A gas-liquid contactor includes a plurality of spray nozzles provided in a CO2 absorber, for spraying a CO2 absorbent downward into the CO2 absorber in which flue gas drifts upward and passes so as to bring flue gas drifting upward and the CO2 absorbent into contact with each other. To achieve this the plates are designed as cast parts and are fixed to the inner face of the casting wall from an exterior of the stator. With the present invention, 100 distributed power converters may be used per megawatt. The invention may use a novel approximation for calculating the total scaling values, which obtains a first term based on a corresponding distortion threshold, and obtains a second term based on a sum of the transform coefficients. The connector installation tool presets the proper positioning of the bracket, resulting in more reliable, fast, safe and accurate installation of the connector.