High Voltage Engineering is a sub-field of Electrical Power Engineering. In this post you’ll learn about 5 Interesting HV phenomenon. You’ll also be able to watch these phenomena.
List of Contents
Singing Tesla Coil
The Tesla coil is a high-frequency transformer which was designed by Nikola Tesla. Tesla developed this coil to do research on X-ray generation, high-frequency alternating currents, and wireless power transmission.
Todays Tesla coil is used in HV Engineering for various tests as well it is used by hobbyists. You can also make your own small Tesla coil. A 60 kV coil is demonstrated with its singing in the video.
At very high voltages the ionization of electrons around the conductors of transmission lines produces a violet glow and ozone gas. Technically the phenomenon is known as corona discharge. Sometimes corona produces a hissing noise which can be noticed if you stand near a transmission line.
Pros: Corona on power line reduces the surge transients.
Cons: It results in loss of energy.
Sphere gap discharge
A sphere gap is widely employed in power engineering research for testing the voltmeters. You can use a sphere gap to measure:
- DC voltages
- AC voltages
- Impulse voltages
An interesting voltage discharge phenomenon occurs when two spheres are brought in close proximity. The figure below illustrates. In the video, you can observe sphere gap discharge at 100 kV.
Also learn: Difference between AC and DC Power transmission
Jacob ladder comprises two wires that are placed in nearly parallel (vertical) configuration. The distance between wires increases as we travel upwards. When HV is applied to gap a spark is formed in the bottom portion which then moves up. Ladder-like arcs in purple color is formed. You can observe a 30 kV Jacob ladder in the video.
In 1836 Michal Faraday observed that charge on a conductor had no impact on an object closed inside the conductor. The electric charges in Faraday cage are actually equally distributed and they cancel the field inside the cage. A Faraday Cage of 100 kV is demonstrated in the video.
Let’s watch the video: