CN118091499A - Secondary cable core checking device and method based on voltage amplitude-frequency detection - Google Patents

Abstract

The invention belongs to the technical field of cable core detection, and particularly provides a secondary cable core checking device and method based on voltage amplitude-frequency detection, wherein the device comprises a power supply control end, a power supply branch connected with a wiring jack of a first aviation plug connecting wire is further arranged at the power supply control end, the power supply branch is sequentially controlled to be connected with an anode or a cathode of the frequency conversion alternating current power supply module, a detection branch connected with the wiring jack of a second aviation plug connecting wire is arranged at a detection processing end, and each detection branch is provided with an amplitude-frequency detection module for collecting voltage amplitude and frequency; the detection processing end matches the detection branch corresponding to the power supply branch connected with the wire core according to the voltage amplitude and frequency output by the variable-frequency alternating-current power supply module and the voltage amplitude and frequency detected by the amplitude-frequency detection module and outputs the checked wire core. The checking speed is high, the accuracy is high, and the checking method is not easy to be interfered by external environment.

Description

A secondary cable core checking device and method based on voltage amplitude and frequency detection

Technical Field

The present invention relates to the technical field of power cable core detection, and in particular to a secondary cable core checking device and method based on voltage amplitude and frequency detection.

Background technique

The laying of secondary cables is a common task in the construction of new substations or the renovation of various relay protection equipment. The cores of the secondary cables can only be connected to the operating equipment and realize related functions after being checked and the corresponding relationship between the cores at both ends is determined. Once the core access sequence is wrong, the equipment may not be able to realize the corresponding function, or even cause serious accidents such as substation malfunction and tripping, which seriously affects the safe operation of the power grid. Therefore, it is of great value and significance to develop an accurate, convenient and fast multi-core secondary cable core verification device.

The most commonly used method for checking the cores of secondary cables in field work is the manual core checking method. Two workers stand at the two ends of the cable to be checked. One worker grounds each core of the cable at one end, and the worker at the other end uses the multimeter's loop measurement function to measure whether the loop between each core and the ground is connected. When the loop is connected, the two ends correspond to the same core. The defects of this method are very obvious. The workers at both ends need to measure each core alternately in turn. The work needs to be repeated many times, the operation is cumbersome and the efficiency is extremely low. Each work requires at least two workers to complete it smoothly, which takes up a lot of human resources. In addition, the accuracy of the check is also affected by whether the grounding point at the work site is good.

In addition, various new types of dedicated secondary cable core line devices have been applied to various substation construction sites. Although these devices have improved accuracy compared to manual methods, they have various problems such as cumbersome wiring, complex operation, bulky size, and the need for external power supply. They are not convenient to use, so they have not been widely used and popularized.

Summary of the invention

Aiming at the problems of cumbersome wiring and complicated operation in the existing secondary cable core wire devices, the present invention provides a secondary cable core checking device and method based on voltage amplitude and frequency detection.

In a first aspect, the technical solution of the present invention provides a secondary cable core checking device based on voltage amplitude and frequency detection, including a power supply control end and a detection processing end;

The power supply control end is connected to a first aviation plug connection line, the detection processing end is connected to a second aviation plug connection line, and the first aviation plug connection line and the second aviation plug connection line are respectively provided with crocodile clips; the power supply control end is connected to one end of the secondary cable core to be checked through the crocodile clip of the first aviation plug connection line, and the other end of the secondary cable core to be checked is connected to the detection processing end through the crocodile clip of the second aviation plug connection line;

The power supply control end is provided with a variable frequency AC power supply module for outputting AC power of the same amplitude but different frequencies. The power supply control end is also provided with a power supply branch connected to the wiring jack of the first aviation plug connection line, and controls the power supply branch to be connected to the positive or negative pole of the variable frequency AC power supply module, and only one power supply branch is connected to the positive pole of the variable frequency AC power supply module at a time;

The detection processing end is provided with a detection branch connected to the wiring jack of the second aviation plug connecting line, and each detection branch is provided with an amplitude-frequency detection module for collecting voltage amplitude and frequency; the detection processing end matches the detection branch corresponding to the power supply branch connected to the wire core according to the voltage amplitude and frequency output by the variable frequency AC power supply module and the voltage amplitude and frequency detected by the amplitude-frequency detection module, and outputs the verified wire core.

As a preferred embodiment of the technical solution of the present invention, the power supply control end is provided with a plurality of power supply branches corresponding to the wiring holes of the first aviation plug connection line, and controls the corresponding power supply branches to be connected to the positive or negative pole of the variable frequency AC power supply module in sequence;

The detection processing end is provided with a plurality of detection branch paths corresponding to the wiring holes of the second aviation plug connection line, and each detection branch path is provided with an amplitude-frequency detection module.

As a preferred embodiment of the technical solution of the present invention, each power supply branch is provided with a switch control unit, the switch control unit is connected to the first single-chip microcomputer, and the variable frequency AC power supply module is connected to the first single-chip microcomputer; the common end of each switch control unit is connected to a wiring jack of the first aviation plug connecting line, the normally closed end of the switch control unit is connected to the negative pole of the variable frequency AC power supply module, and the normally open end of the switch control unit is connected to the positive pole of the variable frequency AC power supply module.

As a preferred embodiment of the technical solution of the present invention, the power supply control end includes a first shell, on which is disposed a first display module connected to the first single-chip microcomputer, and the first display module is used to display specific control information of the first single-chip microcomputer-controlled switch control unit.

As a preferred embodiment of the technical solution of the present invention, each detection branch is provided with a resistor, and the amplitude-frequency detection module is connected in parallel with the resistor; the amplitude-frequency detection module is also connected to a second single-chip microcomputer, and the first single-chip microcomputer is connected to the second single-chip microcomputer; the first single-chip microcomputer controls the switch control unit to operate and sends trigger information to the second single-chip microcomputer to control the amplitude-frequency detection module to start the detection of the voltage amplitude and frequency;

The first end of each resistor is connected to a wiring hole of the second aviation plug connecting wire, and the second ends of the resistors on all the detection branches are connected.

As a preferred embodiment of the technical solution of the present invention, the detection and processing end includes a second shell, on which is provided a second display module connected to the second single-chip computer, and the second display module is used to display the connection status of the switch control unit, the voltage amplitude and frequency detected by the amplitude-frequency detection module, and the core line result.

As a preferred embodiment of the technical solution of the present invention, the amplitude-frequency detection module includes a voltage amplitude detection unit and a power frequency detection unit connected to the second single-chip microcomputer.

As a preferred embodiment of the technical solution of the present invention, a first circuit board is arranged in the first housing, and the first single-chip microcomputer and the switch control unit are arranged on the first circuit board; an aviation plug interface plugged with the first aviation plug connection line is arranged on the first housing;

A second circuit board is arranged in the second shell, and the first resistor and the amplitude-frequency detection module are both arranged on the second circuit board; an aviation plug interface for plugging with the second aviation plug connection line is also arranged on the second shell.

In a second aspect, the technical solution of the present invention also provides a secondary cable core verification method based on voltage amplitude and frequency detection, comprising the following steps:

Plug the first aviation plug connection line into the power supply control end, plug the second aviation plug connection line into the detection processing end, connect the alligator clips of the first aviation plug connection line to one end of the secondary cable core to be checked, and connect the alligator clips of the second aviation plug connection line to the other end of the secondary cable core to be checked;

When all parts are connected, the normally closed terminals of the switch control unit are connected to the negative pole of the variable frequency AC power supply, and the switch control unit is controlled to operate so that the common terminal of the switch control unit is connected to the normally open terminal, thereby connecting the corresponding power supply branch to the positive pole of the variable frequency AC power supply. At the same time, the variable frequency AC power supply sequentially outputs the same amplitude double frequency voltage, and when the next power supply branch is connected to the positive pole of the variable frequency AC power supply, the previous power supply branch is restored to the state of being connected to the negative pole of the variable frequency AC power supply, and only one power supply branch is always connected to the positive pole of the variable frequency AC power supply;

When each power supply branch is connected to the positive pole of the variable frequency AC power supply, the amplitude and frequency detection modules of each detection branch at the detection processing end detect the voltage amplitude and frequency of each detection branch in real time;

According to the frequency detection result, the power supply branch corresponding to the secondary cable core to be checked connected to the power supply control end is determined, and the detection branch with the largest voltage amplitude at the detection processing end is obtained; then it is determined that the core connected to the power supply branch and the core connected to the detection branch are the two ends of the same core.

