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Project Background   In the power system, the harmonic problem has been plaguing many projects, and the active filter cabinet we recently customized for the technical building and tower project of Guinea-Bissau Airport has become a key weapon to overcome this problem.   The Guinea-Bissau Airport project is of great significance to the country. The construction of its technical building and tower requires a stable, reliable and high-quality power supply system. However, various advanced equipment in the airport will generate harmonics during operation. If these harmonics are not managed, they will not only affect the normal operation of the equipment, but may even cause power grid failures, seriously threatening the operational safety of the airport.   The active filter cabinet we customized for the project's needs uses advanced power electronics technology and intelligent control systems. It can monitor the grid current in real time, accurately analyze the harmonic components therein, and quickly generate compensation currents equal to the harmonics and opposite in direction, thereby effectively filtering out the harmonics. This process not only improves the power quality, but also provides more stable and reliable power support for airport equipment.   What is "active power filter cabinet"?   Active power filter cabinet (APF) is an intelligent harmonic control device based on power electronics technology. It detects harmonic currents in the power grid in real time, dynamically generates reverse compensation current, accurately offsets harmonic pollution, and solves power quality problems such as voltage fluctuations and three-phase imbalance.   Compared with traditional passive filters (LC filters), active power filter cabinets have the characteristics of strong adaptability, fast response speed, and high filtering efficiency. They are especially suitable for modern industrial scenarios with high proportion of nonlinear loads and complex harmonics.   Why choose active power filter cabinet?   Full-band harmonic control Covering 2-50 harmonics, the compensation rate is as high as 97%, which completely solves the harmonic interference generated by inverters, rectifiers, medium frequency furnaces and other equipment. Dynamically track load changes and respond at milliseconds to avoid over-compensation or under-compensation caused by fixed parameters of traditional equipment.   Multifunctional integrated design Integrated harmonic control, reactive power compensation, and three-phase unbalanced regulation functions, one machine with multiple effects, reducing equipment investment costs. Supports parallel expansion and flexible adaptation to different capacity requirements (from 50A to 600A).   Intelligent monitoring and protection Built-in Internet of Things module, supports remote monitoring, data recording and fault warning, and can view power quality reports in real time through PC/mobile phone. Equipped with multiple protection mechanisms such as overcurrent, overvoltage, undervoltage, and overheating to ensure long-term stable operation of the equipment.   Green energy saving and compliance Reduce line losses caused by harmonics, improve power efficiency by 5%-15%, and help enterprises save energy and reduce consumption. Comply with international and domestic power quality standards such as IEEE 519 and GB/T 14549 to avoid the risk of power fines.   Which industries need it?   Manufacturing industry Typical loads: inverters, robots, CNC machine tools, electroplating power supplies Problems: Harmonics cause equipment false alarms, motor heating, and product yield fluctuations   Data centers and communication base stations Typical loads: UPS power supplies, servers, precision air conditioners Problems: Harmonics cause IT equipment downtime, capacitor bulging, and backup power failure   Commercial buildings and medical fields Typical loads: LED lighting, elevators, MRI magnetic resonance imaging devices Problems: Harmonics cause lighting flickering, elevator jitter, and reduced accuracy of medical imaging equipment   New energy and rail transit Typical loads: photovoltaic inverters, charging piles, traction power supply systems Problems: Harmonics cause grid connection anomalies, low charging efficiency, and contact network resonance   Welcome to consult The Guinea-Bissau Airport project is just one of our many successful cases. In the future, we will continue to deepen our active filtering field, continuously optimize product performance, expand the scope of application, solve harmonic problems for more industries and projects, and contribute to the improvement of global power quality.

