Talking about lightning protection measures of intelligent instrument control system

Abstract: The information on lightning protection measures of intelligent instrument control system is provided by excellent flowmeter and flowmeter manufacturers. With the rapid development of the industrial industry, the industrial process is more closely related and controlled, and the corresponding process information and detection management have put forward higher requirements. Intelligent instrument control technology is the development of automatic instrument control in industrial production applications. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on lightning protection measures for intelligent instrument control systems. With the rapid development of the industrial industry, the interconnection and control of industrial processes are more closely, and the corresponding process information and detection management have put forward higher requirements. Intelligent instrument control technology is the development of automatic instrument control in industrial production applications, marking the production Process control has entered a new stage. Since most of the industrial computers, various communication modules, security devices and field measuring instruments in the intelligent instrument control system use the integrated circuit combination of electronic devices, these microelectronic devices generally have fatal weaknesses such as low dielectric strength and low surge resistance. In the thunderstorm season, it is often damaged by lightning strikes, which can cause some damage to the input and output modules of several instrument computers, and cause the entire control system of the device to be paralyzed. Therefore, it is very necessary to add lightning protection devices to these control and production devices. Ways of Lightning Intrusion Due to the widespread application of computer technology in industrial management, the intrusion of lightning surges leads to more and more computer and communication failures. When the power surge exceeds the capacity of the computer, data will be garbled, the chip will be damaged, and even the software system will be damaged, resulting in interruption of receiving/transmitting data. To completely protect the safe operation of the equipment, multi-level protection measures should be taken to make the lightning protection effect safer and more reliable. The study of lightning protection of intelligent instrumentation and control system should start from two aspects: lightning protection of external system and lightning protection of internal system. External lightning protection measures mainly solve the harm of inductive lightning strikes to measuring instruments. The main way of surge intrusion is that the signal cable introduces the induced surge into the side meter circuit to damage the insulation, break down the micro-electrical components, cause the meter failure and direct induction lightning to enter the meter circuit through the meter body, and break down the circuit module to cause failure. The solution is to review the overall lightning protection measures of the device and the grounding of signal communication cables, reasonable wiring and the grounding of metal instrument boxes according to the requirements of lightning protection regulations. The protection system for key interlocking signals should be equipped with a surge device; the internal lightning protection system mainly refers to the lightning protection of the power supply of the intelligent instrument control system, the grounding of the data processing equipment such as the control display unit, the operating system, and the engineer station, as well as the access to the computer. Lightning protection of signal channels and lightning protection measures of signals and power supplies such as switches and network cards associated with the LAN. The practice of preventing lightning strikes 3.1 Improve the grounding system (l) The grounding of the safety protection ground, control cabinet, operation console, engineer station, power cabinet and other casings should be connected together with flat steel. (2) The signal ground of the instrument and the ground of the input and output signals of the computer are the reference points for the measurement of the instrument. The working power supply of all instruments, such as the 24V negative terminal, is connected to this ground to form an equipotential. (3) The intrinsically safe ground, safety barrier, isolation barrier, safety device and other grounding should also be connected with the reference point of the instrument signal to form an equipotential system, the grounding should be gathered at one point, and the resistance should not be greater than lΩ. 3.2 The power supply of the anti-surge intelligent instrument control system is from the power distribution system into the computer main control room. The power supply system is supplied from the power plant through the transformer and power distribution system to the instrumentation system. In the thunderstorm weather, the power supply is very likely to be struck by lightning due to the long route to the Ringway. Therefore, the power supply at this time is not 380v or 220v, 50Hz alternating current. , but the surge voltage is mixed with various clutter. If the anti-surge protection system is not set up, the electrical equipment in use will have an accident due to exceeding the withstand voltage limit. Connect the A, B, C, D three lines and four phases from the general power distribution to the A, B, C, and D terminals opposite to the power surge device. In the thunderstorm, the induced lightning surge is protected by the surge protector, and the overload current is brought into the ground, and the output voltage is clamped in the safe working area to ensure the safe operation of the power supply. The power surge protection system is shown in Figure 1. 3.3 Signal channel surge device The signal channel surge device should ensure accurate, stable and flexible transmission of various detection information of the instrument under normal conditions, and can discharge overvoltage surges to the ground during thunderstorms, and clamp the output voltage in a safe area, thereby Ensure the safety of signal transmission. From the effect of use, the installation of surge arresters for lightning protection greatly improves the safety factor of intelligent instrumentation devices under thunderstorms. The signal lightning protection system is shown in Figure 2. The following factors should be paid attention to when applying lightning protection products: (l) Regularly check and maintain the faults such as grounding, bus bar, grounding body rust and breakage of the power supply system of the intelligent instrument control system, repair them in time to make them return to normal, and regularly check the resistance (resistance in 1 only). If it is found that the resistance value increases, the cause should be identified and the resistance should be reduced.

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