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  1. (Division of Electrical and Electronic Engineering, Daejin University, Korea)



Partial discharge(PD), Pulse waveform, Simulation, XLPE cable, EBA, PMJ

1. ์„œ๋ก 

์ง€์ค‘์†ก์ „ XLPE ์ผ€์ด๋ธ”์˜ ๊ฑด์„ค ๋˜๋Š” ์šด์˜์‹œ ์‹ ๋ขฐ์„ฑ ํ™•๋ณด๋ฅผ ์œ„ํ•œ ํ˜„์žฅ ์ง„๋‹จ๋ฐฉ๋ฒ•์œผ๋กœ ๋ถ€๋ถ„๋ฐฉ์ „ ์ธก์ •์ด ๋ณดํŽธํ™” ๋˜๊ณ  ์žˆ์œผ๋ฉฐ, ํŠนํžˆ MHz ๋Œ€์—ญ ์ด์ƒ์˜ ๊ณ ์ฃผํŒŒ ๋Œ€์—ญ์—์„œ๋Š” ์ฃผ์œ„ ๋…ธ์ด์ฆˆ์— ๋น„ํ•ด ๋ถ€๋ถ„๋ฐฉ์ „ ์‹ ํ˜ธ์˜ S/N๋น„๊ฐ€ ๋†’์•„ ํšจ๊ณผ์ ์ธ ์ธก์ •์ด ์ด๋ฃจ์–ด์ง€๊ณ  ์žˆ๋‹ค. ๋ถ€๋ถ„๋ฐฉ์ „ ์ง„๋‹จ์€ ์ฒซ์งธ PRPD(Phase Resolved Partial Discharge) ๋ถ„์„๊ธฐ๋ฒ• ๋“ฑ์„ ํ† ๋Œ€๋กœ ์ธก์ •ํ•œ ๋ถ€๋ถ„๋ฐฉ์ „์˜ ํŒจํ„ด์ธ์‹์„ ํ†ตํ•ด ๋ถ€๋ถ„๋ฐฉ์ „ ๋ฐœ์ƒ์˜ ๊ฐ€๋Šฅ์„ฑ์„ ํŒŒ์•…ํ•˜๊ณ , ๋ถ€๋ถ„๋ฐฉ์ „ ์œ„์น˜ ์ถ”์ •์„ ํ†ตํ•ด ๊ทธ ์œ„์น˜์˜ ์ ˆ์—ฐ๊ตฌ์กฐ์— ๋”ฐ๋ฅธ ๋ถ€๋ถ„๋ฐฉ์ „ ํŒจํ„ด ๋„์ถœ ๊ฐ€๋Šฅ์„ฑ์„ ๋ถ„์„ํ•˜์—ฌ, ๋ถ€๋ถ„๋ฐฉ์ „ ์ง„๋‹จ์ด ์ˆ˜๋ฆฝ๋˜์–ด์•ผ ํ•œ๋‹ค.

์ด๋Ÿฌํ•œ ์ธก๋ฉด์—์„œ, TF(Time-Frequency) ๊ธฐ๋ฒ•(1), ํŽ„์ŠคํŒŒํ˜• ํŠน์„ฑ๋ถ„์„๊ธฐ๋ฒ•(2) ๋“ฑ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์˜ ํŠน์ง•์„ ์ถ”์ถœํ•˜์—ฌ ๋…ธ์ด์ฆˆ๋ฅผ ์ œ๊ฑฐํ•˜๊ฑฐ๋‚˜, 3PARD(3 Phase Amplitude Related Diagram) ๊ธฐ๋ฒ•(3) ๋“ฑ 3์ƒ ๋™์‹œ ์ธก์ •์‹ ํ˜ธ๋ฅผ ๋น„๊ตํ•˜์—ฌ ๋…ธ์ด์ฆˆ๋ฅผ ์ œ๊ฑฐํ•˜๋Š” ๊ธฐ๋ฒ•์„ ํ†ตํ•ด ํ˜„์žฅ ๋ถ€๋ถ„๋ฐฉ์ „ ํŒจํ„ด์ธ์‹์˜ ์ •ํ™•๋„๋ฅผ ์ œ๊ณ ํ•˜๊ณ  ์žˆ๋‹ค. ์•„์šธ๋Ÿฌ, TDR(Time Domain Reflectometry)(4) ๋˜๋Š” 2๊ฐœ ์„ผ์„œ๋ฅผ ์ด์šฉํ•œ TOA(Time of Arrival) ๊ธฐ๋ฒ• ๋ฐ ์‹œ๊ฐ„์ฐจ ๋ถ„์„ ๊ธฐ๋ฒ•(5) ๋“ฑ์„ ํ†ตํ•ด ๋ถ€๋ถ„๋ฐฉ์ „ ๋ฐœ์ƒ ์œ„์น˜์— ๋Œ€ํ•œ ๋ถ„์„์œผ๋กœ ๋ถ€๋ถ„๋ฐฉ์ „ ์œ„์น˜์ถ”์ •๊ณผ ์ง„๋‹จ ์ •ํ™•๋„๊ฐ€ ํ–ฅ์ƒ๋˜๊ณ  ์žˆ๋‹ค.

๊ทธ๋Ÿฌ๋‚˜, ์•„์ง๋„ ํ˜„์žฅ์—๋Š” ๋งŽ์€ ์™ธ๋ถ€ ๋…ธ์ด์ฆˆ์™€ ๋ถ€ํ•˜ ๋…ธ์ด์ฆˆ๋กœ ์ธํ•ด ๋ช…ํ™•ํ•œ ๋ถ€๋ถ„๋ฐฉ์ „ ์ง„๋‹จ์ด ์–ด๋ ค์šธ ๋ฟ ์•„๋‹ˆ๋ผ, ํŠนํžˆ EBA์™€ ๊ฐ™์ด ์„ผ์„œ๋ฅผ ์ ‘์†ํ•จ ์–‘๋‹จ์— ์„ค์น˜ํ•  ์ˆ˜ ์—†๋Š” ๊ฒฝ์šฐ๋‚˜ ์ ˆ์—ฐ์ ‘์†ํ•จ์˜ ํฌ๋กœ์Šค๋ณธ๋”ฉ๊ณผ ๊ฐ™์ด ์‹ ํ˜ธ์˜ ์ „ํŒŒ๊ฐ€ ๋ณต์žกํ•œ ๊ฒฝ์šฐ์—๋Š” ์œ„์น˜์ถ”์ •์ด ์–ด๋ ค์›Œ ๊ฐœ์„ ๋ฐฉ์•ˆ์ด ์š”๊ตฌ๋˜๊ณ  ์žˆ๋‹ค.

๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์€ ๊ฒฐํ•จ์˜ ์ข…๋ฅ˜์— ๋”ฐ๋ผ ํŒŒํ˜•์ด ์˜ํ–ฅ์„ ๋ฐ›์ง€๋งŒ ๋Œ€์ฒด๋กœ ns ์ˆ˜์ค€์˜ ๋งค์šฐ ๋น ๋ฅด๊ณ  ์งง์€ ํŽ„์Šค์˜ ํ˜•ํƒœ๋กœ์„œ(6,7), ์‹ค์ œ ์ผ€์ด๋ธ”์—์„œ ์ธก์ •๋˜๋Š” ใŽฒ ์ˆ˜์ค€์˜ ๊ธด ํŒŒํ˜•๊ณผ๋Š” ๋‹ค๋ฅด๋‹ค. ์ด๊ฒƒ์€ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์ด ๊ฒฐํ•จ์˜ ์ข…๋ฅ˜์— ์˜ํ•œ ๊ฒƒ ๋ณด๋‹ค๋Š” ์ „ํŒŒ ๊ฒฝ๋กœ์— ๋”ฐ๋ผ ํฌ๊ฒŒ ์ขŒ์šฐ๋˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ํŠนํžˆ ์ผ€์ด๋ธ”์˜ ์ ‘์† ๋ถ€๋ถ„์€ ๋‹ค์–‘ํ•œ ์ข…๋ฅ˜์˜ ์ ˆ์—ฐ์ฒด์™€ ๊ตฌ์กฐ๋ฅผ ๊ฐ–๊ธฐ ๋•Œ๋ฌธ์— ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๊ฐ€ ๊ฒฐํ•จ์—์„œ ๋ฐœ์ƒํ•˜์—ฌ ์„ผ์„œ๋กœ ์ž…๋ ฅ๋˜๊ธฐ๊นŒ์ง€ ๊ฒฝ๋กœ์— ์กด์žฌํ•˜๋Š” ๋‹ค์–‘ํ•œ ์ž„ํ”ผ๋˜์Šค๋ฅผ ๊ฑฐ์น˜๊ฒŒ ๋˜๋ฉฐ ์—ฌ๊ธฐ์„œ ๊ฐ์‡  ๋ฟ ์•„๋‹ˆ๋ผ ๋ฐ˜์‚ฌํŒŒ๊ฐ€ ๋ฐœ์ƒํ•˜์—ฌ ์ด๋“ค์ด ํ•ฉ์„ฑ๋˜์–ด ํŒŒํ˜•์ด ๋งŒ๋“ค์–ด์ง€๊ฒŒ ๋œ๋‹ค.

์ฆ‰, ์‹ค์ œ ์ˆœ์ˆ˜ํ•œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์€ ํŽ„์Šค์˜ ๋งจ ์•ž ๋ถ€๋ถ„ ์•„์ฃผ ์งง์€ ํ”ผํฌ์ด๊ณ  ๋‚˜๋จธ์ง€๋Š” ๋ฐ˜์‚ฌํŒŒ์— ์˜ํ•œ ๊ฒƒ์ด๋‹ค. ์ด์ฒ˜๋Ÿผ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์€ ์ ˆ์—ฐ์‹œ์Šคํ…œ์˜ ๊ตฌ์„ฑ์— ๋”ฐ๋ผ ๊ฒฐ์ •๋œ๋‹ค. ์ผ€์ด๋ธ”์˜ ๊ฒฝ์šฐ, EBA(End Bushing in Air), EBG(End Bushing in Gas), EBO (End Bushing in Oil) ๋“ฑ์˜ ๋‹จ๋ง ๋˜๋Š” PMJ(Pre-Moulded Joint) ๋ฐ PJ(Prefabricated Joint) ๋“ฑ์˜ ์ค‘๊ฐ„์ ‘์†ํ•จ์—์„œ ๊ฐ๊ฐ์˜ ์ž„ํ”ผ๋˜์Šค ํŠน์„ฑ์ด ๋‹ค๋ฅธ ๋งŒํผ ์—ฌ๊ธฐ์— ์กด์žฌ ๊ฐ€๋Šฅํ•œ ๊ฒฐํ•จ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ถ€๋ถ„๋ฐฉ์ „์˜ ํŒŒํ˜•์€ ๊ฐ๊ฐ ์–ด๋Š ์ •๋„ ์ •ํ˜•ํ™”๋  ์ˆ˜ ์žˆ๋‹ค๊ณ  ์ถ”์ •๋œ๋‹ค.

์ตœ๊ทผ FDTD(Finite Difference Time Domain) ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ํ†ตํ•ด ์ „๋ ฅ์„ค๋น„ ๋‚ด์—์„œ ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ์ธก๋ฉด์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „์ด ์ „ํŒŒ๋˜๋Š” ํŠน์„ฑ์„ ํ•ด์„ํ•˜๋Š” ์—ฐ๊ตฌ๊ฐ€ ์ „๋ ฅ์šฉ ๋ณ€์••๊ธฐ๋ฅผ ์ค‘์‹ฌ์œผ๋กœ ์ˆ˜ํ–‰๋˜๊ณ  ์žˆ์–ด(8) ๋ถ€๋ถ„๋ฐฉ์ „ ์ง„๋‹จ์˜ ์ •ํ™•์„ฑ์„ ๋†’์ด๊ณ ์ž ์ถ”์ง„๋˜๊ณ  ์žˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜, ์ผ€์ด๋ธ” ๋ถ„์•ผ์—์„œ ์ด์— ๋Œ€ํ•œ ์—ฐ๊ตฌ๋Š” ๋ฏธํกํ•œ ์‹ค์ •์ด๋‹ค.

์ด์— ๋”ฐ๋ผ ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ๋Œ€ํ‘œ์ ์ธ ์ง€์ค‘์†ก์ „ XLPE ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ์˜ ์ ‘์†ํ•จ์ธ EBA ๋ฐ PMJ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์— ๋Œ€ํ•ด ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์ˆ˜ํ–‰ํ•˜๊ณ  ํ˜„์žฅ ์ธก์ •๊ฒฐ๊ณผ์™€ ๋น„๊ตํ•˜์—ฌ ํ˜„์žฅ ๋ถ€๋ถ„๋ฐฉ์ „ ์ธก์ •์˜ ์ •ํ™•์„ฑ์„ ๋†’์ด๊ณ ์ž ํ•˜์˜€๋‹ค.

2. ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋ฐฉ๋ฒ•

2.1 FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ์•Œ๊ณ ๋ฆฌ์ฆ˜

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์†ก์ „ XLPE ์ผ€์ด๋ธ” ์ ‘์†ํ•จ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜•์— ๋Œ€ํ•œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์œผ๋กœ ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„์— ๋Œ€ํ•œ ์ „์žํŒŒ ์ „์†ก์„ ๋‹ค๋ฃจ์–ด์•ผ ํ•˜๋ฏ€๋กœ ์ด์— ๊ฐ€์žฅ ์ ์ ˆํ•œ ํ•ด์„๋ฐฉ๋ฒ•์ธ FDTD(Finite Difference Time Domain) ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ธฐ๋ฒ•(9)์„ ์ ์šฉํ•˜์˜€๋‹ค. FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ธฐ๋ฒ•์—์„œ๋Š” ๋งฅ์Šค์›ฐ ๋ฐฉ์ •์‹์˜ ํŽธ๋ฏธ๋ถ„์„ ์ด์šฉํ•˜์—ฌ ์ง๊ฐ ์ขŒํ‘œ๊ณ„์˜ ๊ธฐํ•˜ํ•™์ ์ธ ์˜์—ญ ๋‚ด ๊ตฌ์กฐ๋ฌผ์„ ์œ ํ•œ ๊ฐœ์ˆ˜์˜ Yee cell๋กœ ๊ตฌ์„ฑ๋œ ์˜์—ญ์œผ๋กœ ๋‚˜๋ˆ„๊ณ  ์ด์›ƒํ•˜๋Š” ๊ฐ cell ์‚ฌ์ด์˜ ์—ญํ•™๊ด€๊ณ„๋ฅผ ์‹œ๊ฐ„์˜์—ญ์— ๋Œ€ํ•ด ๋ฐ˜๋ณต์ ์œผ๋กœ ๊ณ„์‚ฐํ•˜์—ฌ ์ „์ž๊ณ„๋ฅผ ๋ถ„์„ํ•œ๋‹ค.

