Partial power failure line mutual inductance test system based on satellite pulse per second synchronization

Abstract

The utility model discloses an incomplete power failure line mutual inductance test system based on satellite pulse per second synchronization. The incomplete power failure line mutual inductance test system comprises a main control computer unit, three slave computer units, four handheld wireless terminals and a power supply unit, the main control computer unit and the power supply unit are mutually connected and are respectively connected to the head end of a power failure line; the handheld wireless terminals are in communication connection with one another, one handheld wireless terminal is connected with the main control computer unit, and the other three handheld wireless terminals are respectively and correspondingly connected with one slave computer unit; the slave units are externally connected with current sensors, and the three slave units are respectively connected to the tail end of a power failure line, the head end CT secondary side of an operation line and the tail end CT secondary side of the operation line. According to the invention, huge economic loss caused by whole-line power failure can be avoided, the measurement flexibility, safety and maintenance efficiency of the power system can be effectively improved, the risk of power grid operation is reduced, an important technical reference is provided for power grid construction and operation in other regions, and stable development of the national power system is promoted.

Description

Technical Field

[0001] This utility model relates to the field of power testing technology, specifically to a mutual inductance testing system for incomplete power outage lines based on satellite second pulse synchronization. Background Technology

[0002] Traditional methods for measuring mutual inductance parameters typically require a complete power outage of the line under test to ensure the safety and accuracy of the measurement. However, with the rapid development of power systems, especially in the measurement of mutual inductance parameters between newly built and existing lines, the complete power outage approach has gradually revealed many problems.

[0003] Currently, with the expansion of the power grid, line corridor resources are becoming increasingly scarce, and the number of double or multiple circuit lines operating in parallel is increasing year by year. This dense distribution of power lines increases the mutual inductance between lines, and accurately measuring these mutual inductance parameters is crucial for the safe and stable operation of the power grid. At the same time, the traditional method of requiring all lines to be de-energized simultaneously for mutual inductance testing faces numerous difficulties in practical operation.

[0004] First, complete power outages result in enormous economic losses, especially in load-intensive areas. Outages directly impact industrial production, residential electricity consumption, and commercial operations, causing widespread social and economic damage. For example, outages on critical transmission lines not only affect users' power supply but can also trigger a chain reaction, affecting the load balance of the entire power grid and potentially causing regional power shortages. In some critical areas, the economic losses from outages on double or multiple circuits are unbearable; the longer the outage, the greater the losses. Furthermore, the market competition faced by power supply companies and the increasing demands of users make minimizing outage time a crucial objective in power grid operation and maintenance.

[0005] Secondly, with the increasing number of double-circuit or multi-circuit lines mounted on the same tower, the measurement of mutual inductance becomes more complex, and power outage testing methods are often difficult to implement in such environments. To address line congestion and ensure the stable operation of the power grid, developing a technology for measuring mutual inductance parameters under uninterrupted power supply conditions has become an urgent technological breakthrough.

[0006] Therefore, in the current power system, developing mutual impedance measurement technology for double-circuit lines based on partial power outages is an important direction to address this challenge. Utility Model Content

[0007] To address the aforementioned issues, this invention provides a partial power outage line mutual inductance testing system based on satellite second pulse synchronization, effectively solving the problem that existing double-circuit transmission line mutual inductance parameter measurement technologies rely on a complete power outage of the line, resulting in significant economic losses and power supply interruption risks.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A partial power outage line mutual inductance testing system based on satellite second pulse synchronization includes one master control unit, three slave units, four handheld wireless terminals, and one power supply unit. The master control unit and the power supply unit are respectively connected to the beginning of the power outage line, and the master control unit is connected to the power supply unit. The handheld wireless terminals are interconnected, with one terminal connected to the master control unit and the other three terminals each connected to one slave unit. The slave units are connected to external current sensors, and the three slave units are respectively connected to the secondary side of the current transformer (CT) at the end of the power outage line, the beginning of the operating line, and the end of the operating line.

