Overview
The JDZ10-3/6/10B/180 is an indoor single-phase epoxy cast-resin voltage transformer designed for 3kV, 6kV, and 10kV medium-voltage systems, corresponding to international voltage classes of 3.6kV, 7.2kV, and 12kV. It features a compact 180mm cabinet-type structure with primary-to-secondary ratios such as 3/0.1, 6/0.1, and 10/0.1kV, and supports dual-secondary configurations including 0.1/0.1kV and 0.1/0.22kV.
This transformer delivers standardized secondary outputs for voltage measurement, energy metering (accuracy classes 0.2, 0.5, or 3.0), relay protection, and auxiliary circuits. It complies with GB20840.3-2013 and IEC61869-3:2011 standards and operates reliably in 50Hz or 60Hz AC systems within an ambient temperature range of -25°C to +40°C.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 3kV, 6kV, 10kV |
| Voltage Class | 3.6kV, 7.2kV, 12kV |
| Frequency | 50Hz / 60Hz |
| Insulation Type | Epoxy cast-resin |
| Secondary Outputs | 0.1kV, 0.1/0.1kV, 0.1/0.22kV |
| Max. Output | 500VA, 600VA, or 1000VA |
| Accuracy Classes | 0.2, 0.5, 3.0 |
| Insulation Level | 3.6/25/40kV, 7.2/30/60kV, 12/42/75kV |
| Ambient Temperature | -25°C to +40°C |
| Installation | Indoor switchgear only |
| Weight | Approx. 33kg |
| Standards | GB20840.3-2013, IEC61869-3:2011 |
Model Designation
- J: Voltage transformer
- D: Single-phase structure
- Z: Epoxy cast-resin insulation
- 10: Design series code
- 3 / 6 / 10: Rated system voltage (3kV, 6kV, or 10kV)
- B: Configuration variant per approved drawing
- 180: Compact outline size code (180mm width)
Construction
The JDZ10-3/6/10B/180 features a robust indoor epoxy cast-resin construction, providing excellent electrical insulation, mechanical strength, and resistance to environmental factors such as humidity and dust. The core and windings are fully encapsulated in high-quality epoxy resin under vacuum conditions, ensuring void-free insulation and long-term reliability. The design eliminates the need for oil or gas insulation, making it maintenance-free and suitable for confined indoor installations. Primary and secondary terminals are integrated into the cast body with clear labeling, and the secondary terminal box is accessible for wiring and testing while maintaining IP2X finger-safe protection when installed in switchgear.
Technical Parameters
Service Conditions
- Ambient temperature: -5°C to +40°C
- Altitude: Not exceeding 1000m above sea level
- Relative humidity: Daily average not more than 95%, monthly average not more than 90%
- Installation environment: Indoor, non-corrosive, free from explosive or flammable dust and gases
- Pollution degree: Class II
- Seismic intensity: Not exceeding 8 degrees
Technical Parameters
The JDZ10-3/6/10B/180 is an indoor epoxy cast-resin voltage transformer rated for 3.6kV, 7.2kV, and 12kV insulation classes corresponding to 3kV, 6kV, and 10kV system voltages. It operates within a temperature range of -5°C to +40°C at altitudes up to 1000m, complies with relevant IEC and GB standards, and offers multiple secondary configurations with outputs up to 1000VA.
