In the model, the leakage conductance
is constant, [G.sub.L]=0.3mS[cm.sup.-2], whereas the others dynamically change as follows [30, 34, 37, 38]:
[g.sub.l], [g.sub.Na], and [g.sub.K] are, respectively, leakage conductance, [Na.sup.+] channel conductance, and [K.sup.+] channel conductance.
Parameters in HH model are taken the typical value: maximum [Na.sup.+] conductance [g.sub.Na] = 120 mS/[cm.sup.2], maximum [K.sup.+] conductance [g.sub.K] = 36 mS/[cm.sup.2], leakage conductance [g.sub.l] = 0.3 mS/[cm.sup.2], and Nernst potentials are 50 mV, -80 mV, and -56 mV, respectively.
[D.sub.6] - diodes, [G.sub.1] - insulation leakage conductance of the positive pole
Scheme A of insulation resistance measurement in a 3-phase network: TS - separating transformer, DR - full-wave bridge rectifier, [R.sub.0] - current limiting resistor, [E.sub.a], [E.sub.b], [E.sub.c]--phase voltages of the source, [C.sub.a], [C.sub.b], [C.sub.c] - phase-to-ground capacitances, [G.sub.a], [G.sub.b], [G.sub.c] - phase insulation leakage conductances
Taking leakage conductance [g.sub.l] and sodium channel effective bias voltage [[bar.V].sub.m] as parameters, Terada et al.
They studied the bifurcations caused by leakage conductance [[bar.g].sub.l] and sodium ions antielectromotive force when ELF external electric field was considered.
The leakage conductance
is assumed to be constant, equaling [g.sub.l] = 0.3.