| ??? 06/16/08 21:57 Read: times |
#155961 - Transformers Responding to: ???'s previous message |
Bill Johnson said:
Why is the transformer heating up? Because we live in an imperfect world! A perfect transformer, of course, would not heat up; but a real one has losses in both the windings and the core material - these losses turn up as heat. Why does the temperature change affect the transformer's output? Heat affects the properties of the materials (eg, the winding resistance increases) - so it's not surprising that the readings "drift". The heat from the transformer may also be heating other parts of your system - causing them to drift also. Once the system reaches thermal equilibrium (ie, stops heating up any further), you would expect the readings to stop changing, too! Any advice is appreciated. Your transformer manufacturer should be able to advise you what temperature rise should be expected as normal under your operating conditions. If the rise you're experiencing is normal, then you need to design for it; it it's not, you need to find the cuase of the problem! Have you asked the transformer manufacturer to review your system? |
| Topic | Author | Date |
| Voltage sense circuit drift problem | 01/01/70 00:00 | |
| Transformers | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
| You Could measure the Temperature | 01/01/70 00:00 | |
| You would have to measure! | 01/01/70 00:00 | |
| OFF load ?? | 01/01/70 00:00 | |
| AC Grid | 01/01/70 00:00 | |
| Sense mains voltage directly | 01/01/70 00:00 | |
| RE: get a proper voltage transformer | 01/01/70 00:00 | |
| isolation with a divider | 01/01/70 00:00 | |
| Load | 01/01/70 00:00 | |
| from the OP | 01/01/70 00:00 | |
| I hate transformer makers | 01/01/70 00:00 | |
| Time to get them in, then? | 01/01/70 00:00 | |
I made some experiences... | 01/01/70 00:00 |