Medium Voltage Circuit Switching

In summary, the conversation discusses the need for controlling a Hi-Pot and multiplexer using switches while protecting the multiplexer from a high voltage of 4800VAC. The switches must be able to withstand at least 4800VAC when open or closed for the Hi-Pot and 600VAC when closed and 4800VAC when open for the multiplexer. The suggestion of using IGBT is dismissed due to its limitations, and it is recommended to use relays with 3-4 contacts in series to achieve the required voltage isolation. A grounding relay can also be added for additional protection.
  • #1
recalli349
1
0
I have attached a picture of a circuit. It is a Hi-Pot applying 4800VAC on a transformer. I would like to control the Hi-Pot and multiplexer by using switches while at the same time protecting the multiplexer from having 4800VAC applied across it. I have been researching for a while and I do not know still what is the best type of switching to use. The switches connected to the Hi-Pot must withstand at least 4800VAC when open or closed, and the switches connected to the muliplexer must be able to withstand at least 600VAC when closed and 4800VAC when open. The current in both situations is negligible. The switches, as shown in the circuit, must be controllabe remotely. Any help would be appreciated.
 

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  • #2
Look up IGBT
 
  • #3
Don't think an IGBT will do the trick, they are generally not good at reverse blocking - as this is AC and at 4800VAC you need almost 10KV blocking - Since you should not be switching any load with this some basic relays will probably work - you can use 3-4 contacts in series to get the V isolation you need. 4 Contacts rated at 600 VAC will work. You can also add grounding relay of the same type.
 

Related to Medium Voltage Circuit Switching

1. What is medium voltage circuit switching?

Medium voltage circuit switching is the process of controlling and regulating the flow of electricity in a circuit with a voltage level of 1000 volts to 100000 volts. This type of circuit switching is commonly used in power distribution systems and industrial applications.

2. How does medium voltage circuit switching work?

Medium voltage circuit switching works by using a switch to open or close a circuit. This switch can be manual or automated and is designed to handle high voltage levels. When the circuit is closed, electricity is able to flow through the system. When the circuit is open, the flow of electricity is stopped.

3. What are the different types of medium voltage circuit switches?

There are several types of medium voltage circuit switches, including air break switches, vacuum switches, and SF6 gas switches. Air break switches use air as the insulation medium, vacuum switches use vacuum to interrupt the circuit, and SF6 gas switches use sulfur hexafluoride gas for insulation and interruption.

4. What are the advantages of medium voltage circuit switching?

One of the main advantages of medium voltage circuit switching is its ability to handle high voltage levels and heavy loads. It also allows for the efficient and reliable distribution of electricity in power systems. Additionally, medium voltage circuit switches have a longer lifespan and require less maintenance compared to low voltage switches.

5. What are the safety precautions for working with medium voltage circuit switches?

Working with medium voltage circuit switches can be dangerous, so it is important to take proper safety precautions. This includes wearing personal protective equipment, following proper lockout/tagout procedures, and receiving proper training on how to handle and operate the switches. It is also important to regularly inspect and maintain the switches to ensure their safe operation.

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