Product Overview
Functional Definition
The JSZV12-20R ثلاثي الطور راتنج الإيبوكسي combination محول الجهد with built-in حماية الصمامات is specifically designed for XGW-12 للخارج AC fixed metal-enclosed معدات التبديل applications. This محول الجهد provides both 100V measurement voltage الإخراج and 220V operating power supply, delivering stable power to circuit breakers while ensuring reliable operation and system efficiency.
Key Ratings
| Item | Specification |
|---|---|
| System voltage class | 12 kV class (للخارج معدات التبديل applications, rated 20 kV) |
| Rated frequency | 50 Hz |
| Rated primary voltage | 20 kV / √3 |
| Rated secondary voltage | 100V, 220V (as specified) |
| Accuracy classes | 0.2, 0.5 (القياس applications) |
| Primary connection | V-connection (open-delta) |
| Fuse protection | Built-in primary winding fuse protection |
| Insulation level | 24/65/125 kV (Um/Ud/Up) |
| Applicable standards | GB 1207-1997 |
Working Principle
Operating on electromagnetic induction principles, the محول الجهد features ثلاثي الطور راتنج الإيبوكسي cast cores with primary and secondary اللفات. The transformer steps down جهد عالي to standardized measurement and auxiliary supply voltages, providing galvanically isolated secondary outputs proportional to الجهد الأولي. The V-connection configuration enables voltage measurement with two أحادي الطور units while also detecting ground faults in the system.
System التطبيق Position
- Medium Voltage Distribution: 12-20kV للخارج metal-enclosed معدات التبديل (XGW-12 series)
- Voltage القياس: Revenue-grade electricity measurement and voltage monitoring systems
- Auxiliary Power Supply: Providing operating power for قواطع الدوائر control and الحماية circuits
- Protection Schemes: فرط الجهد, انخفاض الجهد, and عطل الأرضي الحماية applications
Structural Overview
Epoxy resin cast البناء with fully-enclosed design ensures superior insulation performance, moisture resistance, and mechanical strength. The built-in حماية الصمامات located at the primary الإخراج terminals provides easy replacement and الصيانة access. The compact structure integrates voltage measurement and الطاقة المساعدة supply functions in a single unit, optimizing التركيب space in metal-enclosed معدات التبديل البيئات.
Model Designation
Model Code Explanation
- J — محول الجهد (VT)
- S — ثلاثي الطور configuration
- Z — Cast-resin (epoxy) insulated structure
- V — V-connection (open-delta) configuration
- 12 — Voltage class (kV)
- 20 — Rated voltage (kV)
- R — Built-in fuse protection
Service Conditions
The JSZV12-20R محول الجهد is designed for للخارج metal-enclosed معدات التبديل التركيب under normal ظروف الخدمة in medium-voltage power systems.
- Installation environment: للخارج metal-enclosed معدات التبديل (XGW-12)
- Altitude: ≤1000 m above sea level (pollution level II)
- Ambient temperature: −5°C to +40°C
- Relative humidity: ≤80%
- Environmental conditions: Free from corrosive gases or vapor; free from carbon dust or conductive metallic dust; no severe vibration or mechanical shock
Construction
Construction Design
- Structure: ثلاثي الطور combination النوع for للخارج switchgear
- Insulation: Fully enclosed راتنج الإيبوكسي cast insulation
- Connection: V-connection (open-delta) configuration
- Protection: Built-in fuse at primary الإخراج terminals
- System: Integrated voltage measurement and الطاقة المساعدة supply
The راتنج الإيبوكسي casting provides stable insulation properties with excellent resistance to moisture, contamination, and aging for long-term للخارج معدات التبديل service. The built-in حماية الصمامات system prevents primary winding short-circuit conditions, enhancing overall system safety and reliability.
Windings & Terminal Marking
- Primary terminals: A, B, C (phase connections)
- Secondary terminals (100V): a, b, c, n (measurement voltage الإخراج)
- Secondary terminals (220V): 110V and 220V الطاقة المساعدة terminals
Terminal markings follow المعيار VT polarity conventions. Correct terminal identification shall be observed to ensure القياس accuracy and الحماية performance. The الطاقة المساعدة terminals provide stable operating voltage for قواطع الدوائر دوائر التحكم and الحماية relays.
Technical Data
This section provides selection-oriented البيانات الفنية for the JSZV12-20R ثلاثي الطور راتنج الإيبوكسي combination محول الجهد with built-in fuse used in 12-20 kV class AC systems (50 Hz). Data shown below is intended for preliminary selection of voltage ratio, فئة الدقة, and rated الإخراج capacity.
Definitions: Accuracy class indicates القياس performance level. Rated الإخراج (VA) is the maximum burden that can be connected while maintaining specified accuracy. Load power factor is assumed as cosφ = 0.8 (lagging).
Data Reference
| Model | Rated Voltage Ratio (V) |
Class 0.2 Output (VA) |
Class 0.5 Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JSZV12-20R | 20000/100 | 30 | 50 | 24/65/125 |
| JSZV12-20R | 20000/100/100 | 20 | 50 | 24/65/125 |
| JSZV12-20R | 20000/220 | 20 | 50 | 24/65/125 |
| JSZV12-20R | 20000/100/220 | 20 | 50 | 24/65/125 |
Standards & Normative References
| Standard | Title | Application |
|---|---|---|
| GB 1207-1997 | Voltage Transformers | VT general requirements and testing |
| IEC 61869-3 | Instrument Transformers – Part 3: Voltage Transformers | Optional (international reference) |
Factory Test Compliance
- Routine tests per GB 1207-1997 requirements (including polarity verification, ratio verification, and accuracy verification per specified class and burden)
- Dielectric tests per insulation coordination requirements and applicable standard
- Visual and dimensional inspection including marking and workmanship conformity
- Type and special tests as required by the project specification
Installation & Dimensions
Outline
Principle diagram
- Outline dimensions and mounting details are provided in the معدات التبديل documentation
- The transformer shall be securely mounted using the designated fixing holes within the XGW-12 معدات التبديل compartment
- Primary connections are made via busbar terminals integrated with the معدات التبديل design
- Adequate clearance shall be maintained for insulation, heat dissipation, and الصيانة access
- Built-in حماية الصمامات is accessible from the front panel for easy replacement
Safety Notes
- Secondary circuit must be properly grounded in accordance with applicable standards
- During inspection or الصيانة, the primary circuit shall be de-energized and properly isolated
- Fuse replacement shall only be performed by qualified personnel following proper safety procedures
- All التركيب and الصيانة work shall comply with local electrical safety regulations
Ordering Information
When placing an order, the required configuration shall be specified according to the local grid requirements, applicable المعايير, and project technical specification. The following parameters shall be clearly stated for technical confirmation and production release:
- Rated voltage ratio (primary/الجهد الثانوي)
- Rated secondary voltage (100V, 220V, or combined configuration)
- Accuracy class (0.2 or 0.5 for القياس applications)
- Rated burden (VA) for each secondary winding
- Application requirements (voltage measurement and/or الطاقة المساعدة supply)
If local utility or project requirements apply (e.g., مستوى العزل, 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.