CAJ | 학술논문

配电网采用架空线接线或电缆接线,使非有效接地方式的具体应用有时变的十分不合理,不仅没有提高供电可靠性,反而扩大了事故.分析了配电网中性点不接地、中性点经消弧线圈接地及中性点经高阻接地的接线方式、参数、正常运行及单相接地运行的电容电流、短路电流及各种过电压.提出接地电容电流小于允许值时适用于中性点不接地的架空线路系统,接地电容电流从允许值到100 A是适用于中性点接消弧线圈系统,接地电容电流大于100 A时应采用中性点接高阻系统.该方案可充分发挥非有效接地系统的优越性,提高电网运行的可靠性.
배전망채용가공선접선혹전람접선,사비유효접지방식적구체응용유시변적십분불합리,불부몰유제고공전가고성,반이확대료사고.분석료배전망중성점불접지、중성점경소호선권접지급중성점경고조접지적접선방식、삼수、정상운행급단상접지운행적전용전류、단로전류급각충과전압.제출접지전용전류소우윤허치시괄용우중성점불접지적가공선로계통,접지전용전류종윤허치도100 A시괄용우중성점접소호선권계통,접지전용전류대우100 A시응채용중성점접고조계통.해방안가충분발휘비유효접지계통적우월성,제고전망운행적가고성.
The power distribution network is connected by overhead line or cables, which makes it unreasonable sometimes to choose the ineffectively earthed mode in practical use. It doesn’t improve the reliability of power supply, or even expands the fault area. The article analyzes connected modes and parameters of the neutral ungrounded, neutral grounded via arc-suppression coil and neutral grounded via high impedance power distribution network, as well as the capacitive current, short circuited current and over voltages in the normal system and single-phase fault system. It is proposed that the neutral ungrounded mode is adopted in the overhead line system when the grounded capacitive current is meeting the allowed value, while the arc-suppression grounded system is adopted when the current stands between the allowed value and 100 A. When the current is over 100 A, the high impedance grounded system is adopted. The proposed method can make good use of the advantages of ineffectively earthed system and improve the operation reliability of the network.