๊ทธ๋ฆผ. 1์€ ๋‹จ์œ„ Yee cell์„ ํ‘œํ˜„ํ•œ ๊ฒƒ์ด๋‹ค. ๋‹จ์œ„ Yee cell์€ ์ง์‚ฌ๊ฐํ˜• ํ˜•ํƒœ๋ฅผ ๊ฐ€์ง€๋ฉฐ, ์ „๊ณ„ ๋ฐ ์ž๊ณ„๋กœ ๊ตฌ์„ฑ๋˜์–ด ์žˆ๋‹ค. ์ง์‚ฌ๊ฐํ˜• ํ˜•ํƒœ์˜ ๊ฒฉ์ž๋Š” ์ž„์˜์˜ ์ขŒํ‘œ(i, j, k)๋กœ ๊ตฌ์„ฑ๋˜์–ด ์žˆ๋‹ค. ์ง์‚ฌ๊ฐํ˜•์˜ ๋ชจ์„œ๋ฆฌ์˜ 1/2 ์ง€์ ์—๋Š” ์ „๊ณ„ ๋ฒกํ„ฐ๊ฐ€ ์กด์žฌํ•˜๋ฉฐ, ์ง์‚ฌ๊ฐํ˜•์˜ ๊ฐ ๋ฉด์˜ ์ค‘์•™์ ์—๋Š” ์ž๊ณ„ ๋ฒกํ„ฐ๊ฐ€ ์กด์žฌํ•œ๋‹ค.

๊ทธ๋ฆผ. 1. FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜์˜ Yee cell ๊ตฌ์กฐ

Fig. 1. Yee cell structure of FDTD simulation

../../Resources/kiee/KIEE.2018.67.1.75/fig1.png

์ผ๋ฐ˜์ ์œผ๋กœ ์ •ํ™•ํ•œ ๊ทผ์‚ฌํ•ด ๊ฐ’์„ ์–ป๊ธฐ ์œ„ํ•œ Yee cell์˜ ํฌ๊ธฐ๋Š” ์ž…๋ ฅ๋˜๋Š” ํŽ„์Šค ํŒŒ์žฅ์˜ 1/10 ์ •๋„์˜ Yee cell์„ ๊ตฌ์„ฑํ•  ๊ฒฝ์šฐ ๋น„๊ต์  ์ •ํ™•ํ•œ ๊ทผ์‚ฌํ•ด๋ฅผ ๊ตฌํ•  ์ˆ˜ ์žˆ๋‹ค. ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์œ„ํ•ด Lumerical ์‚ฌ์˜ ๋ฒ”์šฉ S/W์ธ โ€˜FDTD Solutionsโ€™๋ฅผ ์ด์šฉํ•˜์˜€๋‹ค.

2.2 โ€˜FDTD Solutionsโ€™ ๋ฒ”์šฉ S/W์— ๋Œ€ํ•œ ์‚ฌ์ „ ๊ฒ€์ฆ

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” โ€˜FDTD Solutionsโ€™ ๋ฒ”์šฉ S/W๋ฅผ ์ด์šฉํ•˜์—ฌ ๋ถ€๋ถ„๋ฐฉ์ „ ํŠน์„ฑํ•ด์„์„ ์ฒ˜์Œ ์‹œ๋„ํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ๊ธฐ๋ณธ์ ์œผ๋กœ ์ผ€์ด๋ธ”์— ์ ์šฉ๋  ์ˆ˜ ์žˆ๋Š”์ง€ ๋‹ค์Œ๊ณผ ๊ฐ™์€ ์‚ฌ์ „ ๊ฒ€์ฆ์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

๊ธฐ๋ณธ์ ์œผ๋กœ XLPE ์ผ€์ด๋ธ”์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค์˜ ์ „ํŒŒ์†๋„๋Š” 165~170[m/ใŽฒ] ์ •๋„์ด๋ฉฐ(10), ๋„์ฒด, ์ ˆ์—ฐ์ฒด ๋ฐ ๋ฐ˜๋„์ „์ธต์˜ ๋‘๊ป˜์™€ ๋ฌผ์„ฑ์น˜์— ๋”ฐ๋ผ ๋‹ฌ๋ผ์ง„๋‹ค. โ€˜FDTD Solutionsโ€™ ๋ฒ”์šฉ S/W๋ฅผ ์ด์šฉํ•˜์—ฌ ์ด๋Ÿฌํ•œ ๊ฒฐ๊ณผ๊ฐ€ ๋„์ถœ๋˜๋Š”์ง€ ๊ฒ€์ฆํ•˜๊ธฐ ์œ„ํ•ด ํ‘œ 1๊ณผ ๊ฐ™์ด ์ ์šฉํ•˜์—ฌ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

ํ‘œ 1. XLPE ์ผ€์ด๋ธ” FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ์ ์šฉ ๋ฌผ์„ฑ์น˜

Table 1. Values of FDTD simulation for XLPE cables

Standard* Sunny Subjects

(N = 5)

Cloudy Subjects

(N = 5)

Subjects

Age

Twenty

26.0

ยฑ2.55

25.4

ยฑ3.05

25.56

ยฑ2.79

Height

175.8

ยฑ5.38

173.6

ยฑ2.30

173.6

ยฑ5.86

174.0

ยฑ4.24

Weight

75.6

ยฑ10.78

67.4

ยฑ5.55

69.2

ยฑ6.10

69.0

ยฑ5.43

BMI

18.5

~22.9

17.54

ยฑ2.42

20.04

ยฑ4.31

19.04

ยฑ3.66

Pulse

50

~100

68.0

ยฑ7.35

73.4

ยฑ8.32

69.67

ยฑ7.66

Blood

pressure

120/80

119.4

/75.0

(ยฑ7.23

/8.06)

126.2

/73.4

(ยฑ10.06

/7.67)

123

/74.22

(ยฑ9.53

/7.92)

*PEC : Perfect Electric Conductor(์™„์ „๋„์ฒด๋กœ ๋„์ „์œจ ๋ฌดํ•œ๋Œ€ ์ ์šฉ)

๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์œ„ํ•œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ํŒŒํ˜•์€ ๊ทธ๋ฆผ. 2์™€ ๊ฐ™์ด ํŽ„์Šค ํญ 1ns๋ฅผ ๊ฐ–๋Š” ๊ฐ€์šฐ์‹œ์–ธํ˜• ํŽ„์Šค๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค. ์ผ๋ฐ˜์ ์œผ๋กœ ๊ฒฐํ•จ ์ž์ฒด์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ํŒŒํ˜•์€ ๋งค์šฐ ๋น ๋ฅธ ํŒŒํ˜•์œผ๋กœ ์ฃผ์œ„ ๋งค์งˆ์— ๋”ฐ๋ผ 0.1โˆผ10 ns ์ •๋„(6,7)์ด๋ฏ€๋กœ ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ƒ๊ธฐ ๊ฐ’์„ ์ ์šฉํ•˜์˜€๋‹ค. ์ฃผ์ž…ํ•œ ํŽ„์Šค์˜ ํฌ๊ธฐ๋Š” 0.9 [V]๋กœ ์ ์šฉํ•˜์˜€๋‹ค.

