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The paper presents the electromagnetic current-to-voltage transducers with coils designed and manufactured in a multi-layer printed circuit board technology. The analysis of the influence of the external magnetic field caused by other devices on operation of the current-to-voltage transducer has been presented. The analysis of the electromagnetic field distributions has been carried out using the...
E-diagnosis in the context of power industry means conducting remote, on-line diagnosing of electrical equipment with the use of several technologies like distributed data processing, distributed databases and modern communication protocols. In the paper the concept of e-diagnosis of switchgear equipment that separates spatially raw data acquisition, data processing and data storage has been described...
Smart grids are those electrical transmission and distribution systems that are networked and equipped with computer intelligence. That enables them to employ advanced test strategies requiring special conditions of the grid. In the paper methods and equipment for on-line testing of analog and digital measurement channels of protection relays have been presented. During the test all protection functions...
In the paper new sensing techniques have been presented that are applied in Circuit Breaker diagnosis. The techniques employ remote temperature measurement and emission spectrum detection. They are used for CB contacts evaluation. A thermal reference of the contacts working in closing and opening mode has been developed through simulation of CB contacts thermal model and verification with real measurement...
Temperature variations cause signal delay changes in GPS receiver and antenna and can be of the order of 0.1 ns/°C. Temperature stabilization of GPS antenna and receiver can increase the accuracy of time transfer by 2 to 3 ns. A temperature stabilization system for Motorola Timing 2000 GPS antenna has been developed. The temperature regulator and insulating layer fit inside the antenna cover. The...
Fivefold decrease of RMS jitter of 1 pps pulse from GPS receiver after SA switch-off and relatively short period required to filter it out has enabled the construction of GPS synchronized frequency sources of parameters almost order of magnitude better than with SA. At present state of the art, quartz resonator technology limit parameters of GPS synchronized quartz frequency source are 10-11 medium...
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