This section provides an overview for dielectric strength testers as well as their applications and principles. Also, please take a look at the list of 7 dielectric strength tester manufacturers and their company rankings.
Table of Contents
Dielectric Strength Testers are testers that can apply the insulation voltage that electrical equipment can withstand.
Insulation voltage refers to the voltage that an electrical device can withstand when a voltage is applied to it without any problems. When this withstand voltage is increased and at a certain point it can no longer be withstood, that voltage is called the breakdown voltage.
Electrical equipment must have a dielectric breakdown voltage. If the dielectric strength is low, deterioration or external factors may cause dielectric breakdown during use.
If the breakdown voltage is low, deterioration or external factors may cause breakdown during use, resulting in failure of the electrical equipment or, in the worst case, a fire.
Dielectric Strength Testers are used to check the dielectric strength of all the electrical equipment.
Dielectric Strength Testers are mainly used to confirm that electrical equipment is electrically safe, for example, in factories that produce and ship electrical products or in factories that develop and manufacture prototypes of electrical equipment.
Electrical engineers who are developing or manufacturing prototypes of electrical equipment use the tester to confirm that there are no insulation withstand voltage problems with the electrical products in question.
The most common use of this tester is for testing the insulation withstand voltage of electrical products.
The most popular use of Dielectric Strength Testers is on factory lines where electrical products are manufactured.
Electrical products must be checked for dielectric strength before being shipped to the market. Dielectric Strength Testers are used to check the dielectric strength before shipment.
Dielectric Strength Testers are also used by engineers developing electrical products to check the dielectric strength of prototypes and design margins.
The principle of Dielectric Strength Testers is divided into an insulation voltage generation part and an overcurrent protection control part called impressed current.
For each of the voltage generation and current control sections, the set values are fixed to specified values when they are used in repetitive verification tests at factories and other facilities.
The fixed voltage and protective current values are applied to the electrical equipment to be tested, and a pass/fail judgment is made on whether the equipment passes or fails the insulation withstand voltage test.
The insulation withstand voltage for 100 V models is 1000 V for 1 minute, but when shipped from the manufacturer, 1500 V is applied for 1 second.
Each manufacturer has devised a method to allow testing to be performed in a short period of time, while still providing a margin of safety.
As described above, Dielectric Strength Testers are basically used to check the withstand voltage of mass-produced electrical equipment before shipment.
Therefore, it is required to measure the voltage that can be withstood quickly and reliably. Therefore, Dielectric Strength Testers themselves have a very simple structure.
The tester itself has a very simple structure, and it can simply measure the overcurrent at the time of a short circuit even if the part that generates the high voltage and the electrical equipment exceed the dielectric withstanding voltage and short-circuit.
The tester has an overcurrent detection protection function to protect both the electrical equipment and the tester by detecting the overcurrent at the time of short circuit.
There is a wide range of testing machines, from very inexpensive ones to expensive ones with built-in automatic programming functions, that can be used for insulation withstand voltage testing.
Dielectric Strength Testers are available in a wide variety of products, from very inexpensive ones to expensive ones with built-in automatic programming functions.
*Including some distributors, etc.
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