Project background: In textile mills, air compressors are one of the indispensable equipment. Whether it is the pneumatic conveying of the cotton cleaning machine or the weft insertion system of the air jet loom, it is inseparable from the support of compressed air. However, traditional air compressor control methods often have many disadvantages, such as high energy consumption, large pressure fluctuations, and difficult maintenance. These problems not only affect the production efficiency of textile mills, but also increase the operating costs of enterprises. And our electrical control cabinet was born to meet this demand. It integrates advanced control technology, monitoring technology and protection technology, and can achieve precise control, real-time monitoring and comprehensive protection of air compressors, so that air compressors can operate in the best state, providing strong guarantee for the production of textile mills.   Actual combat case Customer background: A textile group has 8 branches, with a total installed power of air compressors of 3000kW and annual electricity bills exceeding 20 million yuan. Pain points: Multiple air compressors operating independently lead to pressure fluctuations and increased fabric defect rates; equipment maintenance relies on manual records, and the average repair time for faults exceeds 4 hours. Solution:We customized an intelligent air compressor group control system for it, and the core configuration includes: Main control unit: Siemens S7-1500 series PLC is used to achieve linkage control of 6 air compressors; Variable frequency drive: ABB ACS880 inverter dynamically adjusts the motor speed, and the pressure bandwidth is compressed to ±0.05MPa; Cloud-edge collaboration: The edge computing gateway collects 200+ parameters in real time, and the data is uploaded to the Alibaba Cloud IoT platform; Energy efficiency management: Predict gas demand through AI algorithms, automatically start and stop equipment combinations, and avoid "big horses pulling small carts". Results: Energy saving of 32%: annual electricity bill savings of 6.4 million yuan, with an investment payback period of only 18 months; Efficiency increased by 15%: fabric defect rate decreased by 0.8%, and the rate of high-quality products increased to 98.2%; Operation and maintenance costs reduced by 40%: predictive maintenance reduced unplanned downtime, and spare parts inventory turnover increased by 3 times.   Cooperation From single-machine control to intelligent production lines, from equipment suppliers to energy efficiency managers, we have always taken "making air compressors better understand textiles" as our mission. Whether you are: A growing company that wants to upgrade old air compressor stations An industry leader planning a new digital workshop An industrial park seeking EPC general contracting services We can provide one-stop services from solution design → equipment deployment → energy efficiency verification → operation and maintenance hosting. ,   How can our electrical control cabinets help textile mills cope with the challenges of peak production? A1: During peak production, the demand for compressed air in textile mills will increase sharply. Our electrical control cabinet uses intelligent algorithms to monitor the gas demand of the production line in real time, and automatically adjusts the operating status of the air compressor to ensure stable gas supply.   In terms of energy conservation and emission reduction, what are the specific performances of our electrical control cabinet? A2: Our electrical control cabinet adopts advanced frequency conversion technology and optimized control strategy, which can dynamically adjust the operating speed of the air compressor according to the actual gas demand to avoid unnecessary energy waste. Take a large textile group as an example. After introducing our intelligent air compressor group control system, the annual electricity bill savings reached 6.4 million yuan, and the investment recovery period was only 18 months.

What does HVAC mean? HVAC is an abbreviation for "heating, ventilation, and air conditioning." A residential HVAC system is a complete home comfort system that heats and cools your home, improves indoor air quality, and controls humidity. There are many different types of HVAC systems. They can include individual components such as air conditioning units, heat pumps, air handlers, furnaces, air purifiers, humidifiers, and dehumidifiers.   What is HVAC Control? The definition of an HVAC control system can vary depending on the purpose, whether it is a simple residential system or a very complex large system. But in general, an HVAC controller is defined as a device that regulates the operation of heating, ventilation, and air conditioning equipment. Typically, a home will have a thermostat connected to a standalone air conditioner. You can manage the operation of that standalone unit by modifying the temperature (or set point). For example, setting the thermostat to 75 degrees Fahrenheit in the summer will cause the air conditioner to run until the room reaches that temperature. In this simple example, your thermostat is both a sensor and an HVAC controller because it senses the temperature of your home. We will talk more about sensors as we explore more complex systems. When applied to larger facilities, HVAC control can sometimes become part of a larger system called building automation or energy management system.   