Overview
The JSZW-10R 10kV Outdoor Epoxy Resin Combined Transformer integrates voltage transformation and current sensing in a single, fully-enclosed unit for accurate metering, voltage monitoring, and relay protection in outdoor 10 kV distribution systems. Its compact design delivers galvanically isolated secondary signals proportional to primary voltage and current, ensuring reliable performance under harsh environmental conditions.
Built with high-performance electromagnetic components and sealed in UV-resistant epoxy resin, the JSZW-10R eliminates oil maintenance, resists moisture and pollution, and supports long-term outdoor service on poles or platforms without degradation in accuracy or insulation integrity.
Key Ratings Snapshot
| Parameter | Value |
|---|---|
| System voltage class | 10 kV (outdoor) |
| Rated frequency | 50 Hz (60 Hz optional) |
| Rated voltage ratio | 10000/â3 : 100/â3 : 100/â3 V |
| Secondary voltage | 100/â3 V (dual windings) |
| Accuracy classes | 0.2 / 0.5 / 1.0 (metering); 6P (protection) |
| Rated burden | 15 / 30 / 60 VA per winding |
| Protection burden | 50 VA (6P class) |
| Maximum output | 300 VA |
| Insulation level | 12/42/75 kV (Um/Up/Ud) |
| Built-in protection | High-voltage fuses (HV side) |
Model Designation
- J: Voltage transformer (VT) function included
- S: Three-phase configuration
- Z: Cast-resin (epoxy) insulated, fully enclosed structure
- W: Outdoor application design
- 10: Voltage class (kV)
- R: Built-in fuse protection (Rong-duan-qi)
Construction
The JSZW-10R features a fully-enclosed epoxy resin cast construction that provides superior insulation, moisture resistance, UV stability, and mechanical strength for reliable outdoor operation. The pole- or platform-mounted design includes integrated high-voltage fuses for primary-side short-circuit protection and a sealed terminal compartment with weather-resistant insulators to prevent internal condensation and contamination.
This maintenance-free design eliminates oil handling, reduces environmental impact, and ensures stable electrical performance across wide temperature ranges and varying humidity levels, making it ideal for rural, industrial, and utility outdoor distribution networks.
Technical Parameters
Service Conditions
- Installation environment: Outdoor pole-mounted or platform-mounted
- Altitude: <= 1000 m (higher altitude requires engineering confirmation)
- Ambient temperature: -25 deg C to +40 deg C (extended range -40 deg C to +40 deg C available)
- Relative humidity: Daily average <= 95%, monthly average <= 90% at +25 deg C
- Environmental exposure: Rain, snow, wind, UV radiation, moderate pollution; no corrosive gases or explosive media
- Pollution level: Moderate (heavier levels require specification)
- Seismic resistance: <= 8 degrees intensity (higher requires confirmation)
Technical Data
| Type | Rated Voltage Ratio (V) |
Accuracy Class & Rated Output (VA) |
Max Output (VA) |
Rated Insulation Level (kV) |
|||
|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 6P | ||||
| JSZW-10R | 10000/√3 : 100/√3 : 100/√3 | 15 | 30 | 60 | 50 | 300 | 12/42/75 |
Installation & Wiring
Installation Diagram
The JSZW-10R is designed for secure pole- or platform-mounted installation using its integrated bracket. Primary connections are made via overhead conductors or busbars, while secondary wiring is routed through the sealed terminal compartment to protect against environmental exposure. Proper phase sequence, polarity, and grounding must be verified before energization.
Outline Dimensions
| Dimension | Value (mm) |
|---|---|
| Total height | 850 |
| Base width | 320 |
| Mounting hole spacing | 250 |
| Primary terminal height | 720 |
| Secondary compartment size | 180 x 120 x 80 |
Selection & FAQs
Selection Guide
- Select 0.2 class accuracy for revenue metering windings; use 0.5 or 1.0 for monitoring applications.
- Choose Yo/Yo/â³ for two metering circuits plus earth fault detection; select Yo/Yo/Yo/â³ if three independent metering outputs are needed.
- Calculate total burden per winding including all connected devices and wiring losses; ensure it does not exceed rated VA for the specified accuracy class.
- Verify that combined burden across all secondaries remains below 300 VA maximum output capacity.
- Specify extended temperature range (-40 deg C), higher altitude, or enhanced pollution rating if operating outside standard service conditions.
- Confirm fuse ratings match system short-circuit levels and coordination requirements during ordering.
Frequently Asked Questions
Q1: Can the JSZW-10R transformer be installed at high altitudes?
Standard models are rated for altitudes up to 1000 meters. For installations exceeding this limit, please contact our engineering team for custom design confirmation.
Q2: Which accuracy class is suitable for protective relaying applications?
The 6P accuracy class with a 50 VA rated output is designed for protection circuits. Specify your exact relay burden during the ordering process.
Q3: What factory tests are performed before shipping the combined transformer?
Standard routine tests verify insulation levels and voltage ratios before dispatch. Please contact our sales team to request specific test certificates or customized validation reports.
Q4: How does the epoxy resin housing perform in severe outdoor weather?
The epoxy resin enclosure provides excellent resistance against UV radiation, rain, and moderate pollution. It is rated for 12/42/75 kV insulation levels for reliable outdoor operation.
Q5: Are extended ambient temperature ranges available for extreme climate projects?
Yes, while the standard range is -25°C to +40°C, an extended -40°C to +40°C option is available. Confirm your specific site temperature requirements during procurement.
Q6: Why choose an epoxy resin combined transformer for outdoor pole mounting?
Epoxy resin offers superior weather resistance and a compact design for pole-mounted 10kV distribution networks. It integrates voltage transformation and insulation in a single outdoor unit.
Q7: Where can this 10kV outdoor combined transformer be deployed globally?
It is designed for global 10kV distribution networks with moderate pollution levels. Please provide your local grid codes during inquiry to ensure full compliance.