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Capacitor voltage transformers (CVTs) are equipment widely deployed in power grids over 110 kV, which scale down high-voltage signals into low-voltage signals with a given coefficient [1]. Precisely sensing voltages in the power grid is the premise of downstream relaying, controlling, and metering. ... To sum up, existing detection methods have ...
Capacitor voltage transformers (CVTs) are equipment widely deployed in power grids over 110 kV, which scale down high-voltage signals into low-voltage signals with a given coefficient [1]. Precisely sensing voltages in the power grid is the premise of downstream relaying, controlling, and metering. ... To sum up, existing detection methods have ...
Detection Method of Partial Discharge on Transformer and Gas Insulated Switchgear: A Review
DOI: 10.1088/1361-6501/aaa6a0 Corpus ID: 116712121; An accurate on-site calibration system for electronic voltage transformers using a standard capacitor @article{Hu2018AnAO, title={An accurate on-site calibration system for electronic voltage transformers using a standard capacitor}, author={Chen Hu and Mianzhou Chen and Hongbin Li and Zhu Zhang and Yang …
The improved model based on GRU and MTL is abbreviated to ABG-MGRU with parameter settings shown in Table.1 nsidering that there are many model parameters, in order to save time and arithmetic power, we first use the empirical tuning method to manually adjust the parameters, and we can obtain a set of parameters that can guarantee stable convergence of …
The paper presents results of an analysis of inter-turn fault effects on the voltage and current waveforms of a capacitor discharge through transformer windings. The research was conducted in the frame of the Facility of Antiproton and Ion Research project which goal is to build a new international accelerator facility that utilizes superconducting magnets. For the sake of …
An automatic intelligent diagnosis method based on WHO-RNN architecture that can intelligently judge the cause of CVT fault through online data, and judge the fault location ofCVT as early as possible is proposed. Capacitor voltage transformer (CVT) is an important part of electric energy metering device. If the fault can not be located in time and repaired, it …
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Capacitor voltage transformer (CVT) is one of the most important instrument transformers widely used to prepare the voltage signal for control and protection equipment. The measuring accuracy of CVT plays an important role in the …
The conventional method of regular offline detection has the problems of power failure and operation difficulty. An online method for identifying errors in measurements of the CVT based on equivariant adaptive source separation is proposed in this paper. ... As a key device for signal acquisition in power systems, the capacitor voltage ...
At present, most of the winding fault detections of transformers use offline methods, which require the entire line to be powered off or after the transformer has been shut down due to a serious fault, and they cannot …
We first transform the detection task into an optimization problem where the number and location of breakdown capacitors are treated as decision variables, aiming to …
Detecting breakdowns in capacitor voltage transformers: A knowledge-assisted online approach. February 2024; ... source for the detection method attributed to its stable burden and high. accuracy.
DOI: 10.1109/ICSMD57530.2022.10058214 Corpus ID: 257527161; An online detection method for capacitor voltage transformer based on load classification @article{Zhang2022AnOD, title={An online detection method for capacitor voltage transformer based on load classification}, author={Yuxuan Zhang and Chuanji Zhang and Hongbin Li and Qing Chen and …
Lin et al. [] proposed a method for detecting the existence of capacitors on PCB using the YOLO algorithm.The recognition time of a single component can be as long as 294 milliseconds (219–710ms). Susa et al. [] proposed a method to detect the capacitor on the circuit board using YOLO V3. with the accuracy of (93.33%).Fan et al. [] proposed a three-stage …
To obtain the FDS test data curves of transformer bushings at different temperatures, the transformer bushings experiment platform was built in the laboratory. And the bushing samples at different temperatures was measured by FDS detection method, which started at 30 °C and rising at 10 °C intervals until the temperature reached 80 °C.
Evaluation results of this method. method exhibits certain advantages over prevailing online evaluation methodologies in terms of accuracy, reliability, and sensitivity in tracking changes and ...
