| Teleindication responses status information of power equipment and relay protection equipment, and services for electric power dispatching automation system. With the promotion of unmanned substation work, teleindication is more critical for the dispatcher to correctly judge the situation of electric power system. Teleindication false is very common and has different reasons, which is very difficult to control effectively. At present, teleindication false has been researched, but lack of in-depth study of teleindication loop, especially the influence of different interferences on teleindication acquisition circuit.This thesis focuses on the in-depth study of teleindication false in the integrated automation system of substation. Comprehensive control measures were adopted to reduce the misinformation rate.First of all, introduced the electromagnetic environment in substation and the main electromagnetic interferences, analyzed the EMC approaches. Study on the transmission of teleindication and different causes of teleindication false, which lays the foundation of governance of teleindication false. Secondly, analyed the operational principle of teleindication information with PSPICE software, increased the shunt and filtering to improve anti-disturbance capability. And studied the anti-disturbance capability of the improved circuit to different interferences. Then studied on the use of ferrite ring to suppress high frequency interferences. Introduced the principle of anti-disturbance and established the model of ferrite ring. Magnetic saturation characteristics of ferrite ring are analyzed by ANSYS software. And the suppression effect of ferrite ring with different sizes and loads is studied, then proper ferrite ring is selected according to suppression requirement. Finally, measurements were did according to teleindication false in substation, the reasons of teleindication false were analyzed, and a series of measures were dopted to suppression teleindication false. |
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