Charged secondary cable identification device

Abstract

The invention discloses a live secondary cable identification device, which comprises a host and at least one slave wirelessly connected with the host, and is characterized in that the host comprises a switching module, a square wave signal module and a first communication module, and the slave comprises a direct current clamp meter, a second communication module and a slave controller, the plugging end of the switching module is electrically connected with the equipment connecting end of the secondary cable to be tested, and the output end of the switching module is electrically connected with the input end of the square wave signal module; the direct current clamp meter sleeves a to-be-tested secondary cable at a position opposite to an equipment connecting end, the square wave signal module is used for generating a square wave signal at one end of the to-be-tested secondary cable and collecting a first parameter corresponding to the square wave signal, and the direct current clamp meter is used for collecting a second parameter corresponding to the square wave signal at the other end of the to-be-tested secondary cable and collecting the second parameter corresponding to the square wave signal at the other end of the to-be-tested secondary cable. And the square wave signal module is used for comparing the first parameter with the second parameter obtained from the first communication module, and determining an identification result of the to-be-detected secondary cable according to a comparison result, thereby realizing verification of the electrified secondary cable.

Description

Technical Field

[0001] The present application belongs to the technical field of cable identification, and in particular relates to an identification device for live secondary cables. Background Art

[0002] In the power system, secondary cables refer to cables led out from the secondary side of primary equipment. Secondary cables are used to connect protection equipment, automation equipment, measuring equipment, etc. to realize the control, metering, and measurement functions of primary equipment. Therefore, secondary cables are important in the power system. When performing regular maintenance on the equipment in the power system, it is also necessary to conduct regular inspections of the secondary cables.

[0003] The inspection of secondary cables is mainly to check whether the cable connections are correct. Due to factors such as inadequate inspection by the operation and maintenance unit or changes in circuits during the implementation of anti-accident measures in previous years, the secondary cables in operation in the substation often have problems such as missing numbers or cable tags, or incorrect markings. When conducting regular protection inspections on the substation, the secondary cables cannot be checked according to the existing markings, and the connection of the secondary cables needs to be inspected, which greatly increases the workload of secondary cable verification.

[0004] The existing method for inspecting secondary cables is to remove the secondary cables and manually check the de-energized cables using a multimeter or a de-energized cable identification device. However, since the secondary cables are connected to some important protection devices and control devices, inspecting de-energized secondary cables increases the risk of misoperation of protection due to accidental removal of cables. Therefore, how to safely, quickly and accurately check the energized secondary cables has become a difficult problem that needs to be solved in power engineering. Summary of the invention

[0005] In view of this, the present application provides a device for identifying live secondary cables, the main purpose of which is to solve the problem that existing cable identification devices cannot verify live secondary cables.

[0006] In order to solve the above problems, the present application provides a device for identifying live secondary cables, the device comprising a host and at least one slave wirelessly connected to the host, the host comprising a switching module, a square wave signal module and a first communication module, the slave comprising a DC clamp meter, a second communication module and a slave controller, wherein:

[0007] The plug-in end of the adapter module is electrically connected to the device connection end of the secondary cable to be tested, and the output end of the adapter module is electrically connected to the first input end of the square wave signal module; the DC clamp meter is set on the secondary cable to be tested at a position opposite to the device connection end, the output end of the DC clamp meter is electrically connected to the input end of the slave controller, the output end of the slave controller is electrically connected to the input end of the second communication module, the output end of the second communication module is wirelessly connected to the input end of the first communication module, and the output end of the first communication module is electrically connected to the second input end of the square wave signal module;

[0008] The square wave signal module is used to generate a square wave signal at one end of the secondary cable to be tested, and collect a first parameter corresponding to the square wave signal. The DC clamp meter is used to collect a second parameter corresponding to the square wave signal at the other end of the secondary cable to be tested, and send the second parameter to the slave controller. The slave controller is used to send the second parameter to the first communication module through the second communication module. The first communication module is used to send the second parameter to the square wave signal module. The square wave signal module is used to compare the first parameter and the second parameter, and determine the identification result of the secondary cable to be tested according to the comparison result.

[0009] In one embodiment of the present application, optionally, the square wave signal module includes a square wave generating unit, a square wave collecting unit and a host controller, wherein:

[0010] The signal output end of the host controller is electrically connected to the signal input end of the square wave generating unit, the output end of the square wave generating unit is electrically connected to the first input end of the square wave collecting unit, the output end of the square wave collecting unit is electrically connected to the first input end of the host controller, and the second input end of the host controller is electrically connected to the output end of the first communication module; the power input end of the square wave generating unit and the second input end of the square wave collecting unit are electrically connected to the output end of the adapter module respectively.