๊ทธ๋ฆผ. 2. ๋ชจ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ์ฃผ์ž…ํŽ„์Šค ํ˜•ํƒœ

Fig. 2. Artificial partial discharge(PD) pulse waveform

../../Resources/kiee/KIEE.2018.67.1.75/fig2.png

๊ทธ๋ฆผ. 3์€ ํ‘œ 1์˜ ๋ชจ๋ธ์ผ€์ด๋ธ”์— ๋Œ€ํ•ด ๊ทธ๋ฆผ. 2์™€ ๊ฐ™์€ ํŽ„์Šค๊ฐ€ ์ผ€์ด๋ธ”์˜ 0m ์œ„์น˜์— ์ฃผ์ž…๋˜์—ˆ์„ ๋•Œ ๊ฐ๊ฐ 1, 2, 3, 4m ์œ„์น˜์—์„œ ๋‚˜ํƒ€๋‚œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ๋กœ์„œ, ๋ฐ˜๋„์ „์ธต์˜ ์กด์žฌ๋กœ ์ธํ•ด ํฌ๊ธฐ๊ฐ€ ํฌ๊ฒŒ ๊ฐ์‡„ํ•˜๋Š” ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ์œผ๋ฉฐ ์ด ๋•Œ ๊ณ„์‚ฐ๋œ ํŽ„์Šค ์ „ํŒŒ์†๋„๋Š” ์•ฝ 165m/ใŽฒ๋กœ ๊ณ„์‚ฐ๋˜์—ˆ๋‹ค. ์ด๋Ÿฌํ•œ ๊ฒฐ๊ณผ๋Š” ์ผ๋ฐ˜์ ์ธ XLPE ์ผ€์ด๋ธ”์—์„œ ํŽ„์Šค ์ „ํŒŒ์†๋„(10)์— ํ•ด๋‹นํ•˜๋Š” ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚˜ ๋ณธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์ด ํƒ€๋‹นํ•จ์„ ํ™•์ธํ•˜์˜€๋‹ค.

๊ทธ๋ฆผ. 3. ์ œ๋ชฉ

Fig. 3. ์ œ๋ชฉ

../../Resources/kiee/KIEE.2018.67.1.75/fig3.png

3. XLPE ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ EBA(๊ธฐ์ค‘์ข…๋‹จ ์ ‘์†ํ•จ)์—์„œ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜

3.1 EBA ๋ชจ๋ธ๋ง

์†ก์ „ XLPE ์ผ€์ด๋ธ” EBA์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์œ„ํ•œ ๋ชจ๋ธ๊ณผ ์ ์šฉํ•œ ๋ฌผ์„ฑ์น˜๋ฅผ ๊ฐ๊ฐ ๊ทธ๋ฆผ. 4 ๋ฐ ํ‘œ 2์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. XLPE ์ผ€์ด๋ธ” ๋„์ฒด์˜ ๋‹จ๋ฉด์ ์€ 1200mm2๋กœ ํ•˜์˜€์œผ๋ฉฐ, ๊ทธ๋ฆผ. 4์™€ ๊ฐ™์ด XLPE ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ์—์„œ ๊ฐ€์žฅ ๊ณ ์žฅ์ด ๋งŽ์ด ๋ฐœ์ƒํ•˜๋Š” ์ ‘์†ํ•จ์˜ ์ŠคํŠธ๋ ˆ์Šค์ฝ˜(SRC) 3์ค‘์  ๋ถ€๋ถ„์— ๋ชจ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๋ฅผ ์ฃผ์ž…ํ•˜์˜€๋‹ค. ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๋Š” ๋ฐœ์ƒ ํ›„ ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ์˜ ์–‘์ชฝ ๋ฐฉํ–ฅ์œผ๋กœ ์ „ํŒŒํ•˜๊ฒŒ ๋˜๋ฏ€๋กœ +z์ถ• ๋ฐฉํ–ฅ ๋ฐ โ€“z์ถ• ๋ฐฉํ–ฅ์— ๋Œ€ํ•ด ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํ•œ ๋’ค 2๊ฐ€์ง€ ๊ฒฝ์šฐ๋ฅผ ํ•ฉ์„ฑํ•˜์˜€๋‹ค. EBA์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜•์„ ํ™•์ธํ•˜๊ณ  ์„ผ์„œ ์„ค์น˜ ์œ„์น˜์— ๋Œ€ํ•œ ์ ์ ˆ์„ฑ ํŒŒ์•…์„ ์œ„ํ•˜์—ฌ, ํ˜„์žฅ ์ธก์ •์—์„œ ์ „์žํŒŒ ์„ผ์„œ์˜ ๊ฒฝ์šฐ EBA ํ•˜๋‹จ ๋™๋ฐ•์Šค์— ๋ถ€์ฐฉํ•˜์—ฌ ์ธก์ •ํ•˜๊ณ  HFCT(High Frequency Current Transformer)์˜ ๊ฒฝ์šฐ์—๋Š” ์ ‘์ง€์„ ์— ์žฅ์ฐฉํ•˜๋ฏ€๋กœ ์ด๋ฅผ ๊ฐ์•ˆํ•˜์—ฌ ๊ทธ๋ฆผ. 4(b)์™€ ๊ฐ™์ด ์„ผ์„œ ์œ„์น˜์— ๋Œ€ํ•ด ๋™๋ฐ•์Šค์— 3๊ณณ ๋ฐ ์ ‘์ง€์„ ์— 4๊ณณ์„ ๊ณ ๋ คํ•˜์—ฌ ๋น„๊ตํ•˜์˜€๋‹ค.

๊ทธ๋ฆผ. 4. EBA ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋ชจ๋ธ ๋ฐ ํŒŒํ˜• ์ธก์ • ์„ผ์„œ ์œ„์น˜

Fig. 4. Simulation model of PD pulse waveform for EBA and positions of installed sensors

../../Resources/kiee/KIEE.2018.67.1.75/fig4.png

ํ‘œ 2. EBA ๋ฐ PMJ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์˜ ์ ์šฉ ๋ฌผ์„ฑ์น˜

Table 2. Values of PD pulse propagation simulation for EBA and PMJ

Standard* Sunny Subjects

(N = 5)

Cloudy Subjects

(N = 5)

Subjects

Age

Twenty

26.0

ยฑ2.55

25.4

ยฑ3.05

25.56

ยฑ2.79

Height

175.8

ยฑ5.38

173.6

ยฑ2.30

173.6

ยฑ5.86

174.0

ยฑ4.24

Weight

75.6

ยฑ10.78

67.4

ยฑ5.55

69.2

ยฑ6.10

69.0

ยฑ5.43

BMI

18.5

~22.9

17.54

ยฑ2.42

20.04

ยฑ4.31

19.04

ยฑ3.66

Pulse

50

~100

68.0

ยฑ7.35

73.4

ยฑ8.32

69.67

ยฑ7.66

Blood

pressure

120/80

119.4

/75.0

(ยฑ7.23

/8.06)

126.2

/73.4

(ยฑ10.06

/7.67)

123

/74.22

(ยฑ9.53

/7.92)

