Product Overview
JDZX10-3/6/10A/150 (REL10) is an indoor epoxy cast-resin grounded voltage transformer for medium-voltage switchgear. It is used in 50Hz / 60Hz AC systems to provide secondary voltage signals for voltage measurement, electric energy metering, residual-voltage monitoring and relay protection.
This model belongs to the same grounded JDZX10 voltage transformer family as the larger JDZX10-10B/180 type, but it should be positioned differently. The JDZX10-3/6/10A/150 (REL10) is a compact REL10-style 150mm structure with lower weight and smaller cabinet footprint. It is suitable when the project requires a grounded VT/PT with 100/√3V metering output and 100/3V residual-voltage output, but the available cabinet space is limited.
Product Display
Application Position
JDZX10-3/6/10A/150 is installed inside indoor medium-voltage switchgear, metering panels or voltage transformer compartments. The primary winding is connected in a phase-to-neutral or grounded-voltage scheme, while the secondary terminals supply metering voltage and residual-voltage signals to meters, monitoring devices and protection relays.
Main Applications
- Indoor 3kV, 6kV and 10kV medium-voltage switchgear
- 3.6kV, 7.2kV and 12kV class distribution cabinets
- Phase-to-neutral voltage measurement
- Electric energy metering and voltage monitoring
- Residual-voltage and open-delta protection circuits
- Relay protection voltage input circuits
- Compact cabinet installations requiring REL10-style VT dimensions
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZX10-3A/150 / JDZX10-6A/150 / JDZX10-10A/150 |
| Related type | REL10 application family |
| Product type | Indoor grounded voltage transformer / potential transformer |
| Insulation structure | Indoor epoxy cast-resin insulation |
| 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 | -25°C to +40°C |
| Typical voltage ratio | 3/√3, 6/√3 or 10/√3 primary with 0.1/√3 and 0.1/3 secondary output |
| Max. output | 350VA |
| Approximate weight | 19.7kg |
| Standards | GB20840.3-2013, IEC61869-3:2011 and project-specific requirements |
Application Fit
Suitable For
- Compact indoor switchgear requiring grounded VT/PT installation
- 3kV, 6kV and 10kV systems requiring phase-to-neutral voltage measurement
- 12kV class cabinets where a smaller VT body is preferred over the 180mm structure
- Metering circuits requiring 0.1/√3kV secondary output
- Protection circuits requiring 0.1/3kV residual-voltage output
- Projects requiring REL10-compatible voltage transformer layout
Not Recommended For
- Outdoor exposed installation without enclosure protection
- Line-voltage applications requiring 10/0.1kV output only
- Applications requiring 0.22kV auxiliary power output
- High-frequency electronic transformer applications
- Oil-immersed voltage transformer applications
- Large handcart-type three-phase VT applications
Installation Conditions
- Installation location: indoor air-insulated switchgear or protected indoor cabinet
- Rated frequency: 50Hz / 60Hz power-frequency AC system
- Ambient temperature: -25°C to +40°C
- Electrical clearance: confirm primary terminal clearance and cabinet insulation distance before installation
- Grounding: confirm neutral reference and grounding connection before commissioning
- Maintenance: inspect resin body, terminal fastening and grounding point during routine service
Technical Structure
The JDZX10-3/6/10A/150 series uses an epoxy cast-resin body with compact single-phase grounded VT construction. The product is designed for a smaller cabinet footprint than the 180mm type while still supporting metering and residual-voltage protection output.
| Component | Description |
|---|---|
| Epoxy cast-resin body | Compact indoor insulation structure with mechanical strength and moisture resistance |
| Primary winding | Designed for 3/√3kV, 6/√3kV or 10/√3kV phase-to-neutral primary voltage |
| Metering secondary | Provides 0.1/√3kV output for meters and voltage monitoring devices |
| Protection secondary | Provides 3P or 6P class output for relay protection circuits |
| Residual-voltage output | Provides 0.1/3kV output for open-delta or residual-voltage monitoring |
| Secondary terminal box | Front terminal area for metering and protection wiring |
| Mounting base | Compact base suitable for REL10-style cabinet arrangement |
Model Designation
- J = Voltage transformer
- D = Single-phase voltage transformer structure
- Z = Epoxy cast-resin insulation
- X = Grounded voltage transformer / residual-voltage related secondary function code
- 10 = Design sequence or product series code
- 3 / 6 / 10 = Rated system voltage code for 3kV, 6kV or 10kV applications
- A = Compact structure or configuration code
- 150 = REL10-style structure / outline size code
Technical Data
The following data is organized from the JDZX10-3/6/10A/150 (REL10) sample. For international product pages, the 3kV, 6kV and 10kV versions should be expressed as 3.6kV, 7.2kV and 12kV insulation classes.
| Model | Rated
Voltage Ratio |
Accuracy Class /
Rated Output |
Max.
