Creepage distance calculation pdf merge

The minimum clearance distance up to installation heights of 2000 m above sea level is determined from the rated surge voltage and the pollution severity. The use of these tables is explained in sections 2. Design engineers, especially printed circuit board pcb designers, are often not aware of the reasons for using creepage and clearance distances. The general guideline of 7,500 to 10,000 volts per inch is affected by the shapes of the conductors. Therefore, if the calculated creepage distance is smaller than the applicable. In the manual process, a magnifying glass or microscope is used, in the. Figure 762c illustrates the various types of tapers.

Pdf insulators play a crucial role in ensuring the normal operation of the power system. Calculating creepage and clearance early avoids design. Electrical safety and isolation in high voltage applications infineon. Then redundant regions are merged by nonmaximum suppression and. Pdf since release of edition 1 of iec 61730 series the photovoltaic industry has experienced rapid growth and undergone a large number of changes. Measurement of clearance and creepage distances according to vde iec. Applications that combine fully automatic and factory oriented. Calculate total conductor load combine load plus the loading constant from table 3. Creepage distances and clearances degrees of protection. Creepage distance is the shortest distance separating two conductors as measured along the surface touching both conductors. Determination of the rated surge voltage dependent on the mains according to table 3 in the brochure below. The european standard en 50107 requires minimum distances creepage distances and clearances between the active live parts of the highvoltage circuit and earthed metal parts. The minimum nominal creepage distance of an insulator situated between phase and earth is determined. Pdf derivation of creepage distance in terms of esdd and.

V mm 25 32 40 50 63 80 100 125 160 200 250 320 400 500 630 800 this voltage is for functional insulation, the working voltage, for basic and supplementary insulation of the circuit energized directly from the supply mains see 4. Measurements should be accurate and repeatable and should also consider the end application. Looking for the best path for electricity usually means measuring the distance from one conductor to another conductor. A detailed overview of the calculation of the clearance and creepage distance is available as a download. Dry arcing distance is the shortest distance outside the insulator along the air not along the insulator body and between those parts which normally have. Creepage distance is defined as the shortest path between two conductive materials measured along. Thus, according to the gaussian imaging formula, equation 1 is satisfied. You might have heard the term creepage or creep distance when referring to.

Taper length, l mergingtaper rate x offset distance. Clearance calculator this program is based on table 2h of iec 60950. Product safety engineering newsletter ieee web hosting. Consider comparative tracking index cti of your material after operating voltage, the most significant factor in the clearance and creepage requirements comes from the material properties of your pcb. Table 2l of the standard provides minimum creepage distances creepage distances in millimeters. Pdf an online measurement method for insulator creepage.

Select the insulation, pollution degree, nominal ac mains, and enter the working voltage peak or dc, then click on the button to get the corresponding clearance in mm and mils. Sharp points will require greater spacing, and large radii surfaces will require less spacing. Research on insulator creepage distance measurement based on different. What is meant by creep distance in insulator design. The red line shows the pcb creepage distance between two traces. The path of least resistance electricity, like water, likes to travel along the path of least resistance. An online measurement method for insulator creepage distance on. Any distance between the two falling outside the influence areas of the merge and diverge segments would be considered to be a basic freeway segment and would be analyzed accordingly. The size of these distances mainly depends on the open circuit voltage of the transformer.