[0011] In one embodiment of the present application, optionally, the host further includes a lithium battery power supply module, the output end of the adapter module includes a positive output end and a negative output end, the signal output end of the host controller includes a first signal output end and a second signal output end, and the square wave generating unit includes a first resistor, a second resistor, a third resistor, a first photoelectric isolator and a second photoelectric isolator, wherein,

[0012] The first signal output end of the host controller is electrically connected to the positive input end of the first photoelectric isolator, the negative input end of the first photoelectric isolator is electrically connected to the negative output end of the lithium battery power supply module, the first output end of the first photoelectric isolator is electrically connected to the positive output end of the adapter module and the first end of the first resistor, the second output end of the first photoelectric isolator is electrically connected to the second end of the first resistor and the second end of the second resistor, the second end of the second resistor is electrically connected to the first end of the third resistor and the first output end of the second photoelectric isolator, the second end of the third resistor is electrically connected to the second output end of the second photoelectric isolator and the first input end of the square wave collection unit, and the second input end of the square wave collection unit is electrically connected to the negative output end of the adapter module; the second signal output end of the host controller is electrically connected to the positive input end of the second photoelectric isolator, and the negative input end of the second photoelectric isolator is electrically connected to the negative output end of the lithium battery power supply module.

[0013] In one embodiment of the present application, optionally, the output end of the adapter module includes a positive output end and a negative output end, and the square wave acquisition unit includes a sampling resistor and an AD chip, wherein:

[0014] The first end of the sampling resistor is electrically connected to the output end of the square wave generating unit and the first differential input end of the AD chip, respectively; the second end of the sampling resistor is electrically connected to the second differential input end of the AD chip and the negative output end of the adapter module, respectively; and the output end of the AD chip is electrically connected to the first input end of the host controller.

[0015] In one embodiment of the present application, optionally, the host further includes a security protection module, and the security protection module includes a fourth resistor, a fifth resistor and a sixth resistor, wherein:

[0016] The fourth resistor, the fifth resistor and the sixth resistor are connected in series in sequence and in series between the positive output terminal and the negative output terminal of the adapter module, and the first end of the sixth resistor is electrically connected to the third differential input terminal of the AD chip, and the second end of the sixth resistor is electrically connected to the fourth differential input terminal of the AD chip.

[0017] In one embodiment of the present application, optionally, the DC clamp meter includes an output line and a first connecting component matching the output line, the output line is connected to a pluggable end of the first connecting component, and the output end of the first connecting component is electrically connected to the input end of the slave controller.

[0018] In one embodiment of the present application, optionally, the adapter module includes an adapter, a test lead, and a second connecting component matching the test lead, the input end of the adapter is pluggable connected to the device connection end of the secondary cable to be tested, the output end of the adapter is pluggable connected to the input end of the test lead, the output end of the test lead is pluggable connected to the input end of the second connecting component, and the output end of the second connecting component is electrically connected to the first input end of the square wave signal module.

[0019] In one embodiment of the present application, optionally, the host further includes a first LCD display module and a first voice prompt module, wherein:

[0020] When the first parameter is equal to the second parameter rate, the host controller sends correct matching information to the first LCD display module and the first voice prompt module; when the first parameter is not equal to the second parameter rate, the host controller sends incorrect matching information to the first LCD display module and the first voice prompt module.

[0021] In one embodiment of the present application, optionally, the slave device further includes a second LCD display module and a second voice prompt module, wherein:

[0022] The data input end of the second LCD display module is electrically connected to the second data output end of the slave controller; the data input end of the second voice prompt module is electrically connected to the third data output end of the slave controller.

[0023] In one embodiment of the present application, optionally, the lithium battery power supply module includes: a power input unit, a first power conversion unit, a charging management chip, a lithium battery, and a second power conversion module, wherein:

[0024] The output end of the power input unit is electrically connected to the input end of the first power conversion unit, the output end of the first power conversion unit is electrically connected to the enable end and the power input end of the charging management chip respectively, the battery connection end of the charging management chip is electrically connected to the positive end of the lithium battery and the positive input end of the second power conversion module, the negative end of the lithium battery is electrically connected to the negative input end of the second power conversion module, the output end of the second power conversion module is electrically connected to the power input end of the power input end of the host controller, and the input end of the power input unit is electrically connected to a DC power supply.

[0025] Beneficial effects of the present application: The present application provides a device for identifying a live secondary cable, wherein the host is connected to one end of the live secondary cable to be tested through a transfer module, and the slave is mounted on the other end of the secondary cable to be tested through a current clamp meter. The square wave signal module of the host generates a square wave signal at one end of the secondary cable to be tested, and detects a first parameter of the square wave signal. The slave collects a second parameter of the square wave signal at the other end of the secondary cable through the current clamp meter, and sends it to the slave controller. The slave controller sends the second parameter to the first communication module of the host through the second communication module, and the first communication module of the host sends the second parameter to the square wave signal module of the host. The square wave signal module compares the first parameter and the second parameter. When the first parameter is the same as the second parameter, it indicates that the secondary cable to be tested is correctly connected, thereby realizing the verification of the live secondary cable and improving the verification efficiency and accuracy of the secondary cable.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A structural block diagram of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0029] Figure 2 A schematic diagram of the circuit structure of a host of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0030] Figure 3 A schematic diagram of the circuit structure of a first display module of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0031] Figure 4 A schematic diagram of the circuit structure of a lithium battery power supply module of a device for identifying a charged secondary cable according to an exemplary embodiment of the present application;

[0032] Figure 5 A schematic diagram of the circuit structure of a first communication module of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0033] Figure 6A structural block diagram of a host of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0034] Figure 7 A structural block diagram of a slave device of a device for identifying a live secondary cable according to an exemplary embodiment of the present application;

[0035] Figure 8 This is a structural diagram of a connection between a live secondary cable identification device and a secondary cable to be tested according to an exemplary embodiment of the present application;

[0036] Fig. 9 This is another connection structure diagram of a device for identifying a live secondary cable and a secondary cable to be tested according to an exemplary embodiment of the present application;

[0037] Fig.10 This is another connection structure diagram of a device for identifying a live secondary cable and a secondary cable to be tested according to an exemplary embodiment of the present application.

