Waste cable identification method based on digital voltage method

Abstract

The invention relates to a waste cable identification method based on a digital voltage method, and the method comprises the steps: enabling one end of a waste cable to be grounded, adding a voltage signal generator between the other end of the waste cable and the ground, enabling a digital voltage generator to form a loop with the ground through a cable, and transmitting a digital voltage signal Vt through the waste cable, the digital voltage Vt can be set as a binary voltage signal of 1-9 digits; meanwhile, the digital voltage detects a digital voltage signal, and when the collected binary digital voltage can be accurately translated into a corresponding number, it is proved that the detected cable is a waste cable injected with the signal, so that the accurate cable distinguishing effect is achieved; the method has the advantages that a digital voltage injection method is adopted, distinguishing is safe and accurate, and misjudgment caused by interference is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of identification marking of abandoned cables in transformer substations, and in particular relates to an abandoned cable identification method based on a digital voltage method. Background Art

[0002] The principle adopted by the existing abandoned cable inspection and marking equipment is the characteristic signal injection method, which uses a characteristic signal source to inject a signal into one end of the abandoned cable, and at the same time uses a current signal detector to detect the characteristic signal current to identify the cable, such as Figure 5 As shown, there are two existing ways of injecting signals: high-voltage pulse limiting and low-voltage AC signals: ① When using low-voltage AC signals, the signal current formed is small. Since this method requires abandoned cables and voltage sources to form a loop through the earth, there are various complex live cables and strong electric fields in the substation, which makes the abandoned cables extremely susceptible to electric field interference, which may lead to misjudgment or require the design of more complex anti-interference designs and algorithms; ② When using high-voltage pulse signal injection, the pulse signal reaches 400 or even thousands of volts, which makes the equipment high in power and energy consumption, and there is a large risk factor; therefore, it is very necessary to provide an abandoned cable identification method based on digital voltage method that uses digital voltage injection method, is safe and accurate in identification, and avoids misjudgment due to interference. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a method for identifying abandoned cables based on a digital voltage method, which adopts a digital voltage injection method, is safe and accurate in identification, and avoids misjudgment due to interference.

[0004] The object of the present invention is achieved by: a method for identifying abandoned cables based on a digital voltage method, the method comprising the following steps: Step 1: Ground one end of the discarded cable; Step 2: At the same time, a digital voltage generator is added between the other end of the discarded cable and the ground, and the digital voltage generator forms a loop with the ground through the cable; Step 3: The digital voltage generator transmits the digital voltage signal Vt through the discarded cable; Step 4: The digital voltage detector is inserted into the cable under test through the open-type transformer to detect the digital voltage signal; Step 5: When the collected binary digital voltage can be accurately translated into the corresponding digital, it is proved that the tested cable is a discarded cable injected with the signal, thereby achieving accurate cable identification effect; Step 6: The digital voltage detector displays the detected digital signal value and broadcasts the voice result.

[0005] The step 3 specifically includes the following steps: Step 3.1: The digital voltage generator inputs instructions to the CPU 1 through key input, sets the digital signal content, and is displayed by the display module 1; Step 3.2: CPU1 identifies the digital content and controls the wireless module 1 to send the data content to the digital voltage detector; Step 3.3: CPU1 controls the digital voltage generating circuit to generate an 80ms high-level start signal, and then outputs a digital voltage signal Vt.

[0006] The digital voltage signal Vt in step 3.3 is 8 4-bit binary voltage signal data which can be set to 1-9 numbers.

[0007] The step 4 specifically comprises the following steps: Step 4.1: CPU 2 of the digital voltage detector receives digital content through wireless module 2; Step 4.2: The measured induced voltage is amplified by the amplifier circuit and then uploaded to CPU2; Step 4.3: CPU2 identifies the 8 received digits. When the received digits correspond to the digital values ​​input by the signal generator, the tested cable is determined to be the target abandoned cable.

[0008] The step 6 is specifically as follows: the CPU 2 of the digital voltage detector controls the display module 2 to display the detected digital signal value, and broadcasts the voice result through the voice module.

[0009] A discarded cable identification system based on a digital voltage method adopts the discarded cable identification method based on the digital voltage method as described above to achieve accurate discarded cable detection effect. The system comprises: a digital voltage generator and a digital voltage detector. One end of the digital voltage generator is connected to the discarded cable and the other end is connected to the ground, so that the digital voltage generator forms a loop with the ground through the cable; the digital voltage detector is inserted into the tested cable through an open-type mutual inductor and uses an induction coil to detect the digital voltage signal.

