Main deterioration factors of HV Switchgea

  Main deterioration factors of high voltage switchgear   As follows (1) Thermal degradation
Aging of insulating materials, aging of rubber and increase of contact resistance due to the increase of heating temperature (2) Electrical deterioration
The electric field concentration of insulating materials will lead to the decline of insulation performance (3) Mechanical deterioration
Damage, deformation, cracking and wear of parts caused by mechanical stress (4) Environmental degradation
Contamination, corrosion, moisture absorption and lubricating oil deterioration and solidification caused by environmental factors Generally, single factor deterioration is less, and most of them are comprehensive factor deterioration
The failure modes caused by heating and other factors are roughly as follows:   (1) Temperature rise - resistance drop of insulating material at the edge of the moon - dendritic discharge - flashover and short circuit (2) The effects of dirt, dust, mechanical stress, corrosive gas, etc
lead to the decrease of internal and surface insulation capacity of insulating parts - the increase of temperature - the intensification of the effect - the internal breakdown of parts (3) Increased contact resistance of contact due to poor environment, assembly and operation - increased temperature - greater contact resistance - short arc - flashover and short circuit   (4) The same as (3), which leads to control equipment or switch contact fusion welding - control failure and switch failure (5) Temperature rise, mechanical and environmental factors - decrease of mechanical strength of parts - equipment damage (6) Temperature rise - control wire insulation damage - breakdown, control failure (7) Internal equipment temperature rises - equipment damage - stop working Due to heating, the recommended service years of various equipment in high-voltage switchgear in Japan under normal ambient temperature are as follows:   (1) High voltage circuit breaker: within 20 years or specified service times   (2) High voltage load switch: indoor use, 15 years or 200 times of load current switching; Outdoor type, 10 years or 200 times of load current switching (3) High voltage disconnector: manual type, 20 years or 1000 times of closing and opening; Electric type, 20 years or 1000 times of closing and opening (4) Arrester: 15 years (5) Transformer: 15 years (6) Protection relay: 15 years   (7) High voltage current limiting fuse: indoor 15 years; Outdoor 10 years (8) Electromagnetic contactor: 15 years or specified switching times (9) Capacitor: 15 years   (10) Series reactor and discharge coil: 15 years (11) High voltage transformer: 20 years   When the ambient temperature exceeds the standard value, it can be estimated according to the rule of halving the service life of insulating materials for every 10 ° C increase   Manufacturer of distribution cabinet: http://www
jtcele
com/  ; High and low voltage distribution cabinet: http://www
jtcele
com/  ;