A method for calculating power parameters using fuzzy algorithm technology for information visualization of power-receiving/switching boards

摘要

The present invention relates to a method for calculating a power parameter of a fuzzy algorithm technique for visualizing information of a switchgear. The power parameter calculation method is mainly composed of a fire index calculation method and a power condition index calculation method.;The method of calculating the fire index indicating the degree of fire risk by measuring and analyzing the leakage current, contact failure, transformer maximum temperature, overvoltage and phase loss in the switchgear, the leakage current is measured from the image current transformer (ZCT), Measure the temperature of the temperature sensor installed in each phase to determine the contact failure, and in order to estimate the maximum temperature of the transformer, in the case of the inflow transformer, the temperature of the sensor installed at the top of the transformer oil is measured, and the mold and dry transformer In the case of measuring the temperature of the sensor installed in the winding, measuring the voltage generated from the transformer to determine whether the overvoltage, and measuring the three-phase current to determine whether the phase; Either the temperature measured to determine the leakage current or the contact failure or the temperature generated to estimate the transformer maximum temperature or the voltage generated by the transformer exceeds a predetermined threshold or any one phase of three-phase current. Determining a fire index as state 6 (danger) when no current flows; Calculating a fire index through applying a fuzzy membership function of Dombi if the fire index is not determined as state 6 as described above, and then calculating a fire index through the fuzzy membership function; And if the fire index calculated as above is 0 or less than 0.2, the state 1, 0.2 or more and less than 0.4, state 2, 0.4 or more and less than 0.6, state 3, 0.6 or more and less than 0.8, state 4 and 0.8 or more is determined as state 5 The risk level is increased to the state 5, and the method of calculating the power condition index includes the normality of the current according to the percentage obtained by dividing the largest value of the load currents measured in each phase by the transformer allowable current. Determining an overload; Comparing the current voltage and the distribution voltage of the transformer to determine an undervoltage and an overvoltage; Determining whether or not normal based on a reference power factor (90%) by measuring a load power factor; Determining whether it is normal based on a rated frequency (60 Hz) by measuring a frequency; In the case of single-phase three-wire type, the current unbalance ratio is calculated by multiplying the current difference between two voltage lines by the sum of the currents of both voltage lines and multiplying by two. In the case of three-phase four-wire type, the difference between the currents of both voltage lines is the sum of the currents of both voltage lines. Dividing by and multiplying by 3 to determine whether it is normal; Determining totality by calculating a total harmonic distortion (THD); Calculating an expected value by applying a fuzzy membership function of Dombi and calculating a power condition index through the fuzzy membership function; And if the power condition index calculated as described above is more than 0 and less than 0.2, the state 1, if more than 0.2 and less than 0.4, the state 2, and if more than 0.4 and less than 0.6, the state 3, if more than 0.6 and less than 0.8, the state 4, if more than 0.8 is determined as state 5 The degree of risk is characterized in that it comprises a step indicating that the higher toward the state 5.;Switchgear, information visualization, power parameters, fire index, power condition index, fuzzy algorithm.