Download the app
  • 33kv Oil Immersed Grounding /Earthing Transformer
33kv Oil Immersed Grounding /Earthing Transformer
discuss personally
Model
JDS-15240KVA-33KV
Basic info Product Detail Supplier
Basic info
Brand ROCKWILL
Model NO. 33kv Oil Immersed Grounding /Earthing Transformer
Rated voltage 33kV
Phases Three-phase
Frequency range 50/60Hz
Series JDS
Product Detail

Product Overview

Rockwill specializes in the design and manufacturing of 33kV oil immersed grounding transformers, engineered for reliable grounding protection in power systems. Our products comply with IEC and IEEE international standards, ensuring stable and safe operation of electrical networks.

Key Specifications

Product Highlights

Premium Core

The transformer core is made of high-quality cold-rolled oriented silicon steel sheets with 45° full diagonal joints. The iron yoke is securely clamped with through bolts, and the core columns are tied with fiberglass tape. The core surface is coated with silicone resin adhesive for moisture protection and noise reduction.

Superior Winding

The windings are constructed with high-quality copper conductors in a segmented cylindrical structure to enhance interlayer insulation. Vacuum drying technology is applied to ensure excellent electrical performance, high mechanical strength, and minimal partial discharge.

Advanced Insulation and Cooling

The oil immersed grounding transformer features a fully sealed tank with corrugated fins for efficient heat dissipation, eliminating the need for an oil storage tank. Oil tanks are sealed with oil-resistant rubber strips to prevent contact with air, preserving the insulating oil quality and extending transformer lifespan. Compact footprint, aesthetic appearance, and maintenance-free design are key benefits.

Comprehensive Protection Devices

Equipped with pressure relief valves, gas relays, and oil level gauges for real-time monitoring of oil condition. Temperature control devices support remote transmission, allowing convenient supervision of transformer operating temperature.

Technical Parameters

  • Transformer Type: Oil Immersed

  • Connection Groups: ZN (Zigzag)

  • Rated Voltage: Up to 36kV

  • Rated Current: Up to 3000A

  • Short Time Duration: 10s / 30s / 60s or customized

  • Cooling Method: ONAN, ONAF, AN, AF

  • Installation: Indoor / Outdoor

  • Ambient Temperature Range: -40°C to +40°C

  • Standards Compliance: IEC 60076-6, IEC 60076-1, IEEE

  • Enclosure Options: Transformer cabinet with customizable IP ratings, optional CT, VT, and isolation switch

Notes

  • Neutral short time current I0 = IG

  • Neutral zero-sequence impedance Z0 = Phase impedance / 3

  • ±5% off-load tap changer

  • Confirm Z0 value before production if not self-limiting

  • Z0 tolerance ≤ 10%

Rockwill 33kV Oil Immersed Grounding Transformers combine advanced engineering and strict quality control to deliver dependable grounding solutions for power networks worldwide. For inquiries and customization, please contact us.

Know your supplier
ROCKWILL
Rockwill Electric Group Global Manufacturer of High voltage and medium-voltage power equipment and smart grid solutions. Headquartered in Wenzhou, China. Serving 100+ countries with quality, innovation, and trust. What We Offer: • HV-MV switchgear (VCB, SF₆ circuit breakers, RMU, GIS) • Distribution transformers and substations • Smart grid and monitoring systems • Solar, wind, EV charging, and energy storage solutions • EPC turnkey power projects Certified: ISO 9001 / ISO 14001 / ISO 45001
Main Categories
High voltage
Business Type
Design/Manufacture/Sales
Highest Annual Export (USD)
$150,000,000
Professional Experience
16 years
Workplace
108000m²m²
占位
占位
FAQ
Q： How does the Zig-Zag connection in your 33kV grounding transformer work?
A：
The Zig-Zag (ZN) winding provides a low-impedance path for ground fault currents while blocking normal load currents. During a fault, it creates opposing magnetic fluxes to limit current to safe levels (24.8A continuous/800A for 20s) while maintaining system stability and preventing overvoltage damage. Its zero-sequence impedance (Z₀) is precisely controlled within ≤10% tolerance to ensure reliable fault current limitation.
Related Products
More
Related Knowledges
More
Analysis of Transformer Capacity, Load Rate and Number of Units Selection Issues
Analysis of Transformer Capacity, Load Rate and Number of Units Selection Issues
The safe and economical operation of power transformers is related to the safety, economy, stability, and reliability of the operations of various industries. The limitations of conditions such as the investment economic indicators for its selection, the economic benefits of maintenance and operation, and the adaptability in the new environment (access of distributed power sources, configuration of energy storage, etc.) make it impossible to include comprehensive factors in other aspects.The cap
Leon
07/17/2025
Analysis of the Impact of Immersion on the Performance of Low-Voltage Current Transformers
Analysis of the Impact of Immersion on the Performance of Low-Voltage Current Transformers
1 IntroductionLow - voltage current transformers for metering, with a through - core type epoxy resin structure, are widely used in distribution transformer areas and for small - to - medium - sized industrial and commercial electricity consumption. As a range expander for electric energy metering, their performance directly relates to electricity consumption safety and the accuracy of users' trade calculations. Studying long - term immersion's impact on these transformers is practically signifi
Felix Spark
07/17/2025
What is reactive power measurement?
What is reactive power measurement?
The power which exists in the circuit when the voltage and current are out of phase to each other, such type of power is known as the reactive power. The formula measures the reactive power in the circuitReactive Power Measurement & VarmetersReactive power measurement is critical as it indicates circuit power loss: low reactive power worsens load power factor, increasing system losses. Varmeters (volt-ampere reactive meters) measure reactive power and are categorized by circuit phases:Single
Edwiin
07/17/2025
How to Design and Install a Solar PV System?
How to Design and Install a Solar PV System?
Design and Installation of Solar PV SystemsModern society relies on energy for daily needs like industry, heating, transport, and agriculture, mostly met by non-renewable sources (coal, oil, gas). However, these cause environmental harm, are unevenly distributed, and face price volatility due to limited reserves—driving demand for renewable energy.Solar energy, abundant and capable of meeting global needs, stands out. Standalone PV systems (Fig 1) offer energy independence from utilities.
Edwiin
07/17/2025
What are the common faults that occur when low-voltage current transformers are combined with other power equipment?
What are the common faults that occur when low-voltage current transformers are combined with other power equipment?
Low-voltage current transformers, as indispensable measurement and protection devices in power systems, often encounter various faults when used in combination with other power equipment due to environmental factors, equipment linkage issues, and improper installation and maintenance. These faults not only affect the normal operation of power equipment but may also endanger personal safety. Therefore, it is necessary to gain an in-depth understanding of fault types, judgment methods, and prevent
Felix Spark
07/17/2025
What are the monitoring methods and future development trends of low-voltage voltage transformers?
What are the monitoring methods and future development trends of low-voltage voltage transformers?
With the continuous advancement of smart grid technology, intelligent monitoring systems are playing an increasingly important role in preventing and addressing faults in voltage transformers. These modern intelligent monitoring systems can collect key parameters from voltage transformers in real time—such as partial discharge levels, temperature, and oil quality—and use data analysis algorithms to assess the health status of the equipment, enabling early fault warnings and precise l
Echo
07/16/2025
×
Inquiry
Download
IEE-Business is dedicated to serving the personnel in the global power industry.
Join IEE-Business, not only can you discover power equipment and power knowledge, but also canhnd like - minded friends!
App Store App Store App Store App Store App Store App Store App Store App Store
App Store