Output |
Rated
Insulation Level |
|---|---|---|---|---|
| JDZX10-3A/150 | 3/√3 : 0.1/√3 : 0.1/3 | 0.2/6P — 15/50VA 0.2/3P — 15/50VA 0.5/6P — 30/50VA 0.5/3P — 30/50VA 1.0/6P — 60/50VA 1.0/3P — 60/50VA 3.0/6P — 200/50VA 3.0/3P — 200/50VA |
350VA | 3.6/25/40kV |
| JDZX10-6A/150 | 6/√3 : 0.1/√3 : 0.1/3 | 7.2/30/60kV | ||
| JDZX10-10A/150 | 10/√3 : 0.1/√3 : 0.1/3 | 12/42/75kV |
Technical notes:
- One transformer is supplied with one selected accuracy class and corresponding rated output combination.
- The 0.1/√3kV output is normally used for voltage measurement, metering and monitoring.
- The 0.1/3kV output is normally used for residual-voltage or open-delta protection circuits.
- The 150 structure is more compact than the 180 structure, while the sample max. output is 350VA.
- If required parameters exceed the listed scope, parameters should be confirmed by agreement between manufacturer and purchaser.
Installation and Dimensions
Dimension Reference
| Item | Reference Value |
|---|---|
| Overall base length | 325mm |
| Main mounting length | 290mm reference |
| Body length reference | 232 ±2mm |
| Base width | 150mm |
| Body width reference | 100mm |
| Overall height | 213mm reference |
| Body height reference | 200mm |
| Primary terminal bolt | M8 reference |
| Secondary terminal section | Front terminal box with multiple terminal positions |
| Approximate weight | 19.7kg |
Terminal and Wiring
- The sample wiring diagram shows grounded VT connection with residual-voltage output.
- Primary terminals are connected according to phase-to-neutral voltage transformer wiring.
- Secondary terminals may include a, b, c, n, da and dn depending on the wiring arrangement.
- Residual-voltage terminals should be connected according to the relay protection scheme.
- Terminal polarity, grounding and cabinet clearance must be checked before commissioning.
Compliance and Testing
The product information references GB20840.3-2013 and IEC61869-3:2011. For export projects, the final standard reference should be aligned with the buyer’s technical specification, applicable grid requirements and approved test plan.
Typical Routine Tests
- Visual inspection and nameplate verification
- Ratio verification
- Polarity and terminal marking check
- Accuracy test at specified rated burden
- Power-frequency withstand voltage test
- Induced withstand voltage test where applicable
- Insulation resistance test
- Residual-voltage winding verification
- Secondary terminal and grounding inspection
Engineering Notes
- Use JDZX10-3A/150 for 3kV systems, JDZX10-6A/150 for 6kV systems and JDZX10-10A/150 for 10kV systems.
- For export pages, describe these models as 3.6kV, 7.2kV and 12kV class products according to insulation level.
- Compared with JDZX10-10B/180, this 150 structure is smaller and lighter, with approx. 19.7kg weight.
- Use this model when the project needs 0.1/√3 metering output and 0.1/3 residual-voltage output in a compact space.
- Use JDZ10 line-voltage products instead if the required ratio is 10/0.1kV or 10/0.1/0.22kV.
- Do not describe this product as a high-frequency transformer; it is a 50Hz / 60Hz power-frequency VT/PT.
Selection Guide
Select by voltage class: Choose JDZX10-3A/150 for 3kV systems, JDZX10-6A/150 for 6kV systems and JDZX10-10A/150 for 10kV systems. Use 3.6kV, 7.2kV and 12kV class wording for international pages.
Select by cabinet space: Choose the 150 structure when the switchgear requires a lighter and more compact VT than the 180 structure. The sample weight is approximately 19.7kg.
Select by output function: Use 0.1/√3kV output for metering and monitoring. Use 0.1/3kV output for residual-voltage or open-delta protection functions.
Select by protection class: Use 3P or 6P output according to the relay protection requirement. Confirm the rated burden in VA before ordering.
Select by inquiry clarity: A clear inquiry should state model, voltage ratio, accuracy class, protection class, rated burden, insulation level, terminal arrangement and quantity.