A secondary cable core pair end rapid detection device based on conductor carrier communication

Abstract

The application discloses a kind of secondary cable core pair end fast detection device based on conductor carrier communication, it is related to electric power system detection field, including transmitting end and receiving end;The transmitting end includes carrier signal modulation module, first power supply, test interface one and first core control module, the first core control module is used to generate digital signal with unique identification information, the application is separated from design by using transmitting end and receiving end, and test chuck one and test chuck two are respectively clamped the two ends wire core of cable to be measured, transmitting end passes through carrier signal modulation module, with the unique identification information of digital signal generated by the first core control module, modulation is 120kHz-135kHz carrier signal and is loaded to wire core, receiving end is picked up signal after by test chuck two, by carrier signal demodulation module fast restores digital signal, second core control module automatically completes identification information verification, the whole process response time is short, improves detection efficiency, shortens operation time consumption.

Description

Technical Field

[0001] This invention belongs to the field of power system testing, specifically relating to a rapid testing device for the opposite end of a secondary cable core based on conductor carrier communication. Background Technology

[0002] In substation secondary systems, secondary cables are used to connect protection, monitoring, control, and operating equipment. They typically have 4 to 24 cores and can be laid over distances up to 10 kilometers. During new commissioning, maintenance, or troubleshooting, accurate core alignment is crucial to ensure correct circuit wiring and prevent malfunctions or failures to operate.

[0003] Traditional core-matching testing requires 2-4 maintenance personnel to work together at both ends of the cable, completing the core-matching through tedious operations such as short-circuiting and measuring one by one. The testing efficiency is low, and manual operation is prone to errors in core-matching due to negligence, which can lead to equipment malfunctions, signal interruptions, or even operational accidents.

[0004] Therefore, we propose a rapid detection device for the end of a secondary cable core based on conductor carrier communication to solve the above problems. Summary of the Invention

[0005] Traditional core-pairing testing requires 2-4 maintenance personnel to work together at both ends of the cable, performing tedious operations such as short-circuiting and measuring one by one to complete the core pairing. This results in low testing efficiency and the possibility of errors due to negligence during manual operation. Therefore, this invention provides a rapid core-pairing testing device for secondary cables based on conductor carrier communication.

[0006] The solution adopted by the present invention to solve its technical problem is: a rapid detection device for the end of a secondary cable core based on conductor carrier communication, comprising a transmitting end and a receiving end; The transmitting end includes a carrier signal modulation module, a first power supply, a test interface, and a first core control module. The first core control module is used to generate a digital signal with unique identification information. The carrier signal modulation module is connected to the first core control module and is used to modulate the digital signal into a carrier signal of a specific frequency, and load it onto the wire core at one end of the cable under test through test interface 1. The first power supply is electrically connected to the first core control module and the carrier signal modulation module, respectively; The receiving end includes a second core control module, a carrier signal demodulation module, a second power supply, a second test interface, and a detection feedback module; The second test interface is connected to the conductor at the other end of the cable under test. The carrier signal demodulation module is connected to the second test interface to pick up and restore the digital signal in the carrier signal. The second core control module is connected to the carrier signal demodulation module and is used to verify whether the restored unique identification information matches the currently paired transmitter. The detection feedback module is connected to the second core control module and outputs a recognition success signal when the recognition information is verified. The second power supply is electrically connected to the second core control module, the carrier signal demodulation module, and the detection feedback module, respectively.

[0007] Preferably, the unique identification information is generated using the AES-128 encryption algorithm, and the second core control module verifies the identification information using the same algorithm.

[0008] Preferably, the detection feedback module includes an LED indicator and a buzzer. When the recognition is successful, the LED stays on and the buzzer emits a continuous prompt sound of ≥60dB, with a response time of ≤500ms.

[0009] Preferably, both the first power source and the second power source are 7.4V / 5000mAh lithium batteries.

[0010] Preferably, both the transmitter and receiver are equipped with protective housings, which are made of engineering plastic.

[0011] Preferably, it also includes a first switch and a second switch. The first switch is disposed on the protective housing of the transmitting end and is used to control the first power supply to supply power to the first core control module and the carrier signal modulation module. The second switch is disposed on the protective housing of the receiving end and is used to control the first power supply to supply power to the second core control module, the carrier signal demodulation module and the detection feedback module.

[0012] Preferably, the protective housing is provided with a charging port for charging the first power source or the second power source.

[0013] Preferably, the frequency range of the carrier signal is 120 kHz to 135 kHz, suitable for transmission on secondary cable cores with a cross-sectional area of ​​0.5 mm² to 6 mm², and supports operation in unpressurized circuits and ≤500 V AC / DC circuits.

