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for 11 kv non effectively neutral earthed system what is basic Insulation level required?
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∙ 14y ago
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Difference between insulation resistance and dielectric strength?
INSULATION RESISTANCE: The insulation resistance is a measure of the capability of a material to withstand leakage of current under a Vdc potential gradient. DIELECTRIC STRENGTH: The dielectric strength is a measure of the ability of the material to withstand a large field strength without electrical breakdown, and is usually expressed in volts per mil (.001') or volts per cm of dielectric.
Can you give me a sentence with insulation?
An insulation material is one which separates one region from another. Common uses would be electrical insulation, thermal insulation, and acoustic insulation.
What is the difference between Hot insulation and cold insulation?
Hot insulation can be found in materials that areheat conductors such as aluminum foil where as cold insulationcannot.
Is insulation a method of heat transfer?
Insulation is the exact opposite. Conduction is a method of energy transfer, insulation is the reduction or prevention of energy transfers
What is better insulation sand or wool?
wool is a better insulation than sand
What does BIL basic insulator level really mean and its differences with Impulse withstand voltage and power frequency withstand voltage?
BIL is basic insulation level as per you or in other words it would be "basic impulse level" which implies the limit up to which an insulator could withstand impulse due to lightning strikes. Impulse is generated on the insulation due to the high voltage surges and spikes due to lightning strikes. BIL is generally much higher as compared to power frequency withstand voltage. In other words BIL is lightning Impulse withstand voltage. Impulse withstand voltage is the voltage that is generated due to switching operation and it's much higher than power frequency withstand, but BIL or the lightning withstand voltage is a the voltage level that an insulation can withstand during surge or lightning strikes.
Basic impulse level BIL?
The Basic impulse level is the maximum peak voltage that a piece of equipment can withstand. When you exceed this rating the insulation will break down and short out.
What is insulation coordination?
Lightning impulse withstand voltage
What is the basic insulation level of various electrical equipments?
BIL or basic impulse insulation level is the dielectric insulation gradient of a material tested to withstand the voltage stress at a voltage impressed between the material and a conductive surface beyond the BIL rating, an electric tracking starts to occur which will then result into an arcing flashover to the conductive surface. In addition it is the capacity of an equipment to withstand mechanical stress..like lightning strike without causing any damage to the equipment...
What is the impulse withstand voltage?
Also known as basic insulation level (BIL): A specific insulation level, expressed in kilovolts, in accordance with which the complete system (including the line pole insulation to earth at every pole, the switchgear, the line isolators and reclosers, and the substations connected to the system, including their transformers) is designed and constructed. (NRS 039:1995)
Can the impulse withstand voltage be affected by altitude?
Yes. The IEC 60071.1 Std states a diminish withstand of aprox of 1% every 100mts above 1000mts. For example: for a 13.8kV system the insulation level should be of 95kV (interior). If the installation is going to be at 1,500mts then de minimum insulation level of your equipment must be: 95kv/(1-0.01*(500/100)) = 100kV BIL. The next std value for BIL is 125kV.
What is withstand voltage?
It is the rated test voltage that will not cause insulation breakdown.
What is class Y insulation?
Class Y insulation can withstand a max temperature of 90 degrees centigrade. Examples are Cotton, Silk, Paper, Wood, Cellulose, etc.
What is voltage grade of cable?
Voltage Grade of cables specifies the safe voltages which the insulation of the cable can withstand.
Difference between insulation resistance and dielectric strength?
INSULATION RESISTANCE: The insulation resistance is a measure of the capability of a material to withstand leakage of current under a Vdc potential gradient. DIELECTRIC STRENGTH: The dielectric strength is a measure of the ability of the material to withstand a large field strength without electrical breakdown, and is usually expressed in volts per mil (.001') or volts per cm of dielectric.
What is rated insulation voltage?
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.
What are the pros and cons of using wood fiber insulation?
Wood fiber insulation is cheap and relatively easy to install. However, it does not have the same insulation factor level as fiberglass insulation.
