(VI)ZL1(VII)Idph(VIII)Ufph(IX)Ifph(X)Yd(XI) (XII)abs(YdR)＞0.75B0(XIII) 。 ">

利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN102668290A 用于架空输电线路的差动保护的高阻抗接地故障检测方法 无效 - 撤回 转让

用于架空输电线路的差动保护的高阻抗接地故障检测方法
摘要：
本发明涉及一种在包括多条线路(1，12)和多个保护继电器(2，4)的三相高压输电系统中用于架空输电线路的差动保护的阻抗接地故障检测方法，所述方法包括以下步骤：1)在故障前状况下：-测量差动电流(I)；-测量继电器位置处的相电压(II)；-测量继电器位置处的相电流(III)；-利用以下等式计算差动导纳(IV)：(公式(V))。其中，(VI)：受保护线路的正序阻抗。2)在工作状况下：-测量差动电流(VII)；-测量继电器位置处的相电压(VIII)；-测量继电器位置处的相电流(IX)；-利用以下等式计算差动导纳(X)：(公式(XI))；-如果证实了以下公式，则检测到高阻抗接地故障：(XII)，其中，(XIII)；B0＝总的线路导纳。(I)(II)(III)(IV)(V) (VI)ZL1(VII)Idph(VIII)Ufph(IX)Ifph(X)Yd(XI) (XII)abs(YdR)＞0.75B0(XIII) 。
摘要（英）：

The invention concerns a method of impedance groundfault detection for differential protection of an overhead transmission line in a three-phase high voltage electric power transmission system which comprises many lines (1,12) and many protection relays (2,4), which comprises the following steps : 1) in prefault condition : - measuring the differential current (I); - measuring the phase voltage (II) at the relay location; - measuring the phase current (III) the relay location; - calculating the differential admittance (IV), with the following equation : (formula (V)). With (VI): the positive sequence impedance of the line-protected. 2) In operating condition: - measuring the differential current (VII); - measuring the phase voltage (VIII) at the relay location; - measuring the phase current (IX) at the relay location; calculating the differential admittance (X), with the following equation: (formula (XI)); - detecting a high impedance groundfault detection, if the following formula is verified: (XII) with (XIII); B0 = the total line admittance. (I)(II)(III)(IV)(V)(VI)ZL1(VII)Idph(viii)Ufph(IX)Ifph(X)Yd(XI)(XII)abs(YdR)>0.75B0(XIII).

0/0