The method also includes: the detection processing end displays the detection result and the epipolar line result on the second display module.

It can be seen from the above technical solutions that the present invention has the following advantages:

1. The secondary cable core verification device is easy to operate and convenient to connect. The connection between the aviation plug connection line and the detection and processing end and the power supply control end adopts the aviation plug design, and the connection part with the cable core adopts the alligator clip design, which makes the connection process convenient and fast. Moreover, the cable core does not need to be connected to the aviation plug connection line in a specific order, and the complete "blind connection" does not affect the core line function, which greatly improves the work efficiency.

Second, the secondary cable core verification device is easy to carry and can be operated by one person. The main functions of the device are realized by high-performance single-chip microcomputers or integrated circuits. Both the detection and processing end and the power supply control end can be driven by power modules without external wired power supply. In addition, the overall size of the device is small, which is very convenient to use in multi-location and multi-scene transfer work.

3. The wire core verification results of the secondary cable core verification device are accurate and stable. The wire core verification process is achieved by switching the circuit structure and the power supply frequency. The wire core verification is performed under the state of a steady-state circuit with high accuracy and is not affected by external interference signals or grounding conditions at the work site.

Fourth, the secondary cable core checking device is low-cost and economical. The core line principle of the device does not require the use of various expensive and precise signal generating and receiving equipment, and the manufacturing cost is relatively low and the economy is good.

In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect.

It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG. 1 is a connection diagram of a device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the structure of an aviation plug connecting wire in an embodiment of the present invention.

FIG. 3 is a schematic diagram of the external structure of the detection processing end in an embodiment of the present invention.

FIG. 4 is a schematic diagram of an equivalent circuit of a core line in an embodiment of the present invention.

FIG. 5 is an equivalent circuit of a 4-core cable core line in an embodiment of the present invention.

FIG. 6 is an equivalent circuit when T2 is turned on in a 4-core cable core line according to an embodiment of the present invention.

FIG. 7 is a schematic flow chart of a method in an embodiment of the present invention.

In the figure, 20 is a shell, 21 is a display module, 201 is an aviation plug interface, 202 is an aviation plug shell, 203 is a flat cable, 204 is an alligator clip, and 205 is a numbered soft sleeve.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

As shown in FIG1 , an embodiment of the present invention provides a secondary cable core verification device based on voltage amplitude and frequency detection, including a power supply control end and a detection processing end; the power supply control end is connected to a first aviation plug connection line, the detection processing end is connected to a second aviation plug connection line, and the first aviation plug connection line and the second aviation plug connection line are respectively provided with alligator clips; the power supply control end is connected to one end of a secondary cable core to be verified through the alligator clip of the first aviation plug connection line, and the other end of the secondary cable core to be verified is connected to the detection processing end through the alligator clip of the second aviation plug connection line;

The power supply control end is provided with a variable frequency AC power supply module for outputting AC power of the same amplitude but different frequencies. The power supply control end is also provided with a power supply branch connected to the wiring jack of the first aviation plug connection line, and controls the power supply branch to be connected to the positive or negative pole of the variable frequency AC power supply module, and only one power supply branch is connected to the positive pole of the variable frequency AC power supply module at a time;

The detection processing end is provided with a detection branch connected to the wiring jack of the second aviation plug connecting line, and each detection branch is provided with an amplitude-frequency detection module for collecting voltage amplitude and frequency; the detection processing end matches the detection branch corresponding to the power supply branch connected to the wire core according to the voltage amplitude and frequency output by the variable frequency AC power supply module and the voltage amplitude and frequency detected by the amplitude-frequency detection module, and outputs the verified wire core.

