1 Introduction
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Investigate the effect of pollution severity on critical flashover voltage, electric field and potential distribution.
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Investigate the effect of dry band location and leakage distance on critical flashover voltage and electric field distribution.
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Study the hydrophobicity recovery property of silicone rubber insulators after performing flashover tests.
2 Experimental setup
3 Test method
4 Test samples
Pollution level | ESDD (mg/cm\(^{2}\)) | Volume conductivity (S/m) |
---|---|---|
Light | 0.035 | 1.4 |
Medium | 0.1 | 4 |
Heavy | 0.2 | 8 |
Very heavy | 0.4 | 16 |
5 Experimental results
5.1 Effect of pollution severity
Pollution severity | Flashover voltage (kV) | Standard deviation (%) |
---|---|---|
Clean and dry | 27.5 | 1.8 |
Clean and wet | 21.0 | 2.3 |
Light | 11.28 | 3.7 |
Medium | 10.2 | 2.5 |
Heavy | 8.7 | 3.2 |
Very heavy | 6.8 | 2.6 |
5.2 Effect of leakage distance
Leakage distance (cm) | Flashover voltage (kV) | Standard deviation (%) |
---|---|---|
1 | 1.3 | 3.2 |
2 | 2.7 | 4.0 |
3 | 4.0 | 2.9 |
4 | 5.35 | 3.1 |
5 | 6.45 | 3.0 |
6 | 8.0 | 4.5 |
7 | 9.17 | 2.8 |
8 | 10.25 | 2.7 |
Pollution severity | Dry band location | Flashover voltage (kV) | Standard deviation (%) |
---|---|---|---|
Light | HV | 12.3 | 2.2 |
Middle | 12.8 | 2.4 | |
GND | 12.4 | 2.2 | |
Medium | HV | 11.25 | 2.5 |
Middle | 11.8 | 2.2 | |
GND | 11.4 | 3.2 | |
Heavy | HV | 9.72 | 2.8 |
Middle | 10.3 | 2.6 | |
GND | 9.85 | 3.1 | |
Very heavy | HV | 7.8 | 2.5 |
Middle | 8.35 | 2.3 | |
GND | 7.9 | 2.8 |
5.3 Effect of dry band location
6 Simulation results
6.1 Electric field distribution
6.2 Potential distribution
Wavenumber \((\mathrm{cm}^{-1})\)
| Chemical bond | Virgin | 72 h | 48 h | 24 h | After the test |
---|---|---|---|---|---|---|
790–840 |
\(\hbox {Si}(\hbox {CH}_{3})_{2}\)
| 0.98 | 0.85 | 0.81 | 0.77 | 0.72 |
1000–1100 | Si–O–Si | 1.1 | 0.99 | 0.98 | 0.96 | 0.91 |
1255–1270 |
\(\hbox {Si}-\hbox {CH}_{3}\)
| 0.22 | 0.18 | 0.16 | 0.15 | 0.15 |
2960–2980 | CH | 0.040 | 0.037 | 0.044 | 0.038 | 0.032 |
3500–3700 | OH | 0.046 | 0.078 | 0.087 | 0.10 | 0.11 |
Wavenumber (cm\(^{-1})\)
| Chemical bond | Virgin | 72 h | 48 h | 24 h | After the test |
---|---|---|---|---|---|---|
790–840 |
\(\hbox {Si}(\hbox {CH}_{3})_{2}\)
| 0.98 | 0.88 | 0.82 | 0.8 | 0.74 |
1000–1100 | Si–O–Si | 1.1 | 1.04 | 1.04 | 0.99 | 0.93 |
1255–1270 |
\(\hbox {Si}-\hbox {CH}_{3}\)
| 0.22 | 0.19 | 0.18 | 0.16 | 0.16 |
2960–2980 | CH | 0.040 | 0.039 | 0.039 | 0.039 | 0.036 |
3500–3700 | OH | 0.046 | 0.06 | 0.066 | 0.088 | 0.094 |
Wavenumber (cm\(^{-1})\)
| Chemical bond | Virgin | 72 h | 48 | 24 h | After the test |
---|---|---|---|---|---|---|
790–840 |
\(\hbox {Si}(\hbox {CH}_{3})_{2}\)
| 0.98 | 0.88 | 0.82 | 0.8 | 0.74 |
1000–1100 | Si–O–Si | 1.1 | 1.05 | 1.06 | 0.99 | 0.93 |
1255–1270 |
\(\hbox {Si}\)–\(\hbox {CH}_{3}\)
| 0.22 | 0.19 | 0.18 | 0.16 | 0.17 |
2960–2980 | CH | 0.040 | 0.039 | 0.036 | 0.035 | 0.036 |
3500–3700 | OH | 0.046 | 0.062 | 0.066 | 0.088 | 0.094 |