Several problems commonly used in power supply

Update date:2018-05-05 Source:MAXGE

Several problems commonly used in power supply

If the power plant output is a "clean" high-quality power source, but after transmission and distribution, affected by weather, user equipment, human factors, voltage overshoot, drop, interruption, common mode noise and other power quality problems are quite prominent . Especially in the industrial environment, the power supply quality is generally worse. It cannot be ignored that the power distribution of buildings designed in the early years cannot meet the needs of today's information society. Frequently occurring in the power grid and causing interference or damage to computers and precision instruments are mainly manifested in the following aspects:

Molded Case Circuit Breaker,(mccb)

1. Power surges: The output voltage is rms higher than 110% of the nominal value and lasts for one or several cycles. The surge is mainly due to the high voltage generated by the sudden unloading of large electric equipment connected to the electric network (such as the common household air conditioner when it is turned off) (we will all have this kind of experience: at night from 6:00 to 9: The time around 00 is the peak period of electricity use. The mains voltage is generally low. The lighting in the home is relatively dark. After a peak period of electricity use, for example, around 10:00 in the evening, you will find the lights in the home. Suddenly flashing and shining a lot, this is one of the most common surges we see in everyday life.)

2. High voltage spikes: These refer to voltage peaks of up to 6000 V and durations ranging from one-tenth of a second to one-half cycle (10 ms). This is mainly due to lightning strikes, arc discharges, static discharges or switching operations of large electrical equipment.

3. Switching transients: Pulse voltages with peak voltages as high as 20000V, but with durations ranging from one millionth of a second to one ten-thousandth of a second. The main reason and possible damage are similar to high-voltage spikes, but there are differences in the solution.


4. Power Sags (power sags): A low-voltage state in which the effective value of the mains voltage is between 80% and 85% of the nominal value and lasts for one to several cycles. Turning on large devices, starting large motors, or accessing large power transformers can all cause this problem.

5. Electrical line noise (electrical line noise): refers to radio frequency interference (RFI) and electromagnetic interference (EFI) and other various high-frequency interference. Motor operation, relay operation, motor controller operation, broadcast launch, microwave radiation, and electrical storms all cause line noise interference.

6. Frequency variation (frequency variation): It refers to the frequency change of the mains frequency exceeding 3Hz. This is mainly caused by the unstable operation of the emergency generator or by the power supply with unstable frequency.

circuit breaker

7. Brownout: The effective value of the mains voltage is lower than the rated value and lasts for a long time. The reasons for this include the start-up and application of large-scale equipment, the switching of main power lines, the start-up of large motors, and the overloading of lines (there are problems in many parts of our country).

8. Power fai1: The power outage that we usually encounter. The reasons for this are: tripping of circuit breakers on the line, interruption of utility supply, and grid failure.

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