What are the criteria for selection of wiring cables?
Cable size selection is based on three main factors:
- Current carrying capacity.
- Voltage regulation.
- Short circuit rating.
On which factor the LT HT power cable is selected?
The selection of cable size is based upon the following factors: Current carrying capacity. Voltage regulation. Short circuit rating.
What is cable selection?
Cable selection is about choosing the appropriate type of conductor and selecting a suitable size/cross-section area/ diameter of the conductor according to the application.
How do I choose cable size?
There are two pieces to the wire size question: thickness (gauge) and length. To determine what gauge wire you need, consider the carrying capacity and the amount of current the wire needs to conduct (measured in amperage or amps). Wire gauge is directly related to how many amps you need to run through it.
How do you calculate HT side cable size?
1. Cable current carrying capacity
- Ifull-load = 12.5 × 106 / 1.73 × 20 × 103 = 361 A.
- Therefore subsequent current rating of cable to be 361 / 0.97 × 0.84 = 443 A.
- Isc = K × A / √t.
- Isc = 240 × 143 / √1 = 34.4 kA.
- Vd = Ifl × XL × sinφ + Ifl × R × cosφ volts.
- If = (1000 × 0.15) / (1 + 0.15) = 131 A.
How do you calculate HT cable length?
The rating of the cable should be 150% of the full load current. i.e if your transformer’s primary current is 450 Amps means, you should choose 450 *150% = 675 Amps capacity size cable.
Why is cable sizing important?
Proper sizing of cabling is most important for the reliability, consistency and safety of the system. The oversize cable is a waste of money and under-size can cause short circuit or fire. Also, you have to consider the type of cable (single-core, multi-core) whatever is suitable for your application.
What can limit cable rating?
Ambient air temperature For all cables as ambient (environment) temperature, whether it be air or soil, is increased nearer to the maximum conductor temperature limit the current rating is reduced.
How many types of HT cables are there?
Medium and High Tension Cables 2. Super tension (ST) cables for 22 kV and 33 kV levels which are screened cables. 3. Extra high tension (EHT) cables for voltage levels from 33 kV to 66 kV which are pressure cables.
What is the size of 11kv cable?
95 sq mm
Product Specification
| Insulating Material | XLPE |
|---|---|
| Power/Voltage | 11 kV |
| Length | 500 mtr |
| Cable Size | 95 sq mm |
| Usage/Application | Under Ground Cabling |
How do you calculate cable size in kva?
Full Load Current = (KVA · 1000) / (1.732 · Voltage): Full Load Current = (100 · 1000) / (1.732 · 415) = 139 Amp….Let’s select 3.5 core 95 Sq.mm cable for single run, short circuit capacity = 8.2 KA.
- Current capacity of 95 Sq.mm cable is 200 Amp,
- Total derating current of 70 Sq.mm Cable = 200 · 0.93 = 187 Amp.
How do you calculate HT cable size?
How many types of HT cable are there?
How do you calculate the size of an HT cable?
How many kW can a 16mm cable carry?
Dave. “Using the TLC volt-drop calculator, it gives a max of 21Kw for 17metres of 16.0mm XLPE SWA Hope this helps, Dave.” 21 kW divided by 230 V gives ~91.3 A which exceeds the rating of 89 A given for Method C in table 4D4A….