I. 110kV Epoxy Resin Cast CT Selection Scheme
In modern power distribution, especially within urban centers or industrial plants, the demand for safety and space efficiency has made the Epoxy Resin Cast CT a premier choice. This solution focuses on a Dry-type architecture that prioritizes fire safety and minimal operational oversight.
1. Core Product Features & Advantages
Maintenance-free Design: Unlike oil-filled units, the epoxy resin insulation eliminates the need for oil testing, filtration, or leak monitoring, significantly reducing long-term OPEX.
Fire-proof & Explosion-proof: The solid casting material is inherently flame-retardant. It eliminates the risk of oil-based fires or high-pressure explosions, making it the safest option for indoor and underground installations.
Compact Size: The high dielectric strength of epoxy resin allows for a more streamlined, Space-saving design. This is specifically engineered for integration into compact medium-voltage switchgear or mobile substations.
Superior Mechanical Strength: The rigid cast structure provides excellent resistance to vibration and mechanical shocks, ensuring structural integrity during short-circuit events.
Environmental Stability: The fully encapsulated primary and secondary windings are protected against dust, moisture, and chemical contaminants, ensuring a stable Insulation Reliability.
2. Technical Standards & Quality Assurance
As a trusted global service provider, HENGFENGYOU ELECTRIC GROUP ensures all cast resin transformers comply with IEC 60044, ANSI, and GB standards. Each unit undergoes rigorous routine testing in our certified laboratories to ensure High Precision and zero-defect performance before delivery.
II. Design and Installation Scheme
1. Integration with Switchgear
The 110kV Epoxy Resin CT is optimized for Indoor GIS or high-voltage switchgear compartments. Its compact dimensions allow designers to optimize the layout of the distribution room, reducing the overall footprint of the substation.
2. Installation & Handling
Dry Handling: Because there is no liquid insulation, installation is simplified. However, care must be taken to ensure the casting surface remains clean and free of conductive dust.
Flexible Mounting: These units can be mounted in multiple orientations (vertical or horizontal) depending on the busbar configuration, providing greater flexibility than traditional oil-immersed models.
Secondary Connection: Secondary terminals are typically housed in a dedicated box with high Degree of Protection (IP65) to prevent environmental interference.
III. Testing and Intelligent Maintenance
1. Commissioning Tests
Prior to energization, the following tests are mandatory to ensure system safety:
Insulation Resistance & Power Frequency Withstand: To verify the integrity of the resin casting.
Excitation Characteristic Test: To confirm the knee-point voltage and ensure the CT does not saturate under fault conditions.
Accuracy Verification: Confirming the unit meets 0.2S or 5P20 requirements for billing and protection.
2. Digitalization and Monitoring
In line with the "Smart Electric" vision, these CTs can be integrated with digital sensors:
Temperature Monitoring: Optional embedded sensors to monitor the internal temperature of the resin block.
Smart Grid Compatibility: Fully compatible with digital relaying systems and IEC 61850 communication protocols for real-time status reporting.
IV. Technical Overview Table
| Dimension |
Core Content |
Recommended Solution/Standard |
| Selection |
Safety & Maintenance |
Dry-type / Maintenance-free |
| Technical Specs |
Reliability |
Fire-proof & Explosion-proof |
| Installation |
Space Optimization |
Compact Design for Switchgear |
| Compliance |
Global Standards |
IEC 60044, CE, UL, ROHS |
V. About HENGFENGYOU ELECTRIC GROUP
HENGFENGYOU ELECTRIC GROUP is an electrical enterprise integrating R&D, manufacturing, and trade. With over 550 employees and 30 years of experience, we specialize in providing innovative power distribution solutions that drive the global energy transition. Our state-of-the-art production workshops utilize advanced vacuum casting technology to ensure our epoxy resin products meet the highest global quality standards.
VI. FAQ
1. Can Epoxy Resin CTs be used outdoors?
While primarily designed for indoor or enclosed switchgear, specialized outdoor versions with UV-resistant coatings are available for specific environments.
2. How does "Dry-type" improve safety?
It removes the flammable oil medium, eliminating the risk of fire spread and toxic smoke in the event of an internal fault.
3. Are these units compatible with 110kV GIS?
Yes, their compact and rigid design makes them ideal for integration within Gas Insulated Switchgear enclosures.
4. What is the typical lifespan of a HENGFENGYOU Cast CT?
With no oil to degrade, these units are designed for a service life exceeding 25-30 years under normal operating conditions.
5. Does HENGFENGYOU provide customized dimensions?
Yes, our R&D team can design specific CT profiles to fit into existing or highly compact switchgear cabinets.