In some embodiments, the power supply control end is provided with multiple power supply branches corresponding to the wiring holes of the first aviation plug connection line, and controls the corresponding power supply branches to be connected to the positive or negative pole of the variable frequency AC power supply module in turn; the detection processing end is provided with multiple detection branches corresponding to the wiring holes of the second aviation plug connection line, and each detection branch is provided with an amplitude-frequency detection module.

In some embodiments, each power supply branch is provided with a switch control unit, the switch control unit is connected to the first single-chip microcomputer, and the variable frequency AC power supply module is connected to the first single-chip microcomputer; the common end of each switch control unit is connected to a wiring jack of the first aviation plug connecting line, the normally closed end of the switch control unit is connected to the negative pole of the variable frequency AC power supply module, and the normally open end of the switch control unit is connected to the positive pole of the variable frequency AC power supply module.

In some embodiments, the power supply control terminal includes a first housing, on which a first display module connected to a first single-chip microcomputer is disposed, and the first display module is used to display specific control information of the switch control unit controlled by the first single-chip microcomputer. Each detection branch is provided with a resistor, and the amplitude-frequency detection module is connected in parallel with the resistor; the amplitude-frequency detection module is also connected to a second single-chip microcomputer, and the first single-chip microcomputer is connected to the second single-chip microcomputer; while the first single-chip microcomputer controls the switch control unit to operate, it sends trigger information to the second single-chip microcomputer to control the amplitude-frequency detection module to start the detection of the voltage amplitude and frequency;

The first end of each resistor is connected to a wiring hole of the second aviation plug connecting wire, and the second ends of the resistors on all the detection branches are connected.

The detection processing end includes a second housing, on which a second display module connected to the second single-chip microcomputer is disposed, and the second display module is used to display the connection status of the switch control unit, the voltage amplitude and frequency detected by the amplitude-frequency detection module, and the core line result. The amplitude-frequency detection module includes a voltage amplitude detection unit and a power frequency detection unit connected to the second single-chip microcomputer.

A first circuit board is arranged in the first shell, and a first single-chip microcomputer and a switch control unit are arranged on the first circuit board; an aviation plug interface plugged with a first aviation plug connection line is arranged on the first shell; a second circuit board is arranged in the second shell, and a first resistor and an amplitude-frequency detection module are both arranged on the second circuit board; an aviation plug interface plugged with a second aviation plug connection line is also arranged on the second shell.

It should be noted that the aviation plug connection line in the embodiment of the present invention includes a first aviation plug connection line and a second aviation plug connection line, which have the same structure. As shown in FIG2 , the aviation plug connection line specifically includes an aviation plug interface 201, an aviation plug housing 202, a flat cable 203, an alligator clip 204, and a numbered soft sleeve 205 sleeved on each wire core. The power supply control end and the detection processing end have similar appearance structures. For example, the detection processing end is shown in FIG3 , and a display module 21 and an aviation plug interface 201 are provided on the housing 20.

One end of the aviation plug connection line is connected to the power supply control end and the detection and processing end in the form of an aviation plug interface, and the other end is a number of crocodile clip test lines, which clamp the cable core to be checked for connection. The middle part adopts a cable arrangement design to prevent the test line from being tangled and messy. In order to clearly indicate the corresponding relationship between the cores of the cable to be tested, the test crocodile clips connected to the cores are numbered and marked with numbered soft sleeves 205. When the number of connection holes of the aviation plug connection line in this device is 26, the crocodile clips at the detection and processing end are marked with letter numbers a...z, and the crocodile clips at the power supply control end are marked with digital numbers 1...26. In this way, each cable core clamped by the crocodile clip has a unique number. After the aviation plug connection line is connected to the power supply control end, the detection and processing end and the cable core respectively, the core line equivalent circuit in Figure 4 can be obtained. Each crocodile clip test line is connected to a branch in the power supply control end and the detection and processing end through the jack in the aviation plug.

