電磁式電壓互感器是電力系統測量電壓的主要裝置。需進行二次變壓, 才能將電網上的信號變為電子測量裝置可用的信號。采用電阻分壓器來替代電磁式電壓互感器, 可將初級電壓直接轉化為10 V 以內的微信號, 具有體積小、傳輸頻帶寬、不存在飽和問題、無諧振點等優點。文中從路的角度分析了該分壓器的誤差特性, 從場的角度比較了幾種傳感器結構
方案, 分析了各方案的幅值誤差、相角誤差及最大場強, 從而得到了一種最佳方案, 并分析了該方案的幅值誤差的頻率特性。
關鍵詞: 電壓傳感器; 高電壓; 測量
Adopting the resistance divider to substitute the magnetic type PT , the primary voltage can be directly transformed to micro2signal within 10V. It possesses the advantages such as small volume , wide transmission belt of frequency , no saturation problem and without harmonic vibration point etc. The error character of the divider is analysed from the point of circuit , several sensor structure schemes are compared from the point of field ; the error of amplitude , the error of phase angle and the maximum field intensity of individual scheme are analysed , and a optimum scheme is thus obtained. And the frequency chracter of amplitudes of this scheme is analysed.
Keywords : Potential transformer ; High voltage ; Measurement