[0014] Preferably, the first test interface is a first test clamp, and the second test interface is a second test clamp. Both the first test clamp and the second test clamp are provided with soft copper probes for contacting the wire core.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs a separate transmitter and receiver design, with test clamp one and test clamp two clamping the two ends of the cable under test respectively. The transmitter modulates the digital signal with unique identification information generated by the first core control module into a 120kHz-135kHz carrier signal and loads it onto the cable core through the carrier signal modulation module. After the receiver picks up the signal through test clamp two, the carrier signal demodulation module quickly restores the digital signal. The second core control module automatically completes the identification information verification. The entire process has a short response time, improves detection efficiency, and shortens operation time.

[0016] 2. The unique identification information of this invention is generated by the AES-128 encryption algorithm, and the receiving end uses the same algorithm for verification to ensure detection accuracy and avoid human error.

[0017] 3. The detection feedback module of this invention integrates an LED indicator and a buzzer. When the recognition is successful, the LED is constantly lit and the buzzer emits a prompt sound of ≥60dB, providing intuitive feedback on the detection result without the need for repeated manual confirmation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a block diagram of the system modules of the present invention.

[0019] In the diagram: 1 Transmitter, 11 First switch, 12 Test clamp one, 2 Receiver, 21 LED light, 22 Buzzer, 23 Test clamp two. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figure 1-2 This invention provides a technical solution for a rapid detection device for the opposite end of a secondary cable core based on conductor carrier communication: Example 1: according to Figure 1 and Figure 2 As shown, it includes a separately configured transmitter 1 and receiver 2. Both transmitter 1 and receiver 2 are equipped with protective shells made of engineering plastic material, with a protection level of IP65. They can withstand a drop of 1.5 meters onto a cement ground without damage, and are effectively dustproof and waterproof, making them suitable for complex working scenarios such as cable trenches and outdoor environments.

[0022] The transmitter 1 includes a first core control module, a carrier signal modulation module, a first power supply, a test interface 1, and a first switch 11.

[0023] The first core control module uses the Arduino Nano V3.0 module, which operates at 5V, is equipped with 14 digital I / O pins and 8 analog input pins, has an operation speed of ≥16MHz, a storage capacity of ≥32KB, an operating current of ≤10mA, supports modular programming, and can stably generate digital signals with unique identification information. This unique identification information is generated through the AES-128 encryption algorithm to ensure data transmission security.

[0024] The carrier signal modulation module uses a KQ-130 carrier module, which is connected to the serial port of the first core control module. It is used to modulate the encrypted digital signal into a carrier signal with a frequency range of 120kHz to 135kHz. This frequency band has strong transmission stability on secondary cable cores with a cross-sectional area of ​​0.5mm² to 6mm², with a transmission success rate of ≥99.5% within 3 kilometers and out-of-band rejection of ≥60dB. The device is only suitable for secondary cable circuits that have been confirmed to have no dangerous voltage.

[0025] The first power supply uses a 7.4V / 5000mAh lithium battery pack, equipped with a 3S1P charging protection board, which has overcharge, over-discharge and short circuit protection functions, and a single charge provides a battery life of ≥8.6 hours. It also supports 5V / 2A fast charging.

[0026] Test interface one is test clamp one 12, which is equipped with soft copper probes with a contact resistance of ≤0.1Ω to ensure good contact with the wire core and durability.

[0027] The first switch 11 is installed on the protective shell of the transmitter 1 and is used to control the first power supply to supply power to the first core control module and the carrier signal modulation module. The protective shell is also provided with a TYPE-C charging port for charging the first power supply.

[0028] The receiver 2 includes a second core control module, a carrier signal demodulation module, a second power supply, a second test interface, a detection feedback module, and a second switch.

[0029] The second core control module also uses the Arduino Nano V3.0 module, with the same parameters as the first core control module. It uses the same AES-128 encryption algorithm to verify the unique identification information in the digital signal restored by the carrier signal demodulation module. The core identification delay is ≤80ms and the communication success rate is ≥99.5%.

[0030] The carrier signal demodulation module uses the KQ-130 carrier module that is matched with the carrier signal modulation module. It is connected to test interface two to pick up the carrier signal on the core of the cable under test and restore it to a digital signal before transmitting it to the second core control module. By optimizing the communication protocol and adding CRC check code and signal retransmission mechanism, the success rate of continuously transmitting 10,000 frames of data can still reach 99.58% in an electromagnetic interference environment of 50dBμV / m.

[0031] The second power source has the same specifications as the first power source, which is a 7.4V / 5000mAh lithium battery pack. It has the same charging protection function and battery life, and the protective shell has a corresponding charging port.

[0032] Test interface two is test clamp two 23, which has the same structure as test clamp one 12 and is also equipped with soft copper probes to ensure reliable contact with the wire core at the other end of the cable under test.

[0033] The detection feedback module includes an LED indicator 21 and a buzzer 22. The LED indicator 21 is used to provide feedback on the recognition result through its on / off state. The volume of the buzzer 22 is ≥60dB. When the second core control module verifies that the recognition information is successful, the LED indicator 21 is constantly lit, and the buzzer 22 emits a continuous prompt sound with a response time ≤500ms. When the verification is successful, the LED indicator 21 is turned off, and the buzzer 22 does not emit any sound.

