Bil electrical term

Bil electrical term

In the design of lines and equipment considering the minimum level of insulation required, it is necessary to define surge voltage in terms of its peak value and return to lower values in terms of time or duration. Although the peak voltage may be considerably higher than normal voltage, the stress in the insulation may exist for only a very short period of time.

Basic Insulation Level Definition

Whenever a over voltage surge appears in the system, it is discharged through surge protecting devices before the equipments of the system gets damaged. Hence, the insulation of such equipment must be designed to withstand a certain minimum voltage before the over voltage surge gets discharged through surge protecting protection devices. Hence, operating voltage level of surge protecting devices must be lower than the said minimum voltage withstanding level of the equipment. This minimum voltage rating is defined as BIL or basic insulation level of electrical equipment.

BIL is an abbreviation for Basic Impulse Level. Impulse tests are dielectric tests that consist of the application of a high frequency steep wave front voltage between windings, and between windings and ground. The BIL of a transformer is a method of expressing the voltage surge that a transformer will tolerate without breakdown.

Bil electrical term

basic impulse level (BIL)

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Bil electrical term

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Bil electrical term

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The regulator also published Monday its first response to the second draft by the TSOs of the national grid development plan (NEP 2030) which also includes details for German offshore grid connections through to 2030 (O-NEP 2030), which alone are estimated to cost up to Eur16 billion.