51 research outputs found
A Study on the Insulation Diagnosis of Vacuum Interrupter by the analysis of Partial Discharge
Personal injuries and property damages are significantly being increased due to electrical accidents related to vacuum circuit breakers (VCB) in switchgear. Therefore, researches on a diagnostic technique for vacuum interrupters (VI) which is a core part of the VCB and quenching an arc generated during opening and closing has been actively conducted both domestic and abroad.
In order to the insulation performance of the VI in the open state, partial discharge (PD) signals of each defect according to the applied voltage were measured using the KS C IEC 60270 method. The main defects that weaken the dielectric strength of the VI were classified into three types: leakage of vacuum, incomplete opening of the contact, and damage to the contact surface.
The measurement system consists of a maximum voltage 50 ใธ mold transformer, a 10,000: 1 voltage divider, an oscilloscope, and an MPD 600. A VI for the rated voltage 25.8 ใธ and an electrode system made of internal contacts from the same VI were used in th experiment. A 50ฮฉ non-inductive resistance (Oscilloscope) and an 1ใ coupling capacitor (MPD 600) were used to detect PD signal. The phase-resolved partial discharge (PRPD) method was used to analyze the PD characteristics such as discharge inception voltage (DIV), apparent discharge (), the number of pulses (), phase distribution (), and polarity ratio. Based on the PD characteristics of the open stated normal VI, the changes of the PD characteristics for each defect were analyzed and the effects of each defect on the deterioration of dielectric strength were derived.
Through the diagnostic methods and techniques proposed in this paper, it is possible to diagnose insulation of the VI in an open state in operation. Accordingly, it is expected that the safety of the VCB, which is most often used in the switchgear of high-voltage customers, can be secured to improve the reliability of power facilities.์๋ฐฐ์ ๋ฐ ๋ด ์ง๊ณต ์ฐจ๋จ๊ธฐ์ ๊ด๋ จ๋ ์ฌ๊ณ ์ฆ๊ฐ๋ก ์ธ๋ช
ํผํด์ ์ฌ์ฐํผํด๊ฐ ๋์ด๋๊ณ ์๋ค. ์ด์ ์ง๊ณต ์ฐจ๋จ๊ธฐ์ ํต์ฌ ๋ถํ์ผ๋ก์จ ๊ฐํ ์ ๋ฐ์๋๋ ์ํฌ๋ฅผ ์ํธํ๋ ์ง๊ณต ์ธํฐ๋ฝํฐ์ ๋ํ ์ง๋จ๊ธฐ์ (Diagnostic technique) ์ฐ๊ตฌ๊ฐ ๊ตญยท๋ด์ธ์์ ํ๋ฐํ ์งํ๋๊ณ ์๋ค.
์ง๊ณต ์ธํฐ๋ฝํฐ์ ๊ฐ๋ฐฉ ์ํ์์ ์ ์ฐ์ฑ๋ฅ ๊ฑด์ ์ฌ๋ถ๋ฅผ ์ง๋จํ๊ธฐ ์ํด KS C IEC 60270 ๋ถ๋ถ๋ฐฉ์ ๊ฒ์ถ๋ฒ์ ์ด์ฉํ์ฌ ์ธ๊ฐ์ ์์ ๋ฐ๋ฅธ ๊ฒฐํจ ๋ณ ๋ถ๋ถ๋ฐฉ์ ์ ์ธก์ ํ์๋ค. ์ง๊ณต ์ธํฐ๋ฝํฐ์ ์ ์ฐ๋ด๋ ฅ์ ์ฝํ์ํค๋ ์ฃผ์ ๊ฒฐํจ์ ์ง๊ณต๋์ค ๋ฐ ์ ์ ์ ๋ถ์์ ํ ๊ฐ๋ฐฉ, ์ ์ ํ๋ฉด์ ์์์ 3๊ฐ์ง๋ก ๋ถ๋ฅํ์๋ค.
