نظرة عامة على المنتج
التعريف الوظيفي
The JZZBJ9-10(A.B.C) series current transformers are precision electromagnetic instruments designed for accurate current measurement, energy metering, and relay protection applications in medium-voltage AC power systems. These transformers utilize electromagnetic induction principles to provide galvanically isolated secondary current signals proportional to primary current.
التصنيفات الرئيسية
| البند | المواصفات (حسب الطلب / لوحة البيانات) |
|---|---|
| System voltage class | 10 kV class (indoor switchgear and distribution applications) |
| Rated frequency | __PRESE60 Hz9_0__ (60 Hz متاح عند الطلب) |
| Rated secondary current | __PRESE5 AD_9_0__ or 5 A |
| Accuracy classes | قياس and/or protection cores كما هو محدد (e.g., 0.2S / 0.5, 10P10) |
| Rated burden | Per core/winding كما هو محدد (VA) |
| حمل power factor | cosφ = 0.8 (lagging) ما لم يتم تحديده بخلاف ذلك by the project قياسي |
| FS / ALF (حيث تم تحديده) | قياس security factor (FS) and protection accuracy limit factor (ALF) per ordered specification |
| Short-circuit withstand | Ith (1 s) and Idyn (peak) كما هو محدد |
| Insulation level | Per applicable قياسي and project specification |
| Applicable standards | __PRESERVED_4_IEC 61869EC 61869-2; GB/T 20840.1 / 20840.2; __PRESERVED_6_GB 558397; GB 5583-85 (PD حيث تم تحديده) |
| Mechanical variants | __PRESERVED_0__PRESERVED_0LZZBJ9-10C0B / LZZBJ9-10C |
عرض المنتج
مبدأ العمل
Operating on Faraday’s law of electromagnetic induction, the transformer features a toroidal magnetic core with primary conductor passing through the aperture and secondary windings wound around the core. The magnetic flux generated by primary current induces proportional voltage in the secondary winding, delivering standardized output current through connected burden.
System التطبيق Position
- Medium Voltage Distribution: 6-10kV switchgear and distribution panels
- Energy قياس: Revenue-grade electricity measurement systems
- حماية Circuits: Overcurrent, differential, and distance protection schemes
- SCADA Integration: Supervisory control and data acquisition systems
نظرة عامة هيكلية
راتنج الإيبوكسي cast construction with fully-enclosed design ensures superior insulation performance, moisture resistance, and mechanical strength. The post-type mounting configuration provides compact installation in constrained switchgear environments while maintaining excellent electrical clearance and creepage distances.
تسمية الموديل
Code الشرح
- L — Current transformer (CT)
- Z — للداخل support (pillar) type
- Z — Cast-resin (epoxy) insulated, fully enclosed structure
- B — حماية configuration available (metering/protection application
- J — Reinforced design
- 9 — Design code (platform/iteration)
- 10 — Voltage class (kV)
- A / B / C — Mechanical variant code (installation/structure differences)
اختلافات المتغيرات
__PRESERVED_LZZBJ9-10BPRESERVED_0_28__ and LZZBJ9-10C are electrically equivalent when specified with the same ratio, accuracy classes, burdens, and Ith/Idyn. The differences between A/B/C variants are primarily mechanical and installation-related to match different switchgear layouts and mounting constraints.
ظروف الخدمة
The LZZBJ9-10 series current transformers are designed for indoor operation under normal service conditions in medium-voltage power systems.
- Installation environment: للداخل installation only
- Altitude: Not exceeding 1000 m above sea level (higher altitude shall be specified for engineering confirmation)
- Ambient temperature: −__PRESERV40 °C2__ to +40 °C
- Relative humidity: Daily average ≤ 95%, monthly average ≤ 90% (at +20 °C reference)
- Environmental conditions: Free from corrosive gases or vapors; free from explosive or flammable media; no severe vibration, mechanical shock, or impact
البناء
البناء Design
- Structure: Support (post) type for indoor switchgear
- Insulation: Fully enclosed epoxy resin cast insulation
- Core: Ring-type magnetic core design
- System: Integrated primary and secondary insulation system
The epoxy resin casting provides stable insulation properties and resistance to moisture, contamination, and aging for long-term indoor service.
