The 182 kilowatt air conditioner is 125 meters away from the transformer, and the copper core cable

Brother Chen did not consider the current carrying capacity, according to the voltage drop of 125 meters is not the main problem, the main consideration is the current carrying capacity, the current of 360 amperes must be at least 95 square copper or 120 square aluminum wire.

If it is the power supply bureau that installs more than 300 wires for you.

The 182 kilowatt air conditioner is calculated according to three phases, current: l 360a, distance: l 125 meters, copper core wire resistivity: , transformer is 400v, load terminal voltage is 380v, line and line loss voltage drop is 20v, single line voltage drop: u 10v

Find the single-wire resistance:

r＝u/i＝10/360≈

Find the single-line cross-section:

s l r squared).

Reply to xhplh:

The current carrying capacity has been considered, the safe current carrying capacity of the medium-section copper core wire per square is about 4 5a, the line is short and can take a large value, and the calculated line cross-section can carry the current of nearly 400a, at the same time, there is no such wire gauge, only 70 or 95 square wire gauge.

About 100 square meters of copper wire is about the same

According to the current of 360A, according to the long-term allowable current carrying capacity, that is, the safety current, PVC insulated PVC sheathed power cable, check the meter, must be copper core 3 240mm 2. Laid in air, 396A, ambient temperature +25°C.

The allowable voltage loss is then used to check the calculation. Let the allowable voltage loss be 7%, calculate the number of AKMs: 360, and calculate the allowable voltage loss for each AKM

7%/45=。Let the power factor be, look up the table, the above cable, the voltage loss of each AKM is, that is, the voltage loss is qualified.

The 182 kilowatt air conditioner is 125 meters away from the transformer and needs 120 square meters of copper core cable to supply power.

According to the power formula p=have:i=p (

325A (calculated according to the three-phase mains, the power factor is taken.)

Check the table below, you can choose 120 square meters (current carrying capacity of 346A) copper wire.

Voltage loss calculation:

Distance: l 125 meters.

Copper wire resistivity:

Cable cross-sectional area: s=120mm.

Resistance of the cable: r defeat l s=

The voltage drop of the cable is: u ir=

Rubber pressure loss rate of electric car of cable:

Therefore, the voltage loss rate of the cable is within the range specified in the "Code for Planning and Design of Urban Distribution Network". 120 square copper cable can be selected.

Power 182kw select cable.

Rated current i=p Aberdeen.

Copper cable 90 mm².

Three principles for choosing a wire:

1) Select the cross-section of the wire (safe ampacity) according to the heating conditions for the short distance and small load, and control the current with the heating conditions of the wire, the smaller the cross-sectional area, the better the heat dissipation, and the greater the current passing through the unit area.

2) Long-distance and medium-load on the basis of safe ampacities, according to the voltage loss conditions to select the wire cross-section, long-distance and medium-load is not enough to not heat, but also to consider the voltage loss, to ensure that the voltage to the load point in the qualified range, electrical equipment can work normally.

3) On the basis of the qualified safe current carrying capacity and voltage drop, the large load is selected according to the economic current density, that is, the power loss should also be considered, and the power loss and capital investment should be in the most reasonable range.

Safe ampacities of the wire.

In order to ensure the continuous operation of the wire for a long time, the allowable current density is called the safe ampacity.

The general regulations are: copper wire selection 5 8a mm2; Aluminum wire selection 3 5a mm2.

The amount of safe current-carrying hand should also be determined according to the extreme temperature, cooling conditions, laying conditions and other comprehensive factors of the core use environment of the wire.

Under normal circumstances, the distance is short, the cross-sectional area is small, the heat dissipation is good, the temperature is low, etc., the conductivity of the wire is stronger, and the upper limit of the safe current carrying capacity is selected;

Long distance, large cross-sectional area, poor heat dissipation, high temperature, poor natural environment, etc., the conductivity of the wire is weaker, and the lower limit of safe current carrying is selected;

For example, the conductivity of bare wires is stronger than insulated wires, overhead wires are stronger than cables, cables buried in the ground are stronger than cables laid on the ground, and so on.

About 350 amps, you can use 70 square copper core cables, and 95 is a bit wasteful.

240 square meters of aluminum cable can be selected, and 185 square meters of copper cable can be used, which can ensure the long-term operation of the air conditioner.