CAJ | 학술논문

零序电流差动保护对接地故障灵敏度高，动作电流与变压器调压分接头无关，受励磁涌流影响小，原理简单等优点，在超高压自耦变压器保护上得到广泛应用。但零序电流差动保护由于反应自耦变压器三侧零序电流的相量和而动作，受电流互感器饱和影响较大，不易整定，在区外故障切除时常常导致保护的误动。据此提出“基于零序电流的超高压自耦变压器相位比较纵联保护方案”。该方案比较自耦变压器两侧保护处零序电流相位，根据相位相同或相反作为故障判据来区分自耦变压器内部故障或外部故障。动模试验数据和数字仿真验证结果表明，该方案具有对超高压自耦变压器接地故障灵敏度高，选择性好，能够正确反应自耦变压器各种轻微匝间故障，保护判据均不受零序电流非周期分量和故障侧电流互感器（CT）饱和深度的影响等优点。
령서전류차동보호대접지고장령민도고，동작전류여변압기조압분접두무관，수려자용류영향소，원리간단등우점，재초고압자우변압기보호상득도엄범응용。단령서전류차동보호유우반응자우변압기삼측령서전류적상량화이동작，수전류호감기포화영향교대，불역정정，재구외고장절제시상상도치보호적오동。거차제출“기우령서전류적초고압자우변압기상위비교종련보호방안”。해방안비교자우변압기량측보호처령서전류상위，근거상위상동혹상반작위고장판거래구분자우변압기내부고장혹외부고장。동모시험수거화수자방진험증결과표명，해방안구유대초고압자우변압기접지고장령민도고，선택성호，능구정학반응자우변압기각충경미잡간고장，보호판거균불수령서전류비주기분량화고장측전류호감기（CT）포화심도적영향등우점。
Zero-sequence-current-differential-protection-for-grounding-fault-has-the-advantages-of-high-sensitivity,-action-current’s-independence-with-transformer-tap-joint,-small-influence-from-inrush-current,-and-principle-simplicity.-It-is-widely-used-in-the-area-of-UHV-autotransformer-protection.-However,-the-zero-sequence-current-differential-protection-operates-due-to-responding-to-the-phase-sum-of-zero-sequence-current-in-three-sides-of-autotransformer,-which-is-badly-influenced-by-the-saturation-of-current-transformer-and-hard-to-set-the-threshold.-In-the-external-fault,-it-will-lead-to-mal-operation.-Based-on-this,-a-new-auto-transformer-pilot-protection-scheme-based-on-the-zero-sequence-current-phase-comparison-is-proposed.-The-fault-direction-can-be-determined-by-comparing-the-phase-shift-between-zero-sequence-current-of-high-voltage-side,-medium-voltage-side-and-the-reference-current.-So-the-internal-fault-and-external-fault-can-be-discriminated.-The-results-of-dynamic-simulation-experiment-and-digital-simulation-shows-that-the-proposed-method-can-detect-turn-to-ground-and-turn-to-turn-fault-with-high-sensitivity-and-good-selectivity.-Besides,-the-protection-criterion-is-not-affected-both-by-the-non-periodic-component-of-zero-sequence-current-and-saturation-level-of-fault-side-current-transformer-(CT).