11kV 15kV 20kV 22kV Three-Phase Oil-Immersed Earthing/Grounding Transformer China Manufacturer
Key attributes
| Brand | Rockwell |
| Model NO. | 11kV 15kV 20kV 22kV Three-Phase Oil-Immersed Earthing/Grounding Transformer China Manufacturer |
| Rated frequency | 50/60Hz |
| Rated capacity | 500kVA |
| Series | JDS |
Product descriptions from the supplier
Description
Earthing transformers are classified as standard reactors. An earthing transformer (neutral coupler) is a three-phase transformer connected to the power system to provide a neutral connection for earthing, either directly or via impedance. The earthing transformers may, in addition, supply a local auxiliary load.
During single-phase faults, the reactor limits the fault current in the neutral, and the restoration of the power line is improved. According to the IEC 60076-6 standard, the neutral-earthing reactor is connected between the neutral of a power system and the earth to limit the line to earth current under system earth fault conditions to the desired value.
The earthing transformer creates a neutral point for a network. ZN connection is usually applied. Z connection provides linear and specified zero sequence impedance. YN + d can also be applied.
Features
Functional Uniqueness:
Constructing an Artificial Neutral Point: Provides a reliable neutral point connection for systems with ungrounded or high-impedance grounded neutrals (such as IT systems and resonant grounded systems).
Grounding Path Management: The neutral point can be directly grounded or grounded via a reactor/resistor, precisely limiting single-phase ground fault current (in line with IEC 60076-6).
Fault Current Control:
Suppressing Fault Current: Limits the ground fault current to a safe valuev by connecting a neutral reactor in series, preventing equipment damage.
Accelerating System Recovery: Reducing the magnitude of the fault current helps the arc self-extinguish, shortens power outage duration, and improves power supply continuity.
Winding Connection Methods:
ZN Type (Zigzag Connection): A mainstream design that provides linear zero-sequence impedance, with strong magnetic circuit balance and anti-saturation capability.
YN+d (Star + Delta): The secondary delta winding can supply auxiliary loads (doubling as a station service transformer function).
Controllable Zero-Sequence Impedance: Impedance values can be customized to ensure precise matching with the system protection strategy.Safety and Standard Compliance:
Following IEC 60076-6: Regulates the temperature rise, insulation, and short-circuit withstand capability of neutral reactors.
Overvoltage Suppression: Limits transient overvoltages caused by ground faults, protecting equipment insulation.
Main Technical Parameters
Some of these earthing transformers cover voltage levels including：3.3kV / 6kV / 11kV / 15kV / 20kV / 22kV / 30kV / 33kV / 34.5kV / 36kV / 44kV / 66kV / 88kV / 110kV / 132kV / 145kV / 150kV / 220kV / 275kV / 330kV / 400kV, etc. The current withstand time ranges from 1s, 2s, 3s, 5s, 6s, 8s, 9s, 10s, 30s, 60s, 1hour to 2hours, and customization is available.
Parameter |
Specification |
Transformer type |
Grounding transformer |
Reference standard |
IEC 60076 |
Rated power |
500kVA |
Rated voltage |
11kV |
Rated frequency |
50Hz |
Cooling method |
ONAN |
Main Application Areas
Industrial Power Distribution: Grounding protection for plant electrical systems in petrochemical, metallurgical, and mining industries
Grid Infrastructure: Neutral grounding retrofits for urban distribution substations and switching stations
New Energy Stations: Grounding systems for grid-connected sides of distributed photovoltaic plants and biomass power generation
Transportation Power: Grounding devices for electrified railway traction substations and metro power supply networks
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Related Knowledges
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Can the secondary neutral of a control transformer be grounded?Grounding the secondary neutral of a control transformer is a complex topic involving multiple aspects such as electrical safety, system design, and maintenance.Reasons for Grounding the Secondary Neutral of a Control Transformer Safety considerations: Grounding provides a safe path for current to flow to earth in the event of a fault—such as insulation failure or overload—instead of passing through the human body or other conductive paths, thereby reducing the risk of electric shock. System sta12/05/2025 -
Wiring Methods and Parameters of Grounding TransformersGrounding Transformer Winding ConfigurationsGrounding transformers are classified by winding connection into two types: ZNyn (zigzag) or YNd. Their neutral points can be connected to an arc suppression coil or a grounding resistor. Currently, the zigzag (Z-type) grounding transformer connected via an arc suppression coil or a low-value resistor is more commonly used.1. Z-Type Grounding TransformerZ-type grounding transformers come in both oil-immersed and dry-type insulation versions. Among them12/05/2025 -
Why Do We Need a Grounding Transformer and Where Is It Used?Why Do We Need a Grounding Transformer?The grounding transformer is one of the most important devices in power systems, primarily used to connect or isolate the system neutral point to ground, thereby ensuring the safety and reliability of the power system. Below are several reasons why we need grounding transformers: Prevent Electrical Accidents:During the operation of a power system, abnormal conditions such as voltage leakage may occur in equipment or lines due to various reasons. If the neut12/05/2025 -
How to Implement Transformer Gap Protection & Standard Shutdown StepsHow to Implement Transformer Neutral Grounding Gap Protection Measures?In a certain power grid, when a single-phase ground fault occurs on a power supply line, both the transformer neutral grounding gap protection and the power supply line protection operate simultaneously, causing an outage of an otherwise healthy transformer. The main reason is that during a system single-phase ground fault, the zero-sequence overvoltage causes the transformer neutral grounding gap to break down. The resulting12/05/2025 -
GIS Dual Grounding & Direct Grounding: State Grid 2018 Anti-Accident Measures1. Regarding GIS, how should the requirement in Clause 14.1.1.4 of the State Grid’s "Eighteen Anti-Accident Measures" (2018 Edition) be understood?14.1.1.4: The neutral point of a transformer shall be connected to two different sides of the main mesh of the grounding grid via two grounding down conductors, and each grounding down conductor shall meet the thermal stability verification requirements. Main equipment and equipment structures shall each have two grounding down conductors connected to12/05/2025 -
Innovative & Common Winding Structures for 10kV High-Voltage High-Frequency Transformers1.Innovative Winding Structures for 10 kV-Class High-Voltage High-Frequency Transformers1.1 Zoned and Partially Potted Ventilated Structure Two U-shaped ferrite cores are mated to form a magnetic core unit, or further assembled into series/series-parallel core modules. Primary and secondary bobbins are mounted on the left and right straight legs of the core, respectively, with the core mating plane serving as the boundary layer. Windings of the same type are grouped on the same side. Litz wire i12/05/2025
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