Contents
What is a stiff source?
“Stiff source” means low source impedance, high ratio of prospective short circuit current / rated current, low effect of source voltage by changing load current. In the context to IEEE 519, notching is essentially a microsecond range short circuit caused by reverse recovery current of a thyristor.
What is meant by stiffness of a power system?
As we use the term, stiffness reflects the electrical supply’s source impedance. The stiffer it is, the less impact changing loads will have on the voltage. This is true both at the power frequency (60 hertz) and at the harmonic frequencies.
What is stiff voltage divider?
A voltage divider in which the base current is small compared to the current in R2 is said to be a stiff voltage divider because the base voltage is relatively independent of different transistors and temperature effects.
What is a stiff grid?
A “stiff system” is a generating system that is of sufficient capacity or the generator is “small” in relation to the system grid, that the AC system voltage under impulse/step loading condition does not require forcing of the generator field to maintain the power grid voltage.
What is the meaning of stiffness *?
stiffness noun [U] (BEING UNABLE TO MOVE) the condition of being unable to bend or move easily: I had some muscle stiffness after the bike ride.
What does stiff load mean in a control system?
In Control systems, when it comes to governer control, I came across with a term Stiff Load. Can someone please explain what it means? A “stiff load” in a mechanical system is one which does not undergo substantial deformation or interaction with forces applied to it.
What does the stiffness of a material mean?
A material’s stiffness indicates its ability to return to its original shape or form after an applied load is removed. When a material is subjected to a load — its own unsupported weight, an external applied load, or both — it experiences stress and strain.
What does it mean when a current source is stiff?
The voltage changes little with different currents. It is less common, but you could also say a current source is “stiff”. In that case it means very high impedance. The current changes little with different voltages. In either case the value of interest doesn’t change much as a function of applied conditions.
Which is an example of a stiff system?
In an electrical system a stiff system would be one where eg the load on a power supply did not vary as voltage varied – not a usual situation. Stiff means the value of interest doesn’t change much as varying pressure is applied that should change it. For example, concrete is stiff because it deflects little with applied force.