[0010] As a preferred embodiment of the above scheme, the main control unit includes a voltage acquisition module, a current acquisition module, a signal conditioning and amplification module, a GPS / BeiDou module, a Bluetooth module, a boost control module, a kernel processor module, and a display and interaction module. The voltage acquisition module is connected to the beginning of the power outage line, the voltage acquisition module and the current acquisition module are respectively connected to the signal conditioning and amplification module, and the signal conditioning and amplification module, the GPS / BeiDou module, the Bluetooth module, the boost control module, and the display and interaction module are respectively connected to the kernel processor module.

[0011] As a preferred embodiment of the above scheme, the slave unit includes a voltage acquisition module, a current acquisition module, a signal conditioning and amplification module, a GPS / BeiDou module, a Bluetooth module, a kernel processor module, and a display and interaction module. The voltage acquisition module and the current acquisition module are respectively connected to the signal conditioning and amplification module. The signal conditioning and amplification module, the GPS / BeiDou module, the Bluetooth module, and the display and interaction module are respectively connected to the kernel processor module. The current acquisition module is connected to an external current sensor and is connected to the secondary side of the CT at the end of the power outage line, the beginning of the operating line, or the end of the operating line. The voltage acquisition module is connected to the secondary side of the CT at the end of the power outage line, the beginning of the operating line, or the end of the operating line.

[0012] As a preferred embodiment of the above solution, the handheld wireless terminal includes a Bluetooth module, a 5G communication module, a kernel processor module, and a display interaction module. The Bluetooth module, the 5G communication module, and the display interaction module are respectively connected to the kernel processor module. Each handheld wireless terminal establishes communication with the other through the 5G communication module, and the handheld wireless terminal establishes communication with the master control unit and the slave unit through the Bluetooth module.

[0013] As a preferred embodiment of the above scheme, the power supply unit includes a frequency converter module, an isolation transformer module, and a power frequency suppression module connected in sequence. The frequency converter module is connected to the boost control module of the main control unit, and the power frequency suppression module is connected to the current acquisition module of the main control unit and the first end of the power outage line.

[0014] As a preferred embodiment of the above scheme, the boost control module includes a precision voltage adjustment circuit consisting of an optocoupler and a linearly variable digital potentiometer.

[0015] As a preferred embodiment of the above scheme, the voltage acquisition module adopts a high-precision voltage sensor; the current acquisition module adopts a high-precision Hall sensor; and the signal conditioning and amplification module includes a band-stop filter circuit, a voltage follower circuit composed of operational amplifier chips, and an amplification circuit.

[0016] As a preferred embodiment of the above scheme, the kernel processor module includes interconnected CPU chips, memory chips, operational amplifier chips, AD conversion chips, data buffers, and latches; the display interaction module includes interconnected liquid crystal displays and input buttons.

[0017] As a preferred embodiment of the above scheme, the variable frequency power supply module consists of a high-power variable frequency converter and a filter circuit; the power frequency suppression module uses a transformer to form a voltage suppression circuit and a high-power resistor to form a current suppression circuit.

[0018] As a preferred embodiment of the above scheme, the voltage sensor of the main control unit voltage acquisition module is connected to a high-voltage precision voltage divider resistor.

[0019] Due to the above structure, the beneficial effects of this utility model are as follows:

[0020] 1. Reduced economic losses by eliminating the need for a complete power outage. Existing technology requires a complete power outage for double-circuit lines, while this technology only requires a power outage on one circuit, allowing the other to operate normally. This improvement significantly reduces the economic losses caused by power outages, especially in critical lines and high-load areas, preventing large-scale power interruptions and minimizing the impact on industrial production, residential life, and commercial operations. Simultaneously, this method simplifies measurement procedures, making testing more efficient and saving time and labor costs.