[0038] in,

[0039] Figure 1-Figure 10 The numbers are as follows: 1-host; 2-slave; 11-transfer module; 12-square wave signal module; 13-first communication module; 21-current clamp meter; 22-slave controller; 23-second communication module; 30-secondary cable to be tested; 40-equipment; 121-square wave generating unit; 122-square wave acquisition unit; 14-first LCD display module; 26-first voice prompt module; 14-second LCD display module; 26-second voice prompt module; R1-first resistor; R2-second resistor; R3-third resistor; R4-adopting resistor; R5-fourth resistor; R6-fifth resistor; R7-sixth resistor; G1-first photoelectric isolator; G2-second photoelectric isolator; U1-host controller; U2-AD chip; U3-first power conversion unit; U4-charging management chip; U5-second power conversion module; BAT1-lithium battery. DETAILED DESCRIPTION

[0040] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0041] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0042] Combine the following Figures 1 to 10 A device for identifying a live secondary cable according to some embodiments of the present application is described.

[0043] In one embodiment, Figure 1 As shown, a device for identifying a live secondary cable includes a host 1 and at least one slave 2 wirelessly connected to the host 1, the host 1 includes a switching module 11, a square wave signal module 12 and a first communication module 13, and the slave 2 includes a DC clamp meter 21, a second communication module 23 and a slave controller 22, wherein:

[0044] The plug-in end of the adapter module 11 is electrically connected to the connection end of the device 40 of the secondary cable 30 to be tested, and the output end of the adapter module 11 is electrically connected to the first input end of the square wave signal module 12; the DC clamp meter 21 is set on the secondary cable 30 to be tested at a position opposite to the connection end of the device 40, the output end of the DC clamp meter 21 is electrically connected to the input end of the slave controller 22, the output end of the slave controller 22 is electrically connected to the input end of the second communication module 23, the output end of the second communication module 23 is wirelessly connected to the input end of the first communication module 13, and the output end of the first communication module 13 is electrically connected to the second input end of the square wave signal module 12;

[0045] The square wave signal module 12 is used to generate a square wave signal at one end of the secondary cable 30 to be tested, and collect a first parameter corresponding to the square wave signal. The DC clamp meter 21 is used to collect a second parameter corresponding to the square wave signal at the other end of the secondary cable 30 to be tested, and send the second parameter to the slave controller 22. The slave controller 22 is used to send the second parameter to the first communication module 13 through the second communication module 23. The first communication module 13 is used to send the second parameter to the square wave signal module 12. The square wave signal module 12 is used to compare the first parameter and the second parameter, and determine the identification result of the secondary cable 30 to be tested according to the comparison result.

[0046] Specifically, the adapter module of the cable identification device host is connected to the terminal on the air switch side of the secondary cable protection device, and the DC current clamp of the cable identification device slave is clamped on the two power lines on the DC feeder screen air switch side of the secondary cable. The square wave signal module of the cable identification device host will generate a square wave current signal of a specific frequency, which is transmitted along the secondary cable to the location of the cable identification device slave. The square wave signal module detects the first parameter of the generated square wave signal, such as the current value and frequency. The DC current clamp meter of the identification device slave can detect the second parameter of the square wave signal flowing through the secondary cable, and transmit it to the first communication module through the second communication module. The first communication module then transmits it to the square wave signal module. The square wave signal module compares the first parameter and the second parameter. If the first parameter and the second parameter are the same, the cable between the identification device host and the slave is the same cable.

[0047] It should be noted that the current value of the square wave signal output by the DC clamp meter is read from the machine controller, and the magnitude of the current value output by the DC clamp meter is counted to obtain the frequency of the square wave signal.

[0048] It should be noted that the first communication module and the second communication module are set to point-to-point communication mode, which can effectively avoid interference from similar devices on site. And the communication distance is greater than 1000m

[0049] In one embodiment, the cable identification device slave is provided with two DC current clamp meters, which are respectively mounted on the positive cable and the negative cable of a group of secondary cables, and the magnitude and frequency of the current measured by the two DC current clamps of the cable identification device slave are compared. If the magnitude and frequency of the current are consistent, the two lines are one positive and one negative output line of the same circuit.