* PEC : Perfect Electric Conductor

3.2 EBA์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ ๋ฐ ๋ถ„์„

๊ทธ๋ฆผ. 5๋Š” โ€˜Box 2โ€™ ์œ„์น˜์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „์„ ์ธก์ •ํ•  ๊ฒฝ์šฐ ๋‚˜ํƒ€๋‚œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜•์ด๋‹ค. ๋ชจ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๊ฐ€ ์ฃผ์ž…๋œ์ง€ ์•ฝ 7ns ํ›„์— -z ๋ฐฉํ–ฅ์œผ๋กœ ๋จผ์ € ์ „ํŒŒ๋œ ํŒŒํ˜•์ด ์ธก์ •๋˜๊ณ , ์ด์–ด์„œ +z ๋ฐฉํ–ฅ์œผ๋กœ ์ „ํŒŒํ•œ ํŽ„์Šค๊ฐ€ ์ ‘์†ํ•จ๋‚ด๋ถ€ ๊ตฌ์„ฑ์š”์†Œ๋“ค์˜ ์ž„ํ”ผ๋˜์Šค ์ฐจ์ด์— ์˜ํ•œ ๋ฐ˜์‚ฌํŒŒ๊ฐ€ ๋ฐœ์ƒํ•˜์—ฌ ์ฒซ ํ”ผํฌ ์ดํ›„ ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ํ”ผํฌ๊ฐ€ ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ์œผ๋ฉฐ ๊ทธ ์ดํ›„ ํŒŒํ˜•์€ ์ƒ๋‹นํžˆ ๊ฐ์‡„๋˜๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์ด๋Ÿฌํ•œ ํŠน์„ฑ์€ ์ ‘์†ํ•จ ๊ตฌ์กฐ๋กœ ์ธํ•ด ๋‚˜ํƒ€๋‚˜๋Š” ๊ฒƒ์œผ๋กœ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค ํŒŒํ˜•์˜ ํ•ด์„์— ๋งค์šฐ ์ค‘์š”ํ•œ ๋ถ€๋ถ„์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ํ•œํŽธ ์ ‘์†ํ•จ ์ŠคํŠธ๋ ˆ์Šค์ฝ˜์˜ 3์ค‘์ ์— ์ฃผ์ž…ํ•œ ๋ชจ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๋Š” ์•ฝ 7ns ์ •๋„ ํ›„์— ์„ผ์„œ์— ๋„์ฐฉํ•˜๊ณ  ์žˆ์œผ๋ฏ€๋กœ 1m ์ •๋„ ๋–จ์–ด์ง„ ๊ฑฐ๋ฆฌ๋ฅผ ๊ณ ๋ คํ•˜๋ฉด ์•ฝ 140m/ใŽฒ๋กœ ๊ณ„์‚ฐ๋œ๋‹ค. ์ด๋Š” ์ผ€์ด๋ธ”์—์„œ์˜ ์ „ํŒŒ์†๋„์ธ 165m/ใŽฒ ๋ณด๋‹ค ๋Šฆ์€ ์†๋„๋กœ์„œ ์ ‘์†ํ•จ์˜ ์ž„ํ”ผ๋˜์Šค๊ฐ€ ์ผ€์ด๋ธ”๊ณผ๋Š” ๋‹ค๋ฅด๊ธฐ ๋•Œ๋ฌธ์ธ ๊ฒƒ์œผ๋กœ ํ•ด์„๋œ๋‹ค.

๊ทธ๋ฆผ. 5. EBA ๋™๋ฐ•์Šค ํ•˜๋‹จ Box 2 ์œ„์น˜์—์„œ์˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋ชจ๋ธ ๊ฒฐ๊ณผ

Fig. 5. Simulation result at the position of Box 2 in the EBA copper box

../../Resources/kiee/KIEE.2018.67.1.75/fig5.png

๊ทธ๋ฆผ. 6์€ ํ˜„์žฅ์—์„œ EBA ๋ถ€๋ถ„๋ฐฉ์ „ ์‹ ํ˜ธ๋กœ ์ถ”์ •๋˜๋Š” ํŒŒํ˜•๊ณผ ์ค€๊ณต ์‹œํ—˜์‹œ ๋ชจ์˜ ํŽ„์Šค๋ฅผ ์ฃผ์ž…ํ•œ ๊ฒฝ์šฐ์˜ ํŒŒํ˜•์ด๋‹ค. ๋ชจ๋“  ๊ฒฝ์šฐ ์ฒซ ๋ฒˆ์งธ ํ”ผํฌ์— ์ด์–ด์„œ ๋ฐ˜๋Œ€ ๊ทน์„ฑ์˜ ๋‘ ๋ฒˆ์งธ ํ”ผํฌ๊ฐ€ ๋ฐœ์ƒํ•˜๊ณ  ์žˆ๋‹ค. EBA์˜ ํฌ๊ธฐ, ๊ตฌ์„ฑํ’ˆ์˜ ์žฌ์งˆ, ํŽ„์Šค ๋ฐœ์ƒ ์œ„์น˜ ๋“ฑ์— ๋”ฐ๋ผ ํŒŒํ˜•์ด ๋‹ค๋ฅด๊ฒŒ ๋‚˜ํƒ€๋‚  ๊ฒƒ์œผ๋กœ ๋ถ„์„๋˜์ง€๋งŒ, ๊ธฐ๋ณธ์ ์œผ๋กœ ์ฒซ ๋ฒˆ ํ”ผํฌ์— ์ด์–ด ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ๋ฐ˜์‚ฌํŒŒ ํ”ผํฌ๊ฐ€ ๋’ค๋”ฐ๋ฅด๋Š” ํ˜•ํƒœ๊ฐ€ ๋…ํŠนํ•œ ํŠน์„ฑ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ํ˜„์žฅ ์ธก์ •์˜ ๊ฒฝ์šฐ์— ๋น„ํ•ด ๊ทธ๋ฆผ. 5์˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜•์€ ์ƒ๋‹นํžˆ ๋†’์€ ์ฃผํŒŒ์ˆ˜ ์„ฑ๋ถ„์„ ๋ณด์ด๋Š” ์ฐจ์ด๊ฐ€ ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ๋Š”๋ฐ, ์ด๊ฒƒ์€ 1ns ๊ฐ€์šฐ์‹œ์–ธํ˜• ํŽ„์Šค๋ฅผ ์ฃผ์ž…ํ•˜์—ฌ ๊ณ ์ฃผํŒŒ ์„ฑ๋ถ„์ด ๊ทธ๋Œ€๋กœ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋˜์—ˆ๊ณ , ํ˜„์žฅ์—์„œ๋Š” ์ผ€์ด๋ธ” ๊ตฌ์กฐ ๋ฐ ์žฌ์งˆ์˜ ์ฐจ์ด์™€ ์„ค์น˜ํ˜•ํƒœ์˜ ๋‹ค์–‘์„ฑ, ์‹œ์Šค์™ธ๋ถ€์—์„œ์˜ TEV(Transient Earthing Voltage) ๋ฐœ์ƒ๊ณผ ์ „ํŒŒ ๋ฐ ์„ผ์„œ์˜ ์ธก์ •์›๋ฆฌ ๋ฐ ์ฃผํŒŒ์ˆ˜ ํŠน์„ฑ ๋“ฑ์œผ๋กœ ์ธํ•ด ์ธก์ •ํŒŒํ˜•์ด ๋‹ฌ๋ผ์ง€๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ํ•ด์„๋œ๋‹ค. ์ด๋Ÿฌํ•œ ๋ถ€๋ถ„์„ ๊ฐ์•ˆํ•˜๋ฉด ๋ณธ ์—ฐ๊ตฌ์˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์€ ํ˜„์žฅ ์ธก์ •๊ณผ ์ƒ๋‹นํ•œ ์œ ์‚ฌ์„ฑ์„ ๊ฐ€์ ธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์ด ํšจ๊ณผ์ ์ธ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

