A discharge current measurement device, system and method for the process of entering and exiting the equipotential in live working on transmission lines

Abstract

The present invention discloses a discharge current measuring device for the process of entering and exiting the equipotential in live working on transmission lines. The shielding housing includes a shielding barrel, a first grading ring, and a second grading ring; the grading ring includes a funnel-shaped housing and a hollow ring; the shielding barrel is divided into an equipment chamber and a resistance chamber by a partition; the measuring resistance includes a first end and a second end; the first electrode is disposed at the narrow end of the funnel-shaped housing of the first grading ring; the second electrode is clamped in a hollow insulating plug and connected to the second end of the measuring resistance; the measuring device is disposed in the equipment chamber and connected to the first end and the second end of the measuring resistance; the first electrode is used to receive the discharge current generated by the breakdown of the gap and introduce it into the shielding housing; the measuring resistance is used to receive the discharge current from the shielding housing and introduce it into the second electrode. A discharge current measuring system for the process of entering and exiting the equipotential in live working on transmission lines is also disclosed. A discharge current measuring method for the process of entering and exiting the equipotential in live working on transmission lines is also disclosed.

Description

Technical Field

[0001] The present invention relates to the field of high-voltage discharge current measurement systems, and particularly to a discharge current measurement device, system and method for the process of entering and exiting the equipotential during live working on transmission lines. Background Art

[0002] Under the requirements of the sustainable development of China's economy and society and the large-scale development of digital infrastructure construction, the construction of the power system has been continuously strengthened, the scale of the power grid has been gradually expanded, and power users have put forward higher requirements for the safety and reliability of power supply. As an important part of the power grid, transmission lines often fail due to factors such as meteorological conditions, natural disasters and their own aging.

[0003] Live working, as an important technical means for the live maintenance and defect elimination of transmission lines, can effectively ensure the uninterrupted, safe and reliable power supply of transmission lines. In recent years, with the continuous development and improvement of China's live working technology, its application scenarios have become more and more extensive, and the workload has also increased day by day. Live working personnel work in an environment with a relatively large electric field intensity, and there are certain safety risks during the operation process. Therefore, it is very important to ensure the safety of live working. Therefore, carrying out relevant tests and theoretical research to clarify the safety risks existing in the live working process is of great significance for improving the safety of live working, enhancing the reliability of power supply of China's power grid, and ensuring the stability of digital construction and economic development. When live working personnel enter and exit the equipotential wearing shielding clothing, the conductor-tower gap is divided into two sub-gaps: conductor-worker and worker-tower, forming a live working combined gap, and the workers will affect the discharge characteristics and discharge development characteristics of the gap. In recent years, Chinese scholars have carried out a large number of tests on the discharge characteristics and discharge observation tests of live working combined gaps, and initially revealed the discharge characteristics and development process of the gaps. However, at present, there is a lack of means to measure the surface discharge current of personnel during the process of personnel entering and exiting the equipotential, and it is difficult to further clarify the discharge process of the live working combined gap and the influence mechanism of the personnel on the discharge characteristics and discharge development characteristics of the long air gap.

[0004] Therefore, there is an urgent need for a new technical solution to solve the technical problem of how to simulate and measure the surface discharge current of personnel during the process of personnel entering and exiting the equipotential. Summary of the Invention

[0005] The present invention provides a discharge current measurement device, system and method for the process of entering and exiting the equipotential during live working on transmission lines, so as to solve the technical problem of how to simulate and measure the surface discharge current of personnel during the process of personnel entering and exiting the equipotential.

