Now, we can consider these four points one by one and choose a cable which complies all these requirements. Note : the given table is for copper cable XWY. So from above table you can choose 1. Or our blog De-rating Factor of Cables. For example, if your cable length is too large, there will be a larger voltage drop. If you supply Volts single phase at the source, your load might receive Volt due to voltage drop in the cable.
And due to voltage drop there will be heating losses in the cable. To know how to calculate the voltage drop in a cable you can read our blog How to create cable schedule for a project. To know the size of cable we must consider a couple of things, short circuit current and normal condition current carrying capacity. Hi Reader, hope below information covers up whatever you are looking for.
Please post comment below if you need more info on any electrical related queries. Or mail us at pratham gmail. Every state has its own works department which publishes SOR — schedule of rates and technical specification every year. If you cant find it yet, let us know your state and country. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content. Load — The load of circuit is available in kW or watts.
11kv transmission line
For example if you are calculating the size of cable for a 1 kW single phase pump. Load on the circuit is 1 kW. Now, calculate the current that will be running in the circuit due to 1 kW load of the pump.
Conductor Cross section in sq. The second factor which you should consider before choosing a cable size is the length of the cable and the permissible voltage drop of the system. Next comes the short circuit current of the system, for a Volts single phase system, design short circuit is 6kA, for 11kv it is up to 25 kA and 33 kV it is up to 70 kA. So if you are detailed engineering we would suggest considering rated short circuit current for cable also. To get the minimum cross section area required of a cable based on short circuit current.
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Obliviously, this is an interview type question for electrical engineers especially related to power engineering. Now, we are going to explain the simple logic behind the story.
First of all, It is not true that all the transmissions and distribution voltages are multiple of But kV, kV and kV etc are not multiple of 11 in case of electric power system generation, transmission and distribution in power lines from the generation station to the receiving point. Most of you may opt for form factor 1. Lets see below:. Form Factor is the ratio between the R.
Mathematically, It can be expressed as. For a sinewave, the form factor is given below:. The above calculation clearly shows that the results are different then the general values i. Also, alternator and generator with terminal voltages are available i range of 10kv — 15kV which is not to do with multiple of Now back to the point, the voltage at the receiving end are generally:.
While the receiving end voltage are 10kV due to voltage drop. More examples are given in below table. Well, this is not the end as some serious questions arise here. If this is the reason mentioned above, then:.
But we dont know the exact value of voltage drop as it depends on the value of current where the current is not constant i. For the same rating of kVA, the higher the voltage and lower the current will reduce the line loss as well as voltage drop in the transmission line.
This is the same case with corona i. Same answer given for question number 2. Why not 44kV, 55kV, 77kV and so on Voltage levels for transmission?
Why Electric Power Transmission is Multiple of 11 i.e 11kV, 22kV, 66kV etc?
Yes, we can make it i. In the initial, engineers considered the 11kV, 22kV, 33kV, 66kV, kV etc based on the transmission distances from generation point to the receiving end and the system and these level were satisfactory for different transmission distance.
So no need to make changes or make additional level of voltages due to high cost as new rating breakers and switchgears are needed to manage the new system even the whole pattern may need to change. So they want to keep is simple. That is the valid point as well. Before the concept of distributed generation systemreceiving end was far away from the generation station e. Your home appliance or factory machines too far from the hydroelectric power plant.LCD screen automatic conveying line static anti scratch assembly line filling machine.
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Power Distribution Equipment Power Accessories. Supplier Types. Trade Assurance Supplier. Product Types. Ready to Ship. Philippines 1. South Africa 1. Home transmission line 11kv transmission line. Contact Supplier. Automatic assembling line. Go to Page Go. About products and suppliers: Alibaba. These high-capacity and automatic 11kv transmission line are improvised with modern technologies and are extremely crucial for power plants, substations and various commercial power distribution stations.Supply Record: African countries, Arabian countries, Asian countries etc.
