[Home][2016 Index] Re: [TCML] Determining a transformer's voltage and current [Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# Re: [TCML] Determining a transformer's voltage and current

I strongly suggest a modification to this test, and that is to feed line voltage into the secondary and measure the resulting primary voltage. Safer and no chance of damaging the voltmeter.
```
Ed

On 4/16/2016 2:52 PM, Kurt Schraner wrote:
```
There are just 2 fundamental tests, which allow the determination of most importent transformer parameters: The open circuit test, and the short circuit test. In Jim Lux' HV-book you find a nice description of all what is needed; please click the following link:
```

Regards, Kurt

-----Ursprüngliche Nachricht----- From: Brian Hall
Sent: Friday, April 15, 2016 8:44 PM
To: Tesla Coil Mailing List
Subject: [TCML] Determining a transformer's voltage and current

```
I posted a question similar to this a couple weeks ago, but it was a bit cluttered or may have just gotten lost in the shuffle - there were no replies.
```
To simplify:
```
Given a 120v 60Hz primary high voltage transformer (looks like it could have come from a bug zapper or similar device), but there is no plate or markings indicating the HV output voltage, current, or manufacturer:
```
1) How could I determine the output voltage?
```
I got a cord and wire nuts, and hooked it up to 120v 60Hz AC to get a max spark of 1.8mm between the sharp ends of two bolts. What is the scale in mm for room temperature (20 degrees C) and still air on that max spark gap?
```
2) How could I determine the output current?

```
I have a variac and some decent power resistors, if putting in say 10 or 20 volts on the primary side, then a resistive load on the hv side would help along with Ohms Law for finding the current on the HV output. Just wondering if anyone else has encountered this and already knows how to find such answers, and has advice on how to determine with some degree of accuracy the HV side voltage and current values of an unmarked transformer.
```
----------------------------------
Brian Hall

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

```
```
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
```

• Follow-Ups: