A monitoring device for a ground grid ground wire

Abstract

The application provides a monitoring device for ground net grounding wire, comprising a resistance box and a monitor body; a base is arranged in the resistance box, at least two first detection parts and second detection parts in series are arranged on the base; at least a second wiring part is arranged between the first detection part and the second detection part, at least a first wiring part is arranged at the other end of the first detection part, and at least a third wiring part is arranged at the other end of the second detection part; at least a circuit board main plate is arranged in the monitor body; the circuit board main plate detects the resistance change between the first wiring part and the second wiring part connected thereto, and judges the condition of the ground net grounding wire according to the resistance change. The application realizes the function of stable monitoring of the grounding wire, can monitor the weak resistance value change, has the high-speed collection function, and can capture the signal change in a very short time.

Description

Technical Field

[0001] This invention relates to the field of monitoring technology for grounding wires in grounding grids, and in particular to a monitoring device for grounding wires in grounding grids. Background Technology

[0002] Equipment grounding is a crucial safety measure, especially in substations. When hoisting operations are required in a substation, the crane must be grounded. The reliability of the grounding connection directly affects the safety of the personnel working on the job.

[0003] To ensure reliable grounding connections, regular inspections by designated personnel are required. However, there are many limitations; it can only be used in independent grounding situations and cannot be used in other grounding types, such as grounding grids. Summary of the Invention

[0004] The purpose of this invention is to provide a monitoring device for grounding wires of a grounding grid, which solves the technical problem of how to be compatible with various grounding types and detect the grounding status.

[0005] On the one hand, a monitoring device for grounding wires of a grounding grid is provided, comprising:

[0006] Interconnected resistor boxes and monitor bodies;

[0007] The resistor box is provided with a base, and at least two first detection parts and second detection parts connected in series are provided on the base; at least a second wiring part is provided between the first detection part and the second detection part, at least a first wiring part is provided at the other end of the first detection part, and at least a third wiring part is provided at the other end of the second detection part.

[0008] The first wiring portion and the third wiring portion are respectively connected to the grounding network being tested and the device connected to the grounding network; the first wiring portion and the second wiring portion are respectively connected to the monitor body, and the monitor body is used to measure the resistance value of the first detection portion when the metal connector being inspected is connected;

[0009] The monitor body is provided with at least a main circuit board. The main circuit board detects the resistance change between the first wiring part and the second wiring part connected to it, and determines the status of the grounding wire of the grounding grid based on the resistance change.

[0010] Preferably, the monitor body includes:

[0011] The monitor housing is wrapped around the main board of the circuit board, and the surface of the monitor housing is provided with a first test connector, a second test connector, a display unit and a control unit that are electrically connected to the main board of the circuit board;

[0012] The first test connector is used to connect the circuit board motherboard to the first wiring section;

[0013] The second test connector is used to connect the main board of the circuit board to the third wiring section.

[0014] Preferably, it further includes:

[0015] The device under test is connected to the grounding grid under test via a grounding wire, and the test wire connects the first test connector and the second test connector to the first wiring portion and the second wiring portion, respectively.

[0016] Preferably, a first resistor is provided in the first detection unit, the resistance value of the first resistor is preset to 1KΩ, and the power of the first resistor is set to 200W.

[0017] Preferably, a second resistor is provided in the second detection unit, the resistance value of the second resistor is preset to 1KΩ, and the power of the second resistor is set to 200W.

[0018] Preferably, the main board of the circuit board determines the grounding wire configuration based on the resistance value between the first and second wiring terminals.

[0019] When the resistance between the first terminal and the second terminal is equal to 1KΩ, the grounding wire is determined to be disconnected.

[0020] When the resistance between the first terminal and the second terminal is between 0.5KΩ and 1KΩ, the measured resistance value is recorded in real time and stored for a preset duration.

[0021] When the resistance value between the first terminal and the second terminal changes abruptly or jumps, it is determined that the grounding wire is loose.

