More than 80% of the customers in the daily operation and maintenance of the company have encountered the following problems (you have encountered):
1. The equipment is shut down for no reason, causing production loss (such as sudden stop of the inverter; equipment damage after lightning strike; tripping of the circuit breaker;)
2, the equipment is running abnormally, can not find the cause (such as motor and cable heating; capacitor failure or even explosion; abnormal sound of the transformer;)
3. Equipment energy consumption increases, resulting in excessive electricity expenses
4, the production process is faulty, it is difficult to determine the responsibility (such as the relay protection device malfunction; PLC restart; product qualification rate decline)
(Always "headaches, feet and feet" Do you really find "lesions"? Do you realize that these problems may be related to power quality issues.
1) What is the quality of power?Power quality: also known as power quality, power quality, power quality; refers to the voltage, current or frequency deviation that causes the user equipment to malfunction or not work properly. Qualified power quality means that the power supplied to the sensitive equipment and the grounding system provided are suitable for the normal operation of the equipment.
Power quality includes: voltage quality, current quality, power quality, and power quality.
* Voltage quality: Undesirable supply voltage that affects the normal operation of the user equipment.
* Current quality: Disturbance of the load due to non-linear loads, fluctuations and shock loads.
2) Why is there a power quality problem?
1. Changes in electrical load structureSuch as the widespread use of power electronics technology, the popularity of household appliances, the large number of distributed power supplies, the development of high-speed railways, etc., due to its nonlinearity, impact and unbalanced power characteristics caused by the deterioration of power quality. The most important thing is the large number of non-linear equipment. Note: A non-linear load is the load that contains the rectifying device. In electronic circuits, voltage and current are not linear.
2. Equipment is becoming more sensitiveThe popularity of computers, the development of IT industry, the application of microelectronic control technology, production automation, scale, and refinement have led to higher and higher requirements for power quality and power supply stability, and the problems faced are becoming more and more severe.
("symptoms") five common power quality problems
1. Harmonics: Harmonics are usually caused by the operation of non-linear loads, such as inverters, computers, UPS, LED lights, etc.
2. Voltage sag / spurt / interrupt: mainly caused by external and internal reasons, grid short circuit fault, lightning strike, switching operation and capacitor switching; or large equipment start, shutdown or impact load operation.
3. The main cause of three-phase unbalance is the uneven distribution of single-phase loads in three-phase systems or large-capacity single-phase loads such as electric welders, lighting systems, railway locomotives, and computer power distribution systems.
4. Transient: It may be caused by lightning, or it may be caused by switching operations such as switching capacitor banks.
5.
Flicker: The main reason is the amplitude fluctuation of the power supply voltage. Such as electric arc furnaces, rolling mills, washing machines, etc., will cause flicker.
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