Various causes of over current thyristor
module, when the converter device damage of internal components, control or trigger system malfunction, reversible transmission circulation is too large, or inverter, ac voltage is too high, too low, or failure of lack of phase, overload load, will cause the power electronic device in the device's current exceeds normal working current.
As a result of the thyristor module flow capacity was much lower than the general electrical equipment, therefore, must to SCR module overcurrent protection measures.
SCR manufacturer for everybody below on thyristor module device may be used in four kinds of overcurrent protection measures: 1, the exchange of concatenated into line leak to sustain rectifier transformer using reactance limit short circuit current, but this method exists ac voltage drop when alternating current is larger.
2, electrical testing and overcurrent relay current detection is with the sampling current comparing with set point, when the sampling current more than the set value, the comparator output signal make phase-shifting Angle increases or pull the inverter to reduce the current.
Sometimes must stop.
3 for converter, dc speed switch device power and were more likely to short circuit, can adopt the action time of only 2 ms dc switch quickly, it can precede rapid fuse disconnect and protect the thyristor module, but expensive to use.
4, quick fuse compared with ordinary fuse, fast fuse is dedicated to the protection of power semiconductor power device over-current components, it has the characteristics of fast fuse, when she was six times the rated current flows through the fusing time is less than a cycle of power frequency (
Quick fuse can pick up on the ac side and dc side or with silicon controlled rectifier bridge arm series, which directly effect is better.
Generally speaking fast fuse rated current value (
Be less than the nominal party protected thyristor module tube current (
ITRMS which is 1.
Itav 57, at the same time should be greater than the actual state of flow through the silicon controlled party root current (
Above is explain for everybody to silicon controlled thyristor module module device may be used in four kinds of over current protection, more details in the website to view.
Warm prompt: zhejiang co. , LTD. , the production of silicon controlled rectifier thyristor module has 15 years experience of application of matching installation thrust plate radiator solves the chint group in actual heat dissipation problem inverter power devices, hotline: 0577 -
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