Origin: Guangdong, China. Antiseptic ACSR has good antiseptic feature, it is applied to coast area, salt sand area for ultra-high voltage, distribution transmission line. About us:. There are employees including over intermediate and senior technical personnel with 9 senior titles which contributes strong power of scientific research, management and innovation. The researching and manufacturing of conductor applied in kV to kV ultra-high voltage DC transmission line is in the domestic advanced level.
How to calculate size of a cable for 11kV or 33kV line
Are you a trading company or manufacture? We are a wire and cable Manufacturer with 30 years history almostly, our factory located in Qingyuan, Guangdong Province, China. What is your main product? Can you offer me a free sample?
Yes, sample is free but the freight charge should be borne by you. How is the payment? What is the lead time for mass production?
It depends on the order quantity and the season you place the order. Normally within 1 month. Your logo and company name can be printed on our products. Do you have after-sale service? Yes, 12 months warranty. Toggle navigation.
Home About us Product News Contact us. Model NO. Insulation Material: Bare Conductor Cable. Sheath Material: Bare Conductor Cable. Material Shape: Round Wire. Trademark: GDYG. Specification: mm2 Size. HS Code: Product Description. FAQ: 1.Substation provides the energy supply for the local area in which the line is located.
The main function of the substation is to collect the energy transmitted at high voltage from the generating station and then reduce the voltage to an appropriate value for local distribution and gives facilities for switching.Low Tension Line (LT) and High Tension Line (HT) in Hindi
The substation is of two types one is the simple switching type where the different connection between transmission line are made and the other is the converting stations which convert AC to DC or vice versa or convert frequency from higher to lower or lower to higher.
The substation has an additional function like they provide points where safety devices may be installed to disconnect equipment or circuit in the event of the fault. The synchronous condenser is placed at the end of the transmission line for improving the power factor and for measuring the operation at the various part of the power system. Street lighting, as well as the switching control for street lighting, can be installed in a substation.
The single line diagram of an 11 KV substation is shown in the figure below. The single line diagram makes the system easy and it provides the facilitates reading of the electrical supply and connection. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content Substation provides the energy supply for the local area in which the line is located.
Leave a Comment Cancel Reply Your email address will not be published.They can carry alternating current or direct current or a system can be a combination of both. Also, electric current can be carried by either overhead or underground lines. The main characteristics that distinguish transmission lines from distribution lines are that they are operated at relatively high voltages, they transmit large quantities of power and they transmit the power over large distances.
The voltages vary according to the particular grid system they belong to. Transmission voltages vary from 69 kv up to kv. The following are examples of different overhead transmission line structures in use today. The DC voltage transmission tower has lines in pairs rather than in threes for 3-phase current as in AC voltage lines. One line is the positive current line and the other is the negative current line.Solethen organizza un seminario per promuovere la piattaforma
Figure 1. Some typical transmission line structures Figure 2. Transmission lines crossing the San Fernando Valley Figure 3. DC voltage transmission lines Figure 5. Transmission lines above - subtransmission below Figure 6. Double set of transmission lines side by side.
Subtransmission Lines TOP Subtransmission lines carry voltages reduced from the major transmission line system.
11kv Overhead Transmission Line ACSR Dog Conductor
Typically, Sometimes the subtransmission voltage is tapped along the way for use in industrial or large commercial operations. Some utilities categorize these as transmission lines. Figure 8. Subtransmission lines above and distribution lines below Figure Subtransmission lines with distribution underbuild.
They may be buried with no protection, or placed in conduit, trenches, or tunnels.
Figure Transmission lines are installed in a tunnel, which enables many circuits in a limited area. Covering the transmission line Figure Heat is generated when electricity flows through cables, limiting the power transmission capacity in tunnels.
To increase the capacity, a tunnel cooling system can be installed. The system above circulates cold water through the tunnels. Cable snaking through underground transmission tunnel Figure Cable installation of underground transmission line Figure What's New Offices.10 week test e cycle
Illustrated Glossary : Transmission Lines Transmission lines carry electric energy from one point to another in an electric power system. Overhead AC transmission lines share one characteristic; they carry 3-phase current. Some typical transmission line structures.
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