Product Overview
JDZ8-3/6/10R/190 is an indoor epoxy cast-resin voltage transformer with primary fuse protection. It is designed for medium-voltage switchgear applications where the available installation space is limited but reliable secondary voltage output is still required for voltage measurement, energy metering, monitoring and relay protection.
Compared with the JDZ10 fused voltage transformer, the JDZ8-3/6/10R/190 series is better positioned as a compact cabinet-oriented VT/PT. The “190” structure code corresponds to a narrower body and more compact outline, making this product suitable for switchgear designs where panel depth, front width or phase arrangement space must be carefully controlled.
Product Display
Application Position
The JDZ8-3/6/10R/190 transformer is normally installed inside indoor air-insulated switchgear, metering cabinets or protection panels. The high-voltage side is connected through the fused primary terminals, while the secondary terminals provide standardized voltage output for meters, relays and control devices.
Main Applications
- Indoor 3kV, 6kV and 10kV medium-voltage power systems
- 3.6kV, 7.2kV and 12kV class switchgear applications
- Voltage indication and monitoring circuits
- Energy metering systems
- Relay protection voltage input circuits
- Compact switchgear panels requiring a fused VT with reduced body width
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZ8-3R / JDZ8-6R / JDZ8-10R / JDZ8-10R/190 |
| Product type | Indoor voltage transformer / potential transformer |
| Insulation structure | Indoor epoxy cast-resin insulation |
| Primary protection | With primary fuse |
| Installation | Indoor switchgear installation |
| System voltage | 3kV, 6kV and 10kV systems |
| International voltage class | 3.6kV, 7.2kV and 12kV classes |
| Rated frequency | 50Hz / 60Hz |
| Ambient temperature | -5°C to +40°C |
| Secondary configurations | Single-secondary and dual-secondary voltage output versions |
| Typical function | Voltage measurement, energy metering, monitoring and relay protection |
| Approximate weight | 37.5kg |
| Standards | GB20840.2-2014, IEC61869-2:2012 and project-specific requirements |
Application Fit
Suitable For
- Indoor switchgear requiring compact VT installation space
- 3kV, 6kV and 10kV medium-voltage systems
- Projects requiring built-in fuse protection on the primary side
- Metering and monitoring circuits using 0.1kV secondary voltage
- Protection schemes requiring 0.2 / 0.5 / 1.0 accuracy combinations
- Switchgear manufacturers seeking a narrower-body alternative to larger fused VTs
Not Recommended For
- Outdoor exposed installations without an enclosure
- Oil-immersed voltage transformer applications
- High-frequency electronic transformer applications
- Applications requiring very high secondary burden beyond the listed thermal limiting output
- Cabinets where the fuse location cannot be accessed for inspection or replacement
Installation Conditions
- Installation location: indoor switchgear or protected indoor cabinet
- Rated frequency: 50Hz / 60Hz power-frequency AC system
- Ambient temperature: -5°C to +40°C
- Atmosphere: no severe corrosive gas, conductive dust or abnormal pollution accumulation
- Fuse access: primary fuse position should remain accessible for inspection
- Maintenance: keep resin surface clean and verify terminal fastening during routine inspection
Technical Structure
The JDZ8-3/6/10R/190 series uses a cast-resin enclosed body with fused primary terminals and low-voltage secondary terminal access. The structure is intended for compact indoor switchgear applications where insulation reliability and space control are equally important.
| Component | Description |
|---|---|
| Primary fuse | Provides primary-side short-circuit protection and improves switchgear safety design |
| Primary winding | Designed for 3kV, 6kV or 10kV system voltage according to model selection |
| Secondary winding | Provides 0.1kV or dual 0.1/0.1kV secondary voltage outputs depending on configuration |
| Epoxy cast-resin body | Provides insulation, moisture resistance and mechanical protection |
| Secondary terminal area | Designed for convenient wiring and terminal identification inside panels |
| Mounting base | Metal base with mounting holes for fixed installation inside switchgear |
Model Designation
- J = Voltage transformer
- D = Single-phase structure
- Z = Epoxy cast-resin insulation
- 8 = Design sequence / structure series code
- 3 / 6 / 10 = Rated system voltage code for 3kV, 6kV or 10kV applications
- R = With primary fuse
- 190 = Structure / outline size code for the compact-width version
Technical Data
The following table is reorganized from the JDZ8-3/6/10R/190 sample data. For international product pages, the domestic 3kV / 6kV / 10kV model codes should be matched with 3.6kV / 7.2kV / 12kV insulation classes.