The appearance of the detection and processing end is shown in Figure 3. The surface is a touch screen for adjusting parameters and displaying the results of the wire core verification. There is an aviation plug interface at the bottom, which needs to be connected to the aviation plug connection line when the wire core is verified. The inside is an integrated circuit board, and each detection branch corresponds to the wiring jack in the aviation socket. As shown in Figure 4, the structure of each internal detection branch is divided into two parts: resistor R and amplitude-frequency detection module. The amplitude-frequency detection module can detect the amplitude and frequency of the AC voltage at both ends of R. The internal resistance of the amplitude-frequency detection module is very large, which is similar to an open circuit state.

The power supply control end and the detection and processing end have the same appearance, but different internal structures. The equivalent circuit of the power supply control end is shown in FIG4. There are also multiple power supply branches corresponding to the aviation plug wiring holes in the equivalent circuit of the power supply control end. The power supply branch is controlled by the first single-chip microcomputer according to the programming program by the switch control unit T, and the corresponding power supply branch is connected to the positive or negative pole of the variable frequency AC power supply in turn. The variable frequency AC power supply is connected to the first single-chip microcomputer, and outputs a sinusoidal AC voltage of the same amplitude and different frequency when the circuit structure changes according to the control of the programming program.

The following will take a 4-core cable as an example, and combine with Figure 5 to illustrate the core line principle of the device. It is assumed that the aviation plug leads to 6 alligator clip test lines. The 6 alligator clip test lines at the detection and processing end are numbered: a...f, and the 6 alligator clip test lines at the power supply control end are numbered: 1...6, and each number also corresponds to a branch of the detection and processing end or the power supply control end. The detection and processing end and the power supply control end are inserted into the aviation plug, and the cable cores on both sides are connected with the alligator clips in any order, without having to be connected in a specific order. Figure 5 shows only one possible wiring method.

After all parts are connected, the circuit can be checked. The initial state of the circuit is that the switch control elements T1...T6 are all connected to the negative pole of the variable frequency AC power supply. After the circuit is checked, the first single-chip microcomputer programming program at the power supply control end connects the 1...6 power supply branches to the positive pole of the variable frequency AC power supply in the order of T1...T6. At the same time, the variable frequency AC power supply outputs u(t)=Asin(ωt),...,u(t)=Asin(6ωt) with the same amplitude double frequency voltage. When the next branch is connected to the positive pole of the power supply, the previous branch is restored to the state of being connected to the negative pole of the variable frequency AC power supply, and only one branch is always connected to the positive pole of the variable frequency AC power supply. For example, in the first stage, T1 is connected to the positive pole of the power supply, and the power supply voltage is u(t)=Asin(ωt), and the other Ts are connected to the negative pole of the variable frequency AC power supply. In the next stage, T2 is connected to the positive pole of the variable frequency AC power supply, and the power supply voltage becomes u(t)=Asin(2ωt). T1 is restored to being connected to the negative pole of the variable frequency AC power supply, and the state of only T2 being connected to the positive pole of the variable frequency AC power supply is still maintained. And so on, until T6 is connected to the positive pole of the variable frequency AC power supply, the connected voltage is u(t)=Asin(6ωt), and the remaining Ts are connected to the negative pole of the power supply. Every time the circuit structure of the power supply control end changes, the amplitude and frequency detection modules of each detected branch at the detection processing end detect the voltage amplitude and frequency at both ends of the resistor R of each detection branch in real time. For example, when T1 is connected to the positive power supply, since there is no current loop, there is no voltage at the detection processing end, and the amplitude and frequency detection module has no measurement result. At this time, it means that the No. 1 alligator clip has no connection wire core. When the T2 contact is connected to the positive pole of the variable frequency AC power supply, the circuit is connected, and the equivalent circuit is shown in Figure 6. At this time, the amplitude and frequency detection modules of branches a, b, d, and f can all measure the voltage with a frequency of 2ω, but the voltage amplitude detection results are different. According to the equivalent circuit of Figure 6, since branch a is connected in series with the parallel structure of branches b, d, and f, the voltage amplitude at both ends of R in branch a is the largest. According to the voltage frequency detection result of 2ω, it can be determined that the core connected to the power supply control end is the core clamped by the No. 2 alligator clip, and the core corresponding to the detection processing end is the core of the branch with the largest voltage amplitude connected to the No. a alligator clip. Therefore, it is determined that a and 2 are the two ends of the same core, thus completing the verification of one core. The verification process of the remaining cores is exactly the same. When all branches of T1...T6 are connected to the positive pole of the variable frequency AC power supply, the core line process of all cores is completed. All action sequences and results are shown in Table 1.