๊ทธ๋ฆผ. 6. EBA ๋ถ€๋ถ„๋ฐฉ์ „ ์ถ”์ • ํŽ„์ŠคํŒŒํ˜• ์ธก์ • ์‚ฌ๋ก€

Fig. 6. Examples of on-site measured PD pulse wave- form in EBA

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๊ทธ๋ฆผ. 7์€ ๋™๋ฐ•์Šค์—์„œ ์„ค์น˜์œ„์น˜์— ๋”ฐ๋ฅธ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ์ด๋‹ค. Box 3 ์œ„์น˜ ์ชฝ ์ฆ‰, ๋™๋ฐ•์Šค ํ•˜๋‹จ ์ชฝ์œผ๋กœ ๊ฐˆ์ˆ˜๋ก ๋ฐ˜์‚ฌํŒŒ๋กœ ์ธํ•˜์—ฌ ์ „์ฒด์ ์ธ ํŽ„์Šค ํŒŒํ˜•์ด ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ๊ทธ๋ฆผ. 7(b)์˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŽ„์Šค ํŒŒํ˜•์˜ ์ •๊ทน์„ฑ๊ณผ ๋ถ€๊ทน์„ฑ ํ”ผํฌ์˜ ํฌ๊ธฐ๋ฅผ ๋น„๊ตํ•œ ๊ฒƒ์„ ๋ณด๋ฉด ๋™๋ฐ•์Šค ํ•˜๋‹จ ์ชฝ์œผ๋กœ ์„ผ์„œ๋ฅผ ์„ค์น˜ํ•˜๋Š” ๊ฒƒ์ด ๊ฐ€์žฅ ํšจ๊ณผ์ ์ธ ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

๊ทธ๋ฆผ. 7. EBA ๋ชจ๋ธ ๋™๋ฐ•์Šค ์œ„์น˜๋ณ„ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜•

Fig. 7. Simulated waveform according to the different sensor position at the copper box of EBA model

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ํ•œํŽธ ๊ทธ๋ฆผ. 8์€ ๋™๋ฐ•์Šค์— ์—ฐ๊ฒฐ๋œ ์ ‘์ง€์„ ์— ๋‚˜ํƒ€๋‚˜๋Š” ๋ชจ์˜ ์ฃผ์ž…ํŽ„์Šค์˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ๋ฅผ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์ด๋‹ค. ๋™๋ฐ•์Šค์—์„œ์˜ ์ธก์ •๊ณผ ์œ ์‚ฌํ•œ ์–‘์ƒ์œผ๋กœ ๋‚˜ํƒ€๋‚˜์ง€๋งŒ ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ๋‘ ๋ฒˆ์งธ ํ”ผํฌ๊ฐ€ ๋™๋ฐ•์Šค์˜ ๊ฒฝ์šฐ์— ๋น„ํ•ด ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜, ์ผ๋ฐ˜์ ์œผ๋กœ ์ ‘์ง€์„ ์—๋Š” HFCT ์„ผ์„œ๋ฅผ ์ ์šฉํ•˜๋ฉฐ ๋Œ€๋ถ€๋ถ„ ์ธก์ • ์ฃผํŒŒ์ˆ˜ ์ƒํ•œ์ด 100MHz ์ด๋‚ด์ด๋ฏ€๋กœ ๊ณ ์ฃผํŒŒ์˜ ์ธก์ •์€ ์ด๋ฃจ์–ด์ง€์ง€ ์•Š์•„ ๋ณธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ์™€๋Š” ๋‹ค์†Œ ๋‹ค๋ฅธ ํŒŒํ˜•์œผ๋กœ ์ถ”์ •๋˜๋ฉฐ ํŠนํžˆ ์„ผ์„œ ์œ„์น˜์— ๋”ฐ๋ฅธ ํŒŒํ˜• ์ฐจ์ด๋Š” ๋ช…ํ™•ํ•˜์ง€ ์•Š์„ ๊ฒƒ์œผ๋กœ ์‚ฌ๋ฃŒ๋œ๋‹ค.

๊ทธ๋ฆผ. 8. EBA ์ ‘์ง€์„  ์œ„์น˜๋ณ„ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜•

Fig. 8. Simulated waveform according to the different sensor position at the ground wire of EBA model

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4. XLPE ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ PMJ(์ค‘๊ฐ„์ ‘์†ํ•จ)์—์„œ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜

4.1 PMJ ๋ชจ๋ธ๋ง

์†ก์ „ XLPE ์ผ€์ด๋ธ” PMJ(Pre-Moulded Joint)์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์œ„ํ•œ ๋ชจ๋ธ๋ง์„ ์‹ค์‹œํ•˜์˜€๋‹ค. ์ „์ˆ ํ•œ EBA์™€ ์œ ์‚ฌํ•˜๊ฒŒ XLPE ์ผ€์ด๋ธ”์˜ ๋„์ฒด๋Š” 1200mm2 ๋กœ ํ•˜์—ฌ ๊ทธ๋ฆผ. 9์™€ ๊ฐ™์ด PMJ๋ฅผ ๋ชจ๋ธ๋งํ•˜์˜€๊ณ  ์—ฌ๊ธฐ์— ์ ์šฉํ•œ ๊ฐ ๋ถ€๋ถ„์˜ ๋ฌผ์„ฑ์น˜๋Š” ํ‘œ 2์™€ ๊ฐ™๋‹ค. ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์Šค๋„ ๊ฐ€์žฅ ๊ณ ์žฅ์ด ๋งŽ์ด ๋ฐœ์ƒํ•˜๋Š” ๋ฐ˜๋„์ „ ๋””ํ”Œ๋ ‰ํ„ฐ ๋ถ€๋ถ„์— ์ฃผ์ž…ํ•˜์˜€์œผ๋ฉฐ, ํŽ„์Šค๋Š” +z์ถ• ๋ฐฉํ–ฅ ๋ฐ โ€“z์ถ• ๋ฐฉํ–ฅ์˜ ์–‘์ชฝ์œผ๋กœ ์ „ํŒŒํ•˜๋„๋ก ํ•˜์—ฌ ๊ฐ๊ฐ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํ•œ ๋’ค 2๊ฐ€์ง€ ๊ฒฝ์šฐ๋ฅผ ํ•ฉ์„ฑํ•˜์˜€๋‹ค. ํ•œํŽธ, ๊ทธ๋ฆผ. 9์— ๋‚˜ํƒ€๋‚ธ ๋ฐ”์™€ ๊ฐ™์ด PMJ ๋™๋ฐ•์Šค ํ‘œ๋ฉด์˜ 4๊ณณ์— ์„ผ์„œ ์„ค์น˜์œ„์น˜๋ฅผ ์„ ์ •ํ•˜์—ฌ ์ ‘์†ํ•จ ๊ฐ๊ฐ์˜ ์ธก์ •์œ„์น˜์— ๋”ฐ๋ผ ํŽ„์Šค ํŒŒํ˜•์ด ์–ด๋–ป๊ฒŒ ๋‹ฌ๋ผ์ง€๋Š”์ง€ ํ™•์ธํ•˜์˜€๋‹ค.

