CAJ | 학술논문

针对电炉变压器频繁调压且调压范围宽的特点，提出根据当前电炉变压器有载调压档位实时计算差动保护的平衡系数方法。该方法首先将3个单相电炉变压器档位信息经有载调压档位控制器转换为BCD码信息；然后差动保护装置通过开关量方式接入转换后的BCD码信息，并解码还原为当前实际档位；最后根据变压器调压总档位、各相变压器当前档位、低压侧标称最高电压及最低电压，计算各相变压器低压侧当前工作电压，再结合变压器额定容量、高压侧额定电压，按相实时计算差动保护平衡系数。这种方法解决了电炉变压器差动保护的差动电流计算不正确的难题，工程实践表明该方法明显增加差动电流计算正确性提高差动保护灵敏度。
침대전로변압기빈번조압차조압범위관적특점，제출근거당전전로변압기유재조압당위실시계산차동보호적평형계수방법。해방법수선장3개단상전로변압기당위신식경유재조압당위공제기전환위BCD마신식；연후차동보호장치통과개관량방식접입전환후적BCD마신식，병해마환원위당전실제당위；최후근거변압기조압총당위、각상변압기당전당위、저압측표칭최고전압급최저전압，계산각상변압기저압측당전공작전압，재결합변압기액정용량、고압측액정전압，안상실시계산차동보호평형계수。저충방법해결료전로변압기차동보호적차동전류계산불정학적난제，공정실천표명해방법명현증가차동전류계산정학성제고차동보호령민도。
The-three-single-phase-on-load-transformer-tap-changing-furnace-transformer-has-the-advantages-of-wide-voltage-controlled-range-and-frequent-voltage-controlled-frequently,-.-This-paper-presents-the-differential-protection-device-of-the-furnance-transformer-should-calculate-the-balance-coefficient-of-the-differential-protection-in-real-time.-First,-The-the-gear-information-of-3-single-phase-electric-furnace-transformer-is-converted-to-BCD-code-information-through-the-OLTC-gear-controller;then-the-differential-protection-device-accesses-the-converted-BCD-code-through-switch-signal-and-decodes-the-information.;finally,-according-to-the-transformer-voltage-total-stallsgears,-each-phase-current-transformer-tap-,-low-voltage-side-of-the-highest-and-lowest-voltage-nominal-voltage,-each-phase-current-working-voltage-of-low-voltage-side-is-calculated,-combined-with-the-transformer-rated-capacity,-rated-voltage-of-the-high-voltage-side,-the-differential-current-calculation-is-adjusted-in-real-time-according-to-the-current-tap-of-the-furnace-transformer;.-this-This-method-solves-the-differential-current-electric-transformer-differential-protection-calculation-problem-is-not-correct.-The-engineering-practice-shows-that-the-methods-can-increase-the-accuracy-of-the-differential-current-calculation-and-significantly-improve-significantly-the-differential-current-protection-sensitivity.