In this study, closed loop and grid independent prototype of 750 W cross-flow turbine whose cycle regulations are done by using adjustable wing mechanism is implemented. Movement to an adjustable wing is performed by direct current motor which is controlled by microcontroller by using screw shaft system and mechanical hand. The frequency of the obtained voltage are controlled in function of that the number of turns of the generator and of the turbine. For the control operation, the voltage frequency obtained from the generator has been measured with the zero crossing circuit and transferred to the microcontroller. With the setting of the number of turns on the turbine, the value of the frequency of the 500 W generator working in conjunction with the turbine is kept on desired levels. These operations are realized by using a PIC16F877 microcontroller. Then, frequency performance of the designed system is examined

Electric field grading devices have great importance for both the electric power transmission and distribution systems. This paper presents an improved electric field grading device used in the medium voltage metal-enclosed switchgear. The solutions have been carried out by using Ansys Maxwell 3D software. The structure of two electrodes designed as cylindrical and elliptical have been compared to determine the electric field grading device to be used in practice. The transient and steady-state analyses have been performed in both designs. The field grading device manufactured for the metal-enclosed switchgear has been tested according to IEC standards in a high voltage laboratory environment. This study revealed that the newly designed field-grading device can be used in the metal-enclosed switchgear more safely. It also encourages researchers to optimize the electric field distribution using different geometric structures and to create running conditions in smaller indoor environments.