Product Overview
JDZX10-6, JDZX10-10B1, JDZX10-12A and JDZX10-12B are indoor single-phase epoxy cast-resin voltage transformers used in medium-voltage AC systems for voltage measurement, electric energy metering and protective relaying. The series is suitable for 50Hz / 60Hz switchgear applications and can be selected for 6kV, 10kV and 11kV system voltage requirements.
The product adopts a fully enclosed epoxy resin casting structure with low magnetic flux density and large external creepage distance. This design improves insulation stability, moisture resistance and long-term reliability inside indoor medium-voltage switchgear. JDZX10-12A and JDZX10-12B are especially useful for 12kV class switchgear requiring 11/√3kV primary voltage and metering/protection secondary output combinations.
Product Display
Application Position
The JDZX10 series is installed in indoor switchgear, metering cabinets and voltage transformer compartments. The primary side is connected to the medium-voltage circuit, while the secondary side supplies standardized voltage signals to energy meters, voltage meters, monitoring devices and relay protection equipment.
Main Applications
- Indoor 6kV, 10kV and 11kV medium-voltage switchgear
- 7.2kV and 12kV class distribution systems
- Voltage measurement and voltage indication
- Electric energy metering and revenue metering circuits
- Relay protection voltage input circuits
- Single-phase VT installation or three-phase groups formed by multiple single-phase units
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZX10-6 / JDZX10-10B1 / JDZX10-12A / JDZX10-12B |
| Equivalent / related type | Same application family as REL-10 type indoor VT |
| Product type | Indoor single-phase voltage transformer / potential transformer |
| Insulation structure | Fully enclosed epoxy cast-resin insulation |
| Installation | Indoor switchgear installation |
| System voltage | 6kV, 10kV and 11kV systems |
| International voltage class | 7.2kV and 12kV classes |
| Rated frequency | 50Hz / 60Hz |
| Load power factor | cosφ = 0.8 lagging |
| Highest voltage for equipment | 12kV for JDZX10-12A / JDZX10-12B |
| Typical secondary voltage | 0.1/√3kV and 0.11/3kV configurations |
| Typical function | Metering, voltage monitoring and relay protection |
| Standards | IEC60044-2, GB20840.3-2013, IEC61869-3:2011 and project-specific requirements |
Application Fit
Suitable For
- Indoor medium-voltage switchgear requiring single-phase cast-resin VT/PT units
- 6kV systems using 7.2kV insulation class
- 10kV and 11kV systems using 12kV insulation class
- Metering circuits requiring 0.2 or 0.5 accuracy class
- Protection circuits requiring 3P or 6P accuracy output
- Projects requiring reliable resin-insulated VT construction with low maintenance
Not Recommended For
- Outdoor exposed installation without enclosure protection
- High-frequency electronic transformer applications
- Oil-immersed voltage transformer applications
- Three-phase integrated handcart VT applications where a JSZY-type product is required
- Special voltage ratios or output burdens outside the table without technical confirmation
Installation Conditions
- Installation site: indoor switchgear or protected indoor electrical cabinet
- Rated frequency: 50Hz / 60Hz power-frequency AC system
- Load power factor: cosφ = 0.8 lagging
- Ambient condition: clean indoor switchgear environment without severe conductive dust or corrosive gas
- Electrical clearance: confirm primary terminal clearance and insulation distance according to the switchgear design
- Maintenance: inspect terminal fastening, grounding point and resin surface condition during scheduled service
Technical Structure
The JDZX10 series uses a fully enclosed epoxy resin casting structure. The primary winding, secondary winding and iron core are encapsulated in resin to improve dielectric strength, pollution resistance and moisture resistance. The design is intended for reliable indoor switchgear service without frequent maintenance.
| Component | Description |
|---|---|
| Epoxy cast-resin body | Fully enclosed insulation structure for indoor medium-voltage switchgear |
| Low magnetic flux density core | Supports stable operation and reduces saturation risk in rated service |
| Primary winding | Designed for 6kV, 10kV or 11/√3kV primary voltage according to model |
| Metering secondary | Provides standardized secondary voltage for meters and measuring instruments |
| Protection secondary | Supports 3P or 6P output options for protective relaying |
| External insulation surface | Large creepage distance for improved insulation reliability inside switchgear |
| Terminal section | Secondary terminal area for metering, protection and grounding connections |
Model Designation
- J = Voltage transformer
- D = Single-phase / monophase voltage transformer
- Z = Epoxy resin casting insulation
- X = Grounded voltage transformer / residual-voltage related configuration code
- 10 = Design sequence or structure series code
- 6 / 10 / 12 = Rated voltage or voltage class code
- B1 = Structure or configuration code for the JDZX10-10B1 type
- 12A / 12B = 12kV class versions with different rated output and thermal limiting current combinations
Technical Data
The following technical data combines the JDZX10-3/6/10B1/160L sample and the JDZX10-12A / JDZX10-12B specification. For international product pages, the 6kV version should be written as 7.2kV class, while 10kV / 11kV versions should be written as 12kV class.
| Model | Rated
Voltage Ratio |
Rated
Insulation Level |
Accuracy Class /
Rated Output |
Max.
