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Rectifier Diode Damage Causes
Feb 01, 2018

(1) lightning protection, over-voltage protection measures ineffective. At the end of rectification devices, lightning protection and over-voltage protection devices are installed. Even though lightning protection and over-voltage protection devices are installed, their work is not reliable, and the rectification tubes are damaged due to lightning or over-voltage.

(2) poor operating conditions. Indirectly-driven generator, because the speed ratio is not calculated correctly or the ratio of the two pulley diameter does not meet the requirements of the speed ratio, the generator is running at high speed for a long time, and the rectifier will also be at a long-term high voltage Work, to promote the rectifier accelerated aging, and was premature breakdown damage.

(3) Poor operation management. The shift operator is irresponsible and does not understand the change of external load (especially from midnight to 6:00 am the next day), or when the external load shedding load fails, the operation personnel do not perform the corresponding operation in time Treatment, resulting in over-voltage rectifier damage will be punctured.

(4) equipment installation or manufacturing quality, but off. Because of the long-term generator set in the larger vibration operation, so that the rectifier is also under the vibration of the external interference; the same time as the generator speed high and low, so that the rectifier withstand the operating voltage will be followed by sudden ups and downs Low-lying changes, this will greatly speed up the aging rectifier, damage.

(5) rectifier specifications and models do not match. Replacement of the new rectifier when the wrong parameters will not meet the requirements of the tube put on or wiring error, resulting in damage to the rectifier breakdown.

(6) rectifier safety margin is small. Rectifier over-voltage, over-current safety margin is too small, so that the rectifier can not withstand the generator excitation circuit over-voltage or over-current transient process peak damage. .