Hall open loop current sensor installed without power outage

Description :

Hall open loop current sensor installed without power outage

　　1.1 Structural Features Hall open loop current sensor installed without power outage

　　The open type Hall current sensor is developed based on the traditional closed type Hall current sensor, with a novel structure and a beautiful and elegant appearance. The overall structure consists of a shell, iron core, sampling circuit board, and fixed resin. The shell material is made of PC/ABS alloy, which has the characteristics of high temperature resistance, high mechanical strength, and environmental protection; The iron core adopts oriented cold-rolled silicon steel sheets, which have the characteristics of stable performance, high mechanical strength, and extremely high magnetic permeability; The circuit board and external wiring use green pluggable terminals, making on-site wiring convenient and reliable.

　　1.2 Working principle

　　Hall current sensor is a type of sensor designed based on the Hall effect and electromagnetic induction principle. It can be divided into open-loop (DC amplifier) and closed-loop (magnetic balance) modes according to the principle. The open-loop Hall current sensor is an improvement on the traditional open-loop (DC amplifier) Hall sensor, which is different from the traditional single iron core and single Hall chip design. In order to design a split structure, the iron core is separated and symmetrically installed, and the hardware uses dual Hall chips in parallel complementary differential input.

　　When the primary current IP flows through a long wire, a magnetic field is generated around the wire, and the magnitude of the magnetic field is proportional to the current flowing through the wire. The generated magnetic field is concentrated in the magnetic ring and measured by two Hall elements in the air gap of the magnetic ring. The two Hall elements are placed opposite each other in the same magnetic field, and the output signal has complementary characteristics. The output voltage is amplified by differential amplification, which can not only suppress common mode interference but also the influence of temperature drift. The output voltage VS reflects the primary current IP. The general rated output is calibrated as DC ± 5V or DC4-20mA.

　　1.3 Product Installation

　　Taking square hole products as an example, open the installation screw of the open type Hall current sensor and remove the lower body of the sensor; Install the upper body of the open-ended Hall current sensor into the primary busbar of the power distribution system, close the lower body of the sensor, thread the installation screws and washers of the sensor through the fixing holes of the upper and lower bodies, and fix the upper and lower bodies of the sensor together. If the on-site installation can be powered off, two corresponding threaded holes can be opened on the bronze plate according to the sensor spacing requirements, and the sensor can be fixed on the threaded hole of the busbar through the rear installation fixing hole to complete the installation of the sensor; If on-site electrical installation is required, a matching rubber pad can be embedded between the housing and the bronze plate to ensure reliable operation of the sensor even under vibration conditions. The entire installation process is relatively fast and simple.

　　1.4 Advantages of Open Hall Sensors

　　Compared with traditional DC current measurement methods that generally use splitters or transformers, open-ended Hall sensors have the following advantages:

　　1) The insulation strength of the primary and secondary sides is high, and can achieve AC12kV isolation;

　　2) No insertion loss;

　　3) Good dynamic performance: response time less than 20us, tracking speed di/dt higher than 20A/us;

　　4) During installation, there is no need to dismantle the original cables or busbars, making it particularly suitable for renovation construction of equipment that does not allow power outages.

　　2、 Application of Open Hall Current Sensor

　　Open type Hall current sensors are mainly used in factory renovation of DC distribution systems, such as power plant DC power supply system renovation, substation DC system renovation, communication room renovation, railway locomotive renovation and other projects. It can convert the original DC current signal in the system into standard DC ± 5V or 4-20mA output, playing a monitoring and electrical isolation role, and can be used in conjunction with multi circuit monitoring instruments or other electrical measuring instruments.

　　2.1 Application Examples

　　From the perspective of renovation costs, if traditional closed type Hall sensors or splitters are used, during construction, the copper busbar of the DC bus must be dismantled first, the sensor must be installed, and then the busbar must be reinstalled and restored. During the entire installation process, at least two construction personnel are required to cooperate with the construction, and the rectification of the line must be carried out with power outage cooperation; If the open type Hall sensor scheme is adopted and installed using the installation method described in 1.3, only one construction worker is required, and the construction time is expected to be only 1/20 of the traditional scheme. The power outage time in the factory can also be reduced accordingly, and in some cases, the construction and installation can be carried out without electricity. Adopting this scheme significantly saves time, effort, and labor. Compared with the purchase price of closed type Hall sensors, the purchase price of open type Hall sensors with the same opening shape is slightly higher by about 10%. From the perspective of testing performance, as long as the upper and lower body screws of the sensor are tightly fixed during installation, the accuracy and stability of the open sensor and the closed sensor are basically the same.

　　Based on the above comparison, whether considering the advantages of on-site construction or the overall cost of procurement and construction for project renovation, using an open type Hall current sensor is undoubtedly an affordable solution.

　　Taking the DC distribution cabinets of many domestic enterprises as an example, multiple DC inputs are combined into one current output, each with protection devices (circuit breakers, fuses, etc.), anti reverse diodes, etc., and each voltage and current can be monitored, and remote communication can be achieved. Using 8 open-ended Hall current sensors to monitor DC current, the layout is beautiful, more convenient to install compared to traditional Hall sensors, and safer and more practical compared to shunt solutions.

　　The DC distribution system is usually composed of high-frequency switching power supplies and batteries, which are used to provide reliable DC power for control, signal, relay protection, automatic devices, emergency lighting, etc. in the DC system. It has high requirements for the reliability, stability, and quality of its power supply. Therefore, it is urgent to carry out corresponding modifications to certain DC systems that have been in service for a long time. Moreover, during the renovation of the DC system, there is no power outage, which makes the engineering renovation difficult. Traditional closed Hall current sensors or splitters cannot solve this problem. Therefore, open Hall current sensors are used to solve the DC current measurement problem in the renovation project, ensuring uninterrupted and safe operation during the renovation process.

　　Jiangsu Ankerui Electric Manufacturing Co., Ltd. is a wholly-owned subsidiary of Ankerui Electric Co., Ltd. (code: 300286. SZ) with a registered capital of 91.8602 million yuan. It is a high-tech enterprise in Jiangsu Province that integrates research and development and production.

　　The first phase of the company's factory was completed and officially put into use in June 2006, with a factory area of 10000 square meters. It is an enterprise in the intelligent power instrument industry that adopts lead-free production technology, providing a guarantee for the industrialization and scale implementation of the company's products. In March 2010, the company underwent a technological upgrade and carried out anti-static renovations in the workshop, further improving the production environment and enhancing product competitiveness, while also providing conditions for the entry of the Ankerui brand into the market.

　　Jiangsu Ankerui has introduced MES management system in production, with barcode scanning for each process, enabling control of the entire production schedule and process. Basically achieved paperless management, saved production costs, and improved management efficiency.

　　Ankerui Pan Qin

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• Open ended open-loop current sensor