Overview
The JDZ12(A)-3/6/10(R) and JSZV12-10R are fused, fully enclosed epoxy cast-resin voltage transformers rated for 12kV outdoor AC fixed metal-enclosed switchgear applications, including XGW-12 type installations. These units feature primary fuse protection and an elbow cable plug interface, with all internal components—core, primary winding, and secondary winding—fully encapsulated in moisture-resistant epoxy resin for enhanced insulation reliability.
Designed to meet GB1207-1997 standards, they deliver accurate secondary outputs for metering (100V), monitoring, relay protection, and optionally 220V operating power for circuit breaker control circuits. Their construction ensures stable performance under pollution class II conditions and altitudes up to 1000m, making them suitable for demanding outdoor switchgear environments.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Voltage class | 12kV switchgear class |
| Primary protection | Built-in primary fuse |
| Primary connector | Elbow cable plug interface |
| Secondary output (standard) | 100V |
| Secondary output (optional) | 220V (for control circuits) |
| Load power factor | cosφ = 0.8, lagging |
| Installation environment | Outdoor fixed metal-enclosed switchgear |
| Altitude limit | ≤1000m |
| Pollution level | Class II |
| Insulation structure | Fully enclosed epoxy cast-resin |
Construction
The JDZ12(A) and JSZV12 voltage transformers employ a fully enclosed epoxy cast-resin construction, in which the magnetic core, primary winding, and secondary winding are completely embedded within a solid resin body. This design provides excellent mechanical strength, superior moisture resistance, and long-term insulation integrity under outdoor operating conditions. The primary winding incorporates an integrated fuse for overcurrent protection and terminates in an elbow cable plug interface compatible with standard 12kV outdoor switchgear systems. Secondary terminals are accessible via insulated bushings on the exterior of the cast housing, allowing safe connection to metering, protection, and control circuits as configured.
Technical Parameters
Service Conditions
- Altitude: ≤1000m
- Pollution level: Meets pollution class II requirement
- Installation environment: Outdoor fixed metal-enclosed switchgear
- Switchgear application: XGW-12 type outdoor AC fixed metal-enclosed switchgear
Technical Parameters
The JDZ12(A)/JSZV12 fused fully enclosed voltage transformer is designed for 12kV switchgear applications, featuring fully enclosed epoxy cast-resin insulation and fuse-protected primary windings. It operates under standard conditions up to 1000m altitude and complies with GB1207-1997, GB20840.3-2013, and IEC61869-3:2011.
Model Variants
| 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 |
Voltage Transformer Data
| Type (Ratio) |
Rated Insulation Level (kV) |
Accuracy Class and Rated Output |
Max. Output |
|---|---|---|---|
| JSZV12-6R 6000/100 |
7.2/32/60 | 0.2—40 0.5—100 1.0—200 3.0—500 |
600VA |
| JSZV12-10R 10000/100 |
12/42/75 | 0.2—40 0.5—100 1.0—200 3.0—500 |
600VA |
| JSZV12-10R 10000/110 |
|||
| JSZV12-10R 10000/220 |
|||
| JSZV12-10R 6000/100/220 |
7.2/32/60 | ||
| JSZV12-10R 10000/100/220 |
12/42/75 | 0.5/3—50/500 | 1000VA for 3-phase group |
- 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 & Wiring
Installation Diagram
The JSZV12-10R / JDZ12(A) series must be installed in accordance with the approved outline drawing, cable connector layout, and switchgear design. Due to the elbow cable plug connection on the primary side, confirm the connector type, cable direction, fuse access, and grounding arrangement prior to production.
Wiring Diagram
Primary connection must use the specified elbow cable plug interface. Secondary terminals should be wired according to the approved wiring diagram. The 100V measuring circuit and 220V operating power circuit must be connected separately as indicated by terminal markings. Ensure sufficient clearance for fuse installation and replacement within the switchgear design. Verify grounding, shielding, and terminal polarity before commissioning.
Selection & FAQs
Selection Guide
- Identify the verified model: detailed ratings are provided for JSZV12 variants only; request separate electrical and mechanical data before specifying JDZ12(A) as an equivalent.
- Match ratio and insulation: select the 6kV/100V version with 7.2/32/60kV insulation or the 10kV/100V version with 12/42/75kV insulation.
- Select the secondary duty: use a single 100V or 110V measuring output, a 220V-only option, or the 100V/220V combination when control power is required.
- Check control-power demand: confirm breaker-coil inrush, continuous load, power factor and voltage regulation against the listed 500VA class 3.0 winding and 1000VA group limit.
- Approve the interface: coordinate fuse data, elbow-plug standard and manufacturer, cable direction, shielding, grounding, replacement clearance and the final switchgear layout.
Frequently Asked Questions
Q1: Can this 12kV voltage transformer be installed indoors?
No, this model is designed for outdoor fixed metal-enclosed switchgear applications. It meets pollution class II requirements for outdoor environments. Please specify indoor requirements for alternative model selection.
Q2: How is the primary winding protected against short circuits?
The primary winding features integrated fuse protection to prevent short-circuit damage. This fully enclosed epoxy cast-resin design maintains dielectric integrity in 12kV systems. Confirm specific fuse ratings with our engineering team.
Q3: What is the maximum operating altitude for this transformer?
The standard maximum operating altitude is 1000m. For installations exceeding this elevation, derating factors apply. Please provide your exact site altitude for factory technical evaluation.
Q4: Does this voltage transformer comply with IEC standards?
Yes, it complies with IEC61869-3:2011 alongside domestic GB standards. The transformer operates within the standard 12kV voltage class. Specify your required certification documents during the initial inquiry.
Q5: Are factory routine tests performed before shipment?
Yes, standard routine tests are conducted prior to dispatch to ensure compliance. Specific test protocols depend on the final purchase agreement. Request the detailed test report format from our sales team.
Q6: Which switchgear model is this 12kV transformer compatible with?
It is specifically designed for XGW-12 type outdoor AC fixed metal-enclosed switchgear. The JDZ12(A) and JSZV12-10R series fit standard 12kV voltage class applications. Verify mechanical dimensions with your switchgear supplier.
Q7: Why choose fully enclosed epoxy cast-resin insulation?
This insulation structure provides moisture resistance and pollution protection for outdoor environments. It maintains dielectric strength in 12kV switchgear applications under pollution class II conditions. Request material datasheets for specific project requirements.