METHOD OF FUNCTIONAL INSPECTION OF STATIC AND DYNAMIC MEMBERS OF THREE-PHASE ELECTRO-MECHANICAL AND ELECTRO-TECHNICAL SYSTEMS Russian patent published in 2007 - IPC G01R31/00 

FIELD: electro-mechanics; data processing aids in electro-mechanics.

SUBSTANCE: method can be used for functional inspection of three-phase transformers, transmission lines and async engines equipped with short-circuited rotor. Three-phase current and voltage signals from outputs of current and voltage transformers are subject to analog-to-digital conversion. Digitized current signals i_A(tj), i_B(tj) and i_C(tj) and voltage signals u_A(tj), u_B(tj) and u_C(tj), measured at moment of time tj, are memorized by means of ring-formed memory. Values of diagnostic coefficients for any phase γ_Ф are measured simultaneously on base of data of signal and of signals i_A(tj-1), i_B(tj-1) and i_C(tj-1) and u_A(tj-1), u_B(tj-1) and u_C(tj-1), measured at moment of time tj during one period of input voltage/current. Received values if diagnostic coefficients are subject to comparison with values of standard coefficients γ^H _A, γ^H _B and γ^H _C, received according to similar procedure for 100% serviceable load. When adjusting system, values of admissible difference of standard coefficients Δγ^H are introduced into memory unit and those values are subject to comparison with measured values to judge on state of object under inspection.

EFFECT: simplicity; high speed of evaluation.

1 dwg, 3 tbl