๊ทธ๋ฆผ. 9. ์ค‘๊ฐ„์ ‘์†ํ•จ(PMJ) ๋ชจ๋ธ์˜ ๊ตฌ์„ฑ ๋ฐ ์„ผ์„œ ์œ„์น˜

Fig. 9. Simulation model of PD pulse waveform for PMJ and positions of installed sensors

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4.2 PMJ์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์ „ํŒŒ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ ๋ฐ ๋ถ„์„

๊ทธ๋ฆผ. 10์€ PMJ์˜ ๊ฐ ์œ„์น˜์—์„œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ๋กœ ๋‚˜ํƒ€๋‚œ ํŽ„์Šค ํŒŒํ˜•์ด๋‹ค. PMJ์˜ ์ ‘์†๋ถ€๊ฐ€ ์žˆ๋Š” ์ชฝ ๋ณด๋‹ค๋Š” ์‹œ๊ณต์‹œ ์ž‘์—… ๊ณต๊ฐ„์œผ๋กœ ๋น„์–ด์žˆ๋Š” ์ชฝ์˜ ๋ ๋ถ€๋ถ„์ด ์•„์ฃผ ํฐ ํŽ„์Šค๊ฐ€ ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ๋‹ค. ์•„์šธ๋Ÿฌ ํŽ„์Šค์˜ ๋‘ ๋ฒˆ์งธ ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ํ”ผํฌ๊ฐ€ ์ฒซ ๋ฒˆ์งธ ํ”ผํฌ์˜ ํฌ๊ธฐ์— ์ƒ๋‹นํ•˜๋Š” ์ˆ˜์ค€์œผ๋กœ ๋‚˜ํƒ€๋‚˜, EBA์™€๋Š” ๋‹ค์†Œ ๋‹ค๋ฅธ ์–‘์ƒ์„ ๋ณด์ด๊ณ  ์žˆ๋‹ค. ์•„์šธ๋Ÿฌ ๊ทธ๋ฆผ. 11์€ PMJ์˜ ๊ฐ ์œ„์น˜์—์„œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜• ํฌ๊ธฐ ๋น„๊ต๋ฅผ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์œผ๋กœ ์ ‘์†ํ•จ ๋น„์–ด์žˆ๋Š” ์ชฝ ๋ ๋ถ€๋ถ„์ธ Case 4์˜ ์‹ ํ˜ธ๊ฐ€ ๋งค์šฐ ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚˜ ์„ผ์„œ ์„ค์น˜์˜ ์ตœ์ ์˜ ์œ„์น˜์ธ ๊ฒƒ์„ ๋ณด์ด๊ณ  ์žˆ๋‹ค.

๊ทธ๋ฆผ. 10. PMJ์˜ ๊ฐ ์œ„์น˜์—์„œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ ํŒŒํ˜•

Fig. 10. Simulated waveform according to the different sensor position at the PMJ model

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๊ทธ๋ฆผ. 11. PMJ์˜ ๊ฐ ์œ„์น˜์—์„œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ํŒŒํ˜• ํฌ๊ธฐ ๋น„๊ต

Fig. 11. Magnitudes of waveform according to the different position of installed sensors in PMJ

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๊ทธ๋ฆผ. 12๋Š” ํ˜„์žฅ์—์„œ PMJ ๋ถ€๋ถ„๋ฐฉ์ „ ์‹ ํ˜ธ๋กœ ์ถ”์ •๋˜๋Š” ํŒŒํ˜•์„ ์ „์žํŒŒ์„ผ์„œ๋ฅผ ์ด์šฉํ•˜์—ฌ ์ธก์ •ํ•œ ์‚ฌ๋ก€์ด๋‹ค. ์ ‘์†ํ•จ ๋ ๋ถ€๋ถ„์˜ ์‹ ํ˜ธ๊ฐ€ ๋‹ค๋ฅธ ๋ถ€๋ถ„์— ๋น„ํ•ด ํฌ๊ฒŒ ๋‚˜ํƒ€๋‚˜๊ณ  ์ •๋ถ€๊ทน์„ฑ์˜ ํ”ผํฌ์˜ ํฌ๊ธฐ๊ฐ€ ์œ ์‚ฌํ•œ ์ ์ด ๋ณธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ์™€ ์œ ์‚ฌํ•˜๋‹ค. ๋‹ค๋งŒ, ์‹ค์ œ ์ธก์ •์—์„œ๋Š” ์ง„๋™๋˜๋Š” ํ”ผํฌ๋“ค์ด ๋งŽ์ด ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ๋Š”๋ฐ, ์ด๊ฒƒ์€ ์‹ค์ œ ๊ตฌ์กฐ๊ฐ€ ๋ชจ๋ธ๋งํ•œ ๊ฒƒ๋ณด๋‹ค๋Š” ๋ณต์žกํ•˜๊ณ  ๋™๋ฐ•์Šค ์™ธ๋ถ€์—์„œ ์ธก์ •ํ•  ๊ฒฝ์šฐ TEV(Transient Earthing Voltage)๊ฐ€ ๋‹ค์–‘ํ•˜๊ณ  ๋ณต์žกํ•˜๊ฒŒ ์ค‘์ฒฉ์ด ์ผ์–ด๋‚˜๊ธฐ ๋•Œ๋ฌธ์œผ๋กœ ์‚ฌ๋ฃŒ๋œ๋‹ค. ๋˜ํ•œ ํ˜„์žฅ ์ธก์ •์˜ ๊ฒฝ์šฐ์—๋Š” ์‹œ๊ฐ„ ์ถ•์œผ๋กœ ๊ธด ํŒŒํ˜•์ด ๋‚˜ํƒ€๋‚˜๊ณ  ์žˆ๋Š”๋ฐ, ๊ทธ๋ฆผ. 10์˜ ๊ฒฝ์šฐ ๋งค์šฐ ์งง์€ ํŽ„์Šค๋กœ๋งŒ ๋‚˜ํƒ€๋‚˜๋Š” ๊ฒƒ์€ ์ฃผ์ž…ํŒŒํ˜•์˜ ์ฐจ์ด, ์ผ€์ด๋ธ” ๊ตฌ์กฐ์™€ ์žฌ์งˆ ๋ฐ ํ˜„์žฅ ์„ค์น˜์กฐ๊ฑด์˜ ์ฐจ์ด, ์ผ€์ด๋ธ” ์‹œ์Šค ์™ธ๋ถ€ ์ธก์ •๊ณผ ์ ์šฉ ์„ผ์„œ์˜ ํŠน์„ฑ ๋“ฑ์— ๊ธฐ์ธํ•œ ์ฐจ์ด ๋•Œ๋ฌธ์ธ ๊ฒƒ์œผ๋กœ ๋ถ„์„๋œ๋‹ค.

๊ทธ๋ฆผ. 12. ํ˜„์žฅ PMJ ๋ถ€๋ถ„๋ฐฉ์ „ ์ถ”์ •์‹ ํ˜ธ ์ธก์ • ์‚ฌ๋ก€

Fig. 12. Examples of on-site measured PD pulse wave- form in PMJ

../../Resources/kiee/KIEE.2018.67.1.75/fig12.png

5. ๊ฒฐ ๋ก 

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ง€์ค‘์†ก์ „ XLPE ์ผ€์ด๋ธ” ์‹œ์Šคํ…œ์˜ EBA ๋ฐ PMJ์—์„œ ๋ถ€๋ถ„๋ฐฉ์ „ ํ˜„์ƒ์— ๋Œ€ํ•œ ์ดํ•ด์™€ ์ธก์ •์˜ ์ •ํ™•์„ฑ์„ ํ–ฅ์ƒ์‹œํ‚ค๊ธฐ ์œ„ํ•ด ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ์ˆ˜ํ–‰ํ•˜์—ฌ ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๊ฒฐ๋ก ์„ ์–ป์—ˆ๋‹ค.

