-8 LT MultiCore Cables for DTRS

9. F-9 11 KV Air Break Switches Recommended Ratings

10. F-10 Earthing Arrangement for DTR

11. F-11 Installation of Automatic Transformer Disconnection Switches with D.O. Fuse

12. F-13 Single Phase Transformer Arrangements

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13. F-14 Single Phase Transformer Mounting Details

14. F-15 3 Phase Distribution Using Two Single Phase Transformers

15. F-16 3 Phase Distribution Using Two 6.35 KV Single Phase Transformers

16. F-17 Application of Automatic Transformer Disconnection Switches

17. F-18 Recommended Single Core Cables for DTR Table

18. F-19 Single Phase DTR Arrangement

19. F-20 Mounting Arrangement of 25 KVA DTR

Series G : Guy - Arrangement

1. G-1 Guy Assembly

2. G-2 Guy End Assembly

3. G-3 Guying Arrangements Single and Double Guy

4. G-4 Guying Arrangements Fly Guy, Bow Guy

Series H : Service Connection

1. H-1 Service Connection Single Phase Line

2. H-2 Service Connection S Service Connection Meter Board

3. H-4 Service Connection 3 Industrial Bare-wire

4. H-5 Service Connection 3 Industrial Insulated Cable

5. H-6 Service Connection 3 Agriculture

6. H-7 Service Connection - 3 Meter Board - I

7. H-8 Service Connection - 3 Meter Board II

8. H-9 LT Capacitor Ratings and Mode of Connections

9. H-10 Service Connection 1 with MCB Control

10. H-11 Service Connection - 3 Meter Board with MCB Control

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11. H-12 Service Connection Single Phase Meter Board with Plug in Type MCB

12. H-13 Service Connection - 3 Meter Board with Plug in Type MCB

Series J : Crossing of Lines & Earthing

1. J-1 Coil Earthing

2. J-2 Earthing Pipe

3. J-3 Crossing of Power Lines with Railway Track

4. J-4 Crossing of Power Lines Telecommunication Lines

5. J-5 Crossing of LT Power Lines

Series K : Base Plate

1. K4 R.C.C. Base / Ancher Plate

Series L : 33 / 11 KV Sub-Station

1. L1 33/11 KV Sub-Station Standard Layout (Outdoor)

2. L2 33/11 KV Sub-Station Indoor 11 KV Switchgear

3. L 3 33/11 KV Sub-Station Metering Arrangement

4. L4 33/11 KV Sub-Station 11 KV PILC Cables Recommended Sizes

5. L-5 33/11 KV Sub-Station 11 KV XLPE Cables Recommended Sizes

6. L-7 Standard Layout for 33/11 KV Low Cost Sub-Station

7. L-8 33/11 KV Layout of Unattended Sub-Station


Series M : 33 KV Lines

1. M-1 33 KV Line Pole Top Bracket

2. M-2 33 KV Line Standard Length/Working Load of Supports (Tables)

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3. M-3 33 KV Line Conductor formation and Clearances

4. M-4 33 KV Line Pole Top Bracket

5. M-5 33 KV Line ACSR Conductor Voltage Regulation

6. M-6 33 KV Line Protective Guard Table Across Road with External Fuse Protection

7. M-7 33 KV Lines Arrangement of Conductors at Angle Location 00 100 deviation

8. M-8 33 KV Lines Arrangement at 100 600 deviation

9. M-9 33 KV Lines Arrangement at 600 900 deviation

10. M-10 33 KV Lines Tapping Arrangement on Single Pole

11. M-11 33 KV Lines with A.A.A. Conductor Sizes Table

12. M-12 33 KV Lines with A.A.A. Conductor Voltage Regulation Table

Series N : 66/11 KV Sub-Station

1. N-1 Layout-unattended Sub-Station

Series P : 11 KV Switched Capacitors

1. P-1 Installation of 11 KV Switched Capacitor Bank with Separately Mounted CT

2. P-2 Installation of 11 KV Switched Capacitor Bank with Built in CT

3. P-3 Installation of 11 KV Switched Capacitor Bank with Separately Mounted CT

4. P-4 Installation of 11 KV Switched Capacitor Bank with Built-in CT with internal Fuses.


B: REC SPECIFICATIONS

1. SPEC_023 HT Bushing Terminal

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2. SPEC_024 LT Bushing Terminal

