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消谐装置其本质是一种高容量非线性电阻器

网址:www.xiaohuxianqua.cn  2021-11-15  作者:admin    阅读:

消谐装置其本质是一种高容量非线性电阻器,起阻尼与限流的作用。可以起到良好的限制电压互感器铁磁谐振的效果。 如果6~35kV电网中性点不接地,母线上Y0接线的PT一次绕组,成为该电网对地唯一金属性通道。电网对地电容通过PT一次绕组有一个充放电的过渡过程。试验测得此时常常有最高幅值达数安培的工频半波涌流通过PT,此电流有可能将PT高压熔丝熔断。而安装了消谐器后,这种涌流将得到有效抑制,高压熔丝不再因为这种涌流而熔断。
The essence of harmonic elimination device is a kind of high capacity nonlinear resistor, which plays the role of damping and current limiting. It can limit the ferroresonance of voltage transformer. If the neutral point of 6-35kV power grid is not grounded, the primary winding of Pt connected on the bus Y0 becomes the only metallic channel to the ground. There is a transition process of charging and discharging for the grid to ground capacitance through Pt primary winding. The test shows that there is usually a half wave inrush current with the highest amplitude of several amperes passing through Pt, which may fuse the PT high-voltage fuse. After the harmonic eliminator is installed, the inrush current will be effectively suppressed, and the high-voltage fuse will not be fused due to the inrush current.

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