اللفات & وضع العلامات على المحطات
- Primary terminals: P1 / P2
- Secondary terminals (Group 1): __PRES1S2ED_14_1__ / 1S2
- Secondary terminals (Group 2): __PRES2S2ED_14_1__ / 2S2
Terminal markings follow قياسي CT polarity conventions. Under normal operating conditions, the reference current direction is defined from P1 to P2. Correct terminal identification shall be observed to ensure metering and protection performance.
البيانات الفنية
This section provides selection-oriented technical data for the LZZBJ9-10 (A/B/C) series indoor, cast-resin current transformer used in 10 kV clas50 Hzsystems (50 Hz). Data shown below is intended for preliminary selection of accuracy class combinations, rated burdens, and short-circuit withstand capability.
Definitions: فئة الدقة combination indicates available metering/protection cores in one CT (multi-core configuration may apply). Rated output (VA) is specified per secondary core. Ith is the rated short-time thermal current (typically 1 s). Idyn is the rated dynamic current (peak).
Notation: Ith/Idyn may be expressed as kA or as multiples of rated primary current (×In) depending on configuration; acceptance shall be based on nameplate values and the factory test report.
مرجع البيانات
| Rated Primary Current (A) |
فئة الدقة | المخرج المقنن (VA) |
Short-time Thermal Current (Ith) |
Rated Dynamic Current (Idyn) |
|---|---|---|---|---|
| 5–100 | 0.2S / 10P10 | 10 / 15 | 150 × In | 375 × In |
| 150–200 | 0.2S / 0.5 / 10P10 | 10 / 15 / 15 | 21.5 kA | 54 kA |
| 300–400 | 0.5 / 10P10 | 10 / 15 | 31.5 kA | 80 kA |
| 500–600 | 0.2 / 10P10 | 10 / 15 | 45 kA | 112.5 kA |
| 800 | 0.2S / 10P10 0.2S / 0.5 / 10P10 0.5 / 10P10 0.2 / 10P10 |
10 / 15 10 / 10 / 15 10 / 15 10 / 15 |
63 kA | 130 kA |
| 1000 | 0.2S / 10P10 0.2S / 0.5 / 10P10 0.5 / 10P10 0.2 / 10P10 |
10 / 15 10 / 10 / 15 10 / 15 10 / 15 |
80 kA | 160 kA |
| 1200 | 0.2S / 10P10 0.2S / 0.5 / 10P10 0.5 / 10P10 0.2 / 10P10 |
10 / 15 10 / 10 / 15 10 / 15 10 / 15 |
80 kA | 160 kA |
| 1500 | 0.2S / 10P10 0.2S / 0.5 / 10P10 |
10 / 15 10 / 10 / 15 |
100 kA | 160 kA |
| 2000 | 0.5 / 10P10 0.2 / 10P10 |
10 / 15 10 / 15 |
100 kA | 160 kA |
التطبيق Scenarios
التطبيقات الأساسية
- Medium-voltage switchgear: Ring main units (RMU), metal-clad switchgear, load break switch panels, circuit breaker panels, motor control centers
- قياس and revenue collection: Electricity meters (including Class 0.2S applications), power quality monitoring, energy management and SCADA integration
- حماية relay systems: Overcurrent protection, differential schemes, feeder protection, motor protection and monitoring
- Industrial power distribution: Manufacturing power monitoring, process automation, critical load monitoring, energy efficiency optimization
بيئات التركيب
| نوع البيئة | الخصائص | اعتبارات هندسية |
|---|---|---|
| للداخل substations | Controlled environment, minimal contamination | المعيار configuration suitable under normal service conditions |
| Industrial plants | Possible dust, vibration, and chemical exposure | Specify vibration level and contamination conditions; confirm installation clearances and maintenance access |
| Coastal / high humidity | High humidity and salt fog, risk of condensation | Specify humidity/condensation control and pollution conditions as project requirements; confirm creepage/clearance compliance |
| High dust environments | Dust accumulation and increased surface contamination risk | Specify pollution conditions and cleaning/inspection plan; confirm installation spacing and cable routing |
| High altitude sites | Reduced air density affecting insulation performance | Specify altitude at ordering stage for insulation coordination confirmation |
المعايير & Normative References