| Model | Rated
Voltage Ratio |
Rated
Insulation Level |
Accuracy Class
/ Rated Output |
Thermal
Limiting Output |
|---|---|---|---|---|
| JDZ8-3R | 3 / 0.1 | 3.6 / 25 / 40kV | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
400VA |
| JDZ8-6R | 6 / 0.1 | 7.2 / 32 / 60kV | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
|
| JDZ8-10R | 10 / 0.1 | 12 / 42 / 75kV | 0.2 — 30VA 0.5 — 80VA 1.0 — 150VA |
|
| JDZ8-3R | 3 / 0.1 / 0.1 | 3.6 / 25 / 40kV | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
300VA |
| JDZ8-6R | 6 / 0.1 / 0.1 | 7.2 / 32 / 60kV | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
|
| JDZ8-10R | 10 / 0.1 / 0.1 | 12 / 42 / 75kV | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 20VA 0.5 / 0.5 — 30 / 30VA |
Technical notes:
- One transformer is supplied with one selected accuracy class and rated output combination.
- Single-secondary versions provide one 0.1kV secondary output for measurement or protection.
- Dual-secondary versions provide 0.1/0.1kV outputs for separated metering and protection functions.
- If the user’s data exceeds the listed scope, parameters should be confirmed by agreement between manufacturer and purchaser.
Installation and Dimensions
Dimension and Weight Reference
| Item | Reference Value |
|---|---|
| Overall length | 390mm |
| Base length | 350mm |
| Main body width | 190mm |
| Front height reference | 261mm |
| Overall height | 300 ±5mm |
| Top terminal spacing | 202mm reference |
| Primary terminal bolt | 2-M10 |
| Secondary terminal fixing | 4-M6 |
| Approximate weight | 37.5kg |
Terminal and Wiring Notes
- The primary terminals are marked as A and B.
- Secondary terminals are marked according to the selected secondary configuration, such as 1a, 1b, 2a and 2b.
- The sample drawing shows single-phase wiring and three-phase wiring arrangements.
- For three-phase applications, three single-phase units can be arranged according to the switchgear wiring design.
- Confirm grounding, terminal polarity and fuse access before commissioning.
Compliance and Testing
The sample documentation references GB20840.2-2014 and IEC61869-2:2012. For voltage transformer projects, the final standard reference should be checked against the purchase specification and project requirements.
Typical Routine Tests
- Visual inspection and nameplate verification
- Ratio verification
- Polarity and terminal marking check
- Accuracy test at rated burden
- Insulation resistance test
- Power-frequency withstand voltage test according to insulation class
- Fuse and primary circuit inspection
- Secondary terminal and grounding inspection
Engineering Notes
- Use JDZ8-3R for 3kV systems, JDZ8-6R for 6kV systems and JDZ8-10R for 10kV systems.
- For export pages, express the products as 3.6kV class, 7.2kV class and 12kV class according to insulation level.
- The JDZ8-190 version is a better fit for projects where cabinet width is more constrained than in larger JDZ10-type installations.
- Do not describe this product as a high-frequency transformer. It is a 50Hz / 60Hz power-frequency VT/PT.
- For three-phase applications, confirm whether the project requires one unit, two units in V connection or three single-phase units.
Selection Guide
Select by switchgear space: Choose JDZ8-3/6/10R/190 when the project requires a fused indoor VT with a more compact body than larger pillar-type voltage transformers. The 190mm width and 37.5kg weight should be checked against panel layout limits.
Select by voltage class: Use JDZ8-3R for 3kV systems, JDZ8-6R for 6kV systems and JDZ8-10R for 10kV systems. For international specifications, list them as 3.6kV, 7.2kV and 12kV class products.
Select by secondary configuration: Use a single-secondary version for standard measurement or indication. Use a dual-secondary version when metering and protection circuits need separate secondary outputs.
Select by burden and accuracy: The single-secondary version supports 0.2, 0.5 and 1.0 accuracy classes with rated outputs up to 150VA. The dual-secondary version is suitable for combined metering/protection output such as 15/15VA, 15/20VA or 30/30VA.
Select by buyer inquiry clarity: For international procurement, specify the model, primary voltage, secondary voltage, accuracy class, rated output, insulation level, quantity and whether the transformer will be used as a single-phase unit or a three-phase group.