Output |
|---|---|---|---|---|
| JDZX10-6B1/160L | 6/√3 : 0.1/√3 : 0.1/3 | 7.2/30/60kV | 0.2/6P—30/50 0.2/3P—30/50 0.5/6P—50/50 0.5/3P—50/50 1.0/6P—100/50 1.0/3P—100/50 3.0/6P—200/50 3.0/3P—200/50 |
500VA |
| JDZX10-10B1/160L | 10/√3 : 0.1/√3 : 0.1/3 | 12/42/75kV | ||
| JDZX10-6B1/160L | 6/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 7.2/30/60kV | 0.2/0.5/6P—10/15/50 0.2/0.5/3P—10/15/50 |
|
| JDZX10-10B1/160L | 10/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 12/42/75kV |
Technical notes:
- One transformer is supplied with one selected accuracy class and rated output combination.
- JDZX10-12A and JDZX10-12B are 12kV indoor single-phase epoxy resin VTs with 11/√3kV primary voltage.
- JDZX10-12B provides higher rated output and thermal limiting current than JDZX10-12A.
- The 0.11/3kV or 0.1/3kV secondary output is typically used for residual-voltage or open-delta protection functions.
- If required parameters exceed the table range, confirmation should be made between manufacturer and purchaser.
Installation and Dimensions
Dimension and Weight Reference
| Item | Reference Value |
|---|---|
| JDZX10-10B1/160L base length | 360 ±2mm |
| JDZX10-10B1/160L base width | 160 ±1mm |
| JDZX10-10B1/160L overall height | 265 ±2mm |
| JDZX10-10B1/160L approximate weight | 30kg |
| Primary terminal | M10 reference |
| Secondary terminal section | Front terminal box with multiple terminal positions |
| Final dimensions | Subject to approved model drawing and nameplate |
Terminal and Wiring Notes
- Grounded-type JDZX voltage transformers normally use phase-to-neutral primary voltage ratios such as 10/√3 or 11/√3.
- Secondary terminals may include metering output and residual-voltage / protection output terminals.
- Residual-voltage terminals should be connected according to the relay protection scheme.
- Confirm primary terminal direction, secondary polarity and grounding before commissioning.
- For three-phase systems, the project may use multiple single-phase units according to the wiring diagram.
Compliance and Testing
The supplied information references IEC60044-2, GB20840.3-2013 and IEC61869-3:2011. For export projects, the final compliance statement should be aligned with the buyer’s technical specification, local grid requirement 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
- Secondary terminal and grounding inspection
- Residual-voltage winding verification when supplied
Engineering Notes
- Use JDZX10-6 for 6kV systems and JDZX10-10B1 for 10kV systems.
- Use JDZX10-12A or JDZX10-12B when the project specifies 11/√3kV primary voltage and 12kV class equipment.
- JDZX10-12B is more suitable when higher rated output or thermal limiting current is required.
- For export pages, express the series as 7.2kV and 12kV class according to insulation level.
- Do not describe this product as a high-frequency transformer; it is a 50Hz / 60Hz power-frequency VT/PT.
- Confirm whether 3P or 6P protection class is required before final model selection.
Selection Guide
Select by system voltage: Choose JDZX10-6 for 6kV systems, JDZX10-10B1 for 10kV systems and JDZX10-12A / 12B for 11kV systems using 12kV class switchgear.
Select by rated output: Choose JDZX10-12A for moderate burden requirements. Choose JDZX10-12B when the metering or protection circuit requires higher rated output or higher thermal limiting current.
Select by secondary configuration: Use 0.1/√3 or 0.11/√3 output for metering and voltage monitoring. Use 0.1/3 or 0.11/3 output for residual-voltage or open-delta protection functions.
Select by accuracy requirement: Use 0.2 or 0.5 class for metering. Use 3P or 6P accuracy class for protective relaying. Confirm burden in VA before ordering.
Select by international inquiry clarity: A clear inquiry should state model, system voltage, primary voltage, secondary voltage, accuracy class, rated output, protection class, thermal limiting current requirement, insulation level and quantity.