a high accurate and low-voltage analog cmos current divider which operates with a single power supply voltage is designed in 0.18µm cmos standard technology. the proposed divider uses a differential amplifier and transistor in triode region in order to perform the division. the proposed divider is modeled with neural network while tlbo algorithm is used to optimize it. the proposed optimization...

Online monitoring of outdoor high voltage SF6 circuit breakers (HVCBs) is essential to detecting potential damages. To this end, the study accurate and non-invasive methods has been significantly investigated in recent decades. Considering that HVCB vibration patterns carry important information about mechanical electrical integrity analysis requires a low level invasiveness, article presents o...

The trip mechanism is a weakness in circuit breakers. Traditional fault identification based on the coil current difficult to report early mechanical defects such as coil-plunger jam. Here, vibration signal during process was extracted. Based and signal, characteristics of are analyzed. phase space reconstruction (PSR) method used extract features from signal. Combined with waveform, feature se...

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper is addressed a modelbased fault detection framework for vacuum circuit breaker by trip coil analysis. At first, the electromagnetic m...

Present Federal regulations which specify maximum instantaneous circuit breaker settings for the short-circuit protection of coal mine trailing cables are discussed. Characteristics of mine power systems, which limit short-circuit current in dc trailing cables and minimum expected short-circuit currents for dc 300 and 600 V trailing cables, are analyzed. New maximum instantaneous circuit breake...

Abstract In order to understand the influence of 750 kV power transmission and transformation project on electromagnetic radiation surrounding environment, data electric field intensity, magnetic intensity noise from substation equipment system in some areas Gansu Province were monitored analyzed. The results showed that near circuit breaker, switch reactance main producing high intensity. brea...

Influence of distributed generation systems in the distribution systems can increase the level of short-circuit current. The effectiveness of distributed generation systems is affected by the size, location, type of distributed generation systems technology, and the methods of connecting to distribution systems. Wind turbine system is the examples of distributed generation source. Not only does...

With the rapid development of arts of sensors and IT, on-line monitoring of circuit breaker is now desirable and practical for electric power utilities. This paper describes a set of overall on-line monitoring systems that was developed to control and monitor the condition of SF6 circuit breaker with different type of sensors and microcomputer based controller. The aim of the developed system i...