can you explain what does" BIL" means? in Electrical engineering?

Answer 1

BIL is Basic Impulse Level. Sometimes it is referred to as "Basic Insulation Level".

It represents the "strength" of equipment's insulation for a high-voltage impulse. The impulse wave form is often 8 by 20 milliseconds -- An 8 ms rise and 20 ms in duration.

Here is a quote from C57.12.00:

"Transformers shall be designed to provide coordinated low-frequency and impulse insulation levels on line terminals and low-frequency insulation levels on neutral terminals. The primary identity of a set of coordinated levels shall be its basic lightning impulse insulation level (BIL)."

Each voltage class of equipment has a ANSI standard BIL rating. For example: 15 kV is the most common distribution voltage class in the US. Equipment installed on a 3-phase, 4-wire circuit in the 15 kV class with have a BIL rating of 95 kV. (The 15 kV class includes voltages from 11.8 kV through 14.4 kV. The most common actual system voltages are 12.47, 13.2, and 13.8 kV.)

The appropriate rating depends on whether the equipment is effectively grounded and/or connected to a 3-wire or 4-wire system. Some of the more common BIL ratings used on distribution equipment in North America are 60, 95, 125, 150, and 200 kV.

Transmission and substation equipment has a minimum BIL rating of 110 kV. Here are some of the minimum BIL ratings for various transmission voltages:

System - BIL
138 kV = 450 kV
230 kV = 650 kV
345 kV = 900 kV
500 kV = 1130 kV
765 kV = 1800 kV

Answer 2

Bil Meaning

Answer 3

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Each of the first six responses to "what is a short circuit?" are correct. However they fail to address the fact that a short circuit is an unintentional current path that typically produces enough extra current to flow in the circuit that the overcurrent protective device for the circuit trips. If the impedance of the short circuit is low enough the protective device operates instantaneously. If the impedance of the short circuit is higher the fault path (or short circuit by another name) can appear to the protective device as an overload. If the impedance of the fault path is higher it may only cause the circuit function to not work properly and the power would continue to flow until the problem gets worse or the circuit is powered down and repaired. Protective devices such as fuses and breakers can be constructed so that when they fail or open they give an indication to the trained electrician or technician what type of fault caused it to operate.

Answer 4

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RE:
can you explain what does" BIL" means? in Electrical engineering?

Answer 5

For beginners , the Basic Impulse Insulation (Basic insulation level) Levels refers to the ability of electric equipment such as transformers to withstand lightning surges. When lightning strikes a transmission line, a traveling wave is created. This traveling wave travels along the line and damages the transformer winding.

Surge arresters mounted on the line can mitigate the surge, however, they cannot totally eliminate it. also Voltage surges can also be created by the switching of circuit breakers and switches which is very common

The BIL or the Basic Impulse Insulation level indicates the ability of the transformer to withstand these heavy surges as the are inevitable

Answer 6

BIL means basic insulation level.It is very much important for insulation coordination point of view.For detail visit http://www.etrical.blogspot.com

Answer 7

"Basic Impulse Level"
A rating applicable to H. V. Transformers.

Answer 8

F = BIl

F = Force (N)
B = Magnetic Field (T)
I = Current (A)
l = Length of the wire (m)