(1) insufficient lightning protection and overvoltage protection measures.
Lightning protection and overvoltage protection devices are installed at the end of the rectifier, even if the rectifier tube is damaged due to lightning strike or overvoltage.
(2) poor operating conditions.
Indirect transmission generator set, because the ratio of speed calculation is not correct or the ratio of two belt disc diameter does not meet the requirements of the ratio of speed, so that the generator for a long time in high speed operation and premature breakdown damage.
(3) poor operation and management.
The operator on duty is not responsible for the change of the external load (especially between midnight at night and 6am on the next day), or when the external load rejection failure occurs, the operator fails to carry out the corresponding operation and treatment in time, resulting in over voltage and breakdown damage of the rectifier tube.
(4) equipment installation or manufacturing quality is not up to standard.
Because the generator set is running in the vibration for a long time, the rectifier tube is also under the external disturbance of the vibration.
At the same time, because of the high and low rotation speed of the generator set, the working voltage of the rectifier tube also fluctuates, which greatly accelerates the aging and damage of the rectifier tube.
(5) the specifications and models of rectifier tubes are inconsistent.
When replacing the rectifier tube with a new one, the tube whose working parameters do not meet the requirements is wrongly replaced or the wiring is wrong, resulting in breakdown damage of the rectifier tube.
(6) the safety margin of rectifier tube is too small.
The safety margin of over voltage and over current of rectifier tube is small
Rectifier current inspection method: firstly, remove all rectifier diodes in the rectifier, and measure the two lead lines of the rectifier diode with 100 R or 1000 R ohm of the multimeter (the head and tail are adjusted and measured once each).
If two measured resistance vary widely, such as the resistance value of up to several ten thousands Ω, small and resistance of only a few hundred Ω even smaller, show that the diode is good (except for occurrence of the soft breakdown is diode) and resistance is small, show that the diode has been broken down can't use.
Commonly used rectifier diode models
Pole type 4148 mounting mode patch power characteristic high power
Diode model SA5.0ACA-SA170ACA installation mode straight plug
Diode type IN4007IN4001 mounting mode direct insertion power characteristic low power frequency characteristic low frequency
Diode model 70HF80 mounting type screw type power characteristic high power frequency characteristic high frequency
Diode model MRA4003T3G mounting mode patch
Diode type 1SS355 mounting mode patch power characteristics high power
Diode type 6A10 mounting mode direct insertion power characteristic high power;
Model 2DHG installation mode direct insertion power characteristic high power
Diode model B5G090L mounting mode direct insertion power characteristic small power frequency characteristic ultra high frequency
Maximum reverse peak voltage (v) average rectifier current (a) maximum peak surge current (a) maximum reverse leakage current (Ua) positive voltage drop (v) appearance
IN4001 50 1.0 30 5.0 1.0 DO--41
IN4002 100 1.0 30 5.0 1.0 DO--41
IN4003 300 110 30 5.0 1.0 DO--41
IN4004 400 1.0 30 5.0 1.0 DO--41
IN4005 600 1.0 30 5.0 1.0 DO--41
IN4006 800 1.0 30 5.0 1.0 DO--41
IN4007 1000 1.0 30 5.0 1.0 DO--41
IN5391 50 1.5 50 5.0 1.5 DO--15
IN5392 100 1.5 50 5.0 1.5 DO--15
IN5393 200 1.5 50 5.0 1.5 DO--15
IN5394 300 1.5 50 5.0 1.5 DO--15
IN5395 400 1.5 50 5.0 1.5 DO--15
IN5396 500 1.5 50 5.0 1.5 DO--15
IN5397 600 1.5 50 5.0 1.5 DO--15
IN5398 800 1.5 50 5.0 1.5 DO--15
IN5399 1000 1.5 50 5.0 1.5 DO--15
RL151 50 1.5 60 5.0 1.5 DO--15
RL152 100 1.5 60 5.0 1.5 DO--15
RL153 200 1.5 60 5.0 1.5 DO--15
RL154 400 1.5 60 5.0 1.5 DO--15
RL155 600 1.5 60 5.0 1.5 DO--15
RL156 800 1.5 60 5.0 1.5 DO--15
RL157 1000 1.5 60 5.0 1.5 DO--15
Ordinary rectifier diode parameters (2)
Maximum reverse peak voltage (v) average rectifier current (a) maximum peak surge current (a) maximum reverse leakage current (Ua) positive voltage drop (v) appearance
RL201 50 2 70 5 1 DO--15
RL202 100 2 70 5 1 DO--15
RL203 200 2 70 5 1 DO--15
RL204 400 2 70 5 1 DO--15
RL205 600 2 70 5 1 DO--15
RL206 800 2 70 5 1 DO--15
RL207 1000 2 70 5 1 DO--15
2a01 50 2 70 5 1.1 DO--15
2a02 100 2 70 5 1.1 DO--15
2a03 200 2 70 5 1.1 DO--15
2a04 400 2 70 5 1.1 DO--15
2a05 600 2 70 5 1.1 DO--15
2a06 800 2 70 5 1.1 DO--15
2a07 1000 2 70 5 1.1 DO--15
RY251 200 3 150 5 3 DO--27
RY252 400 3 150 5 3 DO--27
RY253 600 3 150 5 3 DO--27
RY254 800 3 150 5 3 DO--27
RY255 1300 3 150 5 3 DO--27
General rectifier diode parameters (3)
IN5401 50 3 200 5 1 DO--27
IN5402 100 3 200 5 1 DO--27
IN5403 150 3 200 5 1 DO--27
IN5404 200 3 200 5 1 DO--27
IN5405 400 3 200 5 1 DO--27
IN5406 600 3 200 5 1 DO--27
IN5407 800 3 200 5 1 DO--27
IN5408 1000 3 200 5 1 DO--27
6a05 50 6 400 10 0.95 R--6
6a1 100 6 400 10 0.95 R--6
6a2 200 6 400 10 0.95 R--6
6a4 400 6 400 10 0.95 R--6
6a6 600 6 400 10 0.95 R--6
6a8 800 6 400 10 0.95 R--6
6a10 1000 6 400 10 0.95 R--6
P600a 50 6 400 10 0.95 R--6
P600B 100 6 400 10 0.95 R--6
P600D 200 6 400 10 0.95 R--6
P600G 400 6 400 10 0.95 R--6
P600J 600 6 400 10 0.95 R--6
P600K 800 6 400 10 0.95 R--6
P600M 1000 6 400 10 0.95 R--6
05Z13X硅穩壓二極管 Vz=12.4~13.1V,Pzm=500mW,
05Z15Y硅穩壓二極管 Vz=14.4~15.15V,Pzm=500mW,
05Z18Y硅穩壓二極管 Vz=17.55~18.45V,Pzm=500mW,
1N4003硅整流二極管 200V, 1A,
1N4004硅整流二極管 400V, 1A,
1N4005硅整流二極管 600V, 1A,
1N4006硅整流二極管 800V, 1A,
1N4007硅整流二極管 1000V, 1A,
1N5394硅整流二極管 300V,1.5A,
1N5395硅整流二極管 400V,1.5A,
1N5396硅整流二極管 500V,1.5A,
1N5397硅整流二極管 600V,1.5A,
1N5398硅整流二極管 800V,1.5A,
1N5399硅整流二極管 1000V,1.5A,
1N5403硅整流二極管 300V,3A,
1N5404硅整流二極管 400V,3A,
1N5405硅整流二極管 500V,3A,
1N5406硅整流二極管 600V,3A,
1N5407硅整流二極管 800V,3A,
1N5408硅整流二極管 1000V,3A