Peterson Coil Research Articles

Fault Handling and Localization Strategy Based on Waveform Characteristics Recognition with Coordination of Peterson Coil and Resistance Grounding Method

To address challenges in locating high-impedance grounding faults (HIGFs) and isolating fault areas in resonant grounding systems, this paper proposes a novel fault identification method based on coordinating a Peterson coil and a resistance grounding system. This method ensures power supply reliability by extinguishing the fault arc during transient faults with the Peterson coil. When a fault is determined to be permanent, the neutral point switches to a resistance grounding mode, ensuring regular distribution of zero-sequence currents in the network, thereby addressing the challenges of HIGF localization and fault area isolation. Fault calibration and nature determination rely on recognizing neutral point displacement voltage waveforms and dynamic characteristics, eliminating interference from asymmetric phase voltage variations. Fault area identification involves assessing the polarity of zero-sequence current waveforms attenuation during grounding mode switching, preventing misjudgments in grounding protection due to random initial fault angles and Peterson coil compensation states. Field experiments validate the feasibility of this fault location method and its control strategy.

Detection of single line to ground fault and self-extinguishing by using a variable and a fixedable inductance in distribution grid in power

This paper tackled the method for determining the number of Peterson coil which is can compensate with the capacitance because it is important in determining the state of parallel resonance, which in turn control the ground fault current and make the approximate value of the current equal to the current in the sound phases. In this way, we can protect the electrical devices and equipment from being damaged by residual current resulting from the arc due to ground fault, which increases the temperature of conductors which are to a breakdown of insulators and damaging them. Ground fault current equals three times the actual current, and its effect depends on two types of variables which are the first: the number of Peterson coils (which specify the inductance value and compensated) and second: the period time of extinguishing electric are in the ground fault. we obtain, by experimental in the lab where it using the servo motor to control the number of Peterson coils which in turn specify the variable and invariable inductance. We have obtained optimal results for the value of ground-fault current, detect the ground fault and treat it without effect of network load and without power cut off for consumer.

A Combined Method for Line Selection of Single Phase to Ground Fault in Compensated Distributions Based on Evidence Theory

In order to improve reliability of distributions, the neutrals are usually insulated or compensated with Peterson coil. Thus, the currents of single-phase to ground fault are weak, leading to difficulty in fault line selection problem. This paper investigates an evidence theory based integrated fault line selection method which employs multiple fault components to improve the performances of selection for neutral compensated distributions. Aim of this method is through the fusion strategy of the multi-fold unreliable fault components to arrive at more reliable solution. Three kinds of fault components including the transient, the abrupt changing, and the damped DC are developed. Fault measures are introduced for each line to quantitatively describe the likelihood of the line being the fault line. The fault components are extracted by dual-tree complex wavelet and atom decomposition. And the algorithms of calculating fault measures for the three components are developed according to the principle of the fault. The basic probability assignment (BPA) functions of evidence theory are established with the cloud model algorithm of data driven. Examples validate that through fusion algorithm of the multifold fault components, the line selection is more robust and reliable to varied circumstance than utilizing individual component.

Optimising transient earth fault protection in peterson coil and ungrounded systems

Optimising transient earth fault protection in peterson coil and ungrounded systems

Optimization of detection of a single line to ground fault based on ABCNN algorithm

One of the most faults found in the electrical distribution network is a single line to ground fault (SLGF). It can be detected and rectified through many methods. The utilization of Peterson coil (PC), reduces the electrical arcs and make the distribution network safe from damage in contrast to the cost value. This paper focuses on the method for its detection on higher and lower values of the ground fault current (GFC). Moreover, it will identify the capacitance and earth leakage of earthling network lines as well as calculate the opposing inductance to compensate for the cause. It also presents the selfextinguishing of GFC by controlling PC through one of the novel optimization techniques called adaptive and artificial bee colony with network neural (ABCNN) to improve the algorithm's performance, like optimization efficiency, speed, solution, and iteration. As a result, the determination of the GFC equals the sound phase current. Also, the extinguishing of an electric arc results in a short time compared with classical methods. The significant advantage of this research is the increment in the system's reliability, protection of devices as well as saving in copper cost. MATLAB was used to carry out this research. For the validity, the proposed algorithm results were compared with the classical method by creating faults on separate phases also.

Optimization of detection of single line to ground fault by controlling peterson coil through ANFIS

The most common fault in the distribution network is the single line to ground fault (SLGF). With earthling in the distribution network, it causes electrical arc as well as a high voltage in the faulted phase compared to other two healthy phases. It increases the danger of separation and isolation in the power network. One of the classical technique to control the arc is through Peterson Coil (PC), which detects and turns off/reduces the electrical arc making the network safer, increasing its reliability and device's safety. To control the PC, some of the techniques used in this research area are PID, FL, NN etc. This paper presents Adaptive Neural-Fuzzy Inference System (ANFIS) technique to controlling the PC. It gives the best results by detecting the fault, reducing the electrical arc and minimizing the fault current to the rated current in a very short time. Moreover, this research focuses on suppressing fault current by looking at its higher and lower peaks. Also, it calculates the opposing inductance to compensate the capacitance caused. It will save thousands of tons of copper costs. This research was conducted using MATLAB. For the validity of the proposed technique results, PID control technique was used.

