Views: 0 Author: Site Editor Publish Time: 2026-05-27 Origin: Site
Reliable operation of a 35kV substation depends not only on the quality of the main equipment, but also on proper installation, mechanism adjustment, secondary circuit verification, and on-site commissioning before operation.
In this project, DGG Power provided technical support for the installation and commissioning of a 35kV outdoor high-voltage AC vacuum circuit breaker at a substation. The project site is located in a high-altitude area of nearly 2,000 meters above sea level, where equipment reliability, insulation performance, and mechanical operation stability are especially important.
This case demonstrates DGG Power’s capability to support medium-voltage substation projects with reliable outdoor vacuum circuit breaker products, practical field experience, and professional on-site service.
Project Summary
Project type: 35kV outdoor vacuum circuit breaker installation and commissioning
Application site: 35kV substation in a high-altitude area
Main equipment: 35kV outdoor high-voltage AC vacuum circuit breaker
Working environment: Outdoor substation, approximately 1,950–2,000m altitude
Key work: Equipment positioning, mechanism inspection, secondary circuit checking, on-site adjustment, and commissioning preparation
Project value: Improved switching reliability, feeder protection capability, and long-term substation operation stability
Project Background: 35kV Substation Equipment Upgrade
In a 35kV substation, outdoor vacuum circuit breakers are key switching and protection devices. They are responsible for switching load current and interrupting fault current, helping protect feeder circuits and maintain stable power supply.
For substations located in mountainous or high-altitude regions, equipment must maintain reliable performance under more demanding environmental conditions. Reduced air density, outdoor exposure, temperature variation, and site operation requirements all place higher demands on equipment design and commissioning quality.
The purpose of this project was to complete on-site installation support and commissioning preparation for a 35kV outdoor vacuum circuit breaker, ensuring that the equipment could meet operational requirements before being put into service.
On-Site Installation and Safety-Controlled Work Area
The photos show the breaker installed in the high-voltage equipment area of a 35kV substation. Temporary safety barriers, warning signs, insulated support structures, overhead conductors, and existing substation equipment can be clearly seen on site.
These conditions indicate that the work was carried out under controlled construction and safety management procedures.
For substation projects, safety-controlled site preparation is essential. It helps ensure that installation, adjustment, inspection, and testing work can be performed in an organized and compliant manner.
Mechanism Inspection and Adjustment
Several photos show the operating mechanism cabinet opened for inspection. Internal components such as the operating mechanism, closing and opening indicators, control buttons, auxiliary switches, terminal blocks, and control wiring areas are visible.
This stage is critical because the operating mechanism directly affects the circuit breaker’s opening and closing reliability.
During commissioning preparation, engineers usually focus on:
Mechanical linkage condition
Opening and closing operation reliability
Auxiliary switch position feedback
Control circuit connection
Terminal wiring and secondary circuit verification
Local operation and indication status
A properly adjusted mechanism helps ensure that the breaker can respond accurately during normal switching and fault interruption.
Why High-Altitude Substation Applications Require More Attention
The project site is located at an altitude close to 2,000 meters. In high-altitude areas, electrical equipment may face different operating challenges compared with low-altitude environments.
For outdoor circuit breakers, high-altitude applications require attention to:
Insulation coordination
Creepage distance and external insulation performance
Mechanical operation stability
Outdoor weather resistance
Long-term reliability under site conditions
Although altitude conditions vary by project, equipment selection and commissioning should always consider the actual operating environment.
For customers working on mountain area substations or high-altitude power distribution projects, choosing suitable outdoor vacuum circuit breakers and reliable commissioning support is essential.
The Role of 35kV Outdoor Vacuum Circuit Breakers
A 35kV outdoor vacuum circuit breaker is commonly used in substation feeder circuits, overhead distribution systems, and medium-voltage power networks.
Its main functions include:
Switching normal load current
Interrupting short-circuit fault current
Supporting feeder protection
Improving power supply reliability
Supporting safe operation and maintenance of the substation
In medium-voltage substations, the circuit breaker is one of the most important devices for maintaining system safety and operational continuity.
DGG Power’s Field Service and Project Support Capability
For DGG Power, project delivery is not limited to equipment manufacturing. Reliable operation also depends on proper installation support, mechanism adjustment, secondary circuit checking, and commissioning cooperation.
In this project, DGG Power’s technical team supported the site work by helping verify the breaker mechanism, control system, and installation readiness before operation.
This reflects DGG Power’s project support capability in:
Outdoor vacuum circuit breaker supply
Substation equipment installation support
Mechanism adjustment and inspection
Secondary circuit checking
Medium-voltage project commissioning support
High-altitude substation application experience
For utilities, EPC contractors, and power distribution operators, this type of support helps reduce project risk and improve equipment operation reliability.
A 35kV outdoor vacuum circuit breaker is used in medium-voltage substations and distribution networks to switch load current, interrupt fault current, and protect feeder circuits.
Mechanism adjustment ensures that the breaker can open and close reliably. It helps verify the operating mechanism, auxiliary switches, control buttons, and secondary wiring before the equipment is put into service.
Typical checks include mechanical operation, opening and closing indication, secondary circuit wiring, auxiliary switch feedback, insulation condition, control power, and site installation status.
High altitude can affect external insulation performance due to lower air density. For outdoor electrical equipment, insulation coordination and site operating conditions should be considered during selection and commissioning.
DGG Power provides outdoor vacuum circuit breaker products and field service support for medium-voltage substation projects, including installation support, mechanism inspection, and commissioning assistance based on project requirements.
A successful 35kV outdoor vacuum circuit breaker project is not only about installing the equipment. It also requires careful site preparation, mechanism adjustment, secondary circuit verification, and commissioning support.
Through this high-altitude substation project, DGG Power demonstrated its ability to support medium-voltage power infrastructure with reliable outdoor vacuum circuit breaker products and professional field service capability.
Looking for a 35kV outdoor vacuum circuit breaker solution for your substation project? Contact DGG Power to discuss your voltage level, site conditions, installation requirements, and commissioning support needs.
