One day, suddenly a motor stops working. Or a television stops working.
If an air conditioner’s motor or a liquid crystal television one day suddenly stops working, a corona discharge may have caused a dielectric breakdown.
It is known that devices that operate at high frequencies , high voltages are strongly affected by corona discharges.
Adphox’s CORONA-i XT series accurately detects even the faintest corona discharges.
In light of improving efficiency in energy consumption, the use of high frequencies and voltages are expected to grow in the future. This situation requires quality control methods to monitor corona discharges, which may cause breakdowns in the future.
 
Corona discharges are very faint breakdown signals
The number of electronic goods that operate at high frequencies and voltages has been steadily increasing in recent years.
This includes inverter controllers in air conditioners, motors in refrigerators and other devices, and liquid crystal televisions.
These electronic goods require pre-shipping quality control methods to eliminate corona discharges, a cause of future dielectric breakdowns.
If corona discharges are not measured and electronic goods generating corona discharges are shipped, breakdowns may occur in the market in the future.
In corona discharges, high frequencies and voltages encourage ionization of the air. This releases a faint current and generates ozone (O3).
Ozone (O3) greatly strengthens oxidation and progressively damages insulating films as corona discharges are being generated.
It is believed that collisions of ions released by corona discharges other than ozone also encourage dielectric breakdowns.
In any case, it is thought that corona discharges encourage dielectric breakdowns. This has created a desire for production of products free of corona discharges and quality control methods to insure that goods generating corona discharges are not shipped to the market.
 
Adphox CORONA-i XT series
Until now, there has not been an insulation test unit to accurately detect these corona discharges. People try to detect them by smell. (When there are corona discharges, an ozone smell is generated along with ozone.) They may look for the faint light generated by corona discharges in dark locations.
However, these corona discharge detection methods are not recommended as they are harmful to the body.
(It is a well known fact that the ozone (O3) generated by corona discharges is harmful to the body.)
We began research into detection circuits for faint corona discharges and radio-frequency pulses in order to solve these problems and in 2003 we released our XT-210 surge tester.
The CORONA- i XT-310 PB3a surge tester expanded the range for insulation testing from only coils and transformers to include general-purpose parts used under high frequencies and voltages.
This unit can be used for measurement in a variety of situations. These include not only high frequency and voltage transformers and coils but also the connectors and magnet wires themselves and the insulating strength in between the chassis and parts.
If you have work that needs to be measured for corona discharges, please contact us.
 
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