Realizing stable and reliable monitoring of a distribution network voltage environment can obtain real-time power parameter information ensure the normal safe operation transmission lines, which is great research significance engineering value. Based on distributed capacitance relationship between sensor line, an equivalent circuit dividing model proposed, relevant factors affecting stability r...

Measurements of medium and high voltages in a power grid are normally performed with large bulky voltage transformers or capacitive dividers. Besides installation problems, these devices operate relatively narrow frequency band, which limits their usability modern systems that saturated electronic devices. A sensor can be installed directly on wire without galvanic connection to the ground may ...

This paper presents a low-profile and autonomous piezoelectric energy harvesting system consisting of an extraction rectifier maximum power point tracking (MPPT) circuit for powering portable electronics. Synchronized switch on capacitor-inductor (SSHCI) technique with its unique two-step voltage flipping process is utilized to downsize the ponderous external inductor extend application areas s...

Monitoring, protection, and control processes are becoming more complex as distributed energy resources (DERs) penetrate distribution networks (DNs). This is due to the inherent nature of power DNs bi-directional flow current from various sources loads. To improve system’s situational awareness, grid dynamics entire DER integration must be carefully monitored using synchronized high-resolution ...

High penetration level of renewable energy sources and introduction controllable loads will result in significant harmonic emissions sag swell events the future electricity networks. Development methods for high performance simultaneous estimation frequency amplitude is required stable operation networks since zero crossing detection method (which widely used nowadays industry) not accurate eno...

In the paper a camera-mirror based 3D measurement system is introduced aimed for reconstruction of human body parts. During the measurement the patient cannot maintain static state even for a short period which may negatively affect the accuracy of the reconstruction. Nevertheless by such applications the duration of measurement plays significant role, as well. In order to handle these issues s...

The concept of a phasor synchronized with the power system was introduced in the 1980s and standardized for the first time with the standard IEEE 1344. That measurement concept was further developed in the current synchrophasor standard, IEEE C37.118 that was completed in 2005. It is currently undergoing revision to fully define the measurement in all conditions including dynamic changes in the...

This paper introduces an interferometric technique for the phase measurement of microwave devices. A handheld vector network analyzer (VNA) is presented for HF and VHF applications. A wideband synthesizer with multiple synchronized outputs is developed for extending the frequency range to the microwave band. The phase differences between the output signals can be set digitally with sub-degree a...