Device and method for detecting conduction performance of equipotential connecting wire

Abstract

The invention relates to a device and method for detecting the conduction performance of an equipotential connecting wire, and the device comprises a power supply, a first resistor, a variable resistor, an ammeter, an adjusting switch, and a voltmeter, the power supply, the first resistor, the ammeter, the voltmeter, and a to-be-measured equipotential connecting wire form a series loop. One end of the adjusting switch is connected with one end of the variable resistor, the other end of the variable resistor is connected with one end of the voltmeter, and the other end of the adjusting switch is connected with the other end of the voltmeter. The detection device can be used for rapidly and accurately detecting the conduction performance of the equipotential connecting wire, especially the conduction performance of the PE wire and the PEN wire, so that personal injury and property loss accidents occurring in the later use process can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of conducting performance detection of equipotential bonding wires, and in particular relates to a device and method for detecting the conducting performance of equipotential bonding wires. Background Art

[0002] Before a building's electrical installations are completed and put into use, they must be inspected and qualified before they can be put into use. For example, data such as loop impedance and grounding resistance must be verified through on-site measurements with actual data. Secondly, defects may also be left behind due to negligence during construction and installation, such as the neutral line in an electrical installation being grounded. Therefore, these defects must also be discovered and corrected through testing to prevent electrical hazards caused by errors in construction.

[0003] Usually, inspection work can be carried out during the installation of electrical equipment or after the installation is completed. Inspection work is usually divided into two parts: visual inspection and testing. Visual inspection refers to the inspection of the appearance of electrical equipment and circuits by inspectors. This inspection is relatively easy to do and intuitive; while testing requires the measurement of some electrical data of the electrical equipment. The test data can be used to determine the effectiveness of the electrical equipment in terms of safety and function.

[0004] Potential connection is to make reliable electrical connection between the metal frame, metal device, non-charged metal casing of electrical equipment and protective conductor of electrical system in the building and the grounding device, and the protective wire used for equipotential connection is called equipotential bonding wire. Figure 1 As shown, the conductivity performance of the equipotential bonding wire needs to be determined by obtaining corresponding resistance data through testing. Therefore, an efficient and accurate detection system is crucial to the safety and functional effectiveness of electrical equipment. Summary of the invention

[0005] In order to solve all or part of the above problems, the present invention aims to provide a detection device and method for the conductive performance of an equipotential bonding wire. The detection device of the present invention can quickly and accurately detect the conductive performance of the equipotential bonding wire.

[0006] According to one aspect of the present invention, there is provided a device for detecting the conductivity performance of an equipotential bonding wire, comprising a power supply, a first resistor, a variable resistor, an ammeter, an adjusting switch and a voltmeter, wherein the power supply, the first resistor, the ammeter and the voltmeter form a series circuit with the equipotential bonding wire to be measured, one end of the adjusting switch is connected to one end of the variable resistor, the other end of the variable resistor is connected to one end of the voltmeter, and the other end of the adjusting switch is connected to the other end of the voltmeter.

[0007] The present invention also provides a method for detecting the conductivity of an equipotential bonding wire, using the detection device according to claim 1, the detection method comprising:

[0008] Adjust the regulating switch to an off state, and read the first value of the voltmeter at this time;

[0009] Adjust the adjustment switch to a closed state, adjust the variable resistor, and read the second value of the voltmeter and the first current value of the ammeter at this time;

[0010] Calculate the resistance value of the equipotential bonding wire according to the first value, the second value and the first current value; and

[0011] The conduction performance of the potential connection line is judged according to the resistance value of the equipotential connection line.

[0012] Furthermore, the step of adjusting the variable resistor is as follows:

[0013] The variable resistor is adjusted so that the reading of the ammeter is displayed as a value greater than 0.2A.

[0014] Furthermore, the calculation of the resistance value of the equipotential bonding wire according to the first value, the second value and the first current value further includes:

[0015] Obtaining an equation regarding the resistance value of the equipotential bonding wire according to the first value, the second value, and the first current value; and

[0016] The resistance value of the equipotential bonding wire is calculated according to the equation.

[0017] Furthermore, the equation for obtaining the resistance value of the equipotential bonding wire based on the first value, the second value and the first current value is specifically: the first value is equal to the sum of the following two items, where the first item is the second value, and the second item is the sum of the resistance value of the equipotential bonding wire and the resistance value of the first resistor multiplied by the first current value.

[0018] Furthermore, before adjusting the regulating switch to the off state and reading the first value of the voltmeter at this time, the method further includes:

[0019] The resistance value of the first resistor is obtained by measurement.

[0020] Furthermore, judging the conduction performance of the potential connection line according to the resistance value of the equipotential connection line is specifically as follows:

[0021] If the resistance value of the equipotential bonding wire is less than or equal to the allowable value of its corresponding device, the conductivity of the equipotential bonding wire is qualified; otherwise, the conductivity of the equipotential bonding wire is unqualified.

[0022] It can be seen from the above technical solution that the detection device and method for the conductive performance of an equipotential bonding wire provided by the present invention have the following beneficial effects:

[0023] The detection device of the present invention can quickly and accurately detect the conductivity of equipotential bonding wires, especially the conductivity of PE wires and PEN wires, thereby reducing personal injury and property loss accidents that may occur during later use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the equipotential bonding system;

[0025] Figure 2 Schematic diagram of a device for detecting the conductivity of an equipotential bonding wire according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a detection device and a detection method for the conductive performance of an equipotential bonding wire of the present invention in conjunction with the accompanying drawings.

[0027] The volt-ampere characteristic curve of a pure resistance element is a straight line, that is, the current passing through the pure resistance element is proportional to the voltage applied to its two ends. Therefore, a pure resistance circuit consisting of a voltage source, a pure resistance element with known resistance, a part to be detected, and a measuring instrument can be constructed. By adjusting the resistance value of the pure resistance element, two different sets of voltage and current data can be obtained to obtain the resistance value of the part to be detected. By comparing with the required data, it can be known whether the conductivity performance of the electrical device and the equipotential bonding line meets the requirements.

[0028] like Figure 2 As shown, it shows a device for detecting the conductivity performance of an equipotential bonding wire according to an embodiment of the present invention, comprising a power supply 1, a first resistor 2, a variable resistor 3, an ammeter 4, an adjusting switch 5 and a voltmeter 6, wherein the power supply 1, the first resistor 2, the ammeter 4 and the voltmeter 6 form a series circuit with the equipotential bonding wire 7 to be measured, one end of the adjusting switch 5 is connected to one end of the variable resistor 3, the other end of the variable resistor 3 is connected to one end of the voltmeter 6, and the other end of the adjusting switch 5 is connected to the other end of the voltmeter 6.

[0029] The detection device of the embodiment of the present invention can quickly and accurately detect the conductivity of the equipotential bonding wires, especially the conductivity of the PE wire and the PEN wire.

[0030] Based on the detection device of the embodiment of the present invention, the embodiment of the present invention also provides a method for detecting the conductivity performance of an equipotential bonding wire, comprising the following steps:

[0031] S001: Adjust the regulating switch to the off state and read the first value U1 of the voltmeter at this time;

[0032] S002: Adjust the adjustment switch to a closed state, adjust the variable resistor, and read the second value U2 of the voltmeter and the first current value I of the ammeter at this time;

[0033] S003: Calculate the resistance value Rp of the equipotential bonding wire according to the first value U1, the second value U2 and the first current value I; and

[0034] S004: Determine the conduction performance of the potential connection line according to the resistance value Rp of the equipotential connection line.

[0035] The adjusting of the variable resistor in S002 specifically includes: adjusting the variable resistor so that the reading of the ammeter displays a value greater than 0.2A.

[0036] S003 calculates the resistance value of the equipotential bonding wire according to the first value, the second value and the first current value, further comprising:

[0037] S0031: Obtain an equation regarding the resistance value of the equipotential bonding wire according to the first value, the second value, and the first current value.

[0038] Specifically, the first value U1 is equal to the sum of the following two items, where the first item is the second value U2, and the second item is the sum of the resistance value Rp of the equipotential bonding wire and the resistance value Rw of the first resistor multiplied by the first current value I, that is: U1=U2+I(Rw+Rp).

[0039] S0032: Calculate the resistance value of the equipotential bonding wire according to the equation.

[0040] Specifically, according to the above formula, we can get: Rp = (U1-U2) / I-Rw. Through this formula, the resistance value Rp of the equipotential bonding wire can be obtained according to the specific values ​​of the first value U1, the second value U2, the first current value I and the resistance value Rw of the first resistor.

[0041] Wherein, before adjusting the adjustment switch to the disconnected state and reading the first value of the voltmeter at S001, the detection method further includes: obtaining the resistance value Rw of the first resistor by measurement.

[0042] Among them, S004 determines the conduction performance of the potential connection line according to the resistance value Rp of the equipotential connection line:

[0043] If the resistance value of the equipotential bonding wire is less than or equal to the allowable value of its corresponding device, the conductivity performance of the equipotential bonding wire is qualified; otherwise, the conductivity performance of the equipotential bonding wire is unqualified.

[0044] Generally speaking, for the equipotential bonding of power frequency devices, Rp≤3Ω can be considered qualified, but in some special places there are higher requirements for the Rp value. For example, in some operating rooms in hospitals, the Rp value is required to be no greater than 0.2Ω.

[0045] The detection method of the embodiment of the present invention can quickly and accurately detect the conductivity of equipotential bonding wires, especially the conductivity of PE wires and PEN wires, thereby reducing personal injury and property loss accidents that may occur during later use.

[0046] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0047] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A device for detecting the conductivity of an equipotential bonding wire, characterized in that: It includes a power supply, a first resistor, a variable resistor, an ammeter, an adjustment switch and a voltmeter, wherein the power supply, the first resistor, the ammeter and the voltmeter form a series circuit with the equipotential bonding wire to be measured, one end of the adjustment switch is connected to one end of the variable resistor, the other end of the variable resistor is connected to one end of the voltmeter, and the other end of the adjustment switch is connected to the other end of the voltmeter.

2. A method for detecting the conductivity of an equipotential bonding wire, characterized in that: Using the detection device according to claim 1, the detection method comprises: Adjust the regulating switch to an off state, and read the first value of the voltmeter at this time; Adjust the adjustment switch to a closed state, adjust the variable resistor, and read the second value of the voltmeter and the first current value of the ammeter at this time; Calculate the resistance value of the equipotential bonding wire according to the first value, the second value and the first current value; and The conduction performance of the potential connection line is judged according to the resistance value of the equipotential connection line.

3. The detection method according to claim 2, characterized in that: The step of adjusting the variable resistor is as follows: The variable resistor is adjusted so that the reading of the ammeter is displayed as a value greater than 0.2A.

4. The detection method according to claim 2, characterized in that: The step of calculating the resistance value of the equipotential bonding wire according to the first value, the second value and the first current value further comprises: Obtaining an equation regarding the resistance value of the equipotential bonding wire according to the first value, the second value, and the first current value; and The resistance value of the equipotential bonding wire is calculated according to the equation.

5. The detection method according to claim 4, characterized in that: The equation for obtaining the resistance value of the equipotential bonding wire based on the first value, the second value and the first current value is specifically: the first value is equal to the sum of the following two items, where the first item is the second value, and the second item is the sum of the resistance value of the equipotential bonding wire and the resistance value of the first resistor multiplied by the first current value.

6. The detection method according to claim 2, characterized in that: Before adjusting the regulating switch to the off state and reading the first value of the voltmeter at this time, the method further includes: The resistance value of the first resistor is obtained by measurement.

7. The detection method according to claim 2, characterized in that: The method of judging the conduction performance of the potential connection line according to the resistance value of the equipotential connection line is specifically as follows: If the resistance value of the equipotential bonding wire is less than or equal to the allowable value of its corresponding device, the conductivity of the equipotential bonding wire is qualified; otherwise, the conductivity of the equipotential bonding wire is unqualified.

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