High-voltage 110~220KV XLPE Cable
A. Brief introduction of the 110~220KV XLPE high-voltage cable products
1. The cross-linkage PE insulated and wrinkled aluminum wrapper waterproof PVC Sheathed Power Cable.
Type: YJLW02/YJLLW02
Specification: 240mm²--300mm²
Voltage: 110--220KV
Usage: Suitable for damp areas and the places with a lower underground water level and to be used underground, in tunnels or pipes. Such cables bear a bigger pulling force and pressure.
2. The cross-linkage PE insulated and wrinkled aluminum wrapper waterproof PE sheathed power cable.
Type: YJLW02/YJLLW02
Specification: 240mm²--300mm²
Voltage: 110--220KV
Usage: Suitable for damp areas and the places with a lower underground water level and to be used underground, in tunnels or pipes. Such cables bear a bigger pulling force and pressure.
B. Specific property for usage of 110KV~220KV XLPE high-voltage cable
1. Cable`s conductor highest working temperature is allowed up to 90℃, and overload when meet an emergency is 130℃ ,When short circuit (in ≤5 seconds) the highest temperature is 250℃
2. When installing or laying cable, the ambient temperature should be less than -20℃, and have to give a preheat to cable.
3. The minimum bending diameter:
After laying: 30D0
During laying: 40D0
4. Allowed biggest axial traction force to outer diameter when laying cable (not consider the radial lateral
pressure at bent section) T=K×core NO. ×section (kg), in formula, the coefficient K value should be: the copper core get 7, the aluminum core get 4.
5. Allowed biggest lateral-press P, when cable is being bent
The single core cable is required P≤500kg/m.
P=T/R (T is indicated axial traction force; R is indicated radius of bent-wheel), Knowing from above formula, as the traction force is made up by length and weight of cable. So it lets P to applying requirement as above. Then the diameter of bent-wheel should be widened.
6. Cable laying is not being restricted by drop.
Of course ,except 110~220KV XLPE Cable,we have 500kv XLPE Cable,230kv XLPE Cable, 750v Cable , 132kv Cable , 110kv Cable ect.
Aluminium Corrugated Cable,Copper Wire Screened Cable,500kv XLPE Cable,230kv XLPE Cable,750v Cable,132kv Cable,110kv Cable Huayuan Gaoke Cable Co.,Ltd. , http://www.bjhygkcable.com
What is high definition video
Everyone is familiar with standard definition (SD) analog TV. This is the TV we know and have been using for decades. The NTSC format (for North America and other regions) has a horizontal resolution of 525 lines and 30 frames per second. The PAL system (for the rest of the world) is 625 lines, 24 frames per second. The odd lines of the still picture are scanned first, and then the even lines of the same picture information are scanned. In this way, the two images will be displayed on the display at the same time, also known as 50/60 fields per second. This odd/even scan mode is called interlaced scanning and was developed to save transmission bandwidth (data rate capacity for a particular network connection). This resolution, called 480i, provides a picture of 240 lines of different information. The broadband requirement for home standard definition is 45-90 Mbit/s.
For small video displays (less than 27 inches), SDTV looks quite clear and smooth. However, if the screen is more than 27 inches, the image quality of the 480i format will drop significantly. You may also see jagged lines, blurred outlines, fading, visual noise, and intermittent motion.
The progressive scan mode, as an alternative to interlaced scanning, improves picture quality on large screens. Progressive scanning combines 480 lines of image information into one frame and automatically corrects the picture quality. Progressive scanning reduces the jagged image on the large screen and makes the picture motion smoother. This resolution of SDTV is called 480p.
True HD video displays image resolutions of 1080i or 720p, while other resolutions are not true high definition. The HD format provides more image information than any SD format. If you convert the screen resolution to pixels, you can clearly see that the HD format can provide at least 4 times more image information than the 480i format.
To visually understand the difference, imagine the TV screen as a computer monitor. Imagine how it would be to stretch a 640X240 (equivalent to 480i) low-resolution digital image onto a 42-inch screen. The image will be distorted because there is not enough image information in the low resolution image to provide the high quality view. The higher pixel count of the high-resolution format improves picture quality and makes the picture on the large screen clearer and smoother. In video conferencing, this technology can improve the overall visual experience and eliminate meeting fatigue. The color is also more vivid and true, and the movement is clear and smooth.
