How to measure the insulation resistance of low-voltage circuit porcelain insulator

by:Mings     2020-05-21
How to measure the insulation resistance of low-voltage circuit porcelain insulator? Principle of the insulation resistance of the low voltage line porcelain insulator requirements are measured before installation, measurement method generally used 2500 v and above megohmmeter measurement, measuring steps are: ( 1) Put dry clean insulator, to test items. ( 2) Place the megohmmeter smoothly, shaking generator handle, two pens and contact, make a pointer to the 'O'. ( 3) Two pens and pick up on low voltage circuit to be tested, respectively, on the other side of porcelain insulator metal, evenly shake at a speed of 120 RPM, read the instructions. ( 4) Of insulator in operation, and more than 300 m Ω for qualified, new with insulator more than 500 m Ω to use. Low voltage line porcelain insulator string flashover discharge of the main reasons for what? Low voltage line porcelain insulator string flashover discharge of the main reasons are: ( 1) Can make low voltage line overvoltage caused by lightning, lightning magnetic insulator flashover, even an explosion. ( 2) Internal overvoltage: operating overvoltage, its value for the system three - phase voltage 4 times the left and right sides, under normal working voltage flashover: the main reason is low voltage line porcelain insulator caused by dirt and encounter the weather such as fog, drizzle, often referred to as pollution flashover. ( 3) Long-term power frequency voltage rise: in the neutral point grounding system, when one phase grounding metallicity, the other two phase voltage rise times, before the failure did not rule out the voltage rise, if there is insulation weaknesses in the insulator string, is likely to cause flashover.
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