[0021] 2. Employing a different frequency method avoids power frequency interference and improves measurement accuracy. Traditional power frequency measurement methods are easily affected by 50Hz power frequency signals, leading to significant measurement errors. This invention effectively avoids power frequency interference by using a 45Hz or 55Hz power supply for measurement, ensuring the accuracy of the measurement data. The use of the different frequency method not only improves measurement accuracy but also simplifies adaptability to complex power grid environments, reduces stringent requirements on field conditions, and makes the measurement more flexible and applicable.

[0022] 3. No impact on operating lines, ensuring grid stability. Existing testing methods require power outages or partial power outages on operating lines, posing certain risks. This invention collects differential frequency voltage and current signals on the secondary side of the operating lines, without affecting the normal power supply, ensuring grid stability and security. This improvement simplifies measurement operations, reduces potential operational risks, and enhances the feasibility and practicality of the technical solution.

[0023] 4. Precise synchronization ensures data timing consistency. Because transmission lines are typically long, traditional measurement methods face significant challenges in timing synchronization, especially with long lines, which can lead to data errors. This invention utilizes the second pulse signal from GPS / BeiDou satellites for time synchronization of each measurement unit, ensuring complete consistency in the start time of the test. This improvement allows for data consistency even during remote testing, unaffected by line length, thus greatly enhancing the accuracy of measurement results.

[0024] 5. 5G data transmission improves efficiency and automation. In existing technologies, data transmission mainly relies on manual methods or traditional communication methods, which are slow and susceptible to external interference. This invention uses a 5G network for data transmission, enabling data from each measurement unit to be transmitted to the main control unit in real time, achieving instant data aggregation and automated calculation. This improvement not only speeds up data processing and reduces manual intervention but also improves the accuracy and efficiency of data analysis, ensuring rapid acquisition of test results and enhancing the automation of the entire measurement process.

[0025] 6. The structure is simple, the test equipment is easy to operate, the test cost is low, and it can significantly improve the measurement efficiency and data accuracy. It effectively overcomes the shortcomings of existing technologies such as high power outage requirements, large power frequency interference, low synchronization accuracy and complex data processing. It is widely applicable to the measurement of mutual inductance parameters of double-circuit lines. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the main control unit structure of this utility model;

[0029] Figure 3 This is a schematic diagram of the slave unit structure of this utility model;

[0030] Figure 4 This is a schematic diagram of the handheld wireless terminal structure of this utility model;

[0031] Figure 5 This is a schematic diagram of the power supply unit structure of this utility model;

[0032] Figure 6 This is a schematic diagram of the signal conditioning circuit of the voltage acquisition module of this utility model;

[0033] Figure 7 This is a schematic diagram of the signal conditioning circuit of the current acquisition module of this utility model;

[0034] Figure 8 This is a schematic diagram of the voltage regulation circuit of the boost control module of this utility model;

[0035] Figure 9 This is a schematic diagram of the variable frequency power supply module circuit of this utility model. Detailed Implementation

[0036] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0037] like Figure 1 As shown, this embodiment provides a partial power outage line mutual inductance testing system based on satellite second pulse synchronization, including one master control unit, three slave units, four handheld wireless terminals, and one power supply unit. The master control unit and the power supply unit are respectively connected to the beginning of the power outage line, and the master control unit is connected to the power supply unit. The handheld wireless terminals are interconnected, with one connected to the master control unit and the other three connected to one slave unit respectively. Each slave unit is connected to an external current sensor, and the three slave units are respectively connected to the secondary side of the current transformer (CT) at the end of the power outage line, the beginning of the operating line, and the end of the operating line. Specifically:

[0038] like Figure 2 As shown, the main control unit includes a voltage acquisition module I1, a current acquisition module I2, a signal conditioning and amplification module I3, a GPS / BeiDou module I4, a Bluetooth module I5, a boost control module 6, a kernel processor module I7, and a display and interaction module I8. The voltage acquisition module I1 is connected to the beginning of the power outage line. The voltage acquisition module I1 and the current acquisition module I2 are respectively connected to the signal conditioning and amplification module I3. The signal conditioning and amplification module I3, the GPS / BeiDou module I4, the Bluetooth module I5, the boost control module 6, and the display and interaction module I8 are respectively connected to the kernel processor module I7. Wherein:

