10kV Feeder Bay Upgrade with ZW32 Outdoor Vacuum Circuit Breaker | DGG Power

10kV Feeder Bay Upgrade with ZW32 Outdoor Vacuum Circuit Breaker | DGG Power Project Case

Reliable power supply in a distribution network depends not only on individual equipment performance, but also on the proper upgrading, installation, commissioning, and verification of key feeder bay devices.

In this project, DGG Power supplied ZW32 outdoor high-voltage AC vacuum circuit breakers and matching outdoor disconnectors for a 10kV feeder bay upgrade at a 35kV substation. The project involved equipment delivery, unpacking inspection, mechanism adjustment, secondary circuit checking, and preparation for final installation and commissioning.

This case demonstrates DGG Power’s ability to support medium-voltage substation upgrade projects with reliable equipment, traceable manufacturing information, and professional on-site technical support.

Project Background: Upgrading a 10kV Feeder Bay in a 35kV Substation

In a 35kV substation, the 10kV feeder bay plays an important role in distributing power to downstream users. Its switching and protection equipment directly affects fault isolation, feeder reliability, and overall power supply continuity.

The core task of this project was to replace or install key feeder bay equipment, including:

• Removal and preparation of existing equipment foundations

• Installation of new ZW32 outdoor vacuum circuit breakers

• Installation of matching outdoor disconnectors

• Mechanical adjustment and secondary wiring inspection

• Insulation testing and final acceptance before commissioning

Through this upgrade, the substation can improve switching reliability, strengthen feeder-side protection, and provide better support for daily operation and maintenance.

Equipment Delivery and Unpacking Inspection

After the equipment arrived on site, the outdoor vacuum circuit breakers and disconnectors were unpacked from wooden cases and placed in a temporary inspection area.

At this stage, the project team checked the product appearance, verified accessories, reviewed factory certificates and technical documents, and confirmed that the delivered equipment matched the project requirements.

For substation upgrade projects, unpacking inspection is not just a routine step. It helps ensure that every device is complete, correctly delivered, and ready for installation, reducing potential risks during later construction and commissioning.

Nameplate Data and Equipment Traceability

One of the key details observed on site was the product nameplate of the outdoor vacuum circuit breaker. The nameplate clearly displayed the product model, rated parameters, manufacturing information, and the applicable standard GB/T 1984-2024.

The equipment was also provided with a traceable QR code, supporting lifecycle information management and future operation records.

For power grid equipment, complete nameplate information and traceability are essential. They help operators verify technical data, manage equipment archives, and support maintenance activities throughout the service life of the product.

Mechanism Adjustment Before Installation

Before final installation, the circuit breaker mechanism box was opened for inspection and adjustment. The internal structure showed key components such as the spring operating mechanism, auxiliary switches, terminal blocks, and secondary wiring areas.

This step is critical because the operating mechanism directly determines the reliability of opening and closing operations.
A well-adjusted mechanism ensures that the circuit breaker can respond accurately during normal switching operations and fault interruption.

In medium-voltage feeder protection, reliable mechanical operation is not optional—it is the foundation of safe and stable power distribution.

Substation Site Conditions and Installation Preparation

The project was carried out in the high-voltage equipment area of a 35kV substation. The site included concrete support structures, disconnectors, instrument transformers, cables, safety barriers, warning signs, and temporary construction areas.

These site conditions indicate that the work was performed under controlled outage and safety management procedures.

Before the new equipment could be put into operation, the project required multiple steps, including foundation preparation, equipment positioning, mechanical linkage adjustment, secondary circuit connection, insulation testing, and acceptance verification.

Each step contributes to the final reliability of the upgraded feeder bay.

Why ZW32 Outdoor Vacuum Circuit Breakers Are Used in 10kV Distribution Systems

The ZW32 series outdoor vacuum circuit breaker is widely used in 10kV distribution networks, substations, outdoor switching stations, and overhead line systems.

It integrates a vacuum interrupter and operating mechanism, allowing it to switch normal load current and interrupt short-circuit fault current. In feeder bay applications, it helps isolate faults quickly and supports stable power supply to downstream distribution areas.

For utilities and power operators, upgrading feeder bay equipment with reliable outdoor vacuum circuit breakers can improve:

• Fault isolation capability

• Switching operation reliability

• Distribution network stability

• Operation and maintenance efficiency

• Power supply continuity for end users

This makes the ZW32 vacuum circuit breaker a key device in modern medium-voltage distribution systems.

DGG Power’s Project Delivery Capability

For DGG Power, project delivery is not limited to manufacturing and shipping equipment. A reliable substation upgrade requires coordination across product quality, documentation, traceability, site inspection, technical adjustment, and commissioning support.

In this project, DGG Power provided not only medium-voltage switchgear products, but also the technical support needed to help ensure smooth installation and reliable operation.

With standardized production, clear equipment traceability, and practical field service experience, DGG Power continues to support substations and distribution networks with dependable medium-voltage power distribution solutions.

Conclusion

A successful feeder bay upgrade depends on more than replacing old equipment. It requires reliable products, accurate technical data, careful on-site preparation, and professional commissioning support.

Through this 10kV feeder bay upgrade project, DGG Power demonstrated its capability to support medium-voltage substation modernization with ZW32 outdoor vacuum circuit breakers, outdoor disconnectors, and complete technical service support.

DGG Power remains committed to delivering reliable medium-voltage equipment and project support for substations, distribution networks, and power infrastructure worldwide.