Product Overview
Functional Definition
The JDZW-10R and JDZW2-10 series outdoor voltage transformers are precision electromagnetic instruments designed for accurate voltage measurement, energy metering, and relay protection applications in 10kV AC power systems. These transformers feature pillar-type structure with fully cast epoxy resin insulation, providing exceptional resistance to UV radiation, electrical arcing, and environmental aging. The compact, lightweight design enables flexible installation in any orientation, while secondary terminals include protective covers with anti-theft measures for enhanced security. These transformers are specifically engineered for outdoor service in ungrounded neutral systems operating at 50 Hz or 60 Hz.
Key Ratings
| Item | Specification (per order / nameplate) |
|---|---|
| System voltage class | 10 kV class (outdoor medium-voltage distribution applications) |
| Rated frequency | 50 Hz or 60 Hz |
| Rated voltage ratio | 10000/100 V, 10000/220 V, 10000/100/100 V, 10000/100/220 V |
| Accuracy classes | Metering: 0.2, 0.5, 1st Class, 3rd Class / Dual core: 0.2/0.2, 0.5/0.5, 0.2/0.5 / Protection: 6P |
| Rated output | 40 VA to 240 VA (single core), 25/25 VA to 40/40 VA (dual core), accuracy class dependent |
| Maximum output | 100 VA (single core), 300/300 VA to 300/800 VA (dual core) |
| Insulation level | 12/42/75 kV (Um / AC withstand / Lightning impulse) |
| Ambient temperature | -25 °C to +40 °C |
| Vibration resistance | 0.4g direct vibration test capability |
| Partial discharge | Complies with GB20840.3-2013 and GB20840.1-2010 |
| Applicable standards | IEC186, GB1207-2006, GB20840.1-2010, GB20840.3-2013 |
| Model variants | JDZW-10R / JDZW2-10 |
Product Shows
Working Principle
Operating on Faraday’s law of electromagnetic induction, the voltage transformer features a laminated magnetic core with primary winding connected to system voltage and secondary windings providing standardized output voltages. The magnetic flux generated by primary voltage induces proportional voltage in secondary windings, delivering single-output (100V or 220V) or dual-output configurations (100V/100V or 100V/220V) through connected burden impedance. The pillar-type construction ensures optimal electromagnetic performance with minimal external interference.
System Application Position
- Medium Voltage Distribution: 10kV outdoor distribution networks and substations
- Energy Metering: Revenue-grade electricity measurement systems in ungrounded neutral networks
- Protection Circuits: Overvoltage, undervoltage, and distance protection schemes
- Relay Protection: Ground fault detection and relay coordination in ungrounded systems
- SCADA Integration: Supervisory control and voltage monitoring for outdoor installations
Structural Overview
Fully cast epoxy resin construction with pillar-type design ensures superior outdoor performance, UV resistance, arc resistance, and long-term aging stability. The sealed structure provides complete protection against environmental factors including moisture, contamination, and temperature extremes. Steel channel base with four mounting holes enables secure installation on various support structures. Secondary terminals feature protective covers with integrated anti-theft mechanisms and convenient wiring access holes. The compact, lightweight design permits installation in any orientation, offering exceptional flexibility for outdoor distribution network configurations.
Model Designation
Model Code Explanation
- J — Voltage transformer (VT/PT)
- D — Outdoor configuration
- Z — Epoxy resin cast insulation
- W — Pillar-type structure
- 10 — Voltage class (10 kV)
- R — Reinforced design variant (JDZW-10R)
- 2 — Design series iteration (JDZW2-10)
Variant Differences
JDZW-10R and JDZW2-10 are electrically equivalent when specified with identical voltage ratios, accuracy classes, and rated outputs. Both variants utilize the same pillar-type structure with epoxy resin cast insulation. Selection between JDZW-10R and JDZW2-10 may depend on specific mechanical mounting requirements, terminal configurations, or regional specification preferences. All electrical performance parameters, insulation levels, and environmental ratings are consistent across both model designations.