[0010] The digital voltage generator includes: a display module 1, a CPU 1, a wireless module 1, a key circuit 1 and a signal generating circuit; the key module 1 transmits instructions to the CPU 1 to set the digital content of the input digital voltage, and sends it to the digital voltage detector through the wireless module 1, and displays the input content, communication effect, and human-computer interaction content through the display module 1.

[0011] After receiving the input instruction, the CPU sends a digital signal to the digital voltage generating circuit; the digital voltage generating circuit converts the digital signal of the CPU into a digital voltage signal and injects the digital voltage signal into the discarded cable.

[0012] The digital voltage detector includes: an induction coil, a wireless module 2, an amplifier circuit, a key circuit 2, a CPU 2, a display module 2 and a voice module; the amplifier circuit is used to amplify the induced voltage obtained by the induction coil; the CPU 2 is used to convert the amplified induced voltage into a digital voltage.

[0013] The display module 2 is used to display the decimal value of the detected digital signal; the voice module is used to voice broadcast the display data result of the current display module 2.

[0014] Beneficial effects of the present invention: The present invention is a method for identifying abandoned cables based on a digital voltage method. During use, the present invention adopts a digital voltage injection method to safely and accurately identify abandoned cables through digital voltage input and detection. Specifically, one end of the abandoned cable is grounded, and a voltage signal generator is added between the other end of the abandoned cable and the earth. The digital voltage generator forms a loop with the earth through the cable, and transmits a digital voltage signal Vt through the abandoned cable. The digital voltage Vt can be set to a binary voltage signal of 1-9 digits; at the same time, a digital voltage detector detects the digital voltage signal. When the collected binary digital voltage can be accurately translated into the corresponding digit, it proves that the tested cable is an abandoned cable with an injected signal, thereby achieving an accurate cable identification effect. The present invention has the advantages of adopting a digital voltage injection method, safe and accurate identification, and avoiding misjudgment due to interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the abandoned cable identification method based on the digital voltage method of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the digital voltage generator of the present invention.

[0017] Figure 3 Schematic diagram of a digital voltage generating circuit of the present invention.

[0018] Figure 4 It is a structural schematic diagram of the digital voltage detector of the present invention.

[0019] Figure 5 This is a schematic diagram of the traditional characteristic signal injection method of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. Example

[0021] like Figure 1-5 As shown, a method for identifying abandoned cables based on a digital voltage method comprises the following steps: Step 1: Ground one end of the discarded cable; Step 2: At the same time, a digital voltage generator is added between the other end of the discarded cable and the ground, and the digital voltage generator forms a loop with the ground through the cable; Step 3: The digital voltage generator transmits the digital voltage signal Vt through the discarded cable; Step 4: The digital voltage detector is inserted into the cable under test through the open-type transformer to detect the digital voltage signal; Step 5: When the collected binary digital voltage can be accurately translated into the corresponding digital, it is proved that the tested cable is a discarded cable injected with the signal, thereby achieving accurate cable identification effect; Step 6: The digital voltage detector displays the detected digital signal value and broadcasts the voice result.

[0022] The step 3 specifically includes the following steps: Step 3.1: The digital voltage generator inputs instructions to the CPU 1 through key input, sets the digital signal content, and is displayed by the display module 1; Step 3.2: CPU1 identifies the digital content and controls the wireless module 1 to send the data content to the digital voltage detector; Step 3.3: CPU1 controls the digital voltage generating circuit to generate an 80ms high-level start signal, and then outputs a digital voltage signal Vt.

[0023] The digital voltage signal Vt in step 3.3 is 8 4-bit binary voltage signal data which can be set to 1-9 numbers.

[0024] In this embodiment, the digital voltage signal generation process: the digital voltage generation circuit is designed as follows Figure 3 As shown, the left end of the circuit receives the digital signal of CPU1, and the right end is connected to the target discarded cable and the ground.

[0025] Before the digital voltage is output, CPU1 sends out a high level for 80ms, controls the relay to close for 80ms, and then sends out 8 digital signals. CPU1 converts each digit into a 4-bit binary number. Each digit is represented by 4 groups of 20ms long high and low levels, representing 0 and 1. For example, 80ms of low level is the number 0000, which is translated into decimal 0. For example, 60ms of low level and 20ms of high level are received, which is the number 0001, which is translated into decimal 1. This is until 8 complete digits are sent.

[0026] The step 4 specifically comprises the following steps: Step 4.1: CPU 2 of the digital voltage detector receives digital content through wireless module 2; Step 4.2: The measured induced voltage is amplified by the amplifier circuit and then uploaded to CPU2; Step 4.3: CPU2 identifies the 8 received digits. When the received digits correspond to the digital values ​​input by the signal generator, the tested cable is determined to be the target abandoned cable.

[0027] The step 6 is specifically as follows: the CPU 2 of the digital voltage detector controls the display module 2 to display the detected digital signal value, and broadcasts the voice result through the voice module.

