Abstract
Improving the reliability of power supply is one of the most important tasks to be solved at the stage of design and operation of industrial enterprises. To ensure the required level of reliability, various technical means are used. The high-speed bus transfer device (HBT) is currently one of the most efficient and affordable. It is designed to improve the reliability of power supply to critical consumers and ensure the dynamic stability of a complex electric motor load during short-term power outings. The HBT operation is based on continuous monitoring of the values of phase voltages and currents on the buses of two switchgear inputs, converting them into complex effective values of voltages and currents of direct sequence, followed by software processing of the measurement results. Thanks to the use of high-speed vacuum circuit breakers and microprocessor relay protection devices, the switching time to the backup power source does not exceed 100 ms. Five main conditions under which the use of HBT is especially effective are given and analyzed. Particular attention is paid to the optimization of transient processes when switching to a backup power source by synchronizing the moment of switching on the vacuum circuit breaker. It has been established that the angle between the voltage vectors on the bus sections with a running-out motor load and the backup power source should not exceed 30 electrical degrees. The oscillograms of voltages on the operating and disconnected sections are given when the HBT is triggered after a power failure on one section of the substation bus sections. Based on the research results, some conclusions are made concerning the efficiency of transient stability assurance for a complex electric motor load during short-term power supply outings.
Keywords
high-speed bus transfer, power supply reliability, industrial consumers, continuous production
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