Standard for high definition video conferencing
Prior to the generation of HD encoding/decoding techniques, video conferencing data was encoded based on the Common Interchange Format (CIF). The International Telecommunication Union-Telecommunication Standards Department (ITU-T) has developed video standards called H.261 and H.263. The H.261 standard only defines the QCIF and CIF formats. The quarter CIF (QCIF) format is only used for conferences with the lowest data rates (64 kbit/s and lower) and is currently rarely used.
Since the release of the H.263 standard, more formats using the "full resolution" (defined as 16CIF) (4CIF and 16CIF) have been adopted. Due to the limitations of computing and bandwidth when using such standards, the common resolution for full-motion video conferencing is still CIF to 4CIF.
ITU-T recently adopted a new standard for video compression that reduces the size of the entire video file so that files can be transmitted more economically over smaller network connections (lower data rates/broadband).
ITU-T now recommends high-definition video conferencing using the H.264 video standard, which provides high-quality images with relatively low data rates. Today, H.264 has become a mandatory standard for HD-DVD (HD DVD) as well as broadcast, cable, video conferencing and consumer electronics.
H.264 technology is ideal for video conferencing. Although it requires higher processing performance than the previous H.26x algorithm, most video conferencing systems produced since 2004 include H.264. It provides high-quality video transmission and low-latency codec, making the video stream smoother and more natural. In fact, H.264 is twice as efficient as H.263, and the video quality is doubled at a particular line rate. In addition, some enhanced H.264 technologies include an interactive video error concealment algorithm that automatically adjusts video processing to ensure easy operation even when the network is overburdened, unstable, or has a high error rate. And provide a higher quality visual enjoyment.
The H.264 coding standard provides greater flexibility and provides a common platform for interoperability for different developers. The H.263 standard supports many different versions, while the H.264 standard contains only a few compression techniques. In this way, the integration of different video conferencing devices of multiple manufacturers can be more easily realized without significantly reducing the video quality.
The difference between HD video conferencing and HDTV
HDTV is a one-way broadcast, one-way transmission (playback) video of the TV network. High-definition video conferencing is a two-way, interactive process that transmits audio and video data in real-time, two-way over the network. In order to implement high-definition video conferencing technology, all terminals in the conference must support HD.
HDTV broadcasts can maintain a fixed signal quality, and the quality of video conferencing can be reduced due to the large amount of data transmitted over the network. The encoding/decoding process and the time it takes to transfer large amounts of data information over the network can cause delays in the processing. Excessive delays increase the chance of voice overlap and may cause video and audio to be out of sync. Long-term delays can be clearly manifested by audio effects, and poor quality sound effects can seriously affect the overall quality of the entire video conferencing experience.
What is high definition video
Everyone is familiar with standard definition (SD) analog TV. This is the TV we know and have been using for decades. The NTSC format (for North America and other regions) has a horizontal resolution of 525 lines and 30 frames per second. The PAL system (for the rest of the world) is 625 lines, 24 frames per second. The odd lines of the still picture are scanned first, and then the even lines of the same picture information are scanned. In this way, the two images will be displayed on the display at the same time, also known as 50/60 fields per second. This odd/even scan mode is called interlaced scanning and was developed to save transmission bandwidth (data rate capacity for a particular network connection). This resolution, called 480i, provides a picture of 240 lines of different information. The broadband requirement for home standard definition is 45-90 Mbit/s.
For small video displays (less than 27 inches), SDTV looks quite clear and smooth. However, if the screen is more than 27 inches, the image quality of the 480i format will drop significantly. You may also see jagged lines, blurred outlines, fading, visual noise, and intermittent motion.
The progressive scan mode, as an alternative to interlaced scanning, improves picture quality on large screens. Progressive scanning combines 480 lines of image information into one frame and automatically corrects the picture quality. Progressive scanning reduces the jagged image on the large screen and makes the picture motion smoother. This resolution of SDTV is called 480p.
