Introduction: Thunderstorm is a normal weather phenomenon, we can not prevent its occurrence, but can use some protective measures to prevent. We know that lightning weather is not safe, many electrical appliances in the improper use of the time will lead to malfunctions and accidents, endangering people's health. The power supply system in the lightning weather will also be affected, bringing the internal surge, a dangerous situation, the surge protector can prevent the generation of surge phenomenon. This article will introduce you to the role of the surge protector.
Lightning discharges may occur between clouds or inside the clouds, or between the clouds to the ground; in addition to the use of many high-capacity electrical equipment to bring internal surges, the impact of the power supply system and power equipment and lightning and surge protection.
For low-voltage power supply system, surge caused by transient overvoltage (TVS) protection, it is best to use graded protection to complete. Starting from the entrance of the power supply system gradually surge energy absorption, transient overvoltage inhibition in stages.
The first line of defense
Should be connected to the user's power supply system inlet into the various phases of the earth between the large-capacity power supply anti-surge protector. Generally require the level of power protectors with 100KA/phase above the maximum impact capacity, the required limiting voltage should be less than 2800 V. We call CLASS?I power surge protector (SPD for short). These power supply surge protectors are designed to withstand the high currents and high energy surge energy absorption of lightning and induced lightning strikes by shunting large amounts of surge current to earth. They provide only a medium level of protection with voltage limitation, since the CLASS?I protectors are primarily for the absorption of large surge currents. They are not able to fully protect sensitive equipment within the power supply system.
The second line of defense
Should be installed in the important or sensitive power equipment to the power distribution equipment at the branch circuit power surge protector. These SPDs provide better absorption of the residual surge energy that passes through the customer's power inlet surge discharger and provide excellent suppression of transient overvoltages. The power supply surge protectors used here require a maximum surge capacity of 40KA/phase or more, and the required limiting voltage should be less than 2000 V. We call them CLASS?II power supply surge protectors. General users of the power supply system to the second level of protection can achieve the requirements of the operation of electrical equipment.
Last line of defense
Can be used in the internal power supply part of the power equipment using a built-in power surge protector to achieve the complete elimination of small transient transient over-voltage purposes. The use of the power supply surge protector requires the maximum impact capacity of 20KA / phase or less, the required limiting voltage should be less than 1800 V. For some particularly important or sensitive electronic equipment, with the third level of protection is necessary. It also protects the electrical equipment from transient overvoltages generated within the system.
Accidents happen all the time around us, but in thunder and lightning, they happen rather more often. Not only will there be accidents caused by natural phenomena, but many electrical appliances will also be affected, harming the innocent. Power supply system in thunderstorms, lightning discharge, will make the internal surge phenomenon, but this will cause accidents, with a surge protector surge protection against lightning, can reduce the incidence of accidents. This article describes the role of the surge protector, hope to cause more people to pay attention to safety.
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