์ธก์ ์์คํ
์ ์ต๋ ์ถ๋ ฅ์ ์ 50ใธ ๋ชฐ๋ ๋ณ์๊ธฐ, 10,000:1 ๋ถ์๊ธฐ, ์ค์ค๋ก์ค์ฝํ ๋ฐ MPD 600 ๋ฑ์ผ๋ก ๊ตฌ์ฑํ์๋ค. ์คํ์๋ ์ ๊ฒฉ์ ์ 25.8ใธ ์ง๊ณต ์ธํฐ๋ฝํฐ์ ๋์ผ ์ ํ์ ๋ด๋ถ ์ ์ ์ผ๋ก ์ ์ํ ์ ๊ทน๊ณ๋ฅผ ์ฌ์ฉํ์๋ค. ๋ถ๋ถ๋ฐฉ์ ๊ฒ์ถ์๋ 50โฆ ๋น์ ๋์ฑ์ ํญ(Oscilloscope)๊ณผ 1ใ ์ปคํ๋ง ์ปคํจ์ํฐ(MPD 600)๋ฅผ ์ฌ์ฉํ์๋ค. ๋ฐฉ์ ๊ฐ์์ ์(DIV), ๋ฐฉ์ ์ ํ๋(), ํ์ค๊ฐ์(), ์์๋ถํฌ() ๋ฐ ๊ทน์ฑ๋น์ ๊ฐ์ ๋ถ๋ถ๋ฐฉ์ ํน์ฑ์ PRPD(Phase-resolved partial discharge) ๋ฒ์ผ๋ก ๋ถ์ํ์๋ค. ์ ์ ์ง๊ณต ์ธํฐ๋ฝํฐ์์ ๊ฒ์ถ๋๋ ์ ํธ๋ฅผ ๊ธฐ์ค์ผ๋ก, ๊ฒฐํจ ๋ณ ๋ถ๋ถ๋ฐฉ์ ๊ฒ์ถํน์ฑ ๋ณํ๋ฅผ ๋ถ์ํ์ฌ ๊ฐ ๊ฒฐํจ์ ์ ์ฐ์ฑ๋ฅ ์ํฅ ์ ๋๋ฅผ ๋์ถํ์๋ค.
๋ณธ ๋
ผ๋ฌธ์์ ์ ์๋ ์ง๋จ ๋ฐฉ๋ฒ ๋ฐ ๊ธฐ์ ์ ํตํด ์ด์ฉ ์ค์ธ ๊ฐ๋ฐฉ ์ํ์ ์ง๊ณต ์ธํฐ๋ฝํฐ์ ์ ์ฐ ์ง๋จ์ด ๊ฐ๋ฅํ๋ค. ์ด๋ฅผ ํตํด ๊ณ ์ ์์ฉ๊ฐ์ ์๋ฐฐ์ ๋ฐ์ ๊ฐ์ฅ ๋ง์ด ์ฌ์ฉ๋๋ ์ง๊ณต ์ฐจ๋จ๊ธฐ์ ์์ ์ฑ์ ํ๋ณดํ์ฌ ์ ๋ ฅ ์ค๋น์ ์ ๋ขฐ๋๋ฅผ ํฅ์์ํฌ ์ ์์ ๊ฒ์ผ๋ก ๊ธฐ๋๋๋ค.์ 1 ์ฅ ์ ๋ก 1
์ 2 ์ฅ ์ด ๋ก 4
2.1 ์๋ฐฐ์ ๋ฐ 4
2.2 ๋ถ๋ถ๋ฐฉ์ 11
์ 3 ์ฅ ์คํ ๋ฐ ๋ฐฉ๋ฒ 18
3.1 ์คํ๊ณ 18
3.2 ๋ถ๋ถ๋ฐฉ์ ์ธก์ 23
์ 4 ์ฅ ๊ฒฐ๊ณผ ๋ฐ ๋ถ์ 25
4.1 ์ ์ ์ํ 25
4.2 ๊ฒฐํจ๋ณ ํน์ฑ 29
4.3 ๊ฒฐ๊ณผ ๊ณ ์ฐฐ 50
์ 5 ์ฅ ๊ฒฐ ๋ก 55
์ฐธ ๊ณ ๋ฌธ ํ 57Maste
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