๋ณธ ์—ฐ๊ตฌ์—์„œ ์ ์šฉํ•œ FDTD ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ธฐ๋ฒ•์€ ํŽ„์Šค์˜ ์ „ํŒŒํŠน์„ฑ ๋ฐ ํŒŒํ˜• ํ˜•์„ฑ ์ธก๋ฉด์—์„œ ์‹ค์ œ ์ธก์ •๊ฒฐ๊ณผ์™€ ๋น„๊ตํ•  ๋•Œ ์ „๋ ฅ์ผ€์ด๋ธ”์— ๋Œ€ํ•œ ๋ถ€๋ถ„๋ฐฉ์ „ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์— ์ ์ ˆํ•œ ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. EBA์— ๋Œ€ํ•œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ๋Š” ์ฒซ ๋ฒˆ์งธ ํ”ผํฌ ์ดํ›„ ํฌ์ง€ ์•Š์€ ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ๋‘ ๋ฒˆ์งธ ํ”ผํฌ๊ฐ€ ๋‚˜ํƒ€๋‚˜๋Š” ์–‘์ƒ์„ ๋ณด์˜€์œผ๋ฉฐ EBA ๋™๋ฐ•์Šค ํ•˜๋‹จ ์ชฝ์ด ์ธก์ •๊ฐ๋„๊ฐ€ ๊ฐ€์žฅ ๋†’์€ ๊ฒƒ์œผ๋กœ ๋ถ„์„๋˜์—ˆ๋‹ค. PMJ์— ๋Œ€ํ•œ ํ•ด์„ ๊ฒฐ๊ณผ์—์„œ๋Š” ๋ฐ˜๋Œ€๊ทน์„ฑ์˜ ๋‘ ๋ฒˆ์งธ ํ”ผํฌ์˜ ํฌ๊ธฐ๊ฐ€ ์ฒซ ๋ฒˆ์งธ ํ”ผํฌ์— ์ƒ๋‹นํ•˜๋Š” ์ •๋„๋กœ ํฌ๊ธฐ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ PMJ ๋™๋ฐ•์Šค ๋ ์ชฝ์˜ ์ธก์ •๊ฐ๋„๊ฐ€ ๊ฐ€์žฅ ๋†’์€ ๊ฒƒ์œผ๋กœ ๋ถ„์„๋˜์—ˆ๋‹ค.

์ด์ƒ์˜ ๊ฒฐ๊ณผ๋Š” ํ˜„์žฅ ์ธก์ •๊ฒฐ๊ณผ์™€ ์ƒ๋‹นํ•œ ์œ ์‚ฌ์„ฑ์„ ๋ณด์—ฌ ๋ณธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์ด ๋งค์šฐ ์ ์ ˆํ•˜์˜€๋‹ค๊ณ  ํŒ๋‹จ๋˜๋ฉฐ, ํ˜„์žฅ ๋ถ€๋ถ„๋ฐฉ์ „ ์ธก์ •์— ๋งค์šฐ ์œ ์šฉํ•  ๊ฒƒ์œผ๋กœ ์‚ฌ๋ฃŒ๋œ๋‹ค. ํ–ฅํ›„ ๋ณด๋‹ค ์‹ค์ œ์ ์ธ ๊ตฌ์กฐ ๋ฐ ํƒ€ ์„ค๋น„๊ฐ€ ์„ค์น˜๋œ ์ƒํƒœ์—์„œ์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํŽ„์ŠคํŒŒํ˜• ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ํ†ตํ•ด ์ „๋ ฅ ์ผ€์ด๋ธ”์˜ ๋ถ€๋ถ„๋ฐฉ์ „ ํ˜„์ƒ ํ•ด์„์— ๊ธฐ์—ฌํ•˜๊ณ ์ž ํ•œ๋‹ค.

๊ฐ์‚ฌ์˜ ๊ธ€

์ด ๋…ผ๋ฌธ์€ 2017ํ•™๋…„๋„ ๋Œ€์ง„๋Œ€ํ•™๊ต ํ•™์ˆ ์—ฐ๊ตฌ๋น„ ์ง€์›์— ์˜ํ•œ ๊ฒƒ์ž„.

References

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Cavallini A. et al, 2003, Advanced PD Interference in On field Measurements. Part 1:Noise Rejection, IEEE Trans on DEI, Vol. 10, No. 2, pp. 216-224Google Search
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Kim Jeong-Tae, Kim Ji-Hong, Chang Yong-Moo, Koo Ja-Yoon, 2008, Pulse Analysis Algorithms for Distinguishing Discharge Sources using Different Types of Sensors, IEEJ Trans. FM, Vol. 128, No. 5, pp. 350-356DOI
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Heinrich R., Schaper S., Kalkner W., Plath R., Bethge A., 2003, Synchronous Three Phase Partial Discharge Detection on Rotating Machines, ISH 2003, Paper 542, Delft, NetherlandsGoogle Search
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Rethmeier K., Balkon C., Obralic A., Kalkner W., Plath R., 2007, PD Localization by Time Domain Reflectometry with PD Decoupling at Joints of High Voltage Cable Systems - Advantages and Limits, 13th International Symposium on High Voltage Engineering, T7-533Google Search
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LEE J. S., KIM J. T., KOO J. Y., 2003, The analysis of the partial discharge pattern to the artificial defects introduced at the interface in an XLPE cable joint using laboratory model, Jicable 03, pp. 682-688Google Search
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Ohtsuka S., Fukuda K., Sogabe A., 2011, Measurement of PD Current Waveforms in SF6 Gas with a Super High Frequency Wide Band Measurement System, 17th International Symposium on High Voltage Engineering, D-074, Hannover, GermanyGoogle Search
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Morshuis P., Smit J., 2005, Partial Discharges at dc Voltage: Their Mechanism, Detection and Analysis, IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 12, pp. 328-340DOI
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Itose A., Tai Y., Kozako M., Hikita M., 2015, Partial Discharge Detection by TEV Sensors and Signal Propagation Analysis in Transformer Model, 19th International Symposium on High Voltage Engineering, Paper 567, Pilsen, Czech RepublicGoogle Search
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, https://en.wikipedia.org/wiki/Finite-difference_time- domain_method
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Wen Shu E., Boggs S., 2008, Dispersion and PD Detection in Shielded Power Cable, IEEE Electrical Insulation Magazine, Vol. 24, No. 1, pp. 25-29DOI

์ €์ž์†Œ๊ฐœ

๊น€์ •ํƒœ (Jeong-Tae Kim)
../../Resources/kiee/KIEE.2018.67.1.75/au1.png

1982๋…„ ํ•œ์–‘๋Œ€ ๊ณต๋Œ€ ์ „๊ธฐ๊ณตํ•™๊ณผ ์กธ์—…(ํ•™์‚ฌ)

1987๋…„ ํ•œ์–‘๋Œ€ ๊ณต๋Œ€ ์ „๊ธฐ๊ณตํ•™๊ณผ ์กธ์—…(์„์‚ฌ)

1992๋…„ ํ•œ์–‘๋Œ€ ๊ณต๋Œ€ ์ „๊ธฐ๊ณตํ•™๊ณผ ์กธ์—…(๊ณต๋ฐ•)

ํ˜„์žฌ ๋Œ€์ง„๋Œ€ ๊ณต๋Œ€ ์ „๊ธฐ๊ณตํ•™๊ณผ ๊ต์ˆ˜

2007๋…„~2008๋…„:๋ฏธ๊ตญ Mississippi State University ๊ตํ™˜๊ต์ˆ˜

2000๋…„~2008๋…„ CIGRE SC-B1 Insulated Cables, Regular Member

๊ด€์‹ฌ๋ถ„์•ผ : ๊ณ ์ „์•• ์ ˆ์—ฐ์„ค๊ณ„, ์ ˆ์—ฐ ์ˆ˜๋ช…, ์ „๋ ฅ์„ค๋น„ ์ ˆ์—ฐ์ง„๋‹จ ๋“ฑ

E-mail : jtkim@daejin.ac.kr