| المعيار | العنوان | التطبيق |
|---|---|---|
| IEC 61869-1 | Instrument Transformers – Part 1: General Requirements | General requirements |
| IEC 61869-2 | Instrument Transformers – Part 2: Additional Requirements for Current Transformers | CT-specific requirements |
| GB/T 20840.1 | Instrument Transformers – Part 1: General Requirements | National قياسي (aligned with IEC 61869 framework) |
| GB/T 20840.2 | Instrument Transformers – Part 2: Current Transformers | National CT requirements (aligned with IEC 61869-2) |
| GB 1208-1997 | Current Transformers | National CT قياسي حيث تم تحديده by the project |
| GB 5583-85 | Partial Discharge Level Requirements | Partial discharge requirements حيث تم تحديده by the project |
| IEEE C57.13 | المعيار Requirements for Instrument Transformers | Optional (North America project reference) |
| IEC 60068-2-17 | Environmental Testing – Salt Mist | Optional (project-specific environmental validation) |
| IEC 60085 | Electrical Insulation – Thermal Evaluation | Optional (insulation thermal evaluation reference) |
امتثال اختبار المصنع
- Routine tests per applicable IEC/GB requirements (including polarity/marking, ratio verification, and accuracy verification per specified class and burden)
- Dielectric tests per insulation coordination requirements and applicable قياسي
- Partial discharge test حيث تم تحديده by the project requirement
- Visual and dimensional inspection including marking and workmanship conformity
- Type and special tests as required by the project specification
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformer shall be securely mounted using the designated fixing holes.
- Primary conductor connection may be made via busbar or bolted terminals, depending on the variant.
- Adequate clearance shall be maintained for insulation, heat dissipation, and maintenance access.
المخططات
LZZBJ9-10A
LZZBJ9-10B
LZZBJ9-10C
ملاحظات السلامة
- Secondary circuit must never be left open when the transformer is energized, as dangerous high voltage may appear across the secondary terminals.
- During inspection or maintenance, the secondary circuit shall be short-circuited before disconnecting any instruments.
- One point of the secondary circuit should be reliably grounded in accordance with applicable standards.
- All installation and maintenance work shall comply with local electrical safety regulations.
معلومات الطلب
When placing an order, the required configuration shall be specified according to the local grid requirements, applicable standards, and project technical specification. The following parameters shall be clearly stated for technical confirmation and production release:
- Rated primary current / transformation ratio
- Rated secondary current (__PRESE5 AD_9_2__ or 5 A)
- التطبيق and accuracy requirements (metering and/or protection accuracy class combination)
- Rated burden (VA) for each secondary core/winding
- Short-circuit withstand requirements: Ith (1 s) and Idyn (peak)
إرشادات الاختيار
1: Determine rated primary current (Ip) based on feeder/load rating and expected operating range.
2: Select metering and/or protection accuracy requirements (e.g., 0.2S / 0.5 for metering; 10P10 for protection).
3: Confirm rated burden (VA) for each secondary circuit based on connected meters/relays and wiring losses.
4: Verify short-circuit withstand capability (Ith/Idyn) against the switchgear fault level.
If local utility or project requirements apply (e.g., insulation level, partial discharge limit, terminal arrangement, mounting constraints, documentation language, or required certificates), specify them at the ordering stage. Special configurations shall be confirmed by technical agreement and final data sheet prior to production.