3. SPEC_025 General Requirements

4. SPEC_026 General Requirements (contd...)

5. SPEC_031 Fig.1: Dimensions of 11 KV Pin Insulator Fig.2: Dimensions of Strain Insulators

6. SPEC_0310 Fig.5: T&C Strain Insulator Assembly Helical Fig.6: B&S Strain Insulator Assembly Helical

7. SPEC_0311 Fig.7: 11 KV Strain Clamp for Ball & Socket Insulator

8. SPEC_0312 Fig.8: 11 KV Strain Clamp for Tongue & Clevis Insulator

9. SPEC_032 Fig.3: Insulator Pin

10. SPEC_037 Fig.1: Dimensions of 11 KV Pin Insulator Fig.2: Dimensions of Strain Insulators

11. SPEC_038 Fig.3: Insulator Pin

12. SPEC_041 Fig.3: Shackle Insulator Type-1 & Fittings Fig.4: Shackle Insulator Type-1 & Fittings

13. SPEC_051 Aluminium Crimping Pins for Energy Meters (2.55 Amps)

14. SPEC_131 Fig.1: Pins with Steal Heads for 33 KV Insulators Fig.2: Fittings for Ball & Socket type 33 KV Insulator String Fig.3: Assembly Drawing of 3 Disc Insulators

15. SPEC_151 Economical Designs for Prestressed Concreted Poles

16. SPEC_152 D.No.1: Reinforcement Details of 7.5 M/140 Kg Prestressed Concrete Pole




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22. SPEC_211 Fig.1: Guy Strain Insulator (Designation-A) Fig.2: Guy Strain Insulator (Designation-C)

23. SPEC_231 Fig.1: 200 Amps Bimetallic Connector for Distbn.Trnsfrmr.

24. SPEC_241 Economical Designs for Virendeel Poles for 33 kV Lines

25. SPEC_2410 D.No.8: Prestressed Concrete Solid Rectangular Pole (9.0/9.5M W.L.: 400 Kg)

26. SPEC_242 Economical Designs Prestressed Concrete Poles for 33 kV Lines

27. SPEC_243 D.No.1: Prestressed Concrete Virendeel Pole (9.0M/300 Kg)

28. SPEC_244 D.No.2: Prestressed Concrete Virendeel Pole (9.0/400 Kg) for 33 kV Line

29. SPEC_245 D.No.3: Prestressed Concrete Virendeel Pole (9.5/200 Kg) for 33 KV Line

30. SPEC_246 D.No.4: Prestressed Concrete Virendeel Pole (9.5/400 Kg) for 3 kV Line

31. SPEC_247 D.No.5: Prestressed Concrete Prestressed Virendeel Pole (9.5/400 Kg) for 33 kV Line

32. SPEC_248 D.No.6: Prestressed Concrete Solid Rectangular Pole (9.0/9.5M W.L.: 200 Kg)

33. SPEC_249 D.No.7: Pre-stressed Concrete Solid Rectangular Pole (9.0/9.5M W.L.: 300 Kg)

34. SPEC_261 L.T. Multicore Aluminum Cables for Distribution S/S

35. SPEC_262 Types and Sizes of Single Core Cables

36. SPEC_282 2-Core & 4-Core PVC Insulated Cables

37. SPEC_311 Earth Knob for LT Lines

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38. SPEC_342 24V and 110 V NICAD Battery Typical Terminal

