DER EE DE-33 Manual de Instruções descarregar pdf (Página 3)

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II. Measuring Principle Introduction

Impedance parameter introduction

䎷䏋䏈䎃䏌䏐䏓䏈䏇䏄䏑䏆䏈䎃䏆䏒䏑䏖䏌䏖䏗䏖䎃䏒䏉䎃䏕䏈䏖䏌䏖䏗䏄䏑䏆䏈䎃䎋䏕䏈䏄䏏䎃䏓䏄䏕䏗䎌䎃䏄䏑䏇䎃䏕䏈䏄䏆䏗䏄䏑䏆䏈䎃

䎋䏌䏐䏄䏊䏌䏑䏄䏕䏜䎃䏓䏄䏕䏗䎌䎑䎃䎩䏒䏕䎃䏈䏛䏄䏐䏓䏏䏈䎏䎃䎽䏖䎃䏕䏈䏓䏕䏈䏖䏈䏑䏗䏖䎃䏗䏋䏈䎃䏌䏐䏓䏈䏇䏄䏑䏆䏈䎃䏌䏑䎃

䏖䏈䏕䏌䏈䏖䎃䏐䏒䏇䏈䎑䎃䎽䏖䎃䏆䏄䏑䎃䏅䏈䎃䏇䏈䏉䏌䏑䏈䏇䎃䏄䎃䏆䏒䏐䏅䏌䏑䏄䏗䏌䏒䏑䎃䏒䏉䎃䏕䏈䏖䏌䏖䏗䏄䏑䏆䏈䎃䎵䏖䎃䏄䏑䏇䎃

䏕䏈䏄䏆䏗䏄䏑䏆䏈䎃䎻䏖䎑䎃䎬䏗䎃䏄䏏䏖䏒䎃䏆䏒䏘䏏䏇䎃䏅䏈䎃䏇䏈䏉䏌䏑䏈䏇䎃䏄䏖䎃䏄䎃䏟䎽䏟䎃䎋䏟䎽䏟䎃䎠䎃

䎵䏖䎕䎃䎎䎃䎻䏖䎕䎃䎌䎃

䏒䏉䎃䏐䏄䏊䏑䏌䏗䏘䏇䏈䎃䏚䏌䏗䏋䎃䏄䎃䏓䏋䏄䏖䏈䎃䏄䏑䏊䏏䏈䎃䕠䎑䎃

Zs = Rs + jXs or |Zs|

Rs = |Zs| cosș

Xs = |Zs| sinș

Xs/Rs = tanș

ș = tan-1(Xs/Rs)

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If ș > 0, the reactance is inductive. In other words, if ș < 0, the

reactance is capacitive.

There are two types for reactance. The one is the inductive

reactance XL and the other is the capacitive reactance XC.

䎃

䎷䏋䏈䏜䎃䏆䏒䏘䏏䏇䎃䏅䏈䎃䏇䏈䏉䏌䏑䏈䏇䎃䏄䏖䎝䎃䎃

䎋

䏉䎃

䎠䎃䏖䏌䏊䏑䏄䏏䎃䏉䏕䏈䏔䏘䏈䏑䏆䏜䎌䎃䎃

XL = 2 ʌf L䎃䎃䎃䎃䎃䎋䎯䎃䎠䎃䎬䏑䏇䏘䏆䏗䏄䏑䏆䏈䎌䎃䎃

XC =1/ (2 ʌf C)䎃䎃䎋䎦䎃䎠䎃䎦䏄䏓䏄䏆䏌䏗䏄䏑䏆䏈䎌䎃䎃

Measurement mode

The impedance could be measured in series or parallel

mode. The impedance Z in parallel mode could be represented

as reciprocal of admittance Y. The admittance could be defined

as Y = G + jB. The G is the conductance and the B is the

susceptance.

䎃

Rs: Resistance in series mode

Xs: Reactance in series mode

Cs: Capacitance in series mode

Ls: Inductance in series mode

Rp: Resistance in parallel mode

Xp: Reactance in parallel mode

Cp: Capacitance in parallel mode

Lp: Inductance in parallel mode

Y = 1/Z = 1/Rp + 1/jXp = G+jB

1 2 3 4 5 6 7 8 ... 18 19

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