Product Overview
Functional Definition
The JDZ9-35 and JDZF9-35 للخارج راتنج الايبوكسي cast محول الجهد are precision electromagnetic instruments designed for accurate voltage القياس, energy القياس والمحاسبة, voltage monitoring, and relay الحماية applications in 35kV medium-voltage AC للخارج power systems. These transformers utilize electromagnetic induction principles to provide galvanically isolated secondary voltage signals proportional to primary voltage.
Key Ratings
| Item | Specification (per order / nameplate) |
|---|---|
| System voltage class | 35 kV class (للخارج medium-voltage التوزيع applications) |
| Rated frequency | 50 Hz (60 Hz available upon request) |
| Rated primary voltage | 35000 V (line-to-ground for single-phase; line-to-line variations available) |
| Rated secondary voltage | 100 V or 220 V (line-to-ground); 100/√3 V (for grounded wye configurations) |
| Accuracy classes | Metering and/or monitoring/الحماية cores as specified (e.g., 0.2, 0.5, 6P) |
| Rated burden | Per core/winding as specified (20-90 VA depending on configuration) |
| Burden power factor | cosφ = 0.8 (lagging) unless otherwise specified by the project standard |
| Maximum output capacity | 300-800 VA depending on model variant |
| Insulation level | 40.5 / 95 / 200 kV (Um / LIWL / ACWL) |
| Applicable standards | IEC 61869-3; GB/T 20840.1 / 20840.3; GB 1207-2006 |
| Model variants | JDZ9-35 / JDZF9-35 / JDZX9-35G / JDZXF9-35G |
Working Principle
Operating on Faraday’s law of electromagnetic induction, the محول الجهد features a laminated magnetic core with primary winding connected to system voltage and secondary windings wound around the core. The alternating magnetic flux generated by primary voltage induces proportional voltage in the secondary winding, delivering standardized output voltage through connected burden. The محول operates in low magnetic flux density region to ensure linearity and accuracy across the specified voltage range.
System التطبيق Position
- Medium Voltage التوزيع: 35kV للخارج substations and التوزيع networks
- Energy القياس والمحاسبة: Revenue-grade voltage القياس systems for billing applications
- Voltage Monitoring: System voltage supervision and power quality monitoring
- Protection Circuits: Overvoltage, undervoltage, and directional الحماية schemes
- SCADA Integration: Supervisory control and data acquisition systems
Structural Overview
Epoxy resin cast construction with fully-enclosed design ensures superior insulation performance, UV resistance, moisture resistance, and mechanical strength. The للخارج post-type mounting configuration provides reliable التركيب in محطة فرعية environments while maintaining excellent electrical clearance and creepage distances suitable for II-grade pollution environments.
Model Designation
Model Code Explanation
- J — محول الجهد (VT)
- D — Single-phase configuration
- Z — Cast-resin (epoxy) insulated, fully enclosed structure
- F — Dual secondary windings (when present)
- X — With tertiary winding for open-delta الحماية (when present)
- 9 — Design code (platform/iteration)
- 35 — Voltage class (kV)
- G — Grounding التطبيق variant (when present)
Variant Differences
| Model | Secondary Windings | Typical Application |
|---|---|---|
| JDZ9-35 | Single secondary winding | Single-purpose القياس والمحاسبة or monitoring |
| JDZF9-35 | Dual secondary windings | Separate القياس والمحاسبة and monitoring/الحماية cores |
| JDZX9-35G | Dual windings + tertiary winding | Metering, monitoring, and ground fault/open-delta protection |
| JDZXF9-35G | Three secondary windings | Metering, monitoring, and dedicated الحماية core |
JDZ9-35 and JDZF9-35 variants are electrically compatible when specified with the same voltage ratio, accuracy classes, and burdens. The F-series provides dual independent secondary windings for simultaneous القياس والمحاسبة and monitoring applications without burden interaction.
Service Conditions
The JDZ9-35/JDZF9-35 series voltage transformers are designed for للخارج operation under normal service conditions in 35kV medium-voltage power systems.