39. SPEC_361 Schematic Diagram of Automatic Disconnection Switch for the Distribution Transformer feeding Tubewell Loads

40. SPEC_381 Applications of 11 KV AutoReclosers (33/11 kV S/S)

41. SPEC_401 FRP Cross Arm for 11 kV Overhead Lines with Polymeric Ferrule

42. SPEC_411 Jointing Details of Rectangular Hollow Steel Poles

43. SPEC_421 FRP Cross Arm for 11 kV Overhead Lines with Polymeric Ferrule

44. SPEC_432 11 kV Air Break Switch

45. SPEC_495 HT Bushing Terminal Details for 1 Phase Transformers

46. SPEC_496 LT Bushing Terminal Details for 1 Phase Transformers

47. SPEC_497 General Requirements for HT & LT Busing Terminals for 1 Phase Transformers

48. SPEC_505 Fig.6: LT Bushing Terminal Fig.7: LT Bushing Terminals Details for 1 Phase Trnsfrmrs.

49. SPEC_506 General Requirements for HT & LT Bushing Terminals for 1 Phase Transformers

50. SPEC_507 Fig.8: 200 Amps Bimetallic Connector for Distribution Transformers

51. SPEC_532 Fig.1: Typical Constructional Details of 11 kV Fuse Cut-Out

52. SPEC_533 Fig.2: 11 kV Drop Out Fuse Cutout

53. SPEC_564 HT Bushing Terminal

54. SPEC_565 LT Bushing Terminal

55. SPEC_566 General Requirements for Bushing Terminal for DTs

56. SPEC_567 General Requirements for Bushing Terminal for DTs (...contd)

57. SPEC_571 Danger Plate

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58. SPEC_572 Danger Plate

59. SPEC_631 Cross-sectional Views of HT XLPE Cable

60. SPEC_651 Schematic Diagram of Oil Filter Plant

61. SPEC_682 Block Diagram of LT Switched Capacitor System (6.5 kVA Transformer)

62. SPEC_691 11 kV Automatically Switched Capacitor Bank for 5 MVA Transformer at 33/11 kV S/S

63. SPEC_707 Bushing Terminal for Distribution Transformers

64. SPEC_723 Fig.4: HT Bushing Terminal Fig.5: HT Bushing Terminal Details for 1 Phase Transformers

65. SPEC_724 Fig.6: LT Bushing Terminal Fig.7: LT Bushing Terminal Details for 1 Phase Transformers

66. SPEC_725 General Requirements HT & LT Bushing Terminals for 1 Phase Transformers

67. SPEC_726 Fig.8: 200 Amps Bimetallic Connector for DTs

St-A01-prot-gaurding.gif

ST-A02-clearance-wo-earth.GIF

ST-A03-clearance-with-earth.GIF

ST-A04-support-wo-earth.GIF

ST-A05-support-with-earth.GIF

ST-A06-V-Xarm-MSChannel.GIF

ST-A07-Pole-Top-Bracket.GIF

ST-A08-Permi-Spans-Table.GIF

ST-A09-ACSR_volt-Regltn-Table.GIF

ST-A10-Arrange-Angle-location.GIF

ST-A11-Tapping-Singlepole.GIF

ST-A12-Tapping-1st-structure-lengthspur.GIF

ST-A13-V-Xarm-MSAngle.GIF

St-a14-Booster-Install.gif

ST-A15-Auto-Recloser-Install.GIF

ST-A16-Clearance.GIF

ST-A17-Config-singlephase-nuetral-8m.GIF

ST-A18-Config-singlephase-nuetral-7m.GIF

ST-A19-Tapping-singlephase-from3ph.GIF

ST-A20-Tapping-singleph-from1ph.GIF

ST-A21-Arrange-Tension-Location.GIF

ST-A22-Poles-Angle-Deadend.GIF

ST-A23-Arrange-guy-Angleloc-0-10.GIF

ST-A24-Singlepole-Guys-Angleloc-10-60.GIF

ST-A25-Doublepole-Guys-Angleloc-10-60.GIF

ST-A26-4pole-Guys-Angleloc-60-90.GIF

ST-A27-Doublepole-Guys-Deadend.GIF

ST-A28-Config-singlephase-phase-7.5mpole.GIF

ST-A29-Tapping-singlephase-phase-from3ph-R&B.GIF

ST-A30-Tapping-singlephase-phase-from3ph-Y&R.GIF

ST-A31-Tapping-singlephase-from 1ph.GIF

ST-A32-ACSR-singlephase-phase-volt-regltn-Table.GIF