[0050] Compared with the prior art, the present application provides a device for identifying a live secondary cable, wherein a host is connected to one end of a live secondary cable to be tested through a transfer module, and a slave is mounted on the other end of the secondary cable to be tested through a current clamp meter. A square wave signal module of the host generates a square wave signal at one end of the secondary cable to be tested, and detects a first parameter of the square wave signal. The slave collects a second parameter of the square wave signal at the other end of the secondary cable through the current clamp meter, and sends it to a slave controller. The slave controller sends the second parameter to the first communication module of the host through a second communication module, and the first communication module of the host sends the second parameter to the square wave signal module of the host. The square wave signal module compares the first parameter and the second parameter. When the first parameter is the same as the second parameter, it indicates that the secondary cable to be tested is correctly connected, thereby realizing the verification of the live secondary cable and improving the verification efficiency and accuracy of the secondary cable.

[0051] In one embodiment, the square wave signal module 12 includes a square wave generating unit 121, a square wave collecting unit 122 and a host controller U1, wherein:

[0052] The signal output end of the host controller U1 is electrically connected to the signal input end of the square wave generating unit 121, the output end of the square wave generating unit 121 is electrically connected to the first input end of the square wave collecting unit 122, the output end of the square wave collecting unit 122 is electrically connected to the first input end of the host controller U1, and the second input end of the host controller U1 is electrically connected to the output end of the first communication module 13; the power input end of the square wave generating unit 121 and the second input end of the square wave collecting unit 122 are electrically connected to the output end of the adapter module 11 respectively.

[0053] In this embodiment, when the live secondary cable is connected to the square wave generating module, the host controller sends a control signal to the square wave generating unit, and the square wave generating unit generates a square wave signal on the secondary cable. The square wave signal flows to the other end of the secondary cable and reaches the location of the identification device slave. The square wave acquisition unit collects the first parameter of the square wave signal generated by the square wave generating unit, such as the current value and frequency of the square wave signal.

[0054] In one embodiment, Figure 2 As shown, the host 1 also includes a lithium battery power supply module, the output end of the adapter module 11 includes a positive output end and a negative output end, the signal output end of the host controller U1 includes a first signal output end and a second signal output end, and the square wave generating unit 121 includes a first resistor R1, a second resistor R2, a third resistor R3, a first photoelectric isolator G1 and a second photoelectric isolator G2, wherein,

[0055] The first signal output end of the host controller U1 is electrically connected to the positive input end of the first photoelectric isolator G1, the negative input end of the first photoelectric isolator G1 is electrically connected to the negative output end of the lithium battery power supply module, the first output end of the first photoelectric isolator G1 is electrically connected to the positive output end of the adapter module 11 and the first end of the first resistor R1, respectively, the second output end of the first photoelectric isolator G1 is electrically connected to the second end of the first resistor R1 and the second end of the second resistor R2, respectively, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3 and the first output end of the second photoelectric isolator G2, the second end of the third resistor R3 is electrically connected to the second output end of the second photoelectric isolator G2 and the first input end of the square wave collection unit 122, and the second input end of the square wave collection unit 122 is electrically connected to the negative output end of the adapter module 11; the second signal output end of the host controller U1 is electrically connected to the positive input end of the second photoelectric isolator G2, and the negative input end of the second photoelectric isolator G2 is electrically connected to the negative output end of the lithium battery power supply module.

[0056] Specifically, the closing or disconnection of the first photoelectric isolator and the second photoelectric isolator is controlled by the host controller. In a specific embodiment, the first resistor is 200Ω, the second resistor is 2000Ω, and the third resistor is 2400Ω. The first photoelectric isolator and the second photoelectric isolator are not closed or disconnected at the same time. When the first photoelectric isolator is closed and the second photoelectric isolator is disconnected, the resistors connected in series to the branch are the second resistor and the third resistor, with a total resistance of 4400Ω, and the branch current is about 50mA; when the first photoelectric isolator is disconnected and the second photoelectric isolator is closed, the resistors connected in series to the branch are the first resistor and the second resistor, with a total resistance of 2200Ω, and the branch current is about 100mA. According to the opening or closing of the first photoelectric isolator and the second photoelectric isolator, a square wave current signal can be generated. The host controller controls the frequency of the opening and closing of the first photoelectric isolator and the second photoelectric isolator, so as to change the frequency of the square wave current signal.

[0057] In one embodiment, see Figure 2 The output end of the adapter module 11 includes a positive output end and a negative output end, and the square wave acquisition unit 122 includes a sampling resistor R4 and an AD chip U2, wherein:

[0058] The first end of the sampling resistor R4 is electrically connected to the output end of the square wave generating unit 121 and the first differential input end of the AD chip U2, respectively. The second end of the sampling resistor R4 is electrically connected to the second differential input end of the AD chip U2 and the negative output end of the adapter module 11, respectively. The output end of the AD chip U2 is electrically connected to the first input end of the host controller U1.

[0059] Specifically, the sampling resistor is connected in series with the first resistor, the second resistor and the third resistor, and is connected in series with the positive output terminal and the negative output terminal of the adapter module to collect the current signal on the branch. The AD chip uses a differential method to collect the voltage across the sampling resistor, and converts it into a current value flowing through the sampling resistor according to the resistance value of the sampling resistor, thereby obtaining the current value of the square wave signal, and the host controller counts the current value output by the AD chip to obtain the frequency of the square wave signal.

