Partial discharge measurements and life estimation in DC electrical insulation during voltage transients and steady state

Ghosh, Riddhi; Seri, Paolo; Montanari, Gian Carlo

doi:10.1016/j.epsr.2021.107117

Cited by 23 publications

(12 citation statements)

References 18 publications

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“…As an example, Figure 4 shows the PD phenomenology for the same defect under DC steady-state voltage and AC sinusoidal voltage, just above the relevant PDIV (note that, according to (6) (7) and Figure 3, PDIV DC is generally much higher than PDIV AC at room temperature, for typical DC insulating dielectrics [12,13]). An expert, upon denoising (the patterns can be denoised by the innovative algorithm described in the next section) can recognise from the phase-resolved PD pattern that the PD source is an internal defect.…”

Section: Measuring Pd Under DCmentioning

confidence: 99%

“…Figure 10 reports an example of PD monitoring during energisation at room temperature, where the maximum DC voltage is lower than PDIVDC, but higher than PDIVAC [7]. Figure 10a shows PD pulse time and magnitude (TRPD pattern) together with the applied voltage, after noise has been removed and PD is recognised by the PC map of Figure 10b.…”

Section: Energisation and Voltage Polarity Inversion Of A Multi-layer...mentioning

confidence: 99%

“…where ε rb and ε rc are the relative permittivity of the dielectric and the cavity medium, h b and h c are the respective height, and ε 0 is the permittivity of free space (8:85 ⋅ 10 −12 F=m). The values of τ b and τ c can range from minutes to hours, thus they are much longer than those of the voltage transient time [4,7]. Figure 1 shows an example of time variation of electric field profile after application of a voltage step.…”

Section: Electric Field In Transient and Steady Statementioning

confidence: 99%

“…The difference is larger when the temperature gradient increases (note that in a homogeneous insulation, far from then cavity, the field profile does not change under isothermal conditions). It can be speculated reasonably that the extent and duration of electric field transient can affect PD occurrence and characteristics [4, 7]. Varying cavity location along insulation thickness is also an important factor conditioning PD inception, as shown by Figure 2.…”

Section: Electric Field In DC and Transient Conditions And Partial Di...mentioning

confidence: 99%

“…The time constant of the electric field, or dielectric time constant, in a cavity in series with the insulating dielectric can be described by [3]:

τ = τ_{normalb} \cdot τ_{normalc} \cdot \frac{(\frac{1}{ε_{normalb}} + \frac{h_{normalc}}{h_{b} . ε_{c}})}{(\frac{1}{γ_{normalb}} + \frac{h_{normalc}}{h_{b} . γ_{c}})}

where, τ b is the time constant associated to the dielectric, Equation (), and τ c is that of the cavity, Equation (), separately [1–3]:

τ_{normalb} = ε_{0} ε_{rb} / γ_{normalb} (T, E)

τ_{normalc} = ε_{0} ε_{rc} / γ_{normalc}

where

ε_{rb}

and

ε_{rc}

are the relative permittivity of the dielectric and the cavity medium,

h_{normalb}

and

h_{normalc}

are the respective height, and

ε_{0}

is the permittivity of free space (

8.85 \cdot 10^{- 12} F / m

). The values of

τ_{normalb}

and

τ_{normalc}

can range from minutes to hours, thus they are much longer than those of the voltage transient time [4, 7].…”

Section: Electric Field In DC and Transient Conditions And Partial Di...mentioning

confidence: 99%

See 4 more Smart Citations

An innovative approach to partial discharge measurement and analysis in DC insulation systems during voltage transient and in steady state

Montanari

Ghosh

2021

High Voltage

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Measuring partial discharges in DC insulation systems is an issue due to the lack of a reference relating the voltage waveform to the physics of discharge phenomena. Also, DC is not always steady state, due to voltage and load transients that generate electric field profile variations inside an insulation system, which can affect partial discharge inception likelihood and characteristics. Partial discharge measurement technology must be able to separate discharge pulses from noise and identify the type of sources generating partial discharge, which is related to condition assessment and maintenance. Eventually, measurement and analysis should be automatic and unsupervised, in order to get rid, partially or totally, of expert support. This study addresses a new approach to partial discharge measurements in DC insulation systems, presenting algorithms for separation, recognition and identification, which are effective both in DC steady state and during voltage (and load) transients. These algorithms are automatic and do not require expert support. Various cases of algorithm application on test objects consisting of multilayer polymeric specimens with an internal cavity and defective cable models are presented and discussed. Their effectiveness is proved, at least at a laboratory level, with effective noise separation and identification of discharge typology.

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Section: Measuring Pd Under DCmentioning

confidence: 99%

Section: Energisation and Voltage Polarity Inversion Of A Multi-layer...mentioning

confidence: 99%

Section: Electric Field In Transient and Steady Statementioning

confidence: 99%

Section: Electric Field In DC and Transient Conditions And Partial Di...mentioning

confidence: 99%

“…The time constant of the electric field, or dielectric time constant, in a cavity in series with the insulating dielectric can be described by [3]:

τ = τ_{normalb} \cdot τ_{normalc} \cdot \frac{(\frac{1}{ε_{normalb}} + \frac{h_{normalc}}{h_{b} . ε_{c}})}{(\frac{1}{γ_{normalb}} + \frac{h_{normalc}}{h_{b} . γ_{c}})}

where, τ b is the time constant associated to the dielectric, Equation (), and τ c is that of the cavity, Equation (), separately [1–3]:

τ_{normalb} = ε_{0} ε_{rb} / γ_{normalb} (T, E)

τ_{normalc} = ε_{0} ε_{rc} / γ_{normalc}

where

ε_{rb}

and

ε_{rc}

are the relative permittivity of the dielectric and the cavity medium,

h_{normalb}

and

h_{normalc}

are the respective height, and

ε_{0}

is the permittivity of free space (

8.85 \cdot 10^{- 12} F / m

). The values of

τ_{normalb}

and

τ_{normalc}

can range from minutes to hours, thus they are much longer than those of the voltage transient time [4, 7].…”

Section: Electric Field In DC and Transient Conditions And Partial Di...mentioning

confidence: 99%

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An innovative approach to partial discharge measurement and analysis in DC insulation systems during voltage transient and in steady state

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Ghosh

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Partial discharge diagnosis and remaining useful lifetime in XLPE extruded power cables under DC voltage: a review

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Partial discharge measurements and life estimation in DC electrical insulation during voltage transients and steady state

Cited by 23 publications

References 18 publications

An innovative approach to partial discharge measurement and analysis in DC insulation systems during voltage transient and in steady state

An innovative approach to partial discharge measurement and analysis in DC insulation systems during voltage transient and in steady state

Partial discharge diagnosis and remaining useful lifetime in XLPE extruded power cables under DC voltage: a review

Performance investigation of the new thermoelectric dehumidifier based on prefabricated cabin substation

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