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Section 4 Transmission: Spacer & Spacer DampersTable of Contents
Helical Rod Spacer ..................................................................................4-2
CUSHION-GRIP Twin Spacer ................................................................4-4
CUSHION-GRIP Spacer Damper ..........................................................4-5
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Helical Rod Spacer
4-2
NOMENCLATURE
GENERAL RECOMMENDATIONS
Intended Use: The HELICAL ROD Spacer is recommendedfor use on horizontal , twin conductor bundles.
The functions of the HELICAL ROD Spacer are: to provideuniform spacing of horizontally bundled subconductors,to insure consistent electrical characteristics; to minimizewind induced motions such as subconductor oscillation andaeolian vibration so that no conductor damage results; tokeep the subconductors from entangling due to galloping,ice unloading, and fault currents.
Materials: The standard HELICAL ROD Spacer for aluminumbased conductors is constructed entirely of high strengthaluminum alloy wire formed into helical rods. There are noloose parts or troublesome articulated joints to create radionoise through looseness. To avoid galvanic corrosion spacerrod material is always designed to be compatible with theconductor. Materials other than aluminum are available forspecial application to copper based conductor and galva-nized steel wire.
RIV-Corona: Helical Spacers are designed to be corona-free at voltages 10-20% above operating up to 500 kV ACand 750 kV DC.
Installation and Inspection: The spacer is applied easilyand uniformly without tools and can be installed with hot linetools. It is a simple matter to inspect for proper applicationfrom the ground since there are no bolts that need specialtorquing during installation.
Fault Currents: The HELICAL ROD Spacer is designed tomeet fault current requirements developed in most EHV linedesign. For special situations the fault current capacity of thestandard 4-rod helical spacer can be increased by addingadditional rods and/or increasing rod diameter. Completefault current testing and analysis has been completed forthe HELICAL ROD Spacer and is published in AIEE paperDP 58-779, and IEEE paper 63-88.
Spacer Placement: As a result of experimental work doneon some of the early EHV lines, the normal distance betweenHELICAL ROD Spacers should not exceed 250-ft. However,in some geographical areas exposed to constant high windsand heavy ice accumulation, experience suggests that thespacing should be shortened in order to stabilize the con-ductor bundle. Results of laboratory and eld experimentsindicate that one of the most effective methods to reducesubconductor oscillation and increase bundle stability is byreducing subspan lengths and placing spacers in a non-symmetrical pattern. Asymmetric spacing detunes the entirespacer-conductor system and thereby reduces the incidenceof sympathetic vibration between subspans.
Specic recommendations for spacer design and spacerplacement should be predicated on an evaluation of theelectrical characteristics, the line design parameters, andthe environmental conditions. Through your representative,PLP will help determine the most suitable spacer designand placement pattern for your line conditions.
Thermal Rating (Continuous) 125C
Approx. Applied Length
Alluminum Alloy Rods
18" Subconductor Spacing(Consult PLP for other spacing)
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4
Helical Rod Spacer Twin-18"
For use on:ACSR, Aluminum Alloy
All-Aluminum, AWAC Compacted All-AluminumCompacted ACSR
Right-hand lay standard
EXPLANATORY NOTES:
(1) Typical Conductor Size indicates one of various conductors within each range.(2) Design for conductors below .800" diameter available upon request.(3) Designs for other spacing and conductor materials available upon request.(4) AWAC and Copperweld are registered trademarks of the Copperweld Co.
Catalog Number
Diameter Range (Inches)Typical
Conductor Size
ApproximateApplied Length
(Inches) Color CodeMin. Max.