Service Conditions
The JDZW-10R and JDZW2-10 series voltage transformers are designed for outdoor operation under specified service conditions in 10kV medium-voltage power systems.
- Installation environment: Outdoor installation, suitable for ungrounded neutral systems
- Altitude: Not exceeding 2000 m above sea level
- Ambient temperature: −25 °C to +40 °C
- Vibration resistance: Withstands direct vibration test intensity of 0.4g
- Environmental protection: UV resistant, arc resistant, aging resistant for extended outdoor service life
- Pollution class: Class II pollution level per applicable standards
Construction
Construction Design
- Structure: Pillar-type for outdoor distribution network installations
- Insulation: Fully cast epoxy resin insulation with complete environmental sealing
- Core: Laminated magnetic core design with high permeability silicon steel
- Base: Steel channel construction with four mounting holes for secure installation
- Environmental protection: UV resistant, arc resistant, aging resistant materials throughout
- Secondary terminals: Protective covers with anti-theft features and wiring access holes
- Installation flexibility: Compact, lightweight design permits installation in any orientation
The fully sealed epoxy resin cast construction provides exceptional resistance to UV radiation, electrical arcing, moisture ingress, contamination, and environmental aging. This design ensures reliable long-term outdoor performance with minimal maintenance requirements.
Windings & Terminal Marking
- Primary terminals: A / X (high-voltage side)
- Secondary terminals (single output): a / x (100V or 220V)
- Secondary terminals (dual output 100V/100V): a1 / x1 and a2 / x2
- Secondary terminals (dual output 100V/220V): a / x (100V) and ad / xd (220V)
Terminal markings follow standard VT polarity conventions per IEC186 and GB1207-2006. Under normal operating conditions, when primary terminal A is positive with respect to X, secondary terminal ‘a’ is positive with respect to ‘x’. Correct terminal identification is critical for accurate metering and protection performance in ungrounded neutral systems.
Technical Data
This section provides selection-oriented technical data for the JDZW-10R and JDZW2-10 series outdoor, pillar-type voltage transformers used in 10 kV class AC systems (50 Hz or 60 Hz). Data shown below is intended for preliminary selection of voltage ratio, accuracy class, rated output capacity, and configuration.
Definitions: Accuracy class indicates metering precision (0.2, 0.5, 1st Class, 3rd Class) or protection performance (6P). Rated output (VA) is specified per accuracy class and secondary winding. Limit output is the maximum thermal capacity. Dual-core configurations are designated as accuracy1/accuracy2 with corresponding output1/output2.
Notation: Insulation level expressed as Um / AC withstand / Lightning impulse (BIL) per IEC186 and GB1207-2006. Partial discharge levels comply with GB20840.3-2013 and GB20840.1-2010.
Data Reference
| Model | Rated Voltage Ratio (V) |
Rated Secondary Output (VA) | Limit Output (VA) |
Rated Insulation Level (kV) |
Wiring Diagram |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1st Class |
3rd Class |
0.2/0.2 | 0.5/ 0.5 |
6P | |||||
| 0.2/0.5 | |||||||||||
| JDZW2-10 JDZW-10R |
10000/100 | 40 | 80 | 200 | 240 | / | / | / | 100 | 12/42/75 | Diagram 1-2 |
| 10000/220 | |||||||||||
| 10000/100/100 | / | / | / | / | 25/25 | 40/40 | / | 300/300 | Diagram 3-4 | ||
Standards & Normative References
| Standard | Title | Application |
|---|---|---|
| IEC186 | Voltage Transformers | General VT requirements and performance specifications |
| GB1207-2006 | Voltage Transformers | National VT standard for design, performance, and testing |
| GB20840.1-2010 | Instrument Transformers – Part 1: General Requirements | General requirements including partial discharge limits |
| GB20840.3-2013 | Instrument Transformers – Part 3: Voltage Transformers | VT-specific requirements including partial discharge testing |
| IEC 60068-2-17 | Environmental Testing – Salt Mist | Optional (project-specific environmental validation) |
| IEC 60085 | Electrical Insulation – Thermal Evaluation | Insulation thermal class reference |
Factory Test Compliance
- Routine tests per IEC186 and GB1207-2006 requirements (including polarity/marking verification, ratio verification, accuracy verification per specified class and burden, and dielectric withstand)
- Partial discharge test per GB20840.3-2013 and GB20840.1-2010 acceptance levels
- Dielectric tests per insulation coordination requirements (AC withstand 42 kV, lightning impulse 75 kV)
- Vibration test to verify 0.4g vibration resistance capability
- Environmental resistance tests including UV exposure, arc resistance, and aging performance (where specified)
- Visual and dimensional inspection including marking accuracy, terminal protection, and workmanship conformity
- Type and special tests as required by project specification
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformer shall be securely mounted using the four mounting holes in the steel channel base.