ST-A33-ACSR-singlephase-nuetral-volt-regltn-table.GIF

ST-A34-AAAC-Permi-spans-revised-table.GIF

ST-A35-AAAC-volt-regltn.GIF

ST-A36-FRP-Top-Hamper-with-Polymericferrule.GIF

st-b01-Prot-guarding-horiz.gif

st-b02-Ptot-guarding-vertical.gif

st-b03-Conductor-Horiz-formation-clearance-3ph5w.gif

st-b04-Conductor-Vertical-Formation-clearance-3ph5w.gif

st-b05-Supports-Horiz-formation.gif

st-b06-Supports-Vertical-Formation.gif

st-b07-pole-Top-Bracket.gif

st-b08-Max-Permi-Spans-3phase.gif

st-b09-AAAC-ACSR-Volt-Regltn-Table.gif

st-b10-Arrange-Angle-Location.gif

st-b11-Max-Permi-Spans-1phase.gif

st-b12-Conductor-Horiz-Formation-Clearance-3ph4w.gif

st-b13-Conductor-Vertical-Formation-Clearance-3ph4w.gif

st-b14-Conductor-Horiz-Formation-Clearance-1ph3w.gif

st-b15-Conductor-Vertical-Formation-Clearance-1ph3w.gif

st-b16-PVC-Spacer.gif

st-b17-Earth-Knob.gif

st-b18-Compositr-Spacer.gif

st-b19-Poles for-Angle-Deadend.gif

st-b20-Guys-Angle-Location-0-10.gif

st-b22--Guys-Angle-Location-30-60.gif

st-b24-Guys-Deadend-Location.gif

st-b25-Guys-3ph5w-Angle-Location-0-10.gif

st-b29-Guys-3ph5w-Deadend-Location.gif

st-b30-Guys-3ph5w-Deadend-Verical.gif

st-b31-Guys-3ph4w-Angle-Dead-Location.gif

st-b36-AAAC-Max-Permi-Span-3ph4w.gif

st-b37-AAAC-Max-Permi-Span-1ph.gif

st-b38-AAAC-volt-Regltn-Table.gif

ST-C1-Insulators-fittings-Pin.GIF

ST-C2-Insulators-T&C fittings.GIF

ST-C3-Straightrun-Holding.GIF

ST-C4-Anglerun-Holding.GIF

ST-C5-Endlocation-Holding.GIF

ST-D1-Pin-Insulator.GIF

ST-D2-Insulator-Fittings-Pin.GIF

ST-D3-Shackle-insulator.GIF

ST-D4-Insulator-Fitting1-Shackletype.GIF

ST-D5-Insulator-Fitting2-Shackletype.GIF

ST-D6-Helically-formed-Fittings.GIF

st-e26-AAAC-ACSR-Cripmed-Tension-Joints.gif

st-e28-LT-Service-Connectors.gif

st-e29-T-Joints-Epoxy.gif

st-e30-HT-Bimetallic-Connectror for-DTR.gif

st-e31-Helicallyfomed-fittings.gif

st-e32-Helically-Formed fittings-T-connectors.gif

st-e33-Helically-formed Fittings-splice-ACSRjoints.gif

st-e34-SuspensionClamp-EyeHooks.gif

st-e35-deadEndClamp-EyeHooks.gif

st-e38-LT-Connectors-NonTension.gif

st-e39-CrimpedJoint-LTServiceConnection.gif

st-e40-LT-ArialBunchedCable-Current-Table.gif

st-f01-DTRStructure-With-DOFuse.jpg

st-f02-DTRStructure-With-ABSwitch&HGFuse.gif

st-f03-DTRStructure-For-OnlineLocation-Along.gif

st-f04-DTRStructure-For-OnlineLocation-Across.gif

st-f05-EarthPits-Location.gif

st-f06-11kV-HGFuse.gif

st-f07-11kV-HGFuse-Mountingdetails.gif

st-f08-LT-MultiCoreCable-For-DTR.gif

st-f09-ABSwitches-CurrentRating-Table.JPG

st-f10-EarthingArrange-For-DTR.gif

st-f11-Auto-Trf.Disconnection-Switch-with-DFOFuse.gif

st-f13-1PhTRF-Arrangement.gif

st-f14-1PhTRF-MountingDetails.gif

st-f15-Formation-3phdist-with-two1phTRF.gif

st-f16-3PhDist-with-6.35kV1PhTRF .gif

st-f17-Auto-TRFDisconnection-Switch.jpg

st-f18-SingleCoreCable-For-DTR-Table.gif

st-f19-1PhDTR_Arrange.jpg

st-f20-DTR25kVA-Mounting.gif

st-g1-Guy-Assembly.gif

st-g2-GuyEnd-Assembly.gif

st-g3-Guy-Single&Double.gif

st-g4-Guy-Fly&Bow.gif

ST-H01-1Ph-InsulatedWire.GIF

ST-H02-1Ph-MeterBoard.GIF

St-h04-3Ph-Industrial-BareWire.gif

st-h05-3Ph-Industrial-InsulatedCable.gif

st-h06--3Ph-Agriculture.gif

