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When single core cables laid in trefoil formation what clamping materials should be used?
I am assuming you are referring to high voltage cables. These clamps must be designed to withstand the large electromagnetic forces that result during a short circuit. This is their main purpose. The electromagnetic forces can be simplified as an impulse. The impulse (of duration ~0.2s I believe) causes the core of a cable to accelerate within the elastic region of the clamp and insulation material until these materials are stretched sufficiently to provide an equal and opposite reaction force. Upon reaching this "equilibrium" position, the core and insulation will have acquired a certain amount of kinetic energy such that in the absence of any damping effects they will continue to move within the elastic regionof the clamp and insulation until a reaction force equal to twice the magnitude of the impulse is reached.
So we need a material with a high yield strength to resist this large force without plastic deformation.
In short, materials that have been proven suitable for this use are: Aluminium alloy LM25 which offers a good level of corrosion resistance. In situations where exceptional corrosion resistance is needed, Polyamide 6/66 with glass reinforcement (30% fibre should be acceptable) and PET with glass reinforcement (30%) have had proven success. Note that with its higher yield strength the polyamide is the better choice of the two composite materials. Polyamide in general is vulnerable to UV light, this problem can be solved by either coating the clamps or using a UV resistant blend.
What else can I help you with?
Can you trefoil same phase cables?
can do trefoil to the same phase cables
Why trefoil formation for single core cable?
Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimised and hence the circulating currents.The circulating currents cause localised heating.
Which kind of cable are used in hvdc transmission system?
In HVDC (High Voltage Direct Current) transmission systems, the primary types of cables used are underground cables and submarine cables. These cables are typically made from materials like cross-linked polyethylene (XLPE) or oil-filled cables, designed to withstand high voltage and environmental conditions. They are insulated to prevent electrical leakage and ensure safe transmission over long distances. Additionally, the use of bipolar cables allows for efficient transmission and improved reliability in the system.
Can Aluminum mylar-tape-shielded cables be used instead of Copper braid-shielded cables for instrumentation cables?
Actually, aluminum mylar tape shielded cables are better than copper braid shielded cables for instrumentation cables.
What are cable stayed bridges made of?
The primary building materials in cable-stayed bridges are steel, which is used in the cables and also as the reinforcing material in the concrete, which is the other primary building material.
Can you trefoil same phase cables?
can do trefoil to the same phase cables
Why trefoil formation for single core cable?
Voltages are induced in the sheath of cables running in parallel which result in circulating currents flowing in the sheaths. The distances between single core cables running in parallel determine the voltages induced. With single core cables in trefoil formation (touching each other) the distances between the cables are minimum and thus the voltages induced are minimised and hence the circulating currents.The circulating currents cause localised heating.
When you clamp a single core cable carrying about 500A with an aluminum cable clamp do you have to take care of any effects due to Eddy currents and If so what can you do to minimise these effects.?
Assuming the single core cable forms part of a three phase circuit (i.e. you are clamping three single core cables) it is best to install the three cables close togther in what is called "trefoil" formation. This harmonises the Eddy currents of each phase.
How are Monster HDMI cables cables better than standard HDMI cables?
They use higher quality materials.
What materials are in a cable-stayed bridge?
Well a tube and cables
What materials are used for a cable stayed bridge?
steel concrete cables
What are the materials of elasticity?
steel cables, rubber bands, springs and lycra clothes
What are the best practices for installing and maintaining outdoor cables?
The best practices for installing and maintaining outdoor cables include proper planning, using high-quality materials, burying cables at the correct depth, protecting cables from environmental factors, and regularly inspecting and maintaining the cables to prevent damage and ensure optimal performance.
Of what material are the strongest cables made?
The strongest cables are typically made from materials such as carbon fiber, kevlar, or ultra-high molecular weight polyethylene. These materials have exceptional strength-to-weight ratios and are commonly used in industries such as aerospace, military, and construction for their durability and high tensile strength.
Why tree build by only broadband coaxial cable?
So keep coax cables as least 6 in. away from electrical cable, even if the cables are separated by wood or other building materials.
Which materials can be recycled?
plastic, paper, tins, tin foil, iron, copper, steel, cables, glass, etc.
When is upright sprinkler are required?
When the fire protection is required above false ceiling to protect cables or combustable materials.