[0034] The second switch is installed on the protective housing of the receiver 2 and is used to control the second power supply to supply power to the second core control module, the carrier signal demodulation module and the detection feedback module.

[0035] The specific operating steps of the rapid detection device for the paired ends of the secondary cable cores in this embodiment are as follows: Work preparation: One maintenance personnel shall arrive at the work site with transmitter 1 and receiver 2, confirm that the secondary cable to be tested has been de-energized, tested for voltage and tagged, and that there is no dangerous voltage in the wire core. The cable to be tested has 24 cores, a laying distance of 2.5 kilometers, a wire core cross-sectional area of ​​1.5 mm², and is in a passive secondary circuit. Device startup: Turn on the power supply of the transmitter by the first switch 11 of the transmitter 1, turn on the power supply of the receiver by the second switch of the receiver 2, and wait for the device initialization to complete. Wiring operation: Clamp the test clip 12 of the transmitter 1 onto any one of the wire cores at one end of the cable under test using a soft copper probe, and clamp the test clip 23 of the receiver 2 onto the wire core to be checked at the other end of the cable under test, ensuring good contact between the probe and the wire core. Signal transmission and verification: The first core control module of transmitter 1 generates a digital signal with AES-128 encrypted identification information. After being modulated into a 125kHz carrier signal by the carrier signal modulation module, it is loaded onto the wire core under test through test clamp 12. The carrier signal demodulation module of receiver 2 picks up the carrier signal through test clamp 23, restores the digital signal and transmits it to the second core control module. The second core control module uses the same AES-128 algorithm to verify whether the identification information matches. Feedback: If the identification information is verified, the LED indicator 21 of receiver 2 will immediately light up continuously, and the buzzer 22 will emit a continuous 65dB beep, indicating that the two wire cores currently clamped are the opposite ends. If the verification fails, LED indicator 21 will remain off and buzzer 22 will not sound. The clamping wire core of the receiver needs to be replaced and the test repeated. Batch testing: Following the steps above, complete the end-to-end verification of all cores in the 21-core cable to be tested.

[0036] This invention employs a separate transmitter and receiver design, with test clamp one and test clamp two clamping the two ends of the cable under test respectively. The transmitter modulates the digital signal with unique identification information generated by the first core control module into a 120kHz-135kHz carrier signal and loads it onto the cable core through a carrier signal modulation module. The receiver picks up the signal through test clamp two, and the carrier signal demodulation module quickly restores the digital signal. The second core control module automatically completes the identification information verification. The entire process has a short response time, improves detection efficiency, and shortens operation time.

Claims

1. A rapid detection device for the paired ends of a secondary cable core based on conductor carrier communication, characterized in that: Includes the transmitter and receiver; The transmitting end includes a carrier signal modulation module, a first power supply, a test interface, and a first core control module. The first core control module is used to generate a digital signal with unique identification information. The carrier signal modulation module is connected to the first core control module and is used to modulate the digital signal into a carrier signal of a specific frequency, and load it onto the wire core at one end of the cable under test through test interface 1. The first power supply is electrically connected to the first core control module and the carrier signal modulation module, respectively; The receiving end includes a second core control module, a carrier signal demodulation module, a second power supply, a second test interface, and a detection feedback module; The second test interface is connected to the conductor at the other end of the cable under test. The carrier signal demodulation module is connected to the second test interface to pick up and restore the digital signal in the carrier signal. The second core control module is connected to the carrier signal demodulation module and is used to verify whether the restored unique identification information matches the currently paired transmitter. The detection feedback module is connected to the second core control module and outputs a recognition success signal when the recognition information is verified. The second power supply is electrically connected to the second core control module, the carrier signal demodulation module, and the detection feedback module, respectively.

2. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 1, characterized in that: The unique identification information is generated using the AES-128 encryption algorithm, and the second core control module verifies the identification information using the same algorithm.

3. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 1, characterized in that: The detection feedback module includes an LED indicator and a buzzer. When the recognition is successful, the LED stays on and the buzzer emits a continuous prompt sound.

4. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 1, characterized in that: Both the first power source and the second power source are lithium batteries.

5. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 4, characterized in that: Both the transmitter and receiver are equipped with protective housings.

6. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 5, characterized in that: It also includes a first switch and a second switch. The first switch is disposed on the protective housing of the transmitting end and is used to control the first power supply to supply power to the first core control module and the carrier signal modulation module. The second switch is disposed on the protective housing of the receiving end and is used to control the first power supply to supply power to the second core control module, the carrier signal demodulation module and the detection feedback module.

7. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 5, characterized in that: The protective housing is provided with a charging port for charging the first power source or the second power source.

8. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 1, characterized in that: The frequency range of the carrier signal is 120 kHz to 135 kHz.

9. The rapid detection device for the paired end of a secondary cable core based on conductor carrier communication according to claim 1, characterized in that: The first test interface is the first test clamp, and the second test interface is the second test clamp. Both the first and second test clamps are equipped with soft copper probes for contacting the wire core.

Images