| Project/Area Number |
62460113
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
電力工学
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
HARA Masanori Kyushu University, 工学部, 教授 (30039127)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SUEHIRO Junya Kyushu University, 工学部, 助手 (70206382)
KANEKO Tadamitsu Kyushu University, 工学部, 助手 (30136519)
|
|---|
| Project Period (FY) |
1987 – 1988
|
| Project Status |
Completed (Fiscal Year 1988)
|
| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥6,300,000 (Direct Cost: ¥6,300,000)
|
|---|
| Keywords | Ion flow injection / Space charge / Compartment gas insulated transmission line / DCUHV transmission line / Spacer / SF_6ガス / ガス絶縁 / 絶縁破壊 / 金属粒子 / 空間電荷効果 / イオン流茅電現象 / 洞道ガス絶縁 |
|---|
| Research Abstract |
In this work, ion flow field with respect to ion flow electroinjection phenomena under DCUHV lines and breakdown phenomena along the spacer surface in gas insulated system are investigated to find the similarity law in ion flow field and to find optimum electrode and spacer shapes under particle-contaminated condition in the gas insulated system.
The results can be summarized as follows.
1) The similarity law in ion flow field is clarified and formulated to find a control method of ion flow field and apply information on ion flow field obtained in an experimental setup to another setup with a different size.
2) Particle-initiated breakdown characteristics of conical spacers are measured and fundamental parameters determining the breakdown voltage of a dielectric spacer contaminated by metallic particles is found.
3) Breakdown mechanism along the spacer surface contaminated by a metallic particle is confirmed. That is, with shorter particles the discharge threshold field strength is higher than the field for the discharge propagation and the breakdown voltage is determined by the discharge threshold conditions, and with larger particles the relationship reverses.
4) Three methods for the improvement of insulation performance of particle contaminated spacer are proposed.:metal insert method, recessed electrode method and shield ring method. It is confirmed by the experiment that the proposed metal insert method is the best one and rises the breakdown voltage as high as about 50% in air and about 30% in SF_6 gas.
|
