6kV Distribution Type Zinc Oxide Surge Arrester for Power Distribution Systems

Product Dimensions

Dimensions are based on the 6kV distribution-type drawing and should be confirmed against the final production drawing.

Key Features

6kV Distribution Application

Designed for compatible 6kV nominal distribution system applications requiring transient overvoltage protection.

Zinc Oxide Varistor Technology

Uses nonlinear zinc oxide varistor elements to limit lightning and switching overvoltages.

Two Voltage Configurations

Available in YH5WS-7.6/30 and YH5WS-10/30 configurations with different Ur and Uc ratings.

Ribbed Insulating Housing

The ribbed external structure provides the required insulating surface configuration for the selected product design.

Threaded Terminal Connections

Metal terminal connections at both ends facilitate electrical connection according to the installation design.

Defined Protective Characteristics

Specified residual voltage characteristics support insulation coordination with protected electrical equipment.

Technical Specification-Based Selection

Model selection can be evaluated according to rated voltage, continuous operating voltage and system conditions.

Working Principle

The metal oxide surge arrester operates through the nonlinear voltage-current characteristics of zinc oxide varistor elements.

During normal operation, the varistor elements present high resistance, allowing only a small leakage current.

When lightning or switching overvoltage occurs, the resistance decreases rapidly, creating a path for surge current and limiting the voltage appearing across the arrester terminals.

After the transient event subsides, the varistor elements return to their normal high-resistance operating condition.

This process helps reduce the electrical stress imposed on the insulation of connected equipment.

Applications

Depending on the electrical ratings and system design, the 6kV distribution type surge arrester may be considered for:

• Medium-voltage distribution networks

• Distribution transformer protection

• Electrical switchgear protection

• Distribution substations

• Industrial power distribution systems

• Power distribution transformers

• Current transformer and voltage transformer protection

• Capacitor equipment protection

• Overhead distribution equipment

• Electrical insulation coordination projects

Product Structure

Visible external components include:

• Ribbed insulating housing

• Upper metal terminal

• Lower metal terminal

• Metal end fittings

• External insulating sheds

• Internal zinc oxide varistor elements

The internal construction and housing material should be verified against the detailed product drawing and manufacturing specification.

How to Select the Right Model

Selecting between YH5WS-7.6/30 and YH5WS-10/30 requires an evaluation of the electrical conditions of the distribution system.

Important factors include:

1. Nominal and maximum system voltage

2. System grounding arrangement

3. Temporary overvoltage conditions

4. Required arrester rated voltage (Ur)

5. Continuous operating voltage (Uc)

6. Insulation withstand level of protected equipment

7. Lightning and switching surge conditions

8. Installation environment and terminal requirements

The two models should not be treated as interchangeable solely because both are listed for a 6kV nominal system.

FAQ

Q1. What is a 6kV distribution type surge arrester?

It is a metal oxide surge protection device designed for compatible 6kV nominal distribution system applications. It helps limit transient overvoltages caused by lightning and switching operations.

Q2. What is the difference between YH5WS-7.6/30 and YH5WS-10/30?

The two models have different rated and continuous operating voltages:

• YH5WS-7.6/30: Ur 7.6kV, Uc 4.0kV.

• YH5WS-10/30: Ur 10kV, Uc 8.0kV.

The appropriate model should be selected according to system grounding and overvoltage conditions.

Q3. What does 7.6/30 mean in the model designation?

In the model designation, 7.6 refers to the arrester rated voltage in kV, while 30 refers to the nominal lightning impulse residual voltage level in kV.

Q4. What is the continuous operating voltage (Uc)?

Uc is the maximum power-frequency voltage that can be continuously applied across the arrester terminals under the specified operating conditions.

Q5. Can this arrester be used for transformer protection?

Yes, it can be considered for compatible distribution transformer protection applications when its electrical ratings and protective characteristics meet the system requirements.

Q6. What technical information should be provided for selection?

Please provide the system voltage, grounding arrangement, required Ur and Uc, installation conditions and protected equipment insulation requirements.

Q7. Can DGG provide technical documentation?

Available product specifications, drawings and test documentation can be confirmed according to the exact model and project requirements.

Looking for a 6kV Distribution Type Surge Arrester?

Choosing the right surge arrester requires careful consideration of rated voltage, continuous operating voltage, residual voltage and system grounding conditions.

DGG offers YH5WS-7.6/30 and YH5WS-10/30 configurations for compatible 6kV nominal system applications.

Send us your technical requirements or equipment specifications. Our team can help review the appropriate model for your project.

Contact DGG Power for Technical Specifications and Quotation.