Views: 0 Author: Site Editor Publish Time: 2026-06-10 Origin: Site
Project Overview
A reliable 35kV substation bay requires more than a single electrical device. It depends on the proper coordination of outdoor switching equipment, steel support structures, insulation components, conductors, operating mechanisms, and commissioning work.
In this project, DGG Power supported a 35kV substation bay construction project with outdoor high-voltage disconnect switch equipment and on-site technical service. The work included equipment installation, steel structure assembly, conductor connection, operating mechanism adjustment, and commissioning preparation.
This project demonstrates DGG Power’s capability to provide medium-voltage substation equipment and project-based support for utilities, EPC contractors, industrial users, and distribution network operators.
Project Summary
Project type: 35kV substation bay construction
Main equipment: Outdoor high-voltage disconnect switch / outdoor isolating switch
Application: Medium-voltage substation switching and visible isolation
Site work: Equipment installation, steel support structure assembly, conductor connection, operating mechanism adjustment, and commissioning preparation
Project value: Safer maintenance isolation, reliable switching operation, improved bay structure, and better substation operation readiness
Service scope: Product supply, installation support, commissioning assistance, and project-based technical service
Building a Reliable 35kV Substation Bay
In a 35kV substation, each bay functions as an important unit for power distribution, switching operation, equipment isolation, and grid reliability. A complete bay may include disconnect switches, circuit breakers, instrument transformers, surge arresters, busbars, conductors, support structures, and operating mechanisms.
For substation projects, the quality of installation directly affects long-term operation. Proper equipment positioning, accurate mechanical alignment, reliable conductor connection, and sufficient insulation clearance are all important for safe operation and maintenance.
The goal of this project was to complete the construction and commissioning preparation of a 35kV substation bay, ensuring that the outdoor disconnect switch and related equipment were ready for future operation.
Outdoor Disconnect Switch Installation
The outdoor disconnect switch is an important switching device in medium-voltage substations. It is mainly used to provide a visible isolation point when equipment or circuits need to be maintained.
Unlike circuit breakers, disconnect switches do not have a dedicated arc-extinguishing structure. Therefore, they are generally operated after the circuit has been de-energized by a circuit breaker. Their main value lies in visible isolation, operation safety, and maintenance support.
During outdoor disconnect switch installation, key factors include:
Equipment positioning and phase alignment
Steel structure stability
Reliable connection between conductors and terminals
Proper insulation distance and phase spacing
Smooth opening and closing movement
Mechanical linkage between the switch body and operating mechanism
Grounding and safety-related installation details
These steps help ensure stable operation and safer maintenance conditions for the substation bay.
Operating Mechanism Adjustment and Commissioning
Preparation
For outdoor disconnect switches, the operating mechanism must be accurately connected with the switch body. Smooth mechanical transmission and correct open-close positioning are essential for safe switching operation.
Before the equipment is put into service, engineers usually verify the following items:
Mechanical transmission condition
Opening and closing position accuracy
Locking mechanism status
Manual or motor-operated mechanism performance
Auxiliary contact and signal feedback, if applicable
Control box wiring and grounding condition
Operation consistency under field conditions
A properly adjusted mechanism helps reduce operation risk and improves the long-term reliability of the disconnect switch.
Why Disconnect Switches Matter in Substation Operation
Disconnect switches play a key role in substation operation and maintenance. Their main purpose is not to interrupt fault current, but to isolate equipment and create a clear visible open point after the circuit has been disconnected.
In medium-voltage substations, disconnect switches support:
Safe maintenance isolation
Visible disconnection points
Switching operation coordination
Equipment sectionalizing
Flexible operation of substation bays
Safer inspection and maintenance procedures
Because disconnect switches are closely related to operation safety, proper installation and correct operating procedures are especially important.
Substation Bay Construction and Project Coordination
A 35kV substation bay construction project usually involves multiple work stages, including foundation preparation, steel structure installation, primary equipment installation, conductor connection, secondary wiring, mechanism adjustment, and commissioning preparation.
To ensure smooth project execution, coordination between equipment suppliers, installation teams, commissioning engineers, and project owners is required.
For EPC contractors and power distribution operators, choosing a supplier with both product capability and project support experience can help reduce communication costs, improve installation efficiency, and support reliable project delivery.
DGG Power’s One-Stop Support for Medium-Voltage Substation Projects
DGG Power provides medium-voltage and high-voltage electrical equipment for power distribution and substation applications. In addition to equipment manufacturing, DGG Power can also support customers with project-based technical service.
For substation bay construction projects, DGG Power can provide related equipment and support, including:
Outdoor disconnect switches
Outdoor vacuum circuit breakers
Surge arresters
Current transformers and voltage transformers
Fuse cutouts
Medium-voltage switchgear
Substation bay equipment coordination
Installation and commissioning support
This integrated service capability helps customers complete substation projects more efficiently and supports long-term equipment operation.
Customer Search Questions This Project Answers
This project case is relevant to customers searching for:
How to build a 35kV substation bay?
What equipment is used in a 35kV substation bay?
How to install an outdoor disconnect switch?
What is the function of a disconnect switch in a substation?
Outdoor isolating switch for medium-voltage substation
Substation equipment supplier with commissioning support
35kV outdoor disconnect switch installation
Medium-voltage substation bay equipment supplier
FAQ: 35kV Substation Bay and Outdoor Disconnect Switches
What is a 35kV substation bay?
A 35kV substation bay is a functional section of a substation designed for one circuit, feeder, transformer connection, or line connection. It usually includes switching, protection, measurement, insulation, and conductor connection equipment.
What is the function of an outdoor disconnect switch?
An outdoor disconnect switch provides a visible isolation point for maintenance and switching operations. It is generally operated after the circuit has already been disconnected by a circuit breaker.
Can a disconnect switch interrupt fault current?
No. A disconnect switch does not have a dedicated arc-extinguishing structure and should not be used to interrupt load current or short-circuit current. It should be used according to proper switching procedures.
What should be checked during disconnect switch commissioning?
Key checks include mechanical operation, open and closed position accuracy, conductor connection, phase spacing, insulation clearance, grounding, control box wiring, and operating mechanism condition.
Can DGG Power support complete substation bay projects?
Yes. DGG Power can provide medium-voltage electrical equipment and project support, including product supply, installation support, commissioning assistance, and technical service based on project requirements.
Conclusion
A 35kV substation bay construction project requires more than equipment supply. It requires correct installation, mechanical adjustment, conductor connection, safety management, and commissioning preparation.
Through this project, DGG Power demonstrates its capability in outdoor disconnect switch applications and medium-voltage substation project support.
Looking for 35kV outdoor disconnect switches or substation bay equipment for your project? Contact DGG Power to discuss your voltage level, site conditions, installation requirements, and technical specifications.
