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Questions tagged [arc]

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5
votes
3answers
238 views

In the recent Con-Ed transformer “fire”, what exactly produced the color of the huge blue glow over New York City?

Blue is often linked with technology (e.g. "big blue", glowing pools of water with Cherenkov radiation, aliens in general, Nobel prizes for blue LEDs) as well as traditional things like sparks. In a ...
0
votes
1answer
47 views

Transformer safety concern

I have a a transformer for my speaker (230VAC -> 9VAC). The primary of the transformer is basically a coil. Is it not dangerous to pull out the transformer from the outlet? I know that in coils if ...
0
votes
3answers
176 views

How to make an Arc welder out of 3500v bug zapper transformer?

I got a transformer from old bug zapper it has 3500v output , can I use it to make an Arc welder by removing the secondary windings and put 10 gauge wire windings instead. I saw some videos on ...
3
votes
3answers
121 views

how do electrical arcs occur?

I was under the impression that arcs form due to high voltage, that the breakdown of air was typically 3 million volts per meter. However, arc furnaces typically use low voltages, around 30 to 40 ...
1
vote
0answers
57 views

Can I use a capacitor to reduce arcing on a 12volt DC switch?

My first motorbike had a capacitor across the points. I was told it was to reduce arcing on the points and prolong their life. I use 2 micro-switches and diodes to reverse the direction of the 12 ...
18
votes
2answers
5k views

Why do fuses have a maximum breaking capacity?

Wikipedia told me that breaking capacity is the maximum current that can safely be interrupted by the fuse. I don’t understand why, if a small current can blow the fuse, a bigger current can’t. If the ...
0
votes
1answer
44 views

Are there disadvantages to this method of testing building wiring after a lightning strike?

A lightning strike can damage wiring in a building. Specifically it can damage the insulation on the conductors, resulting in arcing and fire, either immediately or some time after the strike. I've ...
1
vote
0answers
138 views

Circuit Breaker Simulation in Matlab with Mayr and Cassie Equations

I'm trying to understand how to model arc circuit breaker. There is a simulation example as called Mayr and Cassie Circuit in Matlab&Simulink. I have examined Mayr and Cassie Differential ...
15
votes
4answers
3k views

Why does only the tip of the electrode melt when arc welding?

I saw on youtube some people performing arc welding with "consumable electrodes". At a first glance, I saw that the current flows through all the electrode and the workpiece and my question comes from ...
2
votes
6answers
154 views

Why can closing a circuit breaker into a short circuit result in an arc flash?

NFPA 70E 130.6(M) states: After a circuit is de-energized by the automatic operation of a circuit protective device, the circuit shall not be manually re-energized until it has been determined that ...
-1
votes
2answers
132 views

Trying to limit 'arcing current' from battery to circuit [closed]

I am a novice in electronics. Doing it as a hobby. In one of my projects, I am facing an issue whereby I see arcing whenever I connect my 12V lead acid battery to my circuit. The reason I say this is ...
1
vote
2answers
111 views

Pool pump 20amp AC motor - significant inductive arcing when shutting off

My pool uses a 110V, 20 amp pump motor, specifically a Hayward Super Pump. Not sure on the HP rating but I believe it's the 1HP model based on the amperage. The pump uses a NEMA 5-20 plug, into a 20 ...
2
votes
2answers
317 views

Ignition coil arc initiation with protected low voltage continuation?

I'd like to initiate a spark plug arc with an ignition coil and then power the resulting (highly conductive) plasma with an ultracapacitor (low voltage, say 12V to 24V, and high current) without ...
1
vote
1answer
122 views

How possible is producing very high voltage and electric arc by a using this simple setup

I have the basic series RLC circuit in simulation below. As one can see in SPICE simulation, the output voltage at resonance frequency goes upto 1KV: Can I really obtain that much voltage as in the ...
0
votes
1answer
72 views

Arc Breakdown voltage

We all have seen experiments where an electric arc is created. Sometimes arcs of four inches are created with pretty rudimentary devices. When two electrodes are brought close together, a spark ...
-5
votes
3answers
92 views

Fear of electric arcs on a multiple outlet [closed]

I am physically near a multiple power outlet of the following model: The official page of the article is PowerCube |Extended| My doubt is: each outlet seems to close to each other. Should I fear ...
16
votes
3answers
2k views

Light bulb burns out — why there is an arc in the switch?

