|
|
| Line 1: |
Line 1: |
| In [[physics]], '''Peek's law''' defines the electric potential gap necessary for triggering a [[corona discharge]] between two wires:
| | Nice to meet you, my name is Numbers Held though I don't truly like being called like that. Hiring is her working day job now and she will not alter it anytime soon. What I adore doing is performing ceramics but I haven't made a dime with it. California is our birth location.<br><br>My weblog; [http://riddlesandpoetry.com/?q=node/19209 riddlesandpoetry.com] |
| | |
| <!--:<math>e_v = m_v g_v \delta r \ln \left ({S \over r} \right )</math>-->
| |
| ::<math>e_v = m_v g_v r \ln \left ({S \over r} \right )</math>
| |
| | |
| ''e''<sub>v</sub> is the "visual critical corona voltage" or "corona inception voltage" (CIV), the voltage <!--(in kilovolts) {unit is a nonsense if you do not provide an actual numerical quantity or the unit of the rest of the quatities} --> required to initiate a visible corona discharge between the wires.
| |
| | |
| ''m''<sub>v</sub> is an irregularity factor to account for the condition of the wires. For smooth, polished wires, ''m''<sub>v</sub> = 1. For roughened, dirty or weathered wires, 0.98 to 0.93, and for [[cable]]s, 0.87 to 0.83, namely the surface irregularities result in diminishing the corona threshold voltage.
| |
| | |
| ''r'' is the [[radius]] of the wires in cm.
| |
| | |
| ''S'' is the distance between the wires
| |
| | |
| δ is the air density factor <!--It is calculated by the equation:
| |
| ::<math>\delta = {3.92 b \over 273 + t}</math>
| |
| :where
| |
| :* ''b'' = pressure in centimeters of mercury
| |
| :* ''t'' = temperature in degrees Celsius
| |
| | |
| :At -->with respect to [[Standard conditions for temperature and pressure|SATP]] (25°C and 76 [[cmHg]]):
| |
| | |
| <!--::<math>\delta = {3.92\cdot76 \over 273 + 25} = 1</math>-->
| |
| ::<math>\delta = {\rho \over \rho_{SATP}}</math>
| |
| | |
| ''g''<sub>v</sub> is the "visual critical" [[electric field]], and is calculated by the equation:
| |
| | |
| <!--::<math>g_v = g_0 \delta \left ( 1 + {0.301 \over \sqrt{\delta r}} \right )</math>-->
| |
| ::<math>g_v = g_0 \delta \left ( 1 + {c \over \sqrt{\delta r}} \right )</math>
| |
| | |
| :where ''g''<sub>0</sub> is the "disruptive electric field", and c is an empirical dimensional constant. The values for those parameters are usually considered to be about 30-32 [[kilovolt|kV]]/[[centimeter|cm]] (in air <ref>{{cite web|last=Hong|first=Alice|title= Electric Field to Produce Spark in Air (Dielectric Breakdown)|work=The Physics Factbook|year=2000|url=http://hypertextbook.com/facts/2000/AliceHong.shtml}}</ref>) and 0.301 cm<sup>½</sup> respectively. This latter law can be considered to hold also in different setups, where the corresponding voltage is different due to geometric reasons.
| |
| | |
| == References ==
| |
| | |
| {{reflist}}
| |
| | |
| * {{cite book | author=F.W. Peek | title=Dielectric Phenomena in High Voltage Engineering | url=http://www.ee.vill.edu/ion/p183.html | publisher=McGraw-Hill | year=1929}}
| |
| * [http://print.google.com/print?id=jDn78ePM-nwC High Voltage Engineering Fundamentals], E.Kuffel and WS Zaengl, Pergamon Press, p366
| |
| | |
| [[Category:Plasma physics]]
| |
Nice to meet you, my name is Numbers Held though I don't truly like being called like that. Hiring is her working day job now and she will not alter it anytime soon. What I adore doing is performing ceramics but I haven't made a dime with it. California is our birth location.
My weblog; riddlesandpoetry.com