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Dry Type Grounding Transformer

This Dry Type Grounding Transformer is designed to provide an artificial neutral point for medium-voltage power systems where a suitable neutral point is not directly available.

Using cast resin insulation technology, the transformer provides reliable electrical insulation, mechanical strength and flame-retardant performance. Its configuration can be engineered according to system voltage, grounding method, neutral current and required fault duration.

The transformer is suitable for medium-voltage distribution networks, substations, renewable energy systems, industrial power systems and other applications requiring reliable neutral grounding solutions.

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Basic Info.

A grounding transformer, also known as an earthing transformer, is used to create an artificial neutral point in a power system and provide a defined path for system grounding.

In some medium-voltage systems, particularly systems without an accessible neutral point, a grounding transformer can be connected to the network to establish a neutral point for grounding and protection purposes.

This dry type grounding transformer uses cast resin insulation and an air-cooled configuration, providing an oil-free solution for applications where fire safety, indoor installation and reduced maintenance are important.

The transformer can be engineered according to the electrical characteristics of the power system, including rated voltage, grounding method, neutral current, fault duration, insulation level and installation environment.

Depending on the system design, the grounding transformer can be coordinated with grounding resistors or other grounding equipment to achieve the required grounding impedance and fault-current characteristics.

For renewable energy applications, the grounding transformer can also be considered for medium-voltage collection systems where an artificial neutral point is required for system grounding and protection.

All technical parameters should be confirmed according to the customer's power system design and applicable standards before production.

Performance parameters for reference

Parameter	Typical Configuration / Project Requirement
Product Type	Dry Type Grounding Transformer
Insulation	Cast Resin / Epoxy Resin
Phase	Three Phase
Cooling	AN – Air Natural
Installation	Indoor / Outdoor with Suitable Enclosure
System Voltage	According to Project Requirement
Rated Capacity	According to System Design
Vector Group	ZNynl1

Note:Grounding transformer capacity and neutral current are highly dependent on the grounding method and system fault calculation. Final technical parameters should be confirmed by engineering calculation before quotation and production.

How Does a Grounding Transformer Work?

A grounding transformer provides an artificial neutral point for a three-phase electrical system.

A typical system arrangement is:

Medium-Voltage Network → Grounding Transformer → Neutral Point → Grounding Equipment → Earth

When the power system does not have a directly accessible neutral point, the grounding transformer establishes a suitable connection point for grounding.

Under normal operating conditions, the transformer has limited impact on the three-phase power supply. During a ground fault, it provides a controlled path for zero-sequence current, allowing the protection system to detect and isolate the fault.

The grounding transformer can therefore work together with grounding resistors, relays and protection equipment to improve the grounding and fault protection performance of the electrical system.

Key Features

1. Artificial Neutral Point

The grounding transformer provides an artificial neutral point for medium-voltage systems without a directly available neutral connection.

2. Reliable System Grounding

It provides a defined electrical path for grounding and zero-sequence current, supporting the operation of system protection equipment during ground faults.

3. Cast Resin Insulation

The cast resin insulation structure provides reliable electrical insulation, mechanical strength and flame-retardant performance without the use of transformer oil.

4. Oil-Free Design

The dry type construction eliminates transformer oil leakage and reduces fire-related risks, making it suitable for indoor substations, industrial facilities and renewable energy installations.

5. Flexible Engineering Configuration

Voltage, capacity, neutral current, fault duration, vector group, impedance and other parameters can be configured according to the power system design.

6. Suitable for Renewable Energy Systems

Grounding transformers can be used in renewable energy power systems where medium-voltage collection networks require an artificial neutral point for grounding and protection.

Application scenarios

Wind Power Systems

Can be applied to medium-voltage wind farm collection systems according to the grounding design.

Medium-Voltage Distribution Networks

Provides an artificial neutral point for distribution systems where the existing network does not have a suitable neutral connection.

Solar PV Power Plants

Suitable for selected medium-voltage PV collection systems where system grounding requirements require an artificial neutral point.

Why Choose a Dry Type Grounding Transformer?

1.Oil-Free and Flame Retardant

Cast resin insulation eliminates the need for transformer oil and provides a safer solution for indoor electrical installations.

2.Engineering-Based Customization

Grounding transformers are highly dependent on the system grounding method. Voltage, neutral current, fault duration and other parameters can be configured according to the project design.

3.Compact Installation

The dry type construction can be suitable for indoor substations, renewable energy facilities and industrial electrical rooms where space and fire safety are important.

4.Integration with Grounding Systems

The transformer can be designed to work with grounding resistors, protection relays and other grounding equipment according to the customer's system configuration.

5.International Project Support

Technical specifications, drawings and test documentation can be prepared according to applicable project requirements and target-market standards.

FAQ

Q1: What is a dry type grounding transformer?

A dry type grounding transformer is a transformer used to establish an artificial neutral point in an electrical system where a suitable neutral connection is not directly available.

It provides a controlled path for grounding and zero-sequence current during ground faults.

Q2: What is the difference between a grounding transformer and a normal distribution transformer?

A normal distribution transformer is primarily designed to transfer electrical power between different voltage levels.

A grounding transformer is primarily designed to establish a neutral point and provide a grounding path for the power system.

Its capacity and electrical parameters are therefore determined differently from those of a conventional distribution transformer.

Q3: What is an artificial neutral point?

An artificial neutral point is a neutral connection created by a grounding transformer in a three-phase system that does not have a directly accessible neutral point.

It provides a connection point for system grounding equipment.

Q4: Can a grounding transformer be used with a grounding resistor?

Yes. A grounding transformer can be connected to a grounding resistor between its neutral point and earth.

This configuration can be used to control ground-fault current according to the system grounding design.

Q5: Can grounding transformers be used in solar PV power plants?

Yes, grounding transformers can be used in selected solar PV medium-voltage collection systems where an artificial neutral point is required.

The suitability and configuration must be determined according to the PV plant's grounding system and protection design.

Q6: Can the grounding transformer parameters be customized?

Yes. Grounding transformer parameters are normally customized according to the electrical system.

Important parameters include system voltage, neutral current, fault duration, grounding method, insulation level, impedance and installation conditions.

Q7: Is a dry type grounding transformer suitable for indoor installation?

Yes. The oil-free cast resin construction makes dry type grounding transformers suitable for many indoor applications, including substations, industrial facilities and electrical rooms.

The final protection enclosure should be selected according to the installation environment.

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