Overview
The JDZ9-35Q series (including JDZXF9-35Q and JDZX9-35Q variants) is a single-phase indoor voltage transformer rated for 35kV medium-voltage systems. It utilizes epoxy cast-resin insulation technology, delivering high dielectric strength and maintenance-free operation in controlled indoor environments.
Designed for energy metering, voltage monitoring, and relay protection, the unit offers accuracy classes of 0.2, 0.5, and 1.0 with a thermal limit output up to 600VA. It meets standard insulation levels of 40.5/95/200kV (power frequency/lightning impulse/power frequency short-time), ensuring reliable performance in 35kV indoor switchgear and substations.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35 kV |
| Insulation Level | 40.5/95/200 kV |
| Accuracy Classes | 0.2, 0.5, 1.0 |
| Thermal Limit Output | Up to 600 VA |
| Phase Configuration | Single-phase |
| Installation Type | Indoor |
| Insulation Material | Epoxy cast-resin |
| Primary Connection | Star-connected (in three-phase setups) |
| Secondary Windings | Single or multiple (model-dependent) |
| Frequency | 50 Hz |
| Weight | Approx. 107 kg |
| Application Standard | IEC 61869-3 |
Construction
The JDZ9-35Q series features a robust epoxy cast-resin construction, where both primary and secondary windings are fully encapsulated in high-quality epoxy resin under vacuum conditions. This process eliminates air voids and ensures uniform electric field distribution, providing excellent partial discharge resistance and long-term insulation integrity. The solid, monolithic structure offers superior mechanical strength, moisture resistance, and flame retardancy, making it ideal for indoor switchgear environments. All live parts are completely sealed within the resin matrix, eliminating the need for oil or gas insulation and enabling maintenance-free operation throughout its service life.
Technical Parameters
Service Conditions
- Installation position: Indoor switchgear, substations, or distribution points
- Ambient temperature: -5°C to +40°C
- Altitude: ≤ 1000m (standard), higher altitude available on request
- Insulation: Epoxy resin cast
- Frequency: 50Hz or 60Hz
- Connection: Single-phase (three units for three-phase system)
- Maintenance: Minimal maintenance required (epoxy resin design)
Technical Parameters
The JDZ9-35Q series comprises indoor epoxy cast-resin voltage transformers rated for 35kV systems. These units operate within an ambient temperature range of -5°C to +40°C and are suitable for installations up to 1000m altitude. They comply with GB20840.1.3 and IEC61869-1.3 standards.
| Type | Rated
Voltage (kV) |
Class | Accuracy class /
Rated output (VA) |
Secondary thermal
limit output (VA) |
|||
|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 3P(6P) | ||||
| JDZ9-35Q | 35/0.1 | 0.2 0.5 1.0 | 50 | 120 | 250 | 600 | |
| JDZF9-35Q | 35/0.1/0.1 | 0.2/0.5 | 20 | 40 | 60 | 2*300 | |
| JDZX9-35Q | 35/√3 : 0.1/√3 : 0.1/3 | 0.2/3P(6P) 0.5/3P(6P) |
30 | 60 | 150 | 100 | 600 |
| JDZXF9-35Q | 35/√3 : 0.1/√3 : 0.1/√3 : 0.1/3 | 0.2/0.5/3P(6P) | 15 | 20 | 100 | 2*300 | |
Installation & Wiring
Outline Dimensions
Overall dimensions: top width 390mm, base width 545mm, height 495mm. Weight: approximately 107kg. Mounting holes: 4-φ13 on base plate.
Wiring Diagram
Single-phase connection: primary terminals A, B; secondary terminals 1a-1b (metering), 2a-2b (protection). Three-phase V-connection is available for open-delta configuration.
Selection & FAQs
Selection Guide
- Choose the right model: Select JDZ9-35Q for basic measurement, JDZF9-35Q for dual secondary outputs, JDZX9-35Q for ground fault detection, or JDZXF9-35Q for comprehensive protection functions.
- Match accuracy class to application: Use class 0.2 for revenue metering, 0.5 for monitoring, 1.0 for general measurement, and 3P/6P for protection circuits.
- Verify burden compatibility: Ensure the transformer’s rated output (e.g., 50VA) matches the total load of connected devices like meters and relays to maintain accuracy.
- Confirm environmental suitability: The unit is rated for indoor use with ambient temperatures from -5°C to +40°C and standard altitude up to 1000m.
- Specify electrical parameters: Clearly define the voltage ratio (e.g., 35/0.1 kV), frequency (50Hz or 60Hz), and any custom requirements when ordering.
Frequently Asked Questions
Q1: Can this 35kV voltage transformer be installed outdoors?
No, it is strictly designed for indoor switchgear and substations. The epoxy resin cast insulation is not rated for outdoor weather exposure. Contact us for outdoor alternatives.
Q2: What accuracy class should I select for revenue metering?
Select the 0.2 class for high-precision revenue metering applications. It provides a rated output of 50VA for the JDZ9-35Q model. Confirm your exact burden requirements with our engineering team.
Q3: How many units are required for a three-phase system?
Three single-phase units are required to form a complete three-phase system. The JDZ9-35Q operates as a single-phase device at 50Hz or 60Hz frequencies. Verify connection diagrams during installation planning.
Q4: Are higher altitude configurations available beyond the standard 1000m limit?
Yes, higher altitude configurations are available upon request. The standard rating is up to 1000m. Please specify your exact site altitude during the inquiry for factory confirmation.
Q5: Which international standards does this cast-resin transformer comply with?
The JDZ9-35Q series complies with IEC61869-1.3 and GB20840.1.3 standards. Ensure your project specifications match these requirements before ordering. Request the full test report from our sales team.
Q6: Why choose epoxy resin cast insulation for this 35kV transformer?
It provides excellent dielectric strength and requires minimal maintenance for indoor switchgear applications. The solid insulation prevents environmental degradation. Contact us for material specification sheets.