ST-H07-3Ph-MeterBoard1.GIF

ST-H08-3Ph-MeterBoard2.GIF

ST-H09-LTCapacitor-ratings&connections.GIF

ST-H10--1Ph-MeterBoard-With-MCB.GIF

ST-H11-3Ph-MeterBoard-With-MCB.GIF

ST-H12-1Ph-MeterBoard-With-PluginMCB.GIF

ST-H13-3Ph-MeterBoard-With-PluginMCB.GIF

st-j1-CoilEarthing.gif

st-j2-Pipe-RodEarthing.gif

st-j3-Crossing-RailwayTrack.gif

st-j4-Crossing-TeleCommunication.gif

st-j5-Crossing-LTPOwerLines.gif

ST-K04-RCC-BasePlate-AnchorPlate.GIF

st-l1-StdLayout-Outdoor.gif

st-l2-Layout-With-11kVindoorSG.gif

st-l3-Metering-Arrange.gif

st-l4-11kvPILCCable-Sizes.gif

st-l5-11kVXLPECable-Sizes.gif

st-l7-stdlaout-LowCost_ss.gif

st-l8-Layout-Unattended-SS.gif

st-m01-V-Xarm.gif

st-m02-Supports-StdLengths-WorkingLoads.gif

st-m03-Conductor-Formation-Clearance.gif

st-m04-pole-Top-Bracket.gif

st-m05-ACSR-volt-regltn-table.gif

st-m06-prot-guard-AcrossRoad.gif

st-m07-arrange-condutor-Angle0-10.gif

st-m10-Tapping-OnsinglePole.gif

st-m11-AAAC-Sizes-revised.gif

st-m12-AAAC-volt-Regltn-table.gif

st-n1-Layout-unattended.gif

ST-P01-Install-SeparateMountedCT-ExternaFuseProtection.gif

ST-P1A.GIF

ST-P2-Install-BuiltinCT-ExternalFuseProtection.GIF

ST-P2A.GIF

ST-P3-Install-SeparateMountedCT-InternalFuseProtection.GIF

ST-P3A.GIF

ST-P4-Install-BuiltinCT-InternalFuseProtection.GIF

ST-P4A.GIF

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SPEC041.JPG

SPEC051.JPG

SPEC131.JPG

SPEC151.JPG

SPEC152.JPG

SPEC153.JPG

SPEC154.JPG

SPEC155.JPG

SPEC156.JPG

SPEC157.JPG

SPEC211.JPG

spec231.GIF

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spec261.GIF

spec262.GIF

SPEC282.GIF

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SPEC311.JPG

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SPEC342.JPG

SPEC361.JPG

SPEC381.JPG

SPEC401.JPG

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SPEC421.GIF

SPEC432.JPG

SPEC495.JPG

SPEC496.JPG

SPEC497.JPG

spec505.gif

spec506.gif

spec507.gif

SPEC532.JPG

SPEC533.JPG

SPEC564.JPG

SPEC565.JPG

SPEC566.JPG

SPEC567.JPG

SPEC571.JPG

SPEC572.JPG

SPEC631.GIF

SPEC651.JPG

SPEC682.JPG

spec507.gif

SPEC532.JPG

SPEC533.JPG

SPEC564.JPG

SPEC565.JPG

SPEC566.JPG

SPEC567.JPG

SPEC571.JPG

SPEC572.JPG

SPEC631.GIF

SPEC651.JPG

SPEC682.JPG

SPEC691.JPG

spec707.jpg

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spec724.gif

spec725.gif

spec726.gif

spec2410.jpg

REC Specification No.37/1984 (Revised 1993)

11 KV AUTOMATIC VOLTAGE BOOSTERS/REGULATORS

FOREWORD

Automatic Voltage Boosters/regulators are now being used in many countries as a tool to improve the power carrying capability of 11 KV Lines. Selective use of these boosters/regulators not only ensure availability of proper voltage to the consumers but also helps in reducing the cost of electrification by increasing the length of 11 KV lines fed from a single 33/11 KV sub-station and thus reducing the number of sub-stations required in the system. Apart from resulting in substantial economy in investment on the infrastructure, the voltage boosters/ regulators help in reducing frequent motor burn-outs due to improved voltage conditions. The standard specification for the voltage booster was first discussed in the 11

