1MRS050729 ABB PCB control equipment automation

Description

One year, an expert from 1MRS050729 provincial electric power bureau visited a manufacturer, and the voltage of the booster was raised to about 900V,
A young man who had just graduated was assigned to work by an old man. The young man wore insulating gloves and stood on the rubber floor, making a comparison between the two manufacturers’ miniature circuit breakers. The arc light burst from the seam of the circuit breaker, one was light cyan, the other was orange.
It was the first time to see the halo. Except for the arc light sometimes seen on the socket, it was the first time to really touch the arc at close range.
The trouser legs are slightly damp.

Once again, 1MRS050729 went to a test station (now closed) to visit the limit breaking test of the circuit breaker. A thick wooden door is embedded with a window, through which the test bench can be seen.
The test bench is a piece of insulating plywood with a circuit breaker hanging on it. The circuit breaker is connected and in the opening position. A rope is tied to the handle and goes up through a pulley. The other end of the rope is outside the wooden door
So far, I still want to laugh. When I was preparing for the experiment, I shouted to lie down, and the elder sister who did the experiment smiled.
65kA, power of electricity.
Although I visited some high voltage and ultra-high voltage test equipment later, I always felt that it was not like an arc, but rather less awe inspiring than a low-voltage arc. hey.
Well, I admit my shortness.
Here are sensational notes.
All my arc knowledge
Although I have seen a lot of things about electric arc and checked a lot of materials in 1MRS050729, I found that it is enough to understand low-voltage electrical appliances as long as I know the following points over the years.
In fact, I didn’t remember much.
1. Arc is the breakdown of air medium. It breaks through the air and produces a very high temperature (some data say: about 3500 ℃). The contact, the copper contact bridge to which the contact is attached, the plastic around the contact, the oxide layer and spider silk will be vaporized at high temperature, and they will be mixed together to show the color of visible light according to their temperature. This is the arc.
2. Electric arc is a “conductor” passing through the current (this term is only used in places where terminology is avoided in communication)
3. Conductor will have resistance (arc resistance), voltage (arc voltage) at both ends, and of course, a parameter current. The process of the current rising from 0 to the maximum is a transient process, and the rising form is in the form of an exponential curve.
4. Arc will generate magnetic field. The arc is driven by a magnetic field. As a “conductor”, it complies with the left and right hand rules.

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