- Installation environment: للخارج التركيب (post-mounted in substations)
- Altitude: Not exceeding 1000 m above sea level (higher altitude shall be specified for engineering confirmation)
- Ambient temperature: −25 °C to +40 °C (daily average ≤ 30 °C)
- Relative humidity: Daily average ≤ 95%, monthly average ≤ 90%
- Pollution grade: Grade II (suitable for areas without severe industrial contamination)
- Environmental conditions: No severe corrosive gases, explosive or flammable media; no abnormal vibration or mechanical shock
- UV and weather resistance: راتنج الايبوكسي structure provides excellent UV resistance and weathering protection
Construction
Construction Design
- Structure: للخارج post-type for محطة فرعية installation
- Insulation: Fully enclosed راتنج الايبوكسي cast insulation with integrated structure
- Core: Silicon steel laminated core design optimized for low flux density operation
- System: Integrated primary and multi-secondary insulation system
- Mounting: Bottom-mounted flange with fixing bolt holes
- Protection: Optional lightning arrester (zinc oxide) integration available
The راتنج الايبوكسي casting provides stable insulation properties and resistance to moisture, UV radiation, contamination, and aging for long-term للخارج service in various climatic conditions.
Windings & Terminal Marking
- Primary terminals: A / X (high-voltage terminals)
- Secondary terminals (Winding 1): a / x or a1 / x1
- Secondary terminals (Winding 2): a2 / x2 (JDZF series)
- Tertiary terminals (Open-delta): ad / xd (JDZX series)
Terminal markings follow standard VT polarity conventions per IEC 61869-3 and GB/T 20840.3. Under normal operating conditions, when primary terminal A is instantaneously positive with respect to X, secondary terminal a is instantaneously positive with respect to x. Correct terminal identification shall be observed to ensure القياس والمحاسبة and الحماية performance.
Technical Data
This section provides selection-oriented technical data for the JDZ9-35 and JDZF9-35 series للخارج, cast-resin voltage transformers used in 35 kV class AC systems (50 Hz standard, 60 Hz available). Data shown below is intended for preliminary selection of فئة الدقة combinations, rated burdens, and maximum output capacity.
Definitions: Accuracy class combination indicates available القياس والمحاسبة/monitoring/الحماية cores in one VT (multi-core configuration may apply). Rated output (VA) is specified per secondary winding. Maximum output (VA) represents the thermal capacity limit of each winding. Insulation level is specified as Um / LIWL / ACWL where Um = maximum system voltage, LIWL = دفقة البرق withstand level, ACWL = AC withstand level.
Notation: Voltage ratios expressed as primary/secondary. For grounded wye systems, line-to-ground voltages apply; divide by √3 where indicated. Acceptance shall be based on nameplate values and factory test report.
Data Reference
| Model | Rated Voltage Ratio (V) |
Accuracy Class Combination |
Rated Output (VA) |
Maximum Output (VA) |
Insulation Level (kV) Um / LIWL / ACWL |
|---|---|---|---|---|---|
| JDZ9-35 | 35000 / 100 35000 / 220 |
0.2 | 50 | 800 | 40.5 / 95 / 200 |
| JDZ9-35 | 35000 / 100 35000 / 220 |
0.5 | 90 | 800 | 40.5 / 95 / 200 |
| JDZF9-35 | 35000 / 100 / 100 35000 / 100 / 220 |
0.2 / 0.2 | 30/30, 30/50, 50/50 | 2 × 400 | 40.5 / 95 / 200 |
| JDZF9-35 | 35000 / 100 / 100 35000 / 100 / 220 |
0.2 / 0.5 | 30/30, 30/50, 50/50 | 2 × 400 | 40.5 / 95 / 200 |
| JDZF9-35 | 35000 / 100 / 100 35000 / 100 / 220 |
0.5 / 0.5 | 30/30, 30/50, 50/50 | 2 × 400 | 40.5 / 95 / 200 |
| JDZX9-35G | 35kV/√3 / 100/√3 / 100/3 | 0.2 / 6P | 30 / 100 | 600 | 40.5 / 95 / 200 |
| JDZX9-35G | 35kV/√3 / 100/√3 / 100/3 | 0.5 / 6P | 90 / 100 | 600 | 40.5 / 95 / 200 |
| JDZXF9-35G | 35kV/√3 / 100/√3 / 100/√3 / 100/3 | 0.2 / 0.2 / 6P | 20/20/100 | 2 × 300 + 100 | 40.5 / 95 / 200 |
| JDZXF9-35G | 35kV/√3 / 100/√3 / 100/√3 / 100/3 | 0.2 / 0.5 / 6P | 25/25/100 | 2 × 300 + 100 | 40.5 / 95 / 200 |
| JDZXF9-35G | 35kV/√3 / 100/√3 / 100/√3 / 100/3 | 0.5 / 0.5 / 6P | 30/30/100 | 2 × 300 + 100 | 40.5 / 95 / 200 |
Standards & Normative References
