公开(公告)号：US20120330582A1

公开(公告)日：2012-12-27

申请号：US13499635

申请日：2009-09-30

申请人： Andrzej Wiszniewski ,  Miroslaw Lukowicz ,  Marek Michalik ,  Andrzej Klimek

发明人： Andrzej Wiszniewski ,  Miroslaw Lukowicz ,  Marek Michalik ,  Andrzej Klimek

IPC分类号： G01R31/14 ,  G06F19/00

CPC分类号： H02H3/307 ,  H02H3/402

摘要： 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 _ dph pre ( I ) U _ fph pre ( II ) I _ fph pre ( III ) Y _ d pre ( IV ) Y _ d pre = I _ dph pre U _ fph pre - 0.5  Z L   1  I _ fph pre ( V ) Z L   1 ( VI ) I _ dph ( VII ) U _ jph ( VIII ) I _ jph ( IX ) Y _ d ( X ) Y _ d - I _ dph U _ jph - 0.5  Z L   1  I _ jph ( XI ) abs  ( Y _ dN ) > 0.75  B d ( XII ) Y _ dR = Y _ d - Y _ d pre ( XIII )

摘要翻译： 本发明涉及一种用于三相高压电力传输系统中架空输电线路的差动保护的阻抗接地故障检测方法，该系统包括许多线路（1,12）和许多保护继电器（2,4），其包括 以下步骤：1）在预失效条件下： - 测量差动电流（I）; - 测量继电器位置的相电压（II）; - 测量相电流（III）继电器位置; 用下式计算微分导纳（IV）：（式（V））。 带（VI）：线路保护的正序阻抗。 2）运行条件： - 测量差动电流（VII）; - 测量继电器位置处的相电压（VIII）; - 在继电器位置测量相电流（IX）; 用下式计算差分导纳（X）：（式（XI））; - 检测高阻抗接地故障检测，如果验证以下公式：（XII）与（XIII）; B0 =总线路导纳。 I _ dph pre（I）U _ fph pre（II）I _ fph pre（III）Y _ d pre（IV）Y _ d pre = I _ dph pre U _ fph pre-0.5Z ZL _ fph pre（V）ZL 1（VI）I _ dph（VII）U _ jph（VIII）I _ jph（IX）Y _ d（X）Y _ d - I _ dph U _ jph - 0.5 （XII）Y = d（XII）Y _ dR = Y _ d - Y _ d（XIII）