Overview
The JDZX(F)9-35Q is an indoor epoxy resin cast single-phase voltage transformer designed for 35kV medium-voltage distribution systems. It utilizes advanced epoxy resin cast insulation technology, delivering high dielectric strength and maintenance-free operation in indoor environments.
This series supports multiple accuracy classes (0.2, 0.5, 1.0, 3P/6P) and offers flexible winding configurations for energy metering, voltage monitoring, and relay protection applications. Available in three-winding (JDZX9-35Q, Y/△) and four-winding (JDZXF9-35Q, Y/Y/△) models, it provides up to 600VA thermal limit output capacity while maintaining a compact 58kg design for simplified installation.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System Voltage | 35 kV |
| Maximum System Voltage | 40.5 kV |
| Insulation Level | 40.5/95/200 kV |
| Primary Voltage | 35/√3 kV |
| Secondary Voltage | 100/√3 V or 100 V |
| Residual Voltage | 100 V (open-delta) |
| Accuracy Classes | 0.2, 0.5, 1.0, 3P, 6P |
| Thermal Limit Output | Up to 600 VA |
| Frequency | 50 Hz |
| Phase | Single-phase |
| Installation Type | Indoor |
| Insulation Material | Epoxy resin cast |
Construction
The JDZX(F)9-35Q features a robust epoxy resin cast construction, encapsulating all active components in a solid, void-free insulation matrix. This design provides excellent moisture resistance, high mechanical strength, and superior dielectric performance suitable for continuous indoor operation. The core and windings are fully embedded within the epoxy resin, eliminating the need for external insulation maintenance. Terminal connections are integrated into the cast body with clearly marked polarity indicators, ensuring safe and reliable wiring. The compact, lightweight housing (58 kg) facilitates easy mounting in switchgear panels without requiring extensive structural support.
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 JDZX(F)9-35Q series comprises indoor epoxy resin cast single-phase voltage transformers designed 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 (higher altitudes available on request). They comply with GB20840.1.3 and IEC61869-1.3 standards.
| Type | Rated
Voltage (kV) |
Class
combination |
Accuracy class
/ Rated output (VA) |
Secondary thermal
limit output (VA) |
|||
|---|---|---|---|---|---|---|---|
| 0.2 | 0.5 | 1 | 3P(6P) | ||||
| 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
Installation Diagram
The JDZX(F)9-35Q is designed for indoor mounting in switchgear or substations. Install three units for three-phase systems, ensuring adequate clearance and secure fastening to the base plate (315mm x 200mm). Use the lifting hook during handling and connect the grounding terminal (M8) to the facility ground.
Wiring Diagram
Primary windings are connected in a star configuration with the neutral point grounded. Secondary windings for measurement and protection are also wired in star. Residual voltage windings are connected in an open-delta arrangement to enable ground fault detection. Terminal markings follow standard IEC conventions as shown in the diagram.
Selection & FAQs
Selection Guide
- Select based on system voltage: JDZX(F)9-35Q is rated for 35kV systems with a 40.5/95/200kV insulation level.
- Choose model JDZX9-35Q for three-winding applications or JDZXF9-35Q for four-winding configurations offering dual secondary outputs and enhanced flexibility.
- Pick accuracy class according to application: 0.2 for high-precision metering, 0.5 for standard metering, 1.0 for general measurement, or 3P/6P for protection functions.
- Determine rated output (15–150VA) based on the total burden of connected instruments and relays.
- Specify frequency (50Hz or 60Hz), indoor installation type, and order in sets of three for complete three-phase systems.
Frequently Asked Questions
Q1: Can this 35kV voltage transformer operate above 1000m altitude?
Yes, subject to factory confirmation. Standard units are rated for altitudes up to 1000m and -5°C to +40°C. Contact us for custom high-altitude specifications.
Q2: Which accuracy class is suitable for protective relaying?
Select the 3P or 6P class combination for protection applications. The JDZX(F)9-35Q provides 150VA thermal limit output for these secondary windings. Verify exact burden requirements with our engineering team.
Q3: How is this single-phase unit connected in a three-phase system?
Three single-phase units must be used together to form a three-phase system. They are designed for indoor switchgear with single-phase connections. Confirm wiring diagrams during project commissioning.
Q4: What international standards does this epoxy resin transformer comply with?
The unit complies with IEC61869-1.3 and GB20840.1.3 standards. It features epoxy resin cast insulation for minimal maintenance. Request the specific type test certificates for your project documentation.
Q5: Can this 35kV instrument transformer be used in 60Hz power grids?
Yes, it supports both 50Hz and 60Hz operating frequencies. The epoxy resin cast design ensures reliable performance across these standard grid frequencies. Specify your exact frequency requirement when ordering.
Q6: What is the primary application for the JDZX9-35Q series?
This indoor epoxy resin voltage transformer is designed for 35kV switchgear and distribution points. It provides signals for metering and protection. Contact our team for specific application guidance.
Q7: Why choose epoxy resin cast insulation for indoor voltage transformers?
Epoxy resin provides excellent dielectric strength and requires minimal maintenance. This makes it highly suitable for compact indoor substation installations.