[0006] To achieve the above object, the present invention provides a discharge current measuring device for the process of entering and exiting the equipotential of live working on transmission lines, which is characterized by comprising a shielding housing, a measuring resistor, a first electrode, a second electrode and a measuring device;

[0007] The shielding housing includes a shielding barrel, a first grading ring and a second grading ring; the shielding barrel is an aluminum cylinder with two open ends of a preset thickness, and an aluminum partition is provided at a preset depth inside the shielding barrel. The partition divides the shielding barrel into an independent equipment chamber and a resistor chamber up and down; a first small hole is provided on the partition; both the first grading ring and the second grading ring include a funnel-shaped housing of a preset thickness and a hollow ring; the wide-mouth end of the funnel-shaped housing is welded to the inner side of the hollow ring; the first grading ring is hermetically connected to the open end of the equipment chamber, and the second grading ring is hermetically connected to the open end of the resistor chamber; a hollow insulating plug for isolating the electrode from the second grading ring is provided at the narrow-mouth end of the funnel-shaped housing of the second grading ring;

[0008] The measuring resistor includes a first end and a second end, and is connected to the resistor chamber side of the partition through the first end; the measuring resistor includes a high-voltage non-inductive resistor with a power greater than a preset value;

[0009] Both the first electrode and the second electrode are made of stainless steel; the first electrode is provided at the narrow-mouth end of the funnel-shaped housing of the first grading ring; the second electrode is clamped in the hollow insulating plug and connected to the second end of the measuring resistor;

[0010] The measuring device is provided on the equipment chamber side of the partition, and is connected to the first end and the second end of the measuring resistor respectively through two high-voltage measuring terminals passing through the first small hole, for collecting the voltage data of the measuring resistor;

[0011] The first electrode is used to receive the discharge current generated by the breakdown of the gap and introduce the discharge current into the shielding housing; the measuring resistor is used to receive the discharge current from the shielding housing and introduce the discharge current into the second electrode.

[0012] Preferably, the measuring device includes a metal box, a first oscilloscope, a first data transmitter and a power supply; the first oscilloscope, the first data transmitter and the power supply are all arranged inside the metal box; a second small hole is provided on the funnel-shaped housing of the first grading ring;

[0013] The first oscilloscope is connected to a high-voltage passive probe, and the high-voltage passive probe is connected to two high-voltage measuring terminals; the first oscilloscope is also connected to the first data transmitter; the first data transmitter is connected to an external device through an optical fiber passing through the second small hole;

[0014] The first data transmitter is used to receive a trigger signal from an external device and send the trigger signal to the first oscilloscope; the trigger signal is used to control the first oscilloscope to collect the voltage data of the measuring resistor and send the voltage data to the first data transmitter; the first data transmitter is also used to return the voltage data to the external device.

[0015] Preferably, the first data transmitter is also used for the conversion between optical signals and electrical signals, including:

[0016] After receiving a trigger signal from an external device, the first data transmitter is also used to convert the trigger signal from the optical signal form to the electrical signal form, and then send the trigger signal in the electrical signal form to the first oscilloscope;

[0017] After receiving the voltage data sent by the first oscilloscope, the first data transmitter is also used to convert the voltage data from the electrical signal form to the optical signal form, and then send the voltage data in the optical signal form to the external device.

[0018] Preferably, the measuring resistor includes a first copper plate, a second copper plate and a preset number of high-voltage non-inductive resistors;

[0019] One ends of the preset number of high-voltage non-inductive resistors are all connected to the first copper plate, and the other ends are all connected to the second copper plate; the first copper plate is the first end of the measuring resistor, and the second copper plate is the second end of the measuring resistor;

[0020] A thin copper rod is provided on each of the first copper plate and the second copper plate, and the thin copper rod is used to connect the high-voltage measuring terminal; thin copper gaskets for stabilizing the electrical connection relationship are provided between the high-voltage non-inductive resistor and the first copper plate and the second copper plate.

[0021] Preferably, both the first electrode and the second electrode include a mounting end and a hemispherical end with a convex point in the center. The first electrode is detachably mounted on the narrow end of the funnel-shaped outer shell of the first grading ring through the mounting end; the second electrode is detachably mounted on the hollow insulating plug of the second grading ring through the mounting end.