SU-MS-7424 .800 .835 397.5, 30/7 35 Purple
SU-MS-3352 .836 .868 477, 26/7 35 Blue
SU-MS-7425 .869 .910 477, 30/7 35 Green
SU-MS-3540 .911 .950 556.5, 26/7 44 BlackSU-MS-5423 .951 .994 715.5, 37-61W, All Alum. 44 Brown
SU-MS-7426 .995 1.038 666.6, 24/7 45 Orange
SU-MS-5504 1.039 1.088 795, 45/7 45 Blue
SU-MS-1245 1.089 1.140 795, 26/7 45 Yellow
SU-MS-3850 1.141 1.196 954, 54/7 46 Orange
SU-MS-6070 1.197 1.250 1113, 61W, All Alum. 46 Purple
SU-MS-5276 1.251 1.305 1272, 61W, All Alum. 46 Green
SU-MS-5519 1.306 1.365 1272, 45/7 48 Yellow
SU-MS-7228 1.366 1.425 1272, 54/19 48 Black
SU-MS-5285 1.426 1.492 1431, 54/19 49 Brown
SU-MS-4397 1.493 1.562 1590, 54/19 49 Red
SU-MS-5056 1.563 1.619 1780, 84/19 50 Green
SU-MS-4767 1.620 1.678 2000, 72/7 50 Yellow
SU-MS-5462 1.679 1.731 2250, 91W, All Alum. 50 Brown
SU-MS-4656 1.732 1.795 2156, 84/19 50 Orange
SU-MS-3807 1.796 1.855 2500, 91W, All Alum. 50 Red
SU-MS-6183 1.856 1.923 2750, 91W, All Alum. 50 Blue
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GENERAL INFORMATION
The CUSHION-GRIP Twin Spacer is simple to install andis shipped fully assembled (no loose parts).
The break-away bolt provides a clear indication that theproper installation torque has been achieved (no specialtools required).
Conductor Spacing is 18 inches (457 mm), but also availablein 13 inch (330 mm) spacing.
CatalogNumber
DiameterRange
Min. Max.
CGTS-0101 0.673 0.713
CGTS-0102 0.714 0.752CGTS-0103 0.753 0.791
CGTS-0104 0.792 0.831
CGTS-0105 0.832 0.870
CGTS-0106 0.871 0.909
CGTS-0107 0.910 0.949
CGTS-0108 0.950 0.988
CGTS-0109 0.989 1.028
CGTS-0110 1.029 1.067
CGTS-0111 1.068 1.106
CGTS-0112 1.107 1.146
CGTS-0113 1.147 1.185
CGTS-0114 1.186 1.224
CGTS-0115 1.225 1.264
CGTS-0116 1.265 1.303
CGTS-0117 1.304 1.345
CGTS-0118 1.346 1.382
CGTS-0119 1.383 1.421
CGTS-0120 1.422 1.461
CGTS-0121 1.462 1.500
CGTS-0122 1.501 1.539
CGTS-0123 1.540 1.579
CGTS-0124 1.580 1.618
CGTS-0125 1.619 1.657
CGTS-0126 1.658 1.697
CGTS-0127 1.698 1.736
CGTS-0128 1.737 1.776
CGTS-0129 1.777 1.821
Thermal RatingStandard 125C
HT Version 200C
CUSHION-GRIP Twin Spacer
Two versions of the CUSHION-GRIP Twin Spacer are avail-able. The standard version is designed for up to 125C; 150for 2 hour emergency conductor operation and the hightemperature (HT) version can be used for applications withconductor operating temperatures up to 200C; 225 for 2hour emergency.
Notes: For high temperature (HT) version add HT to the catalognumber (Example: CGTS - 0112HT).
For 13 inch spacing add -13 to catalog number (Example:CGTS - 0112HT - 13).
CUSHION-GRIP Twin Spacer for T2 or VR conductors
Catalog Number Conductor Size
CGTS-T2266 Partridge
CGTS-T2336 Linnet
CGTS-T2397 Ibis
CGTS-T2477 Hawk
For 13 inch spacing add -13 to catalog number (Example:CGTS - T2266 - 13).
