Absorption circuit

tangwei8802429

Absorption circuit [Copy link]

 

The machine casing is leaking electricity, but the 220V ground wire in the room is not connected to the ground. Can you tell me what circuit should be added to absorb it? The current is very small.

qwqwqw2088

No matter how small the current is, connect the ground first.

If you know that the machine casing is leaking electricity, connect the ground first

maychang

[The machine casing is leaking electricity, but the 220V ground wire in the room is not connected to the ground. What circuit should I add to absorb it? ]

No matter what circuit you add, it won’t absorb it.

If there is no ground wire in the room, open the wall socket box to see if there is a ground wire. If there is no ground wire, you can connect it to the water pipe in the room (if it is an iron pipe) or the heating pipe. If there is no water pipe, dig a hole in the room and bury one.

To solve the problem fundamentally, you should change your [machine] into an insulating shell.

qwqwqw2088

The leakage absorption circuit uses a bidirectional TVS diode to absorb a certain amount of leakage current.

Or, install a circuit breaker with leakage protection function. When leakage current is detected in the casing, the protector will automatically cut off the power supply to protect personal safety.

qwqwqw2088

Also, it is used in the laboratory, isolation transformer

tangwei8802429

qwqwqw2088 posted on 2024-7-11 15:55 The leakage absorption circuit uses a bidirectional TVS diode to absorb a certain amount of leakage current. Or, install a circuit breaker with leakage protection function, when detecting...

How do I connect this? If the power supply is directly connected to the ground, it will not be pulled to 0V, right?

tangwei8802429

maychang posted on 2024-7-11 15:53 [The machine casing is leaking electricity, but the 220V ground wire in the room is not connected to the ground. Can you tell me what circuit should be added to absorb it? ] What circuit can also [ ...

Thank you for taking so much trouble...

maychang

tangwei8802429 posted on 2024-7-11 16:25 Thank you, it’s so troublesome... ...

【Thank you for taking so much trouble...】

If you find it troublesome, you can follow the suggestion of qwqwqw2088 on the 4th floor and add a leakage protector at the entrance of the AC mains. This can ensure personal safety.

tagetage

Why do some people always ask what to do without standard premise?

It's like someone asked, "I like to drink dichlorvos, what medicine can I take to detoxify it?" The most correct way is not to drink dichlorvos.

The formal solution to the problem you asked is to connect the ground wire of the room.

qwqwqw2088

tangwei8802429 posted on 2024-7-11 16:20 How should I connect this? If the power supply is directly connected to the ground, it will not be pulled to 0V, right?

You can connect it in any way you want in both directions. This method does not solve the problem completely. TVS mainly absorbs instantaneously and can only absorb part of it.

Because your equipment is leaking electricity, just connect the ground properly. Or the water pipes and heating pipes are indeed OK.

If the room does not have an existing grounding system, you will need to hire a professional electrician to install one.

振动试验仪器

maychang posted on 2024-7-11 17:04 [Thank you, it’s so troublesome... ...] If you find it troublesome, you can use the suggestion of qwqwqw2088 on the 4th floor and add a leakage protection at the entrance of the AC mains...

Adding leakage protection is really not a good idea. The leakage protection switch will trip from time to time, and the equipment will not be able to operate. The only solution is grounding.

maychang

Vibration Test Instrument Published on 2024-7-12 02:55 Adding leakage protection is really not a good idea. The leakage protection switch will trip from time to time, and the equipment will not be able to operate. Only grounding is possible.

Please don't reply to my posts in the future.

秦天qintian0303

Shouldn't the leakage problem be solved?

吾妻思萌

Why do some people always ask what to do without the standard premise? ? It's like someone asked, I like to drink dichlorvos, what medicine can I take to detoxify? The most correct way is not to drink dichlorvos. The formal solution to your question is to connect the ground wire of the room.

It makes sense hahaha grounding grounding grounding, it must be grounded

langtuodianzi

Usually, when electronic equipment is used, it is often accompanied by strong current equipment such as power supplies, and all electronic equipment needs to be grounded.

Grounding has two purposes: one is to provide safety protection for equipment operators; the other is to improve the working stability of the equipment.

beyond_笑谈

I've seen an iron pole inserted into the ground outside a house and connected to it with an iron wire for grounding.

Building grounding is also done by digging a pit, burying a metal pole, and leading it out for grounding

tangwei8802429

qwqwqw2088 posted on 2024-7-11 17:22 It doesn't matter how you connect the two-way connection. This method is not a complete solution. TVS mainly absorbs instantaneously and can only absorb part of it. Because your device is leaking electricity, the ground...

I found that it was much better after connecting the switch power supply shell.

qwqwqw2088

When the 220V ground wire is not connected to the ground, the metal casing of the machine may have a certain potential. Although the current is small, there will be a slight electric shock. This
is because the leakage current has no suitable path to flow to the ground.

The machine casing is grounded, and the leakage current can flow to the earth through the casing and the ground wire, reducing the possibility of electric shock to the human body and ensuring safety. It also complies with the regulations

chunyang

That cannot be called "absorption". When you encounter the problem of electrical casing being charged, you must first find out the cause of the charge. If it is a real leakage, that is, when the impedance between the casing and the live wire of the power grid is low enough, it is very dangerous, indicating that there is a fault in the equipment and it needs to be eliminated before it can be used again. If it is a "leakage" in the general sense, that is, the leakage between the casing and the live wire is of high impedance, such as leakage when the casing of a desktop computer is not grounded, then the solution is reliable grounding. Today's buildings, including factories, office buildings, commercial buildings and residences, have mandatory requirements to lay reliable grounding loops. As long as the power supply network is constructed according to specifications, there will be no leakage problems.