[0022] Preferably, the first grading ring is hermetically connected to the open end of the equipment chamber, and the second grading ring is hermetically connected to the open end of the resistor chamber, including:

[0023] The hermetic connection between the first grading ring and the open end of the equipment chamber includes a detachable and sealable connection;

[0024] The hermetic connection between the second grading ring and the open end of the resistor chamber includes a detachable and sealable connection;

[0025] The detachable and sealable connection is used to disassemble the grading ring and maintain the components or equipment in the shielding barrel, and is also used to seal the connection between the first grading ring and the second grading ring and the shielding barrel.

[0026] Preferably, a hanging component for hanging the shielding barrel is provided on the outer wall of the shielding barrel; the hanging component includes a preset number of lifting rings, and the preset number of lifting rings are evenly arranged on the outer wall of the shielding barrel at the same horizontal height.

[0027] The present invention also provides a discharge current measurement system for the process of entering and exiting the equipotential during live working on transmission lines, including the device of the present invention, a ground potential measurement device, an impulse voltage generator, and a voltage divider; the ground potential measurement device includes a second oscilloscope, a second data transmitter, and a power supply;

[0028] The impulse voltage generator is connected to a high-voltage electrode for generating an impulse voltage; the impulse voltage generator is connected to the high-voltage end of the voltage divider; the second oscilloscope is connected to the low-voltage end of the voltage divider for measuring the waveform of the breakdown voltage; the second oscilloscope is also connected to the second data transmitter;

[0029] The second oscilloscope is used to automatically start working when the voltage applied by the impulse voltage generator reaches the preset trigger level of the second oscilloscope, and send a trigger signal to the second data transmitter;

[0030] The second data transmitter is used to receive the trigger signal sent by the second oscilloscope and send the trigger signal to the first data transmitter; the second data transmitter is also used to receive the voltage data returned by the first data transmitter and send the voltage data to the host computer.

[0031] Preferably, the first data transmitter is also used for the conversion between optical signals and electrical signals and the conversion between optical signals and digital signals, including:

[0032] The second data transmitter is also used to convert the trigger signal from the electrical signal form to the optical signal form after receiving the trigger signal sent by the second oscilloscope, and then send the trigger signal in the optical signal form to the first data transmitter;

[0033] The second data transmitter is also used to convert the voltage data from the optical signal form to the digital signal form after receiving the voltage data sent by the first data transmitter, and then send the voltage data in the digital signal form to the host computer.

[0034] The present invention also provides a discharge current measurement method for the process of entering and exiting the equipotential during live working on transmission lines. Based on the system of the present invention, the method includes the following steps:

[0035] S1. Arrange the system. Among them, use an insulating rope and an insulating bracket to suspend the device in the gap to be measured through a suspension assembly; arrange the ground potential measurement device at a position far from the gap to be measured;

[0036] S2. Open the data analysis software of the first oscilloscope and the second oscilloscope in the host computer, open the ports of the corresponding probes, and adjust the voltage display magnification and waveform width parameters; control the impulse voltage generator to apply a voltage. When the voltage rises to the preset trigger level of the second oscilloscope, the second oscilloscope starts to record the applied voltage waveform before and after the trigger moment and sends a trigger signal to the second data transmitter;

[0037] S3. The second data transmitter receives the trigger signal and sends the trigger signal to the first data transmitter;

[0038] S4. The first data transmitter receives the trigger signal and sends the trigger signal to the first oscilloscope;

[0039] S5. The first oscilloscope collects the voltage data of the measured resistor according to the trigger signal and sends the voltage data to the first data transmitter;

[0040] S6. The first data transmitter receives the voltage data and sends the voltage data to the second data transmitter;

[0041] S7. The second data transmitter receives the voltage data and sends the voltage data to the host computer.

