Electricity pylons Hydro-Québec's electricity transmission system

two types of single-circuit 735 kv delta pylons near saint-jean-sur-richelieu paralleled dual-circuit 315 kv line. center 735 kv line uses larger version delta pylon while 1 right uses smaller one.

hydro-québec transÉnergie uses several different types of electricity pylons support 735 kv power lines. of them single-circuit, meaning each pylon carries 1 power line 3 bundles of 4 electrical subconductors separated spacers, each bundle transmitting 1 phase of current.

a series of v-guyed towers, near chapais, quebec.

the earliest type of tower used massive self-supporting delta pylon, or waist pylon, consumed 21 tonnes of steel per kilometre of line. type of pylon used first 735 kv power line manic-outardes power stations load centre of montreal. there 2 significant variations of delta pylon; 1 has longer side crossbars such 3 bundles of conductors suspended on v-shaped insulators. other has shorter side crossbars, such 2 outside bundles hung on vertical insulator string , middle bundle hung v-shaped insulator.

over years, hydro-québec researchers engineered new type of pylon, v-guyed tower, reduced materials consumption 11.8 tonnes of steel per kilometre of power line. type of tower includes variation longer side crossbars, conductors hung v-shaped insulator , 1 shorter side crossbar, middle bundle hangs insulator , side bundles strung on vertical insulator strings.

during construction of james bay transmission system, cross-rope suspension tower invented. type of tower features 2 guyed-tower legs similar v-guyed tower, 2 legs don t converge @ tower base. in case of cross-rope suspension tower, tower legs spread apart on 2 different foundations. in addition, crossbar replaced series of suspension cables 3 vertical insulator strings support 3 bundles, allows design consume 6.3 tonnes of steel per kilometre of line. design known chainette (little necklace).

transÉnergie uses two-level pylons angle towers or structures on 735 kv power lines change direction of line or switch position of conductor bundles. delta pylons , three-leg guyed towers used angle towers; referred penguins hydro-québec linemen.

pylons other voltage levels

hydro-québec transÉnergie uses combination of double-circuit three-level pylons , single-circuit delta pylons suspend electrical conductors of other voltages, such 315 kv. ±450 kv high-voltage direct current line in hydro-québec s power grid uses t-shaped tower, lattice or pole, support 2 bundles of 3 conductors on each side. direct current power line uses 2 poles or wider, pyramidal, self-supporting lattice structure angle towers.

174.6 metre pylon adjacent hydro-québec s now-decommissioned tracy power plant.



other pylons

hydro-québec uses tall, large pylons cross large bodies of water, lakes , rivers. these towers said prominent , tallest pylon in hydro-québec s power grid of function. tallest of these located near tracy power station on shore of saint lawrence river, carrying 735kv circuit between lanoraie , tracy. pylon, largest of kind in canada, 174.6 metres (572.8 ft) tall, same height montreal olympic stadium, , larger washington monument in united states (555 feet (169.2 m)).

pylon strength

the pylons , conductors designed handle 45 millimetres (1.8 inches) of ice accumulation without failure, since hydro-québec raised standards in response ice storms in ottawa in december 1986 , montreal in february 1961, left 30 40 millimetres (1.2 1.6 inches) of ice. has led belief hydro-québec transÉnergie s electrical pylons indestructible . despite being more 3 times higher canadian standard of 13 millimetres (0.51 inches) of ice tolerance, ice storm in late-1990s deposited 70 millimetres (2.8 inches) of ice.