Overview
The JDZX10-10B/180 is an indoor single-phase epoxy cast-resin grounded voltage transformer rated for 10kV medium-voltage systems (12kV class). It features a fully encapsulated design with high-quality epoxy resin insulation, ensuring reliable performance in indoor switchgear environments.
This transformer delivers accurate secondary outputs for metering (0.1/√3 kV), residual-voltage monitoring (0.1/3 kV), and relay protection applications. It complies with GB20840.3-2013 and IEC61869-3:2011 standards, supporting both 50Hz and 60Hz systems within an ambient temperature range of -25°C to +40°C.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System voltage | 10kV |
| Voltage class | 12kV |
| Rated frequency | 50Hz / 60Hz |
| Voltage ratio | 10/√3 : 0.1/√3 : 0.1/3 kV |
| Max. output | 500VA |
| Insulation level | 12/42/75kV |
| Accuracy class | 0.2/0.5/3P/6P (as per application) |
| Ambient temperature | -25°C to +40°C |
| Installation type | Indoor switchgear |
| Insulation material | Epoxy cast-resin |
| Grounding configuration | Phase-to-neutral (grounded) |
| Weight | Approx. 33kg |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- X: Grounded VT with residual-voltage secondary function
- 10: Design series code
- 10: Rated system voltage (10kV)
- B: Configuration variant per approved drawing
- 180: Compact outline size code
Construction
The JDZX10-10B/180 features a robust indoor epoxy cast-resin construction, fully encapsulating the magnetic core and windings in high-grade insulating resin. This solid insulation system provides excellent dielectric strength, moisture resistance, and mechanical stability, suitable for long-term operation in controlled indoor environments. The primary and secondary terminals are embedded in the resin housing with defined creepage distances, ensuring safety and reliability in 10kV air-insulated switchgear. The compact 180mm form factor allows integration into space-constrained metering or protection compartments without compromising performance.
Technical Parameters
Service Conditions
- Ambient temperature: -5°C to +40°C
- Altitude: up to 1000 m above sea level
- Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%
- Installation environment: indoor, non-corrosive, free from explosive or conductive dust
Technical Parameters
The JDZX10-10B/180 is a 10kV grounded epoxy cast-resin voltage transformer designed for use in 12kV class switchgear. It features indoor installation suitability, compliance with IEC 61869 standards, and operates within an ambient temperature range of -5°C to +40°C at altitudes up to 1000 m.
Voltage Transformer Data
| Type (Ratio) |
Accuracy Class (Protection/ Measurement) |
Rated Output (VA) |
Max. Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZX10-10B/180 10/√3 : 0.1/√3 : 0.1/3kV |
0.2/6P 0.2/3P 0.5/6P 0.5/3P 1.0/6P 1.0/3P 3.0/6P 3.0/3P |
30/50 30/50 50/50 50/50 100/50 100/50 200/50 200/50 |
500 | 12/42/75 |
| JDZX10-10B/180 10/√3 : 0.1/√3 : 0.1/√3 : 0.1/3kV |
0.2/0.5/6P 0.2/0.5/3P |
10/15/50 10/15/50 |
500 | 12/42/75 |
Installation & Wiring
Installation Diagram
The JDZX10-10B/180 voltage transformer is designed for indoor mounting on a flat, rigid surface using the main mounting holes spaced at a 310mm reference length. Ensure adequate clearance around the unit for ventilation and safe access during maintenance. The base width is 180 ±1mm, and the overall height is 265 ±5mm. Secure the unit with appropriate fasteners through the mounting points and connect the grounding bolt (M8 reference) to the facility ground.
Wiring Diagram
Primary connection must follow the A-N phase-to-neutral wiring scheme as specified in the project drawings. Secondary terminals may include 1a, 1n, 2a, 2n, da, and dn depending on the configuration. The da/dn terminals provide residual-voltage output and should be wired according to the open-delta or residual-voltage protection scheme required by the system design. Verify terminal polarity, proper grounding, and sufficient cabinet clearance before energizing the unit.
Selection & FAQs
Selection Guide
- Select the winding arrangement: choose one 100/√3V measuring winding plus 100/3V residual winding, or the four-secondary-terminal version when class 0.2 and class 0.5 circuits must remain separate.
- Match accuracy and burden: single-measuring-winding options range from class 0.2 at 30VA to class 3 at 200VA; the dual-measuring version is rated 10VA/15VA plus 50VA protection output.
- Define the protection class: specify 3P or 6P for the residual-voltage winding according to the relay study and confirm the final open-delta terminal scheme.
- Confirm the voltage factor: rated voltage factor and permissible duration are not published, so confirm them against the neutral-grounding method and earth-fault clearing time.
- Check the installation envelope: verify the 180mm width, 310mm mounting reference, 265mm height, M8 earth connection, service temperature and secondary protective devices.
Frequently Asked Questions
Q1: How should the installation environment be prepared for this transformer?
The installation area must be strictly indoors, non-corrosive, and free from conductive dust. Ambient temperature must remain between -5°C and +40°C with relative humidity below 95%. Confirm your site conditions with our engineering team.
Q2: Which accuracy class is suitable for protective relaying?
Select 3P or 6P protection classes for relay applications. These ensure reliable performance during fault conditions within the 12/42/75 kV insulation level. Specify your exact protection requirements during ordering.
Q3: What is the maximum operating altitude for this transformer?
The maximum rated altitude is 1000 meters above sea level. For installations exceeding this elevation, specific derating factors apply. Please provide your exact site altitude for factory engineering review.
Q4: Are special routine tests performed before shipment?
Yes, standard routine tests compliant with IEC 61869 are conducted prior to dispatch. Additional type tests or special customer requirements are subject to confirmation. Request the detailed test certificate checklist for your project.
Q5: Can the secondary winding ratio be customized?
Custom ratios are available subject to technical confirmation. The standard configuration is 10/√3 : 0.1/√3 : 0.1/3kV for 12kV class switchgear. Share your exact secondary winding requirements with our sales team.
Q6: Why is this model restricted to indoor applications?
This grounded epoxy cast-resin design lacks the weatherproof sealing required for exterior exposure. It is optimized for 12kV class indoor switchgear environments. Contact us if you require an outdoor-rated voltage transformer alternative.