Product Overview
The JDZ11-3/6/10A and JDZX11-3/6/10G indoor epoxy cast-resin voltage transformers are medium-voltage voltage transformers designed for 3kV, 6kV and 10kV AC power systems. They convert primary system voltage into standardized secondary voltage signals for voltage measurement, energy metering, monitoring instruments and relay protection circuits.
The JDZ11-A models are commonly used for phase-to-phase voltage measurement, while the JDZX11-G models are used for phase-to-ground voltage measurement and can provide residual-voltage / protection secondary winding options. The epoxy cast-resin insulation structure is suitable for indoor switchgear, metering cabinets, distribution rooms and medium-voltage electrical equipment.
Application Position
These voltage transformers are normally installed in indoor medium-voltage switchgear or metering panels. They provide secondary voltage signals to meters, protection relays, monitoring devices, voltage indicators and control systems.
Main Applications
- 3kV, 6kV and 10kV indoor medium-voltage power systems
- Voltage measurement and voltage indication circuits
- Energy metering and power monitoring systems
- Relay protection voltage input circuits
- Residual-voltage detection and grounding fault monitoring circuits
- Indoor switchgear, distribution cabinets and metering panels
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZ11-3A / JDZ11-6A / JDZ11-10A; JDZX11-3G / JDZX11-6G / JDZX11-10G |
| Product type | Indoor voltage transformer / potential transformer |
| Insulation structure | Epoxy cast-resin insulation |
| Installation | Indoor |
| Rated voltage class | 3kV, 6kV and 10kV |
| Rated frequency | 50Hz or 60Hz |
| Secondary voltage | 100V or specified secondary winding arrangement according to model |
| Accuracy class | 0.2, 0.5, 1, 0.2/0.2, 0.2/0.5, 0.2/6P, 0.5/6P, 1/6P |
| Rated output | According to model, accuracy class and secondary winding configuration |
| Main function | Voltage metering, monitoring, residual-voltage signal output and relay protection |
Product Display
Application Fit
Suitable For
- Indoor 3kV, 6kV and 10kV medium-voltage switchgear
- Voltage metering circuits requiring high accuracy secondary output
- Protection circuits requiring metering/protection combined accuracy classes
- Phase-to-phase voltage measurement using JDZ11-A models
- Phase-to-ground and residual-voltage measurement using JDZX11-G models
- Projects requiring compact epoxy cast-resin insulation instead of oil-immersed structure
Not Recommended For
- Outdoor exposed installation without a suitable enclosure
- Systems above the specified rated insulation level
- Applications requiring oil-immersed voltage transformer construction
- Special secondary voltage ratios, connection groups or protection classes without technical confirmation
Technical Structure
| Component | Description |
|---|---|
| Core and winding | Electromagnetic voltage transformation structure with primary and secondary windings |
| Insulation | Indoor epoxy cast-resin insulation for compact medium-voltage installation |
| Primary terminal | Top primary terminal for medium-voltage connection |
| Secondary terminal box | Low-voltage terminal box for secondary output connection |
| Mounting base | Metal baseplate with fixing holes for cabinet installation |
| Residual-voltage winding | Available on JDZX11-G models according to secondary winding configuration |
Model Designation
The JDZ11 and JDZX11 model codes can be interpreted as follows:
| Code | Meaning |
|---|---|
| J | Voltage transformer |
| D | Single-phase voltage transformer structure |
| Z | Epoxy cast-resin insulation |
| X | Residual-voltage / grounding-related winding structure, used in JDZX models |
| 11 | Design series code |
| 3 / 6 / 10 | Rated voltage class: 3kV, 6kV or 10kV |
| A / G | Model variant code according to voltage ratio and winding configuration |
| /185 | Structure or installation size code for the 185 series variant |
Technical Data
The following table combines the specification data for JDZ11-A and JDZX11-G series models. Final values should be confirmed according to the approved drawing, technical agreement and nameplate data.
| Type | Rated
Frequency (Hz) |
Rated
Voltage Ratio |
Accuracy
Class |
Rated
Output (VA) |
Limit
Output (VA) |
Rated
Insulating Level (kV) |
Remark |
|---|---|---|---|---|---|---|---|
| JDZ11-3A | 50 / 60 | 3/0.1; 3/0.1/0.1 | 0.2, 0.5, 1, 0.2/0.2, 0.2/0.5 | 30, 80, 150, 20/20, 20/30 | 400 | 3.6/25/40 | With UNZ 10 |
| JDZ11-6A | 6/0.1; 3/0.1/0.1 | 7.2/30/60 | |||||
| JDZ11-10A | 10/0.1; 3/0.1/0.1 | 12/45/75 | |||||
| JDZX11-3G | 3/√3/0.1/√3/0.1/3 | 0.2/6P, 0.5/6P, 1/6P | 20/100, 40/100, 50/100 | 300 | 3.6/25/40 | – | |
| JDZX11-6G | 6/√3/0.1/√3/0.1/3 | 7.2/30/60 | |||||
| JDZX11-10G | 10/√3/0.1/√3/0.1/3 | 12/42/75 | |||||
| JDZX11-10G | 10/√3/0.1/√3/0.1/√3/0.1/3 | 0.2/0.5/6P | 20/40/100 |
JDZX11-6GA/185 and JDZX11-10GA/185 Technical Reference
The following table is based on the provided JDZX11-6GA/185 and JDZX11-10GA/185 technical data. Each voltage transformer is supplied with one selected accuracy class and the corresponding rated output combination.
| Type | Rated
Voltage |
Insulation
Level (kV) |
Accuracy Class
& Rated Output |
Max.
