Product Overview
JSZX18-6R / JSZX18-10R is an indoor epoxy cast-resin three-phase voltage transformer with integral primary fuses, designed for medium-voltage switchgear and power distribution systems. It is used for voltage measurement, metering, monitoring, and relay protection in AC systems at 50/60Hz. For overseas projects and export-oriented websites, this model is best presented as a 7.2kV class / 12kV class VT PT potential transformer, suitable for 6kV, 6.6kV, 10kV, and 11kV systems.
The JSZX18 series combines three single-phase transformer units on one base, providing a compact three-phase solution with reliable secondary output and convenient installation. The built-in fuse protection helps improve operational safety and simplifies integration inside metal-enclosed switchgear panels.
Key Features
- Indoor epoxy cast-resin construction for stable insulation and long service life.
- Integral primary fuse protection for safer operation and simplified switchgear design.
- Three-phase integrated structure that saves installation space compared with separate single-phase VTs.
- Suitable for metering and protection, with multiple accuracy class and burden combinations.
- Available for 7.2kV class and 12kV class systems, covering 6kV, 6.6kV, 10kV, and 11kV applications.
- Optional residual voltage / open-delta secondary configurations for insulation monitoring and protection circuits.
Main Applications
This fused medium-voltage potential transformer is widely used in:
- Indoor medium-voltage switchgear
- Ring main units and metal-enclosed distribution panels
- Power distribution substations
- Industrial control and protection systems
- Energy metering and voltage monitoring circuits
Technical Highlights
- Product type: Three-phase voltage transformer / potential transformer / VT / PT
- Model: JSZX18-6R, JSZX18-10R
- Installation: Indoor
- Insulation type: Epoxy cast-resin
- Primary protection: Built-in fuse
- System frequency: 50Hz / 60Hz
- Ambient temperature: -5C to +40C
- Reference standard: IEC 61869-3
International Voltage Class Presentation
For international and export websites, it is recommended to present this series by voltage class rather than only the domestic model suffix:
- JSZX18-6R -> 7.2kV class voltage transformer, commonly used in 6kV or 6.6kV systems
- JSZX18-10R -> 12kV class voltage transformer, commonly used in 10kV or 11kV systems
Technical Data
The following specification format is optimized for international readers and search engines. Exact secondary combinations can be customized according to metering and protection requirements.
| Model | Voltage
Class |
Typical
Voltage Ratio |
Rated
Insulation Level (kV) |
Typical
Accuracy Class / Output |
Max.
Output (VA) |
|---|---|---|---|---|---|
| JSZX18-6R | 7.2kV class | 6kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 6.6kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 |
7.2 / 32 / 60 | 3 x 0.2/3P – 15/100 3 x 0.2/6P – 15/100 3 x 0.5/3P – 30/100 |
3 x 400 |
| JSZX18-10R | 12kV class | 10kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 11kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 |
12 / 42 / 75 | 3 x 0.5/3P – 30/100 3 x 0.5/6P – 30/100 3 x 1.0/3P – 60/100 |
3 x 630 |
| JSZX18-6R Residual-voltage version |
7.2kV class | 6kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 / 100V/3 6.6kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 / 100V/3 |
7.2 / 32 / 60 | 3 x 0.2/0.5/3P – 10/10/100 3 x 0.2/0.5/6P – 10/15/100 |
3 x 400 |
| JSZX18-10R Residual-voltage version |
12kV class | 10kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 / 100V/3 11kV/sqrt3 / 100V/sqrt3 / 100V/sqrt3 / 100V/3 |
12 / 42 / 75 | 3 x 0.2/0.5/3P – 10/10/100 3 x 0.2/0.5/6P – 10/15/100 |
3 x 630 |
Construction and Design
The JSZX18 series uses a cast-resin insulated body with three phase units mounted on a common baseplate. The primary side is fuse-protected, which helps improve equipment safety and provides a compact, factory-integrated solution for switchgear manufacturers. The epoxy cast construction offers good insulation stability, mechanical strength, and resistance to moisture and normal indoor environmental conditions.
Wiring Options
According to the original drawing, this series is available with different secondary arrangements, including:
- Y/Delta connection (three-winding type)
- Y/Y/Delta connection (four-winding type)
This makes the series suitable for metering, protection, and residual voltage detection in medium-voltage systems.
Selection Notes
- Select JSZX18-6R for 6kV / 6.6kV systems.
- Select JSZX18-10R for 10kV / 11kV systems.
- Confirm whether you need a standard metering/protection secondary or a residual-voltage / open-delta secondary.
- Confirm the required accuracy class, rated burden, and maximum output.
- For export pages, use Voltage Transformer, Potential Transformer, VT, and PT as equivalent keywords.
FAQ
What is JSZX18-6R / 10R used for?
It is used for voltage measurement, power metering, monitoring, and relay protection in medium-voltage indoor switchgear.
Is this a fused voltage transformer?
Yes. The primary side includes built-in fuse protection, which improves safety and makes the transformer more convenient for switchgear integration.
Is JSZX18 a VT or a PT?
Both terms are correct. VT stands for Voltage Transformer, and PT stands for Potential Transformer. In product searches, both keywords are commonly used.
What voltage classes are available?
This series is typically presented internationally as 7.2kV class and 12kV class, covering common 6kV, 6.6kV, 10kV, and 11kV systems.
Can this model provide residual voltage output?
Yes. Selected versions can be supplied with residual-voltage or open-delta secondary output for monitoring and protection functions.
Is this a high-frequency transformer?
No. This is a power-frequency medium-voltage voltage transformer for 50Hz / 60Hz systems, not a high-frequency electronic transformer.