Insulated Cross Arms to Raise Conductor Height
INSULATED CROSS-ARMS TO RAISE CONDUCTOR HEIGHT
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The transmission line network in India is huge and lines of different kV ratings have been laid as per need of the power at the time of construction. Subsequently the need for power is increasing and there is a need to transmit more power in the same corridor. However, development of overhead power infrastructure faces key challenges these days from the perspectives of cost as well as Right of way (ROW) objections by a public that has grown wary of transmission lines.?
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With more and more of urbanization, Transmission lines that were generally out of city boundaries are now inclusive. Needs of Infrastructure developments in such regions necessitates raising of existing conductors for maintaining necessary clearances at Road, Bridges, Bullet Train, Metro Rail, High speed corridor crossings.?
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A compact line with insulated cross-arms is now seen as necessary to promote public acceptance and facilitate obtaining the necessary permits.
Long Rod Porcelain Insulators as insulating cross-arms have been developed as part of a multi-year research and test program. These are intended to replace steel crossarms and suspended vertical insulator strings on traditional lattice towers, thereby enabling conductors to be attached directly to the cross-arm.?
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?The mounting arrangements developed in which existing tower cage shall be fitted with thicker metallic strips. Hinge clamp shall be mounted on the same. Porcelain Long Rod shall be connected to these clamps using clevis type end fittings. At another end yoke plate shall be used to connect horizontal and inclined members of Insulators.
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How much conductor can be lifted by using Cross Arms?
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Depending on the length of the insulators, roughly it would go up by:
66 kV - 870 mm
132 kV - 1260 mm
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220 kV - 2050 mm?
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Among the key benefits of PLRI cross-arms is that insulator swing under windy conditions is reduced to a minimum and instead determined by metal clamping assemblies. There is also no requirement for additional tower height to accommodate the length of the insulator string itself. Therefore, using PLRI cross-arms can effectively raise heights of conductors by this same distance.
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Basically, such a solution can:
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?1. Resolve ground clearance problems on existing lines
?2. Allow greater sag on existing or new conductors, critical to improving power transfer capacity since it enables conductors to run at highest rated temperatures while still not infringing ground clearances?
3. Facilitate voltage upgrading due to improved clearances from towers, especially since risk of blow out is mitigated What is life of such arrangement? This arrangement consists of Insulator and Hardware.?
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This is most cost-effective solution which will also last longer.
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(D.P.K. Udas)
Power Professional
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