基于极化电流提高变压器零序保护方向元件可靠性的方法
By introducing a discrimination method based on polarization current and dual-polarization voltage vector, the problem of directional element failure in transformer zero-sequence protection devices under specific conditions is solved, achieving higher reliability and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING SIFANG JIBAO ENG TECH
- Filing Date
- 2022-12-12
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, when the voltage transformer is disconnected, the protection device is improperly installed, or there is a remote fault, the directional element of the transformer zero-sequence protection device fails, causing the zero-sequence protection to fail to operate and reducing its sensitivity.
A dual-polarized voltage vector is constructed by using polarization current and dual-polarized voltage vector to determine the direction of zero-sequence faults, combining the zero-sequence voltage on the fault side, the zero-sequence current on the low-voltage side, and the equivalent primary zero-sequence power supply impedance, thereby improving the reliability of the directional element.
It effectively avoids the failure of directional components, improves the reliability of zero-sequence protection devices, and ensures accurate identification of fault direction in various scenarios.
Smart Images
Figure CN115864311B_ABST