[0039] Voltage acquisition module I1: Employs high-voltage precision resistor divider;

[0040] Current acquisition module I2: Employs a high-precision Hall sensor;

[0041] Signal conditioning and amplification module I3: includes a band-stop filter circuit, a voltage follower circuit composed of operational amplifier chips, and an amplification circuit (such as...). Figure 6 , Figure 7 (as shown);

[0042] Boost control module 6: A precision voltage adjustment circuit consisting of an optocoupler and a linearly varying digital potentiometer (e.g., Figure 8 (as shown);

[0043] Kernel Processor Module I7: Includes CPU chips, memory chips, operational amplifier chips, AD conversion chips, data buffers, latches, etc., which are interconnected by lines;

[0044] Display Interaction Module I8: Consists of an LCD display and input buttons interconnected by wires.

[0045] To achieve synchronous testing of the voltage, current signal amplitude and phase of the master unit and slave unit, this embodiment uses the high-precision time signal of the Global Positioning System to receive and read the signal. At the agreed time, the synchronous signal acquisition of each unit begins. The falling edge signal of the PPS (Pulse Per Second) second pulse of the GPS system or Beidou system that is used to calibrate the set time is used as the test reference time.

[0046] like Figure 3 As shown, the slave unit includes a voltage acquisition module II9, a current acquisition module II10, a signal conditioning and amplification module II11, a GPS / BeiDou module II12, a Bluetooth module II13, a kernel processor module II14, and a display and interaction module II15. The voltage acquisition module II9 and current acquisition module II10 are respectively connected to the signal conditioning and amplification module II11. The signal conditioning and amplification module II11, GPS / BeiDou module II12, Bluetooth module II13, and display and interaction module II15 are respectively connected to the kernel processor module II14. The current acquisition module II10 is connected to an external current sensor, which is connected to the secondary side of the CT at the end of the power outage line, the beginning of the operating line, or the end of the operating line. The voltage acquisition module II9 is ​​connected to the secondary side of the CT at the end of the power outage line, the beginning of the operating line, or the end of the operating line. Wherein:

[0047] Voltage Acquisition Module II9: Employs a high-precision voltage sensor;

[0048] Current acquisition module II10: Employs a high-precision Hall sensor;

[0049] Signal Conditioning and Amplification Module II11: Includes a band-stop filter circuit, a voltage follower circuit composed of operational amplifier chips, and an amplifier circuit (such as...). Figure 6 , Figure 7 (as shown);

[0050] Kernel Processor Module II 14: Includes CPU chips, memory chips, operational amplifier chips, AD conversion chips, data buffers, latches, etc., which are interconnected by lines;

[0051] Display Interaction Module II15: Consists of an LCD display and input buttons interconnected by lines.

[0052] The three slave units are configured by their respective display and interaction modules according to their location on the line.

[0053] like Figure 4 As shown, the handheld wireless terminal includes a Bluetooth module III16, a 5G communication module 17, a kernel processor module III18, and a display interaction module III19. The Bluetooth module III16, 5G communication module 17, and display interaction module III19 are respectively connected to the kernel processor module III18. Communication between the handheld wireless terminals is established through the 5G communication module 17, and communication between the handheld wireless terminals and the master control unit and slave unit is established through the Bluetooth module III16. Wherein:

[0054] Kernel processor module Ⅲ18: includes CPU chips, memory chips, operational amplifier chips, AD conversion chips, data buffers, latches, etc., which are interconnected by lines;

[0055] Display Interaction Module Ⅲ19: Consists of an LCD display and input buttons interconnected by lines.

[0056] Each of the four handheld wireless terminals is configured via its own display and interaction module according to its location on the line.

