Application of UHF method for partial discharge source location in power transformers

Dukanac, Đorđe

doi:10.1109/tdei.2018.006996

Cited by 61 publications

(30 citation statements)

References 37 publications

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“…As an effective PD source solution method, the time difference of arrival (TDOA) method has the advantages of simple principle and universal application . The TDOA method requires at least four sensors S i ( i = 1, 2, 3, 4), as shown in Fig.…”

Section: Error Analysis Of Pd Source Z‐coordinate With Plane Layout Umentioning

confidence: 99%

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Zhang

Cheng

et al. 2019

IEEJ Transactions Elec Engng

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In locating a transformer partial discharge (PD) source, there is a large fluctuation error in the z -coordinate of the location, which results with planar layout ultrahigh-frequency (UHF) antenna sensors. For the large fluctuation error, this paper first theoretically analyzes the reason. According to the theoretical analysis results, a ladder-wise calculation method of the PD source z -coordinate is proposed: first, the x -and y-coordinates of the PD source are calculated, then the univariate equation f (z ) is derived, and the z -coordinate of the PD source is obtained by f (z ). Finally, the positioning effect of the ladder-wise calculation method for PD source z -coordinate is verified experimentally. Experimental results show that the proposed method can reduce the fluctuation of the z -coordinate of the PD source from 0.6 to 0.2, and when the PD location sample set is ≥10, the average absolute error of the z -coordinate is reduced from about 0.4 m to less than 0.1 m.

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Section: Error Analysis Of Pd Source Z‐coordinate With Plane Layout Umentioning

confidence: 99%

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Zhang

Cheng

et al. 2019

IEEJ Transactions Elec Engng

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“…Ultra-high frequency (UHF) partial discharge measurement in power transformers is performed by using UHF sensors to measure electromagnetic (EM) waves that are generated during the partial discharge (PD) event and then propagate inside the tank until reaching the sensors. The method enjoys certain advantages over traditional electrical PD measurement, such as the possibility of three-dimensional source localization and continuous online monitoring [ 1 , 2 ]. However, improving localization accuracy requires understanding the propagation paths inside transformers, which are quite complex.…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

Beura

Beltle

Tenbohlen

2020

Sensors

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Ultra-high frequency (UHF) partial discharge (PD) measurements in power transformers are becoming popular because of the advantages of the method. Therefore, it is necessary to improve the basic understanding of the propagation of signals inside the transformer tank and the factors that influence the sensitivity of the measurement. Since the winding represents a major obstacle to the propagation of the UHF signals, it is necessary to study the effect of winding design on signal propagation. Previous research activities have studied these effects using simplified models, and it is essential to consider the complexity of propagation in a complete transformer tank. Additionally, the quality of UHF PD measurements depends, to a large extent, on the sensitivity of the UHF sensors. In this contribution, a simulation model consisting of a simple, grounded enclosure with multiple winding designs is used to study the propagation characteristics of UHF signals when an artificial PD source is placed inside the winding. After analysis of the results, the winding designs are incorporated in an existing and validated simulation model of a 420 kV power transformer and analyzed to observe the influence in a more complex structure. Two commonly used sensor designs are also used in the simulation model to receive the signals. In all cases, the propagation and signal characteristics are analyzed and compared to determine the influence of the winding and sensor design on the UHF signals. It is found that the level of detail of winding design has a significant impact on the propagation characteristics. However, the attenuation characteristics of the UHF signals received by the two sensor designs are similar, with the electric field distribution around the sensor being the key difference.

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“…PD measurement methods based on electrical, acoustic, chemical, and mechanical phenomena associated with the PD process have been used for many years as nondestructive offline or online techniques for insulation condition evaluation of high-voltage equipment [ 4 , 5 , 6 ]. These methods include the pulse current method (IEC 60270) [ 7 ], HF (3–30 MHz) [ 8 ], VHF (30–300 MHz) [ 9 ], UHF (300 MHz–3 GHz) method [ 10 , 11 , 12 ], the transient earth voltage (TEV) method [ 13 , 14 , 15 ], the acoustic emission method [ 16 , 17 , 18 ], and the oscillating wave test method [ 19 ]. The biggest challenges for continuous PD measurement of cable termination are low-cost and high-sensitivity sensors.…”

Section: Introductionmentioning

confidence: 99%

Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination

Zhao

Cao

Zhou

et al. 2020

Sensors

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Cable termination is a weak point in an underground cable system. The transient earth voltage (TEV) method is an effective and nonintrusive method for estimating the insulation condition of cable termination. However, the practical application of TEV detection is mainly focused on switchgears, generators, and transformers with a flat and conductive shell. A flexible sensor array based on the TEV method is presented for online partial discharge (OLPD) monitoring of the cable termination. Each sensing element is designed with a dual-capacitor structure made of flexible polymer material to obtain better and more stable sensitivity. Based on the electromagnetic (EM) wave propagation theory, the partial discharge (PD) propagation model in the cable termination is built to analyze and verify the rationality and validity of the sensor unit. Some influencing factors are discussed regarding the response characteristics of sensors. Finally, the performance of the sensor array is verified by simulations and experiments. Besides, an OLPD monitoring system is introduced. The monitoring system is composed of the on-site monitoring device and the remote monitoring host. The two parts of the system exchange the data through wireless networks using a wireless communication module. The experiment results show that the monitoring device could supply the PD condition monitoring demand for cable termination.

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Application of UHF method for partial discharge source location in power transformers

Cited by 61 publications

References 37 publications

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination

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