[0028] In this embodiment, the present invention marks the cable by injecting a digital voltage, and the voltage formed by the digital voltage in the cable is very low, such as Figure 3 As shown, CPU1 drives S8550 and S8050 to further control the opening and closing of the relay. The output digital voltage range is 0-5V. The low voltage produces little interference and has high safety. Compared with the cable positioning device based on the high-voltage pulse principle, it has the advantage of safety.

[0029] The present invention can more accurately identify the target abandoned cable by comparing the injected digital voltage signal with the detected digital voltage signal, avoid misjudgment caused by on-site interference, and make the identification of abandoned cables more accurate and safe, without high voltage, and avoid accidents caused by misoperation of the running cable; compared with the cable locating device based on the low-voltage AC signal principle, it has the advantage of being more accurate, and the low-voltage AC signal is easily confused and misjudged with the AC electric field, induced voltage, harmonic voltage and other signals at the substation site.

[0030] The present invention is a method for identifying abandoned cables based on a digital voltage method. In use, the present invention adopts a digital voltage injection method to safely and accurately identify abandoned cables through digital voltage input and detection. Specifically, one end of the abandoned cable is grounded, and a voltage signal generator is added between the other end of the abandoned cable and the earth. The digital voltage generator forms a loop with the earth through the cable, and transmits a digital voltage signal Vt through the abandoned cable. The digital voltage Vt can be set to a binary voltage signal of 1-9 digits; at the same time, a digital voltage detector detects the digital voltage signal. When the collected binary digital voltage can be accurately translated into the corresponding digit, it is proved that the tested cable is an abandoned cable with an injected signal, thereby achieving an accurate cable identification effect. The present invention has the advantages of adopting a digital voltage injection method, safe and accurate identification, and avoiding misjudgment due to interference. Example

[0031] like Figure 1-5As shown, a discarded cable identification system based on a digital voltage method adopts the discarded cable identification method based on a digital voltage method as described above to achieve accurate discarded cable detection effect. The system includes: a digital voltage generator and a digital voltage detector. One end of the digital voltage generator is connected to the discarded cable and the other end is connected to the ground, so that the digital voltage generator forms a loop with the ground through the cable; the digital voltage detector is inserted into the cable under test through an open-type mutual inductor, and an induction coil is used to detect the digital voltage signal.

[0032] The digital voltage generator includes: a display module 1, a CPU 1, a wireless module 1, a key circuit 1 and a signal generating circuit; the key module 1 transmits instructions to the CPU 1 to set the digital content of the input digital voltage, and sends it to the digital voltage detector through the wireless module 1, and displays the input content, communication effect, and human-computer interaction content through the display module 1.

[0033] After receiving the input instruction, the CPU sends a digital signal to the digital voltage generating circuit; the digital voltage generating circuit converts the digital signal of the CPU into a digital voltage signal and injects the digital voltage signal into the discarded cable.

[0034] The digital voltage detector includes: an induction coil, a wireless module 2, an amplifier circuit, a key circuit 2, a CPU 2, a display module 2 and a voice module; the amplifier circuit is used to amplify the induced voltage obtained by the induction coil; the CPU 2 is used to convert the amplified induced voltage into a digital voltage.

[0035] The display module 2 is used to display the decimal value of the detected digital signal; the voice module is used to voice broadcast the display data result of the current display module 2.

[0036] In this embodiment, if Figure 4 As shown, the induction coil is designed as an open-type voltage transformer, which senses the cable voltage by inserting it into the cable. The obtained induced voltage is amplified by the amplifier circuit, and the CPU2 can convert the amplified induced voltage into a digital voltage.

[0037] The process of digital voltage detector detecting signals: the digital voltage detector is inserted into the cable under test through an open-type transformer to detect level changes. The measured induced voltage is amplified by the amplifier circuit and uploaded to CPU2; CPU2 identifies the way the received level changes: when the receiving level changes continuously for 80ms at a high level, the data receiving function is started, and a level is received every 20ms, and data is received in the form of high level as binary number 1 and low level as binary number 0, and every 4 binary bits are converted into 1 decimal number until 8 digits are received.

[0038] When the received digital value corresponds to the digital value input by the digital voltage generator, the cable under test is judged to be the target abandoned cable, and the detected digital value is displayed through the display module, and the voice result is broadcast through the voice module, thereby achieving accurate abandoned cable detection effect.

