How to analyze a High Voltage Transformer
Generally, Transformers convert voltage for make use of in appliances. High- voltage or "step-
up" transformers twist lower voltages into higher voltages. A high voltage transformer is a type
of electrical transforme r. An appliance similar to microwaves utilizes high- voltage
transformers. As they cause a risk of shock, the transformer must be detached, and the capacitors
bled, prior to testing. With a willingly accessible resistance tester, however, the entire procedure
becomes trouble- free, fast and extremely informative. Knowing how the transformer functions
helps recognize what the outcome of the tests mean. It will resolve whether the transformer itself
is faulty, or if it is operating appropriately.
1. Detach the transformer from its power supply.
2. Consent to power to exhaust from the capacitors. If the division utilizes high- voltage
capacitors without exhaust resistors, it may be essential to short-circuit the capacitors. If
not, just agree to the resistors to consume power from the capacitors on their individual.
3. Check that the component has no control with the voltmeter.
4. Cut off the high voltage transforme r guide from its valve on the transformer suitable.
This may engage just unplugging the wire, or it may need that a set screw be detached. If
there are several high- voltage valves, separate each of them now.
5. Place the ohmmeter to its most responsive. Analysis for resistance among the terminal
just detached and the earth. The indicator should exhibit everywhere connecting about
fifty to about seventy ohms (50-70 Ω) of resistance stuck between these two points.
Considerable variance from this series indicates an imperfect transformer.
6. Divide the guide to the key in terminals on the transformer, subsequent to the similar
method as for the high-voltage outputs.
7. Check with the ohmmeter connecting each input terminal. The meter should present a
very low down reading (close up to zero ohms (0 Ω)) among these terminals. Also a great
deal resistance stuck between these terminals specifies a fault in the transformer.
8. Test between all of the input terminals and the ground. The ohmmeter be supposed to
illustrate infinite ohms (∞ Ω), representing no relationship at all between these points.
Some finite resistance here designates a short circuit.
9. Detach the low-voltage productivity escorts, and test for resistance between those
workstations. The ohmmeter should show a low, finite evaluation (less than one Ω), as
with the key in terminals. In excess of resistance there shows a difficulty with the
10. At last, test between the low-voltage productivity terminals and the position. The
measuring device should demonstrate infinite ohms (∞ Ω), signifying no connection at
all. Once again, any link here specifies a short circuit.
11. If the entire resistance readings appear proper, clean off the workstations and reconnect
the guide, then reconnect the transforme r. The analysis indicates that any troubles with
the system lie down elsewhere.
Source: electrical transformer