Locating faults in a transformer winding: An experimental study

Satish, L.; Sahoo, Subrat Kumar

doi:10.1016/j.epsr.2008.05.020

Cited by 73 publications

(50 citation statements)

References 16 publications

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“…Although the leakage reactance of the affected coil changes with the relative position of the faulty turns within the winding [20], [28]- [29], this variation is small as compared to the fault impedance, in the case of incipient insulation defects, and no significant changes are detected in the primary-and secondary-side transformer currents. …”

Section: Transformer Behavior With Incipient Turn-to-turn Winding Faultsmentioning

confidence: 99%

Power transformers winding fault diagnosis by the on-load exciting current Extended Park's Vector Approach

Oliveira

Cardoso

Cruz

2011

Electric Power Systems Research

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Section: Transformer Behavior With Incipient Turn-to-turn Winding Faultsmentioning

confidence: 99%

Power transformers winding fault diagnosis by the on-load exciting current Extended Park's Vector Approach

Oliveira

Cardoso

Cruz

2011

Electric Power Systems Research

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“…Also, another of its limitations is the parameter-estimation method. In [23], it is supposed that each parameter varies within defined bounds. The step deviation of each parameter is fixed.…”

Section: Introducing Proposed Methods By Experimental Resultsmentioning

confidence: 99%

“…To achieve a realistic model of a transformer winding, self and mutual inductances must satisfy constraints in (4) and (5). In [23], a pseudo-code was used. It involved complex rules to estimate each of the self and mutual inductances.…”

Section: Introducing Proposed Methods By Experimental Resultsmentioning

confidence: 99%

On the accuracy of detailed model inductance matrix estimation for air core winding

Ahour

Seyedtabaii

Gharehpetian

2017

Archives of Electrical Engineering

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Abstract:Researchers have used various methods to determine the parameters of transformer-equivalent circuits in transient studies. But most of these previous algorithms had difficulty finding the equivalent circuit parameters in a bigger model. This paper presents a new method to extract the inductance matrix of a detailed model for an air core winding for transient studies using frequency-response measurement data. This matrix can be determined with acceptable accuracy by using the proposed method. The biggest advantage of the proposed method is a reduction in the search space, and thus, speedier problemsolving. Simulations showed that the use of the proposed method leads to better behavioural quality of a transformer winding. The simulation results of the previous and proposed methods were compared with the help of a 20/0.4 kV, 1600 kVA transformer. This comparison showed the accuracy and superiority of the proposed method.

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“…And the specific parameters of the model winding refers to [7]. The typical value of the bushing capacitance is 500 pF.…”

Section: A Simulationsmentioning

confidence: 99%

Experimental Investigating on on-line monitoring of insulation system of power transformers

Shen

Yin

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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The insulation system of the transformer is a critical aspect of its health condition and the failure of the insulation system can make the transformers out of service. HV bushings and windings are the most important components of the transformer insulation system and failure statistics show that bushings and windings are the two of the major reasons for transformer failures, which motivates operators for continuous on-line monitoring of their insulation condition. Partial discharge (PD) measurements are also an important tool to assess the condition of the insulation system of the transformers, including the bushings and windings. The paper adopts a simple but effective method to not only monitor the bushings and the windings' health condition but detect the PD of the transformer. The 600 KHz~1.2MHz sinusoidal signal based on direct digital synthesis (DDS), is applied on the bushings and the windings along with power frequency signal to assess the bushings and windings' health condition. Then the line-end and neutral-end high frequency currents are continuously measured by isolated precise current probes based on wide bandwidth Rogowski coils and related digital filtering methods. Meanwhile, the wide bandwidth Rogowski coils, which have double-channel outputs, can also detect the PD signals in the bushings and the windings. With the sinusoidal current data obtained from one channel of the probes, both the bushings' and the windings' insulation condition can be determined. And with the pulse current signal from PD obtained from the other channel of the probes, the PD of the bushings and the windings can be monitored all the time. Some simulations and experiments were made whose results showed that this detection method had high sensitivity and antiinterfere capability and it could wildly be used in insulation diagnose and partial discharge detection of power transformers.

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Locating faults in a transformer winding: An experimental study

Cited by 73 publications

References 16 publications

Power transformers winding fault diagnosis by the on-load exciting current Extended Park's Vector Approach

Power transformers winding fault diagnosis by the on-load exciting current Extended Park's Vector Approach

On the accuracy of detailed model inductance matrix estimation for air core winding

Experimental Investigating on on-line monitoring of insulation system of power transformers

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