3kV Distribution Type Metal Oxide Surge Arrester for Electrical Equipment Protection

Key Features

Distribution-Class Overvoltage Protection

Designed for compatible 3kV-class distribution applications requiring protection against transient overvoltages.

Metal Oxide Varistor Technology

Uses the nonlinear electrical characteristics of metal oxide elements to limit surge voltage.

Compact Insulating Structure

The ribbed external housing provides an insulating structure in a compact product form.

Lightning and Switching Surge Protection

Helps limit voltage stress associated with lightning impulses and switching transients.

Terminal Connection Design

Threaded metal terminals are provided at both ends for electrical connection according to the installation design.

Insulation Coordination Support

Can be selected in coordination with the insulation withstand level of the protected electrical equipment.

Model-Specific Electrical Ratings

Rated voltage, continuous operating voltage and protective characteristics are determined by the selected arrester model.

Project-Based Configuration

Electrical ratings and mechanical requirements can be reviewed against the project specification.

Working Principle

A metal oxide surge arrester uses nonlinear resistive elements to control transient overvoltages.

During normal operation, the arrester presents relatively high resistance at the applied system voltage, allowing only a small leakage current.

When a lightning impulse or switching surge occurs, the nonlinear resistance decreases rapidly, enabling surge current to pass through the arrester and limiting the voltage appearing across its terminals.

As the transient overvoltage subsides, the arrester returns toward its normal high-resistance operating condition.

The protective performance depends on the arrester's rated voltage, continuous operating voltage, residual voltage and energy-handling capability, as well as the electrical characteristics of the protected system.

Applications

Depending on the selected ratings and protection design, this series may be used for:

• 3kV-class electrical distribution systems

• Distribution transformer overvoltage protection

• Industrial electrical distribution equipment

• Electrical switching equipment protection

• Instrument transformer protection

• Power distribution panels and associated equipment

• Distribution substations with compatible voltage requirements

• Electrical equipment insulation coordination

• Industrial utility power systems

• Electrical distribution renovation projects

Product Structure

The external structure consists of:

• Ribbed insulating housing

• Upper threaded metal terminal

• Lower threaded metal terminal

• Metal end fittings

• External insulating sheds

• Internal protective components, subject to the model's construction

The exact housing material, internal configuration and mounting accessories should be verified from the technical drawing.

How to Select a 3kV Surge Arrester

1. Confirm the System Voltage

Identify the nominal system voltage, maximum operating voltage and grounding arrangement.

2. Determine Ur and Uc

Select the arrester rated voltage (Ur) and continuous operating voltage (Uc) according to the system's operating and temporary overvoltage conditions.

3. Check the Protective Level

Compare the arrester's residual voltage with the insulation withstand level of the protected equipment.

4. Evaluate Surge Duty

Confirm the required discharge current, energy-handling capability and relevant surge conditions.

5. Review the Installation Environment

Consider indoor or outdoor installation, pollution conditions, altitude, terminal connections and mounting requirements.

6. Confirm Technical Documentation

Verify the applicable standards, model specifications and availability of type-test documentation before procurement.

Q1. What is a 3kV distribution type surge arrester used for?

A 3kV distribution type surge arrester is intended for compatible distribution applications requiring protection against lightning and switching overvoltages. The selected model must match the electrical characteristics of the system and protected equipment.

Q2. Is a 3kV surge arrester suitable for every 3kV electrical system?

Not necessarily. Arrester selection depends on the system's maximum operating voltage, grounding conditions, temporary overvoltage requirements and insulation coordination. The nominal voltage alone is not sufficient for selection.

Q3. What is the difference between Ur and Uc?

Ur is the arrester's rated voltage, while Uc is its continuous operating voltage. Both values are important for selecting an arrester suitable for the electrical system.

Q4. Can this arrester protect distribution transformers?

It may be used for compatible transformer protection applications, provided the selected model's voltage rating, protective level and installation requirements match the transformer system.

Q5. What technical information is required before ordering?

Please provide system voltage, grounding arrangement, required Ur and Uc, discharge-current requirements, installation conditions and any applicable project specification.

Q6. Are type-test documents available?

Please specify the exact arrester model and required documentation. Availability of type-test reports and other technical documents should be confirmed for the selected model.

Q7. Can DGG support project-specific requirements?

Customers may submit their electrical specifications, installation drawings and documentation requirements for configuration review.

Need a 3kV Surge Arrester for Your Distribution Project?

Choosing a metal oxide surge arrester requires more than matching a nominal voltage. Continuous operating voltage, residual voltage, grounding arrangement and insulation coordination all influence the appropriate model selection.

Send DGG your system specifications, required arrester ratings or existing equipment details. We can assist in reviewing suitable configurations and confirming available technical documentation.

Contact DGG Power for 3kV Surge Arrester Specifications and a Quotation.