Faulty feeder detection based on the composite factors in resonant grounding distribution system

Faulty feeder detection of the single-phase-to-ground fault in resonant grounding distribution system (GRDS) is faced with huge challenge due to weak fault current, and the existing methods indicate low reliability in some situations. For improvement, a new method based on composite factors is proposed in this paper. The composite factor is composed of transient factor and steady-state factor which are defined respectively according to transient process and steady-state component in the fault zero-sequence equivalent network. The transient factor of faulty feeder is much greater than those of healthy feeders, and the steady-state factor of faulty feeder is a constant and also much larger than those of healthy feeders when the series resistance of Peterson coil exists. However, the steady-state factors of all feeders are equal to 0 when the series resistance is short-circuited. Thus, a threshold value is constructed. By comparing the composite factors and the setting threshold, the faulty feeder can be detected. The correctness and adaptability of the proposed method are verified by simulations under various fault situations, such as different transition resistances, fault initial angles, fault distances, Gaussian white noises and compensated degrees. The tested results of experiment platform based on RTDS prove the correctness and feasibility of the proposed method.

Device for limiting single phase ground fault of mining machines

The paper shows the reasons and consequences of the single-phase ground fault. With all the variety of devices for limiting the current single-phase ground fault, it was found that the most effective are Peterson coils having different switching circuits. Measuring of the capacity of the network is of great importance in this case, a number of options capacitance measurement are presented. A closer look is taken at the device for limiting the current of single-phase short circuit, developed in the Far Eastern Federal University under the direction of Dr. G.E. Kuvshinov. The calculation of single-phase short-circuit currents in the electrical network, without compensation and with compensation of capacitive current is carried out. Simulation of a single-phase circuit in a network with the proposed device is conducted.

Detection of Single-Phase Grounding Fault Line Based on Fuzzy Set Theory

The complex single-phase grounding fault is researched in neutral insulated or Peterson coil earthed power networks. Traditional single fault line detection method only using some parts of fault information has poor adaptability and reliability. In this paper fuzzy set theory is introduced and applied in fault line detection. By setting subordinate functions and intelligently fusing all kinds of the fault information and all fault detection methods the property of detection is improved..It has shown that this fusion strategy exhibits excellent property over the existing criteria by dynamic mould laboratory emulation.

Study on the Performance of Distribution Grid System in Different Neutral Grounded Modes

In order to reduce grounded current and restrain arc-grounded over voltage during single-phase grounded faults in transmission line and realize fault-line selection, the neutral grounded mode with Peterson coil in parallel with big reactor is proposed in the paper. The simulation and comparative analysis of the performance of the 10 kV distribution grid systems in different neutral grounded modes have been done. The simulation results have shown that the neutral grounded mode via Peterson coil in parallel connection with big resistances can restrain the fault current effectively and it is the best mode.

Peterson Coils Based on Changing Magnetic Coupling to Control Reactance and its Application

After analysing the current state and existing problems of automatic resonance Peterson coil, a novel Peterson coil with three phases and five columns is presented to solve the high-order harmonic induced by regulating the firing angle of Thyristor-Controlled Reactor (TCR), which is based on changing magnetic coupling and flux to adjust inductance. The structure of this reactor is different from the traditional model, which adjusts inductance by altering the mutual inductance coupling quotiety. This paper also analyses the harmonics and volt-ampere characteristics of the arc suppression coil (ASC). The dual CPU hardware realisation and the turning principle of the ASC are also presented. The experiments show that this type of ASC has quick resonance speed, no high order harmonic, accurate tracing and automatic compensating capacitive current.

Experience with Resonant Grounding in a Large 34.5-kY System

Since early 1946, when grounding of the 34.5-kV system of the Wisconsin Michigan Power Company was established through installation of a Peterson coil, very complete records have been maintained with regard to all ground faults on the system. The results of an analysis of these records, covering 19 years of operation with resonant grounding, are contained in the paper. Resonant neutral grounding was selected because it promised the elimination of many voltage dips which, otherwise, would be the causes of interruptions in the manufacturing processes of many paper mills in the area of the utility company since paper mill drives are extremely sensitive to speed variations brought about by sudden voltage dips. Experiences with this kind of system grounding have been most satisfactory.

Lightning Arrester Discharge Currents

DURING the last five years an investigation has been made of the discharge currents of a number of 38,000-volt lightning arresters. The transmission system on which these arresters were installed is operated with its neutral point earthed through Peterson coils; the lines are not equipped with overhead ground wires. The earth lead of each single-phase arrester was equipped with a pair of magnetic links. In addition, paper-puncturing recorders were used to indicate when arresters had operated.