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In a HT cable there are 2 layers of semiconductor one on the conductor and second on the XLPE insulation.
As we know semiconductor behaves as conductor when temperature rises. So when the HT cable is on load its conductor temperature rises due to this the semicon layer which is on conductor behaves like conductor and as a result overall cross section area is increased.
now the second semicon layer which is over XLPE on temp rise behaves as conductor and used for dessipating heat out of conductor as the cable heat due to load.
What else can I help you with?
Can you use HT cable in place of Lt cable?
For LT cable 1. Use : Up to 690V 2. Insulation : PVC 3. Core(Neutral) : Yes 4. Insulation Grading : 1100 V For HT cable 1. Use : Above 690 2. Insulation : XLPE 3. Core(Neutral) : No 4. Insulation Grading : Above 3.3kV, 11KV..etc ( Please note that now 690 V using in VFD application with LV cable and 440 V for DOT motor starter) from Kunal Singh Dabi the_dabi@rediffmaill.com
What precautions to be taken when working with Transformer?
Frist putt of the main incomer HT side then Rack out the breaker and put the LOTO after that Discharge the cable Both side (HT/LT).
Why Vacuum circuit breaker is using HT and why Air circuit breaker is using in LT?
Dielectric Strength of Vacuum is more than that of Air. In HT voltage is more than LT. So VCB is used in HT & ACB in LT. Rakesh Gaikwad
Why armour HT XLPE power cable required to Earth?
because when ever fault current occurs then the cable wont get damaged due to cable armored earthing to the gland for fault current to pass through groung
What is the benefit of using HT Motors instead of LT?
to reduce Current and Coast
What is the bending radius of HT cable?
15 D
Why cable glands not used for HT cables?
Cable glands are typically not used for high-tension (HT) cables because HT cables require specialized termination methods to manage the high voltages and prevent electrical arcing. HT cables often use insulated connectors and terminations that provide better sealing and insulation properties than standard cable glands. Additionally, the mechanical stresses and environmental factors associated with HT applications necessitate robust solutions that adhere to specific safety standards, which standard cable glands may not meet.
Can you use HT cable in place of Lt cable?
For LT cable 1. Use : Up to 690V 2. Insulation : PVC 3. Core(Neutral) : Yes 4. Insulation Grading : 1100 V For HT cable 1. Use : Above 690 2. Insulation : XLPE 3. Core(Neutral) : No 4. Insulation Grading : Above 3.3kV, 11KV..etc ( Please note that now 690 V using in VFD application with LV cable and 440 V for DOT motor starter) from Kunal Singh Dabi the_dabi@rediffmaill.com
What precautions to be taken when working with Transformer?
Frist putt of the main incomer HT side then Rack out the breaker and put the LOTO after that Discharge the cable Both side (HT/LT).
Why Vacuum circuit breaker is using HT and why Air circuit breaker is using in LT?
Dielectric Strength of Vacuum is more than that of Air. In HT voltage is more than LT. So VCB is used in HT & ACB in LT. Rakesh Gaikwad
Why armour HT XLPE power cable required to Earth?
because when ever fault current occurs then the cable wont get damaged due to cable armored earthing to the gland for fault current to pass through groung
What should be minimum insulation resistance value for 11 kV HT cable?
65 meg ohm if it is 11 kv
What is the benefit of using HT Motors instead of LT?
to reduce Current and Coast
How do you check HT cables for cracks?
1 look at them in the dark when power is running through them if you see a blue or orange arch your cable is faulty or use a mega ohm meter wrap the outer cable in foil ground it then mega it
What is a transformer and its functions?
Voltage transformer or potential Transformers are used in conjunction with Current transformers for metering and protection purpose in HT and LT power system.
What is HT switchgear?
what HT Swichgear
What should you do you they jump out?
Swing your arms in circles for momentum. You would not do that if u were using ht hang technique.
