Cellulosic particles accumulation phenomenon and its effect on the electric field distribution in natural ester and mineral oil under AC electric field

Figures & data

Table 1. Parameters of mineral oil and natural ester.

Parameter	Mineral oil	Natural ester
Density in kg/m^3 (20 °C)	0.890	0.910
Viscosity in mm^2/s (20 °C)	25.70	78.50
Permittivity (20 °C,50 Hz)	2.210	3.120
Volume Resistivity in Ω·m (20 °C)	1.074 × 10^13	3.327 × 10^10
tan δ in % (20 °C)	0.014	0.393

Figure 1. The experimental setup.

Figure 2. Cellulose particles accumulation in mineral oil (a)10 min-25 kV (b)120 min-25 kV.

Figure 3. Cellulose particles accumulation in natural ester (a) 10 min-25 kV (b) 120 min-25 kV.

Figure 4. Electrical field distribution in mineral oil and mineral oil contaminated by cellulose particles (a) mineral oil-35.35 kV (b) mineral oil-cellulose particles-35.35kV.

Figure 5. The electrical field distribution in natural ester and natural ester contaminated by cellulose particles under AC peak value (a) natural ester-35.35 kV (b) natural ester-cellulose particles-35.35kV.

Figure 6. The electric field distribution from the top of the left spherical electrode to the top of the right spherical electrode.

Figure 7. Electric field distribution from the top of the spherical electrode to the bottom of the electrode.