| Standard | Title | Application |
|---|---|---|
| IEC 61869-3 | Instrument Transformers – Part 3: Additional Requirements for Voltage Transformers | VT-specific requirements |
| IEC 61869-1 | Instrument Transformers – Part 1: General Requirements | General requirements |
| GB/T 20840.3 | Instrument Transformers – Part 3: Voltage Transformers | National VT standard (aligned with IEC 61869-3) |
| GB/T 20840.1 | Instrument Transformers – Part 1: General Requirements | National general requirements (aligned with IEC 61869-1) |
| GB 1207-2006 | Voltage Transformers | National VT standard where specified by the project |
| GB/T 22071.1 | Insulation Coordination for Medium-Voltage Equipment | Insulation level verification |
| IEC 60071-1 | Insulation Co-ordination – Part 1: Definitions, Principles and Rules | Insulation coordination reference |
| GB/T 16927.1 | High-voltage Test Techniques – Part 1: General Definitions and Test Requirements | Dielectric testing requirements |
| IEC 60060-1 | High-voltage Test Techniques – Part 1: General Definitions and Test Requirements | International dielectric test reference |
Factory Test Compliance
- Routine tests per applicable IEC/GB requirements (including polarity/marking verification, ratio verification, voltage error and phase displacement verification per specified فئة الدقة and burden)
- Dielectric tests per insulation coordination requirements:
- Power frequency withstand test (ACWL): 200 kV for 1 minute
- Lightning impulse withstand test (LIWL): 95 kV (positive and negative)
- Partial discharge test per GB/T 20840.1-2010 and GB/T 20840.3-2013 requirements (≤10 pC at 1.2 Um)
- Temperature rise test under الحمل المقنن to verify thermal performance
- Visual and dimensional inspection including marking, workmanship conformity, and التركيب interface verification
- Type and special tests as required by the project specification
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The محول shall be securely mounted using the bottom flange fixing holes with appropriate hardware.
- Primary connection is made via high-voltage busbar or terminal connector at terminal A.
- Terminal X must be properly grounded per system grounding practice.
- Adequate clearance shall be maintained for insulation coordination, heat dissipation, and الصيانة access.
- Lightning الحماية (surge arrester) shall be installed per project requirements.
Outline Drawings
JDZ9-35 / JDZF9-35
Wiring Diagram
Connection Schematic
Safety Notes
- Secondary circuit must have one point reliably grounded (typically terminal x or x1) to ensure personnel السلامة and proper operation.
- During inspection or الصيانة, the primary circuit must be de-energized, isolated, and grounded before any work on secondary circuits.
- Fuses or circuit breakers shall be installed in secondary circuits for الحماية against short circuits.
- All التركيب and الصيانة work shall comply with local electrical السلامة regulations and utility المعايير.
- Regular inspection of راتنج الايبوكسي surface condition, terminal connections, and grounding integrity is recommended.
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 primary voltage (35000 V or 35kV/√3 for grounded systems)
- Rated secondary voltage (100 V, 220 V, or 100/√3 V as applicable)
- Number of secondary windings (single, dual, or triple winding configuration)
- Application and accuracy requirements (القياس والمحاسبة and/or monitoring/الحماية فئة الدقة combination)
- Rated burden (VA) for each secondary core/winding
- Insulation level requirements (standard or enhanced for high-altitude/pollution)
- Frequency (50 Hz standard; 60 Hz if required)
- Special features (if any): lightning arrester integration, enhanced UV الحماية, special mounting arrangements
If local utility or project requirements apply (e.g., enhanced مستوى العزل, specific partial discharge limits, terminal arrangement, auxiliary equipment integration, mounting constraints, documentation language, or required certificates), specify them at the ordering stage. Special configurations shall be confirmed by technical agreement and final datasheet prior to production.