[0060] In one embodiment, see Figure 2 The host 1 also includes a security protection module, which includes a fourth resistor R5, a fifth resistor R6 and a sixth resistor R7, wherein:

[0061] The fourth resistor R5, the fifth resistor R6 and the sixth resistor R7 are connected in series in sequence and in series between the positive output terminal and the negative output terminal of the adapter module 11, and the first end of the sixth resistor R7 is electrically connected to the third differential input terminal of the AD chip U2, and the second end of the sixth resistor R7 is electrically connected to the fourth differential input terminal of the AD chip U2.

[0062] Specifically, in order to avoid short circuit of the host instrument, a safety protection module is added. When the host is turned on, a power-on self-check is performed through the safety protection module. After the self-check is normal, the host enters the working state.

[0063] In one embodiment, the DC clamp meter 21 includes an output line and a first connecting component matching the output line, the output line is connected to a pluggable end of the first connecting component, and the output end of the first connecting component is electrically connected to the input end of the slave controller 22.

[0064] Specifically, in this embodiment, the DC clamp meter is a prior art, and its working principle is not described in detail here. It should be noted that a DC clamp meter with a transmission line similar to an ultrasonic probe is selected, and a first connecting component matching and connecting with the output line is provided on the slave. Through the output line and the first connecting component of the DC clamp meter, the slave controller can read the second parameter of the square wave signal detected by the DC clamp meter.

[0065] In one embodiment, the adapter module 11 includes an adapter, a test lead, and a second connecting component matching the test lead. The input end of the adapter is pluggable connected to the connection end of the device 40 of the secondary cable 30 to be tested, the output end of the adapter is pluggable connected to the input end of the test lead, the output end of the test lead is pluggable connected to the input end of the second connecting component, and the output end of the second connecting component is electrically connected to the first input end of the square wave signal module 12.

[0066] Specifically, the adapter includes a metal rod and a shell that wraps the metal rod. The metal rod at the bottom is provided with a thread, and the adapter is plugged into the terminal connecting the secondary cable and the device through the thread on the metal rod. A sleeve is provided in the shell. When the tip of the test pen is inserted into the top of the shell, the tip is clamped on the adapter through the sleeve in the shell, and the tip is connected to the metal rod. The output end of the test pen is connected to the second connecting component. Through the test pen and the second connecting component, the power on the secondary cable is transmitted to the square wave signal module. At the same time, the square wave signal module also generates a square wave current signal on the secondary cable.

[0067] In one embodiment, the host further includes a first LCD display module 14 and a first voice prompt module 16, wherein:

[0068] When the first parameter is equal to the second parameter rate, the host controller U1 sends a correct match message to the first LCD display module 14 and the first voice prompt module 16 ; when the first parameter is not equal to the second parameter rate, the host controller U1 sends an incorrect match message to the first LCD display module 14 and the first voice prompt module 16 .

[0069] Specifically, when the first parameter is equal to the second parameter rate, the first LCD display module displays the words "match successful" and the first voice prompt module outputs the voice output of "match successful"; when the first parameter is not equal to the second parameter rate, the first LCD display module displays the words "match unsuccessful" and the first voice prompt module outputs the voice output of "match unsuccessful".

[0070] In one embodiment, Figure 3 As shown, the first LCD display module is a first display screen, and a first data input terminal of the first display screen is electrically connected to the host controller.

[0071] In one embodiment, the slave device further includes a second LCD display module 24 and a second voice prompt module 26, wherein:

[0072] The data input terminal of the second LCD display module 24 is electrically connected to the second data output terminal of the slave controller 22 ; the data input terminal of the second voice prompt module 26 is electrically connected to the third data output terminal of the slave controller 22 .

[0073] Specifically, the second LCD display module is a second display screen, a first data input terminal of the second display screen is electrically connected to the slave controller, and the second LCD display module is used to display the discharge current value detected by the current clamp meter.

[0074] In one embodiment, Figure 4 As shown, the lithium battery power supply module includes: a power input unit, a first power conversion unit U3, a charging management chip U4, a lithium battery BAT1 and a second power conversion module U5, wherein:

[0075] The output end of the power input unit is electrically connected to the input end of the first power conversion unit U3, and the output end of the first power conversion unit U3 is electrically connected to the enable end and the power input end of the charging management chip U4 respectively, the battery connection end of the charging management chip U4 is electrically connected to the positive end of the lithium battery BAT1 and the positive input end of the second power conversion module U5, the negative end of the lithium battery BAT1 is electrically connected to the negative input end of the second power conversion module U5, the output end of the second power conversion module U5 is electrically connected to the power input end of the host controller U1, and the input end of the power input unit is electrically connected to the DC power supply.

[0076] Specifically, the identification device is in dual power supply working mode, powered by an external 220V power adapter, and charges the built-in lithium battery at the same time, and has a battery charging protection circuit. When powered by the built-in lithium battery, the lithium battery can work continuously for more than 8 hours when fully charged.

[0077] It should be noted that both the host and the slave are equipped with lithium battery power supply modules, which provide power for other modules.

[0078] In one embodiment, a fuse overcurrent protection is also provided in the device, which automatically blows out in case of overcurrent, thereby effectively protecting the device from damage by overcurrent.

