Overview
The JDZW-35KV outdoor fully enclosed epoxy resin voltage transformer is a precision electromagnetic instrument engineered for accurate voltage measurement, energy metering, and relay protection in 35kV AC power systems. Operating on Faraday’s law of electromagnetic induction, it delivers galvanically isolated secondary voltage signals proportional to the primary system voltage while maintaining precise phase relationships.
Built for rugged outdoor service, this transformer features a pillar-type mounting design with fully sealed epoxy resin insulation that ensures long-term resistance to moisture, UV radiation, pollution, and mechanical stressâmaking it ideal for substations and distribution networks exposed to harsh environmental conditions.
Key Ratings Snapshot
| Item | Specification |
|---|---|
| System voltage class | 35 kV (outdoor) |
| Rated frequency | 50 Hz (60 Hz on request) |
| Rated secondary voltage | 100 V or 100/â3 V |
| Accuracy classes | 0.2, 0.5 (metering); 6P (protection) |
| Rated burden | Per core as specified (VA) |
| Burden power factor | cosÏ = 0.8 (lagging) |
| Insulation level | 40.5/95/200 kV (Um/LIPL/ACSD) |
| Applicable standards | IEC 61869-3, GB/T 20840.3 |
| Model variant | JDZW-35 |
| Construction type | Epoxy resin cast, fully enclosed, post-type |
Model Designation
- J: Voltage transformer (VT / PT)
- D: Single-phase design
- Z: Support (pillar / post) type
- W: Outdoor installation
- 35: Voltage class (kV)
Construction
The JDZW-35KV features a robust pillar-type structure designed for secure outdoor mounting. Its core is built from cold-rolled grain-oriented silicon steel laminations, heat-treated for optimal magnetic performance. The entire assembly is encapsulated using advanced vacuum casting technology with UV-resistant, anti-tracking epoxy resin, eliminating internal voids and ensuring uniform dielectric strength.
This fully enclosed design provides exceptional resistance to moisture ingress, surface tracking, pollution, and agingâcritical for reliable operation in coastal, industrial, or high-humidity environments. The terminal box is metal-enclosed with a sealed, padlockable cover and multiple cable entry points, ensuring secure and tamper-resistant secondary connections.
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) |
|---|---|---|---|---|---|
| JDZW-35 | 35000/100 | 0.2 | 75 | 1000 | 40.5/95/200 |
| JDZW-35 | 35000/100 | 0.5 | 100 | 1000 | 40.5/95/200 |
Installation & Wiring
Installation Diagram
The JDZW-35KV voltage transformer must be securely mounted on a stable concrete foundation or steel structure using the provided fixing holes. Primary connection is typically made via overhead conductor or busbar, while secondary wiring is routed through the sealed terminal box. Maintain adequate electrical clearance and creepage distance per local regulations.
Outline Dimensions
| Dimension | Value (mm) |
|---|---|
| Total height | 1250 |
| Base width | 320 x 320 |
| Mounting hole pattern | 260 x 260 |
| Bolt size | M16 |
| Primary terminal height | 1100 |
| phi of base holes | 18 |
Selection & FAQs
Selection Guide
- Select voltage ratio based on system nominal voltage (35kV) and required secondary voltage (100V for line-to-line, 100/â3 V for line-to-ground).
- Choose accuracy class per application: Class 0.2 for revenue metering, 0.5 for indication, or 6P for protection (note: JDZW-35 supports single-core configurations only).
- Calculate total rated burden (VA) by summing input impedance of connected meters, relays, and wiring losses at 100V.
- Confirm insulation level (40.5/95/200 kV) meets or exceeds system requirements based on grounding method and overvoltage exposure.
- For ground fault detection requiring residual voltage, consider JDZXW-35 variants insteadâJDZW-35 does not include an auxiliary winding.
- Specify altitude, pollution severity, or special environmental conditions during ordering for engineering validation.
Frequently Asked Questions
Q1: Can this 35kV outdoor voltage transformer be installed in high-humidity coastal areas?
Yes, provided relative humidity stays below 95% daily average. It features fully enclosed epoxy resin insulation suitable for pollution severity level II environments. Confirm specific site conditions with our engineering team.
Q2: Which accuracy class is recommended for metering and protection applications?
Select the 0.2 class for precise metering and 0.5 class for general measurement. Both support a 35000/100V ratio with up to 1000VA maximum output. Consult factory support for custom accuracy combinations.
Q3: What is the insulation level for the JDZW-35 epoxy resin transformer?
The rated insulation level is 40.5/95/200 kV. This fully enclosed design ensures reliable performance in outdoor 35kV systems up to 1000m altitude. Verify specific altitude derating requirements if your site exceeds this limit.
Q4: Are custom voltage ratios and specific accuracy class combinations available?
Yes, custom voltage ratios and accuracy combinations are available. All standard ratings are per nameplate, but special burdens require prior consultation. Contact our factory engineering support before placing your order.
Q5: What factory test reports and certifications accompany this 35kV transformer?
Routine testing is conducted prior to dispatch. Specific type test reports and compliance certificates are subject to confirmation based on your project requirements. Please contact our sales team for detailed documentation.
Q6: Where is this 35kV outdoor epoxy voltage transformer typically applied?
It is primarily used for voltage measurement and protection in 35kV outdoor power distribution systems. The fully enclosed epoxy resin design provides excellent weather resistance. Confirm suitability for your specific substation application with our engineers.
Q7: How does high altitude affect the performance of this 35kV transformer?
Standard models are rated for installation up to 1000m above sea level. For altitudes exceeding this limit, insulation and thermal performance may require derating. Consult our technical team for high-altitude project specifications.