75MVA 220kV three-phase gas-insulated transformer(GTI)
Key attributes
| Brand | ROCKWILL |
| Model NO. | 75MVA 220kV three-phase gas-insulated transformer(GTI) |
| Rated voltage | 110kV |
| Rated frequency | 50/60Hz |
| Series | SQPZ |
Product descriptions from the supplier
Product Overview
SF6 gas is excellent in insulation property, non-flammability and environmental performance. It has laid the foundation of its extensive use due to the advantages of non-flammability, insulativity and safety.Apply to：high-rise building, underground, space-limited, density populated and highly safety required for fire & explosion proof regionAll GITs made by Rockwill pass the factory and site tests at the first trial, the qualification rate is 100% and the accident rate is zero until now.Unique GIT manufacture in China for 220kV grade.
Feature：
High insulation performance: Uses SF₆ gas as the insulation medium, with insulation strength far exceeding that of traditional oil-immersed or dry-type transformers. It is suitable for 220kV high-voltage systems and can operate stably under high voltage.
Compact structural design: The gas insulation feature significantly reduces the volume, with an occupied area only 30%-50% of that of oil-immersed transformers of the same capacity, making it suitable for space-constrained scenarios such as urban substations and underground power stations.
Strong environmental adaptability: The fully sealed structure can resist harsh environments such as dust, humidity, and corrosive gases, with low maintenance requirements, especially suitable for complex working conditions in coastal areas and industrial zones.
High safety and reliability: No flammable insulating oil, avoiding fire risks; the arc-extinguishing property of SF₆ gas can reduce the impact of internal faults and improve the safety of power grid operation.
Efficient energy transmission: Low-loss iron core and winding design, combined with an optimized heat dissipation structure, ensure efficient operation at the rated capacity of 75MVA and reduce energy loss.
Integrated configuration: Often compatible with gas-insulated switchgear (GIS), realizing the integrated layout of transformers and switchgear, simplifying power grid wiring and improving system coordination.
Related Knowledges
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Faults and Handling of Single-phase Grounding in 10kV Distribution LinesCharacteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in01/30/2026 -
Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026 -
What’s the Difference Between Rectifier Transformers and Power Transformers?What is a Rectifier Transformer?"Power conversion" is a general term encompassing rectification, inversion, and frequency conversion, with rectification being the most widely used among them. Rectifier equipment converts input AC power into DC output through rectification and filtering. A rectifier transformer serves as the power supply transformer for such rectifier equipment. In industrial applications, most DC power supplies are obtained by combining a rectifier transformer with rectifier equ01/29/2026
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