Customization 6kV 10kV 20kV 22kV 33kV Oil-Immersed High-Voltage Side-Mounted Grounding Transformer source manufacturer

Name: Customization 6kV 10kV 20kV 22kV 33kV Oil-Immersed High-Voltage Side-Mounted Grounding Transformer source manufacturer
Brand: Wenzhou Rockwell Transformer Co., Ltd.
SKU: 1269
Price: 1.99 USD
Availability: InStock

Wenzhou Rockwell Transformer Co., Ltd.

12yrs + staff 60000+m² US$100000000+ China

Wenzhou Rockwell Transformer Co., Ltd.

12yrs + staff 60000+m² US$100000000+ China

Attributes Description Documentation Resource Library Supplier

Key attributes

Brand	Rockwell
Model NO.	Customization 6kV 10kV 20kV 22kV 33kV Oil-Immersed High-Voltage Side-Mounted Grounding Transformer source manufacturer
Rated voltage	24kV
Rated frequency	50/60Hz
Cooling mode	ONAN
Series	JDS

Product descriptions from the supplier

Description

Description

As the earliest specialized manufacturer of grounding transformers in China, we have built a complete independent industrial chain through decades of technological accumulation. Leveraging the long-term verified reliability of our products and our continuous innovation capabilities, we consistently lead the upgrading of industry standards, serving as a technological pioneer in the field of power safety equipment.

Earthing transformers are specially designed transformers. Their core function is to provide an artificial neutral point for power grids where the neutral point is either ungrounded or grounded through high impedance. This enables the neutral point to be grounded via an arc suppression coil or a small resistor.

The oil-immersed, high-voltage bushing side-mounted type grounding transformer (commonly referred to in the industry as the "high-voltage side-mounted grounding transformer") is a specialized variant. As the name implies, the high-voltage bushings (i.e., the terminals of the high-voltage winding) of this type of transformer adopt a side-mounted design, positioned on the side of the transformer tank rather than on the top.

This structural design significantly reduces the overall installation height of the equipment, making it particularly suitable for space-constrained installations, such as indoor GIS (Gas-Insulated Switchgear) rooms, compact substations, and retrofit projects in existing substations.

Features

Space Optimization: The side-exit bushings significantly reduce the overall equipment height, enabling easy adaptation to low-clearance spaces or retrofit requirements in existing substations, saving civil engineering costs.
Flexible Grounding: Provides a stable neutral point, allowing flexible connection to a resistor cabinet / arc suppression coil. This effectively limits ground fault current, suppresses overvoltages, and enhances system safety and power supply continuity.
High Reliability:
Impact Resistance: Designed to withstand the impact of unbalanced currents and zero-sequence currents generated by system single-phase-to-ground faults.
Low Losses: Employs high-quality silicon steel cores and advanced manufacturing processes to ensure low no-load and load losses.
Robust Insulation: Features a reliable high-voltage insulation structure with low partial discharge levels.
Excellent Protection: High enclosure protection rating (IP), providing effective dust and moisture resistance.
Simplified Installation & Maintenance: Compact structure combined with the side-exit wiring design optimizes both on-site installation and subsequent maintenance operations.

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	Earthing transformer
Reference standard	IEC 60076
Rated power	334kVA
Rated voltage	6kV 10kV 20kV 22kV 33kV
Number of phase	3
Vector of group	ZN
Cooling method	ONAN
Winding material	Copper
Cooling medium	Mineral oil
Zero phase sequence impedance at 75℃	58.62 Ohms/phase

Main Application Areas

Power Generation Systems: Neutral grounding for auxiliary power systems in thermal/nuclear/hydroelectric plants
New Energy Stations: Grounding protection for collection systems in photovoltaic/wind/storage power plants
Industrial Power Distribution: Grounding for high-voltage motors and distribution systems in petrochemical, metallurgical, and mining industries
Transportation Power Systems: Grounding for railway traction substations, metro main substations, and port shore power systems
Special Scenarios: Grounding systems for precision power supply in data centers, hospitals, and laboratories

FAQ for

Q: What is the relationship between the short-time capacity and short-circuit withstand time of an earthing/grounding transformer？

The two are core parameters that restrict each other, following the inverse proportional relationship of "for the same equipment, the longer the withstand time, the smaller the short-time capacity" — because short-time capacity is calculated based on the thermal effect of fault current. Under the same fault current, the longer the withstand time, the more heat the equipment absorbs. To avoid insulation damage due to overheating, the rated short-time capacity must be reduced. For example, a 110kV earthing/grounding transformer has a short-time capacity of 5MVA under 30-second withstand time; if the withstand time is increased to 60 seconds, its short-time capacity may drop to about 3MVA (specifically, it must be implemented in accordance with the manufacturer's technical manual).

Q: How to coordinately determine the short-time capacity and short-circuit withstand time parameters of an earthing/grounding transformer during selection?

Selection suggestions: The resistance value of the earthing resistor must be calculated in combination with the zero-sequence impedance of the earthing/grounding transformer, usually satisfying "earthing resistance R ≤ Uₚₕ/Iₚₑₐₖ" (Uₚₕ is the system phase voltage, Iₚₑₐₖ is the maximum short-time fault current allowed by the earthing/grounding transformer). At the same time, it must comply with the resistance value requirements for different grounding systems in the standard DL/T 621-1997 "Earthing of AC Electrical Installations".

Know your supplier

Rockwell

Wenzhou Rockwell Transformer Co., Ltd.
12yrs 60000+m² US$100000000+ China

Wenzhou Rockwell Transformer Co., Ltd.

12yrs 60000+m² US$100000000+ China

Online store

On-time delivery rate

Response time

100.0%

≤4h

Company overview

Workplace: 60000m² Total staff: Highest Annual Export(usD): 100000000

Workplace: 60000m²
Total staff:
Highest Annual Export(usD): 100000000

Services

Business Type: Design/Manufacture/Sales

Main Categories: High Voltage Electrical Apparatus/Electric transformer

Whole life care manager

Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.

Negotiable

Pricing calculator

Model

JDS-334-22

Warranty by

Whole life care manager

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.

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