Why is silicon used more than germanium?
Silicon crystals have fewer free electrons than germanium crystals at room temperature, which is why silicon crystals are used for semiconductor devices. In general, the ICBO of germanium is 10-100 times greater than that of silicon, but the variation of ICBo at any temperature is lower for silicon than for germanium.
Why silicon is the best semiconductor?
Silicon, a very common element, is used as the raw material of semiconductors because of its stable structure. Purification of Silicon consumes large amounts of power.
What advantages does silicon have over other semiconductors?
Silicon prevailed because it has superior physical and technological properties compared to the other semiconductor materials. -Silicon is abundant in the earth crest as an ore in the form of quartizite, -There are effective extraction and purification methods of silicon from its raw material.
How is leakage current calculated?
The leakage current can be estimated as follows from the insulation resistance specification value and the rated voltage of the item using the formula I = V/R.
Is leakage current dangerous?
The leakage current is very dangerous if it exceeds the permissible safe limit. Only a small current needs to flow through the human body to cause harm and can be fatal for patients whose immune systems are already weak.
How can we reduce leakage current?
An especially simple and effective option for reducing leakage current is to use a 4-conductor filter with a neutral conductor instead of a 3-conductor filter.
How can VFD leakage current be reduced?
Install leakage breakers designed for the harmonics and surge suppression to the variable frequency drive’s own system and other system. (Switching speed does not have to be decreased.) Decrease the stray capacitances between grounds. (Use cables or wires that are insulated with materials of low relative permittivity.)
What causes a VFD to trip?
In a VFD application, the motor reacts to the varying voltage and frequency from the drive and develops torque for the load. Eventually the current demands become too large for the VFD to handle, so it trips out on an overcurrent fault. Overcurrent faults are the most common faults that will shut down a drive.
What causes VFD failure?
Overcurrent Fault Loose power connections cause overvoltage or overcurrent, blown fuses, and inevitably VFD damage. Loose wiring can cause erratic drive performance. This can result in unpredictable speed fluctuations and an inability to control your VFD.