True HD video displays image resolutions of 1080i or 720p, while other resolutions are not true high definition. The HD format provides more image information than any SD format. If you convert the screen resolution to pixels, you can clearly see that the HD format can provide at least 4 times more image information than the 480i format.
To visually understand the difference, imagine the TV screen as a computer monitor. Imagine how it would be to stretch a 640X240 (equivalent to 480i) low-resolution digital image onto a 42-inch screen. The image will be distorted because there is not enough image information in the low resolution image to provide the high quality view. The higher pixel count of the high-resolution format improves picture quality and makes the picture on the large screen clearer and smoother. In video conferencing, this technology can improve the overall visual experience and eliminate meeting fatigue. The color is also more vivid and true, and the movement is clear and smooth.
Standard for high definition video conferencing
Prior to the generation of HD encoding/decoding techniques, video conferencing data was encoded based on the Common Interchange Format (CIF). The International Telecommunication Union-Telecommunication Standards Department (ITU-T) has developed video standards called H.261 and H.263. The H.261 standard only defines the QCIF and CIF formats. The quarter CIF (QCIF) format is only used for conferences with the lowest data rates (64 kbit/s and lower) and is currently rarely used.
Since the release of the H.263 standard, more formats using the "full resolution" (defined as 16CIF) (4CIF and 16CIF) have been adopted. Due to the limitations of computing and bandwidth when using such standards, the common resolution for full-motion video conferencing is still CIF to 4CIF.
ITU-T recently adopted a new standard for video compression that reduces the size of the entire video file so that files can be transmitted more economically over smaller network connections (lower data rates/broadband).
ITU-T now recommends high-definition video conferencing using the H.264 video standard, which provides high-quality images with relatively low data rates. Today, H.264 has become a mandatory standard for HD-DVD (HD DVD) as well as broadcast, cable, video conferencing and consumer electronics.
H.264 technology is ideal for video conferencing. Although it requires higher processing performance than the previous H.26x algorithm, most video conferencing systems produced since 2004 include H.264. It provides high-quality video transmission and low-latency codec, making the video stream smoother and more natural. In fact, H.264 is twice as efficient as H.263, and the video quality is doubled at a particular line rate. In addition, some enhanced H.264 technologies include an interactive video error concealment algorithm that automatically adjusts video processing to ensure easy operation even when the network is overburdened, unstable, or has a high error rate. And provide a higher quality visual enjoyment.
The H.264 coding standard provides greater flexibility and provides a common platform for interoperability for different developers. The H.263 standard supports many different versions, while the H.264 standard contains only a few compression techniques. In this way, the integration of different video conferencing devices of multiple manufacturers can be more easily realized without significantly reducing the video quality.
The difference between HD video conferencing and HDTV
HDTV is a one-way broadcast, one-way transmission (playback) video of the TV network. High-definition video conferencing is a two-way, interactive process that transmits audio and video data in real-time, two-way over the network. In order to implement high-definition video conferencing technology, all terminals in the conference must support HD.
HDTV broadcasts can maintain a fixed signal quality, and the quality of video conferencing can be reduced due to the large amount of data transmitted over the network. The encoding/decoding process and the time it takes to transfer large amounts of data information over the network can cause delays in the processing. Excessive delays increase the chance of voice overlap and may cause video and audio to be out of sync. Long-term delays can be clearly manifested by audio effects, and poor quality sound effects can seriously affect the overall quality of the entire video conferencing experience.
What is high definition video
Everyone is familiar with standard definition (SD) analog TV. This is the TV we know and have been using for decades. The NTSC format (for North America and other regions) has a horizontal resolution of 525 lines and 30 frames per second. The PAL system (for the rest of the world) is 625 lines, 24 frames per second. The odd lines of the still picture are scanned first, and then the even lines of the same picture information are scanned. In this way, the two images will be displayed on the display at the same time, also known as 50/60 fields per second. This odd/even scan mode is called interlaced scanning and was developed to save transmission bandwidth (data rate capacity for a particular network connection). This resolution, called 480i, provides a picture of 240 lines of different information. The broadband requirement for home standard definition is 45-90 Mbit/s.