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CUSHION-GRIP Spacer Damper (Type B & Type C)
GENERAL INFORMATION
NOMENCLATURE
The CUSHION-GRIP Spacer Dampers for Twin, Tri,Quad and Hex Bundles feature elastomer dampingelements engineered to absorb maximum energy.This design provides the greatest possible resis-tance to conductor fatigue by eliminating the need foradditional vibration dampers.
UNIQUE DESIGNSThe Type B design was developed in cooperation with theEngineering Team at PLP-Brazil to meet the demandingrequirements of IEC Specication 61854, while maintaininga light overall weight and exceptional performance.
The Type C design was developed in conjuction with PLP-Great Britain to exceed the extremely difficult performancerequirements established by the National Grid Companyin the early 1990s. As such, this design is heavier and
more robust and is well suited for areas where traditionalspacer dampers have experienced premature performanceproblems or failures.
PATENTED DAMPING ELEMENTSBoth the Type B and Type C designs employ uniquedamping elements which are captured in a way which as-sures the elastomer is always in compression, providingmaximum service life.
FIELD PROVENBoth spacer damper designs have been used extensivelythroughout Europe and Brazil since their introduction inthe early 1990s.
CLAMP FASTENER ASSURES PROPERINSTALLATIONA high strength 1/4 turn fastener is employed in theelastomer lined conductor clamp to insure properinstallation. This design provides consistent compression ofthe elastomer liners without relying on specic bolt torquevalues or bolts with break-away heads.
PLACEMENT IS THE KEY TO PERFORMANCEPLPs extensive experience and laboratory and eld testingallow us to provide you with placement recommendationsthat will minimize the motion of conductor bundles and
maximize the longevity of the Spacer Damper.
CGSD3-0122
TogglePin
Keeper
Frame
Elastomer Inserts
Arm
Thermal RatingStandard: 125C
HT Version: 200C
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ORDERING INFORMATION
For standard 18" (457mm) sub-conductor spacing thecatalog numbers are:
CGSDT-X45YZWhere T is B for Type B or C for Type CYZ is taken from the conductor range table belowX is 2 for Twin, 3 for Tri, 4 for Quad, 6 for Hex
Example:CGSDB-34529 is a Type B Spacer Damper for a Tri Bundleof conductors within a diameter range of 1.107" to 1.146"(28-29 mm).
Note: For high temperature (HT) version add HT to thecatalog number (Example CGSDB-34529HT).
YZ Conductor Range Inches (mm)
18 0.673-0.713 (17-18)
19 0.714-0.752 (18-19)
20 0.753-0.791 (19-20)
21 0.792-0.831 (20-21)
22 0.832-0.870 (21-22)
23 0.871-0.909 (22-23)
24 0.910-0.949 (23-24)
25 0.950-0.988 (24-25)
26 0.989-1.028 (25-26)
27 1.029-1.067 (26-27)
28 1.068-1.106 (27-28)
29 1.107-1.146 (28-29)
30 1.147-1.185 (29-30)
31 1.186-1.224 (30-31)
YZ Conductor Range Inches (mm)
32 1.225-1.264 (31-32)
33 1.265-1.303 (32-33)
34 1.304-1.345 (33-34)
35 1.346-1.382 (34-35)
36 1.383-1.421 (35-36)
37 1.422-1.461 (36-37)
38 1.462-1.500 (37-38)
39 1.501-1.539 (38-39)
40 1.540-1.579 (39-40)
41 1.580-1.618 (40-41)
42 1.619-1.657 (41-42)
43 1.658-1.697 (42-43)
44 1.698-1.736 (43-44)
45 1.737-1.776 (44-45)
46 1.777-1.821 (45-46)Contact PLP for other sub-conductor spacingsand congurations.
CatalogNumber Description
00071004 CUSHION-GRIP Spacer Damperinstallation tool
CUSHION-GRIP Spacer Damper (Type B & Type C)
Type "B"
Type "C"
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