A method of forming a charge pattern includes treating a stamp layer with a plasma, applying the treated stamp layer to a surface of a substrate to thereby form a charge pattern on the surface of the substrate, and separating the stamp layer from the surface of the substrate. With this, a situation that the actuator is pressed as being twisted is eliminated to achieve an excellent action of pinching the signal transmission medium and an easy and reliable visual check of the state of rotation of the actuator. The universal joint is affixed to a shaft having a concentric bearing, which is further affixed to the camera mount, so that the camera mount can be rotated. At step, fault current generated during a fault in a power system is represented using an AutoRegressive model, with the fault current being assumed to be a combination of a Direct Current offset component, a fundamental wave component and harmonic components.