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The instantaneous voltage rating of a given insulation sytem. In the case of a lightning strike, it is very high voltage but only for a split second. The insulation is designed to handle this rated voltage for a split second without damage to the apparatus. Any longer, and damage would result.
In low voltage wires, the insulation factor of the coating determines the wire's voltage rating. A wire coating of cross linked poly vinyl is used as an insulation. High voltage transmission wires uses no coating on the wire
By multiply current supply and voltage
The dielectric strenght of a transformer represents the maximum voltage permissible to apply across the transformer insulation i.e. between the transformer winding to another part of the transformer, normally the chassis or another winding and without break-down of the insulation ocurring (e.g. arcing). The breakdown voltage of a transformer represents a voltage that exceeds its dielectric strenght and that causes breakdown e.g. arcing across the insulation.
A megger is an instrument that generates a high voltage. That high voltage is then used for measuring insulation resistance, especially that of electrical devices.
To provide optimal insulation to high voltage equipments.
Rated insulation voltage is the maximum voltage that can be applied to the insulation of an electrical device without causing a breakdown or failure. It is a measure of the insulation's ability to withstand high voltage without impacting its performance or safety. The rated insulation voltage is typically specified by the manufacturer and is an important parameter to consider when designing or selecting electrical equipment.
It is the rated test voltage that will not cause insulation breakdown.
It is a easy voltage to obtain and can check for breakover in the insulation. The voltage is higher then what would be put through most wire and shows any weakness.
It depends what you mean by a 'high rating'!If you mean a high 'voltage rating' then, yes, you will require thicker insulation. But if you mean a high 'power rating', then, not necessarily, because the voltage can be low, while the current is high.Remember, the thickness of insulation depends on the voltage, while the type of insulation (how it withstands higher temperatures) depends on the current.
Lightning impulse withstand voltage
Voltage Grade of cables specifies the safe voltages which the insulation of the cable can withstand.
High voltage cables with this high an insulation factor are usually given a Hi Pot (High Potential) test and not meggered. The potential has to be higher that the working voltage of the cable to be effective when checking for insulation or connector breakdown.
On a hand crank megger which is used to test insulation breakdown, use the 300V setting. If the megger does not have that setting use 500V as opposed to 1000V for the test. The output of the megger is a DC voltage.
The instantaneous voltage rating of a given insulation sytem. In the case of a lightning strike, it is very high voltage but only for a split second. The insulation is designed to handle this rated voltage for a split second without damage to the apparatus. Any longer, and damage would result.
A capacitor's working voltage is the maximum voltage that the device can take without danger of breaking down the insulation between the plates. Above the working voltage, the insulation begins to deteriorate and the capacitor may short, explode, or simply stop working depending on the design of the part.
Upping the voltage is the easiest method to do but you have to be careful of the insulation rating of the wire in the electromagnet coil. As the voltage goes up so does the current and the heat produced by this action. By over exceeding the voltage rating of the wire this will cause the insulation to break down and short the coil out.