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The dielectric,usually the insulator between the plates of a capacitor, can be overstressed by the application of too high voltages applied to the capacitor plates. The dielectric breaks down and a current flows between the plates until,either they are discharged, or an equilibrium is reached,below the working voltage of the capacitor. If the dielectric is damaged in this process he capacitor must be replaced. Some dielectric material self heal and can recover from an over voltage.
What else can I help you with?
What is meant by cavity breakdown in liquid dielectric?
definetion of cavity breakdown
What happens to the charge of a capacitor when a dielectric slab is fit in it?
Changing the dielectric causes the capacitance to change.
What is a self healing capacitors?
Self-healing capacitors are types of capacitors designed to automatically repair themselves when a dielectric breakdown occurs. They typically contain a thin dielectric layer that can recover its insulating properties if a short circuit happens, preventing catastrophic failure. This feature enhances reliability and longevity, making them suitable for various applications in electronic circuits. Common types include polymer and metalized film capacitors, which are often used in power supplies and audio equipment.
What is dielectric stress?
The dielectric stress is the stress placed upon a material when a voltage is placed across it.
When will junction breakdown occurs?
Junction breakdown occurs in semiconductor devices when the reverse voltage applied across a p-n junction exceeds a certain threshold, leading to a rapid increase in current. This phenomenon typically happens in diodes and transistors when the reverse bias voltage surpasses the breakdown voltage of the junction, resulting in either avalanche breakdown or Zener breakdown, depending on the doping levels and the characteristics of the material. In general, junction breakdown is an undesirable effect in most applications but can be intentionally used in Zener diodes for voltage regulation.
Is there any change in the current or voltage coming from the other end of the dielectric after the dielectric breakdown occurs?
Yes. Once dielectric breakdown occurs the circuit is now completed through a conductive breakdown channel in the dielectric. The current injected in one end of the dielectric is matched by the current coming out of the other end.
What is dielectric breakdown?
The dielectric breakdown strength is 3,000 volts per millimeter.
What factors contribute to the occurrence of dielectric breakdown of air?
Dielectric breakdown of air occurs when the electric field strength exceeds the dielectric strength of air. Factors that contribute to this include high voltage levels, sharp edges or points, humidity levels, and the distance between conductors.
What is the dielectric breakdown strength?
The dielectric breakdown strength is the maximum electric field that a dielectric material can withstand before it breaks down and allows electrical current to flow through it. It is a measure of the insulation properties of the material.
What is meant by cavity breakdown in liquid dielectric?
definetion of cavity breakdown
How does humidity affect the dielectric breakdown strength of air?
Generally, dielectric breakdown strength decreases with increasing humidity. In air, exact relationships between dielectric strength and humidity are hard to derive, due to the numerous other variables compounding the relationships (e.g. electrode size and shape, air temperature and pressure). Sources: http://www.scienceforums.net/topic/37206-dielectric-strength-of-air/ http://en.wikipedia.org/wiki/Dielectric_strength
How does the moisture and temp effect the breakdown strength solid dielectric?
Generally, increased moisture levels will lower breakdown strength, especially if the dielectric readily absorbs water. Increasing temperature generally decreases breakdown strength of solid dielectrics. The dielectric strength of some materials may increase with temperature within limited temperature ranges. However, dielectric strength eventually begins to decrease at higher temperatures.
Which is another name for dielectric strength test?
ASTM D149 - 09 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
What is the most common and costly type of ESD damage?
Oxid failure is the most common type of ESD damage. When the voltage across a dielectric region excesses its dielectric tolerances, the result is a puncture of the dielectric. Once the dielectric has been punctured, small amount energy will be enough to create a short circuit. A device, after dielectric breakdown, will usually exhibit lower breakdown voltage, increased, leakage current and increased noise but not a catastrophic failure
What is Dielectric breakdown strength of air?
3KV/mm or 3X10^6 V/M
What is the dielectric breakdown field in air?
The dielectric breakdown field in air is typically around 3 kV/mm to 6 kV/mm. This is the minimum electric field that can cause air to become conductive and allow current to flow through it.
What has the author Stanley Whitehead written?
Stanley Whitehead has written: 'Dielectric phenomena' -- subject(s): Dielectrics 'Dielectric breakdown of solids' -- subject(s): Dielectrics
