5 thoughts on “How many kilowatts and how many interruptions are calculated?”
Eugene
Suppose it is a three -phase 380V50Hz AC electricity, and the power is a 30 -kilowatt motor. The calculation method of 53.625 Ann The calculation method is as follows: Colonal calculation formula according to the power of three -phase electricity: p = √3UICOSA (COSA refers to power factor, generally 0.85) i = p ÷ (( 1.732 × 380 × 0.85) = 30000 ÷ (1.732 × 380 × 0.85) i = 53.625 (A) n Theoretically, the current is greater than 53.625. The expansion information: The circuit breaker can turn off, carry and open the current under normal circuit conditions, and can turn off, carry, and open the current of the current under the condition of the specified time Essence The circuit breakers are divided into high -pressure circuit breakers and low -voltage circuit breakers according to their use range. The level of high and low voltage lines is relatively vague. Generally, 3KV or more is called high -voltage electrical appliances. The circuit breaker can be used to allocate power, and asynchronous motors are not launched frequently, and the power lines and motors are implemented. When they have serious overload or short -circuit and lack of voltage, they can automatically cut off the circuit. Their function is equivalent to equivalent to equivalent to The combination of the fuse switch with over -thermal relay. And generally do not need to change parts after disconnection failure. At present, it has been widely used. The power distribution is an extremely important link in the generation, transportation, and use of electricity. The power distribution system includes transformers and various high and low -voltage appliances, and low -voltage circuit breakers are electrical appliances with large amounts of large aspects. The circuit breaker is generally composed of the contact system, arc extinguishing system, operating mechanism, deedr, shell, etc. When a short circuit, the magnetic field generated by large currents (generally 10 to 12 times) overcome the reaction spring, the deedr pulls the operation of the operating mechanism, and switches instantly. During the overload, the current becomes larger, the heat is intensified, and the dual metal piece deforms to a certain extent to promote the movement of the mechanism (the larger the current, the shorter the action time). The electronic type, use the intestines to collect the current size of each phase, compared with the set value, when the current is abnormal, the microprocessor sends a signal, so that the electron deductor drives the operation of the operating mechanism. Reference materials Source: Baidu Encyclopedia-Electricity Reference materials Source: Baidu Encyclopedia-Three-phase Circuit Reference Data Source: Baidu Encyclopedia-Three-phase Circuit Encyclopedia-Dispeller
Give you a table KW A 0.75 2 1.1 2.8 1.5 3.7 2.2 5.0 3 6.6 4 8.5 n 5.5 11.5 7.5 15.5 11 22 15 30 18.5 37 22 44 30 59 37 72 45 85 55 105 This table is 380V 1 Electric Motor Protection Form; the circuit breaker deduction is a single electromagnetic deduction. In summary, the rated current is similar = power (KW)*2
Suppose it is a three -phase 380V50Hz AC electricity, and the power is a 30 -kilowatt motor. The calculation method of 53.625 Ann
The calculation method is as follows:
Colonal calculation formula according to the power of three -phase electricity: p = √3UICOSA (COSA refers to power factor, generally 0.85)
i = p ÷ (( 1.732 × 380 × 0.85) = 30000 ÷ (1.732 × 380 × 0.85)
i = 53.625 (A) n Theoretically, the current is greater than 53.625.
The expansion information:
The circuit breaker can turn off, carry and open the current under normal circuit conditions, and can turn off, carry, and open the current of the current under the condition of the specified time Essence The circuit breakers are divided into high -pressure circuit breakers and low -voltage circuit breakers according to their use range. The level of high and low voltage lines is relatively vague. Generally, 3KV or more is called high -voltage electrical appliances.
The circuit breaker can be used to allocate power, and asynchronous motors are not launched frequently, and the power lines and motors are implemented. When they have serious overload or short -circuit and lack of voltage, they can automatically cut off the circuit. Their function is equivalent to equivalent to equivalent to The combination of the fuse switch with over -thermal relay. And generally do not need to change parts after disconnection failure. At present, it has been widely used.
The power distribution is an extremely important link in the generation, transportation, and use of electricity. The power distribution system includes transformers and various high and low -voltage appliances, and low -voltage circuit breakers are electrical appliances with large amounts of large aspects.
The circuit breaker is generally composed of the contact system, arc extinguishing system, operating mechanism, deedr, shell, etc.
When a short circuit, the magnetic field generated by large currents (generally 10 to 12 times) overcome the reaction spring, the deedr pulls the operation of the operating mechanism, and switches instantly. During the overload, the current becomes larger, the heat is intensified, and the dual metal piece deforms to a certain extent to promote the movement of the mechanism (the larger the current, the shorter the action time).
The electronic type, use the intestines to collect the current size of each phase, compared with the set value, when the current is abnormal, the microprocessor sends a signal, so that the electron deductor drives the operation of the operating mechanism.
Reference materials Source: Baidu Encyclopedia-Electricity
Reference materials Source: Baidu Encyclopedia-Three-phase Circuit
Reference Data Source: Baidu Encyclopedia-Three-phase Circuit Encyclopedia-Dispeller
Single phase 8A, three -phase 2A, multiplied by a kilowatt count = circuit breaker rated current
Single-phase electric currents per kilowatt current are 4.5-5A, and the current of three-phase electricity per kilowatt is 2A.
Give you a table KW A
0.75 2
1.1 2.8
1.5 3.7
2.2 5.0
3 6.6
4 8.5 n 5.5 11.5
7.5 15.5
11 22
15 30
18.5 37
22 44
30 59
37 72
45 85
55 105 This table is 380V 1 Electric Motor Protection Form; the circuit breaker deduction is a single electromagnetic deduction. In summary, the rated current is similar = power (KW)*2
How big is 96 kilowatts?