[0079] In one embodiment, Figure 5 As shown, the first communication module includes a wireless communication chip and an antenna, the first data input and output terminal of the wireless communication chip is electrically connected to the host controller, and the second data input and output terminal of the wireless communication chip is connected to the antenna.

[0080] In a specific embodiment, Figure 6 As shown, the cable identification device host is composed of a host controller U1, a square wave generating module 121, a square wave sampling module 122, a switching module 11, a first communication module 13, a first LCD display module 14, a first lithium battery power supply module 15, a first voice prompt module 16 and a plurality of buttons and indicator lights.

[0081] L11: Power light, always on after the power-on self-test is normal.

[0082] L12: Communication light, it will be on when the communication with the slave device is normal.

[0083] L13: Current detection light, it is always on when the detection current is DC, and flashes when the detection current is square wave, and the flashing frequency is the same as the square wave frequency.

[0084] L14: Identification light: After receiving the magnitude and frequency information of the detected square wave current sent by the slave, the host controller determines that it is consistent with the frequency of the square wave current detected by the host, and then it turns from off to bright.

[0085] K11: Power button, which is a self-locking button. Press it to turn on the machine and enter self-test. Press it again to shut down the machine.

[0086] K12: Square wave current frequency switching key, which is a self-locking button. When not pressed, the square wave current frequency is the default setting of 1Hz, and when pressed, the square wave current frequency is 2Hz.

[0087] K13: Reset button, which is a self-reset button. When pressed, it automatically clears the last test result and restarts the test and judgment.

[0088] In a specific embodiment, Figure 7 As shown, the cable identification device slave is composed of a slave controller 22, a DC clamp meter 21, a first communication module 23, a second LCD display module 24, a second lithium battery power supply module 25, a second voice prompt module 26, and a plurality of buttons and indicator lights.

[0089] L21: Power light, always on after the power-on self-test is normal.

[0090] L22: Communication light, it will be on when the communication with the host is normal.

[0091] L23: CT+ (DC clamp meter on the positive secondary cable) current detection light, which is always on when the detection current is DC and flashes when the detection current is a square wave. The flashing frequency is the same as the square wave frequency.

[0092] L24: CT- (DC clamp meter on the negative secondary cable) current detection light, which is always on when the detection current is DC and flashes when the detection current is a square wave. The flashing frequency is the same as the square wave frequency.

[0093] L25: Identification light. After receiving the size and frequency information of the square wave current detected by CT+ and CT-, the microcontroller determines that the size and frequency of the two square wave currents are consistent, and then it turns from off to bright.

[0094] K21: Power button, which is a self-locking button. Press it to turn on the machine and enter self-test. Press it again to shut down the machine.

[0095] K22: Reset button, which is a self-reset button. When pressed, it automatically clears the last test result and restarts the test and judgment.

[0096] The steps for using the secondary cable live identification device are as follows:

[0097] S1. Clamp the DC current clamp of the slave cable identification device onto the two power lines on the air switch side of the secondary cable DC feeder panel;

[0098] S2. Press the power button of the cable identification device slave, and the magnitude and frequency of the current flowing through the two cores will be displayed on its LCD screen;

[0099] S3. Insert the adapter module of the cable identification device host into the cable adapter terminal on the air switch side of the secondary cable protection device;

[0100] S4. Press the power button of the cable identification device host. After self-checking and finding no short circuit, a square wave current signal with a specific frequency will be generated. The frequency of the square wave current can be switched by pressing the button, and the size and frequency of the square wave current will be displayed on the LCD screen.

[0101] S5. The frequency of the current measured by the cable identification device slave is transmitted to the cable identification device host through wireless communication and displayed on the display screen of the identification device host.

[0102] S6. The host of the identification device will automatically compare the frequencies of the two currents. If the frequencies of the two currents are consistent, the cable between the host and the slave is the same cable, and the display screen will display "match correct", and a voice prompt "match correct" will be played and a buzzer will be emitted. If the frequencies of the two currents are inconsistent, it means that the cable between the host and the slave is not the same cable, and the display screen will display "match error", and a voice prompt "match error" will be played.

[0103] S7. Press the reset button on the identification device host to automatically clear the current test results and restart the test and judgment.

[0104] In a specific embodiment, Figure 8 and Fig. 9 As shown in the figure, KKa is the power switch of feeder branch 1, KKb is the power switch of feeder branch 2, CT11 and CT12 are clamp ammeters of the first slave of the identification device, CT21 and CT22 are clamp ammeters of the second slave of the identification device, ZJT is a switching module, KK1 is the power switch of device 1, and KK2 is the power switch of device 2.

[0105] There may be a positive and negative cross wiring error on the device side ( Figure 8 ), feeder side positive and negative poles cross wiring error ( Fig. 9 ), if such incorrect wiring is not detected during on-site work, it is easy to mistakenly remove the cable and cause abnormal events. The secondary cable identification device mentioned in the present invention can effectively identify such incorrect wiring to Figure 8 Taking the wiring method as an example, the specific identification steps are as follows:

[0106] S1, connect the host of the secondary cable identification device through the adapter module ZJT on the device side;

[0107] S2. Press the power button of the cable identification device. After self-checking and finding no short circuit, a square wave current signal with a specific frequency will be generated. The frequency of the square wave current can be switched by pressing the button.