[0042] The present invention has the following beneficial effects:

[0043] The discharge current measuring device for the process of entering and exiting the equipotential of live working on transmission lines of the present invention, due to the Faraday cage structure with surface equipotential formed by the shielding shell, enables the shielding shell of the present invention to shield the strong electric field generated during the discharge process, reducing the influence of the electric field on the normal operation of the internal equipment of the discharge current measuring device and the signal transmission between devices. By the first grading ring and the second grading ring, the curvature radius at the edge of the shielding barrel mouth is increased, reducing the non-uniformly distributed spatial electric field on the surface of the device, thereby achieving the purpose of uniform voltage on the entire shielding shell surface and avoiding corona due to excessive field strength at the edge of the shielding barrel. The second electrode is separated from the shielding shell by the hollow insulating plug, enabling the device to avoid discharge in this gap. The device of the present invention guides the discharge current to flow from the first electrode to the second electrode, enabling the device of the present invention to measure the discharge current data of the floating potential, that is, the discharge current measurement during the process of entering and exiting the equipotential of live working on transmission lines can be realized through the device of the present invention.

[0044] The discharge current measuring system for the process of entering and exiting the equipotential of live working on transmission lines of the present invention, based on the device of the present invention, has the same beneficial effects as the device of the present invention.

[0045] The discharge current measuring method for the process of entering and exiting the equipotential of live working on transmission lines of the present invention, based on the system of the present invention, has the same beneficial effects as the system of the present invention.

[0046] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. Description of the Drawings

[0047] The accompanying drawings, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0048] Figure 1 is a sectional view of the device of the first preferred embodiment of the present invention.

[0049] Figure 2 is a front view of the device of the first preferred embodiment of the present invention.

[0050] Figure 3 is a schematic diagram of the system of the second preferred embodiment of the present invention.

[0051] In the drawings:

[0052] 100, shielding housing; 110, shielding barrel; 111, partition; 112, equipment room; 113, resistor room; 114, lifting ring; 120, first grading ring; 121, funnel-shaped housing; 122, hollow ring; 123, second small hole; 130, second grading ring; 131, hollow insulating plug; 200, measuring resistor; 210, first end; 220, second end; 230, first copper plate; 240, second copper plate; 250, high-voltage non-inductive resistor; 260, thin copper rod; 300, first electrode; 400, second electrode; 500, impulse voltage generator; 600, voltage divider; 700, second data transmitter; 800, second oscilloscope; 900, host computer. Detailed Embodiment

[0053] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0054] Embodiment 1:

[0055] Referring to Figures 1 to 2 , in the preferred embodiment of the present invention, a discharge current measuring device for the process of entering and exiting the equipotential of live working on transmission lines is provided, which is characterized by including a shielding housing 100, a measuring resistor 200, a first electrode 300, a second electrode 400 and measuring equipment.

[0056] In the preferred embodiment of the present invention, the shielding housing 100 includes a shielding barrel 110, a first grading ring 120 and a second grading ring 130, and the shielding housing forms a Faraday cage structure with surface equipotential.

[0057] In the preferred embodiment of the present invention, since the shielding housing 100 forms a Faraday cage structure with surface equipotential, the shielding housing 100 of the present invention can shield the strong electric field generated during the discharge process and reduce the influence of the electric field on the normal operation of the internal equipment of the discharge current measuring device and the signal transmission between the equipment.

[0058] The shielding barrel 110 is an aluminum cylinder with open ends and a preset thickness. In a preferred embodiment of the present invention, the thickness of the shielding barrel 110 is preferably 5 mm.

[0059] An aluminum partition 111 is provided at a preset depth inside the shielding barrel 110. The partition 111 divides the shielding barrel 110 vertically into an independent equipment chamber 112 and a resistor chamber 113; the partition 111 is provided with a first small hole; both the first equalizing ring 120 and the second equalizing ring 130 include a funnel-shaped outer shell 121 with a preset thickness and a hollow ring 122. In a preferred embodiment of the present invention, the thickness of the first equalizing ring 120 and the second equalizing ring 130 is preferably 3 mm.

[0060] The wide-mouth end of the funnel-shaped outer shell 121 is welded to the inner side of the hollow ring 122; the first equalizing ring 120 is hermetically connected to the open end of the equipment chamber 112, and the second equalizing ring 130 is hermetically connected to the open end of the resistor chamber 113; a hollow insulating plug 131 for insulating the electrode from the second equalizing ring 130 is provided at the narrow-mouth end of the funnel-shaped outer shell 121 of the second equalizing ring 130.

