Correlation between Dielectric Loss and Partial Discharge of Oil-Pressboard Insulation
Abstract
:1. Introduction
2. Test Setup and Measurement Procedure
2.1. Test Setup
2.2. Sample Preparation
2.3. Data Extraction
- apply 2 kV under which there is no PD. Record voltage and current signal for tanδ calculation;
- increase voltage with 1 kV step and keep it stable for 1 min;
- record PD and tanδ data for 5 min. Tanδ data is registered each 30 s, thus 10 data are gathered in 5 min. PD is measured every 6s with recording length of 20 ms, leading to 50 data;
- decrease the voltage to 2 kV and keep it for 1 min;
- keep the voltage to be 2 kV for 2.5 min while gathering tanδ data. 5 data are recorded with 30 s time step; and,
- repeat 2–5 until the voltage reaches 0.8 × Ub(flashover voltage). For sample group A, the stop voltage is 16 kV. For sample group B and C, the stop voltages are 14 kV and 12 kV.
3. Dielectric Loss and Partial Discharge Statistical Parameters
3.1. PD Statistical Parameters
3.2. Tanδ Statistical Parameters
4. Correlation between PD and Tanδ
4.1. Correlation between PD and tanδ Statistical Parameters
4.2. Correlation between PD and Δtanδ
- PDs occur symmetrically with respect to positive and negative cycles;
- square wave is used to simulate PDs;
- all PDs have the same amplitude, duration and repetition rate; and,
- in the positive cycle, the PDs are centered at 45°, while, in the negative cycle, the PDs are centered at 225°.
- PD amplitude A is set to 1. PD duration is set to be 10 μs. The time interval between each PD is 20 μs. The number of PDs is set to be 20, 40, and 60. Their effect to the frequency component is analyzed, as in Figure 20. It shows that, with the increase of PD number, the 50 Hz component is also increased.
- PD duration is set to be 10 μs. The time interval between each PD is 20 μs. The number of PDs is set to be 20. While PD amplitude A is set to be 1–3. Their effect on the frequency component is analyzed, as in Figure 21. Additionally, the amplitude rise will increase the 50 Hz component.
- PD amplitude A is set to 2. The time interval between each PD is 20 μs. The number of PDs is set to be 40. While PD duration varies as 10 μs, 20 μs, and 30 μs. Their effect on the frequency component is analyzed, as in Figure 22. Again, the duration enlargement will increase the 50 Hz component.
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Unit | Meaning |
---|---|---|
qt | pC | total discharge magnitude |
nt | - | total number of discharges |
qavg | pC | mean discharge magnitude |
qmax | pC | maximum discharge magnitude |
σ | ° | mean pulse width of discharge |
Sk | - | skewness of Hn(q) |
Ku | - | kurtosis of Hn(q) |
α | - | Weibull scale parameter of Hn(q) |
β | - | Weibull shape parameter of Hn(q) |
qt | nt | qavg | qmax | σ | Sk | Ku | α | |
---|---|---|---|---|---|---|---|---|
A | 0.728 | −0.734 | 0.767 | 0.712 | 0.962 | −0.734 | −0.818 | 0.718 |
B | 0.804 | −0.709 | 0.819 | 0.809 | 0.871 | −0.762 | −0.812 | 0.744 |
C | 0.837 | −0.708 | 0.808 | 0.796 | 0.847 | −0.770 | −0.837 | 0.766 |
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Li, Y.; Li, M.; Xie, J. Correlation between Dielectric Loss and Partial Discharge of Oil-Pressboard Insulation. Symmetry 2021, 13, 864. https://doi.org/10.3390/sym13050864
Li Y, Li M, Xie J. Correlation between Dielectric Loss and Partial Discharge of Oil-Pressboard Insulation. Symmetry. 2021; 13(5):864. https://doi.org/10.3390/sym13050864
Chicago/Turabian StyleLi, Yan, Min Li, and Jun Xie. 2021. "Correlation between Dielectric Loss and Partial Discharge of Oil-Pressboard Insulation" Symmetry 13, no. 5: 864. https://doi.org/10.3390/sym13050864
APA StyleLi, Y., Li, M., & Xie, J. (2021). Correlation between Dielectric Loss and Partial Discharge of Oil-Pressboard Insulation. Symmetry, 13(5), 864. https://doi.org/10.3390/sym13050864