Product Overview
The JDZ12(A)-3/6/10(R) and JSZV12-10R fused fully enclosed epoxy cast-resin voltage transformers are designed for 12kV outdoor AC fixed metal-enclosed switchgear, including XGW-12 type switchgear applications. The transformer primary winding includes fuse protection and is designed for connection with an elbow cable plug interface.
This series provides secondary voltage output for voltage metering, monitoring and relay protection. In addition to the 100V measuring voltage, selected configurations can also provide a 220V operating power output for circuit breaker control circuits. The product uses fully enclosed epoxy resin casting, with the core, primary winding and secondary winding encapsulated inside the resin body for moisture resistance and insulation reliability.
Application Position
The JDZ12(A) / JSZV12 voltage transformer is normally installed inside outdoor fixed metal-enclosed switchgear. The primary side connects through elbow cable plugs, while the secondary terminals provide metering, monitoring, relay protection and operating power outputs according to the selected configuration.
General Technical Conditions
| Item | Technical Condition |
|---|---|
| Voltage class | 12kV switchgear class |
| Installation | Outdoor fixed metal-enclosed switchgear |
| Primary protection | Built-in primary fuse |
| Primary connector | Elbow cable plug interface |
| Load power factor | cosφ = 0.8, lagging |
| Altitude | ≤1000m |
| Pollution level | Pollution class II |
| Insulation structure | Fully enclosed epoxy cast-resin insulation |
| Standard reference | GB1207-1997 voltage transformer standard |
Main Applications
- 12kV outdoor fixed metal-enclosed switchgear
- XGW-12 type outdoor AC metal-enclosed switchgear
- Voltage metering and voltage monitoring circuits
- Relay protection voltage input circuits
- 100V measuring voltage output circuits
- 220V operating power supply for circuit breaker control, when specified
- Switchgear applications requiring primary fuse protection and elbow cable plug connection
Key Specifications
| Item | Specification |
|---|---|
| Model series | JDZ12(A)-3/6/10(R), JSZV12-10R |
| Product type | Fused fully enclosed voltage transformer / potential transformer |
| Insulation structure | Fully enclosed epoxy cast-resin insulation |
| Installation | Outdoor fixed metal-enclosed switchgear |
| Switchgear application | XGW-12 type outdoor AC fixed metal-enclosed switchgear |
| Voltage class | 12kV switchgear class |
| Primary protection | Primary winding with fuse protection |
| Primary connection | Elbow cable plug connector interface |
| Secondary output | 100V measuring output; optional 220V operating power output |
| Load power factor | cosφ = 0.8, lagging |
| Altitude | ≤1000m |
| Pollution level | Meets pollution class II requirement |
| Standards | GB1207-1997, GB20840.3-2013, IEC61869-3:2011 or project-specific requirements |
Application Fit
Suitable For
- 12kV outdoor fixed metal-enclosed switchgear
- XGW-12 outdoor AC metal-enclosed switchgear
- Applications requiring elbow cable plug primary connection
- Switchgear requiring built-in primary fuse protection for the VT circuit
- Voltage metering circuits requiring 100V secondary output
- Circuit breaker operating power circuits requiring 220V secondary output
Not Recommended For
- Indoor switchgear designs that do not use elbow cable plug connection
- Withdrawable handcart-type switchgear requiring contact-arm VT structure
- Systems above the specified 12kV switchgear class
- Applications requiring oil-immersed voltage transformer construction
- Special fuse ratings, secondary outputs or connector interfaces without technical confirmation
Technical Structure
| Component | Description |
|---|---|
| Epoxy cast-resin body | Fully enclosed resin casting structure with moisture resistance and insulation performance |
| Core | High-quality cold-rolled steel sheet core |
| Primary winding | Fully cast inside epoxy resin and protected by a primary fuse |
| Secondary winding | Provides measuring voltage and optional operating power output |
| Fuse protection | Fuse current is coordinated with the voltage transformer short-circuit withstand capability |
| Elbow connector interface | Designed for elbow cable plug connection, including COOPER-type connector applications |
| Shielding treatment | Transformer body uses shielding material treatment for improved electrical performance |
Model Designation
The JDZ12(A)-3/6/10(R) and JSZV12-10R model codes can be interpreted as follows:
JDZ12A
| Code | Meaning |
|---|---|
| J | Voltage transformer |
| D | Single-phase structure |
| Z | With residual-voltage winding |
| 12 | Design sequence |
| A | Structure code |
| 3 / 6 / 10 | Model voltage code corresponding to 3.6kV, 7.2kV and 12kV classes |
| R | Fuse-equipped structure |
JSZV12-10R
| Code | Meaning |
|---|---|
| J | Voltage transformer |
| S | Three-phase structure |
| Z | Casting insulation |
| V | V-connection mode |
| 12 | Design sequence |
| 10 | Model voltage code for 12kV switchgear class |
| R | Fuse-equipped structure |
Technical Data
The following technical data is based on the JSZV12-10R product sample and the JDZ12(A)-3/6/10(R) model explanation. Final voltage ratio, rated burden, accuracy class, fuse rating, cable connector interface and dimensions should be confirmed by the approved drawing and product nameplate.