[0061] In a preferred embodiment of the present invention, the first equalizing ring 120 is hermetically connected to the open end of the equipment chamber 112, and the second equalizing ring 130 is hermetically connected to the open end of the resistor chamber 113, which includes:

[0062] The hermetic connection between the first equalizing ring 120 and the open end of the equipment chamber 112 includes a detachable and hermetic connection; the hermetic connection between the second equalizing ring 130 and the open end of the resistor chamber 113 includes a detachable and hermetic connection. The detachable and hermetic connection is used to disassemble the equalizing ring and maintain the components or equipment inside the shielding barrel 110, and is also used to seal the connection between the first equalizing ring 120 and the second equalizing ring 130 and the shielding barrel 110.

[0063] In a preferred embodiment of the present invention, connection components are provided at the open ends of both ends of the shielding barrel and the funnel-shaped outer shell of the equalizing ring. The open ends of both ends of the shielding barrel are the open end of the equipment chamber 112 and the open end of the resistor chamber 113; the open ends of both ends of the shielding barrel 110 and the funnel-shaped outer shell 121 are detachably and hermetically connected through the connection components; the connection components include a thin aluminum sheet with holes, and the thin aluminum sheet with holes at the open ends of both ends of the shielding barrel 110 and the funnel-shaped outer shell 121 is connected by a pin to form a hermetic connection.

[0064] In a preferred embodiment of the present invention, the first equalizing ring 120 and the second equalizing ring 130 increase the radius of curvature at the edge of the barrel mouth of the shielding barrel 110, reduce the non-uniformly distributed space electric field on the surface of the device, thereby achieving the purpose of uniform voltage on the surface of the entire shielding shell 100, and avoiding corona due to excessive edge field strength of the shielding barrel 110.

[0065] In a preferred embodiment of the present invention, a hanging assembly for hanging the shielding barrel 110 is provided on the outer wall of the shielding barrel 110; the hanging assembly includes a preset number of lifting rings 114, and the preset number of lifting rings 114 are evenly arranged on the outer wall of the shielding barrel 110 at the same horizontal height.

[0066] In a preferred embodiment of the present invention, the device can be hung in the gap to be measured through the lifting ring 114, which is convenient for arranging the test scene.

[0067] In a preferred embodiment of the present invention, the measuring resistor 200 includes a first end 210 and a second end 220, and is connected to the side of the resistor chamber 113 of the partition 111 through the first end 210; the measuring resistor 200 includes a high-voltage non-inductive resistor 250 with a power greater than a preset value.

[0068] The measuring resistor 200 includes a first copper plate 230, a second copper plate 240 and a preset number of high-voltage non-inductive resistors 250.

[0069] One end of the preset number of high-voltage non-inductive resistors 250 is connected to the first copper plate 230, and the other end is connected to the second copper plate 240; the first copper plate 230 is the first end 210 of the measuring resistor 200, and the second copper plate 240 is the second end 220 of the measuring resistor 200.

[0070] A thin copper rod 260 is provided on both the first copper plate 230 and the second copper plate 240, and the thin copper rod 260 is used to connect the high-voltage measurement terminal; a thin copper gasket for stabilizing the electrical connection relationship is provided between the high-voltage non-inductive resistor 250 and the first copper plate 230 and the second copper plate 240.

[0071] In a preferred embodiment of the present invention, the first copper plate 230 is circular, which is convenient for the high-voltage measurement terminal to pass through and connect to the second copper plate 240; the second copper plate 240 is cross-shaped, which is convenient for a screwdriver to extend into the shielding barrel 110 to disassemble the equipment inside the shielding barrel 110 during equipment maintenance.

[0072] In a preferred embodiment of the present invention, the measuring resistor 200 is resistant to high voltage, resistant to pulses, and has almost no inductance, that is, the inductance value is less than 50 nH.

[0073] In a preferred embodiment of the present invention, the measuring resistor 200 is composed of a preset number of high-voltage non-inductive resistors 250 connected in parallel. After parallel connection, the total power is greater than 800 W, and the resistance value is 1 to 20 ohms.

