输电线路行波测量的自调零积分电路、测量电路及方法

• Format: Patent
• Language: Chinese
• Published: 25.07.2025
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

本发明公开了一种输电线路行波测量的自调零积分电路，包括：高速运放积分电路、低通滤波电路和第二高精度运放电路，其中外部输入信号依次经过高速运放积分电路、低通滤波电路和第二高精度运放电路后得到放大信号V3,所述放大信号V3反馈至高速运放积分电路的同向输入端。本发明还公开了应用于输电线路故障行波测量的测量电路及方法。本发明自调零积分电路通过将直流偏置补偿到积分运放的输入级，自动消除运放失调电压、偏置电流和温飘导致的直流偏置，提高了行波信号的测量精度和动态范围。 The invention discloses a self-zeroing integral circuit for power transmission line traveling wave measurement. The self-zeroing integral circuit comprises a high-speed operational amplifier integralcircuit, a low-pass filter circuit and a second high-precision operational amplifier circuit; an external input signal sequentially passes through the high-speed operational amplifier integral circuit, the low-pass filter circuit and the second high-precision operational amplifier circuit to obtain an amplification signal V3; and the amplification signal V3 is fed back to the non-inverting input end of the high-speed operational amplifier integral circuit. The invention further discloses a measuring circuit and a method for power transmission line fault traveling wave measurement. Accordi