I use light bulbs (common incandescent) in the room and they burn out periodically, ca. one bulb in 4 months burns out. Very often, exactly at the moment when it happens, I see an arc (blueish light ...
0
votes
0answers
77 views

Mains switch arc - multiple smpsu inrush current

I am working on a design that consists of a mains power entry module which is a filtered, fused mains switch. This switches the live and neutral conductors to feed 4 switch mode power supplies. Each ...
0
votes
1answer
41 views

Radio Noise from Storm

I drove through a Wyoming thunderstorm today. Just for fun, I set my AM car radio to the top end of the AM broadcast band where there was no station audible. Sure enough, I heard the lightning ...
2
votes
2answers
263 views

high voltage igniter for carbon arc lamp

I know how a carbon arc lamp works, but knowing that an arc lamp of inert gas, ignited by a discharge of high voltage that ionizes the gas inside, I wonder if it would be possible to cause the ...
2
votes
2answers
96 views

How to prevent an arc when a device is plugged in

I have a device that takes arcs when I connect the power plug. It uses 24V. The 24V source is far awar so a 47uF cap is at the input. Charging this large cap causes a big zap every time. A 10Ω series ...
0
votes
0answers
217 views

How this electric lighter works?

I have seen this type of electric lighter : But I don't really understand why the electric arcs are crossing each other instead of going straight.How is it possible?
0
votes
3answers
872 views

Slayer Exciter : Aiming for Larger Arcs

I was recently building a larger slayer exciter. I've been trying out different coil ratios, coil materials, different transistors and many circuit variation, most of them just excited a fluoroscent ...
0
votes
2answers
342 views

Tesla Coil/Slayer Exciter : Aluminium or Copper wire?

I was making a slayer exciter recently and I ran out of copper while winding the secondary up, with a goal of 1300 turns.. I ran out of Cu wire, but I do have a lot of aluminium(37 AWG) wire(enamelled)...
2
votes
3answers
2k views

LED driver PT4115: how to avoid arc around IC pins?

I built a LED driver with PT4115 IC. The board lighted LEDs up but sparks appeared around SW, VIN & GND pins after 10 seconds and the phenomenon didn't damage the IC. I recorded it by my mobile ...
7
votes
3answers
7k views

How far can mains voltage arc in air?

I wondered this while soldering a mains voltage circuit board and was surprised by how close together the traces were. It has obvious implications in design of electrical plugs, and the proximity of ...
4
votes
1answer
160 views

What's causing bubbles in my transformer oil?

I've built a 2-stage Cockroft-Walton voltage multiplier with 10nF ceramic capacitors rated at 20kV each and pairs of 12kV diodes attached in series and hooked it up to an NST with a peak output of ...
18
votes
3answers
4k views

How can low voltage, high current (kA) power be dangerous?

Aluminum refineries use electricity to separate aluminum from minerals it naturally occurs in. This electricity typically takes the form of low voltage DC ("low" meaning 4 to 6 volts), at very high ...
0
votes
2answers
2k views

Increase Arc Lighter Spark Gap

This is a follow-up to my previous question. I am trying to increase the spark gap distance of an arc lighter without increasing the supply voltage - I'm using a 3.7V li-ion battery to power it. I'm ...
-1
votes
2answers
5k views

Why do cables not arc/spark when being removed or reconnected on a car battery terminal? [closed]

For example, when removing a car battery, the negative cable is to be removed first and reconnected last, but why does it not arc/spark in any of those scenarios? The circuit is complete, so why isn't ...
16
votes
9answers
11k views

Is it really possible to “boost” 6 V DC to above 50 kV? Or even 400 kV?

I am trying to create an arc generator and I have read about the marx generator but I am looking into more compact modules like the image below. All the ones I have found seem to be fake and actually ...
1
vote
1answer
744 views

DALI - ARC Power Control Commands - What about them is 'ARC' related

Commands used in DALI are described as ARC Power Control. If I am Directing an LED fitting to a particular dimming level, what about the command has any relevance to an 'ARC' description. Where does ...
-1
votes
1answer
54 views

3.16 amp arc enough to melt solder

So I was playing around and I hooked up a 19V 3.16A laptop charger to some clamps and a pencil lead...and stumbled upon carbon arc cutting. Now I'm wondering if this process can be used to solder non-...
0
votes
1answer
109 views

Is it possible to melt soft metals with household current?

