Transformer Turns Ratio Test - Protec Equipment Resources

[@soe2152]

Thank you for sharing. learn a lot.

[@ProtecEquipmentResources]

Glad it was helpful!

[@ukown3839]

Very informative! Where can I find more?? 😁

[@ProtecEquipmentResources]

Thanks! You can try this video from Tom Sandri from our April 2022 webinar Transformer Testing: Sweep Frequency Response Analysis: kzbin.info/www/bejne/p2eTg5x9hNOhr8k

[@abdullahdawdy7084]

It was a good video Practically & Theoretically Thanks a lot!!

[@ProtecEquipmentResources]

Glad you liked it!

[@BretHammonds]

@@ProtecEquipmentResources I’m not sure that I understand your question. However, let me see if I can respond in a meaningful way. Are you talking about the voltage drop across the primary winding as a result of its resistive and inductive characteristics? The test equipment measures both the primary and secondary voltages associated with performing a transformer turns ratio test. If there is some reason for a reduced voltage on the primary winding, the secondary voltage should be impacted proportionally. So, if for some reason the output voltage of the test set is less than the expected value, and if a required level of magnetic flux can be maintained in the core of the transformer, then the ratio will be the same even at a lower voltage. The specified error of the test equipment should be far less than what the industry requires in terms of acceptable ratio errors.

[@Vision267]

How to select the test VOLATGE AND test current

[@onesmushangula3116]

Thank you so much!

[@mortezakarimi7538]

The video was decent. I wonder how this device reduces voltage drop error on the primary winding

[@ProtecEquipmentResources]

I’m not completely sure of the context of this question, but I am suspecting that it may have been related to the difference in how measurements may at one time have been made as opposed to the way they are currently made from a concern for safety. If we were to apply a voltage to the secondary and measure the voltage across the primary of a transformer, the potential at the primary could be lethal and perhaps more difficult to meter. However, if we were to apply a voltage to the primary and compare it to the secondary, then the voltage is much lower and less difficult to meter on the output of the instrument, perhaps making it more accurate and safer than if we applied a voltage to the secondary.

[@greatibekwe1779]

Thanks for the insight. Can this be done with only an AC voltage and a voltmeter

[@ProtecEquipmentResources]

You might be able to do this with only an AC voltage source and (2) precision voltmeters. One for the voltage source on the primary and one for the secondary voltage. This might work great for a single-phase transformer. However, when you get into a 3-phase transformer testing, your meters and your source are going to have to become a bit more complex. You will now have to monitor both phase-to-phase and phase-to-neutral voltages and their phase relationships to one another. This is dealt with by having the test equipment (TTR) apply the appropriate vector math for the configuration of the transformer being tested. You will find that most of these pieces of test equipment will calculate accuracies or % error based on having entered in nameplate information. Probably the most significant response to this question is that commercially available test equipment will by necessity have certain safety and convenience features built into them. Automatic Discharge Single Equipment Grounding Point Demagnetizing Feature Easy Access to transformer configuration selections and connection Diagrams Pass/Fail indications based on imbedded industry standards and programed nameplate data. Finally, with a piece of test equipment designed for performing TTR tests, you can have an electronically generated report available for your customer within minutes.

[@zmjpower]

Thank you for sharing

[@ProtecEquipmentResources]

Thanks for watching!

[@QuantumHoghead]

Awesome