Overview
The JDZXW-35 is a precision outdoor epoxy resin-cast voltage transformer designed for 35kV AC power systems, delivering accurate voltage measurement and reliable relay protection performance. It operates on electromagnetic induction principles to provide galvanically isolated secondary signals proportional to the primary system voltage, ensuring safety and precision in medium-voltage applications.
Built for harsh outdoor environments, this fully enclosed pillar-type transformer supports energy metering, ground fault detection via open-delta residual voltage, and SCADA integration. Its robust construction guarantees long-term stability under pollution, moisture, and UV exposure typical of substation service conditions.
Key Ratings Snapshot
| Item | Specification |
|---|---|
| System voltage class | 35 kV (outdoor) |
| Rated frequency | 50 Hz (60 Hz optional) |
| Primary voltage | 35000/sqrt(3) V |
| Secondary voltages | 100/sqrt(3) V (main), 100/3 V (auxiliary) |
| Accuracy classes | Metering: 0.2 or 0.5; Protection: 6P |
| Rated burden | Per core as specified (VA) |
| Burden power factor | cos phi = 0.8 (lagging) |
| Insulation level | 40.5/95/200 kV (Um/LIPL/ACSD) |
| Applicable standards | IEC 61869-3, GB/T 20840.3 |
| Mounting type | Pillar (post) type, outdoor |
Model Designation
- J: Voltage transformer (VT / PT)
- D: Single-phase design
- Z: Support (pillar / post) type
- X: Auxiliary secondary winding for open-delta connection
- W: Outdoor installation
- 35: Voltage class (kV)
Construction
The JDZXW-35 features a fully enclosed epoxy resin cast body with UV-resistant, anti-tracking formulation, providing superior insulation, moisture resistance, and mechanical strength for outdoor service. The pillar-type structure ensures adequate electrical clearance and creepage distance, meeting pollution severity level II per IEC 60815.
Its core uses cold-rolled grain-oriented silicon steel laminations, heat-treated for optimal magnetic performance. Advanced vacuum casting eliminates voids, while the sealed metal terminal box protects secondary connections and allows secure cable entry with padlock provision. This maintenance-free design prevents internal condensation and withstands decades of environmental stress.
Technical Parameters
Service Conditions
- Installation environment: Outdoor
- Altitude: <= 1000 m above sea level
- Ambient temperature: -5 deg C to +40 deg C
- Relative humidity: Daily average <= 95%, monthly average <= 90% (at +20 deg C)
- Environmental conditions: Free from corrosive gases, explosive media; pollution severity level II per IEC 60815
Technical Data
| Model | Voltage Ratio (V) |
Accuracy Class Combination |
Rated Output (VA) |
Maximum Output (VA) |
Insulation Level (kV) |
|---|---|---|---|---|---|
| JDZXW-35 | 35000/sqrt(3) / 100/sqrt(3) / 100/3 | 0.2/6P | 40/100 | 1000 | 40.5/95/200 |
| JDZXW-35 | 35000/sqrt(3) / 100/sqrt(3) / 100/3 | 0.5/6P | 80/100 | 1000 | 40.5/95/200 |
| JDZXW-35 | 35000/sqrt(3) / 100/sqrt(3) / 100/3 | 0.2/0.2/6P | 20/20/100 | 1000 | 40.5/95/200 |
Installation & Wiring
Installation Diagram
The JDZXW-35 must be securely mounted on a stable concrete foundation or steel structure using the designated fixing holes. Primary connection is typically made via overhead conductor or busbar, while secondary wiring is routed through the sealed terminal box. Maintain adequate clearance for insulation coordination, heat dissipation, and maintenance access. In seismic zones, additional mechanical reinforcement may be required per local codes.
Outline Dimensions
| Dimension | Value (mm) |
|---|---|
| Total height | 1250 |
| Base width | 320 x 320 |
| Mounting hole pattern | phi 18, 280 x 280 |
| Creepage distance | >= 900 |
| Weight (approx.) | 120 kg |
Selection & FAQs
Frequently Asked Questions
Q1: What are the outdoor installation limits for this 35kV voltage transformer?
It is rated for outdoor use up to 1000m altitude. Ambient temperature must remain between -5°C and +40°C with pollution severity level II. Contact us for high-altitude or extreme climate applications.
Q2: Which accuracy class combination is suitable for protection and metering?
The 0.2/6P or 0.5/6P classes are ideal for combined metering and protection. For dual metering cores, select the 0.2/0.2/6P configuration. Specify your exact burden requirements during ordering.
Q3: How is the insulation level rated for the JDZXW-35 transformer?
The insulation level is 40.5/95/200 kV for power frequency, lightning, and switching impulses. This fully enclosed epoxy design ensures reliable performance in pollution level II environments. Request the detailed type test report for your project.
Q4: Can we order custom voltage ratios or accuracy classes?
Yes, custom configurations are available subject to factory confirmation. All standard ratings are per the nameplate and factory test report. Please consult our engineering team for specific non-standard requirements.
Q5: Are routine factory tests performed before shipping the 35kV VT?
Yes, routine tests per IEC standards are conducted, with all ratings verified per the factory test report. Special type tests or specific certification requirements are subject to confirmation. Contact sales for detailed test documentation.
Q6: Where is this fully enclosed 35kV voltage transformer typically applied?
It is designed for outdoor 35kV power systems requiring reliable voltage measurement and protection. The epoxy resin casting provides excellent resistance against corrosive gases and explosive media.