[0022] Preferably, the main board of the circuit board is also used to determine whether the measured resistance value recorded in real time meets the preset conditions for a good grounding connection.

[0023] If the conditions are met, the grounding wire connection is considered good; if the conditions are not met, the grounding wire connection is considered abnormal.

[0024] Preferably, the preset conditions for a good grounding wire connection specifically include:

[0025]

[0026] Among them, R L The measurement results are for the metal connectors under inspection when they are in good connection condition. R1 is the preset resistance value of the first resistor, and R2 is the preset resistance value of the second resistor.

[0027] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0028] The grounding wire monitoring device provided by this invention uses the principle of resistance voltage division and small signal processing technology, and consists of two devices: a resistance box and a monitor. It achieves the function of stable grounding wire monitoring; the detector itself can amplify and extract small signals, thus enabling the monitoring of weak resistance value changes, and it also features high-speed acquisition capabilities, capable of capturing signal changes over extremely short periods. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0030] Figure 1 This is a schematic diagram of a grounding wire monitoring device according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the resistor box in an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the monitor body in an embodiment of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1 The diagram shown is a schematic representation of an embodiment of a grounding wire monitoring device provided by the present invention. This embodiment includes:

[0035] The resistor box 101 and the monitor body 102 are connected to each other; such as Figure 2As shown, a base 1 is provided inside the resistor box 101. At least two first detection units 2 and second detection units 3 connected in series are provided on the base 1. At least a second wiring portion 4 is provided between the first detection unit 2 and the second detection unit 3. At least a first wiring portion 5 is provided at the other end of the first detection unit 2, and at least a third wiring portion 6 is provided at the other end of the second detection unit 3. The first wiring portion 5 and the third wiring portion 6 are respectively connected to the grounding grid 105 being tested and the device connected to the grounding grid 105. The first wiring portion 5 and the second wiring portion 4 are respectively connected to the monitor body 102, which is used to measure the resistance value of the first detection unit 2 when connected to the metal connector being inspected. The monitor body 102 is provided with at least a circuit board main board, which detects the resistance change between the first wiring portion 5 and the second wiring portion 4 connected to it, and determines the condition of the grounding wire 103 of the grounding grid 105 based on the resistance change. Understandably, the connection circuit of this device is simple; it only requires connecting the terminals of the first wiring portion 5 and the third wiring portion 6 of the resistor box to the crane and the grounding point, respectively. The monitor body 102 is connected to the terminals of the first terminal 5 and the second terminal 4 of the resistor box, completing all the wiring work. Since the resistor box is connected in series in the grounding loop, this device is not part of the grounding loop. Therefore, no large discharge current flows into this device. Furthermore, the resistor box is connected in series with resistors R1 and R2, whose resistance is much higher than that of the grounding wire 103. The discharge path generally passes through the low-resistance grounding wire 103 to the grounding grid 105. Only a small portion passes through the resistor box to the grounding grid 105, thus minimizing the risk of damage. Its practicality and reliability are both very high.

[0036] In a specific embodiment, a first resistor is provided in the first detection unit 2, with a preset resistance value of 1KΩ and a power rating of 200W. A second resistor is provided in the second detection unit 3, with a preset resistance value of 1KΩ and a power rating of 200W. It is understood that two 1KΩ resistors connected in series are used in parallel with the cable under test to detect the connection quality of the cable. Since the target being tested is a conductor, its resistance is usually very small. After being connected in parallel with these two resistors, the voltage drop across the first detection unit 2 and the second detection unit 3 is very small. Moreover, all resistors in this device are high-power resistors. Therefore, the device can withstand a certain current surge, ensuring that the device can be monitored and tested for a long time. The base 1 is used to fix and install the resistors and wiring components. Wiring component fixing positions are located on its left, right, and upper center.

[0037] Specifically, the first wiring part 5 is installed on the leftmost side of the base 1 of the resistor box 101, and is connected to one end of the first detection part 2 (high-power resistor). The second wiring part 4 is installed on the rightmost side of the base 1 of the resistor box 101, and is connected to one end of the second detection part 3 (high-power resistor). The other ends of the first detection part 2 and the second detection part 3 are connected together and connected to the third wiring part 6; both the first detection part 2 and the second detection part 3 are set as high-power resistors, both with a resistance of 1KΩ and a power of 200W.