th

Standardisation Conference held at New Delhi in September, 84. The Conference recommended the use of auto voltage boosters in the rural electrification system to reduce the cost of electrification and to eliminate damage to the consumers' motors due to low voltage. The voltage boosters, as standardised by REC in its 11th Conference on Standardisation had a provision of only increasing the voltage upto 10% and there was no provision for reducing the voltage. During discussions with some of the SEBs, it was brought out that there is need for increasing the range of stepping up the voltage as in many long feeders, voltage drop of the order of 20-25% is often encountered. This would call for a step up range of at least 15%. It is also seen that during light load period the voltage tends to go up resulting in damage to bulbs etc. To cope with this situation, a small provision of 5% on the 'buck' side is desirable. Keeping these requirements in view, the specification has been revised to provide a choice to the SEBs to select the desired range out of the standard ranges stipulated in the Specification. Apart from this, the rated voltage on load side has been kept as 11250 V instead of 11000 V to ensure better voltages to the consumers. Considering the possibility of load development and to obviate the need for upgrading the equipment at a later date, a standard rating of 100 Amps. only has been specified as against the earlier rating of 50 Amps. and 100 Amps. This will also avoid possibility of overloading and will increase life of the equipment. The revised Specification is issued based on the decisions taken by the 13th Standardisation Conference held on 4th - 6th May, 1993 at New Delhi. 1. SCOPE This specification covers oil-immersed, naturally air cooled (type ON), outdoor type, pole-mounted, 50 Hz, 11 KV voltage boosters/regulators intended for improving voltage regulation in 11 KV lines having excessive voltage variations. These are normally installed mid-way on long/heavily loaded rural 11 KV lines. 2. APPLICABLE STANDARDS Unless otherwise stipulated in this specification, IS:2026 - Power Transformers as amended from time to time shall be applicable.

3. CURRENT RATING The standard continuous current rating shall be 100 A. Note: The equipment is normally installed on 11 KV line at a point where voltage drop is approximately half of the maximum voltage drops on the feeder. The current rating refers to the load current at the point of installation and not at the sub-station. 4. VOLTAGE REGULATION 4.1 The standard automatic voltage regulation will be as follows: i) (-) 10%, (+) 0% (Boost only) ii) (-) 15%, (+) 0% (Boost only) iii) (-) 15%, (+) 5% (Boost & Buck) Note: The purchaser should carefully select the range to suit his requirements depending upon the field conditions and specify only the required range in the tender document. 4.2 The equipment shall provide voltage boost or buck in steps of 2.5% each. The supplier has, however, the option to offer equipment with smaller steps. 4.3 The supplier has the option to supply equipments in single-phase units as per his standard design. The standard voltage regulation as per 4.1 above will apply to both. 5. VOLTAGE LEVEL SETTING 5.1 The equipment shall be designed to give a normal output voltage of 11250 volts on load side terminals. 5.2 Percentage sensitivity for automatic tap change operation shall be 80% of step voltage on either side of the normal voltage of 11250 volts. 6. CONTINUOUS MAXIMUM RATING AND TEMPERATURE RISE The equipment shall comply with appropriate requirements of IS:2026. 7. BASIC IMPULSE INSULATION LEVEL (B.I.L) The equipment shall have BIL of 75 KV. 8. FITTINGS Unless otherwise specified, the following standard fittings shall be provided: a) Rating plate (as per IS:2026) b) Diagram plate c) Two earthing terminals d) Lifting lugs e) Oil level indicator with minimum level marking f) Oil filling hole with cap g) Pressure release device h) Drain-cum-filter valve

9. POWER LOSSES IN 3-PHASE SYSTEM The maximum permissible power losses at highest boost tap are as follows:

3-phase Unit Single phase Units Loss per Unit

Total losses

Sr. No.

Voltage Range

No load loss in Watts

Full load loss in Watts

No. of 1-phase Units reqd.


Load loss in Watts


Full load loss in Watts

i) (-10%)

(+0%) 640 5500 2 320 2750 640 5500

ii) (-15%)

(+0%) 960 8250 3 320 2750 960 8250

iii) (-15%)

(+5%) 960 8250 3 320 2750 960 8250

10. SHORT CIRCUIT CAPABILITY The voltage regulator shall be capable of withstanding rms symmetrical short circuit current of 25 times the rated current for 2 secs. without injury (ANSI C.57.15). 11. TERMINALS The bushing terminals shall be designed to directly receive aluminium/ACSR conductors upto 7/3.55 mm (both vertically and horizontally) through a bolted arrangement (4 bolts) without requiring use of lugs. The terminal arrangement shall be such as to avoid bimetallic corrosion. 12. SURGE ARRESTERS To avoid abnormal voltage stresses due to lightning and switching transients, suitable surge arresters of metal oxide type shall be mounted on the equipment. Use of oil-immersed arresters provided inside the tank is also permissible. 13. TAP CHANGER REQUIREMENT 13.1 The equipment shall have a motor operated tap changer rated for 100A. The operation of the tap changer shall be controlled by voltage sensing device. The tap changer mechanism shall be operated by a single phase motor operating under oil. 13.2 To avoid switching transient conditions an inherent time delay of 30-50 secs. shall be provided for each tap change. 13.3 The equipment shall be self-contained and self-powered. The power for motor and other control mechanism shall be supplied from built-in source. 14. CONTROL UNIT

