Overview
The JSZW-10 series is a three-phase outdoor epoxy resin cast voltage transformer designed for accurate voltage measurement, energy metering, and relay protection in 10kV AC power systems. Operating at a rated frequency of 50 Hz, it delivers galvanically isolated secondary signals proportional to the primary voltage, ensuring reliable performance in outdoor distribution environments.
Built with electromagnetic induction principles, the transformer features a laminated core and fully enclosed epoxy resin construction, providing excellent insulation, moisture resistance, and mechanical durability for long-term outdoor service under varying weather conditions.
Key Ratings Snapshot
| Item | Specification |
|---|---|
| System voltage class | 10 kV |
| Rated frequency | 50 Hz (60 Hz on request) |
| Rated voltage ratio | 10000/sqrt(3) : 100/sqrt(3) : 100/sqrt(3) V |
| Accuracy classes | 0.2, 0.5, 3P |
| Rated output | 0.2: 75 VA; 0.5/3P: 120 VA |
| Maximum output | 960 VA |
| Burden power factor | cos phi = 0.8 (lagging) |
| Insulation level | 12/42/75 kV (Um/Up/Ud) |
| Creepage distance | Pollution class II compliant |
| Installation type | Outdoor, post-type mounting |
Model Designation
- J : Voltage transformer (VT)
- S : Three-phase configuration
- Z : Cast-resin (epoxy) insulated, fully enclosed structure
- W : Outdoor (weather-resistant) type
- 10 : Voltage class (kV)
Construction
The JSZW-10 features a post-type design with fully enclosed epoxy resin casting using German CY160 material, ensuring superior insulation performance, UV resistance, and protection against moisture and environmental contamination. The sealed support structure and integrated base plate provide mechanical stability and maintain required electrical clearances for safe outdoor operation.
Its C-type laminated magnetic core delivers consistent magnetic performance, while secondary terminals are housed in a sealed terminal box to prevent ingress. This robust construction supports long-term reliability in medium-voltage outdoor distribution systems with minimal maintenance.
Technical Parameters
Service Conditions
- Installation environment: Outdoor installation
- Altitude: Not exceeding 3000 m above sea level
- Ambient temperature: -5 deg C to +40 deg C
- Relative humidity: Daily average <= 85% (at +20 deg C reference)
- Environmental conditions: Free from corrosive gases; pollution class II compliance; no severe vibration or mechanical shock
Technical Data
| Model | Rated Voltage Ratio (V) |
Accuracy Class |
Rated Output (VA) |
Maximum Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|---|
| JSZW-10 | 10000/√3: 100/√3 : 100/√3 | 0.2 | 75 | 960 | 12/42/75 |
| 0.5 | 120 | ||||
| 3P | 120 |
Installation & Wiring
Installation Diagram
The JSZW-10 transformer is mounted vertically using the base plate fixing holes. Primary connections are made to high-voltage terminals A, B, and C, while secondary wiring is accessed via the sealed terminal box. Ensure adequate clearance for insulation, heat dissipation, and maintenance access in accordance with local electrical codes.
Selection & FAQs
Selection Guide
- Specify rated voltage ratio based on system nominal voltage (e.g., 10 kV / sqrt(3) primary)
- Select accuracy class per application: 0.2 for revenue metering, 0.5 for general metering, 3P for protection
- Confirm rated output (VA) matches connected burden for each secondary winding
- Verify insulation level (12/42/75 kV standard) aligns with system requirements
- Ensure environmental conditions (altitude, temperature, pollution class) match service limits
Frequently Asked Questions
Q1: Which accuracy class is best for protective relaying?
Select the 3P accuracy class for protection applications. It provides 120VA rated output specifically designed for relay operation. Confirm your exact burden requirements with our engineering team.
Q2: Can this voltage transformer be installed at high altitudes?
Yes, it supports outdoor installation up to 3000m above sea level. Ensure ambient temperatures remain between -5°C and +40°C. Contact us for derating details if exceeding standard altitude limits.
Q3: How do I configure the multiple secondary voltage ratios?
You must select and use only one voltage ratio during operation. Simultaneous use of multiple ratios is strictly prohibited. Specify your required ratio when placing the order.
Q4: What factory tests are performed before shipment?
Standard routine tests are conducted per IEC and GB standards prior to dispatch. Specific type tests or third-party certifications are subject to confirmation. Please provide your project specifications for exact testing details.
Q5: Are custom terminal box configurations available for this model?
Customization for terminal boxes and mounting dimensions is subject to confirmation. Lead times will vary based on specific engineering modifications. Contact our sales team with your detailed drawings.
Q6: What power systems is this three-phase transformer designed for?
It is designed for 10kV outdoor power distribution and measurement systems. The epoxy resin housing ensures pollution class II compliance. Confirm your specific grid application with our technical support.
Q7: Which insulation level does this 10kV outdoor transformer provide?
The JSZW-10 model offers a rated insulation level of 12/42/75 kV. This ensures reliable performance in standard outdoor switchgear environments. Request the full technical datasheet for detailed dielectric test parameters.