Table 1

According to the voltage amplitude-frequency detection results in Table 1, the correspondence between all 4-core cables at both ends of the cable can be determined. The principle of the core wire of the cable with more cores is the same as that of the 4-core cable in this example. It only needs to integrate more detection branches in the detection processing end and the power supply control end, and increase the output frequency range of the power supply voltage.

As shown in FIG. 7 , an embodiment of the present invention further provides a secondary cable core verification method based on voltage amplitude and frequency detection, comprising the following steps:

Step 1: Plug the first aviation plug connection line into the power supply control end, plug the second aviation plug connection line into the detection processing end, connect the alligator clips of the first aviation plug connection line to one end of the secondary cable core to be checked, and connect the alligator clips of the second aviation plug connection line to the other end of the secondary cable core to be checked;

Step 2: After all parts are wired, the normally closed terminals of the switch control units are connected to the negative pole of the variable frequency AC power supply, and the switch control units are controlled to operate in sequence so that the common terminal of the switch control units is connected to the normally open terminal, thereby connecting the corresponding power supply branches to the positive pole of the variable frequency AC power supply. At the same time, the variable frequency AC power supply outputs the same amplitude double frequency voltage in sequence, and when the next power supply branch is connected to the positive pole of the variable frequency AC power supply, the previous power supply branch is restored to the state of being connected to the negative pole of the variable frequency AC power supply, and only one power supply branch is always connected to the positive pole of the variable frequency AC power supply;

Step 3: When each power supply branch is connected to the positive pole of the variable frequency AC power supply, the amplitude and frequency detection module of each detection branch at the detection processing end detects the voltage amplitude and frequency of each detection branch in real time;

Step 4: Determine the power supply branch corresponding to the secondary cable core to be checked connected to the power supply control end according to the frequency detection result, and at the same time obtain the detection branch with the largest voltage amplitude at the detection processing end; and then determine that the core connected to the power supply branch and the core connected to the detection branch are the two ends of the same core.

Step 5: The detection processing end displays the detection results and epipolar line results on the second display module.

The following will take a 4-core cable as an example, and combine with Figure 5 to illustrate the core line principle of the device. It is assumed that the aviation plug leads to 6 alligator clip test lines. The 6 alligator clip test lines at the detection and processing end are numbered: a...f, and the 6 alligator clip test lines at the power supply control end are numbered: 1...6, and each number also corresponds to a branch of the detection and processing end or the power supply control end. The detection and processing end and the power supply control end are inserted into the aviation plug, and the cable cores on both sides are connected with the alligator clips in any order, without having to be connected in a specific order. Figure 5 shows only one possible wiring method.

