Dogic

In physics, Peek's law defines the electric potential gap necessary for triggering a corona discharge between two wires:

$e_v=m_v{g}_{v}r\ln \left(\frac{S}{r}\right)$

e_v is the "visual critical corona voltage" or "corona inception voltage" (CIV), the voltage required to initiate a visible corona discharge between the wires.

m_v is an irregularity factor to account for the condition of the wires. For smooth, polished wires, m_v = 1. For roughened, dirty or weathered wires, 0.98 to 0.93, and for cables, 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 with respect to SATP (25°C and 76 cmHg):

$\delta =\frac{\rho }{{\rho }_{SATP}}$

g_v is the "visual critical" electric field, and is calculated by the equation:

$g_v=g_0\delta (1+\frac{c}{\sqrt{\delta r}})$

where g₀ 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 kV/cm (in air ) and 0.301 cm^½ respectively. This latter law can be considered to hold also in different setups, where the corresponding voltage is different due to geometric reasons.

References

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• High Voltage Engineering Fundamentals, E.Kuffel and WS Zaengl, Pergamon Press, p366