Product Overview
Functional Definition
The RECT-0.66 series current transformers are precision electromagnetic instruments designed for accurate current measurement in low-voltage AC power systems. These indoor cast resin transformers utilize electromagnetic induction principles to provide galvanically isolated secondary current signals proportional to primary current in electrical systems with rated insulation up to 0.72/3kV.
The RECT series features three models (RECT-38A, RECT-66A, RECT-78A) with different aperture sizes to accommodate various conductor diameters, making them ideal for energy metering, monitoring, and protection applications in industrial and commercial low-voltage distribution systems.
Product Display
Key Features
- Indoor cast resin insulation for reliable dielectric performance
- Compact window-type design with multiple aperture options (Ø38, Ø66, Ø78)
- High accuracy class 0.2 for precision metering applications
- Wide primary current range from 100A to 800A
- Compliant with GB20840.1-2010 and GB20840.2-2014 standards
- Suitable for 50Hz and 60Hz power systems
Technical Parameters
| Model | Rated Primary Current (A) |
Accuracy Class |
Rated Output (VA) |
Aperture Diameter |
|---|---|---|---|---|
| RECT-38A | 100 | 0.2 | 5 | Ø38mm |
| RECT-66A | 150 | 0.2 | 2.5 | Ø66mm |
| RECT-66A | 200-300 | 0.2 | 12.5 | Ø66mm |
| RECT-78A | 300-800/5 | 0.2 | 12.5 | Ø78mm |
General Specifications:
- Rated Insulation Level: 0.72/3kV
- Rated Frequency: 50Hz / 60Hz
- Rated Secondary Current: 5A or 1A
- Ambient Temperature: -25°C to +40°C
- Standards: GB20840.1-2010, GB20840.2-2014
Note: If parameters required by the user exceed the above ranges, specifications can be determined through consultation with the manufacturer.
Installation & Wiring
The RECT-0.66 series current transformers feature a window-type design for easy installation around conductors or busbars. The primary conductor passes through the aperture (window) of the transformer, requiring no electrical connection to the primary circuit.
Installation Steps:
- Mount the transformer to a flat surface using the base plate mounting holes
- Pass the primary conductor through the aperture
- Connect the secondary wires to the terminal block (S1, S2)
- Ensure proper polarity marking (P1/P2) for accurate measurement
Terminal Configuration:
- Secondary terminals protected by transparent cover
- 3×M5 dual-purpose terminal screws
- Lead seal port for tamper prevention
FAQs
Q1: RECT-0.66 seriyasining aniqlik sinfi va asosiy qo’llanilish sohalari nimada?
RECT-0.66 seriyali tok transformatorlari yuqori aniqlik sinfiga (0.2) ega bo’lib, aniq energiya hisoblagichlari va monitoring tizimlari uchun mo’ljallangan. Ular 0.72/3kV gacha bo’lgan past kuchlanishli o’zgaruvchan tok tizimlarida o’lchash va himoya maqsadlarida ishlatiladi. Transformatorlar elektromagnit induksiya tamoyili asosida ishlaydi va birlamchi tokka proporsional bo’lgan ikkilamchi signalni ta’minlaydi. Bu qurilmalar sanoat va tijorat quvvat taqsimot tizimlarida ishonchli ishlash va aniq ma’lumotlarni uzatish uchun mo’ljallangan.
Q2: O’tkazgich diametriga qarab qaysi RECT modelini tanlash kerak?
O’tkazgich yoki shinaning diametriga qarab to’g’ri modelni tanlash muhim. RECT-38A modeli 38 mm teshik diametriga ega va 100A tok uchun mo’ljallangan. RECT-66A modeli 66 mm teshikka ega bo’lib, 150A dan 300A gacha bo’lgan toklarni qamrab oladi. RECT-78A modeli esa 78 mm teshik diametriga ega va 300A dan 800A gacha bo’lgan yuqori toklarni o’lchash uchun tanlanadi. Har bir model turli o’lchamdagi kabellarga moslashuvchanlikni ta’minlaydi.
