Abstract
Cross-linked polyethylene (XLPE) has been widely used as cable insulation material because of its excellent dielectric properties, thermal stability and solvent resistance. To understand the influence of thermal aging on AC leakage current in XLPE insulation, all XLPE specimens were aged in oven in temperature range from 120 °C to 150 °C, and a series of tests were conducted on these XLPE specimens in different aging stages to measure the characteristic parameters, such as complex permittivity, leakage current and complex dielectric modulus. In the experiments, the effects of thermal aging, temperature and frequency on the AC leakage current in XLPE insulation were studied by analyzing complex dielectric constant and dielectric relaxation modulus spectrum, the change of relaxation peak and activation energy. It has been found that the active part of leakage current increases sharply with the increase of aging degree, and the test temperature and frequency have an influence on AC leakage current but the influence of test temperature is mainly reflected in the low frequency region. In addition, it has been shown by the experiments that the reactive part of leakage current exhibits a strong frequency dependent characteristic in the testing frequency range from 10-2 Hz to 105 Hz, but the influence of test temperature and thermal aging on it is relatively small.
Highlights
CROSS-LINKED polyethylene (XLPE) has been widely used as cable insulation material because of its excellent dielectric properties, thermal stability and solvent resistance
The increase of the conductivity and the enhancement of the interface polarization can cause the increase of the relaxation polarization loss and the conduction loss, the imaginary part of the complex dielectric constant increases with the increase of the test temperature
In order to further analyze the influence of thermal aging on the AC leakage current of XLPE insulation, on the basis of the above research work, the active and reactive parts of the leakage current in different thermal aging stages under the action of odd harmonics (≤1050 Hz) are extracted, and their growth multiples are calculated by taking the corresponding test results of the unaged samples as a base
Summary
CROSS-LINKED polyethylene (XLPE) has been widely used as cable insulation material because of its excellent dielectric properties, thermal stability and solvent resistance. XLPE cable is especially suitable for coal mine, petroleum exploitation and other industrial and mining enterprises with relatively poor production environment. The leakage current would endanger the personal safety. It’s easy to produce the electric spark and cause the major disasters in the hazard gas environment, such as gas explosion, gas combustion etc., which will directly threaten the production safety of industrial and mining enterprises.[3,4]
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