How is the HVAC switchboard controlled? Multi-branch power distribution The busbar system is used to distribute the input power (usually three-phase 380V/220V) to multiple branches to provide independent power supply circuits for HVAC components such as compressors, fans, pumps, cooling towers, etc. For example, a precision switchboard can support up to 84 feeder circuits to meet the power distribution needs of complex systems. Branch circuit measurement is achieved through high-precision current transformers (CTs) with an error as low as ±1%, ensuring the accuracy of power distribution.   Four-level circuit protection system Short circuit/overload protection: built-in circuit breakers (such as frame circuit breakers, molded case circuit breakers) cut off the circuit within 0.1 seconds when the current is abnormal (such as short circuit current reaches more than 10 times the rated value). Leakage protection: cooperate with the leakage collection unit, trigger alarm and power off when the ground leakage current is ≥30mA. Phase sequence protection: detect the imbalance of three-phase voltage (act when it exceeds 15%) to prevent the motor from burning. Overvoltage/undervoltage protection: automatically trip when the voltage fluctuation exceeds ±10% of the rated value to protect sensitive electronic equipment.   Equipment-level control Contactor matrix: the start and stop control of fans and water pumps is realized through the contactor combination. The contactor coil voltage is usually AC220V, and the contact capacity covers 10A-630A. Variable frequency drive integration: The built-in variable frequency drive (VFD) adjusts the compressor and fan speed. For example, the vector control technology is used to adjust the fan speed steplessly within the range of 300-1500rpm, reducing energy consumption by 30%-50%.   Environmental parameter linkage control Temperature and humidity coupling adjustment: Receive the temperature and humidity set values ​​issued by the BAS system (such as 26℃/50%RH in summer and 20℃/40%RH in winter), and dynamically adjust the cold and heat source output through the PID algorithm. Air quality linkage: According to the CO₂ sensor (range 0-2000ppm) or PM2.5 detection data, the fresh air valve opening (0-100% stepless adjustment) and the filter section operation mode are automatically switched.

Remote control: The solenoid valve group box can realize automatic adjustment of the gas source through remote control, which not only improves production efficiency, but also reduces the complexity of manual operation and ensures the continuous and stable operation of the production line. The intelligent control system can automatically adapt to production needs and realize dynamic adjustment of the gas source, providing strong support for the company's production optimization and cost control.   Timing control and sequence control: Modern solenoid valve control boxes have intelligent control functions, including remote control, timing control, sequence control, etc., which can flexibly meet different process requirements.   Automatic adjustment and fault warning: Combined with PLC time setting and sensor data, the system can automatically adjust the gas source flow and pressure, and trigger an alarm when the gas pressure fluctuates or the gas source is insufficient (as stated in the WeChat public platform "the intelligent monitoring system collects data in real time and automatically adjusts the state of the solenoid valve").   Data analysis and optimization: By collecting operation data, the system can analyze the efficiency of gas source use, optimize control strategies, and reduce energy waste (such as the WeChat public platform mentioned "avoid excessive gas supply and reduce energy costs").   Modularity and integration capability: The modular design supports functional expansion and is compatible with multiple communication protocols (such as HART, Profibus), which is convenient for integration with existing industrial systems (such as "modular design, compatible with traditional solenoid valves" in the Zhihu article).   Real-time feedback and protection function: Through sensors or limit switches, the working status of the solenoid valve is monitored in real time and fed back to the control system or operator. At the same time, it has overload and short-circuit protection functions to prevent circuit faults from damaging the solenoid valve and control equipment. Human-machine interface: Configure the human-machine interface (HMI) to facilitate operators to set parameters, monitor status and diagnose faults.   Data recording and display: Through the LCD display or communication interface, the working status of the solenoid valve is displayed in real time, and it has data recording function, which is convenient for fault diagnosis and maintenance.   Multi-channel control: Supports centralized control of multi-channel solenoid valves. One control box can manage multiple solenoid valves at the same time, simplifying the design and maintenance of the system.   Flexible installation method: Modular design, easy installation, support for multiple installation methods such as wall-mounted and floor-standing, adapting to the on-site space layout.   Service and Support: We provide one-stop services from design, manufacturing, installation to commissioning, as well as comprehensive after-sales service and technical support to ensure the stable operation and production efficiency of pharmaceutical plant equipment. During the implementation phase, the project team conducted comprehensive testing to ensure seamless interoperability between components. In the end, we created a responsive control system that not only meets the stringent requirements of biopharmaceutical production, but also improves overall operational efficiency. By simplifying the control architecture, the new system reduces the possibility of human error, speeds up troubleshooting, and minimizes downtime.

