Contents
What is trigger electrode?
The triggering electrode is most often mounted through a hole in the center of the positive main electrode. The undrilled main electrode is the negative electrode. When switching high currents, the electrodes undergo considerable heat stress, as they are directly involved in the electric arc.
How does a spark gap work?
In concept, a very basic spark gap transmitter consists of a voltage source fed through a resistor to a capacitor which has the spark gap across. The voltage across the gap rises until it sparks. The spark discharges the capacitance until it is below a sustaining voltage and the spark goes out.
Is a spark gap a capacitor?
Less sophisticated (and much less expensive) spark gaps are made using modified ceramic capacitors; in these devices, the spark gap is simply an air gap sawn between the two lead wires that connect the capacitor to the circuit. Larger spark gaps are used to protect power lines.
What is Trigation gap?
• A trigatron gap consists of a high voltage spherical electrode, an earthed main electrode of spherical shape, and a trigger electrode through the main electrode. • Tripping of the impulse generator is effected by a trip pulse which produces a spark between the trigger electrode and the earthed sphere.
What is a trigger tube?
Trigger tubes are basically similar to cold cathode diodes, but a third electrode known as a trigger or starter is employed in addition to the main anode and cathode. Trigger tubes are filled with an inert gas, often neon, at a fairly low pressure.
What is an impulse voltage?
[′im‚pəls ‚vōl·tij] (electricity) A unidirectional voltage that rapidly rises to a peak value and then drops to zero more or less rapidly. Also known as pulse voltage.
Are there two or three electrode spark gaps?
Even though two-electrode spark gaps can be triggered, the extra trigger electrode means that three-electrode spark gaps are usually called triggered spark gaps. There are many possible geometries of trigger electrodes. The two most common are the midplane and trigatron.
What is the trigger disk of a midplane triggered spark gap?
A midplane triggered spark gap has a trigger electrode in the form of disk halfway between the two main electrodes. Two resistors are used as a voltage divider between the main electrodes with the trigger disk tied to the middle of the divider.
How are spark gaps used in pulse generators?
A two-electrode spark gap can be used to speed up the output of a pulse generator. Spark gap pressure is held constant and you just wait for the pulse generator output to exceed the breakdown voltage predicted by Paschen’s law.
What are the geometries of trigger electrodes?
There are many possible geometries of trigger electrodes. The two most common are the midplane and trigatron. A midplane triggered spark gap has a trigger electrode in the form of disk halfway between the two main electrodes.