@@CrimsonAlchemist Normally for a suspension tower, there will be a single string of insulators (15 No. for 220kV) for twin bundled conductor as well. However in case of angled or dead-end tower, there will be an insulator string for each conductor. So overall 2 strings (2 x 15) disc insulators for twin bundled conductor (220kV) in case of angled tower.
@@theengineeringpower4213 Much appreciated for the reply good Sir. Off topic, but is there such thing as 230kV Substation reaching capacity, for example if a district wants to add a new 150MW solar farm that wants to connect to the existing 230kV transmission line & 230kV substation. Are there ways to upgrade or there is such thing as max cap.
Thanks for the video. I knew there was a relationship between voltage and the number of insulation disks but could not remember the ratio. 1 disk = 15K, cool.
Sir l have a question according to IER 132 kv line ke liye to 13 disc insulator use kiya jata hai na bus kissi kissi substation me 132 KV line ke liye 10 disc insulator use kiya jata h???
Ideally there should be 1 disc insulator for each 11kV. But the exact number is not fixed and it varies according to the environment and moisture content in air. e.g. the number of disc insulators in a 500kV T/line can be 29 in normal places. However in coastal areas with high moisture content, it can be increased upto 45.
@@theengineeringpower4213 first of fall tqqqqq Sir for your reply but one more question kya kilo newton factor bhi disc insulator ke calculaton me role play karta hai??
@@shambhavimishra9688 Normally standard values of kN are used for different voltage levels and kN value also depend on number of conductors. e.g. for a 220KV line with single conductor, 80kN disc insulators are enough. But for twin-bundle conductor, we have to use 100kN disc insulators. Similarly for 500kV T/Lines, normally disc insulators of 160kN are used. So basically kN values are related to the mechanical strength required for disc insulators of a specific voltage level. Whereas number of disc insulators is related to electrical aspect of the line.
@@shambhavimishra9688 You are welcome. The Purpose of this channel is to share my personal practical experience on Extra high voltage sub stations and T/Lines. Feel free for any questions.
Flashover occurs as a result of direct path between conductor and the ground (e.g. Tower). When the disc insulators are dirty and have moisture (specially in coastal areas), a path is created between the disc insulators through which the current can flow. Similarly when the disc insulators are broken or punctured, they do not provide the required insulation and create a path for current flow. Flashover can also occur as a result of thunder strikes when the whole string of disc insulators is damaged resulting in a direct connection between the conductor and the tower. Simply, Flashover occurs when the disc insulators fail to provide insulation. Remember that flashover mostly occurs on vertical strings of disc insulators. because in case of rain, the water form a vertical path for current flow whereas in horizontal strings, the chance of flashover decreases.
@@kuwaitupdates631 The red balls are normally connected with the earth wire above the phase wires for clear visibility to aircrafts. These are mostly installed in hilly areas on heights to warn the low flying aircrafts.
The No. of discs gives general idea about voltage level. It is highly improbable that In same country, both the voltage levels of 115kV and 132kV are used. Normally in a single country, it is 132kV, 220kV, 500kV, 765kV etc. Similarly in another country it can be 110kV, 220kV, 380kV etc. So we can observe that there is considerable difference in different voltage levels used in same region. Therefore by counting the No. of disc insulators, a generalized approximate value of voltage level can be assessed.
Yes the No. of discs can vary according to weather conditions but that's for exceptional cases. In routine, the standard No. of disc insulators is followed. e.g. in areas with high moisture content (near to sea etc.), a larger No. of disc insulators are used as compared to the Normal areas for the same voltage levels.
True, but, a lot of that is included in the voltage rating of the individual discs. They are rated for moisture, but not necessarily for the accumulation of salt or other conductive contaminants. Cleaning insulators is a routine maintenance, but all too often, neglected until a flash over actually occurs.
Thank you so much again. I couldn't find the answers anywhere else except here
So if it's a double conductor there will be two 15 disc insulators? For each line?
You are most welcome and thanks for ur valuable comments.
@@CrimsonAlchemist Normally for a suspension tower, there will be a single string of insulators (15 No. for 220kV) for twin bundled conductor as well. However in case of angled or dead-end tower, there will be an insulator string for each conductor. So overall 2 strings (2 x 15) disc insulators for twin bundled conductor (220kV) in case of angled tower.
@@theengineeringpower4213 Much appreciated for the reply good Sir.