[0057] like Figure 5 As shown, the power supply unit includes a frequency converter module 20, an isolation transformer module 21, and a power frequency suppression module 22 connected in sequence. The frequency converter module 20 is connected to the boost control module 6 of the main control unit, and the power frequency suppression module 22 is connected to the current acquisition module I2 of the main control unit and the beginning of the power outage line. Wherein:

[0058] Variable frequency power supply module 20: consists of a high-power frequency converter and a filter circuit (such as...) Figure 9 (as shown);

[0059] Power frequency suppression module 22: It uses a transformer to form a voltage suppression circuit and a high-power resistor to form a current suppression circuit.

[0060] The working principle of the above structure:

[0061] Taking the mutual impedance (mutual inductance) test of a double-circuit transmission line on the same tower as an example, the specific implementation of the system of this application is described in detail. In the double-circuit transmission line on the same tower, one line is de-energized and the other line is energized.

[0062] 1. Wiring and operation at the beginning of the power outage line

[0063] The main control unit, power supply unit, and No. 1 handheld wireless terminal are located at the beginning of the power outage line;

[0064] The main control unit's boost control module 6 is connected to the power supply unit via a dedicated signal line to control the power supply unit's output frequency and amplitude. The output of the internal frequency converter module 20 of the power supply unit is connected to the isolation transformer module 21. Due to the mutual inductance of the parallel energized lines, power frequency induced voltage and current will be generated on the power outage line. To suppress this power frequency interference signal, the output frequency signal of the isolation transformer module 21 also needs to pass through the power frequency suppression module 22. The preferred frequencies for the frequency signal are 45Hz and 55Hz. The main control unit's current acquisition module I2 is connected to the power supply unit via a dedicated signal line to acquire the current signal I1 output from the power supply unit to the power outage line. The main control unit's voltage acquisition module I1 is connected to the power outage line to acquire the voltage signal U1 at the beginning of the power outage line.

[0065] 1.1. Click "Start Test" on the No. 1 handheld wireless terminal. The Bluetooth module III16 of the No. 1 handheld wireless terminal communicates with the Bluetooth module I5 of the main control unit, controlling the main control unit to start the test.

[0066] 1.2.1 The 5G communication module 17 of handheld wireless terminal 1 establishes communication with the 5G communication modules 17 of handheld wireless terminals 2, 3, and 4, and controls handheld wireless terminals 2, 3, and 4 to start testing;

[0067] 1.3. The main control unit core processor module I7 reads the PPS second pulse signal from the built-in GPS / BeiDou module I4, starts to collect I1 and U1 signals at the set reference time point, and inputs the I1 and U1 signals to the signal conditioning and amplification module I3 for AD conversion. After that, the data is displayed on the display and interaction module I8 through the core processor module I7.

[0068] 1.4. The main control unit core processor module I7 simultaneously transmits the collected I1 and U1 signals to the No.1 handheld wireless terminal via the Bluetooth module I5, and displays the data on the No.1 handheld wireless terminal display interaction module III19.

[0069] 2. Wiring and operation at the end of the power outage line

[0070] Slave Unit 1 and Handheld Wireless Terminal 2 are located at the end of the power outage line.

[0071] The No. 1 slave unit current acquisition module II10 is connected to an external current sensor and connected to the end of the power outage line to acquire the abnormal frequency signal current I2 at the end of the power outage line; the voltage acquisition module II9 is ​​connected to the end of the power outage line to acquire the abnormal frequency signal voltage U2 at the end of the power outage line.

[0072] 2.1.2 The handheld wireless terminal receives the start test command from the handheld wireless terminal 1, establishes communication with the Bluetooth module II13 of the slave unit 1 through the Bluetooth module III16 of the handheld wireless terminal 2, and controls the slave unit 1 to start the test;

[0073] 2.2.1 The slave unit core processor module II14 reads the PPS second pulse signal from the GPS / BeiDou module II12, and starts to acquire I2 and U2 signals at the set reference time point; and inputs the I2 and U2 signals to the signal conditioning and amplification module II11 for AD conversion, and then displays the data on the display and interaction module II15 through the core processor module II14;

[0074] 2.3.1 The slave unit simultaneously transmits the collected I2 and U2 signals to the second handheld wireless terminal via Bluetooth module II13, and displays the data on the second handheld wireless terminal's display and interaction module II19.