[0038] In specific embodiments, such as Figure 3 As shown, the monitor body 102 includes: a monitor housing 9, which encloses the main board of the circuit board. The surface of the monitor housing 9 is provided with a first test connector 7, a second test connector 8, a display unit 11, and a control unit 10, all electrically connected to the main board of the circuit board. The first test connector 7 connects the main board of the circuit board to the first wiring portion 5; the second test connector 8 connects the main board of the circuit board to the third wiring portion 6. Understandably, the main board of the circuit board, a battery, etc., are installed inside the monitor housing 9. A display screen is provided at the top of the monitor housing 9. Test connectors are installed at the bottom to connect test cables 104, the other ends of which are connected to the wiring terminals of the resistor box 101 base 1. A joystick and control buttons are installed on the panel.

[0039] Specifically, the main board of the circuit board determines the status of the grounding wire 103 of the grounding grid 105 based on the resistance value between the first terminal 5 and the second terminal 4. When the resistance value between the first terminal 5 and the second terminal 4 is equal to 1KΩ, the grounding wire 103 is determined to be disconnected; when the resistance value between the first terminal 5 and the second terminal 4 is between 0.5KΩ and 1KΩ, the measured resistance value is recorded in real time and stored for a preset duration; when the resistance value between the first terminal 5 and the second terminal 4 experiences a sudden change or jump, the grounding wire 103 is determined to be loose. The main board of the circuit board is also used to determine whether the measured resistance value recorded in real time meets the preset conditions for a good connection of the grounding wire 103. When it meets the conditions, the grounding wire 103 is determined to be well connected; when it does not meet the conditions, the grounding wire 103 is determined to be abnormally connected. It is understood that two resistors R1 and R2 with fixed resistance values ​​are known, and their resistance values ​​are equal. The monitoring loop is connected as shown in the figure. When grounding wire 103 is properly connected: Grounding wire 103, together with resistors R1 and R2 in the grounding box, forms a parallel network. The resistance detected by the tester in this case is essentially the parallel resistance of R1 and R2 in the grounding box, and it is always less than either R1 or R2. When grounding wire 103 is disconnected: The detected resistance is essentially the resistance of R1 in the grounding box. When grounding wire 103 has poor contact: The detected resistance is between the disconnection resistance and the good connection resistance. The measured resistance value is recorded in real time and stored for a certain period of time. Based on the real-time detection value and historical records, a proprietary algorithm can evaluate and predict the connection status of grounding wire 103.

[0040] The specific conditions for a good connection of the preset grounding wire 103 include:

[0041]

[0042] Among them, R L The measurement results are for the metal connectors under inspection when they are in good connection condition. R1 is the preset resistance value of the first resistor, and R2 is the preset resistance value of the second resistor.

[0043] This embodiment also includes: a grounding wire 103 and a test wire 104. The grounding wire 103 is used to connect the device under test to the grounding grid 105 under test. The test wire 104 connects the first test connector 7 and the second test connector 8 to the first wiring portion 5 and the second wiring portion 4, respectively. The grounding wire 103 is used to ground the crane and connect the crane to the grounding grid 105. The test wire 104 is used to connect the resistor box 101 and the monitor body 102.

[0044] In a specific embodiment, after the crane enters the working position, the grounding wire 103 is connected first. One end of the grounding wire 103 is connected to the crane's grounding point, and the other end is connected to the grounding grid 105. The resistor box 101 is connected to the test circuit using test leads 104. The crane's grounding point is connected to the first terminal of the resistor box 101 via the test lead 104. The grounding grid 105 is also connected to the second terminal of the resistor box 101 via the test lead 104.

[0045] The first test connector 7 and the second test connector 8 of the monitor body 102 are connected to the first terminal and the second terminal of the resistor box 101 via test wires 104.

