Switching surges are overvoltages that occur during lightning, switching, charging/discharging, and switching. These overvoltages can have a negative impact on the insulation of power systems .

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• What is a Surge? Surge refers to the shock voltage/current that occurs due to lightning, switching, charging/discharging, etc.

• A voltage that causes a sharp change in waveform within a short period of time. If a surge is not reduced in time after it occurs, it can damage the circuit or cause a power outage.

• Since modern power systems operate on an organic structure, even a small surge can affect the entire system .

• What is an opening and closing surge? An opening and closing surge is a surge that occurs when opening and closing a circuit breaker, and occurs when operating a power transmission line or circuit breaker.

• It is divided into input surge and opening surge, and as it can reach several times the transmission voltage, the insulation design of ultra-high voltage transmission lines is designed based on the opening and closing surge .

• Why is it important? Surges can cause circuit breakers to malfunction. Small surges can cause errors or damage to communication systems and automatic control systems, which can have a fatal impact on the process. Therefore, it is necessary to install surge protection devices (SPDs) to protect the power system.

• How should I respond? When installing additional backup devices to absorb surges or using circuit breakers with high shunting power, surge countermeasures should be taken into consideration in the design. In addition, by performing periodic maintenance on wires and electrical devices, defects such as aging can be prevented in advance, and a quick response can be achieved by installing circuit breakers and surge protectors .

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