Product Overview
Functional Definition
The JSZW3-10 series للداخل ثلاثي الطور combined voltage transformers are precision electromagnetic instruments designed for accurate voltage measurement, قياس الطاقة, and حماية المرحلات applications in medium-voltage AC power systems. These transformers utilize electromagnetic induction principles to provide galvanically isolated الجهد الثانوي signals proportional to الجهد الأولي, serving measurement, القياس, and الحماية functions in للداخل 10 kV class distribution systems.
Key Ratings
| Item | Specification (per order / nameplate) |
|---|---|
| System voltage class | 10 kV class (للداخل معدات التبديل and distribution applications) |
| Rated frequency | 50 Hz / 60 Hz |
| Rated voltage ratio | 10000/√3 / 100/√3 / 100/√3 V (primary/secondary/auxiliary) |
| Winding configuration | Yo/Yo/Δ (JSZW3-10) or Yo/Yo/Yo/Δ (JSZW3-10F) |
| Accuracy classes | 0.2 / 0.5 / 1 for القياس; 6P for protection |
| Rated output | Per winding as specified: 15 VA (0.2 class), 30 VA (0.5 class), 60 VA (1 class), 50 VA (6P class) |
| Maximum output | 300 VA |
| Insulation level | 12/42/75 kV (Um/Ud/Up) or 7.2/32/60 kV for 6 kV variant |
| Applicable standards | GB 1207; IEC 60044-2 |
| Model variants | JSZW3-10 / JSZW3-10F (winding configuration difference) |
Product Shows
Working Principle
Operating on Faraday’s law of electromagnetic induction, the combined محول الجهد features magnetic cores with primary اللفات connected to the جهد النظام and secondary اللفات providing standardized voltage الإخراج. The ثلاثي الطور combined design integrates measurement, القياس, and الحماية functions in a single compact assembly. The auxiliary delta winding (open delta configuration) enables zero-sequence voltage detection for عطل الأرضي الحماية schemes.
System التطبيق Position
- Medium Voltage Distribution: 6-10 kV معدات التبديل and distribution panels
- Energy القياس: Revenue-grade electricity measurement systems
- Protection Circuits: فرط الجهد, انخفاض الجهد, and عطل الأرضي الحماية schemes
- SCADA Integration: Supervisory control and data acquisition systems
- Zero-Sequence Detection: عطل الأرضي and insulation monitoring applications
Structural Overview
Epoxy resin cast البناء with fully-enclosed design ensures superior insulation performance, moisture resistance, and mechanical strength. The ثلاثي الطور combined configuration provides compact التركيب in constrained معدات التبديل البيئات while maintaining excellent electrical clearance and creepage distances. The integral casting eliminates oil-filled البناء, providing الصيانة-free operation and environmental compliance.
Model Designation
Model Code Explanation
- J — محول الجهد (VT)
- S — ثلاثي الطور combined type
- Z — Cast-resin (epoxy) insulated, fully enclosed structure
- W — للداخل installation
- 3 — Design code (platform/iteration)
- 10 — Voltage class (kV)
- F — Four-winding configuration (Yo/Yo/Yo/Δ) when present; المعيار JSZW3-10 is three-winding (Yo/Yo/Δ)
Variant Differences
JSZW3-10: Three-winding configuration with Yo/Yo/Δ connection (two القياس اللفات + one open delta auxiliary winding)
JSZW3-10F: Four-winding configuration with Yo/Yo/Yo/Δ connection (three القياس/الحماية اللفات + one open delta auxiliary winding)
The F variant provides an additional secondary winding for independent القياس and الحماية circuit separation, suitable for applications requiring enhanced functional isolation.
Service Conditions
Installation Environments
The JSZW3-10 series combined voltage transformers are designed for للداخل operation under normal ظروف الخدمة in medium-voltage power systems.
- Installation environment: للداخل التركيب only; free from corrosive gases or vapors; free from explosive or flammable media; no severe vibration or mechanical shock
- Altitude: Not exceeding 3000 m above sea level (higher altitude shall be specified for engineering confirmation)
- Ambient temperature: −5 °C to +40 °C
- Relative humidity: ≤ 85% (at +20 °C reference)
- Environmental conditions: No conducting dust; no condensation that would impair insulation performance
Construction
Construction Design
- Structure: ثلاثي الطور combined النوع for للداخل switchgear
- Insulation: Fully enclosed راتنج الإيبوكسي cast insulation
- Core: ثلاثي الطور core design with integral assembly
- System: Integrated primary and secondary insulation system
- Mounting: Base-mounted configuration with designated fixing points
The راتنج الإيبوكسي casting provides stable insulation properties and resistance to moisture, contamination, and aging for long-term للداخل service. The dry-النوع البناء eliminates oil الصيانة requirements and environmental concerns associated with liquid-filled transformers.
