Relevant technology and protective measures for lightning protection of integrated electromagnetic flow meter

Abstract: The information about the lightning protection technology and protection measures of the integrated electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. When electromagnetic flowmeters are used outdoors, lightning protection is sometimes required. Now Shanghai Meihe has sorted out the lightning protection technology and protective measures for electromagnetic flowmeters: In industrial production, the electrical equipment in use voltage transients. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the lightning protection technology and protection measures of the integrated electromagnetic flowmeter. When electromagnetic flowmeters are used outdoors, lightning protection is sometimes required. Now Shanghai Meihe has sorted out the lightning protection technology and protective measures of electromagnetic flowmeters for everyone: In industrial production, the electrical equipment in use Voltage transients and surges are everywhere. Power grids, lightning strikes, blasting, and even people walking on carpets will generate tens of thousands of volts of electrostatic induction voltage. These are the invisible killers of the integrated electromagnetic flowmeter. Instrumentation often encounters unexpected voltage transients and surges during use, resulting in damage to electronic equipment. The reason for the damage is that the semiconductor devices (including diodes, transistors, thyristors and integrated circuits, etc.) burn out or breakdown. According to statistics, 75% of instrumentation failures are caused by transients and surges. Therefore, in order to improve the reliability of the instrumentation and the safety of the human body, protective measures must be taken against voltage transients and surges. Let's take a look at the relevant content along with the test measurement. Electrostatic discharge (ESD) and electrical fast transients (EFT) will cause different degrees of harm to instrumentation systems. Electrostatic discharge produces strong radio frequency radiation in the frequency range of 5 to 200 MHz. The peak value of this radiation energy often occurs between 35MHz and 45MHz, and self-oscillation occurs. The resonant frequency of many information transmission cables is also usually in this frequency range. As a result, a large amount of electrostatic discharge radiation energy is stringed into the cable. Electrical fast transient bursts also produce fairly strong radiated emissions, which couple into cables and enclosure wiring. When the cable is exposed to 4~8kV electrostatic discharge environment, the induced voltage that can be measured on the terminal load of the information transmission cable can reach 600V, which is far beyond the threshold voltage value of 0.4V for typical digital instruments. Typical induction pulses The duration is about 400 nanoseconds. 1. The lightning protection port of the instrumentation According to the engineering practice of the application of the integrated electromagnetic flowmeter of the instrumentation, the lightning strike of the instrumentation can be roughly divided into direct lightning, induction lightning and conduction lightning. But no matter what form it takes to reach the equipment, it can be summarized as the lightning surge that invades from the following four parts. These parts are called lightning protection ports here, and the instruments and meters are used as examples to illustrate. 1. Shell port For example, we can regard any large or small instrument or system as a whole shell, such as sensors, transmission lines, signal relays, field instruments, DCS systems, etc., they may be completely exposed Direct lightning strikes in the environment, causing equipment damage. The standard stipulates that when the equipment shell is subjected to 4kv lightning electrostatic discharge, it will affect the normal operation of the instrumentation or system. For example, the sensor terminal box placed outdoors may be subject to lightning contact discharge; the DCS cabinet located in the equipment room may be subject to air discharge when the building column leaks. 2. Signal line ports (including antenna feeders, data lines, control lines, etc.) in the control system, in order to realize the transmission of signals or information of the integrated electromagnetic flowmeter, there must be parts connected to the outside world, such as the signal of the process control system. The main distribution frame at the junction, the terminal of the data transmission network, the feeder port from the microwave equipment to the antenna, etc., then these interfaces that receive signals from the outside world or transmit signals may be impacted by lightning surges. 10/700 is used because surges coming from off-building signal ports tend to travel through long cables.μs waveform, the standard stipulates that the line-to-line surge voltage is 0.5kV, and the line-to-ground surge voltage is 1kV. The surge impact on the port that transmits the signal between the instruments in the building is equivalent to the surge impact on the power line, using 1.2/50 (8/20)μs Combined wave, the line-to-line and line-to-ground surge voltage limits remain unchanged. Once the limit is exceeded, the signal port and the equipment behind the port may suffer damage. 3. Power port The power port is the most widely distributed and most likely to induce or conduct lightning waves. These power ports can be located anywhere from the power distribution box to the power socket. The standard is specified at 1.2/50 (8/20)μThe limit of the surge voltage between the s waveform and the line is 0.5kV, and the limit of the surge voltage from the line to the ground is 1kv. However, the surge voltage here indicates that the working voltage is 220V AC. If the working voltage is low, it cannot be used as a standard. Small surges on the power line may not immediately damage the equipment, but at least the lifespan will be affected. 4. Grounding port Although there is no specific reference to the grounding port in the standard, the grounding port of information technology equipment is actually very important. When lightning occurs, the grounding port may be affected by the ground potential counterattack, the ground potential rise, or the equipment may be damaged due to poor grounding or improper grounding, so that the ground resistance is too large and cannot meet the reference potential requirements.
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