1. What are the alternate functions?
When the main power supply is normally powered, the main power supply is automatically put into operation, and the backup power supply is reserved. When the main power supply fails or loses power, the backup power supply is put in. If the main power supply returns to normal, the main power supply is no longer automatically switched. Switch to mains power only when manually switching or standby power failure or loss of power.
Second, what is the self-return function?
When the main power supply is normally powered, the main power supply is automatically put into operation, and the backup power supply is reserved. When the main power supply fails or loses power, the backup power supply is put in. If the main power supply returns to normal, the main power supply is no longer automatically switched. Switch to mains power only when manually switching or standby power failure or loss of power.
Third, what is overload?
It means that the actual use load exceeds the rated load, mostly due to the increase in the number of electrical equipment, exceeding the approved capacity of the power supply enterprise or exceeding the designed capacity of the electrical circuit, which will cause the burning of the metering device and electrical equipment.
4. What is overload protection?
When the circuit current exceeds the rated value, different operating time limits are set according to the excess amplitude, and short-time overload such as motor starting can be avoided.
5. What is a short circuit?
In a normally powered circuit, current flows through the conductors and the electrical load, and back to the power supply to form a closed loop. However, if the middle part has two wires in the middle of the circuit through which it passes, or if it is short-circuited by another object with a small resistance, it is called a short circuit.
6. What is short circuit protection?
It means that the short-circuit fault of the electrical circuit can ensure that the power supply is cut off quickly and reliably, so as to avoid damage caused by the impact of short-circuit current on the electrical equipment.
7. What is the phase failure?
Refers to the phenomenon that one or more phases are disconnected in the metering loop, but not all phases lose voltage.
8. What is phase failure protection?
Relying on the disappearance of current in a phase conductor of a multiphase circuit to disconnect the protected device or relying on one or more phase losses of the multiphase system to prevent a way to apply power to the protected device.
9. What is an open circuit?
When the circuit does not close the switch, or the wire is not connected, or the appliance is burned out or not installed (such as connecting the voltmeter in the circuit), the entire circuit is disconnected somewhere.
X. Definition of undervoltage and overvoltage
For all electrical equipment, there is a rated voltage, but in practice, it is not guaranteed to work at rated voltage, it is a range around the rated voltage, generally required to be ±15%. If it is lower than -15%, it is "undervoltage". If it is higher than 15%, it is "overvoltage". Micro-signal training is worth your attention.
XI. The difference between undervoltage protection and overvoltage protection
Undervoltage protection: When the line voltage drops to a certain value, the motor can automatically stop from the power supply. A protection against the operation of the motor under undervoltage.
Overvoltage protection: A protection method that disconnects the power supply or reduces the voltage of the controlled device when the voltage of the protected line exceeds a predetermined maximum value.
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