Output (VA) |
|---|---|---|---|---|
| JDZX11-6GA/185 | 6/√3:0.1/√3:0.1/3 | 7.2/32/60 | 0.2/3P—50/100 0.2/6P—50/100 0.5/3P—150/100 0.5/6P—150/100 1.0/6P—300/100 |
800 |
| 6/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P—20/40/100 0.2/0.5/6P—20/40/100 0.2/0.5/3P—30/30/100 0.2/0.5/6P—30/30/100 |
800 | ||
| JDZX11-10GA/185 | 10/√3:0.1/√3:0.1/3 | 10/42/75 | 0.2/3P—50/100 0.2/6P—50/100 0.5/3P—150/100 0.5/6P—150/100 1.0/6P—300/100 |
800 |
| 10/√3:0.1/√3:0.1/√3:0.1/3 | 0.2/0.5/3P—20/40/100 0.2/0.5/6P—20/40/100 0.2/0.5/3P—30/30/100 0.2/0.5/6P—30/30/100 |
800 |
Technical notes:
- One voltage transformer can only be supplied with one selected accuracy class and corresponding rated output combination.
- If the required parameter exceeds the listed range, it should be confirmed by agreement between manufacturer and purchaser.
- Rated frequency: 50Hz or 60Hz.
- Ambient temperature: -25°C to +40°C.
Installation and Dimensions
The JDZ11 and JDZX11 series should be installed according to the approved outline drawing, wiring diagram and switchgear layout. The /185 structure variant has a compact base-mounted structure with a secondary terminal box and top primary terminal.
JDZX11-6GA/185 and JDZX11-10GA/185 Dimension Reference
| Item | Dimension / Specification |
|---|---|
| Overall length | 363 ±1 mm |
| Main body width | 300 mm |
| Base width | 185 mm |
| Overall height | 280 ±2 mm |
| Bottom fixing length | 330 mm |
| Mounting reference length | 310 mm |
| Approximate weight | 42 kg |
Terminal and Wiring Notes
- Primary wiring and secondary wiring should follow the approved wiring diagram.
- For JDZX11-G models, residual-voltage winding terminals should be connected according to the protection scheme.
- Secondary terminal markings must be checked before commissioning.
- The transformer should be firmly fixed to the cabinet base or mounting plate.
- Electrical clearance and creepage distance should comply with the project voltage level and insulation requirements.
Compliance and Testing
The JDZ11 and JDZX11 series are designed according to medium-voltage voltage transformer requirements. The provided sample refers to GB20840.1-2010 and GB20840.3-2013, as well as customer-specific technical requirements. Final compliance requirements should follow the project specification and technical agreement.
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
- Insulation resistance test
- Partial discharge test when required by the project
- Secondary winding and residual-voltage winding verification
Engineering Notes
- Select JDZ11-A or JDZX11-G according to the system connection method and secondary winding requirement.
- Do not exceed the rated output corresponding to the selected accuracy class.
- Confirm whether the circuit requires a residual-voltage winding before selecting JDZX11-G models.
- Verify terminal markings and secondary grounding arrangement before commissioning.
- For special ratios, special accuracy classes or special installation conditions, technical confirmation is required before ordering.
Selection Guide
How to Select JDZ11-A or JDZX11-G
Select JDZ11-A models when the project requires phase-to-phase voltage measurement and standard metering voltage output. Select JDZX11-G models when the circuit requires phase-to-ground voltage measurement, residual-voltage detection or a combined metering/protection secondary winding arrangement.
How to Select the Rated Voltage Ratio
Select the voltage transformer according to the system rated voltage. For a 3kV system, select JDZ11-3A or JDZX11-3G. For a 6kV system, select JDZ11-6A or JDZX11-6G. For a 10kV system, select JDZ11-10A or JDZX11-10G. The primary and secondary voltage ratio should match the system voltage and the input rating of connected meters or relays.
How to Select the Accuracy Class
Use class 0.2 or 0.5 for higher-accuracy metering applications. Class 1 may be used for general voltage measurement or indication. Combined accuracy classes such as 0.2/6P, 0.5/6P and 1/6P are used when one secondary circuit is used for metering and another circuit is used for protection.
How to Confirm Rated Output
The selected rated output should be higher than the total connected secondary burden. The burden includes meters, relays, monitoring devices, terminal devices and wiring loss. The rated output must be checked together with the required accuracy class.
How to Confirm Installation Size
Before ordering, confirm the transformer outline dimensions, base mounting holes, terminal box position, primary terminal direction, secondary terminal arrangement and available clearance inside the switchgear or metering cabinet.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Product model: JDZ11-3A, JDZ11-6A, JDZ11-10A, JDZX11-3G, JDZX11-6G, JDZX11-10G or /185 variant
- Rated voltage ratio and secondary winding configuration
- Rated frequency: 50Hz or 60Hz
- Required accuracy class and rated output
- Rated insulation level
- Residual-voltage winding requirement, if applicable
- Installation dimensions or switchgear layout requirements
- Applicable standard or project specification
- Quantity
- Special requirements for drawings, test reports, certificates, nameplate language, packaging or shipping