After all parts are connected, the circuit can be checked. The initial state of the circuit is that the switch control elements T1...T6 are all connected to the negative pole of the variable frequency AC power supply. After the circuit is checked, the first single-chip microcomputer programming program at the power supply control end connects the 1...6 power supply branches to the positive pole of the variable frequency AC power supply in the order of T1...T6. At the same time, the variable frequency AC power supply outputs u(t)=Asin(ωt),...,u(t)=Asin(6ωt) with the same amplitude double frequency voltage. When the next branch is connected to the positive pole of the power supply, the previous branch is restored to the state of being connected to the negative pole of the variable frequency AC power supply, and only one branch is always connected to the positive pole of the variable frequency AC power supply. For example, in the first stage, T1 is connected to the positive pole of the power supply, and the power supply voltage is u(t)=Asin(ωt), and the other Ts are connected to the negative pole of the variable frequency AC power supply. In the next stage, T2 is connected to the positive pole of the variable frequency AC power supply, and the power supply voltage becomes u(t)=Asin(2ωt). T1 is restored to being connected to the negative pole of the variable frequency AC power supply, and the state of only T2 being connected to the positive pole of the variable frequency AC power supply is still maintained. And so on, until T6 is connected to the positive pole of the variable frequency AC power supply, the connected voltage is u(t)=Asin(6ωt), and the remaining Ts are connected to the negative pole of the power supply. Every time the circuit structure of the power supply control end changes, the amplitude and frequency detection modules of each detected branch at the detection processing end detect the voltage amplitude and frequency at both ends of the resistor R of each detection branch in real time. For example, when T1 is connected to the positive power supply, since there is no current loop, there is no voltage at the detection processing end, and the amplitude and frequency detection module has no measurement result. At this time, it means that the No. 1 alligator clip has no connection wire core. When the T2 contact is connected to the positive pole of the variable frequency AC power supply, the circuit is connected, and the equivalent circuit is shown in Figure 6. At this time, the amplitude and frequency detection modules of branches a, b, d, and f can all measure the voltage with a frequency of 2ω, but the voltage amplitude detection results are different. According to the equivalent circuit of Figure 6, since branch a is connected in series with the parallel structure of branches b, d, and f, the voltage amplitude at both ends of R in branch a is the largest. According to the voltage frequency detection result of 2ω, it can be determined that the core connected to the power supply control end is the core clamped by the No. 2 alligator clip, and the core corresponding to the detection processing end is the core of the branch with the largest voltage amplitude connected to the No. a alligator clip. Therefore, it is determined that a and 2 are the two ends of the same core, thus completing the verification of one core. The verification process of the remaining cores is exactly the same. When all branches of T1...T6 are connected to the positive pole of the variable frequency AC power supply, the core process of all cores is completed.

Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims (10)

