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)
1
S.No.
Drawing No.
Description
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
2
S.No.
Drawing No.
Description
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
21.
B-21
LT Line Arrangement of Guys for 100 to 600 Angle Loc
22.
B-22
LT Line Arrangement of Guys for 100 to 600 Angle Loc
23.
B-23
LT Line Arrangement of Guys for 600 to 900 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
26.
B-26
3 - 5 W Line – Arrangement of Guys for 100 to 300
3
S.No.
Drawing No.
Description
27.
B-27
3 - 5 W Line – Arrangement of Guys for 300 to 600
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
34.
B-38
- Permissible Span with A.A.A Conductor (Table) for 1 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
4
S.No.
Drawing No.
Description
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
5
S.No.
Drawing No.
Description
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
6
S.No.
Drawing No.
Description
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.
K–4
R.C.C. Base / Ancher Plate
Series – L : 33 / 11 KV Sub-Station 1.
L–1
33/11 KV Sub-Station – Standard Layout (Outdoor)
2.
L–2
33/11 KV Sub-Station – Indoor 11 KV Switchgear
3.
L –3
33/11 KV Sub-Station – Metering Arrangement
4.
L–4
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
S.No.
Drawing No.
Description
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)
7
S.No.
Drawing No.
Description
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.
S.No.
Drawing No.
Description
B: REC SPECIFICATIONS 1.
SPEC_023
HT Bushing Terminal
8
S.No.
Drawing No.
Description
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 (2.5–5 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
17.
SPEC_153
D.No.2: Reinforcement Details of 7.5 M/200 Kg Prestressed Concrete Pole
18.
SPEC_154
D.No.3: Reinforcement Details of 8.0 M/140 Kg Prestressed Concrete Pole
19.
SPEC_155
D.No.4: Reinforcement Details of 8.0 M/200 Kg Prestressed Concrete Pole
9
S.No.
Drawing No.
Description
20.
SPEC_156
D.No.5: Reinforcement Details of 9.0 M/140 Kg Prestressed Concrete Pole
21.
SPEC_157
D.No.6: Reinforcement Details of 9.0 M/200 Kg Prestressed Concrete Pole
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
10
S.No.
Drawing No.
Description
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 Auto–Reclosers (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
11
S.No.
Drawing No.
Description
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
12
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
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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
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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
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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-b21-Guys-Angle-Location-10-30.gif
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st-b23-Guys-Angle-Location-60-90.gif
st-b24-Guys-Deadend-Location.gif
st-b25-Guys-3ph5w-Angle-Location-0-10.gif
st-b26-Guys-3ph5w-Angle-Location-10-30.gif
st-b27-Guys-3ph5w-Angle-Location-30-60.gif
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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
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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 substation 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. th
The standard specification for the voltage booster was first discussed in the 11 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, polemounted, 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. 4.1 i) ii) iii)
VOLTAGE REGULATION The standard automatic voltage regulation will be as follows: (-) 10%, (+) 0% (Boost only) (-) 15%, (+) 0% (Boost only) (-) 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. a) b) c) d) e) f) g) h)
FITTINGS Unless otherwise specified, the following standard fittings shall be provided: Rating plate (as per IS:2026) Diagram plate Two earthing terminals Lifting lugs Oil level indicator with minimum level marking Oil filling hole with cap Pressure release device Drain-cum-filter valve
9.
Sr. No .
POWER LOSSES IN 3-PHASE SYSTEM The maximum permissible power losses at highest boost tap are as follows:
Voltage Range
3-phase Unit No load loss in Watt s
Full load loss in Watt s
No. of 1phas e Unit s reqd.
Single phase Units Loss per Unit
Total losses
No load loss in Watt s
Load loss in Watt s
No load loss in Watt s
Full load loss in Watt s
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 i) ii)
The control unit shall be provided with the following:Auto-Manual selection 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 singlephase 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. 16.1 a) b) c) d) e) f) g) h) i) j)
The following tests shall be made in accordance with IS:2026: Type Tests Measurement of winding resistance Measurement of voltage ratio on all taps Measurement of no load loss and no load current and load loss Measurement of Insulation resistance Induced over voltage withstand test Separate source voltage withstand test Tests on tap changer to the extent applicable Lightning impulse test Temperature rise Short circuit test to prove the requirement of clause 10
16.2 a) b) c) d) e) f) g)
Routine Tests Measurement of winding resistance Measurement of voltage ratio on all taps Measurement of no load loss, no load current and load loss Measurement of insulation resistance Induced over voltage withstand test Separate source voltage withstand test 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. 2 The angle supports shall be mounted on a 70mm 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 2 through a 30mm G.I coupling rod. 14.2 All current carrying parts shall be made of silver or nickleplated 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 2 of not less than 50mm 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) 17.
Operating test
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.
