Abstract
Circuit breakers (CBs) in the transmission network are the basic elements for energy flow control. CB diagnosis represents a decisive action for increasing power system reliability and safety. Their actual availability status and ability to perform major functions can sometimes be difficult to determine. This paper presents a general state estimation model based on fuzzy logic (FL), membership function (MF), and expert knowledge for diagnosis schemes to handle unclear information in the diagnosis procedure. The proposed model uses inputs from the Supervisory Control and Data Acquisition (SCADA) system, data on the position and state of the switch, changes in current in the network element CB (NECB), start or trip action of a protection relay on the NECB, and alarm status of the CB. For the diagnostic system input variables, data from the SCADA system, along with transformer and line protection devices, are used to allow the proper formation of rules and ultimately to determine the diagnostic status of the CB. The proposed method is tested on an authentic test power system, and the outcome results are compared with a previously reported technique. The obtained test results and the comparison prove the efficiency, authenticity, and fast operation feature of the suggested strategy.
Highlights
The electrical power system is expanding and getting more complex throughout all its sectors—power generation, transmission and distribution, and load systems
This paper presents a new method for determining the availability of a circuit breaker state in real-time with a solution to the problems that have not been solved so far, and provides a significant increase in the security of the power system
It is important to note here that there are various methods for measuring phasor voltages or currents, the implementation of which could have high accuracy in determining the available switch states. These data and methods were not available to the authors when designing the application for the necessary determination of real-time Circuit breakers (CBs) availability, and only data from the Supervisory Control and Data Acquisition (SCADA) system and protection devices should be used
Summary
The electrical power system is expanding and getting more complex throughout all its sectors—power generation, transmission and distribution, and load systems. This paper presents a new method for determining the availability of a circuit breaker state in real-time with a solution to the problems that have not been solved so far, and provides a significant increase in the security of the power system. These faults cause electric flow disruption, equipment damage, bird and other animal deaths, and even possible human casualties. This paper tries to address the problems of determining the diagnostic state of highvoltage circuit breakers using fuzzy logic with the help of information from SCADA systems and protection devices in real-time network events, increasing the safety and reliability of the whole power system. The state estimator outputs a database from which any number of other devices and functions can be fed
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