Comparison between Three Phase Overhead and Underground cables


Power can be transferred through Overhead cables or Underground cables. In overhead lines inductance is predominant and in case of underground cables capacitance is predominant.

There are always advantages of Overhead transmission lines in comparison to underground cables:-

1.     The conductor used in Overhead transmission lines is less expensive as size of cable required in overhead lines is less than underground cables. As overhead lines have better heat dissipation than underground cables.

2.     Insulation cost in case of underground cables is more than overhead lines. Overhead lines use bare conductors which are well supported and provide sufficient spacing between conductors. But in underground cables insulation is provided by various high grade paper tapes. A metal sheath is also provided so that moisture doesn’t enter the cable. Oil and inert gas is inserted so as to fill voids. Also storage vessels are needed to be installed after some intervals so to makeup the voids created during expansion and contraction of oil or gas in cables.
3.     Also erection cost of overhead line is much less than underground cables.
4.     It is easy to do capacity addition in overhead lines than underground cables.



There is some advantages of underground transmission than overhead transmission:-\

1. Underground cables provide safety to public.
2. Underground cable doesn't give interference and also underground cables provide better looks to surroundings.

Comments

Post a Comment

Popular posts from this blog

A2XWY; A2XFY Cables meaning; XLPE cables advantages over PVC cables

Technical Specification of Aluminum Cables in terms of codes So many times you have seen coding while specifying cables technical such as A2XWY now what does this means. Now there is nomenclature for the same which is used while describing the same. Where A -  Aluminium 2X- XLPE Insulation W – Steel round wire armour F- Steel Strip Armour WW- Double Steel round Armour FF- Double Steel Strip Armour Y- PVC outer Sheath Wa- Non Magnetic round wire Armour Fa- Non Magnetic Strip Armour AW- Aluminum Wire Armour Now As per A2XWY – This describes that it is Aluminum cable, XLPE insulated, With Steel round wire armour and having PVC outer Sheath. This coding is as per IS 7098(Part1):1988. You have also seen that there is coding for copper so there is no coding required in case of copper cables. XLPE cables advantages over PVC cables/ Thermoplastic cables:- 1.       XLPE cables have higher Power rating about 1.2 times PVC cables 2.       XLP...
Read more

Digital Multimeter working principle; DMM working

Image
Digital multimeters are most widely used in every industry as it used for measurement of Voltage, Current, Resistance, Capacitance and various other parameters. DMMs have been available for very several years. Yet it is still challenging to locate advice about how a digital multimeter works. The operation of a digital multimeter is comparatively uncomplicated, although there are obviously differences in how digital mulimeters work if they're from different makers.Despite this, there are several similarities and some general principles of how digital multimeters work. Fundamentals of how a DMM functions The key process occurring within a digital multimeter for any measurement is that of voltage measurement. All other measurements are derived from this basic measurement. So the best technique for understanding how a digital multimeter functions is in understanding this procedure. There are many kinds to digital converter, ADC. Nonetheless the one that is most widely used DMMs in di...
Read more

Wireless voltmeter using Arduino and RF 433MHz receiver and transmitter

Image
In this project i showed you how to make a wireless voltmeter using arduino and RF 433MHz receiver and transmitter. You can use this code and concept for many other projects, any project which used sensor with analog voltage output to sense temperature, gas leakage or light , etc. For example you can put a LM35 temperature sensor rather than potantiometer, you just have to putting its formula which convert LM35 output pin voltage to exact temperature. You also can make a wireless AC or DC power meter by doing some change in code and hardware (using hall effect current sensor and single phase voltage sensor). This type of RF module has distance range up to 200 meters according to datasheet but when i bought this RF module from Aliexpress its distance rang was very low, but i set its adjustable RF coil very carefully and i get very higher distance rang.(Don't play with RF coil if your module works good), You also have to use a 6 inch antenna to increase distance range to max as possi...
Read more