[0075] 3. Wiring and operation at the beginning of the operating line

[0076] Slave Unit 2 and Handheld Wireless Terminal 3 are located at the beginning of the operating line.

[0077] The No. 2 slave unit current acquisition module II10 is connected to an external current sensor and connected to the secondary side of the CT at the beginning of the operating line to acquire the different frequency current signal I3 at the beginning of the operating line; the voltage acquisition module II9 is ​​connected to the secondary side of the PT at the beginning of the operating line to acquire the different frequency signal voltage U3 at the beginning of the operating line.

[0078] 3.1.3 Handheld wireless terminal receives the start test command from handheld wireless terminal 1, establishes communication with slave unit 2 Bluetooth module II13 through handheld wireless terminal 3 Bluetooth module Ⅲ16, and controls slave unit 2 to start the test;

[0079] 3.2.2 Slave unit reads the PPS second pulse signal from GPS / BeiDou module II12, and starts acquiring I3 and U3 signals at the set reference time point; then inputs the I3 and U3 signals to signal conditioning and amplification module II11 for AD conversion, and displays the data on display and interaction module II15 through kernel processor module II14;

[0080] Slave unit 3.3.2 simultaneously transmits the collected I3 and U3 signals to handheld wireless terminal 3 via Bluetooth module II13, and displays the data on the interactive display module II19 of handheld wireless terminal 3.

[0081] 4. Wiring and operation at the end of the operating line

[0082] Slave unit No. 3 and handheld wireless terminal No. 4 are located at the beginning of the operating line.

[0083] The No. 3 slave unit current acquisition module II10 is connected to an external current sensor and connected to the secondary side of the CT at the end of the operating line to acquire the different frequency current signal I4 at the end of the operating line; the voltage acquisition module II9 is ​​connected to the secondary side of the PT at the end of the operating line to acquire the different frequency signal voltage U4 at the end of the operating line.

[0084] 4.1.4 Handheld wireless terminal receives the start test command from handheld wireless terminal 1, establishes communication with slave unit 3 via Bluetooth module Ⅲ16 of handheld wireless terminal 4, and controls slave unit 3 to start the test;

[0085] 4.2.3 Slave unit reads the PPS second pulse signal from GPS / BeiDou module II12, and starts acquiring I4 and U4 signals at the set reference time point; then inputs the I4 and U4 signals to signal conditioning and amplification module II11 for AD conversion, and displays the data on display and interaction module II15 through kernel processor module II14;

[0086] 4.3.3 Slave unit 4 transmits the collected I4 and U4 signals to handheld wireless terminal 4 via Bluetooth module II13, and displays the data on the display and interaction module III19 of handheld wireless terminal 4.

[0087] 5. Data aggregation and calculation

[0088] 5.1. After the differential frequency voltage and current signals of the main control unit and slave units 1, 2, and 3 are uploaded to the corresponding handheld wireless terminals, the 5G communication module 17 of handheld wireless terminal 1 establishes a connection with the 5G communication modules 17 of handheld wireless terminals 2, 3, and 4. The handheld wireless terminals 2, 3, and 4 transmit the differential frequency voltage and current signals they read to handheld wireless terminal 1 through the 5G communication module 17 for data aggregation.

[0089] 5.2.1 The kernel processor module Ⅲ18 of the handheld wireless terminal reads the different frequency voltage and current signals returned by the handheld wireless terminals 2, 3 and 4, calculates them comprehensively, obtains the mutual impedance (mutual inductance) parameters between the de-energized line and the energized operating line, and displays the data on the display and interaction module Ⅲ19 of the handheld wireless terminal 1. At this point, the line mutual inductance test is completed.

