{"id":638,"date":"2021-06-17T20:52:16","date_gmt":"2021-06-17T20:52:16","guid":{"rendered":"https:\/\/highenergydevices.com\/?page_id=638"},"modified":"2023-02-22T12:02:46","modified_gmt":"2023-02-22T12:02:46","slug":"glossary-of-common-spark-gap-terms","status":"publish","type":"page","link":"https:\/\/highenergydevices.com\/glossary-of-common-spark-gap-terms\/","title":{"rendered":"Glossary of Common Spark Gap Terms"},"content":{"rendered":"\t\t
Arc Voltage:<\/span> Capacitance (C):<\/b><\/span> Cutoff Voltage:<\/span> DC Breakdown Voltage:<\/b><\/span> Electromagnetic Pulse (EMP):<\/b><\/span> Follow-On Current:<\/b><\/span> Insulation Resistance (IR): <\/b><\/span> Nuclear Electromagnetic Pulse (NEMP):<\/b><\/span> Peak Discharge Energy: <\/b><\/span> Pulse Breakdown Voltage: <\/b><\/span> Rise-time (tr): <\/b><\/span> Transient: <\/b><\/span> Transition Time: <\/b><\/span>
<\/b>The arc is a self-sustained discharge that has a low voltage drop (typically 20-40 volts) and is capable of supporting currents of thousands of amperes. In a spark gap, the arc is established by transition from the dc breakdown or glow voltage to the arc mode. When an arc occurs in a spark gap between two refractory electrodes such as Tungsten, very high temperatures are created at the surface of the electrodes and rapid vaporization (erosion) of the electrode occurs.<\/span><\/p>
The electrical characteristic which permits the storage of electrical energy in the electrostatic field between two conductors. The amount of charge that can be stored by a capacitor is measured in farads.<\/p>
<\/b>The voltage level below which the application of a trigger pulse fails to achieve gap breakdown. The normally recommended range of operation of the applied voltage of a triggered spark gap is between 50 – 80% of the main static breakdown (MSB).\u00a0 Operation at lower applied voltages may be obtained; however the probability of a misfire increases at lower voltage levels.<\/p>
Voltage at which the spark discharge occurs when the voltage across the gap is increased slowly. A ramp rate is usually specified with a typical value of 1000 volts per second.<\/p>
A short duration pulse of electromagnetic energy from an unspecified source. This event is primarily associated with a nuclear explosion.<\/p>
The follow-on current may occur in either a DC or AC circuit.\u00a0 In an AC Circuit, after occurrence of a transient voltage at the end of each half cycle, there is a period in which the current is nearly zero. In this period, there is a very rapid deionization and the current will extinguish. As the voltage reverses, if the current continues to flow it is known as follow-on current.\u00a0 In DC applications, it is essential to insure that the protector will be extinguished after the transient has passed in order to be able to protect against reoccurring transients.<\/p>
The resistance between the electrodes of a spark gap which is not ionized. The measurement is commonly made at 100 Volts.<\/p>
The electromagnetic pulse originated from the explosion of a nuclear bomb.<\/p>
The maximum stored energy that a gap can dissipate per firing, during intermittent duty, without permanently changing its breakdown rating by more than 10%. The principal effect of excessive peak energy is electrode erosion and glass rupture.<\/p>
Voltage at which the surge arrester ionizes when subjected to a fast rising voltage such as (dv\/dt = 10kV\/\u00b5s).<\/p>
The time required for the initial edge of a voltage or current waveform to go from 10% to 90% of the peak value.<\/p>
A sudden change or pulse that is not intended in a circuit.<\/p>
The time interval between the instant when the spark gap breaks down and the establishment of the arc voltage.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t