Summary
In recent years, with the deterioration of nature climate, haze occurred frequently in Beijing, China, especially in spring and winter seasons. During haze weather, the concentration of airborne particulate matter will turn higher, and it may have significant effects on high voltage power systems. When the electric field intensity on the surface of the HVDC conductors exceeds a critical value, corona discharges and produces a large number of ions. If airborne particulate matter, exists at this time in the vicinity of HVDC conductors, ions would adhere to these particulate matter, becoming charged particles, suspending and moving in air, further affecting the ionized field of the conductors. In order to investigate the impact about the concentration of airborne particulate matter on ionized field of HVDC power lines, a simulated overhead transmission line was constructed outdoor near our laboratory. During November to February (the winter season in Beijing), the negative dc experiments were carried out in fine and haze weather for several times. The concentration of airborne particulate matter was monitored by laser dust monitors LD-5C (B), which was in the range 20µg/m3 to 400µg/m3. The corona inception voltages could be obtained by the variations of dc ground synthetic electric field. In addition, the negative DC ground synthetic electric field was measured by three filed mills. Through a large number of observations and measurements, it is found that the airborne particulate matter has little effect on negative dc ground synthetic electric field before corona discharge occurred; however, the negative dc ground synthetic electric field became higher with the increase of the concentration of airborne particulate matter when the applied voltage exceeded corona inception voltage.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2017_243 |
| Publication year | |
| Publisher | ISH |
| File size | 453 KB |
| Pages number | 5 |
| Price for non member | Free |
| Price for member | Free |