[0108] S3, observing the magnitude and frequency of the current measured by the clamp ammeters CT11 and CT12 of the first slave of the cable identification device and the clamp ammeters CT21 and CT22 of the second slave of the cable identification device;

[0109] S4. If the square wave current of the same frequency is detected only in the clamp ammeters CT21 and CT22 of the second slave of the cable identification device, it means that there is no positive and negative cross wiring error in the system;

[0110] S5. If the clamp ammeters CT11 and CT12 of the first slave of the cable identification device and the clamp ammeters CT21 and CT22 of the second slave of the cable identification device simultaneously detect square wave currents of the same frequency, it indicates that the system has positive and negative poles crossed incorrectly wired.

[0111] In a specific embodiment, Fig.10 As shown in the figure, K1 is the power switch of feeder branch 1, K2 is the power switch of feeder branch 2, K3 is the closing point, CT11 and CT12 are the clamp ammeters of the slave of the first identification device, CT21 and CT22 are the clamp ammeters of the slave of the second identification device, ZJT is the switching module, KK1 is the power switch of device 1, KK2 is the power switch of device 2, and KK3 is the power switch of device 3;

[0112] exist Fig.10 In the wiring, in normal operation, switches K1, K2, and K3 cannot be in the closed position at the same time, that is, there are three operating modes: ① switches K1 and K2 are in the closed position, and K3 is in the open position; ② switches K1 and K3 are in the closed position, and K2 is in the open position; ③ switches K2 and K3 are in the closed position, and K1 is in the open position. If switches K1, K2, and K3 are in the closed position at the same time, the system is in the loop wiring mode, and it is necessary to accurately determine the number of power supply lines and find the closing point for decoupling.

[0113] Use the above secondary cable identification device to find the loop wiring. The specific steps of finding the loop wiring are as follows:

[0114] S1, connect to the host of the secondary cable identification device through the adapter module ZJT;

[0115] S2. Press the power button of the cable identification device. After self-checking and finding no short circuit, a square wave current signal with a specific frequency will be generated. The frequency of the square wave current can be switched by pressing the button.

[0116] S3, observing the magnitude and frequency of the current measured by the clamp ammeters CT11 and CT12 of the first slave of the cable identification device and the clamp ammeters CT21 and CT22 of the second slave of the cable identification device;

[0117] S4. If the square wave current of the same frequency is detected only in the clamp ammeters CT21 and CT22 of the second slave of the cable identification device, it means that there is no loop wiring in the system;

[0118] S5. If the square wave current of the same frequency is detected only in the clamp ammeter CT21 and CT22 of the second slave of the cable identification device, but the amplitude of the square wave current is smaller than the amplitude of the square wave current emitted by the host of the identification device, it means that there are other feeder branches in the system besides feeder branch 1 and feeder branch 2, and further search is required.

[0119] S5. If the clamp ammeters CT11 and CT12 of the first slave of the cable identification device and the clamp ammeters CT21 and CT22 of the second slave of the cable identification device simultaneously detect square wave currents of the same frequency, and the sum of the amplitudes of the square wave currents detected by the two slaves of the cable identification device is equal to the amplitude of the square wave current emitted by the host of the identification device, it means that there is a loop connection in the system, and it is necessary to further find the closing point K3 and then open the loop.

[0120] S6. If the clamp ammeters CT11 and CT12 of the first slave of the cable identification device and the clamp ammeters CT21 and CT22 of the second slave of the cable identification device simultaneously detect square wave currents of the same frequency, but the sum of the amplitudes of the square wave currents detected by the two slaves of the cable identification device is less than the amplitude of the square wave current emitted by the host of the identification device, it means that the system has loop wiring and there are other feeder branches besides feeder branch 1 and feeder branch 2, and further search is required.

[0121] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0122] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0123] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0124] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0125] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0126] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0127] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0128] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A device for identifying live secondary cables, characterized in that: The identification device includes a host and at least one slave wirelessly connected to the host, the host includes a switching module, a square wave signal module and a first communication module, and the slave includes a DC clamp meter, a second communication module and a slave controller, wherein: The plug-in end of the adapter module is electrically connected to the device connection end of the secondary cable to be tested, and the output end of the adapter module is electrically connected to the first input end of the square wave signal module; the DC clamp meter is set on the secondary cable to be tested at a position opposite to the device connection end, the output end of the DC clamp meter is electrically connected to the input end of the slave controller, the output end of the slave controller is electrically connected to the input end of the second communication module, the output end of the second communication module is wirelessly connected to the input end of the first communication module, and the output end of the first communication module is electrically connected to the second input end of the square wave signal module; The square wave signal module is used to generate a square wave signal at one end of the secondary cable to be tested, and collect a first parameter corresponding to the square wave signal. The DC clamp meter is used to collect a second parameter corresponding to the square wave signal at the other end of the secondary cable to be tested, and send the second parameter to the slave controller. The slave controller is used to send the second parameter to the first communication module through the second communication module. The first communication module is used to send the second parameter to the square wave signal module. The square wave signal module is used to compare the first parameter and the second parameter, and determine the identification result of the secondary cable to be tested according to the comparison result.