Windings & Terminal Marking
JSZW3-10 (Three-Winding Configuration):
- Primary terminals (A/B/C phases): A / B / C / N (grounded neutral)
- Secondary القياس winding (Group 1): a1-n1 / b1-n1 / c1-n1
- Secondary القياس winding (Group 2): a2-n2 / b2-n2 / c2-n2
- Auxiliary open delta winding: da-dn / db-dn (for zero-sequence voltage)
JSZW3-10F (Four-Winding Configuration):
- Primary terminals (A/B/C phases): A / B / C / N (grounded neutral)
- Secondary القياس winding (Group 1): a1-n1 / b1-n1 / c1-n1
- Secondary القياس winding (Group 2): a2-n2 / b2-n2 / c2-n2
- Secondary الحماية winding (Group 3): a3-n3 / b3-n3 / c3-n3
- Auxiliary open delta winding: da-dn / db-dn (for zero-sequence voltage)
Terminal markings follow المعيار VT polarity conventions. Correct terminal identification shall be observed to ensure القياس and الحماية performance.
Technical Data
This section provides selection-oriented البيانات الفنية for the JSZW3-10 series للداخل, cast-resin combined محول الجهد used in 10 kV class AC systems (50/60 Hz). Data shown below is intended for preliminary selection of فئة الدقة combinations and rated outputs.
Notation: Voltage ratio shown as primary/secondary phase-to-neutral (line-to-ground) values; acceptance shall be based on nameplate values and factory test report.
Data Reference
| Type | Rated Voltage Ratio (V) |
Accuracy Class & Rated الإخراج (VA) |
Max Output (VA) |
Rated Insulation Level (KV) |
|||
|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 6p | ||||
| JSZW3-10 | 10000/3/100/3/100/3 | 15 | 30 | 60 | 50 | 300 | 12/42/75 |
| JSZW3-6 | 6000/3/100/3 | 7.2/32/60 | |||||
| JSZW3-3 | 3000/3/100/3 | 3.6/20/40 | |||||
Standards & Normative References
| Standard | Title | Application |
|---|---|---|
| GB 1207 | Voltage Transformers | National المعيار for voltage transformers |
| IEC 60044-2 | Instrument Transformers – Part 2: Inductive Voltage Transformers | International VT requirements (superseded by IEC 61869-3 for new designs) |
| IEC 61869-3 | Instrument Transformers – Part 3: Additional Requirements for Inductive Voltage Transformers | Current international VT المعيار (reference) |
| GB/T 22071.1 | Instrument Transformers – Part 1: General Requirements | National general requirements (aligned with IEC 61869-1 framework) |
| GB/T 22071.3 | Instrument Transformers – Part 3: Voltage Transformers | National VT requirements (aligned with IEC 61869-3) |
| DL/T 866 | Technical Specifications for Voltage Transformers in Power Systems | Power industry technical specifications |
Factory Test Compliance
- 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 standard
- Partial discharge test where specified by the project requirement
- Visual and dimensional inspection including marking and workmanship conformity
- Type and special tests as required by the project specification
- Zero-sequence voltage verification for open delta winding function
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformer shall be securely mounted using the designated fixing holes on a stable, level foundation.
- Primary connection shall be made to the system busbars or incoming feeders via designated terminals.
- Adequate clearance shall be maintained for insulation, heat dissipation, and الصيانة access.
- The primary neutral terminal (N) must be solidly grounded per applicable المعايير.
Installation Outline
Safety Notes
- Secondary circuit must not be short-circuited when the transformer is energized, as this may cause winding damage and compromise accuracy.
- During inspection or الصيانة, the primary circuit shall be de-energized and isolated before accessing any terminals.
- The primary neutral point must be reliably grounded in accordance with applicable المعايير.
- All التركيب and الصيانة work shall comply with local electrical safety regulations.
- Do not exceed the maximum الحمل المقنن on any secondary winding to avoid accuracy degradation and thermal issues.
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:
- Model designation (JSZW3-10 or JSZW3-10F)
- Rated voltage ratio (primary/secondary)
- Rated frequency (50 Hz or 60 Hz)
- Accuracy requirements (القياس and/or الحماية فئة الدقة per winding)
- Rated burden (VA) for each secondary winding
- Insulation level (Um/Ud/Up per applicable المعيار)
Selection guidance: (1) Determine جهد النظام class (6 kV, 10 kV, or other) based on distribution system design. (2) Select winding configuration (JSZW3-10 three-winding or JSZW3-10F four-winding) based on functional separation requirements. (3) Specify القياس and/or الحماية accuracy requirements (e.g., 0.2 for revenue القياس; 0.5 or 1 for indication; 6P for الحماية). (4) Confirm الحمل المقنن (VA) for each secondary circuit based on connected meters/relays and التوصيلات losses. (5) Verify مستوى العزل against system coordination and applicable المعايير.
If local utility or project requirements apply (e.g., 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.