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Given that the features of different traditional fault location methods and the widespread use of FTU, a hybrid fault location method based on matrix and impedance method for power distribution systems is proposed in this paper. Firstly, the simulated fault current vector is formed by the FTUs' status and network topology. In this vector, the positive elements correspond to the faulted sections. So...
A single-terminal traveling wave fault location method for VSC-HVDC transmission lines based on S-transform is proposed. S-transform is applied to analyze the amplitude variation of the line-mode fault traveling wave signal on each frequency component. The moments corresponding to the modulus maximums of the high frequency components are exactly the traveling wave arrival times. Combining with the...
Hidden failure of protection relays is one of the important reasons of cascading failure and disconnection of power systems. It is significant to improve the reliability for protection. So far, the hidden failure remains undetected. An analytic model based on protection signals is proposed to detect hidden failures of protection relays in this paper. In this model, fault location, protection start...
Accurate fault location is beneficial for the stability of power distribution network. With the access of distributed energy resource, such as distributed generations, electric vehicles, controllable load and so on, traditional fault and protection device has been unable to completely adopt to the new situation of distribution network protection, which requires new technologies and devices. In this...
Most of the existing electrical techniques of condition monitoring and fault diagnosis are based on stator current and/or stray flux measurement external to the motor. In this paper we propose a new diagnosis method for rotor bar faults based on flux measurements inside the main air gap of large induction motors. Theoretical analysis is presented, of both healthy motor and a motor with a broken rotor...
This paper presents constraints involved in the microelectronic implementation of a transmission line model based on transconductor-capacitor (gm-C) topologies. The presented line model, based on the discretization of a transmission line into a finite number of series inductors and shunt capacitors, is aimed for the fault location in power network, a technique using the Electromagnetic Time-Reversal...
In this paper the fault location is presented in distribution systems with distributed generation using Support Vector Machines and information provided by smart meters located on the system. Different types of faults that can occur in a distribution system are simulated for fault resistances 5 to 30 Ohms in steps of 5 Ohms. Support Vector Machines were trained with effective voltage values measured...
Electric motors used in large mining machines (electric shovels, draglines) undergo dynamic stresses at high power levels. Their lifetime is reduced as compared to constant speed motors, and downtime costs are very high. To monitor condition of motors in such applications, advanced sensor instrumentation is considered, including installation of Hall effect flux sensors (HEFS) inside the motor air...
Since operation parameters along the high speed railway distribution system can be obtained from the Remote Terminal Units (RTUs) installed in the box-type substations, this paper proposes a novel strategy for fault location in high speed railway distribution system based on the voltage sag profiles. The proposed method matches the calculated voltage and measured voltage to locate the fault section...
DC fault current is contributed by various distributed energy resources in DC distribution systems. Most DC distribution systems have low line impedance. The fault current increases fast because of the low impedance. Some converters in DC distribution systems include Fault Current Limiting (FCL) function. The controlled fault currents at different locations are very close. Thus, it is important to...
Penning ion source was made for applying a compact neutron generator. Electrical and vacuum system was assembled to test the ion source. As a preliminary test, a hydrogen gas using a mass flow system was inserted to produce plasma into the ion source and the plasma was produced and the hydrogen ion beams were extracted successfully. Operation conditions such as anode voltage, pressure change, and...
The explosion by amount of codes as well as the swelling logic complexity have stifled the performance of the traditional fault-location methods since the resource adopted during this process is unacceptable. Under such a situation, a scheme to locate the faults in complex software more effectively has been proposed in this paper based on networks community theory. First, on the base of establishing...
In this research, germination enhancement of sunflower seeds by electrical methods has been proposed. The influence of non-thermal plasma and electric field treatment on germination improvement of sunflower seeds was studied. For the plasma-treated cases, sunflower seeds were irradiated by argon-oxygen plasma at the gas flow rate of 5:5 liter per minute. The experiments for electric field case, sunflowers...
Travelling wave based fault location uses arrival times of the fault generated travelling waves at the terminals of the line. These arrival times are extracted by using different signal processing tools like Discrete wavelet transform (DWT), S-Transform (ST). The accuracy of fault location is highly influenced by the uncertainties in arrival time measurements. In this paper, an artificial neural network...
In this paper, a detailed study and analysis has been done for investigating a technique for the location of fault in a long high voltage DC transmission line, say up-to 1000kms long. For achieving this, the paper proposes to use combination of two methods, first method is based on the travelling wave principle, and second method is wavelet transform. The wave-front i.e. the arrival time of the travelling...
The conventional protection relays based on local signals, can be greatly enhanced in modern power grids. This article proposes a novel two-stage hybrid online fault detection algorithm based on wide-area protection and limited PMUs by wide-area communication network. In first stage, the wide-area algorithm calculates the lines' relative fault degrees on wide-area backup protections. After sorting...
The small current grounding system has many problems: low ability of extinguishing arc grounding and personal sense of electric system, none security and protection ability to indirect grounding overvoltage, equipment internal fault grounding, the new type of fault line selection method in this paper based on active protection can effectively solve the above problems. This article first introduces...
In this paper, a functional damage evaluation system is designed and implemented. The rules of functional damage evaluation for equipment in smart substation follow the human experience problem handling. The electric wiring diagram of primary system and topological graph of secondary equipment are automatically generated. The information collected in online monitoring system is used to discover anomalies...
High voltage transmission line fault location algorithm without synchronization, which does not require sampling synchronization, reduces cost and has a higher practical engineering value. But the algorithm still needs to be improved in the false root identification of ranging equation, this paper makes a further research on this issue. Firstly, the false root problem of fault location algorithm without...
A novel method for fault location is proposed in this paper, which is based on fault voltages and currents sampled synchronously on both ends of the fault line. This algorithm is based on precise integration. Using the synchronous measurement data at the ends of the fault line, it computes the voltage along transmission line. Then comparing two groups of voltage, it can find out the location of trouble...
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