Application of Partial Discharge Testing to Hydro Generator Maintenance

Kurtz, M.; Lyles, J.F.; Stone, G.C.

doi:10.1109/tpas.1984.318525

Cited by 95 publications

(26 citation statements)

References 6 publications

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“…However, as more exposed than neutral to noise from transformer and power system, extra noise suppression might be necessary for HV terminal detecting methods. Kurtz et al [49] modified the off-line test system described by Johnson [50] by replacing the large coupling capacitor with an appreciably smaller one of about 80 pF connected with a resistive detection impedance, which was the predecessor of the subsequent PD analyzer (PDA), i.e., HVCC. PDA includes differential and directional modes.…”

Section: Hv Terminal Detecting Methodsmentioning

confidence: 99%

“…If an internal circuit ring with sufficient length exists, the best installation is a differential mode, as shown in Figure 6a. One coupling capacitor per line end of each parallel is installed and helps to separate PD from noise stemmed from outside generator by time of arrival and pulse characteristics [49,51]. When there is insufficient circuit ring to install coupling capacitors at least 2 m apart, a directional installation is required, as shown in Figure 6b [51].…”

Section: Hv Terminal Detecting Methodsmentioning

confidence: 99%

“…Noise suppression by the balanced circuit or the use of two sensors in differential mode has been well developed and widely used in PD measurement [49,51], as illustrated in Figure 6. Based on the specific location of two sensors, it's valid to identity signals from internal or external of the generators.…”

Section: Hardware-based Denoisingmentioning

confidence: 99%

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A Review of Online Partial Discharge Measurement of Large Generators

Luo

Wang³

2017

Energies

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Abstract:Online partial discharge (PD) measurements have long been used as an effective means to assess the condition of the stator windings of large generators. An increase in the use of PD online measurement systems during the last decade is evident. Improvements in the detection capabilities are partly the reason for the increased popularity. Another reason has been the development of digital signal processing techniques. In addition, rapid progress is being made in automated single PD source classification. However, there are still some factors hindering wider application of the system, such as the complex PD mechanism and PD pulse propagation in stator windings, the presence of detrimental noise and disturbances on-site, and multiple PD sources occurring simultaneously. To avoid repetition of past work and to provide an overview for fresh researchers in this area, this paper presents a comprehensive survey of the state-of-the-art knowledge on PD mechanism, PD pulse propagation in stator windings, PD signal detection methods and signal processing techniques. Areas for further research are also presented.

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Section: Hv Terminal Detecting Methodsmentioning

confidence: 99%

Section: Hv Terminal Detecting Methodsmentioning

confidence: 99%

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A Review of Online Partial Discharge Measurement of Large Generators

Luo

Wang³

2017

Energies

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“…There has also been increasing interest by the electrical manufacturers and power utilities in the use of on-line PD monitoring as a diagnostic for locating incipient faults in cables [104], transformers [105], and rotating machinery [106]. Table 4 [129].…”

Section: Heatingmentioning

confidence: 99%

Measurement support for the U. S. electric-power industry in the era of deregulation, with focus on electrical measurements for transmission and distribution

FitzPatrick¹,

Olthoff²,

Powell³

1997

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“…For the Westinghouse method, PD currents are detected in the neutral grounding connection of the generator by means of an hf current transformer [7,8]. The partial discharge analyzer (PDA) developed by Ontario Hydro found worldwide application for hydro generators [9]. To discriminate between PDs and interference, for each phase two capacitive sensors are installed in the circuit-ring-bus.…”

Section: Introductionmentioning

confidence: 99%

Analysis and localization of abnormal partial discharge activity in generator units

Pemen¹,

Laan²

2006

Int Trans Elec Energy Syst

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SUMMARYThis paper describes methods to monitor partial discharges (PDs) of important power plant components, such as generator stator windings, generator circuit-breaker, and step-up transformer. Two methods have been evaluated under practical conditions, using various sensors: (i) time-domain measurements followed by signal-processing to discriminate between PDs and interference, and (ii) a tunable narrow-bandwidth filter which can be tuned to a frequency where PDs are strong and interference is weak. For several generators, abnormal PD activity was observed. In all cases, the source of these PDs could be located, by means of the transit-time between various sensors. Examples of identified abnormal discharge activity are: (i) discharge activity between phase separations of a statorwinding, (ii) sparking inside a step-up transformer, and (iii) large PDs in a generator circuit-breaker.

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Application of Partial Discharge Testing to Hydro Generator Maintenance

Cited by 95 publications

References 6 publications

A Review of Online Partial Discharge Measurement of Large Generators

A Review of Online Partial Discharge Measurement of Large Generators

Measurement support for the U. S. electric-power industry in the era of deregulation, with focus on electrical measurements for transmission and distribution

Analysis and localization of abnormal partial discharge activity in generator units

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