Hipot is an abbreviation for higher potential. Traditionally, hipot tester is really a term offered to a course of electrical safety screening instruments used to confirm electrical insulation in finished appliances, cables or other wired assemblies, printed circuit boards, electrical motors, and transformers.
Under regular circumstances, any electrical device will produce a minimal sum of leakage present because of the voltages and internal capacitance current within the item. However due to design flaws or other elements, the insulation in a item can break down, ensuing in excessive leakage current movement. This failure situation may cause shock or demise to anyone that comes into contact with the faulty item.
A Hipot check (also known as Dielectric Withstanding Voltage (DWV) check) verifies that the insulation of a item or element is sufficient to protect the operator from electrical shock. Inside a typical Hipot check, higher voltage is applied in between a product's current-carrying conductors and its metallic shielding. The resulting current that flows through the insulation, recognized as leakage current, is monitored by the hipot tester. The concept powering the check is the fact that if a deliberate over-application of test voltage does not trigger the insulation to break down, the merchandise will probably be safe to use under normal operating conditions?ahence the title, Dielectric Withstanding Voltage test.
In addition to over-stressing the insulation, the test can also be performed to detect material and craftsmanship defects, most importantly small gap spacings between current-carrying conductors and earth ground. When a product is operated under regular circumstances, environmental elements such as humidity, grime, vibration, shock and contaminants can near these little gaps and make it possible for present to movement. This situation can create a shock hazard when the defects are not corrected in the factory. No other check can uncover this kind of defect as well as the Dielectric Withstand check.
Three kinds of Hipot tests are frequently used. These three tests one of electrical safety tester differ within the sum of voltage utilized and the quantity (or nature) of appropriate current flow:
Dielectric breakdown Test. The check voltage is increased till the dielectric fails, or breaks down, allowing an excessive amount of current to flow. The dielectric is often shattered by this test so this check is utilized on the random sample basis. This test allows designers to estimate the breakdown voltage of the product's style.
Dielectric Withstanding Voltage Test. A regular test voltage is utilized (below the set up Breakdown Voltage) and also the ensuing leakage present is monitored. The leakage current will have to be beneath a preset limit or the check is considered to have failed. This test is non-destructive and it is generally required by security companies to become performed as a 100% production line check on all products before they depart the factory.
Insulation Resistance Test. This check is used to provide a quantifiable resistance value for all of the product's insulation. The check voltage is applied within the exact same style as being a regular Hipot test, but is specified to become Direct Present (DC). The voltage and measured present worth are utilized to calculate the resistance in the insulation.
I studied ac power source for many years, manufactured ac electronic load. Now focused on leakage current tester research.
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