Analysis on the Dielectric Characteristics of
Solid
Insulation Materials in LN2 for Development
of High Voltage Magnet Applications
Abstract
Several types of solid materials are used in the developmentof high
voltage superconducting magnet systems as the former and insulation barrier. The solid insulation materialsused in
cryogenic applications require excellent dielectric characteristicsas well as
robust mechanical characteristics. In thisstudy, the dielectric experiments for
three types of solid insulation materials, including glass fiber reinforced
plastic (GFRP), epoxy(Stycast 2850FTJ), and Bakelite in liquid nitrogen (LN2)
at 77 Ktemperature are performed. Each experiment on the solid insulation materials
is performed according to the type of applied voltage (lightning impulse and ac
voltage) and the system pressure (0.1 ∼ 0.4 MPa).
Also, experiments considering the stacking effect of insulation sheets are
performed. All electrical breakdown voltages are observed when the solid
insulation materials are fully penetrated. Electrical breakdown experiments on
GFRP and Bakelite sheets according to the number of stacking are performed and
the results are compared. The relationship between the dielectric
characteristics of solid insulation materials and the distribution of electric
field intensity is calculated and analyzed by the finite elements method (FEM).
The results revealed that the dielectric characteristics of solid insulation
materials in LN2 are directly affected by the distribution of electric field
intensity and thenumber of stacking sheets.
Index Terms—Bakelite, dielectrihttp://images.zwani.com/graphics/animated/images/animated119.gifc characteristics, GFRP, solid
insulator, stacking, Stycast.
Analisis Karakteristik Dielektrik Solid Bahan Isolasi di LN2 untuk Pengembangan
Aplikasi Magnet Tegangan Tinggi
Beberapa jenis bahan padat yang digunakan dalam sistem
tegangan tinggi super konduktor magnet pengembangan sebagai isolasi
penghalang. Isolasi padat material dalam aplikasi cryogenic membutuhkan kharacteristicsas dielektrik yang sangat baik serta sifat mekanik yang kuat.
Pada penelitian ini, percobaan dielektrik untuk tiga jenis bahan isolasi padat,
termasuk diperkuat serat gelas plastik (GFRP), epoxy (Stycast 2850FTJ), dan Bakelite
dalam nitrogen cair (LN2) pada 77 temperature dilakukan. Setiap percobaan pada
bahan isolasi padat dilakukan sesuai dengan jenis tegangan yang diberikan
(impuls petir dan tegangan ac) dan tekanan sistem (0,1 ~ 0,4 MPa).
percobaan mempertimbangkan efek susun lembaran isolasi dilakukan. Semua
tegangan breakdown listrik diamati ketika bahan isolasi padat sepenuhnya
ditembus. Percobaan kerusakan listrik pada GFRP dan Bakelite lembar sesuai
dengan jumlah penumpukan dilakukan dan hasilnya dibandingkan. Hubungan antara
karakteristik dielektrik bahan isolasi padat dan distribusi intensitas medan
listrik dihitung dan dianalisis dengan metode elemen hingga (FEM). Hasil
penelitian menunjukkan bahwa karakteristik dielektrik bahan isolasi padat di
LN2 secara langsung dipengaruhi oleh distribusi intensitas medan listrik dan
the number lembar susun. Indeks Syarat-Bakelite, karakteristik dielektrik,
GFRP, isolator padat, susun, Stycast.

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