- Installation orientation is flexible; transformer may be installed in any position due to compact, lightweight design.
- Primary connection per utility standards for 10kV outdoor systems.
- Secondary terminals feature protective covers; wiring access through designated output holes.
- Anti-theft measures integrated into secondary terminal covers per design.
- Adequate clearance shall be maintained for insulation, heat dissipation, and maintenance access per applicable electrical safety codes.
Outlines
JDZW-10R / JDZW2-10 Installation Dimensions
Connection Diagrams
Wiring Diagram 1-2: Single Output Configuration (10000/100V or 10000/220V)
Wiring Diagram 3-4: Dual Output Configuration (10000/100/100V or 10000/100/220V)
Safety Notes
- Primary circuit must be de-energized, isolated, and reliably grounded before any work on the transformer.
- Voltage transformer secondary circuits may be left open-circuit safely; however, proper burden connection is required for accurate operation.
- Secondary terminal protective covers shall be maintained in place except during authorized wiring work.
- Anti-theft mechanisms shall be engaged after wiring completion to prevent unauthorized access.
- Installation on outdoor support structures must ensure structural integrity and electrical clearances per applicable codes.
- All installation and maintenance work shall comply with local electrical safety regulations and utility practices.
Ordering Information
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:
- Model designation (JDZW-10R or JDZW2-10)
- Rated voltage ratio (10000/100V, 10000/220V, 10000/100/100V, 10000/100/220V, or custom)
- Accuracy requirements (metering: 0.2, 0.5, 1st Class, 3rd Class / dual-core: 0.2/0.2, 0.5/0.5, 0.2/0.5 / protection: 6P as applicable)
- Rated output capacity (VA) matched to connected burden for each secondary winding
- Insulation level (standard: 12/42/75 kV or project-specific requirements)
- Environmental conditions (temperature range, altitude, pollution level, special environmental factors)
- Custom requirements (if applicable): special voltage ratios, output configurations, terminal arrangements, mounting provisions, or additional protective features
If local utility or project requirements apply (e.g., custom voltage ratios, special insulation levels, unique terminal configurations, additional environmental protection, specific mounting requirements, documentation language, or required certificates), specify them at the ordering stage. Custom configurations shall be confirmed by technical agreement and final data sheet prior to production.
Customization & Engineering Support
The JDZW-10R and JDZW2-10 series support extensive customization to meet diverse project requirements. Customization options include:
- Tailored voltage ratios beyond standard configurations
- Custom accuracy class combinations for dual-core applications
- Modified output capacity specifications
- Enhanced insulation levels for high-altitude or severe pollution environments
- Special terminal configurations and mounting provisions
- Additional environmental protection features
Engineering support available for burden calculation and secondary circuit design, accuracy class selection for metering and protection applications, insulation coordination for challenging environmental conditions, system integration guidance for outdoor distribution networks, compliance documentation and certification support.