Enhancement of Service Life and Electrical Insulation Properties of Polymeric Cables With the Optimum Content of Aromatic Voltage Stabilizer

Abstract

This article presents the possibility of extending the service life of XLPE insulation based on high voltage cables by blending the optimum concentration of the aromatic voltage stabilizer. The insulation performance of XLPE is analyzed by adding the 0.5, 1, and 3 wt% of 3‐aminobenzoic acid voltage stabilizer. The investigated insulation properties include the DC step‐by‐step breakdown to estimate the life exponent, space charge, DC conductivity, surface potential decay, dielectric loss, and dielectric constant measurements. The results illustrate that the 1 wt% voltage stabilizer addition increases the life exponent from 10 up to 15, which is highly suitable for the high voltage cables. Moreover, it exhibits the negligible space charge accumulation and the least electrical field distortion inside the insulation bulk. It also exhibits the lower DC conductivity by one order of magnitude comparing to the pure XLPE. The highest bandgap value of 1 wt% addition further supports its better insulating properties. Furthermore, the dielectric measurements show that the XLPE with 1 wt% voltage stabilizer exhibits the least dielectric constant and dielectric loss. The differential scanning calorimetry and thermogravimetric analysis results show that the thermal properties are significantly improved after the voltage stabilizer addition. POLYM. ENG. SCI., 60:717–731, 2020. © 2020 Society of Plastics Engineers

Crosslinking Dependence of Direct Current Breakdown Performance for XLPE-PS Composites at Different Temperatures

“…Moreover, as shown in Figure 7 a, the melting peak temperature decreases gradually with the increase of DCP content. According to the Thomson-Gibbs equation, the thickness of lamellae for polyethylene can be calculated as follows: L = 2 σT m 0 /(Δ H v *( T m 0 − T m )) where L is the thickness of lamella in nm, σ is the lamellar surface free energy (0.07 J·m −2 ), T 0 m is equilibrium melting point of polyethylene (414.5 K), and Δ H v is the melting enthalpy of lamella with infinite thickness for polyethylene (2.88 × 10 8 J·m −3 ) [ 21 , 24 ], and T m is the measured melting peak point of samples in K. Therefore, a lower melting peak temperature corresponds to a thinner lamella, and the decrease of melting peak temperature with the increase of DCP content indicates that lamellae of composites tend to decrease.…”

“…where L is the thickness of lamella in nm, σ is the lamellar surface free energy (0.07 J•m −2 ), T 0 m is equilibrium melting point of polyethylene (414.5 K), and ∆H v is the melting enthalpy of lamella with infinite thickness for polyethylene (2.88 × 10 8 J•m −3 ) [21,24], and T m is the measured melting peak point of samples in K. Therefore, a lower melting peak temperature corresponds to a thinner lamella, and the decrease of melting peak temperature with the increase of DCP content indicates that lamellae of composites tend to decrease. As for crystallization process of composites, two peaks could be observed, shown in Figure 7b.…”

High density polyethylene and metal oxides based nanocomposites for high voltage cable application

“…The insulating characteristics of cross‐linked polyethylene (XLPE) was investigated using different amount of 3‐aminobenzoic acid voltage stabilizer 18 . It was shown that 1 wt% added stabilizer had drastically increased the life exponent (10 to 15), thermal stability, and melting properties; whereas, the dc conductivity, dielectric constant, and dielectric loss were reduced compared to base polymer.…”

Influence of polypyrrole nanospheres on the direct current dielectric properties of LDPE

“…The space charge distribution test of LDPE and LDPE/polypyrrole nanocomposites was carried out by pulse electro‐acoustic method, [ 17, 18 ] and silicone oil was used as acoustic coupling agent. The specimen with the thickness of about 300 μm was applied to a −40 kV/mm electric field for 40 min, and the space charge distributions at 1, 10, 20, 30, and 40 min were recorded.…”