Q3: RECT-0.66 tok transformatorini o’rnatish va ulash qanday amalga oshiriladi?
RECT-0.66 seriyasi deraza tipidagi dizaynga ega bo’lib, o’rnatishni osonlashtiradi. Birlamchi o’tkazgich yoki shina transformatorning markaziy teshigidan o’tkaziladi va birlamchi zanjirga hech qanday elektr ulanishi talab qilinmaydi. Qurilmani tekis sirtga mustahkamlang. O’rnatishda atrof-muhit harorati -25°C dan +40°C gacha bo’lishi kerak. Ikkilamchi chiqish 5A yoki 1A bo’lishi mumkin, shuning uchun ulanish sxemasini loyihaga muvofiq to’g’ri tanlash zarur. Barcha ulanishlar standartlarga muvofiq tekshirilishi lozim.
Q4: RECT-0.66 tok transformatorlarini qachon va qanday haroratda ishlatish tavsiya etiladi?
RECT-0.66 seriyali transformatorlar faqat ichki o’rnatish uchun mo’ljallangan bo’lib, yopiq past kuchlanishli quvvat taqsimot tizimlarida qo’llaniladi. Ular -25°C dan +40°C gacha bo’lgan atrof-muhit haroratida ishlash uchun ishlab chiqilgan. Qurilmalar 50Hz va 60Hz chastotali tizimlarda barqaror ishlaydi. Agar loyihangiz ushbu standart harorat yoki chastota chegaralaridan tashqarida ishlashni talab qilsa, aniq sharoitlarni ishlab chiqaruvchi bilan kelishish tavsiya etiladi. Bu qurilmalar sanoat ob’ektlarida xavfsiz ishlashni ta’minlaydi.
Q5: Nima uchun RECT-0.66 seriyasi sanoat tizimlari uchun ishonchli hisoblanadi?
RECT-0.66 seriyasi ichki quyilgan smola izolyatsiyasiga ega bo’lib, yuqori dielektrik ishonchlilikni ta’minlaydi. Ular GB20840.1-2010 va GB20840.2-2014 standartlariga to’liq mos keladi, bu esa xavfsizlik va aniqlikni kafolatlaydi. Kompakt dizayn va turli teshik o’lchamlari sanoat qurilmalariga oson integratsiyani ta’minlaydi. Muntazam vizual tekshiruv va ulanishlarning mustahkamligini nazorat qilish qurilmaning uzoq muddatli va barqaror ishlashini ta’minlaydi. Shu bilan sanoat tizimlaridagi uzilishlarning oldi olinadi.
Q6: Standart parametrlardan tashqari maxsus tok transformatorlari buyurtma qilish mumkinmi?
Ha, agar foydalanuvchining talablari standart diapazonlardan tashqarida bo’lsa, maxsus spetsifikatsiyalarni ishlab chiqaruvchi bilan kelishish mumkin. Standart modellarda birlamchi tok 100A dan 800A gacha, ikkilamchi tok esa 5A yoki 1A ni tashkil qiladi. Maxsus loyihalar uchun ishlab chiqaruvchi qo’shimcha aniqlik sinflari yoki o’zgartirilgan teshik o’lchamlarini taqdim etishi mumkin. Batafsil ma’lumot olish va texnik shartnomani tuzish uchun to’g’ridan-to’g’ri ishlab chiqaruvchi bilan bog’lanishingiz kerak.
Q7: RECT-66A va RECT-78A modellarining nominal chiqish quvvati qancha?
RECT-66A modeli 150A tok uchun 2.5 VA, 200-300A tok uchun esa 12.5 VA nominal chiqish quvvatiga ega. RECT-78A modeli 300-800A tok diapazonida 12.5 VA chiqish quvvatini ta’minlaydi. To’g’ri ishlash uchun ulangan asboblar va relelarning umumiy yuklamasi ushbu nominal qiymatlardan oshmasligi kerak. Aks holda, o’lchash aniqligi pasayishi mumkin. Loyiha uchun aniq yuklama hisob-kitoblarini amalga oshirish va to’g’ri asboblar tanlash muhimdir.