Ground noise interference isolation device of signal control system

Abstract

The invention discloses a signal control system ground noise interference isolation device which comprises a high-frequency filtering unit, a high-voltage equipotential connector and a ground voltage monitoring device, the high-frequency filtering unit is electrically connected with a protection ground, the high-voltage equipotential connector and a ground screen of a lightning protection ground, the high-voltage equipotential connector is further electrically connected with a working ground, and the ground voltage monitoring device is electrically connected with the high-frequency filtering unit. And the ground voltage monitoring device is electrically connected with the ground grid. Through isolation of ground noise interference of a control system and suppression of lightning stroke or other overvoltage types, equipotential connection of a protection ground, a working ground and a lightning protection ground in a power frequency and direct current system and physical isolation in a high-frequency energy section are achieved, the influence of ground potential return stroke and ground noise on the control system is reduced, and the reliability of the system is improved. The safety and continuity of equipment operation are ensured, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of lightning protection technology, and in particular to a noise interference isolation device for a signal control system. Background Technology

[0002] Control systems are now widely used in all sectors of human society. In industry, control systems exist for various physical quantities encountered in production processes such as metallurgy, chemical engineering, and machinery manufacturing, including temperature, flow rate, pressure, thickness, tension, speed, position, frequency, and phase. Grounding in a control system ensures that when problems arise with signals, power supplies, or the equipment itself, an effective grounding system can withstand overload currents and quickly conduct them to the earth. However, in actual operation, some control systems frequently "crash" (or crash for unknown reasons), mostly due to poor grounding or problems such as ground potential backlash and ground noise interference. Therefore, proper, reliable, and correct grounding is crucial for the safe, reliable, and efficient operation of a control system. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of grounding control systems in various industries being unable to function properly due to ground noise interference, reduce equipment failures and personnel safety accidents caused by ground potential return damage, and at the same time monitor the grounding grid operation status in real time through a ground voltage monitoring device and verify the effectiveness of equipment operation, thus providing a ground noise interference isolation device for signal control systems.

[0004] The technical solution of the present invention is as follows: The present invention provides a ground noise interference isolation device for a signal control system, comprising: a high-frequency filtering unit, a high-voltage equipotential connector, and a ground voltage monitoring device. The high-frequency filtering unit is electrically connected to the protective ground, the high-voltage equipotential connector, and the lightning protection ground, respectively. The high-voltage equipotential connector is also electrically connected to the working ground. The ground voltage monitoring device is electrically connected to the ground grid. The ground voltage monitoring device is used to monitor the operating status of the ground grid in real time and record the time and magnitude of the ground potential rise. The high-frequency filtering unit is in a conducting state in the power frequency or DC system and is used to filter and suppress most of the energy after the ground grid potential rises. The high-voltage equipotential connector is used to ensure electrical isolation under breakdown voltage and completely cut off the interference of residual ground potential energy and ground noise to the working ground.

[0005] Furthermore, the high-frequency filtering unit meets the filtering and suppression function of lightning in the kHz spectrum range, and the effective suppression rate is 95%-97%.

[0006] Furthermore, the ground voltage monitoring device is connected to an external communication network via an RS485 interface.

[0007] By adopting the above solution, the beneficial effects of the present invention are as follows: by isolating ground noise interference in the control system and suppressing lightning strikes or other types of overvoltages, the protective ground, working ground and lightning protection ground are equipotentially connected in the power frequency and DC system, and physical isolation is achieved in the high-frequency energy range, the impact of ground potential return stroke and ground noise on the control system is reduced, ensuring the safety and continuity of equipment operation and improving production efficiency. Attached Figure Description

[0008] Figure 1 This is a structural block diagram of an embodiment of the present invention. Detailed Implementation

[0009] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0010] Please see Figure 1 In this embodiment, the present invention provides a signal control system ground noise interference isolation device, comprising: a high-frequency filtering unit, a high-voltage equipotential connector, and a ground voltage monitoring device. The high-frequency filtering unit is electrically connected to the protective ground, the high-voltage equipotential connector, and the lightning protection ground, respectively. The high-voltage equipotential connector is also electrically connected to the working ground, and the ground voltage monitoring device is electrically connected to the ground grid.

[0011] The ground voltage monitoring device is used to monitor the grounding grid's operating status in real time. When encountering a rise in grounding grid potential caused by lightning strikes or other overvoltages, it records the time and magnitude of the transient overvoltage and transmits this data externally via an RS485 interface, providing data support for scientific analysis of subsequent equipment failures or lightning strike accidents. The high-frequency filtering unit is in a conducting state in both power frequency and DC systems, and simultaneously meets the filtering and suppression function of lightning in the kHz spectrum range. After the grounding grid potential rises, 95%-97% of the energy reaching the device is filtered and suppressed, with only 3%-5% of the energy returning to the protective ground, greatly reducing the damage to the equipment caused by ground potential return strikes. The high-voltage equipotential bonding connector adopts a closed-gap structure design to ensure electrical isolation under a breakdown voltage of 1000-1500V. The working ground is connected to the high-frequency filtering device through the high-voltage equipotential bonding connector. While the high-frequency filtering device suppresses ground potential energy, the remaining 3%-5% of energy and high-frequency interference such as ground noise cannot enter the working ground through the high-voltage equipotential bonding connector, minimizing interference from high-frequency signals such as lightning strikes and ground noise on the working ground and ensuring normal equipment operation.

[0012] In summary, this solution isolates ground noise interference in the control system, suppresses lightning strikes or other overvoltage types, achieves equipotential bonding of protective ground, working ground, and lightning protection ground in power frequency and DC systems, and provides physical isolation in the high-frequency energy range. This reduces the impact of ground potential return strokes and ground noise on the control system, ensures the safety and continuity of equipment operation, and improves production efficiency.

[0013] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A signal control system ground noise interference isolation device, comprising: The application relates to a high-frequency filter unit, a high-voltage equipotential connector and a ground voltage monitoring device, wherein the high-frequency filter unit is electrically connected with a protective ground, a high-voltage equipotential connector and a lightning protection ground respectively; the high-voltage equipotential connector is also electrically connected with a working ground; the ground voltage monitoring device is electrically connected with a ground net; the ground voltage monitoring device is used for monitoring the running state of the ground net in real time, recording the time and size of the ground potential rise; the high-frequency filter unit is in a conducting state in a power frequency or direct current system, and is used for filtering and inhibiting most of the energy after the ground potential rises; the high-voltage equipotential connector is used for ensuring electrical isolation under the breakdown voltage, and completely cutting off the interference of the residual energy of the ground potential and ground noise on the working ground. The high-frequency filter unit meets the filtering and inhibiting function of the lightning kHz frequency spectrum range, and the effective inhibiting rate is 95%-97%.

2. The signal control system noise interference isolation apparatus of claim 1, wherein, The high-voltage equipotential connector adopts a closed gap structure.

3. The signal control system noise interference isolation apparatus of claim 2, wherein, The ground voltage monitoring device is connected with an external communication through an RS485 interface.

4. The signal control system noise interference isolation apparatus according to any one of claims 1 to 3, characterized by, ​

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