DC surge protector principle Surge protector protection use

Switch type: Its working principle is that when there is no instantaneous overvoltage, it presents a high impedance, but once it responds to lightning instantaneous overvoltage, its impedance suddenly changes to a low value, allowing lightning current to pass. When used as such devices, the devices include: discharge gaps, gas discharge tubes, thyristors, etc.

1.2. Voltage limiting type: Its working principle is that when there is no instantaneous overvoltage, it is high resistance, but with the increase of surge current and voltage, its impedance will continue to decrease, and its current-voltage characteristic is strongly nonlinear. Devices used for such devices are: zinc oxide, varistor, suppressor diode, avalanche diode, etc.

3. Shunt type or choke type

Shunt type: connected in parallel with the protected equipment, it presents low impedance to lightning pulses and high impedance to normal operating frequencies.

Choke type: connected in series with the protected equipment, it presents high impedance to lightning pulses and low impedance to normal operating frequencies.

Devices used as such lightning arrester devices include: choke coils, high-pass filters, low-pass filters, 1/4 wavelength short-circuiters, etc.

Surge protector is an electronic device that provides safety protection for various electronic equipment, instruments and communication lines. When a surge current or voltage is suddenly generated in an electrical circuit or communication line due to external interference, the surge protector can conduct the shunt in a very short period of time, thereby avoiding the damage of the surge to other equipment in the circuit.

The purpose is to further limit the value of the residual surge voltage through the first-stage lightning arrester to 1500-2000V, and implement equipotential bonding for LPZ1-LPZ2.

As the second-level protection, the power surge arrester output by the distribution cabinet line should be a voltage-limiting power surge arrester, and its lightning current capacity should not be less than 20KA. Circuit Distribution Office. These power surge arresters can better absorb the residual surge energy that has passed through the surge arrester arrester at the user's power supply inlet, and have an excellent suppressing effect on transient overvoltage.

The purpose is to protect the equipment by reducing the residual surge voltage to less than 1000V, so that the surge energy will not damage the equipment.

When the power lightning arrester installed at the AC power inlet end of the electronic information equipment is used as the third-level protection, it should be a series-type voltage-limiting power supply lightning protection device, and its lightning current capacity should not be lower than 10KA.

A built-in power lightning arrester can be used in the internal power supply of the electrical equipment to completely eliminate the tiny transient overvoltage. The maximum impulse capacity required by the power lightning arrester used here is 20KA or lower per phase, and the required limiting voltage should be less than 1000V. It is necessary to have the third-level protection for some particularly important or sensitive electronic equipment, and it can also protect the electrical equipment from the transient overvoltage generated inside the system.