Tagged Questions

0
votes
1answer
89 views

Effect of an isolation transformer on leakage current

How do isolation transformers affect the leakage current through protective earth in a system? Scenario 1: Mains is directly connected to circuit. Metal enclosure has a protective earth connection ...
0
votes
1answer
87 views

Ground Fault Question Regarding a 3 Phase Circuit

I'm needing to design a 3 phase ground fault detection system for a 480V system. It will need to be able to trip when there's ground fault current >1A. I have done some reading and it sounds like ...
6
votes
1answer
405 views

Center tap split supply question

Lest's say that I have the following setup: a split supply (using two voltage regulators: a positive and a negative one) connected to a center tapped transformer (12-0-12). The output of the ...
0
votes
1answer
312 views

Multi-tap transformer current handling capability

I have a transformer with a single secondary winding but with multiple taps, as shown in the image. It is rated at 4A @ 24V (96VA). Does this mean that at lower voltages (16V and 8V) it will be able ...
1
vote
2answers
405 views

Current draw and VA ratings

I am wondering if a 12VA transformer (10:1, from 120 -> 12VAC) can draw more than one amp on the secondary side? Just my thought process: 1A on primary @ 120VAC will be 10A @ 12VAC, if I am correct ...
3
votes
3answers
285 views

Why doesn't a high current transformer get damaged when shorted?

In this video a high-current transformer secondary coil is shorted with numerous thick pieces of metal - pieces of rather thick wire and a knife blade. All those pieces either get red-hot or just ...
-1
votes
2answers
267 views

Serious step-up current?

I have: (1 x 220V~550W/2.5A 50Hz induction generator), (1 x 220V~176W/0.80A 50/60Hz step-up to 4000-0-4000V 20mA 20.000Hz dimmable, neon sign transformer) and (1 x 220v~ step-down transformer from a ...
1
vote
2answers
257 views

How do I protect against voltage surges from sensors?

I'm attempting to use a CT to measure AC current. I got a lot of information in this answer to another question which led me to huge amount investigation. I want to measure the current in use by an ...