Technical Data Reference
| Type | Voltage
Ratio |
Rated
Insulation Level |
Accuracy Class
and Rated Output |
Max.
Output |
|---|---|---|---|---|
| JSZV12-6R | 6000/100 | 7.2/32/60kV | 0.2—40 0.5—100 1.0—200 3.0—500 |
600VA |
| JSZV12-10R | 10000/100 | 12/42/75kV | ||
| JSZV12-10R | 10000/110 | |||
| JSZV12-10R | 10000/220 | |||
| JSZV12-10R | 6000/100/220 | 7.2/32/60kV | 0.5/3—50/500 | 1000VA for
3-phase group |
| JSZV12-10R | 10000/100/220 | 12/42/75kV |
Technical notes:
- Rated output and its corresponding accuracy class are supplied as one selected combination only.
- The 100V output is used for voltage measurement and metering circuits.
- The 220V output can be used as operating power supply for circuit breaker control when specified.
- Fuse rating should match the voltage transformer short-circuit withstand capability and project protection design.
- For special requirements beyond the listed range, confirmation should be made between manufacturer and purchaser.
Installation and Dimensions
The JSZV12-10R / JDZ12(A) series should be installed according to the approved outline drawing, cable connector layout and switchgear design. Because the primary side uses elbow cable plug connection, the connector type, cable direction, fuse access and grounding arrangement must be confirmed before production.
Overall Dimension Reference
| Item | Dimension / Specification |
|---|---|
| Overall length | 360 mm reference |
| Base length | 340 mm reference |
| Base width | 325 mm reference |
| Main body width | 320 mm reference |
| Overall height | 267 ±5 mm reference |
| Side height | 223 mm reference |
| Primary terminal spacing | 126.5 mm + 126.5 mm reference for three-phase layout |
| Approximate weight | 52 kg |
Terminal and Wiring Notes
- Primary connection should use the specified elbow cable plug interface.
- Secondary terminals should be connected according to the approved wiring diagram.
- The 100V measuring circuit and 220V operating power circuit should be connected separately according to the terminal marking.
- Fuse installation and replacement clearance should be confirmed in the switchgear design.
- Grounding, shielding and terminal polarity must be verified before commissioning.
Compliance and Testing
The JDZ12(A) / JSZV12 series is designed for medium-voltage voltage transformer applications in outdoor fixed metal-enclosed switchgear. The provided technical description refers to GB1207-1997. Project requirements may also reference newer voltage transformer standards according to the 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
- Fuse and primary circuit inspection
- Shielding and grounding verification
- Secondary output and operating power winding verification
Engineering Notes
- Use JDZ12(A) for single-phase applications and JSZV12-10R for three-phase V-connected applications.
- Confirm whether the switchgear is XGW-12 outdoor fixed metal-enclosed type or another compatible design.
- Confirm elbow cable plug type, connector depth, cable direction and primary fuse access before production.
- Confirm whether the project needs only 100V metering output or both 100V metering and 220V operating power output.
- Do not exceed the rated output corresponding to the selected accuracy class.
- For special connector interfaces, fuse ratings or secondary output capacities, technical confirmation is required.
Selection Guide
How to select JDZ12(A) or JSZV12-10R
Select JDZ12(A)-3/6/10(R) for single-phase voltage transformer requirements. Select JSZV12-10R when the switchgear requires a three-phase V-connected voltage transformer arrangement with fuse protection and elbow cable plug connection.
How to confirm connector compatibility
The primary side is designed for elbow cable plug connection. Confirm the cable plug type, manufacturer interface, cable direction, switchgear space and grounding method before final selection.
How to confirm fuse requirement
The primary winding includes fuse protection. The fuse rating should be coordinated with the voltage transformer short-circuit withstand capability and the switchgear protection scheme.
How to confirm 100V and 220V outputs
Use the 100V secondary output for metering or monitoring circuits. Use the 220V output for operating power supply only when the transformer is configured for this function and the circuit breaker control power requirement matches the rated output.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Product model: JDZ12(A)-3/6/10(R) or JSZV12-10R
- Single-phase or three-phase V-connection requirement
- Rated voltage ratio and secondary output requirement
- 100V metering output and/or 220V operating power output requirement
- Accuracy class and rated output
- Fuse rating and protection coordination requirement
- Elbow cable plug model or connector interface requirement
- Switchgear type, cable direction and installation drawing
- Applicable standard or project specification
- Quantity and documentation requirements