The cause of diode damage
time:2019-05-05

(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