Technique and Calculation Results of Currents and Voltages in the Circuits of the Measuring Element of the Protection Device of the Transmission Line Based on the Control of Transient Processes

The specifics of generation of the signals of current and voltage in the circuits of a directional element of wave relay protection during short circuit (SC) in overhead power transmission lines are considered. The computing method of transient processes in the protection circuits, including frequency filters, that attenuate the parameters of currents and voltages of the mode taking into account the higher harmonic components and probable deviations of the frequency of transmission line from the rated value is presented. It is revealed that it is advisable to implement the measuring circuits of the directional elements of wave relay protection with the three-section filter attenuating the frequencies from 45 to 55 Hz and the low pass filter with cutoff frequency that does not exceed 1 kHz.     

Experience in using recorders of synchronized current and voltage measurements on 110 kV overhead power lines

The results of an investigation of the functioning of recorders of synchronized measurements of electromagnetic transients on the Pugachi – Akbulak 110 kV overhead transmission lines (a branch of the JSC “IDGC of Volga” — “Orenburgénergo”) when checking the technical characteristics of oil-filled circuit breakers and when determining the location of a fault on the line by the wave method of bilateral measurements are presented.     

Traveling Wave-Based Fault Location System Connected to Busbar Voltage Transformers

Power Technology and Engineering - This article discusses the development stages of a traveling wave-based fault location (FL) system on electricity transmission lines that monitors voltage signals...     

Experience in using traveling-wave high-speed directional relay protection of ultrahigh-voltage overhead transmission lines

The results of the functioning of the traveling-wave relay protection of an ultrahigh-voltage overhead transmission line are presented. The operating effectiveness of this protection (taking into account the data of operational recorders) on the 500 kV Kinderi – Zainskaya GRéS overhead transmission lines since 1987, in particular, for external and internal short circuits, network switchings and lightning disturbances is described in detail. Recommendations are made on improving the protection algorithm.