14.1 The control unit shall be capable of operating the voltage booster/regulator automatically as well as manually. 14.2 The control unit shall be housed in a fully weather-proof cabinet, mounted on the equipment. 14.3 The control unit shall be provided with the following:- i) Auto-Manual selection ii) Testing terminals 15. APPLICATION The boosters/regulators are intended for installation on the 11 KV lines at a suitable distance from the sub-station to correct tail-end voltage thereby increasing the KW-KM capability of the lines and allowing longer distance to be fed from the sub-station. In the case of single-phase equipment two or three units shall be used to get the desired voltage range (see clause 9). Only one unit will be required in case of 3-phase equipment. 16. The following tests shall be made in accordance with IS:2026: 16.1 Type Tests a) Measurement of winding resistance b) Measurement of voltage ratio on all taps c) Measurement of no load loss and no load current and load loss d) Measurement of Insulation resistance e) Induced over voltage withstand test f) Separate source voltage withstand test g) Tests on tap changer to the extent applicable h) Lightning impulse test i) Temperature rise j) Short circuit test to prove the requirement of clause 10 16.2 Routine Tests a) Measurement of winding resistance b) Measurement of voltage ratio on all taps c) Measurement of no load loss, no load current and load loss d) Measurement of insulation resistance e) Induced over voltage withstand test f) Separate source voltage withstand test g) Test on tap changer to the extent applicable If records of a type test on a voltage booster/regulator which in essential details is representative of the one being purchased, are furnished, the purchaser may accept this as evidence of the type test instead of the actual test. 17. INSPECTION 17.1 All tests and inspection shall be made at the place of manufacture unless otherwise specially agreed upon by the manufacturer and purchaser at the time of purchase. The manufacturer shall afford the inspector representing the purchaser all reasonable facilities, without charge to satisfy him that the material is being furnished in accordance with this specification.

17.2 The purchaser has the right to have the tests carried out at his own cost by an independent agency whenever there is dispute regarding the quality of supply.

11KV AIR BREAK SWITCHES

FOREWORD 11 KV Air Break Switches are extensively used in the 11 KV network on locations such as distribution transformer sub-station, sectionalising / tapping points of 11 KV lines etc. However, the quality of this equipment is invariably not up to the mark. In many cases, the requisite electrical and mechanical requirements are not met with and the switches develop mechanical defects and sparking due to loose contacts after only a few months of operation. Continuous sparking not only causes unnecessary power losses but also sends surges through the transformers which can be one of the causes of pre-mature failure of transformers. Poor contacts also lead to single phasing conditions resulting in damage to consumers' motors. This specification for 11 KV Air Break Switches takes into account the latest advances in technology as also certain stringent requirements laid down in the new IS:9920 (Pts. I to IV). In formulating this I.S., it was recognised that the AB switches, even though meant for off-load operation, are required to be assigned certain minimum making and breaking current ratings in addition to short-circuit current carrying capability. This specification is being issued on the basis of the recommendations of the 12th Standardisation Conference held in July,1987. The specification not only stipulates important electrical and mechanical characteristics but also describes essential constructional features to ensure proper quality of the equipment. 1. SCOPE This specification covers 11KV, 50Hz Air Break Switches for outdoor installation. The switches are suitable for operation under off-load conditions only and are intended for use on Distribution sub- stations and tapping/sectionalising points of 11KV lines. 2. APPLICABLE STANDARD Unless otherwise stipulated in this specification , the AB switches shall conform to IS:9920 (Pt.I to IV). 3. RATED VOLTAGE

The rated voltage shall be 12 KV. 4. RATED NORMAL CURRENT

The rated normal current shall be 400 Amps. 5. RATED LIGHTNING IMPULSE WITHSTAND VOLTAGE KV (PEAK)

i) To earth and between poles 75 KV ii) Across the terminals of open switch 85 KV

6. RATED ONE-MINUTE POWER FREQUENCY WITHSTAND VOLTAGE KV (rms)

i) To earth and between poles 28 KV ii) Across the terminals of open switch 32 KV Note : The withstand values in Clauses 5 & 6 shall apply at the standard reference atmosphere (temperature, pressure and humidity) specified in IS:2071 (part-I)-1974.

