How much wire and leakage switch should be used for each phase of 30 kW 380V power supply. How to calculate wire size and leakage switch

How much wire and leakage switch should be used for each phase of 30 kW 380V power supply. How to calculate wire size and leakage switch

4 × 16 square millimeter standard four core cable, or 3 × 16 + 1 × 10 specification, if using single core cable or 16 square millimeter; leakage circuit breaker, rated working current 80A (type D), leakage action current 30mA, recommended model nc100h (Schneider); if 30kW motor, please configure start control box, start, stop
How many Ma leakage protectors can 2.5 square meters of wire bear
How many Ma is the minimum operating current of leakage switch. It should be said that it is its rated safe working current
2.5 square meters of wire can withstand about 10A current
How many watts of electrical appliances can 0.03A leakage protector turn on
30mA, this is the leakage action current of the leakage protector. When there is 30mA leakage current in the load line, the leakage protector will trip
An electric energy meter is marked with "220 V, 10 (20) a". What does 20A in brackets mean? When calculating the maximum electric power, should we use 220 times 10 or 20
10A is the best operating current, just like the ammeter with a measuring range of 20a, the pointer is the most accurate measurement at 10A (1 / 2 ~ 2 / 3 of the total range), 20A is the maximum allowable safe operating current. It is not of great significance to calculate the maximum power! If you really want to calculate, the maximum power = 220 * 20 = 4400w
Calibration current is 20a, maximum power = 220 * 20 = 4400w
A little confused. Maximum power? It should be 20, but 10A is the rated current, 20A seems to be the maximum current allowed to pass in a short time. Anyway, it's impossible to say that 20 is the rated current after writing 10, otherwise what would 10 be used for? That 20 means that it can't exceed its value. It's an upper limit
5A, the calibration current of the meter is 5a, that is to say, the design parameters of this meter are based on 5A
20A is the long-term maximum current allowed by this meter to ensure accurate measurement and safe operation
When calculating the maximum electric power, use 220 times 20!
20A is the rated current
The maximum power is the voltage times the current is 220 * 20
What is the standard process of zero point segmentation?
Take this question as an example: | X-1 | + | x + 1 | + | X-2 | = 3
Let the common ratio of the equal ratio sequence {an} be q, the first n terms and Sn > 0 (n = 1,2...) And find the value range of Q
q> It's obviously true at 0
Q0
A1 > - A2 = - a1q, then Q > - 1, A3 must be greater than 0, and A4 = a3q, so A3 + A4 > 0 can continue to satisfy that every SN is greater than 0
So Q > 0 or - 1
Tan ^ 2A = 2tan ^ 2 ⊙ + 1 prove sin ^ 2 ⊙ = 2Sin ^ 2a-1
tan^2a=2tan^2⊙+1
sin^2a/(1-sin^2a)=2sin^2⊙/(1-sin^2⊙)+1
sin^2a/(1-sin^2a+sin^2a)
=(sin^2⊙+1)/(1-sin^2⊙+sin^2⊙+1)
sin^2a=(sin^2⊙+1)/2
So:
sin^2⊙=2sin^2a-1
If inequality (X & # 178; - 8x + 24) / (MX & # 178; - MX-1)
solution
x²-8x+24=（x-4）²-16+24=（x-4）²+8＞0
（x²-8x+24）/（mx²-mx-1）
x²-8x+24=(x-4)²+8>0
∴（x²-8x+24）/（mx²-mx-1）
Simplification: | √ 3 - √ 2 | √ 3-2 | - | √ 2-1 | requirements: Note: √ is the square root | | is the absolute value
Because | √ 3 - √ 2 | > 0, so | √ 3 - √ 2 | = √ 3 - √ 2 | √ 3-2 | < 0, so | √ 3-2 | = 2 - √ 3
|So | √ 2-1 | = √ 2-1
So the original formula = (√ 3 - √ 2) (2 - √ 3) - √ 2-1
=2√3-2√2+√6+3-√2-1
=2√3-3√2+√6-2
I'm glad to answer for you,
|√3-√2| |√3-2|-|√2-1|
=(√3-√2)(2-√3)-(√2-1)
=2√3-2√2-√6-√2+1
=2√3-3√2-√6+1
|√3-√2| |√3-2|-|√2-1|
=(√3-√2)(√3-2)|-(√2-1)
=3-2√3-√6+2√2-√2+1
=4-2√3-√6+√2
The first term is 81, the first n terms and Sn are log3 (an). If S11 is not S12 and S11 is the largest, the tolerance D of BN is calculated
b1=log3(81)=4
An = 81 * q ^ (n-1) [^ denotes power]
bn=log3(an)=4+(n-1)log3(q)
{BN} is an arithmetic sequence, the first term is 4, d = log3 (q)
And because S11 is the biggest
So B11 > 0, B120
4+11d