Overview
The JSZW-10 is an indoor three-phase epoxy cast-resin voltage transformer designed for 10kV, 11kV, and 12kV class medium-voltage systems. It features a three-phase integrated cast-resin insulated structure, providing reliable electrical insulation and mechanical stability for indoor applications.
It supports accuracy classes of 0.2, 0.5, and 1 for metering, and 3P or 6P for protection and residual-voltage circuits. The transformer is used in voltage measurement, energy metering, relay protection, and voltage monitoring within neutral non-effectively grounded AC systems operating at 50Hz or 60Hz. It complies with international requirements for IEC-oriented export projects in regions such as Southeast Asia, the Middle East, and Africa.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Voltage class | 10kV / 11kV / 12kV |
| Rated frequency | 50Hz / 60Hz |
| System grounding | Neutral non-effectively grounded |
| Primary voltage | 10kV / √3, 11kV / √3, or 12kV / √3 |
| Secondary voltage | 100V / √3, 100V / 3, 110V / √3, or 110V / 3 |
| Metering accuracy class | 0.2, 0.5, 1 |
| Protection accuracy class | 3P, 6P |
| Insulation type | Epoxy cast-resin |
| Phase configuration | Three-phase |
| Installation environment | Indoor |
| Application functions | Voltage measurement, energy metering, relay protection, residual-voltage monitoring |
| Typical use | Medium-voltage switchgear, distribution rooms, metering panels |
Model Designation
- J: Voltage transformer / potential transformer
- S: Three-phase configuration
- Z: Cast-resin insulated structure
- W: Five-post core structure reference
- 10: 10kV class model reference; applicable to 11kV / 12kV class projects upon confirmation
Construction
The JSZW-10 features a three-phase integrated epoxy cast-resin insulated structure. High-voltage bushings connect the primary windings directly to the medium-voltage system, while the secondary windings deliver standardized low-voltage outputs for measurement, protection, and residual-voltage detection. The entire assembly is encapsulated in flame-retardant epoxy resin, ensuring excellent dielectric strength, moisture resistance, and long-term operational stability in indoor environments. This construction eliminates the need for external insulation maintenance and supports compact installation in switchgear and metering cabinets.
Technical Parameters
Service Conditions
- Installation altitude: up to 1000m above sea level unless otherwise specified
- Ambient temperature: -5°C to +40°C
- Relative humidity: not more than 85% at 20°C reference
- Installation environment: should be free from gas, steam, chemical deposition, pollution, explosive gas or corrosive gas that may seriously affect insulation.
- Mechanical conditions: The installation location should be free from severe vibration, chatter or impact.
- Special environments: For tropical, coastal, high-altitude or high-pollution projects, creepage distance and insulation requirements should be confirmed before ordering.
Technical Parameters
The JSZW-10 series is a three-phase indoor epoxy cast-resin voltage transformer designed for 10kV, 11kV, and 12kV class systems. It operates within an ambient temperature range of -5°C to +40°C and at altitudes up to 1000m, complying with IEC 61869-3, IEC 61869-1, and GB/T 20840.3 standards. Rated outputs and accuracy classes are defined per technical agreement based on application requirements.
| Type | Voltage Ratio(V) |
Accuracy classes combination |
Rated output(vA) |
Limit output(vA) |
Rated insulation level(kV) |
|||
|---|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 3P | |||||
| JSZW-10 | 10000/√3100/√3/100/3 | 0.2/3P | 150 | 240 | 50 | 1200 | 12/42/75 | |
| 0.5/3P | 60 | 50 | 600 | |||||
Installation & Wiring
Installation Diagram
The JSZW-10 is designed for indoor switchgear installation with a base frame. Mounting hole size and position must follow the approved outline drawing. Ensure sufficient clearance for top high-voltage bushings and adequate front access to secondary terminals for wiring and maintenance.
Wiring Diagram
Terminal markings and wiring connections must be selected according to system grounding mode, voltage ratio, and protection requirements. Common secondary voltages include 100/√3, 100/3, 110/√3, and 110/3 V. Residual-voltage windings (if specified) are typically connected in open-delta configuration. Always verify terminal direction and wiring diagram against project specifications before installation.
Selection & FAQs
Selection Guide
- Select the appropriate voltage class (10kV, 11kV, or 12kV) based on your system requirements and project specifications.
- Choose an accuracy class (e.g., 0.2, 0.5, 1 for metering; 3P or 6P for protection) that matches your application needs.
- Confirm the rated output to ensure compatibility with connected instruments and relays.
- Verify system grounding mode—JSZW-10 is suitable for neutral non-effectively grounded or isolated-neutral systems.
- Specify if a residual-voltage winding is required for earth-fault detection or protection functions.
Frequently Asked Questions
Q1: Can this voltage transformer be used on 11kV or 12kV systems?
Yes, the JSZW-10 series is designed for 10kV, 11kV, and 12kV class systems. It complies with IEC 61869-3 and GB/T 20840.3 standards. Please specify your exact system voltage when ordering.
Q2: What are the maximum altitude and temperature limits for installation?
Standard installation altitude is up to 1000m above sea level, with an ambient temperature range of -5°C to +40°C. For high-altitude or extreme climate projects, custom creepage distances are subject to factory confirmation. Contact us for specific environmental adaptations.
Q3: Which accuracy classes are available for this three-phase transformer?
Accuracy classes and rated outputs are defined per technical agreement based on specific application requirements. The epoxy cast-resin design ensures stable performance in indoor environments. Contact our engineering team to finalize the exact class combination.
Q4: How should the installation environment be prepared for this equipment?
The location must be free from severe vibration, explosive gases, and corrosive chemical deposition that affects insulation. Relative humidity should not exceed 85% at a 20°C reference. Verify special coastal or high-pollution conditions with our factory.
Q5: Are these voltage transformers compliant with international IEC standards?
Yes, the JSZW-10 series fully complies with IEC 61869-3, IEC 61869-1, and GB/T 20840.3 standards. We provide standard compliance certificates with every shipment. Request specific test reports during the procurement phase.
Q6: Do you offer customization for tropical or coastal projects?
Yes, customized creepage distances and enhanced insulation requirements are available for tropical, coastal, or high-pollution environments. These special configurations are subject to technical confirmation before ordering. Please share your project specifications for a tailored quote.
Q7: Where is this three-phase indoor epoxy cast-resin transformer applied?
It is applied in 10kV, 11kV, and 12kV class indoor medium voltage switchgear systems. The epoxy cast-resin design provides reliable voltage measurement for power distribution substations. Confirm specific switchgear dimensions with our factory.