There is two types of transformers in the market- linear transformer and switch mode power transformer. The transformers make is different. Sometimes it is just referred as ac transformer. Linear transformer mostly used in radio, project kits, Vcd and etc while switch mode transformer can be found in Monitor, Tv, Fax and so on.
A transformer consists of two or more coils wound on the same core. For power transformers, the core material is ordinarily iron. For a radio-frequency transformer, the core material is ordinarily ferrite or air. The basic property of a transformer is to change Ac voltage. A transformer cannot change direct current voltage. A step down transformer has a lower Ac production voltage at its secondary winding than the Ac input voltage to its primary winding. Conversely, a step up transformer has a higher secondary than primary voltage. The transformer laminations or coating of shellac, enamel or varnish is to insulate adjacent turns from shorts in the middle of winding. I will not go too details about how transformer work and transformer calculation as you can read more details from most electrical and electronic transformers books.
Oil Filled Capacitors
How to test transformers: Transformer failures are relatively rare in most electronic equipment, compared with other components. If too much current goes through a coil or winding, the winding heats up and can either open up completely, or the insulation in the middle of turns of wire can break down, causing the coil to be partly or completely shorted.
Howard S1000-11C-211-K - 1000 Watt - High Pressure Sodium Ballast - ANSI S52 - 480 Volt - Power Factor 97 - Max. Temp. Rating 90 Deg. C - Includes Oil Filled Capacitor Ignitor and Bracket Kit Best
Rate This Product :
Howard S1000-11C-211-K - 1000 Watt - High Pressure Sodium Ballast - ANSI S52 - 480 Volt - Power Factor 97 - Max. Temp. Rating 90 Deg. C - Includes Oil Filled Capacitor Ignitor and Bracket Kit Feature
- Brand: Howard
- - Part No.: S1000-11C-211-K
- - UPC: 799385901124
- - Voltage: 480 Volt
- - ANSI Code: S52
Howard S1000-11C-211-K - 1000 Watt - High Pressure Sodium Ballast - ANSI S52 - 480 Volt - Power Factor 97 - Max. Temp. Rating 90 Deg. C - Includes Oil Filled Capacitor Ignitor and Bracket Kit Overview
Brand Howard - Voltage 480 - ANSI Code S52 - Ballast Type CWA - Operates LU1000 - Warranty 2 Years -
Customer Reviews
*** Product Information and Prices Stored: Jan 19, 2012 23:53:30
Just like a coil, you can check continuity of any primary or secondary transformer winding. The actual value of Dc resistance you read is rather meaningless, but at least you will know either a winding is open. Checking linear transformer is quite right forward. Apply the ac voltage to the primary winding and expect production voltage at the secondary side. No or low production voltage means the transformer winding has open or shorted winding. Look for any evidence of overheating, such as darkened or blackened areas or a burnt smell.
About how to test a power transformer-it is a itsybitsy bit complicated. You cannot apply ac voltage to the equipment and expect the desire production at the secondary side without join together to load otherwise over voltage will happen (because you have removed all the secondary load) and will blow the power section which consist of power fet, pwm ic and etc. Switch mode power provide are designed to run with load while linear transformer can be test without load.
The best way to test a switch mode power transformer is first take off it from the board. Check only the primary winding as secondary winding failures are exceedingly rare. How do we know which one is the primary winding? Trace from the big filter cap the positive pin to see where the circuit goes. It will go to one of the pin of the transformer. Then look for the power fet middle pin which is the Drain and it will lead to another pin of the transformer. This two pins is the primary winding of the transformer. Checking the resistance of the primary winding only can recapitulate either it is open but it cannot check if it has industrialized a shorted winding. Only by using a ringer test you will know if it shorted or not. A shorted turn in the primary winding can cause the power section to blow.
The cheapest ringer tester that i came over is Dick Smith Lopt Meter or flyback tester. Just join together the probes to the primary winding and the corollary are right away seen from the Led bar graph. 4-8 bar laid out a good winding, 1-2 bar laid out partial short and if the led goes off means there is a heavy short in the winding. Besides checking the transformer it can be use to check B+ Coil, horizontal yoke coil and flyback primary winding and ballast (choke).
The high-priced ringer tester is from sencore equipment. Sencore Lc102 and Lc103C Besides checking capacitor it also have the potential to check all kind of winding. either it is a low voltage transformer, high voltage transformer, current transformer, pulse transformer, electric transformer, practice transformer this equipment will be able to check and test it.
If you do not wish to invest on this tester you may use a light bulb to check it. take off one of the primary winding pin and join together a 60 watt light bulb. One end to the circuit while the other to the transformer pin. If the bulb light and didn't goes off intuit a shorted winding and if the light goes off, the winding is ok.
Transformer heal is not easy and it require a good skill to do it. Most of the transformer repairer beloved to rewind bigger winding such as fan, car alternator and starter. Switch mode power transformer is a itsybitsy bit difficult to rewind because of the small size and low price.
Testing a Transformer - How To Accurately Test A Transformer150000 uF Capacitor Bank for Electric Car Tube. Duration : 1.25 Mins.Here is a 150000 uF Capacitor Bank that I am building for my EV. This should help take out the high amp spikes from the batteries and increase the performance a little bit and should make the batteries last a little longer. Will have a follow up video of the install and testing.
Keywords: Capacitor, Bank, Electric, Car, EV, Performance, Batteries, Caps, uf, Farad
No comments:
Post a Comment