What is a catenary cable?
What is a catenary cable?
catenary, in mathematics, a curve that describes the shape of a flexible hanging chain or cable—the name derives from the Latin catenaria (“chain”). Any freely hanging cable or string assumes this shape, also called a chainette, if the body is of uniform mass per unit of length and is acted upon solely by gravity.
What is the difference between the catenary and contact wire?
Catenary wires are used to hold the contact wire in a straight line. Contact wires are used to transmit power to a pantograph of a locomotive.
What are the different types of catenary system?
TYPES OF OVERHEAD CATENARY SYSTEM 1. Simple Catenary 2. Compound Catenary 3. Stitched Catenary 4.
How high does a catenary wire need to be?
OSG and it says it needs to be at least 3.5m off the ground. Thanks both. Have re-checked regs – 3.5m is for any span not subject to vehicular traffic.
What is the purpose of catenary?
In our world, a catenary is a system of overhead wires used to supply electricity to a locomotive, streetcar, or light rail vehicle which is equipped with a pantograph. The pantagraph presses against the underside of the lowest overhead wire, the contact wire.
What are catenary used for?
A catenary can also be called alysoid or chainette. In architecture and engineering, catenaries are used in bridge and arch design to avoid bending moments. The catenary is also regarded as the ideal shape for an arch that is free-standing and of constant thickness.
Does catenary wire carry current?
This catenary wire (also called a messenger wire) has closely spaced “drops,” which support the actual contact, current-carrying wire. The return path for the current is the track rail, which is at ground potential and thus not electrically dangerous.
What is the material used for catenary?
The catenary wire is made of copper or copper alloys of 70, 120 or 150 mm2. The smaller cross sections are made of 19 strands, whereas the bigger has 37 strands.
How do catenary wires work?
The catenary or messenger wire is hung at a specific tension between line structures, and a second wire is held in tension by the messenger wire, attached to it at frequent intervals by clamps and connecting wires known as droppers.
What is a catenary structure?
In physics or geometry, a cable or a chain hanging freely and acting under its own weight, supported only at its end points (not in a vertical line) and with no other load, takes the form of a catenary. This is different to the loaded cables supporting a suspension bridge, which take the form of a parabola.
What is catenary wire made of?
The Catenary wire comprises 19 strands of cadmium copper, each strand of 2.10 mm dia, with overall dia of 10.5 mm having about 80% conductivity and 65 sq. mm cross-sectional area. The contact wire is a solid hard drawn grooved electrolytic.
What is catenary cable?
Catenary refers to the cables and wires that hang over electrified rail-lines. ‘Catenary’ is a mathematical word that describes the curve created when two masts support a cable; if the cable is not taut, the cable hangs in a ‘valley-like’ curve.
Where can I find media related to catenary?
Wikimedia Commons has media related to Catenary. Wikisource has the text of the 1911 Encyclopædia Britannica article ” Catenary “. Catenary at PlanetMath. The Catenary – Chains, Arches, and Soap Films.
What are the properties of catenary curves?
The catenary is the only plane curve other than a horizontal line with this property. Also, the geometric centroid of the area under a stretch of catenary is the midpoint of the perpendicular segment connecting the centroid of the curve itself and the x -axis.
What is the catenary profile of a suspension bridge?
The profile of the cable of a real suspension bridge with the same span and sag lies between the two curves. The catenary and parabola equations are respectively, y = cosh (x) and y =x2 A heavy anchor chain forms a catenary, with a low angle of pull on the anchor. The catenary produced by gravity provides an advantage to heavy anchor rodes.