7. TEMPERATURE RISE The temperature rise shall not exceed the maximum limits specified below :

Temperature rise limit at Ambient temperature not exceeding 40oC

Copper contacts (Silverfaced) in air = 65oC Terminals of the switch intended to be connect to external conductors by bolts

= 50oC

8. RATED SHORT TIME CURRENT

The rated short time current shall be 16 KA. 9. RATED PEAK WITHSTAND CURRENT

The value of peak current that the switch can withstand in the closed position shall be 40 KA.

10. RATED MAINLY ACTIVE LOAD BREAKING CAPACITY

The rated mainly active load breaking capacity shall be 10A. 11. RATED TRANSFORMER OFF-LOAD BREAKING CAPACITY

The rated transformer off-load breaking capacity shall be 6.3A (rms). 12. RATED LINE CHARGING BREAKING CAPACITY

The rated line-charging breaking capacity shall be 2.5 A (rms) 13 .RATED CABLE-CHARGING BREAKING CAPACITY

The rated cable charging breaking capacity shall be 10 A(rms). 14. CONSTRUCTIONAL FEATURES

14.1 The AB switch shall have triple-pole construction and shall be suitable for horizontal or vertical mounting as required by the purchaser. The switch shall have two 11 KV post insulators per phase suitably mounted on angle irons to enable easy movement of insulators. The angle supports shall be mounted on a 70mm2 hollow beam suitable for fixing on the double pole structure. Alternatively, the angles shall be mounted on a steel frame made of two angle/channel supports. The

switch shall be manually operated with a rocking type arrangement through a 30mm2 G.I coupling rod. 14.2 All current carrying parts shall be made of silver or nickle-plated 90% elecrtrolytic copper. The arcing horns shall be made of phosphor bronze and shall have spring-assisted operation. The switch shall have a spring mechanism so as to ensure that the speed of opening of contacts is independent of the speed of manual operation. 14.3 The spacing between the phases shall be adjustable between 600mm to 760mm. Total length of the square beam/base frame shall be kept as 2650mm. The switch assembly shall be suitable for mounting on a H-pole structure with centre-to-centre distance between poles upto 2440mm. 14.4 The vertical operating rod shall comprise of 25mm (nominal bore) Galvanised steel tube (medium class) as per IS:1161-1979. Length of the operating tube shall vary from 4800mm to 6000mm depending upon the mounting position of the switch on the structure (exact length to be specified by the purchaser). 14.5 Suitable arrangement shall be provided to pad-lock the operating handle in 'ON' and 'OFF' positions. 14.6 The switch shall be provided with bimetallic connectors on the incoming side to accommodate ACSR of sizes 20, 30 and 50mm2. On the outgoing side, about 1 metre long flexible coil type cable jumper of not less than 50mm2 aluminium section shall be provided. 14.7 All iron parts shall be hot dip galvanised. The tubes shall be galvanised in accordance with IS:4736-1968. 14.8 Typical constructional details of the AB Switch are shown in the enclosed drawing.

15. TYPE TESTS

The AB Switch shall be subjected to the following type tests in accordance with IS:9920.

i) Dielectric test (impulse and one minute wet power frequency withstand voltage tests) ii) Temperature rise test (for contacts and terminals) iii) Short time current and peak withstand current tests iv) Mainly active load breaking capacity test v) Transformer off-load breaking capacity test vi) Line charging breaking capacity test vii) Cable charging breaking capacity test viii) Operation and Mechanical Endurance test

16. ROUTINE TESTS

The AB Switches shall be subjected to the following routine tests: i) Power frequency voltage dry test ii) Measurement of the resistance of main circuit

iii) Operating test

17. INSPECTION 17.1 All tests and inspection shall be made at the place of manufacture unless otherwise especially agreed upon by the manufacturer and purchaser at the time of purchase. The manufacturer shall afford the inspector representing the purchaser all reasonable facilities without charge, to satisfy him that the material is being furnished in accordance with this specification. 17.2 The purchaser has the right to have the tests carried out at his own cost by an independent agency whenever there is dispute regarding the quality of supply.

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