METHOD OF NEUTRAL VOLTAGE AND ZERO POINT POSITION DETERMINATION Russian patent published in 2008 - IPC G01R29/16 

FIELD: physics.

SUBSTANCE: method involves measurement of instant phase voltage readings arrays in asymmetrical phase load mode and of symmetrical signal component of phase A obtained in differential amplifier by combining phase A u_AO1(t_j) signal and composite signal of three phases from resistor Y-point obtained at the same moments of time t_j=t₁, t₂, ..., t_N with increment where T is current (voltage) signal period and N is the number of readings per period; simultaneously asymmetrical U_AO1 and symmetrical U_A signal components of phase A are defined. Reactive quasipower of phase A voltages is defined, current signal readings are multiplied together, their active quasipower at phase A voltages is defined. Sine and cosine of vector divergence angle F between voltages U_A and U_AO1 are defined. U_N neutral voltage is determined. Sine of vector divergence angle D between voltages U_AO1 and U_N and sine of vector divergence angle E between voltages U_A and U_N are defined.

EFFECT: improved precision and simplicity of calculation.

3 dwg, 2 tbl