Retrofit the pole-mounted circuit breakers and ring main units（RMU） to enable old equipment to also be connected to the power monitoring system.

RW Energy 10/08/2025

In 2016, The State Grid first proposed the concept of distribution primary and secondary integration technology. The core of this technology lies in the in-depth integration and collaborative design of primary equipment (such as switchgear, circuit breakers, transformers, etc.) and secondary equipment (such as distribution terminals DTU/FTU, protection devices, communication modules, etc.), ultimately realizing functional integration, information sharing, and intelligent control of the distribution network system.

With the acceleration of the intelligentization process in the power industry, pole-mounted circuit breakers and ring main units in most provinces and cities across China have gradually completed primary and secondary integration transformation and been connected to the system. However, there are still a number of old circuit breakers and ring main units in some regions. These devices have long been in a state of "operating in isolation" due to their failure to connect to the State Grid system platform, unable to exert collaborative management and control functions, thus becoming a bottleneck in the automation upgrade of the distribution network.

To address this pain point, Zhejiang Rockwell Energy Technology Co., Ltd. has carried out targeted wireless communication "three-remote" (telemetry, remote signaling, remote control) transformation based on the unified standards for the construction of distribution automation systems. This transformation has successfully opened up the connection channel between old equipment and the State Grid system, allowing these "power warriors" to re-integrate into the power grid system and achieve "joint operations".

Core Advantages after Transformation

Significant Improvement in Fault Handling Capability

The transformed equipment can quickly and accurately locate faults in the distribution network, and automatically complete fault isolation operations at the same time. This greatly shortens the fault handling time, effectively improves the efficiency of power supply restoration, and reduces the impact of power outages on users.

Intelligent Upgrade of Operation and Maintenance (O&M) Experience

The equipment is equipped with a new integrated operating status monitoring function: during the operation of the equipment, it can intuitively display operating data through a graphical interface, complete fault diagnosis with intelligent algorithms, and provide scientific O&M guidance. This function helps O&M personnel accurately grasp the equipment status, significantly improving the efficiency and precision of O&M work for power supply lines.

Achievements of Transformation Implementation

Since the technical solution was implemented, the transformation projects of Zhejiang Rockwell Energy have achieved large-scale application, and their operational stability has been recognized by the industry:

In 2022, the company carried out "three-remote" transformation of wireless encrypted communication, completing the transformation of over 3,000 FTU controllers in total, which has been well received by the O&M departments of various power supply companies;

From January to October 2023, the scale of transformation was further expanded, with the transformation of over 5,000 FTU controllers completed. The equipment has maintained stable operation and continuously met the O&M needs of the distribution network;

From January to July 2024, the company continued to advance the transformation work, completing the transformation of over 3,000 FTU controllers. The practicality and reliability of the technical solution have been continuously verified.

Display of some successful cases：

old devices recycle