Overview
The JSZW3-6G / JSZW3-10G is a mining flameproof combined switch three-phase voltage transformer designed for 6kV, 10kV, 11kV, and 12kV class indoor medium-voltage systems. It features an epoxy cast-resin insulated structure suitable for harsh mine environments, providing reliable voltage transformation with high mechanical strength and insulation stability.
This transformer supports accuracy classes of 0.2/6P(3P), 0.5/6P(3P), and 1/6P(3P), making it suitable for metering, protection, control signal acquisition, and voltage monitoring in mining flameproof combined switchgear. It complies with international standards for mine-duty electrical equipment and operates at 50Hz or 60Hz rated frequency.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Voltage Class | 6kV, 10kV, 11kV, 12kV |
| Rated Frequency | 50Hz / 60Hz |
| Typical Voltage Ratio | 6000/100V, 10000/100V, 11000/110V, 12000/110V |
| Accuracy Class | 0.2 / 6P(3P), 0.5 / 6P(3P), 1 / 6P(3P) |
| Limit Output | 600VA |
| Insulation Type | Epoxy cast-resin |
| Phase Configuration | Three-phase integrated |
| Installation Form | Vertical or horizontal |
| Application Environment | Mining flameproof combined switchgear |
| Primary Use | Voltage measurement, protection, control signal |
| Design Standard | Mine-duty medium-voltage distribution |
| Output Isolation | Galvanically isolated secondary |
Model Designation
- J: Voltage transformer / potential transformer
- S: Three-phase configuration
- Z: Epoxy resin casting insulation
- W: Voltage transformer structure code
- 3: Design sequence code
- 6 / 10 / 11 / 12: Rated voltage class reference in kV
- G: Mining flameproof combined-switch application type
- Vertical / Horizontal: Installation arrangement according to switchgear internal layout
Construction
The JSZW3-G series features a three-phase integrated epoxy cast-resin construction, ensuring excellent dielectric strength, mechanical robustness, and resistance to environmental stress in underground mining applications. The solid cast-resin encapsulation eliminates the need for oil or gas insulation, enhancing safety in flameproof enclosures. Primary and secondary windings are fully embedded within the resin matrix, providing uniform electric field distribution and long-term operational reliability. Terminal blocks are positioned for easy access within compact switch compartments, supporting both vertical and horizontal mounting orientations to accommodate diverse flameproof switch designs.
Technical Parameters
Service Conditions
- Installation location: indoor mining flameproof combined switchgear
- Rated frequency: 50Hz / 60Hz
- Ambient temperature: -25°C to +40°C
- Suitable for: mine-duty switchgear compartments and compact electrical assemblies
- Installation environment requirements: free from direct water ingress, severe conductive pollution and insulation-damaging chemical vapor.
- Underground mine considerations: vibration, humidity, condensation and flameproof enclosure compatibility should be confirmed by the complete equipment manufacturer.
Technical Parameters
The JSZW3-G series is a three-phase epoxy cast-resin inductive voltage transformer designed for 6kV to 12kV class systems. It operates within an ambient temperature range of -25°C to +40°C, complies with IEC 61869-3, IEC 61869-1, and GB/T 20840.3-2013 standards, and supports standard rated outputs up to 600VA with accuracy classes suitable for both measurement and protection applications.
| Type | Voltage Ratio(V) |
Accuracy class / Rated output (VA) |
Limit output(VA) |
Rated insulated level(kV) |
|---|---|---|---|---|
| JSZW3-6G | 6000/√3 100/√3 /100 |
0.2/6P(3P)—3*15/100 | 600 | 7.2/30/60 |
| 0.5/6P(3P)—3*30/100 | ||||
| 1.0/6P(3P)—3*50/100 | ||||
| JSZW3-10G | 10000/√3 100/√3 /100 |
0.2/6P(3P)—3*15/100 | 600 | 12/42/75 |
| 0.5/6P(3P)—3*30/100 | ||||
| 1.0/6P(3P)—3*50/100 |
Installation & Wiring
Outline Dimensions
The outline dimensions drawing provides critical mechanical data including mounting hole positions, transformer height, and phase bushing clearances. These dimensions must be confirmed by the OEM to ensure compatibility with the mining flameproof combined switch enclosure and to allow adequate maintenance access.
Wiring Diagram
The wiring diagram shows terminal markings and secondary connections for the JSZW3-6G / JSZW3-10G voltage transformer. Secondary terminals are designated according to standard practice, and their direction must be confirmed before designing the control circuit of the complete switch assembly. Ensure correct polarity and connection sequence as indicated in the diagram.
Selection & FAQs
Selection Guide
- Select the appropriate voltage class (6kV or 10kV nominal; note that 11kV and 12kV may apply per project specifications).
- Choose the required accuracy class—common options include 0.2, 0.5, or 1 for measurement, and 3P or 6P for protection functions.
- Confirm the rated output to match the selected accuracy class and connected load requirements.
- Determine installation orientation: vertical for sufficient height and top clearance, or horizontal for space-constrained switch compartments.
- Specify terminal direction, wiring diagram, mounting drawing, and compliance standards during ordering to ensure mine-duty compatibility.
Frequently Asked Questions
Q1: Can this voltage transformer be installed in underground mining switchgear?
Yes, it is designed for indoor mining flameproof combined switchgear. The complete equipment manufacturer must confirm vibration, humidity, and flameproof enclosure compatibility. Contact us for specific underground installation details.
Q2: What is the maximum limit output for the JSZW3-6G model?
The limit output for the JSZW3-6G three-phase voltage transformer is 600VA. It supports standard rated outputs up to 600VA with accuracy classes for measurement and protection. Specify your exact burden requirements during inquiry.
Q3: Which international standards does this epoxy cast-resin voltage transformer comply with?
It complies with IEC 61869-3, IEC 61869-1, and GB/T 20840.3-2013 standards. These ensure reliable performance for 6kV to 12kV class systems. Request the compliance certificate from our sales team for your project documentation.
Q4: Are there specific environmental restrictions for installing this 10kV voltage transformer?
Yes, the installation environment must be free from direct water ingress, severe conductive pollution, and insulation-damaging chemical vapor. Ambient temperature should remain between -25°C and +40°C. Confirm your site conditions with our engineers.
Q5: Does this three-phase transformer operate on 60Hz power systems?
Yes, the JSZW3-G series supports both 50Hz and 60Hz rated frequencies. It is suitable for compact electrical assemblies across various global markets. Please specify your required frequency when placing your order.
Q6: Where is the JSZW3-10G three-phase voltage transformer typically applied?
It is applied in indoor mining flameproof combined switchgear and mine-duty compartments. The epoxy cast-resin design suits compact electrical assemblies for 6kV to 12kV systems. Contact us for detailed application guidelines.