2. The device for identifying live secondary cables according to claim 1, characterized in that: The square wave signal module includes a square wave generating unit, a square wave collecting unit and a host controller, wherein: The signal output end of the host controller is electrically connected to the signal input end of the square wave generating unit, the output end of the square wave generating unit is electrically connected to the first input end of the square wave collecting unit, the output end of the square wave collecting unit is electrically connected to the first input end of the host controller, and the second input end of the host controller is electrically connected to the output end of the first communication module; the power input end of the square wave generating unit and the second input end of the square wave collecting unit are electrically connected to the output end of the adapter module respectively.

3. The device for identifying live secondary cables according to claim 2, characterized in that: The host further includes a lithium battery power supply module, the output end of the adapter module includes a positive output end and a negative output end, the signal output end of the host controller includes a first signal output end and a second signal output end, and the square wave generating unit includes a first resistor, a second resistor, a third resistor, a first photoelectric isolator and a second photoelectric isolator, wherein: The first signal output end of the host controller is electrically connected to the positive input end of the first photoelectric isolator, the negative input end of the first photoelectric isolator is electrically connected to the negative output end of the lithium battery power supply module, the first output end of the first photoelectric isolator is electrically connected to the positive output end of the adapter module and the first end of the first resistor, the second output end of the first photoelectric isolator is electrically connected to the second end of the first resistor and the second end of the second resistor, the second end of the second resistor is electrically connected to the first end of the third resistor and the first output end of the second photoelectric isolator, the second end of the third resistor is electrically connected to the second output end of the second photoelectric isolator and the first input end of the square wave collection unit, and the second input end of the square wave collection unit is electrically connected to the negative output end of the adapter module; the second signal output end of the host controller is electrically connected to the positive input end of the second photoelectric isolator, and the negative input end of the second photoelectric isolator is electrically connected to the negative output end of the lithium battery power supply module.

4. The device for identifying live secondary cables according to claim 2, characterized in that: The output end of the adapter module includes a positive output end and a negative output end, and the square wave acquisition unit includes a sampling resistor and an AD chip, wherein: The first end of the sampling resistor is electrically connected to the output end of the square wave generating unit and the first differential input end of the AD chip, respectively; the second end of the sampling resistor is electrically connected to the second differential input end of the AD chip and the negative output end of the adapter module, respectively; and the output end of the AD chip is electrically connected to the first input end of the host controller.

5. The device for identifying live secondary cables according to claim 3, characterized in that: The host further includes a security protection module, and the security protection module includes a fourth resistor, a fifth resistor and a sixth resistor, wherein: The fourth resistor, the fifth resistor and the sixth resistor are connected in series in sequence and in series between the positive output terminal and the negative output terminal of the adapter module, and the first end of the sixth resistor is electrically connected to the third differential input terminal of the AD chip, and the second end of the sixth resistor is electrically connected to the fourth differential input terminal of the AD chip.

6. The device for identifying live secondary cables according to claim 1, characterized in that: The DC clamp meter includes an output line and a first connecting component matching the output line, the output line is connected to a pluggable end of the first connecting component, and the output end of the first connecting component is electrically connected to the input end of the slave controller.

7. The device for identifying live secondary cables according to claim 1, characterized in that: The adapter module includes an adapter, a test lead and a second connecting component matching the test lead, the input end of the adapter is pluggable connected to the device connection end of the secondary cable to be tested, the output end of the adapter is pluggable connected to the input end of the test lead, the output end of the test lead is pluggable connected to the input end of the second connecting component, and the output end of the second connecting component is electrically connected to the first input end of the square wave signal module.

8. The device for identifying live secondary cables according to claim 2, characterized in that: The host also includes a first LCD display module and a first voice prompt module, wherein: When the first parameter is equal to the second parameter rate, the host controller sends correct matching information to the first LCD display module and the first voice prompt module; when the first parameter is not equal to the second parameter rate, the host controller sends incorrect matching information to the first LCD display module and the first voice prompt module.

9. The device for identifying live secondary cables according to claim 1, characterized in that: The slave device also includes a second LCD display module and a second voice prompt module, wherein: The data input end of the second LCD display module is electrically connected to the second data output end of the slave controller; the data input end of the second voice prompt module is electrically connected to the third data output end of the slave controller.

10. The device for identifying live secondary cables according to claim 2, characterized in that: The lithium battery power supply module includes: a power input unit, a first power conversion unit, a charging management chip, a lithium battery and a second power conversion module, wherein: The output end of the power input unit is electrically connected to the input end of the first power conversion unit, the output end of the first power conversion unit is electrically connected to the enable end and the power input end of the charging management chip respectively, the battery connection end of the charging management chip is electrically connected to the positive end of the lithium battery and the positive input end of the second power conversion module, the negative end of the lithium battery is electrically connected to the negative input end of the second power conversion module, the output end of the second power conversion module is electrically connected to the power input end of the power input end of the host controller, and the input end of the power input unit is electrically connected to a DC power supply.

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