[0046] When the monitoring device is activated, and all connections are secure and reliable, the values ​​measured by the diagnostic monitor should be relatively stable, without sudden changes or jumps. When the grounding wire 103 becomes loose due to crane rotation or vehicle vibration, the values ​​monitored by the monitor body 102 will change abruptly. The monitor body 102 can detect and record these slight jumps. When the frequency and amplitude of these jumps reach a set threshold, an audible alarm will be immediately triggered, indicating a fault in the grounding wire 103. When the grounding wire 103 is disconnected: the resistance detected by the monitor body 102 is essentially the resistance of R1 in the grounding box. When the grounding wire 103 is properly connected: the grounding wire 103, R1, and R2 in the grounding box form a parallel network. The resistance detected by the monitor body 102 is essentially the parallel resistance of R1 and R2 in the grounding box, which is always less than either R1 or R2.

[0047] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0048] The grounding wire monitoring device provided by this invention uses the principle of resistance voltage division and small signal processing technology, and consists of two devices: a resistance box and a monitor. It achieves the function of stable grounding wire monitoring; the detector itself can amplify and extract small signals, thus enabling the monitoring of weak resistance value changes, and it also features high-speed acquisition capabilities, capable of capturing signal changes over extremely short periods.

[0049] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A monitoring device for grounding wires of a grounding grid, characterized in that, include: The interconnected resistor box and monitor body, grounding wire and test leads; The resistor box is provided with a base, and at least two first detection parts and second detection parts connected in series are provided on the base; at least a second wiring part is provided between the first detection part and the second detection part, at least a first wiring part is provided at the other end of the first detection part, and at least a third wiring part is provided at the other end of the second detection part; a first resistor is provided in the first detection part, and the resistance value of the first resistor is preset to 1KΩ; a second resistor is provided in the second detection part, and the resistance value of the second resistor is preset to 1KΩ. The third terminal is connected to the grounding grid being tested, and the first terminal is connected to the device connected to the grounding grid; the first terminal and the second terminal are respectively connected to the monitor body, and the monitor body is used to measure the resistance value of the first detection unit when the grounding wire is connected; The monitor body is provided with at least a main circuit board. The main circuit board detects the resistance change between the first terminal and the second terminal connected to it, and determines the condition of the grounding wire based on the resistance change. The monitoring device body includes: The monitor housing is wrapped around the main board of the circuit board, and the surface of the monitor housing is provided with a first test connector, a second test connector, a display unit and a control unit that are electrically connected to the main board of the circuit board; The first test connector is used to connect the circuit board motherboard to the first wiring section; The second test connector is used to connect the main board of the circuit board to the second wiring section; The grounding wire is used to connect the device connected to the grounding grid to the grounding grid being tested, and the test wire connects the first test connector to the first wiring part and the second test connector to the second wiring part; The main board of the circuit board determines the grounding wire status based on the resistance value between the first and second terminals. When the resistance value between the first and second terminals is equal to 1KΩ, the grounding wire is determined to be disconnected. When the resistance value between the first and second terminals is between 0.5KΩ and 1KΩ, the measured resistance value is recorded in real time and stored for a preset duration. When the resistance value between the first and second terminals changes abruptly or jumps, the grounding wire is determined to be loose.

2. The monitoring device as described in claim 1, characterized in that, The power of the first resistor is set to 200W.

3. The monitoring device as described in claim 2, characterized in that, The power of the second resistor is set to 200W.

4. The monitoring device as described in claim 1, characterized in that, The main board of the circuit board is also used to determine whether the measured resistance value recorded in real time meets the preset grounding connection conditions. If the conditions are met, the grounding wire connection is considered good; if the conditions are not met, the grounding wire connection is considered abnormal.

5. The monitoring device as described in claim 4, characterized in that, The preset conditions for a good grounding connection specifically include: in, The measurement results are for the grounding wire when it is properly connected. The preset resistance value for the first resistor. The preset resistance value for the second resistor.

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