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HANGZHI Shines in the All-DC Power Distribution Buildings

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Update time : 2021-12-23 15:57:26

Recently, 2021 Carbon Peak and Neutrality Forum and the 9th SHENZHEN International Low Carbon City Forum were held in Shenzhen, China. The DC power distribution demonstration project of the Future Building in Shenzhen International Low-Carbon City has received extensive attention from the guests. The building is the first full DC power distribution building in the five provinces of China Southern Power Grid. It was developed vigorously by the Shenzhen Power Supply Bureau of China Southern Power Grid in conjunction with Shenzhen Academy of Construction Sciences and other units. The technical integration scheme of high-efficiency energy storage + DC power distribution + flexible control" (called "optical storage direct and flexible"). It is estimated that the building can reduce carbon dioxide emissions by 1,675 tons per year, and the annual average energy consumption is 46.6% lower than that of an ordinary office building of the same area in Shenzhen.
There are many cutting-edge equipment "hidden" in the power control room and equipment room of the future building. Among them, the "DC Fault Arc Detection Module (AFDD) and DC Residual Current Detection Module (DC-RCD)" come from Shenzhen HANGZHI Precision Electronics Co., Ltd.



DC Fault Arc Detection Module (AFDD)
With the gradual increase in the capacity of the DC system, the complexity of the cable network and the diversity of load types will undoubtedly increase the difficulty of ensuring the safe, reliable and stable operation of the DC system. Arc faults due to loose connections and insulation damage are the most critical and most harmful threat in the field of DC power safety monitoring. DC fault arc current has no zero-crossing point, so it is easier to sustain combustion than AC arc, and it is easy to cause electrical fire under the condition of no one to monitor and protect, which seriously threatens the safety and stability of the DC system. The installation of a DC fault arc detection device can detect and protect the circuit in time when a fault arc occurs.

The arc fault detection device has obtained ideal arc fault detection test results under different conditions such as resistive load conditions, inverter load conditions, line-included impedance conditions, and system transient processes. The fault arc detection devices can detect the fault arc when occurs quickly and accurately without false tripping. The AFDD arc fault detection device is applied to the test of the fault arc detection function under the actual DC system, and the detection effect is still ideal, which can realize the efficient, economic, fast and accurate detection of the arc fault in multiple scenarios.
The DC Fault Arc Detection Module (AFDD) has the following characteristics:
1. AFDD realizes DC fault arc detection in multiple scenarios, with rich source load types and a wide range of applications;
2. More economical. By comparing the detection effects of different current sensors and the costs of hardware testing, a higher fault arc detection accuracy rate is achieved with a lower cost. At the same time, the volume is further reduced, which is beneficial to use with switch loads such as circuit breakers and inverters;
3. The detection response time is shorter and the detection accuracy rate is high. The average detection time is about 1s, which is far lower than the 2.5s required by the UL1699B standard; the detection accuracy is much higher than that of the market competitors, realizing efficient, fast and accurate arc fault detection.

DC Residual Current Detection Module (DC-RCD)

Electric shock caused by electric leakage, damage to power supply equipment and even fires have caused a large number of personal injuries and deaths and huge economic losses. Therefore, safe use of electricity has attracted more and more attention. The research on DC residual current protection technology is still in its infancy. The development of residual current detection products in the DC system has become an urgent need.


The DC-RCD scheme is a split scheme, in which the RCD main control unit and the current sensor unit constitute the product DC-RCD. When the DC-RCD detects a fault, it can output a dry contact pulse signal to drive the trip unit, and cooperate with the main circuit power supply to meet the matching requirements for the type of micro-break or molded case circuit breaker. The DC-RCD parameters can be set by the host computer.

The future building is not only a full DC building, but also the world's first full DC office building that goes out of laboratory to be in scale application. It is the deep integration of DC technology and green building technology. HANGZHI has the honor to participate in this great project, and it is a great honor.
Shenzhen Hangzhi Precision Electronics Co., Ltd. is a precision electronics company in the field of DC systems dedicated to the research and development, production, sales and program customization of high-precision DC sensors, voltage sensors, and high-precision electrical measuring instruments. HANGZHI is focused on technological innovation, provide users with precision control and high-efficiency energy-saving products and solutions, and jointly contribute to a green, low-carbon and sustainable future.

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