1. A secondary cable core checking device based on voltage amplitude and frequency detection, characterized in that it includes a power supply control end and a detection processing end; The power supply control end is connected to a first aviation plug connection line, the detection processing end is connected to a second aviation plug connection line, and the first aviation plug connection line and the second aviation plug connection line are respectively provided with crocodile clips; the power supply control end is connected to one end of the secondary cable core to be checked through the crocodile clip of the first aviation plug connection line, and the other end of the secondary cable core to be checked is connected to the detection processing end through the crocodile clip of the second aviation plug connection line; The power supply control end is provided with a variable frequency AC power supply module for outputting AC power of the same amplitude but different frequencies. The power supply control end is also provided with a power supply branch connected to the wiring jack of the first aviation plug connection line, and controls the power supply branch to be connected to the positive or negative pole of the variable frequency AC power supply module, and only one power supply branch is connected to the positive pole of the variable frequency AC power supply module at a time; The detection processing end is provided with a detection branch connected to the wiring jack of the second aviation plug connecting line, and each detection branch is provided with an amplitude-frequency detection module for collecting voltage amplitude and frequency; the detection processing end matches the detection branch corresponding to the power supply branch connected to the wire core according to the voltage amplitude and frequency output by the variable frequency AC power supply module and the voltage amplitude and frequency detected by the amplitude-frequency detection module, and outputs the verified wire core. 2. The secondary cable core verification device based on voltage amplitude and frequency detection according to claim 1 is characterized in that the power supply control end is provided with a plurality of power supply branches corresponding to the wiring holes of the first aviation plug connection line, and controls the corresponding power supply branches to be connected to the positive or negative pole of the variable frequency AC power supply module in turn; The detection processing end is provided with a plurality of detection branch paths corresponding to the wiring holes of the second aviation plug connection line, and each detection branch path is provided with an amplitude-frequency detection module. 3. According to the secondary cable core verification device based on voltage amplitude and frequency detection as described in claim 2, it is characterized in that each power supply branch is provided with a switch control unit, the switch control unit is connected to the first single-chip microcomputer, the common end of each switch control unit is connected to a wiring jack of the first aviation plug connecting line, the normally closed end of the switch control unit is connected to the negative pole of the variable frequency AC power supply module, and the normally open end of the switch control unit is connected to the positive pole of the variable frequency AC power supply module. 4. According to the secondary cable core verification device based on voltage amplitude and frequency detection according to claim 3, it is characterized in that the power supply control end includes a first shell, and a first display module connected to the first single-chip microcomputer is provided on the first shell, and the first display module is used to display specific control information of the switch control unit controlled by the first single-chip microcomputer. 5. The secondary cable core checking device based on voltage amplitude and frequency detection according to claim 4 is characterized in that each detection branch is provided with a resistor, and the amplitude and frequency detection module is connected in parallel with the resistor; the amplitude and frequency detection module is also connected to a second single-chip microcomputer, and the first single-chip microcomputer is connected to the second single-chip microcomputer; the first single-chip microcomputer controls the switch control unit to operate and sends trigger information to the second single-chip microcomputer to control the amplitude and frequency detection module to start the voltage amplitude and frequency detection; The first end of each resistor is connected to a wiring hole of the second aviation plug connecting wire, and the second ends of the resistors on all the detection branches are connected. 6. According to the secondary cable core verification device based on voltage amplitude and frequency detection according to claim 5, it is characterized in that the detection processing end includes a second shell, and a second display module connected to the second single-chip computer is provided on the second shell, and the second display module is used to display the connection status of the switch control unit, the voltage amplitude and frequency detected by the amplitude and frequency detection module, and the core line result. 7. The secondary cable core verification device based on voltage amplitude and frequency detection according to claim 6 is characterized in that the amplitude and frequency detection module includes a voltage amplitude detection unit and a power supply frequency detection unit connected to the second single-chip microcomputer. 8. The secondary cable core checking device based on voltage amplitude and frequency detection according to claim 7 is characterized in that a first circuit board is arranged in the first housing, and a first single-chip microcomputer and a switch control unit are arranged on the first circuit board; an aviation plug interface plugged with a first aviation plug connection line is arranged on the first housing; A second circuit board is arranged in the second shell, and the first resistor and the amplitude-frequency detection module are both arranged on the second circuit board; an aviation plug interface for plugging with the second aviation plug connection line is also arranged on the second shell. 9. A secondary cable core verification method based on voltage amplitude and frequency detection, characterized in that it includes the following steps: Plug the first aviation plug connection line into the power supply control end, plug the second aviation plug connection line into the detection processing end, connect the alligator clips of the first aviation plug connection line to one end of the secondary cable core to be checked, and connect the alligator clips of the second aviation plug connection line to the other end of the secondary cable core to be checked; When all parts are connected, the normally closed terminals of the switch control units are connected to the negative pole of the variable frequency AC power supply, and the switch control units are controlled to operate in sequence so that the common terminal of the switch control units is connected to the normally open terminal, thereby connecting the corresponding power supply branches to the positive pole of the variable frequency AC power supply. At the same time, the variable frequency AC power supply outputs the same amplitude double frequency voltage in sequence, and when the next power supply branch is connected to the positive pole of the variable frequency AC power supply, the previous power supply branch is restored to the state of being connected to the negative pole of the variable frequency AC power supply, and only one power supply branch is always connected to the positive pole of the variable frequency AC power supply; When each power supply branch is connected to the positive pole of the variable frequency AC power supply, the amplitude and frequency detection modules of each detection branch at the detection processing end detect the voltage amplitude and frequency of each detection branch in real time; According to the frequency detection result, the power supply branch corresponding to the secondary cable core to be checked connected to the power supply control end is determined, and the detection branch with the largest voltage amplitude at the detection processing end is obtained; then it is determined that the core connected to the power supply branch and the core connected to the detection branch are the two ends of the same core. 10. The secondary cable core verification method based on voltage amplitude and frequency detection according to claim 9, characterized in that the method further comprises: The detection processing end displays the detection result and the epipolar line result on the second display module.