Ga abu da Dukkar da Cikakkeni ga Tafin Masu Kirkiro Karamin Kirkiro (LV CT)
I. Background na ɗanƙasa
A cikin abubuwa da ke sahihi sosai kamar smart grids, metering ta tattalin arziki, da yanayin karkashin shirya, an samun rashin da suka faruwa a cikin current transformers da ke sahihi sosai (LV CTs) masu karfi, kamar sahihi ba tabbas, tsayi mai yawa da tsayi, da kuma inganci mai yawa a lokacin tsohon shekaru. Don in tabbatar da abubuwan da suka faruwa a matsayin 0.2S/0.5S-class da sahihi sosai, wannan ɗanƙasa ya bayar da ɗanƙasa mai yawa don LV CTs ta hanyar ziyartar matukar gwiwa da kuma koyarwar gwiwa.
II. Fasahar ƙwarewa masu ma'ana
- Matsayin ƙwarewa mai yawa
• Nanocrystalline/Amorphous Alloy Ultra-Thin Strips:
An kara core da nan da ƙwarewar nan da dama 0.02-0.025mm, wanda ya haɗa da muhimmanci mai yawa (μi) da 1.5×10⁵ H/m. Wannan ya gudanar da tsayi mai yawa da kuma koyarwar ratio/phase.
• Magnetic Domain Optimization:
An yi annealing da magnetic field direction, wanda ya gudanar da stress na core, ya haɗa da uniformity na flux, da kuma koyarwar hysteresis losses a lokacin harmonics da take da tsayi. - Magnetic Shielding da Koyarwar Interference
• Multi-Layer Composite Magnetic Shielding:
An saka dual Permalloy + copper mesh shielding layers daidai core don koyarwar interference da take da AC magnetic field da kuma koyarwar DC bias effects.
• Orthogonal Winding Process:
An yi segmented orthogonal winding technology don secondary windings, wanda ya gudanar da distributed capacitance da leakage inductance, ya haɗa da frequency response (accuracy deviation < ±0.1% within 1–5kHz bandwidth). - Temperature Compensation da Signal Processing
• Dynamic Temperature Compensation Circuit:
Integrated high-linearity NTC/PTC sensors sun ci gaba da temperature drift a cikin core permeability da winding resistance (temp. drift coefficient ≤ ±10 ppm/°C).
• High-Stability Sampling Resistor:
Low-drift metal foil resistors (ΔR/R < ±5 ppm/°C) da four-terminal Kelvin connections sun haɗa da accuracy na current-to-voltage conversion. - Encapsulation da Insulation Reinforcement
• Vacuum Potting Process:
High-purity epoxy resin potting da 10⁻³ Pa ya gudanar da bubbles da internal stress, ya haɗa da mechanical strength da thermal stability.
• Multi-Layer Insulation Architecture:
Polyimide film + silicone composite interlayer insulation ya haɗa da dielectric strength >15 kV/mm da partial discharge <5 pC (@1.5Ur).
III. Abubuwan da suka haɗa
|
Parameter |
Conventional CT |
This Solution |
Improvement |
|
Accuracy Class |
0.5–1.0 |
0.2S/0.5S |
Ratio/Phase errors ↓50% |
|
Temp. Drift Coeff. |
±100 ppm/°C |
±10 ppm/°C |
10x better stability |
|
Long-Term Stability |
±0.3%/year |
±0.05%/year |
Lifetime error controllable |
|
Phase Error (1%In) |
>30' |
<5' |
Phase precision ↑6x |
|
Operating Temp. |
-25°C~+70°C |
-40°C~+85°C |
Enhanced extreme-environment adaptability |
IV. Tsarin Yadda Ake Amfani Da Ita
Wannan ɗanƙasa ya fi amfani da ita a:
• Power Metering: Smart meters, distribution network automation systems (compliant with IEC 61869-2 standard)
• Renewable Energy Monitoring: High-precision current sampling in PV inverters and energy storage systems
• Industrial Control: Fault current detection in VFDs and motor protection devices
• Lab Standards: Serving as 0.2S-class standard transformers for value transfer
