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Are transmission power cables capacity designed by voltage or by power is there any limit to the voltage that can pass?
Furkankhan
Transmission power cables are designed by current carrying capacity.
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∙ 12y ago
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Why are low voltage electrical cables earthed and high voltage cables not in an electrical system?
The answer is more obvious if you use slightly different terminology to ask it. You could re-phrase the question as:Why are the low-voltage wires in a building earthed , but high-voltage transmission lines not?Wiring in a building or home that a person may come in contact with is earthed, or grounded for safety. If a live conductor in a grounded system comes in contact with an equipment frame or other metal object, fault current flows and trips the overcurrent device. If the building's wiring were not ground-referenced, you could have exposed live parts and not know it. Surprise!On the other hand, high-voltage transmission lines are optimized to transport electrical power long distances. Power transmission typically uses 3-phase delta which does not need an earth connection. The grounded conductor, or neutral, is derived locally after the distribution transformer. Overcurrent protection is for the protection of the lines themselves, not for people that might accidentally come in contact with them! This is why there are such strict rules concerning keeping us separated from the transmission lines.Keep in mind that the transmission towers themselves are grounded, and there is usually a grounded wire up top, but this does not form part of the transmission system, it is there for lightning protection.AnswerUnderground high-voltage cables are earthed.
The high-voltage section of a unit substation contains devices called to which the incoming high-voltage cables are terminated?
potheads
What is the current capacity of two cables in parallel?
It will just be the sum of the current-carrying capacity of each individual cable.
Why are glass insulators used on power lines?
The large glass insulators are easy to mould, and are strong, well able to insulate the pylons from the high voltage the cables are designed to carry.
How do you calculate weight of PVC insulation on cables?
By multiply current supply and voltage
What two features of a high tension cable are designed to ensure electrical safety?
High-voltage cables are usually placed high above the ground. Also, where the cables touch the posts, special insulators are used.
What are transmission cables made of?
Transmission cables are made of conductors and insulating material covering that conductor.
What is the difference between ribbon cables and power cables?
Ribbon cables are mostly, but not always lower voltage signal carriers. Power cables are mostly larger and carry higher voltage to various parts tht need it.
Does the device or cable determine the voltage on a slow cooker?
The voltage is always determined by the device. (in this case a slow cooker).However, having established what voltage to supply to the device, the cable must be suitable for the voltage used. Everything in the chain of power transmission, must be rated for the correct voltage. Cables, plugs, fuses etc.
How does electricity get from the power stations to the consumers?
Usually through cables. The power produced by the generator (typically 24KV) is stepped up to the transmission voltage (typically 138KV) using transformers. At various substations, transformers, again, step the transmission voltage down to distribution voltage (typically 13.2KV). There is another step down at the service pole, where a transformer converts the distribution voltage to service voltage (typically 120/240V or 480V three phase).
What are the types of cables used for baseband and broadband transmission?
Twisted-pair cables Coaxial cables
What has the author J K Lynch written?
J. K. Lynch has written: 'Coaxial cable as a high-capacity transmission medium' -- subject(s): Coaxial cables
Why are the main support cables of the suspension cables designed to sag?
They can't be designed not to. Large cables and ropes are extremely different to stretch straight, because of their high weight-to-length ratio.
How do you test the 11KV HT cables?
The test equipment used to test high voltage cables is a hi-pot test where a high DC voltage is a applied to the cable. This voltage can be from 150% to 200% of the working voltage of the cable.See related links below.
Which table in BS 767112008 applies to the current carrying capacity of flat twin and earth cable?
The tables within Appendix 4; "Current-carrying capacity and voltage drop for cables and flexible cords." 4D1 to 4J4. For each type of cable, you will find (with a couple of exceptions) a Table A for current-carrying capacity values and following it, a Table B for voltage drop values.
What do you use to mark the high voltage cable?
Why is use the triangle system in high voltage cables
What causes low voltage to the transmission selonoid?
Cables aren't perfect conductors, they have a bit of resistance. This resistance cacuse a certain voltage drop. But the drop isn't proportional to the voltage running through the cable, so at lower voltages the proportion lost to internal resistance in the cable will be bigger than at higher voltages.