I'm an electronics enthusiast with an interest in welding. Just out of curiosity, I was playing around with the voltage in my house (using proper safety techniques) and I started wondering if the arc ...
0
votes
1answer
93 views

Relay switching AC/DC plug pack

I have a relay that is switching 240V supply to a plug pack. The plug pack in turn supplies 24V to a solenoid coil. The relay has fused in the closed position and I'm trying to figure out why and the ...
0
votes
2answers
653 views

How to connect an LED indicator with a switch to this device? [duplicate]

I would like to know how can i add a safety switch with an LED indicator to the input of this device , so that if the safety switch is on then the LED lights , and when i want to use the device , all ...
-6
votes
3answers
254 views

Longest visible arc I can safely make with an alarm clock transformer

So I have an audio frequency transformer that turns standard US 120V power into two seperate 9V circuits: I got it from an alarm clock and want to create an arc with it, by turning it around and ...
0
votes
3answers
795 views

Easiest way to produce electric arcs from battery

In a chemistry project I want to pursue, I need to temporarily ionize air, which I aim to achieve with a continuous electrical arc jumping across two wires. I am a true novice when it comes to ...
2
votes
1answer
89 views

Is high temperatures breaking the circuit?

I was watching this video, where they were demonstrating the difference between breaking AC and DC current. https://www.youtube.com/watch?v=Zez2r1RPpWY When they try to break the DC current, an arc ...
1
vote
1answer
91 views

If a single contact in a parallel circuit shorts out, can it ark?

I am considering stress test scenarios for solderless battery packs, to know how much destructive impact they can handle before internal arcing can happen on individual batteries. If you have 200 ...
0
votes
2answers
546 views

Arc voltage on the relay's contacts when load is off

The contacts of the relay (not the coil of the relay) are connected in series with water boiler (2kW) and AC power socket (220V, 50Hz). Suddenly, relay stops its operation due to the electric arc ...
2
votes
4answers
2k views

Why does the cathode heat up more than the anode in an electric arc?

I have recently built a flyback transformer driver with a 555 timer, and have been drawing electric arcs. But I noticed that the cathode electrode(the HV pin on the transformer) heats up a lot more ...
-2
votes
1answer
383 views

How do plasma arc speakers work? Also, Bass? [closed]

Please see the following videos for examples of what I am asking about : https://www.youtube.com/watch?v=NeIAkKmUfn4 https://www.youtube.com/watch?v=rasp88nbsRw https://www.youtube.com/watch?v=...
4
votes
1answer
664 views

Does magnetism affect the likelihood of an electrical arc occurring?

Would magnetism affect the likelihood of an electrical arc occurring?
0
votes
1answer
84 views

240V AC to 30ish DC @ 40-200ish A [closed]

Alright so I will start with what I am trying to accomplish: So I want to build an power inverter based welder. I see these commonly in all new Lincoln and Miller welders. These all can change the ...
2
votes
1answer
145 views

How to measure relative light intensity (and ideally duration) of a xenon flashes, cheaply

I want to compare the light intensity (and maybe also duration) of multiple xenon flash designs. It does not have to give me the readings in any real unit, as long as it is linear (or mathematicaly ...
23
votes
4answers
4k views

How can a high-voltage transistor be in such small packaging?

For example: STN0214 - Very high voltage NPN power transistor It is said to accept more than 1 kV between its collector and emitter. It comes in a SOT-223 package (3 pins plus a tab). With a ...
0
votes
1answer
365 views

Can 0V from an isolated source arc to earth ground?

I have a high voltage bus bar (~300-400VDC) that is powered by a variac. This sits in a case that has other electronics that are powered by a step down transformer (120VAC to 24VAC, then rectified to ...
0
votes
4answers
2k views

Can I use a switch rated as 250VAC 25A to switch 50VDC 25A?

I am looking for a switch that can handle 25A continous current, the voltage will be maximum 50VDC, most often about 46VDC, and it will be used to switch on two dc-dc converters that have no load ...
8
votes
2answers
643 views

Understanding cause of arcing in AC filter circuit

I have an induction hot-plate that one day blew a fuse in my distribution panel when plugging it in. (With the obligatory smoke from the device of course) On visual inspection, only the AC filter ...