The power distribution cabinet we custom-designed for the mall is able to precisely control and monitor power throughout the mall. The core function of the power distribution cabinet is an advanced intelligent control module. This module continuously collects real-time power consumption data from various areas of the mall, such as different floors, individual shops, and public facilities. It uses complex algorithms to analyze this data to optimize power distribution in real time.   For example, during peak shopping hours, when the mall has a large number of customers and lighting, air conditioning, and other power systems are running more frequently, the intelligent control module automatically adjusts power resources to meet the growing demand in high-traffic areas. Conversely, during off-peak hours, it reduces power supply to non-essential areas, significantly improving energy efficiency.   The power distribution cabinet also integrates a comprehensive safety monitoring system. Multiple sensors are installed throughout the unit to detect potential electrical hazards such as overheating, short circuits, and abnormal current fluctuations. If any problem occurs, the system will immediately trigger an alarm and automatically cut off the power supply to the affected area, preventing potential electrical fires and ensuring the safety of the mall infrastructure and its personnel.   In addition to its safety and optimization features, the power distribution cabinet is easy to maintain and has future scalability. The modular design allows for quick replacement of components in the event of a failure, minimizing downtime. In addition, as Tex Mall plans to expand in the future, the cabinet can be easily upgraded or modified to accommodate additional power loads.

How medical institutions in Honduras use distribution cabinet infrastructure to improve efficiency. Medical institutions across Honduras have achieved unprecedented operational efficiency improvements after adopting advanced three-phase medical IT isolation transformer distribution cabinets. The distribution cabinet is designed to eliminate power-related interruptions in intensive care environments.   What is medical IT isolation power supply? Medical IT isolation power supply is generally placed in the operating room ICU. In such a special environment, its working principle is as follows: our mains TN neutral grounding system, after passing through the isolation power supply, the output power will become an IT ungrounded system, so that even if the power supply through the isolation transformer is unidirectionally grounded, there will be no large leakage current. And it can make the entire operating room unsuitable for tripping due to leakage, and at the same time, these external fault currents will not enter the operating room to affect the safety of medical equipment and personnel. However, it is impossible for IT systems to completely eliminate insulation problems 100%, so such insulation monitors are needed (insulation monitoring of the system can be performed at the microampere level). If leakage is detected, an alarm will be issued through the alarm terminal. If there is a background, the alarm data can be uploaded to the background, which is convenient for the hospital to conduct overall monitoring and select transformers of different capacities according to the power load of the operating room.   How to greatly improve efficiency while ensuring safety? Say goodbye to unexpected downtime After the hospital installed it, the utilization rate of emergency generators decreased by 62%. The previous CT scanner had to be restarted 3-4 times a week during storms, but now it can run uninterruptedly.   Maintenance cycle shortened by 40% The built-in insulation fault locator can find problems in minutes (not hours). When an abnormality occurs, technicians will receive real-time alerts via SMS-no need to manually trace the circuit.   Equipment life extended by 20% By filtering out harmonic distortion and voltage spikes, the system prevents expensive medical equipment from premature wear. One clinic reported that the service life of its anesthesia machine was extended from 5 years to 7 years. Seamless integration with renewable energy The system is compatible with solar inverters and battery storage systems, allowing hospitals to adopt a hybrid model without sacrificing safety.   Benefits to the medical economy Cost savings: Save $18,000 in equipment repair costs each year. Improved productivity: Nurses spend 35% less time troubleshooting power failures, saving more than 1,200 hours of patient care each year. Reduced insurance premiums: Healthcare facilities equipped with IT isolation systems qualify for lower malpractice insurance rates due to their proven safety records.

