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发明公开
CN105977935A 手动模拟电网保护装置零序方向过流保护动作范围的方法 有权

手动模拟电网保护装置零序方向过流保护动作范围的方法
摘要：
本发明公开了一种确定零序方向过流保护动作范围的方法，用于电网保护装置，该方法包括获取电网保护装置的方向灵敏角φ；将电网保护装置的理论动作范围设置为‑φ‑90°+360°·k＜φ＜‑φ+90°+360°·k，其中，当电网保护装置为主变压器保护装置且其零序方向指向变压器时，k＝1，否则，k＝0；在对电网保护装置进行响应调试时，分别使短路零序电流超前短路零序电压‑φ‑90°+360°·k‑θ1、‑φ‑90°+360°·k+θ2、‑φ+90°+360°·k‑θ3以及‑φ+90°+360°·k+θ4，当电网保护装置的四种响应均正确时，则电网保护装置的零序方向过流保护动作范围为‑φ‑90°+360°·k＜φ＜‑φ+90°+360°·k，其中，θ1、θ2、θ3以及θ4的范围区间是(0，90°)。本发明能够在手动模拟单相接地故障时，当灵敏角为零序方向灵敏角时，准确确定电网保护装置的零序方向过流保护的动作范围。
摘要（英）：

The invention discloses a method for determining a zero-sequence directional overcurrent protection action range. The method is used for a grid protection device, and comprises the steps of acquiring a directional sensitive angle phi of the grid protection device; and setting a theoretical action range of the grid protection device as phi is larger than -phi-90 DEG + 360 DEG.k and smaller than -phi+90 DEG + 360 DEG.k, wherein the grid protection device is a main transformer protection device and the zero-sequence direction thereof points a transformer, k=1, otherwise, k=0; during response debugging of the grid protection device, short-circuit zero-sequence current exceeds short-circuit zero-sequence voltage by -phi-90 DEG + 360 DEG.k - theta1, -phi-90 DEG + 360 DEG.k + theta2, -phi+90 DEG + 360 DEG.k + theta3 and -phi+90 DEG + 360 DEG.k + theta4; and when the four kinds of response of the grid protection device are accurate, the zero-sequence directional overcurrent protection action range of the grid protection device is: phi is larger than -phi-90 DEG + 360 DEG.k and smaller than -phi+90 DEG + 360 DEG.k, wherein the intervals of theta1, theta2, theta3 and theta4 are (0, 90 DEG). When a single-phase grounding fault is manually simulated and the sensitive angle is a zero-sequence directional sensitive angle, the method can accurately determine the zero-sequence directional overcurrent protection action range of the grid protection device.

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