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.
What is the meaning of the basic insulation level BIL?
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.
Difference in BIL and CIFO ratings
However the use of creepage distance alone to establish orders of merit does not take into account other factors which depend on the creepage distance available per unit length of the insulator. This point is worth being borne in mind when choosing insulators, notably for applications where insulator length is a minor constraint.
Standard ANSI Standard C29.10 Designs
The designs listed are provided with standard ANSI-NEMA bolt patterns, but special bolt patterns and bolt hole sizes are available upon request. For additional information please consult the factory.
The design of our electrical standoffs and bus support insulators takes into account both the mechanical and electrical requirements of IEEE, IEC, NEMA and ANSI Standards. Testing is also performed in accordance with the applicable industry standards. Custom porcelain electrical insulators are also designed and manufactured for customer specific applications and requirements.
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When we are talking to design engineers we notice there is a lot confusion about temperature rise, ambient temperature and insulation system temperature rating, and how they interact. Hopefully we can simplify, amplify, elucidate and illuminate this topic for you today!