1) The reaction time refers to the time from when the applied voltage exceeds the breakdown voltage to the breakdown phenomenon occurs. The reaction time of the gas discharge tube is generally on the order of μs.
2) Power capacity refers to the maximum energy that a gas discharge tube can withstand and radiate, which is defined as the current that can withstand and radiate under a fixed 8×20 microsecond current waveform.
3) The capacitance refers to the capacitance between the two electrodes of a gas discharge tube measured at a specific frequency of 1 MHz. The electric capacity of the gas discharge tube is very small, generally ≤1 picofarad.
4) DC breakdown voltage When the applied voltage rises at a rate of 500 volts per second, the voltage at which the discharge tube generates spark is the breakdown voltage. The gas discharge tube has a variety of different specifications of DC breakdown voltage, and its value depends on factors such as the type of gas and the distance between the electrodes.
5) Temperature range The operating temperature range is generally between -55°C and +125°C.
6) Insulation resistance refers to the resistance of the gas discharge tube measured when 50 or 100V DC voltage is applied, generally> 1010 ohms.
Technical parameters of gas discharge tube(1) DC discharge voltage
Under the action of a voltage with a steep rise below 100 volts per second, the average voltage value at which the discharge tube begins to discharge is called its DC discharge voltage. Due to the dispersiveness of the discharge, it is necessary to give the upper and lower limits of the allowable deviation at the same time around this average value.
(2) Impulse discharge voltage
Under the action of a transient voltage pulse with a prescribed rising steepness, the voltage value at which the discharge tube begins to discharge is called its impulse discharge voltage. Since the response time or action delay of the discharge tube is related to the rising steepness of the voltage pulse, the impulse discharge voltage of the discharge tube is different for different rising steepness.
(3) Power frequency withstand current
The discharge tube passes the power frequency current 5 times, and the maximum current at which the tube's DC discharge voltage and insulation resistance does not change significantly is called its power frequency withstand current. When applied to some AC power supply lines or communication lines that are susceptible to power supply line induction, attention should be paid to the power frequency tolerance of the discharge tube. Experience has shown that the induced power frequency current is small, generally not greater than 5 amperes, but its duration is very long; the overcurrent on the power supply line is very large, up to hundreds of amperes, but due to the action of the relay protection device, it continues The time is very short, generally not more than 5s.
(4) Impulse withstand current
The maximum current peak value at which the discharge tube passes through the specified waveform and the specified number of pulse currents so that the DC discharge voltage and insulation resistance will not change significantly is called the impulse withstand current of the tube. This parameter is always given under a certain waveform and a certain number of passes. The manufacturer often gives the impulse withstand current for 10 passes under the 8/20 microsecond waveform, and also gives it at 10/1000 microseconds. The impulse withstand current flows 300 times under the waveform.
(5) Insulation resistance and capacitance between electrodes
The insulation resistance of the discharge tube is very large. The parameter value given by the manufacturer is generally the initial value of the insulation resistance, which is about several thousand megaohms. During the continuous use of the discharge tube, the insulation resistance value will decrease. The reduction of the resistance value will cause the leakage current in the pipe to increase during the normal operation of the protected system, and it may also cause noise interference.
The inter-electrode parasitic capacitance of the discharge tube is very small. The inter-electrode capacitance of the two-electrode discharge tube is generally in the range of 1 to 5 picofarads. The value of the inter-electrode capacitance can remain approximately unchanged in a wide frequency range. The dispersion of the capacitance value between the electrodes is very small.
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