What is dielectric stress?
The dielectric stress is the stress placed upon a material when a voltage is placed across it.
It is the tensile force experienced by cable insulation Answer I think you mean either 'dielectric strength' or 'dielectric strain', rather than 'dielectric stress'. Dielectric strength is a measure of the maximum electric field a dielectric can withstand before breakdown, expressed in volts per metre. Dielectric strain is a measure of the electric flux density of an electric field, expressed in coulombs per square metre.
A method of stress control is controlling the distribution of dielectric stress. Uniform distribution of dielectric stress may be achieved in high voltage cables by surrounding the high stress areas of the high voltage cable with a tube of high permittivity material that makes contact at one end with a ground electrode contacting the shield of the high voltage cable.
An Electric field stress depends on the mechanical strength of the materials and the stresses that are generated during their operation. During high voltage applications, the dielectric strength of insulating materials are developed when subjected to high voltages.
Dielectric loss is basically loss caused due to heating of the dielectric but Dielectric breakdown means permanently destruction of the dielectric strength of the dielectric therby losing its property and hence behaving as a somewhat like conductor.
A dielectric constant is the permittivity of the air and is related as the dielectric medium
grading of a cables is the processs for creation of a uniformn dielectric stress within an insulator in a power line as dielecric stress has its max value at the surface of its core and minimum at its own surface hence a process is developed for the creation of a uniform stress as it prevents breaking of insulation as well as maintains uniform current flow
For an insulating material dielectric strength and dielectric loss should be respectively
the dielectric strength of a material is defined as the min electric stree due to which the meterial get ruptured is called dielectric strngth of that material.
For an insulating material dielectric strength and dielectric loss should be respectively high or low?
For an insulating material dielectric strength and dielectric loss should be respectively high or low
Capacitors are named after their dielectrics. So, an 'air capacitor' uses air as its dielectric, a 'mica capacitor' uses mica as its dielectric, and so on. There are lots of different dielectric used to separate the plates of a capacitor, each with different permittivities and dielectric strengths. As the perfect dielectric (i.e. one with both a very high permittivity and a very high dielectric strength) doesn't occur, the choice of dielectric is always a compromise… Read More
why need dielectric test for transformer
A dielectric material is an electrical insulator that's able to be polarized by an electric current. A dielectric cell is, as such, a cell containing this material.
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.
dielectric constant for vacuum is 1.
Thermal loss in dielectric heating
dielectric constant for sodium Hypochlorite
The answer will depend on the metal.
A dielectric is an insulating material that does not conduct electricity and is transparent to an electromagnetic field. Dielectric materials are used to separate conducting surfaces such as the plates inside a capacitor, wires inside transformers, electric cable conductors, and elsewhere in the electric industry where electrical separation of charged elements is necessary. The dielectric constant is a ratio of the capacitance of a capacitor in which a particular insulating material is the dielectric, to… Read More
capacitors are classified on the basis of dielectric material used inside it. For example the electrolytic capacitor consist electrolyte as dielectric mica capacitor consist mica as dielectric between plates and ceramic capacitor consist ceramic as dielectric.
high and high
No, these are two unrelated properties of a material.
The Dielectric Constant of a medium does not have a unit because it is a ratio.
Usually, dielectric materials have permanent dipoles. As temperature increases, the molecules in the dielectric have more thermal energy and therefore, the amplitude of random motion is greater. This means that the molecules are less closely aligned with each other (even in the presence of an electric field). Hence, the dielectric constant reduces.
E = Eo/k k is dielectric constant
boundary conditions for perfect dielectric materials
This depends on the particular dielectric. Each has a different breakdown strength.
The electric field is weakened when a dielectric is inserted.
Electrolytic capacitors use aluminium as a dielectric.
What will happen to the electrostatic force between the two charges placed in air when an dielectric sheet is placed between them?
The force will be decreased by a factor of K, the dielectric constant of that dielectric sheet.
high and low
Materials with a high dielectric constants are good insulators.
Changing the dielectric causes the capacitance to change.
The dielectric strength of vacuum is infinite because there is no molecule in the vacuum.
'Dielectric' is often used in a general sense to refer to a material (such as ceramic, mica, plastic or paper) which is a poor conductor of electricity. This term is used in the classical description of a capacitor -- two electric conductors separated by a dielectric. By applying electric charge to one conductor an electric field is created. The dielectric allows the electric field to pass through it and affect the other conductors; however the… Read More
A 'dielectric' describes a material that supports an electric field and is generally used to describe an insulating material. Two properties exhibited by a dielectric are its permittivity and its dielectric strength. High values of permittivity (abillity to improve capacitance) are desirable for dielectrics used in capacitors, and high values of dielectric strength (ability to withstand voltages) are desirable for insulators but, unfortunately, the two quantities aren't relatated. So, selecting a dielectric is a matter… Read More
The classification of capacitor types by material such as paper, ceramic, or tantalum refers to the insulating dielectric.
The contribution of the positive ions in the lattice to the dielectric constant (e.g. Cadmium Selenide).
The Dipole moment and Dielectric constant describe opposite electrical charges. Dipole charges are very positive while Dielectric charges are very negative.
ASTM D149 - 09 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
Strontium Titanate has a dielectric constant of 233. TDK in Japan makes Ultra-high Voltage Ceramic Capacitors using this as the dielectric material. Compared to distilled water at 76.7 - 78.2 (lowers as temperature rises). Types of glass can vary between 4 and 10.
it has a high dielectric capacity because it a molecular solvent and cos it contains ions.
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… Read More
dielectric constant is a property of a material, this question is asking the property of a two mixed together, in an undeclared ratio. But yes dielectric constants can be measured. The problem you will have is keeping a uniform mix.
It's a temperature dependent variable. Most data sheets from chemical suppliers state the dielectric constant at 25C (77F) as 20.7. As an aside, the term dielectric constant should only apply to values measured at zero frequency as dielectric permittivity changes according to theoscillationof the applied electric field
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 the difference between complex permittivity and static dielectric conatant?
If the temperature increases, the conductivity will increase too which means the dielectric constant is reduced
'Dielectric constant' is an archaic term for relative permittivity. They are one and the same.
If you take out the battery in a capacitor before inserting a dielectric will there still be charge on the dielectric?
The charge in a capacitor is between the plates. The dielectric is only an insulator that allows the plates to be very close without touching and discharging the charge. There is no battery in a capacitor.