Traditional ATS systems switch loads from main power to generators during power outages. Even a 10 millisecond power outage can cause server crashes, data corruption, or industrial machinery to stop. Integrate Eaton UPS into ATS cabinets to create an "uninterruptible" power bridge.   Adding Eaton UPS (uninterruptible power supply) to ATS cabinets has the following main functions:   Provide uninterruptible power supply: When the mains power fails, voltage fluctuates, frequency is abnormal, etc., Eaton UPS can switch to battery power mode in a very short time (such as some Eaton UPS can be within 4 milliseconds), ensuring that load equipment will not stop working due to mains power outages and ensuring business continuity. For example, in places such as data centers and hospitals, even short power outages can have serious consequences, and UPS can prevent this from happening.   Improve power quality: Eaton UPS has a high-precision voltage stabilization function. For example, the output voltage accuracy of Eaton 9SX series can be controlled within ±1%, and the frequency accuracy can be controlled within ±0.1Hz. It can also reduce the harmonic distortion rate of the output current through technologies such as built-in harmonic filters, provide pure and stable power for load equipment, and reduce the damage to equipment caused by power anomalies. For some precision instruments and electronic equipment that have high requirements for power quality, it can effectively avoid failures or damage caused by voltage instability, harmonics and other problems.   Enhance system reliability: UPS cooperates with ATS. When one power supply fails, ATS automatically switches to another power supply. If the other power supply also has problems, UPS can continue to supply power as a backup power supply, forming multiple guarantees. At the same time, Eaton UPS itself has high reliability, adopts advanced design and manufacturing technology, and some series also support redundant parallel function, which further improves the reliability of the entire power supply system.   Why add UPS to ATS cabinet? 1. Fill the ATS switching gap When ATS switches the main power supply (such as mains → generator), there is usually a millisecond power outage, and UPS can supply power through the battery at the moment of power outage to eliminate this gap and ensure the continuous operation of the load. 2. Dual redundancy protection ATS is responsible for the automatic switching of the main and backup power supplies, and UPS is responsible for uninterrupted power supply in a short period of time. The combination of the two forms a dual protection of "power switching + energy storage buffer" to avoid load interruption caused by switching delays or failure to start the backup power supply. 3. Optimize power quality UPS can filter voltage fluctuations, harmonics and other interferences in the power grid to provide stable power supply for the load, while ATS mainly solves the problem of power outages. The two functions complement each other. Adding UPS to the ATS cabinet is an effective means to improve power supply reliability. The core lies in eliminating power outage gaps and optimizing power quality through the dual mechanism of "power switching + energy storage buffer".

From life-sustaining ventilators to MRI machines, medical equipment requires stable, high-quality power to operate flawlessly. Yet hospitals often waste 20-30% of their energy because of poor power factor. Capacitor compensation cabinets can help optimize the grid, reduce energy costs, and protect critical patient care systems.   Why do hospitals waste energy? A hospital electrical system is like a water pipe. The electricity that flows through represents power (kVA), but only a portion of it does useful work (such as running a CT scanner). The rest is wasted energy. This waste is called reactive power and occurs when motors, transformers, and fluorescent lights generate magnetic fields instead of performing actual tasks.   The ratio of useful power to apparent power is called power factor (PF). A low power factor (less than 0.9) means your hospital is paying for energy it’s not using. Penalties are often charged for this inefficiency, driving up operating costs.   How capacitor compensation cabinets work: Real-time correction: Sensors detect power quality issues and automatically deploy capacitors to balance electrical loads. Power Factor Optimization: By providing reactive power locally, the system relieves stress on the grid and improves the power factor to ≥0.95. Harmonic Filtering: Advanced models protect sensitive medical electronics by eliminating distortion caused by devices such as variable frequency drives (VFDs).   Capacitor Compensation Cabinets are designed to meet these challenges and feature: IP54 protection rating: Dust and splash proof for tropical climates. Redundant Cooling: Quiet operation even at 40°C. Remote Monitoring: Alerts engineers via SMS when voltage fluctuates. Return on Investment: Reduced energy consumption, lower costs