| 摘要 |
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 iA(tj), iB(tj) and iC(tj) and voltage signals uA(tj), uB(tj) and uC(tj), measured at moment of time tj, are memorized by means of ring-formed memory. Values of diagnostic coefficients for any phase gamma are measured simultaneously on base of data of signal and of signals iA(tj-1), iB(tj-1) and iC(tj-1) and uA(tj-1), uB(tj-1) and uC(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 gammaH A, gammaH B and gammaH C, received according to similar procedure for 100% serviceable load. When adjusting system, values of admissible difference of standard coefficients DeltagammaH 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 |
