Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity
Abstract
:1. Introduction
2. Calculation of Electric Field Distribution on the Grading Ring Surface and Study on Its Influence Law
2.1. The Saddle Type Grading Ring
2.1.1. Calculation of Electric Field Distribution
2.1.2. Influence Law of Electric Field Distribution
2.2. The Elliptical and Circular Grading Ring
2.2.1. Calculation of Electric Field Distribution
2.2.2. Influence Law of Electric Field Distribution
3. The COI Tests of Grading Rings
3.1. The COI Test Results
3.2. The COI Test and Calculation Results Analysis
4. Prediction Method of the COI of an AC Grading Ring
4.1. Influence of Pipe Diameter on the COI of a Grading Ring
4.2. Influence of Ring Diameter on the COI of a Grading Ring
4.3. Prediction Formula of the COI
4.4. Verification of Prediction Formula
5. Conclusions
- (1)
- The calculation results of the MEI on the surface of saddle type and elliptical (circular) grading rings show that pipe diameter is the main factor affecting the MEI of grading rings with different structures. With continuous increase in pipe diameter, the MEI of the grading ring is gradually saturated.
- (2)
- The COI tests of grading rings are carried out in the UHV AC test base, and test results are compared with calculation results obtained based on the Peek formula, which shows that the Peek formula has a large error in predicting the COI of an AC grading ring.
- (3)
- Based on test results of the COI, a formula for predicting the COI of an AC grading ring in a plain area with an altitude of 100 m is proposed by considering the effect of both the pipe diameter and the ring diameter.
- (4)
- The COI of circular and elliptical grading rings with the same pipe diameter and ring diameter remains basically unchanged. Compared with pipe diameter, which has a more significant distortion effect on the COI of the grading ring, the ring diameter has less distortion effect on the COI of the grading ring.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Pipe Diameter (mm) | COV (kV) | COI (kV/cm) | Environmental Parameters | ||
---|---|---|---|---|---|
Atmospheric Pressure (kPa) | Temperature (°C) | Humidity (%) | |||
40 | 347 | 30.939 | 101.5 | 13.2 | 32 |
50 | 385 | 30.196 | 100.9 | 13.1 | 32 |
60 | 423 | 29.458 | 102.1 | 13.0 | 32 |
70 | 453 | 29.002 | 102.5 | 12.9 | 32 |
80 | 485 | 28.605 | 101.9 | 12.7 | 32 |
90 | 515 | 28.255 | 102.0 | 13.0 | 32 |
100 | 541 | 27.901 | 101.7 | 12.7 | 32 |
110 | 568 | 27.653 | 101.8 | 12.5 | 32 |
120 | 589 | 27.455 | 102.0 | 12.5. | 32 |
Ring Diameter (mm) | COV (kV) | COI (kV/cm) | Environmental Parameters | ||
---|---|---|---|---|---|
Atmospheric Pressure (kPa) | Temperature (°C) | Humidity (%) | |||
620 | 391 | 30.502 | 101.3 | 12.5 | 32 |
650 | 398 | 30.303 | 101.0 | 12.0 | 32 |
680 | 404 | 30.108 | 101.3 | 12.5 | 32 |
710 | 410 | 29.914 | 100.9 | 12.5 | 32 |
740 | 415 | 29.726 | 101.9 | 12.0 | 32 |
770 | 420 | 29.593 | 101.5 | 12.7 | 32 |
800 | 423 | 29.458 | 102.1 | 13.0 | 32 |
830 | 428 | 29.345 | 102.0 | 12.5 | 32 |
860 | 431 | 29.250 | 102.0 | 12.1 | 32 |
Length (mm) | COV (kV) | COI (kV/cm) | Environmental Parameters | ||
---|---|---|---|---|---|
Atmospheric Pressure (kPa) | Temperature (°C) | Humidity (%) | |||
1250 | 425 | 29.441 | 101.3 | 12.5 | 32 |
1450 | 427 | 29.409 | 101.0 | 12.5 | 32 |
Size of Grading Ring | COI (kV/cm) | |||
---|---|---|---|---|
Pipe Diameter (mm) | Ring Diameter (mm) | Test Data | Fitting Formula | Peek Formula |
80 | 680 | 28.82 | 28.47 | 25.30 |
80 | 820 | 28.47 | 28.21 | 25.30 |
50 | 800 | 30.23 | 29.85 | 26.19 |
70 | 800 | 28.87 | 28.68 | 25.53 |
90 | 800 | 28.19 | 27.87 | 25.10 |
Size of Grading Ring | Relative Error (%) | ||
---|---|---|---|
Pipe Diameter (mm) | Ring Diameter (mm) | Test Data and Fitting Formula | Test Data and Peek Formula |
80 | 680 | 1.21 | 12.21 |
80 | 820 | 0.91 | 11.13 |
50 | 800 | 1.26 | 13.36 |
70 | 800 | 0.66 | 11.57 |
90 | 800 | 1.14 | 10.96 |
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Liu, J.; Zhang, Z.; Jia, B.; Yan, X.; Wang, P.; Geng, J. Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity. Energies 2022, 15, 2041. https://doi.org/10.3390/en15062041
Liu J, Zhang Z, Jia B, Yan X, Wang P, Geng J. Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity. Energies. 2022; 15(6):2041. https://doi.org/10.3390/en15062041
Chicago/Turabian StyleLiu, Jie, Zhimeng Zhang, Boyan Jia, Xiaoliang Yan, Ping Wang, and Jianghai Geng. 2022. "Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity" Energies 15, no. 6: 2041. https://doi.org/10.3390/en15062041