[0090] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A system for testing the mutual inductance of a partially de-energized line based on satellite second-pulse synchronization, characterized in that it comprises: It includes one master unit, three slave units, four handheld wireless terminals and one power supply unit; the master unit and the power supply unit are respectively connected to the first end of the power-off line, and the master unit is connected to the power supply unit; the handheld wireless terminals are mutually connected in communication, and one of them is connected to the master unit, and the other three are respectively connected to one slave unit; the slave unit is externally connected to a current sensor, and three are respectively connected to the end of the power-off line, the CT secondary side of the first end of the running line and the CT secondary side of the end of the running line.

2. The system for testing the mutual inductance of the line without full power according to claim 1, characterized in that: The master unit includes a voltage acquisition module, a current acquisition module, a signal conditioning and amplification module, a GPS / Beidou module, a Bluetooth module, a boost control module, a kernel processor module and a display interaction module; the voltage acquisition module is connected to the first end of the power-off line, and the voltage acquisition module and the current acquisition module are respectively connected to the signal conditioning and amplification module; the signal conditioning and amplification module, the GPS / Beidou module, the Bluetooth module, the boost control module and the display interaction module are respectively connected to the kernel processor module.

3. The system for testing the mutual inductance of a non-de-energized line according to claim 1, characterized in that: The slave unit includes a voltage acquisition module, a current acquisition module, a signal conditioning and amplification module, a GPS / Beidou module, a Bluetooth module, a kernel processor module and a display interaction module; the voltage acquisition module and the current acquisition module are respectively connected to the signal conditioning and amplification module; the signal conditioning and amplification module, the GPS / Beidou module, the Bluetooth module and the display interaction module are respectively connected to the kernel processor module; the current acquisition module is externally connected to a current sensor and connected to the end of the power-off line, the CT secondary side of the first end of the running line or the CT secondary side of the end of the running line; the voltage acquisition module is connected to the end of the power-off line, the CT secondary side of the first end of the running line or the CT secondary side of the end of the running line.

4. The system for testing the mutual inductance of a non-de-energized line according to claim 1, characterized in that: The handheld wireless terminal includes a Bluetooth module, a 5G communication module, a kernel processor module and a display interaction module; the Bluetooth module, the 5G communication module and the display interaction module are respectively connected to the kernel processor module; the handheld wireless terminals are connected in communication through the 5G communication module, and the handheld wireless terminal and the master unit and the slave unit are connected in communication through the Bluetooth module.

5. The system for testing the mutual inductance of a non-de-energized line according to claim 1, characterized in that: The power supply unit includes a frequency conversion power supply module, an isolation transformer module and a power frequency suppression module connected in sequence; the frequency conversion power supply module is connected to the boost control module of the master unit; the power frequency suppression module is connected to the current acquisition module of the master unit and the first end of the power-off line.

6. The system for testing the mutual inductance of a non-de-energized line according to claim 2, characterized in that: The boost control module includes a precision voltage adjustment circuit composed of an optoelectronic coupler and a linear change digital potentiometer.

7. The system for testing the mutual inductance of a non-de-energized line according to claim 2 or 3, characterized in that: The voltage acquisition module uses a high-precision voltage sensor; the current acquisition module uses a high-precision Hall sensor; the signal conditioning and amplification module includes a band-stop filter circuit, a voltage follower circuit composed of an operational amplifier chip and an amplification circuit.

8. The system for testing the mutual inductance of a non-de-energized line according to any one of claims 2 to 4, characterized in that: The kernel processor module includes a CPU chip, a memory chip, an operational amplifier chip, an AD conversion chip, a data buffer and a latch connected to each other; the display interaction module includes a liquid crystal display and an input key connected to each other.

9. The system for testing the mutual inductance of a non-de-energized line according to claim 5, characterized in that: The variable frequency power supply module is composed of a high-power frequency converter and a filter circuit; the power frequency suppression module adopts a transformer to form a voltage suppression circuit and adopts a high-power resistor to form a current suppression circuit.

10. The system for testing the mutual inductance of a non-de-energized line according to claim 7, characterized in that: The voltage sensor of the voltage acquisition module of the main control unit is connected with a high-voltage precision voltage dividing resistor.

Images