Off topic, but is there such thing as 230kV Substation reaching capacity, for example if a district wants to add a new 150MW solar farm that wants to connect to the existing 230kV transmission line & 230kV substation. Are there ways to upgrade or there is such thing as max cap.
Thanks for the video. I knew there was a relationship between voltage and the number of insulation disks but could not remember the ratio. 1 disk = 15K, cool.
Wow, never heard it before. Thanks so much
Thanks for appreciation. Keep in touch for more informative videos.
My left ear enjoyed this
Sir l have a question according to IER 132 kv line ke liye to 13 disc insulator use kiya jata hai na bus kissi kissi substation me 132 KV line ke liye 10 disc insulator use kiya jata h???
Ideally there should be 1 disc insulator for each 11kV. But the exact number is not fixed and it varies according to the environment and moisture content in air. e.g. the number of disc insulators in a 500kV T/line can be 29 in normal places. However in coastal areas with high moisture content, it can be increased upto 45.
@@theengineeringpower4213 first of fall tqqqqq Sir for your reply but one more question kya kilo newton factor bhi disc insulator ke calculaton me role play karta hai??
@@shambhavimishra9688 Normally standard values of kN are used for different voltage levels and kN value also depend on number of conductors. e.g. for a 220KV line with single conductor, 80kN disc insulators are enough. But for twin-bundle conductor, we have to use 100kN disc insulators. Similarly for 500kV T/Lines, normally disc insulators of 160kN are used. So basically kN values are related to the mechanical strength required for disc insulators of a specific voltage level. Whereas number of disc insulators is related to electrical aspect of the line.
@@theengineeringpower4213 thankssssssssssssssssss a lotttttttttt....... Sir for your valuable reply
@@shambhavimishra9688 You are welcome. The Purpose of this channel is to share my personal practical experience on Extra high voltage sub stations and T/Lines. Feel free for any questions.
Can you explain if you haven’t already what flashover is? Thanks
Flashover occurs as a result of direct path between conductor and the ground (e.g. Tower). When the disc insulators are dirty and have moisture (specially in coastal areas), a path is created between the disc insulators through which the current can flow. Similarly when the disc insulators are broken or punctured, they do not provide the required insulation and create a path for current flow. Flashover can also occur as a result of thunder strikes when the whole string of disc insulators is damaged resulting in a direct connection between the conductor and the tower. Simply, Flashover occurs when the disc insulators fail to provide insulation. Remember that flashover mostly occurs on vertical strings of disc insulators. because in case of rain, the water form a vertical path for current flow whereas in horizontal strings, the chance of flashover decreases.
@@theengineeringpower4213 thanks
@@lissadawes4243 You are welcome
Very good explanation, pl continue
thanks brother. We will continue uploading more relevant videos.
@@theengineeringpower4213 red ball connect with Transmission line plz explain this for what purpose,for identified line or for other purposes.
@@kuwaitupdates631 The red balls are normally connected with the earth wire above the phase wires for clear visibility to aircrafts. These are mostly installed in hilly areas on heights to warn the low flying aircrafts.
hf, gi =138KV TO 7,65 KV OR HIGHER) AND SUBTRANSMISSION (34.5 KV TO 1,61 KV)
Z
Ω
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∗
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Can't differentiate between 115 kV and 132 kV line by counting number of the discs. Sorry
The No. of discs gives general idea about voltage level. It is highly improbable that In same country, both the voltage levels of 115kV and 132kV are used. Normally in a single country, it is 132kV, 220kV, 500kV, 765kV etc. Similarly in another country it can be 110kV, 220kV, 380kV etc. So we can observe that there is considerable difference in different voltage levels used in same region. Therefore by counting the No. of disc insulators, a generalized approximate value of voltage level can be assessed.
@@theengineeringpower4213 USA
Unreliable. The number of disks also depends on the mean weather conditions, contamination factors etc...
Yes the No. of discs can vary according to weather conditions but that's for exceptional cases. In routine, the standard No. of disc insulators is followed. e.g. in areas with high moisture content (near to sea etc.), a larger No. of disc insulators are used as compared to the Normal areas for the same voltage levels.
True, but, a lot of that is included in the voltage rating of the individual discs. They are rated for moisture, but not necessarily for the accumulation of salt or other conductive contaminants. Cleaning insulators is a routine maintenance, but all too often, neglected until a flash over actually occurs.