Ensuring safe and high-quality power supply, centralized management, centralized maintenance, and centralized monitoring are the basic tasks of every professional maintenance personnel, and the following problems caused by power pollution are quite a headache.
1. Transient overvoltage and transient overvoltage
These electronic devices composed of large CMOS integrated components generally have the disadvantage of weak tolerance to transient overvoltage and overcurrent. Transient overvoltage will not only cause electronic equipment to malfunction, or cause electronic equipment to be disturbed, data Lost, or temporarily paralyzed; in severe cases, components will be broken down or the circuit board will be burned, and the entire system will be paralyzed.
2. Waveform distortion (or harmonics)
The components in the public power grid generate additional harmonic losses, reducing the efficiency of power generation, power transmission and transformation equipment. When a large number of 3rd harmonics flow through the neutral line, it will cause the line to overheat and even fire.
Affecting the normal operation of various electrical equipment, in addition to causing additional losses, can also cause the motor to produce mechanical vibration, noise and overvoltage, which is due to severe local overheating of the transformer, overheating of capacitors, cables and other equipment, insulation aging, shortening of life, resulting in damage. It will cause local parallel resonance and series resonance in the public power grid, thereby amplifying the harmonics, greatly increasing the aforementioned hazards, and even causing serious accidents. It will cause relay protection and automatic device malfunction, and make the measurement of electrical measuring instruments inaccurate. It will interfere with the adjacent communication system, the light one will produce noise, reduce the communication quality, and the serious one will lead to the loss of information and make the communication system unable to work normally.
3. Surge impact
When the surge exceeds the level that the computer can bear, the computer will appear garbled data, the chip will be damaged, and the components will be aged in advance, so the electrical equipment containing the microprocessor is easily damaged by the surge.
4. Three-phase voltage unbalanced
In production and domestic electricity use, when the three-phase load is unbalanced, the transformer is in an asymmetrical operation state, causing the loss of the transformer to increase (including no-load loss and load loss). According to the regulations of the transformer operation regulations, the neutral line current of the transformer in operation shall not exceed 25% of the rated current of the low-voltage side of the transformer, resulting in a decrease in efficiency, an increase in energy consumption, vibration, and output loss.
Three-phase four-wire connection method, when the three-phase load is balanced, the line loss is the smallest; when the one-phase load is heavy and the two-phase load is light, the line loss increment is small; when the one-phase load is small, the one-phase load is light, When the load of the third phase is the average load, the increase of line loss is larger; when the load of one phase is light and the load of two phases is heavy, the increase of line loss is the largest. When the three-phase load is unbalanced, regardless of the load distribution, the greater the current unbalance, the greater the line loss increment.
The technical definition of power quality drawn by the IEEE Technical Coordination Committee is: "Qualified power quality refers to the power provided to sensitive equipment and the grounding system set up to suit the normal operation of the equipment". With the rapid development of the electric power industry of the national economy, although the contradiction between the supply and demand of electric energy has been gradually resolved, due to the increasingly complex and diversified electricity loads, some have nonlinear, shocking, unbalanced characteristic loads and rich harmonics. The application equipment, such as semiconductor rectifier and inverter devices and power electronic devices such as frequency conversion speed control devices, will affect the power supply grid to varying degrees. According to my country's official statistics: in the past 20 years, major power accidents caused by power quality have been on the rise globally, and the annual national economic loss caused by power quality disturbance and electrical environmental pollution is more than 30 billion US dollars.
Nowadays, for the power supply department, users have put forward higher requirements for the reliability of power supply, and are more and more sensitive to the quality of power supply. Therefore, new requirements are constantly put forward for distribution networks and power suppliers. If the grid pollution cannot be effectively monitored and controlled, qualified power cannot be provided to users. Therefore, the power sector has made corresponding detailed regulations on the testing and governance of harmonics and the monitoring of other power events. In the field of communication, a large number of nonlinear load devices are currently used, including communication power supplies, UPS, diesel engines, high-power air conditioners (even inverter air conditioners), elevators, computers, and switches. Distortion, this reason also changes the quality of the power supply, causing harmonics and so on. At the same time, because the power supply in the field of communication is provided by the power system, it may cause three-phase power imbalance, including voltage fluctuations and power quality problems such as voltage surges and dips, which may cause the following hazards: It may cause relay protection and Malfunction of the automatic device directly endangers the safe operation of the power supply; additional loss and heat generation of various electrical equipment, resulting in equipment loss or damage; increased loss, resulting in uneconomical operation of equipment, increased electricity expenses, and inaccurate measurement of various meters; Reduce the transmission quality of the signal, destroy the normal transmission of the signal, and even damage the communication equipment; it may cause resonance, so that the reactive power compensation cabinet cannot work normally; reduce the service life of the equipment; make the computer, monitoring and control equipment work abnormally, or even crash, causing Huge loss.
How to solve the above problem?
Electricity and communication have their own characteristics and emphasis, so it is necessary for us to re-understand power quality and related monitoring technologies. It is more necessary to analyze and monitor the power quality. Under such a demand background, the company has applied the research and development advantages with long-term technical accumulation to the related instruments and meters of the power quality and developed a complete set of national leading power quality solution meters. This set of meters can comprehensively and accurately analyze various power events.
Detection
By using the BPT-1831 three-phase power quality analyzer for testing to find problems, through periodic inspections, such as various transformers, substations, and various main power supply equipment, both products can achieve the following measurements: voltage/ Current/frequency, harmonic measurement, power measurement, three-phase unbalance, monitoring record, swell, fluctuation, flicker and with digital oscilloscope function. In this way, some basic indicators of power quality can be accurately measured, and through the computer management software of B/S structure, managers can accurately and timely grasp the power quality status of units in various regions on their own computers. The whole system will provide customers with various reports required by managers, provide decision-making basis for leaders, and provide governance solutions for users. The above is intended as a targeted detection, but there are still many cases where long-term monitoring is required by many specific equipment and units to determine the problem, and long-term monitoring is also helpful for rapid response to emergencies. Then, BPT-1861 three-phase power quality comprehensive analyzer will solve the data acquisition problem for you. Moreover, it also has the function of analyzing the measurement data in detail with the power quality data analysis software on the PC. It has the advantage of being fully automatic, and can transmit the monitored data to the server. And SMS alarm, comprehensive database management software can be used as a strong technical support backing to ensure the safety and availability of data, to ensure timely and accurate reports. Provide users with a new set of working methods, saving manpower and material resources.
Governance
According to the power consumption environment and needs of each user, the company will refer to the relevant standards in the user industry and according to the results of testing and monitoring, experts and professional technicians will formulate unique solutions for users to solve complex power quality problems, to This is the perfect solution. Because each enterprise's plan is not the same, according to the actual power quality of each enterprise, through detection and analysis, we can grasp the problem of enterprise power, formulate a comprehensive management plan for users, use different products, and optimize the best combination. , to achieve the desired effect. Before doing each project, Linpu's technicians will conduct a comprehensive technical exchange with the user's technicians to understand the user's technological characteristics, the specific information of the user's power distribution environment, the biggest problems encountered by the user in the production process and The practical problem that the enterprise most wants to solve After the technical exchange and the collection of basic data, Limp's professional and technical personnel will conduct a comprehensive assessment of the user's problem based on the information they have, and determine the final governance method. Because we have professional technical experts and professional management equipment, through low-voltage reactive power compensation controller, intelligent reactive power compensation controller, split-phase reactive power compensation controller and outdoor compensation box and other management equipment, targeted configuration for users governance plan.
