Overview
The JSZJK(F)R2 series is a tri-phase, outdoor dry-type anti-ferroresonance voltage transformer designed for 3kV, 6kV, and 10kV medium-voltage systems (also rated for 11kV and 12kV per international standards). It features cast-resin epoxy insulation, providing excellent weather resistance and maintenance-free operation in harsh outdoor environments.
Available with accuracy classes of 0.2, 0.5, 1, and 3, and rated outputs from 60VA to 600VA, it supports protection, metering, and power quality monitoring applications. The unit complies with GB1207-2006 and IEC60044-2:2003 standards and is specifically engineered to suppress ferroresonance-induced overvoltages in distribution networks.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 3kV / 6kV / 10kV (up to 12kV) |
| Type | Tri-phase, dry-type, anti-ferroresonance |
| Insulation | Epoxy resin cast |
| Accuracy Classes | 0.2, 0.5, 1, 3 |
| Rated Output | 60–600 VA |
| Primary Voltage | 3.6kV / 7.2kV / 12kV (rms) |
| Secondary Voltage | 100/√3 V or 100 V (line-to-line) |
| Frequency | 50 Hz or 60 Hz |
| Installation | Outdoor |
| Standards | GB1207-2006, IEC60044-2:2003 |
| Ferroresonance Protection | Built-in damping circuitry |
| Maintenance | Maintenance-free (oil-free design) |
Construction
The JSZJK(F)R2 series features a robust dry-type construction with epoxy resin encapsulation, ensuring high mechanical strength and environmental resistance. The core and windings are fully embedded in cast-resin insulation, eliminating the need for oil and enabling maintenance-free operation. This design provides excellent protection against moisture, dust, and UV exposure, making it suitable for long-term outdoor deployment in substations and distribution networks. The anti-ferroresonance functionality is integrated through optimized magnetic circuit design and internal damping components that suppress resonant overvoltages withot external circuits.
Technical Parameters
Service Conditions
- Installation position: Outdoor switchgear, substations, or distribution points
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Dry-type epoxy resin
- Frequency: 50Hz or 60Hz
- Grounding: Connect neutral terminal per local electrical codes
- Maintenance: Minimal maintenance required (dry-type design)
Technical Parameters
The JSZJK(F)R2 series is an outdoor dry-type tri-phase anti-ferroresonance voltage transformer designed for 3kV, 6kV, and 10kV systems. It features dry-type epoxy resin insulation, operates within -5°C to +40°C ambient temperature, and is rated for altitudes up to 1000m (higher on request). Compliant with GB1207-2006 and IEC60044-2:2003, it supports multiple accuracy classes and output configurations.
Model Variants
| Model | System Voltage |
International Voltage |
Rated Insulation Level (kV) |
Application |
|---|---|---|---|---|
| JSZJK(F)R2-3W | 3kV | 3.3kV | 3.6/23/40 | Chinese standard 3kV systems |
| JSZJK(F)R2-6W | 6kV | 6.6kV | 7.2/32/60 | Chinese standard 6kV systems |
| JSZJK(F)R2-10W | 10kV | 11kV / 12kV | 12/42/75 | Chinese and international standards |
Voltage Transformer Data – Standard
| Rated Voltage Ratio (V) |
Accuracy Class |
Rated Output (VA) |
Limit Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| 3000/√3 : 100/√3 : 100 | 0.2 | 60 | 1200 | 3.6/23/40 |
| 6000/√3 : 100/√3 : 100 | 0.5 | 120 | 1200 | 7.2/32/60 |
| 10000/√3 : 100/√3 : 100 | 1 | 240 | 1200 | 12/42/75 |
| 10000/√3 : 100/√3 : 100 | 3 | 600 | 1200 | 12/42/75 |
Voltage Transformer Data – Extended
| Rated Voltage Ratio (V) |
Rated Output (VA) |
Limit Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|
| 6000/√3 : 100/√3 : 220/√3 : 100 | 15/150 | 600/600 | 7.2/32/60 |
| 10000/√3 : 100/√3 : 220/√3 : 100 | 30/150 | 600/600 | 12/42/75 |
Installation & Wiring
Installation Diagram
The JSZJK(F)R2-3/6/10W anti-ferroresonance voltage transformer is designed for outdoor installation in switchgear or substations. Mounting is achieved using four M12 bolts with specified front-view spacing of 180-180-200mm and a unit height of 385mm. Side and top views indicate primary bushing placement, secondary terminal box location, and overall dimensions for proper spatial planning.
Wiring Diagram
Connect primary terminals A, B, and C to the three-phase power system. The neutral terminal N must be securely connected to the system ground. Secondary terminals a, b, and c deliver scaled-down voltage outputs for metering and protective relaying. Ensure the secondary circuit neutral point is properly grounded to maintain accuracy and safety. Verify the transformer’s voltage ratio aligns with system requirements prior to commissioning.
Selection & FAQs
Selection Guide
- Select model based on system voltage: JSZJK(F)R2-3W for 3kV, JSZJK(F)R2-6W for 6kV, and JSZJK(F)R2-10W for 10kV, 11kV, or 12kV systems.
- Choose between standard voltage ratio (100/√3 : 100V) or extended configuration (100/√3 : 220/√3 : 100V) depending on measurement needs.
- Pick accuracy class according to application: 0.2 for high-precision metering, 0.5 for standard metering, 1 for general measurement, or 3 for indication.
- Select rated output (60, 120, 240, or 600 VA) to match the connected burden requirements.
- Specify frequency (50Hz or 60Hz), outdoor installation type, and required quantity when placing an order.
Frequently Asked Questions
Q1: How does this voltage transformer prevent ferroresonance in 10kV systems?
The JSZJK(F)R2 series features a built-in anti-ferroresonance design to eliminate resonance overvoltages. It ensures stable operation in ungrounded or resonant-grounded 3kV to 10kV networks. Contact us for specific damping resistor configurations.
Q2: Can this dry-type transformer be installed at high altitudes?
Yes, standard models are rated for altitudes up to 1000m. For installations exceeding this limit, derating or custom insulation design is required. Custom high-altitude configurations are manufactured subject to engineering review.
Q3: Which international standards does the JSZJK(F)R2 voltage transformer comply with?
It complies with both GB1207-2006 and IEC60044-2:2003 standards. The epoxy resin insulation ensures reliable performance across multiple accuracy classes. Request the specific accuracy class datasheet from our engineering team.
Q4: What model variants are available for Chinese standard 6kV systems?
The JSZJK(F)R2-6W model is specifically designed for 6kV systems. It features a 7.2/32/60 kV rated insulation level. Custom terminal configurations are available subject to factory approval.
Q5: Are specific factory test reports provided for the 10kV models?
Routine test documentation is provided according to IEC60044-2:2003 guidelines. Specific type test or special test reports are subject to confirmation based on your project requirements. Please specify your testing needs during inquiry.
Q6: Where is the JSZJK(F)R2 anti-ferroresonance transformer typically applied?
It is primarily used in outdoor switchgear, substations, and distribution points for 3kV to 10kV networks. The dry-type epoxy insulation ensures reliable operation in harsh environments. This design requires minimal ongoing maintenance.
Q7: How should the neutral terminal be grounded during installation?
The neutral terminal must be connected strictly according to local electrical codes. The transformer supports both 50Hz and 60Hz operating frequencies for flexible grid integration. Consult your local engineering standards before final grounding.