Overview
The JDZQN-10 and JDZXN-10 are indoor epoxy cast-resin metering voltage transformers designed for 10kV medium-voltage power systems. Both models utilize electromagnetic induction to step down high primary voltage to standardized secondary outputs, with insulation provided by solid epoxy resin casting for reliable indoor operation.
These transformers meet accuracy classes of 0.2 or 0.5 for metering applications and comply with IEC 61869 standards. They supply precise voltage signals for electric energy metering, revenue metering systems, voltage indication, power monitoring devices, and relay protection circuits requiring 100V, 100/√3V, or residual-voltage (0.1/3kV) outputs.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System voltage | 10kV |
| Primary voltage (JDZQN-10) | 10kV |
| Primary voltage (JDZXN-10) | 10/√3 kV |
| Secondary voltage (metering) | 0.1kV (100V) or 0.1/√3 kV (100/√3 V) |
| Residual voltage output (JDZXN-10) | 0.1/3 kV (33.3V) |
| Accuracy class | 0.2 or 0.5 (metering) |
| Frequency | 50Hz |
| Insulation type | Epoxy cast-resin |
| Installation type | Indoor |
| Phase configuration | Single-phase |
| Application | Metering, monitoring, protection input |
| Standard compliance | IEC 61869 |
Construction
The JDZQN-10 and JDZXN-10 feature a robust epoxy cast-resin construction, where the core and windings are fully encapsulated in solid epoxy resin under vacuum conditions. This provides excellent electrical insulation, mechanical strength, and resistance to environmental factors such as humidity and contamination. The cast-resin body ensures stable performance over time, with minimal partial discharge and consistent voltage ratio accuracy. All primary and secondary terminals are integrated into the molded resin housing, offering secure connection points suitable for indoor switchgear environments. The design eliminates the need for oil or gas insulation, making it maintenance-free and non-flammable.
Technical Parameters
Service Conditions
- Ambient temperature: -5°C to +40°C
- Altitude: Not exceeding 1000m above sea level
- Relative humidity: Average daily value not more than 95%, average monthly value not more than 90%
- Installation environment: Indoor, non-corrosive, free from explosive or conductive dust, and without severe vibration or shock
Technical Parameters
The JDZQN-10 and JDZXN-10 are indoor epoxy cast-resin metering voltage transformers designed for 12kV class switchgear with a system voltage of 10kV. They feature high insulation performance (12/42/75kV), operate within standard ambient temperatures (-5°C to +40°C) and altitudes up to 1000m, and comply with IEC 61869 standards. These units support accuracy classes 0.2 and 0.5 for precision metering and general measurement applications.
Model Variants
| Type (Ratio) |
Accuracy Class (Protection/ Measurement) |
Rated Output (VA) |
Burden (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZQN-10 (10 / 0.1kV) |
0.2 | 20 | 500 | 12 / 42 / 75 |
| 0.5 | 50 | 500 | ||
| JDZXN-10 (10/√3 / 0.1/√3 / 0.1/3kV) |
0.2/3P | 20/50 | 500 | 12 / 42 / 75 |
| 0.5/3P | 50/50 | 500 |
Installation & Wiring
Installation Diagram
The JDZQN-10 and JDZXN-10 indoor epoxy cast-resin metering voltage transformers are installed vertically on a mounting base within switchgear or metering cabinets. Secure the unit using the base mounting holes with appropriate fasteners, ensuring alignment with the internal reference spacing of 175mm. The overall base length is 378mm and base width is 180mm. Maintain adequate clearance around the unit for ventilation and access to terminals.
Wiring Diagram
The JDZQN-10 is wired for standard 10/0.1kV metering applications. The JDZXN-10 must be connected according to the grounded-neutral or residual-voltage configuration specified in the project drawings. Primary terminals use 2-M10 bolts and must follow phase sequence and direction as indicated in the approved switchgear wiring diagram. Secondary terminals are clearly marked; verify polarity before connecting to energy meters or measuring instruments to ensure accurate metering. All grounding connections, including the M8 grounding bolt, must comply with the cabinet grounding scheme. Keep secondary wiring short, secure, and properly insulated to minimize voltage drop and measurement error.
Selection & FAQs
Selection Guide
- Choose the connection first: use JDZQN-10 for A–B line-to-line 10/0.1kV measurement, or JDZXN-10 for 10/√3kV phase-to-earth measurement with residual-voltage protection.
- Select metering performance: specify class 0.2 at 20VA for higher-precision measurement or class 0.5 at 50VA for general metering and indication.
- Define the protection circuit: JDZXN-10 provides a 100/3V, class 3P winding rated 50VA; confirm the three-unit open-delta terminal diagram and relay burden.
- Separate rated and maximum output: treat the listed 500VA as the thermal limit, not the burden at which class 0.2 or 0.5 accuracy is guaranteed.
- Verify application data: confirm 50Hz frequency, 12/42/75kV insulation, rated voltage factor for JDZXN, the 378 × 180mm base, 175mm mounting reference and site conditions.
Frequently Asked Questions
Q1: Which accuracy class is suitable for precision metering applications?
Select the 0.2 accuracy class for precision metering, offering 20VA rated output. The 0.5 class provides 50VA for general measurements. Confirm your specific burden requirements with our engineering team.
Q2: What are the required indoor installation environmental conditions?
Install in non-corrosive environments free from explosive dust and severe vibration. Ambient temperature must remain between -5°C and +40°C with altitude below 1000m. Verify site conditions before deployment.
Q3: Can this voltage transformer be used in 12kV switchgear?
Yes, it is specifically designed for 12kV class switchgear with a 10kV system voltage. It features 12/42/75kV rated insulation levels. Contact us to confirm exact system parameters.
Q4: What international standards does this epoxy cast-resin transformer comply with?
The JDZXN-10 series fully complies with IEC 61869 standards. All units undergo rigorous factory testing to ensure high insulation performance. Request the specific test certificates for your project.
Q5: How do I specify the correct model variant for ordering?
Choose JDZQN-10 for 10/0.1kV ratio or JDZXN-10 for 10/√3 / 0.1/√3 / 0.1/3kV applications. Specify your required accuracy class and burden during inquiry. Lead times are subject to confirmation.
Q6: Is this manufacturer capable of supplying 10kV metering voltage transformers?
Yes, we manufacture indoor epoxy cast-resin metering voltage transformers for 10kV systems. Our JDZQN-10 and JDZXN-10 models support standard switchgear integration. Contact our sales team for bulk pricing.
Q7: What is the maximum relative humidity for safe operation?
The average daily relative humidity must not exceed 95%, with a monthly average below 90%. Ensure proper indoor ventilation to prevent condensation. Confirm local climate data with our engineers.