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Silicone rubber (SiR) is a kind of basic insulating material and is widely used to coat porcelain and glass high voltage insulators. In HVDC transmission lines, corona could occur occasionally, which can markedly inject the charges into insulators surface and damage the insulators. The existence of surface charge has a great effect on insulation degradation and plays an important role on dielectric...
Room temperature vulcanized (RTV) silicone rubber (SiR) is a kind of basic insulating material and is widely used to coat porcelain and glass high voltage insulators. In HVDC transmission lines, electric corona could take place even on well-designed hardware and insulators, which could make charge accumulate on the surface of insulators and inject into the surface. However, with the disadvantage of...
This study investigated the effects of dissolved oxygen (DO) and reflux ratio on the performance of nitrogen removal in a lab-scale bio film-A/O reactor. Results showed that higher DO and reflux ratio was favorable for nitrification in aerobic reactor, but was adverse for denitrification in anaerobic reactor. Under optimal DO concentration of 4 mg/Land sludge reflux ratio of 200%, the bio film-A/O...
Polyethylene (PE) was employed as test sample which was previously irradiated in air up to 100 kGy and then up to 1000 kGy with dose rate of 10 kGy / h by using a 60Co gamma-source. The sample surface was corona charged by applying a series of dc stresses on needle electrode which was set 6 mm above the surface. An electrostatic probe was designed to measure the surface charge density immediately...
Polybutylene naphthalate (PBN) was employed as test sample which was previously irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source. The experiment was carried out on sample surface under a negative dc stress between two parallel electrodes. An electrostatic probe was designed to measure the surface charge density during charging period...
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