|
|
| (One intermediate revision by one other user not shown) |
| Line 1: |
Line 1: |
| In [[physics]], '''Peek's law''' defines the electric potential gap necessary for triggering a [[corona discharge]] between two wires:
| | Andrew Berryhill is what his wife loves to contact him and he totally digs that title. I am really fond of handwriting but I can't make it my occupation really. Her family members lives in Ohio. Since he was 18 he's been working as an info officer but he ideas on changing it.<br><br>Feel free to surf to my blog; [http://www.aseandate.com/index.php?m=member_profile&p=profile&id=13352970 spirit messages] |
| | |
| <!--:<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]]
| |
Andrew Berryhill is what his wife loves to contact him and he totally digs that title. I am really fond of handwriting but I can't make it my occupation really. Her family members lives in Ohio. Since he was 18 he's been working as an info officer but he ideas on changing it.
Feel free to surf to my blog; spirit messages