Test Method: For detection, different types of coupling are used, for example, bushing capacitance taps, high-frequency current transformers or coupling capacitors. The test method outlined in IEC 60270 is a useful tool because it is a sensitive method and can be calibrated. Electromagnetic noise external to the transformer can interfere with ...
CVT is a voltage measuring device of the power grid. It transforms high voltage on the primary side into low voltage on the secondary side as show in Fig. 1, and the conversion coefficient of high and low voltage is its key parameter.
At present, most of the winding fault detections of transformers use offline methods, which require the entire line to be powered off or after the transformer has been shut down due to a serious fault, and they cannot detect the running status of the windings in real time and online. Since the transformer will be impacted by VFTO during operation, the VFTO is …
[4] Morais D R, Rolim J G, Coser J and Zurn H H 2006 Reliability centered maintenance for capacitor voltage transformers Int. Conf. on Probabilistic Methods Applied to Power Systems pp 1–6. Crossref; Google Scholar
The capacitive transducer with differential transformer bridge is widely used in ultra-sensitive space accelerometers due to their simple structure and high res. ... Resonant frequency detection and adjustment method for a capacitive transducer with differential transformer bridge M. Hu; M. Hu
At present, the detection of transformer winding deformation faults is carried out in an offline state, which requires the transformer to cooperate with the implementation of planned power outages, or it takes place after the sudden failure of the transformer when it is out of operation. It is difficult to obtain the status information of the windings online in time. Since …
To address the problem of insufficient real-time periodic calibration using standard transformers, this article proposes an online detection method for CVT measurement error based on enhanced integrated principal component analysis (EIPCA).
In this article, a method for the online detection of the excessive measurement error is proposed. With this method, the measurement error exceeding the limit of capacitor …
A capacitor voltage transformer (CVT) is widely used in high voltage power systems because of its good insulation performance. However, the structure of CVT is ... A new hybrid fault detection method for wind turbine blades using recursive PCA …
The experimental results show that the improved method is better than the traditional method in terms of the detection rate of transformer anomaly detection, can effectively detect the abnormal ...
In this article, an online detection method is proposed which combines multi-source heterogeneous data composed of CVT measurements, acceptance test errors, and …
Transformer partial discharge detection technology includes pulse current method, radio frequency measurement method, UHF method, ultrasonic detection method, gas chromatography, and optical ...
A detection method for overheating defective of bushing at the conductive tube was proposed. ... As shown in Fig. 1 (b), radial breakdown occurs between different capacitor foil layers of the RIP condenser ... analysis method is proposed in this paper based on the voltage and current Fourier spectrum analysis for the converter transformer valve ...
A novel method for detection and correction of errors in PMU measurements with the concept of calibration factors is presented, which uses nonlinear optimal estimation theory to calculate calibration factor using a traditional model of an untransposed transmission line with unbalanced load.
To address the limitations of traditional defect detection methods for power transmission lines, this paper proposes an intelligent defect recognition method based on self-adjusting Transformer. Firstly, a deterministic networking with a large receptive field is used to extract features from the defect images obtained during power transmission line inspections. …
Online Evaluation Method of CVT Internal Insulation Abnormality Based on Self-Supervised Learning. A capacitive voltage transformer (CVT) is one of the electrical quantities …
Capacitor voltage transformers are commonly used in power systems of 110 kV and above due to their good insulation performance and price advantage. They can provide a solid foundation for energy metering, state monitoring, and relay protection [1], [2]. ... An online detection method for capacitor voltage transformer with excessive measurement ...
The response of the proposed HIF detection framework under a capacitor switching ... C.M., Brito, N.S.D., de Souza, B.A., de Almeida Coelho, R., de Medeiros, H.G.M.S.: High impedance fault detection method based on the short-time Fourier transform. ... Lo E, Sutanto D (2005) High-impedance fault detection using discrete wavelet transform and ...
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