[0039] The present invention is a method for identifying abandoned cables based on a digital voltage method. In use, the present invention identifies abandoned cables by means of digital voltage injection and detection, so that the identification of abandoned cables is more accurate and safer. Specifically, one end of the abandoned cable is grounded, and a voltage signal generator is added between the other end of the abandoned cable and the earth. The digital voltage generator forms a loop with the earth through the cable, and transmits a digital voltage signal Vt through the abandoned cable. The digital voltage Vt can be set to a binary voltage signal of 1-9 digits; at the same time, a digital voltage detector detects the digital voltage signal. When the collected binary digital voltage can be accurately translated into the corresponding digit, it is proved that the tested cable is an abandoned cable with an injected signal, thereby achieving an accurate cable identification effect. The present invention has the advantages of adopting a digital voltage injection method, safe and accurate identification, and avoiding misjudgment due to interference.

Claims

1. A method for identifying abandoned cables based on a digital voltage method, characterized in that: The method comprises the following steps: Step 1: Ground one end of the discarded cable; Step 2: At the same time, a digital voltage generator is added between the other end of the discarded cable and the ground, and the digital voltage generator forms a loop with the ground through the cable; Step 3: The digital voltage generator transmits the digital voltage signal Vt through the discarded cable; Step 4: The digital voltage detector is inserted into the cable under test through the open-type transformer to detect the digital voltage signal; Step 5: When the collected binary digital voltage can be accurately translated into the corresponding digital, it is proved that the tested cable is a discarded cable injected with the signal, thereby achieving accurate cable identification effect; Step 6: The digital voltage detector displays the detected digital signal value and broadcasts the voice result.

2. The method for identifying abandoned cables based on digital voltage method according to claim 1, characterized in that: The step 3 specifically comprises the following steps: Step 3.1: The digital voltage generator inputs instructions to the CPU 1 through key input, sets the digital signal content, and is displayed by the display module 1; Step 3.2: CPU1 identifies the digital content and controls the wireless module 1 to send the data content to the digital voltage detector; Step 3.3: CPU1 controls the digital voltage generating circuit to generate an 80ms high-level start signal, and then outputs a digital voltage signal Vt.

3. The method for identifying abandoned cables based on digital voltage method according to claim 2, characterized in that: The digital voltage signal Vt in step 3.3 is 8 4-bit binary voltage signal data which can be set to 1-9 numbers.

4. The method for identifying abandoned cables based on digital voltage method according to claim 1, characterized in that: The step 4 specifically comprises the following steps: Step 4.1: CPU 2 of the digital voltage detector receives digital content through wireless module 2; Step 4.2: The measured induced voltage is amplified by the amplifier circuit and then uploaded to CPU2; Step 4.3: CPU2 identifies the 8 received digits. When the received digits correspond to the digital values ​​input by the signal generator, the tested cable is determined to be the target abandoned cable.

5. The method for identifying abandoned cables based on digital voltage method according to claim 1, characterized in that: The step 6 is specifically as follows: the CPU 2 of the digital voltage detector controls the display module 2 to display the detected digital signal value, and broadcasts the voice result through the voice module.

6. A discarded cable identification system based on a digital voltage method, which uses the discarded cable identification method based on a digital voltage method as described in any one of claims 1 to 5 to achieve accurate discarded cable detection effect, characterized in that: The system comprises: a digital voltage generator and a digital voltage detector. One end of the digital voltage generator is connected to the abandoned cable and the other end is connected to the ground, so that the digital voltage generator forms a loop with the ground through the cable; the digital voltage detector is inserted into the tested cable through an open-type mutual inductor and uses an induction coil to detect a digital voltage signal.

7. The waste cable identification system based on digital voltage method as claimed in claim 6, characterized in that: The digital voltage generator includes: a display module 1, a CPU 1, a wireless module 1, a key circuit 1 and a signal generating circuit; the key module 1 transmits instructions to the CPU 1 to set the digital content of the input digital voltage, and sends it to the digital voltage detector through the wireless module 1, and displays the input content, communication effect, and human-computer interaction content through the display module 1.

8. The waste cable identification system based on digital voltage method as claimed in claim 7, characterized in that: After receiving the input instruction, the CPU sends a digital signal to the digital voltage generating circuit; the digital voltage generating circuit converts the digital signal of the CPU into a digital voltage signal and injects the digital voltage signal into the discarded cable.

9. The waste cable identification system based on digital voltage method as claimed in claim 6, characterized in that: The digital voltage detector includes: an induction coil, a wireless module 2, an amplifier circuit, a key circuit 2, a CPU 2, a display module 2 and a voice module; the amplifier circuit is used to amplify the induced voltage obtained by the induction coil; the CPU 2 is used to convert the amplified induced voltage into a digital voltage.

10. The waste cable identification system based on digital voltage method as claimed in claim 9, characterized in that: The display module 2 is used to display the decimal value of the detected digital signal; the voice module is used to voice broadcast the display data result of the current display module 2.

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