Voltage Transformer Data
| Type (Ratio) |
Rated Voltage (kV) |
Accuracy Class / Rated Output (VA) |
Max. Output (VA) |
Rated Insulation Level (kV) |
|---|---|---|---|---|
| JDZ10-3B/180 | 3 / 0.1 | 0.2 — 30VA 0.5 — 75VA 1.0 — 150VA 3.0 — 300VA |
600 | 3.6/25/40 |
| JDZ10-6B/180 | 6 / 0.1 | 0.2 — 30VA 0.5 — 75VA 1.0 — 150VA 3.0 — 300VA |
600 | 7.2/30/60 |
| JDZ10-10B/180 | 10 / 0.1 | 0.2 — 30VA 0.5 — 75VA 1.0 — 150VA 3.0 — 300VA |
600 | 12/42/75 |
| JDZ10-3B/180 | 3 / 0.1 / 0.1 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 15VA |
500 | 3.6/25/40 |
| JDZ10-6B/180 | 6 / 0.1 / 0.1 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 15VA |
500 | 7.2/30/60 |
| JDZ10-10B/180 | 10 / 0.1 / 0.1 | 0.2 / 0.2 — 15 / 15VA 0.2 / 0.5 — 15 / 15VA |
500 | 12/42/75 |
| JDZ10-3B/180 | 3 / 0.1 / 0.22 | 0.2 / 3.0 — 30 / 800VA 0.5 / 3.0 — 75 / 800VA |
1000 | 3.6/25/40 |
| JDZ10-6B/180 | 6 / 0.1 / 0.22 | 0.2 / 3.0 — 30 / 800VA 0.5 / 3.0 — 75 / 800VA |
1000 | 7.2/30/60 |
| JDZ10-10B/180 | 10 / 0.1 / 0.22 | 0.2 / 3.0 — 30 / 800VA 0.5 / 3.0 — 75 / 800VA |
1000 | 12/42/75 |
Installation & Wiring
Installation Diagram
The JDZ10-3/6/10B/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 electrical safety. The base dimensions are 370 ±2mm in length and 180 ±1mm in width, with an overall height of 265 ±5mm.
Wiring Diagram
Primary terminals are labeled A and B as shown in the wiring diagram. Secondary terminals may be marked as a, b (for single-secondary models) or 1a, 1b, 2a, 2b (for dual-secondary models). In dual-secondary configurations, verify which secondary winding is designated for metering and which is for monitoring or auxiliary use. All terminal polarities must align with system requirements, and the grounding bolt (M8 reference) must be securely connected to the protective earth. Confirm cabinet clearances and insulation integrity before energizing.
Selection & FAQs
Selection Guide
- Match voltage and insulation: choose 3/0.1kV, 6/0.1kV or 10/0.1kV with the corresponding 3.6/25/40kV, 7.2/30/60kV or 12/42/75kV insulation level.
- Select the secondary scheme: use one 100V winding for a shared measuring circuit, two 100V windings for separated circuits, or 100V plus 220V when the panel requires an auxiliary-voltage supply.
- Size each burden correctly: select the stated VA for the required accuracy; maximum outputs of 500VA, 600VA or 1000VA are thermal limits and do not extend accuracy performance.
- Apply the correct connection: this JDZ model uses A–B line-to-line primary terminals and does not provide the 100/3V residual winding of a JDZX grounded VT.
- Verify site and panel data: confirm the 370 × 180 × 265mm envelope, 310mm mounting reference, terminal allocation, −5°C standard minimum, altitude and M8 protective earth.
Frequently Asked Questions
Q1: Can this epoxy cast-resin VT be installed outdoors?
No, it is strictly designed for indoor installation. The environment must be non-corrosive and free from explosive gases. Contact us for outdoor alternatives.
Q2: Which accuracy class supports 0.5 class at 75VA output?
The 0.5 accuracy class is rated for exactly 75VA output. It also supports 0.2 at 30VA and 1.0 at 150VA. Specify your required burden during ordering.
Q3: What is the maximum altitude for this voltage transformer?
The maximum operating altitude is 1000m above sea level. Applications exceeding this height require derating. Contact our engineers for altitude-specific factory confirmation.
Q4: Does this transformer comply with international IEC standards?
Yes, the JDZ10 series complies with relevant IEC and GB standards. We provide standard type test reports. Request specific certification documents during procurement.
Q5: How can we customize the secondary voltage ratio?
Custom secondary ratios like 10/0.1kV are available for the JDZ10-10B model. Terminal configurations can also be modified. All customizations are subject to factory confirmation.
Q6: Where is this indoor epoxy VT typically applied?
It is primarily applied in indoor switchgear and power distribution panels up to 12kV insulation class. It delivers precise voltage measurement for metering. Consult our catalog for specific panel integration details.
Q7: Why choose the JDZ10-6B for a 6kV system?
It provides a 7.2/30/60 kV rated insulation level specifically matched for 6kV networks. This ensures optimal dielectric strength. Verify your system’s short-time withstand requirements with our technical team.