Product Overview
The JDZX15-3/6/10R indoor epoxy cast-resin voltage transformer is a dry-type medium-voltage voltage transformer with a built-in fuse structure. It is designed for 3kV, 6kV and 10kV AC power systems and converts primary system voltage into standardized secondary voltage signals for metering, voltage monitoring and relay protection.
The product adopts epoxy cast-resin insulation and is suitable for indoor switchgear, metering panels and medium-voltage distribution equipment. Compared with oil-immersed voltage transformers, this dry-type design is suitable for compact cabinet installation where clean indoor insulation, fixed mounting and integrated fuse protection are required.
Application Position
The JDZX15-3/6/10R voltage transformer is normally installed in the voltage measurement compartment or instrument transformer compartment of indoor medium-voltage switchgear. It provides secondary voltage signals to meters, protection relays, monitoring devices and control systems.
Main Applications
- 3kV, 6kV and 10kV indoor medium-voltage switchgear
- Voltage metering and voltage indication circuits
- Energy metering and power monitoring systems
- Relay protection voltage input circuits
- Residual-voltage and grounding fault monitoring circuits
- Compact switchgear applications requiring a built-in fuse voltage transformer
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZX15-3R / JDZX15-6R / JDZX15-10R |
| Product type | Indoor voltage transformer / potential transformer with fuse |
| Insulation structure | Epoxy cast-resin insulation |
| Installation | Indoor |
| Rated voltage class | 3kV, 6kV and 10kV |
| Rated frequency | 50Hz or 60Hz |
| Ambient temperature | -5°C to +40°C |
| Secondary output | 100V / √3 and residual-voltage winding options according to model |
| Accuracy class | 0.2, 0.5, 1, 3P, 6P and combined metering/protection configurations |
| Max. output | 400VA or 200/200VA depending on winding configuration |
| Standards | GB20840.3-2013, IEC61869-3:2011 and project-specific requirements |
Product Display
Application Fit
Suitable For
- Indoor medium-voltage switchgear rated 3kV, 6kV or 10kV
- Voltage metering circuits requiring epoxy cast-resin insulation
- Protection circuits requiring voltage reference and residual-voltage signals
- Switchgear layouts requiring a built-in primary fuse structure
- Projects where dry-type indoor voltage transformers are preferred over oil-immersed units
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 ratios, special fuse ratings or non-standard protection classes without confirmation
Technical Structure
| Component | Description |
|---|---|
| Insulation body | Epoxy cast-resin insulated dry-type body for indoor medium-voltage use |
| Primary fuse | Built-in fuse structure on the primary side for compact switchgear installation |
| Core and winding | Electromagnetic voltage transformation structure with primary and secondary windings |
| Secondary terminal box | Terminal box for metering, protection and residual-voltage secondary connections |
| Mounting base | Metal baseplate with fixing holes for cabinet installation |
| Grounding point | Grounding terminal provided according to product construction |
Model Designation
The JDZX15-3/6/10R model code 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 |
| 15 | Design series code |
| 3 / 6 / 10 | Rated voltage class: 3kV, 6kV or 10kV |
| R | Fuse-equipped structure / product variant code |
Technical Data
The following technical data is based on the JDZX15-3R, JDZX15-6R and JDZX15-10R product sample. One voltage transformer can only be supplied with one selected accuracy class and corresponding rated secondary output combination.
| Type | Rated
Voltage |
Rated
Insulation Level (kV) |
Accuracy Class
/ Rated Secondary Output |
Max.
Output (VA) |
Fuse
Within Once (A) |
|---|---|---|---|---|---|
| JDZX15-3R | 3000/√3 / 100/√3 / 100/3 | 3.6/23/40 | 0.2/6P(3P)—25/100 0.5/6P(3P)—50/100 1/6P(3P)—90/100 3/6P(3P)—200/100 |
400 | 0.5 |
| JDZX15-6R | 6000/√3 / 100/√3 / 100/3 | 7.2/32/60 | |||
| JDZX15-10R | 10000/√3 / 100/√3 / 100/3 | 12/42/75 | 0.2 | ||
| JDZX15-10R | 10000/√3 / 100/√3 / 100/√3 / 100/3 | 12/42/75 | 0.2/0.2/6P(3P)—15/15/100 0.2/0.5/6P(3P)—15/20/100 0.5/0.5/6P(3P)—30/30/100 |
200/200 |
Technical notes:
- Rated frequency: 50Hz or 60Hz.
- Ambient temperature: -5°C to +40°C.
- The product complies with GB20840.3-2013, IEC61869-3:2011 and special project requirements.
- One voltage transformer can only be supplied with one selected accuracy class and corresponding rated secondary output.
- If the required parameters exceed the listed range, they should be confirmed by agreement between manufacturer and purchaser.
Installation and Dimensions
The JDZX15-3/6/10R series should be installed according to the approved outline drawing, wiring diagram and switchgear layout. The product has a base-mounted cast-resin structure with a built-in fuse section and secondary terminal box.
Overall Dimension Reference
| Item | Dimension / Specification |
|---|---|
| Overall length | 485 mm |
| Main body reference length | 427 mm |
| Base length | 321 mm |
| Mounting reference length | 280 mm |
| Base width | 160 mm |
| Overall height | 273 mm |
| Main body height | 240 mm |
| Approximate weight | 24 kg |
Terminal and Wiring Notes
- Primary wiring and secondary wiring should follow the approved wiring diagram.
- 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.
- The built-in fuse rating should be confirmed according to the selected model and project requirements.
Compliance and Testing
The JDZX15-3/6/10R series is designed according to indoor medium-voltage voltage transformer requirements. The provided product sample refers to GB20840.3-2013 and IEC61869-3:2011, together with customer-specific technical requirements.
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
- Fuse and primary circuit inspection
- Secondary winding and residual-voltage winding verification
Engineering Notes
- Select the model according to rated system voltage: JDZX15-3R, JDZX15-6R or JDZX15-10R.
- Confirm whether the circuit requires one metering winding, protection winding or multiple secondary windings.
- Do not exceed the rated secondary output corresponding to the selected accuracy class.
- Confirm fuse rating, primary connection and secondary terminal arrangement before installation.
- Verify terminal markings and grounding arrangement before commissioning.
- For special ratios, special accuracy classes or special operating conditions, technical confirmation is required before ordering.
Selection Guide
How to Select the Correct JDZX15 Model
Select JDZX15-3R for 3kV systems, JDZX15-6R for 6kV systems and JDZX15-10R for 10kV systems. The rated insulation level, voltage ratio and fuse configuration should match the system voltage and switchgear design.
How to Select Accuracy Class and Rated Output
Use metering accuracy classes such as 0.2 or 0.5 for measurement circuits. Use 3P or 6P protection-related classes for residual-voltage or relay protection circuits. The rated secondary output must be selected according to the total connected burden.
How to Confirm Fuse Requirement
The JDZX15-R structure includes a built-in fuse design. Before ordering, confirm the fuse current rating, primary circuit requirement and whether the fuse configuration matches the switchgear protection scheme.
How to Confirm Installation Space
Check the overall length, base width, installation height, terminal box position and primary fuse clearance against the switchgear layout. Sufficient clearance should be reserved for wiring, inspection and replacement.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Product model: JDZX15-3R, JDZX15-6R or JDZX15-10R
- Rated voltage ratio and secondary winding configuration
- Rated frequency: 50Hz or 60Hz
- Required accuracy class and rated output
- Rated insulation level
- Fuse rating or fuse configuration requirement
- 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