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First, summarize the existing answers:
Motor power greater than 10kW;
Motor power greater than 50kW;
The motor power is greater than 20% of the transformer capacity;
Frequently started motors cause a voltage drop of more than 10% during startup;
Occasionally started motors cause a voltage drop of more than 15% during startup.
There seems to be an empirical formula that can be used to determine whether to start the depressurization process by substituting it into the formula. Friends who know this formula are encouraged to supplement it.
There seems to be no basis for items 1 and 2. In reality, hundreds or hundreds of kilowatts of electric motors have full voltage direct starting.
Is the transformer unloaded for item 3?
How to control items 4 and 5 in practice? Is it an actual measurement?
In fact, the main purpose of using step-down starting is to avoid affecting the normal operation of other equipment. If there are no other equipment, only transformers and motors, then the power of the motor can be close to the capacity of the transformer. Considering factors such as power factor and efficiency, the general motor power is 80% of the transformer capacity, and can be started directly, or the transformer and motor can be started simultaneously.
In reality, when the vast majority of large motors start, there are more or less other loads on the transformer, so the amount of other loads also needs to be considered as one of the factors.
Why does starting an electric motor affect the operation of other electrical equipment?
Because the starting current of a cage motor is 5-7 times its rated current, a large current can cause a large voltage drop. If the voltage drop reaches a certain value, other electrical equipment may stop working or cause faults. Therefore, there are regulations that the voltage drop caused by frequent starting of motors should not exceed 10%, and the voltage drop caused by infrequent starting should not exceed 15%.
Contact information: 15359293870
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Signal input
Signal type: Transistor (PNP&NPN compatible)
NPN signal level (input): NPN: 0-5VDC
PNP signal level (input): PNP: 15-30VDC
Single channel consumption current: 5mA
Port protection (input): overvoltage impact protection
Input characteristics: NPN/PNP (compatible)
Electrical isolation: AC 500V
signal output
Signal type: relay
Rated level: relay 250VAC/30VDC
Single channel rated current: Relay: 5A
Port protection (output): overvoltage and overcurrent protection
Electrical isolation: AC 500V
General parameters
Protection level: IP20
Working temperature: 0-55 ℃
Storage temperature: -25~85 ℃
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