Testing Transformer: What is the Top Metal Thing?

In summary, the metal thing on the top of the testing transformer is called a Corona Ring and it is used to reduce the effects of Corona, which is caused by high voltage gradients around sharp corners. It is typically made of hollow aluminum and is not actually spinning, but rather manufactured through a spinning process. This is in contrast to a lightning rod, which serves the opposite purpose. More information can be found by searching on Google.
  • #1
eric336
11
0
Hi everyone.

What is the metal thing on the top of the testing transformer (figure below)? It looks like electrode, but what is the use? I find it ubiquitous in many HV equipments.

Ac_Test_System_Hctt_Test_Transformer.gif
 
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  • #2
Corona Ring.
Usually a hollow aluminum spinning.
 
  • #3
At high voltages ( Starting around 1000V and becoming very pronounced > 100KV) the voltage gradient around sharp corners will cause the air to ionize, causing Corona. The rounded shapes help to reduce the effect. And to clarify CP's post, the aluminum is not spinning, that is the manufacturing process often used to make the ring. Google (as usual ) has some good info. - Also note how a lightning rod is physically the opposite.
 

FAQ: Testing Transformer: What is the Top Metal Thing?

1. What is the top metal thing on a testing transformer?

The top metal thing on a testing transformer is called the high voltage terminal. It is typically connected to the primary winding of the transformer and is used to apply the high voltage during the testing process.

2. What is the purpose of the top metal thing on a testing transformer?

The top metal thing on a testing transformer is used to control and measure the high voltage applied during the testing process. It also serves as a connection point for the primary winding of the transformer.

3. Is the top metal thing on a testing transformer dangerous?

Yes, the top metal thing on a testing transformer can be dangerous as it is used to apply high voltage during testing. It is important to follow safety precautions and proper procedures when working with a testing transformer to avoid electric shock.

4. Can the top metal thing on a testing transformer be replaced?

Yes, the top metal thing on a testing transformer can be replaced if it becomes damaged or malfunctions. However, it is important to use a replacement that is compatible with the transformer and to follow proper installation procedures.

5. How do I choose the right top metal thing for my testing transformer?

The top metal thing for a testing transformer should be chosen based on the voltage and current ratings of the transformer. It is important to consult the manufacturer's specifications and guidelines to ensure compatibility and safe operation.

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