SPD for Power Supply

How does a surge protection system work?
The signal surge protector consists of five parts: discharge gap, inflatable
discharge tube, varistor, suppression diode and choke coil, which includes at
least one nonlinear voltage limiting element. The following is how each
component works.

1. Discharge gap. The discharge gap is generally composed of two metal rods
exposed in the air separated by a certain gap. When the instantaneous
overvoltage strikes, the gap is broken down and a part of the overvoltage
charge is introduced into the earth to avoid the voltage rise on the protected
equipment.

2. Gas discharge tube. The gas discharge tube is composed of a pair of cold
cathode plates separated from each other and encapsulated in a glass tube or
ceramic tube filled with a certain amount of inert gas (Ar).

In order to improve the trigger probability of the discharge tube, there is a
co-trigger in the discharge tube.

This kind of inflatable discharge tube has two-pole type and three-pole type.

3. Varistor. The main component of the varistor, the metal oxide semiconductor
nonlinear resistor, is considered to be very sensitive to the voltage when the
voltage at both ends of the varistor reaches a certain value. Its working
principle is equivalent to the series-parallel connection of several
semiconductors Pmurn.

4. Suppression diode. The suppression diode has the function of clamping and
limiting voltage, and it works in the reverse breakdown zone. Because of its
advantages of low clamping voltage and fast response, the suppression diode is
especially suitable to be used as the last stage protection element in the
multi-stage protection circuit.

5. Choke coil. The choke coil is a common-mode interference suppression device
with ferrite as the magnetic core. it is symmetrically wound on the same
ferrite annular core by two coils of the same size and the same number of turns
to form a four-terminal device. it has a large inductance for the common-mode
signal, but has little effect on the leakage inductance for the differential-
mode signal.

If you want to know more about single phase surge arrester price, please
contact us.

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protection devices for sale, if you have needs, please contact us.

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