Surge Protection

The surge protection device (SPD) is a component of the electrical installation protection system. This has designed to protect electrical devices from voltage spikes. A surge protector can limit the voltage supplied to an electrical device by blocking or shortening the unwanted voltage above the safety limit.

The loads to protect this device are connected in parallel to the power supply circuit. It can use at all levels of the power grid. This is the most commonly used and most effective high voltage protection.

Common features

Uc: Maximum continuous operating voltage

The above A.C., which is SPD active. Or D.C. This is the voltage. This value is selected according to the rated voltage and the system earring configuration.

Top: Voltage protection level

This is the maximum voltage across the terminals when the SPD is active. This voltage is reached when the current flowing through the SPD is equal to in. The selected voltage protection level should need to less than the load-bearing high voltage. During lightning strikes, the voltage across the terminals of the SPD is lower than normal.

In: Nominal discharge current

This is the maximum value of the current in a wave of 8/20 waves and the SPD can discharge at least 19 times.

Users of electronic devices, telephone and data processing systems face the problem of keeping these devices active despite the unstable high voltages induced by lightning. There are several reasons for this, high-level electronic components make equipment more vulnerable, and disruption to service is unacceptable.

How it works?

There is a non-linear component in SPD under different conditions that transitions between high and low impedance state. In normal voltages, SPDs are in a high impedance state and don’t affect the system. When a transient voltage occurs, SPD moves into state condition while diverting the transient energy and current back to its source. 

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