The application of
overvoltage and undervoltage protectors has shown a significant growth trend. Nowadays, due to the substantial increase in the total number of electrical appliances, while the distribution equipment remains unchanged, the distribution equipment is aging, the geographical environment is becoming increasingly extreme, substandard products are passed off as genuine ones, there are counterfeit and substandard products with poor quality, and cable cutting is rampant.
In addition
due to the accidental operation of electrical appliances, voltage imbalance is inevitable. Multiple factors cause voltage mutations ranging from 0 to 450V. Therefore, the unexpected and unexplained burning of electrical appliances is also a specific situation.
The overvoltage and undervoltage protector can be set arbitrarily. When modifying the data of the product, it is necessary to indicate. The setting is convenient and the data can be modified. The operation should be carried out according to the set data. If it is indicated that only the reference voltage can be used and the operation cannot be carried out, then the indication is not related to maintenance and therefore cannot be fraudulently claimed. It is important that it can truly exert its protective function. The grid voltage can usually be used, but this does not mean that it can exert its protective function when the grid voltage undergoes genetic mutations.
How to determine the effectiveness of the overvoltage and undervoltage protector:
(1) The voltage protection device itself should be capable of handling communication and alternating current voltages of 450V or higher. As the grid voltage sometimes drops to approximately 400V when the neutral is disconnected, this has already been measured. Before installation, the protection device must ensure that the welder immediately connects to the two live wires and the neutral wire, and remains connected for 4 hours to determine if the protection device itself can handle it. Of course, we cannot ignore whether it can work normally at low voltages. You can use an AC stabilizer or a 60V range detector to determine this.
(2) The protection device should set the power-off maintenance value based on the rated voltage of the maintained electrical appliance. In China, the single-phase power distribution voltage requirement is 220V, with a deviation not exceeding ±10% for the positive and negative poles. Generally, the rated voltage of the appliance is designed according to national regulations. Naturally, there are some appliances whose rated voltage is ±15% for the positive and negative poles, and also ±5% for the positive and negative poles. Everyone knows that the most important thing for an appliance is to prevent excessive voltage or low voltage. If it exceeds the rated voltage, insulation strength and pressure resistance values will be penetrated and damaged, causing fire accidents and serious harm to assets and personal safety. As long as this function is achieved, it can be determined by the protection device itself.
(3) The voltage change is caused by a genetic mutation and it occurs very quickly. The protective device’s response must also be quick. The faster, the better. Try this out. Check it several times to see if the power cuts off immediately.
(4) The overvoltage and undervoltage protector should be set to switch on and off based on the characteristics of the maintained electrical appliances. This is of crucial importance. Some electrical appliances cannot be plugged in immediately after power loss, such as central air conditioners and refrigerators, which usually require more than 5 minutes before they can be plugged in. **It is necessary to determine the timing switch for the delay time and implement it within a clock cycle.
Whether it’s self-repairing, delay time, fully automatic, zero-break, reclosing, drive belt indication, overvoltage and undervoltage protectors, or electrical equipment protection devices, all are voltage protection devices. They perform maintenance based on the operating voltage and are also called protection devices. As long as it is a genuine new product, normal and properly applied, generally there won’t be any problems.
