Analysis of the causes of general damage of ABB gto

The main reasons for the damage of ABB gto are lightning protection , ineffective over-voltage protection, poor operating conditions, poor operation management, poor installation or manufacturing quality, ABB gto specifications, ABB gto safety margin and other reasons. 

 

(1) Lightning protection and overvoltage protection measures are weak. At the end of the rectifier, lightning protection and overvoltage protection devices are installed. Even if lightning protection and overvoltage protection devices are installed, the operation is unreliable and the ABB gto is damaged due to lightning strike or overvoltage.

(2) The operating conditions are poor. Indirect transmission of the generator set, because the calculation of the ratio of the speed is not correct or the ratio of the diameter of the two belt pulleys does not meet the requirements of the ratio of the speed, so that the generator is operated at high speed for a long time, and ABB gto is also at a relatively high voltage for a long time. Work underneath, causing ABB gto to accelerate aging and be prematurely broken through damage.

(3) Poor operation management. The on-duty operator is not responsible for the work, and does not understand the change of the external load (especially between midnight and 6:00 am), or when the load-carrying fault occurs in the outside world, the operator does not perform the corresponding operation in time. Processing, generating an overvoltage and damaging the ABB gto.

(4) The quality of equipment installation or manufacturing is not sufficient. Because the generator set is running in a large vibration for a long time, ABB gto is also under the external force of this vibration; at the same time, because the generator set speed is high and low, the working voltage of ABB gto is also suddenly increased. Low ground changes, which greatly accelerated the aging and damage of ABB gto.

(5) ABB gto specifications do not match. When replacing the new ABB gto, the tube with the wrong working parameters is replaced or the wiring is incorrect, causing ABB gto breakdown damage.

(6) ABB gto safety margin is too small. ABB gto's over-voltage and over-current safety margins are small, making ABB gto unable to withstand the impact of over-voltage or over-current transients in the generator's excitation circuit. The above content is explained by Lewis, the statistical analyst of A&S Thyristor Co., Ltd. after-sales service department.

A&S Thyristor Co., Ltd. has a technically experienced R&D, production and after-sales service team. The company is dedicated to the research and development of high-end, high-speed, practical and convenient customers, and is dedicated to the development and production of high-end machines.