For small video displays (less than 27 inches), SDTV looks quite clear and smooth. However, if the screen is more than 27 inches, the image quality of the 480i format will drop significantly. You may also see jagged lines, blurred outlines, fading, visual noise, and intermittent motion.
The progressive scan mode, as an alternative to interlaced scanning, improves picture quality on large screens. Progressive scanning combines 480 lines of image information into one frame and automatically corrects the picture quality. Progressive scanning reduces the jagged image on the large screen and makes the picture motion smoother. This resolution of SDTV is called 480p.
True HD video displays image resolutions of 1080i or 720p, while other resolutions are not true high definition. The HD format provides more image information than any SD format. If you convert the screen resolution to pixels, you can clearly see that the HD format can provide at least 4 times more image information than the 480i format.
To visually understand the difference, imagine the TV screen as a computer monitor. Imagine how it would be to stretch a 640X240 (equivalent to 480i) low-resolution digital image onto a 42-inch screen. The image will be distorted because there is not enough image information in the low resolution image to provide the high quality view. The higher pixel count of the high-resolution format improves picture quality and makes the picture on the large screen clearer and smoother. In video conferencing, this technology can improve the overall visual experience and eliminate meeting fatigue. The color is also more vivid and true, and the movement is clear and smooth.
Standard for high definition video conferencing
Prior to the generation of HD encoding/decoding techniques, video conferencing data was encoded based on the Common Interchange Format (CIF). The International Telecommunication Union-Telecommunication Standards Department (ITU-T) has developed video standards called H.261 and H.263. The H.261 standard only defines the QCIF and CIF formats. The quarter CIF (QCIF) format is only used for conferences with the lowest data rates (64 kbit/s and lower) and is currently rarely used.
Since the release of the H.263 standard, more formats using the "full resolution" (defined as 16CIF) (4CIF and 16CIF) have been adopted. Due to the limitations of computing and bandwidth when using such standards, the common resolution for full-motion video conferencing is still CIF to 4CIF.
ITU-T recently adopted a new standard for video compression that reduces the size of the entire video file so that files can be transmitted more economically over smaller network connections (lower data rates/broadband).
ITU-T now recommends high-definition video conferencing using the H.264 video standard, which provides high-quality images with relatively low data rates. Today, H.264 has become a mandatory standard for HD-DVD (HD DVD) as well as broadcast, cable, video conferencing and consumer electronics.
H.264 technology is ideal for video conferencing. Although it requires higher processing performance than the previous H.26x algorithm, most video conferencing systems produced since 2004 include H.264. It provides high-quality video transmission and low-latency codec, making the video stream smoother and more natural. In fact, H.264 is twice as efficient as H.263, and the video quality is doubled at a particular line rate. In addition, some enhanced H.264 technologies include an interactive video error concealment algorithm that automatically adjusts video processing to ensure easy operation even when the network is overburdened, unstable, or has a high error rate. And provide a higher quality visual enjoyment.
The H.264 coding standard provides greater flexibility and provides a common platform for interoperability for different developers. The H.263 standard supports many different versions, while the H.264 standard contains only a few compression techniques. In this way, the integration of different video conferencing devices of multiple manufacturers can be more easily realized without significantly reducing the video quality.
The difference between HD video conferencing and HDTV
HDTV is a one-way broadcast, one-way transmission (playback) video of the TV network. High-definition video conferencing is a two-way, interactive process that transmits audio and video data in real-time, two-way over the network. In order to implement high-definition video conferencing technology, all terminals in the conference must support HD.
HDTV broadcasts can maintain a fixed signal quality, and the quality of video conferencing can be reduced due to the large amount of data transmitted over the network. The encoding/decoding process and the time it takes to transfer large amounts of data information over the network can cause delays in the processing. Excessive delays increase the chance of voice overlap and may cause video and audio to be out of sync. Long-term delays can be clearly manifested by audio effects, and poor quality sound effects can seriously affect the overall quality of the entire video conferencing experience.
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