Characteristics of power frequency spark machine:

According to the American UL standard requirements: wire and cable in the spark test, any one point must receive more than 18 times against voltage detection (Chinese CCC standard is 6 times the voltage), voltage power frequency spark machine hit detection only 50 times per second, 2500--3500 more times per second high frequency voltage detection spark machine, so the high frequency spark machine for the detection of high speed wire production line, and is suitable for frequency below 500 m / min speed and wire sheath production line detection. High frequency spark machine can not be used in the production of reason for low speed wire detection, because the speed of the production line in less than 500 m / min, high frequency voltage (2500 voltage --3500 voltage / sec) because of the speed of the production line of slow and repeated tests, finally will damage the wire and cable, AC spark testing machine to make the air ionization products around (a blue corona electric field). This corona is conductive and provides a good test even when the electrode bead chain is not connected. Corona is due to the positive turn of alternating current in each cycle. For these reasons, the corona produced by the high frequency spark machine is more than that of 60 hertz. It is also because the corona near the wire products is hot. If we put a grounded cable on the electrode with high frequency electrode voltage for a while, you will notice that the insulation part that has contact with corona has obvious heat. This heat helps to break thin wires, or wire rods are not detected through electrodes. As a result, the subsequent spark test and high voltage insulation test will fail.