[0074] In a preferred embodiment of the present invention, both ends of the high-voltage non-inductive resistor 250 are provided with screw holes, which is convenient for installation.

[0075] In a preferred embodiment of the present invention, preferably, the model of the high-voltage non-inductive resistor 250 is RI80.

[0076] In a preferred embodiment of the present invention, both the first electrode 300 and the second electrode 400 are made of stainless steel; the first electrode 300 is disposed at the narrow end of the funnel-shaped outer shell 121 of the first grading ring 120; the second electrode 400 is clamped in the hollow insulating plug 131 and connected to the second end 220 of the measuring resistor 200;

[0077] Both the first electrode 300 and the second electrode 400 include a mounting end and a hemispherical end with a convex point in the center. The first electrode 300 is detachably mounted at the narrow end of the funnel-shaped outer shell 121 of the first grading ring 120 through the mounting end; the second electrode 400 is detachably mounted on the hollow insulating plug 131 of the second grading ring 130 through the mounting end. The hollow insulating plug 131 is made of epoxy resin.

[0078] In a preferred embodiment of the present invention, the hemispherical end with a convex point in the center of the electrode can reduce stray current, make the measurement data more accurate, and the discharge behavior is obvious enough to facilitate the measurement of data.

[0079] In a preferred embodiment of the present invention, since there is a potential difference between the second electrode 400 and the shielding outer shell 100, the hollow insulating plug 131 separating the two can prevent discharge in this gap.

[0080] In a preferred embodiment of the present invention, the measuring device is disposed on the side of the equipment chamber 112 of the partition 111 and is respectively connected to the first end 210 and the second end 220 of the measuring resistor 200 through two high-voltage measuring terminals after passing through the first small hole, for collecting the voltage data of the measuring resistor 200; when the discharge current flows through the measuring resistor 200, the discharge current data can be obtained by collecting the voltage across the measuring resistor 200.

[0081] The measuring device includes a metal box, a first oscilloscope, a first data transmitter, and a power supply; the first oscilloscope, the first data transmitter, and the power supply are all disposed inside the metal box, which is convenient for debugging and installation and can ensure good heat dissipation; a second small hole 123 is provided on the funnel-shaped outer shell 121 of the first grading ring 120; the power supply of the measuring device is used to supply power to the measuring device.

[0082] In a preferred embodiment of the present invention, preferably, the model of the first oscilloscope is Keysight U2702A, which has a bandwidth of 200 MHz and a sampling frequency of 1 GSa / s.

[0083] The first oscilloscope is connected to a high-voltage passive probe, and the high-voltage passive probe is connected to two high-voltage measuring terminals;

[0084] In a preferred embodiment of the present invention, preferably, the model of the high-voltage passive probe is Keysight 10076C, which has a bandwidth of 500 MHz, an attenuation ratio of 100:1, and a maximum tolerable input voltage peak-to-peak value of 4000 V.

[0085] The first oscilloscope is also connected to a first data transmitter; the first data transmitter is connected to an external device through an optical fiber passing through a second small hole 123;

[0086] The first data transmitter is configured to receive a trigger signal from the external device and send the trigger signal to the first oscilloscope; the trigger signal is used to control the first oscilloscope to collect voltage data of the measuring resistor 200 and send the voltage data to the first data transmitter; the first data transmitter is also used to return the voltage data to the external device.

[0087] In a preferred embodiment of the present invention, the first data transmitter is further configured for the conversion between optical signals and electrical signals, including:

[0088] The first data transmitter is further configured to, after receiving the trigger signal from the external device, convert the trigger signal from the optical signal form into the electrical signal form, and then send the trigger signal in the electrical signal form to the first oscilloscope;

[0089] The first data transmitter is further configured to, after receiving the voltage data sent by the first oscilloscope, convert the voltage data from the electrical signal form into the optical signal form, and then send the voltage data in the optical signal form to the external device.

[0090] In a preferred embodiment of the present invention, the first electrode 300 is configured to receive the discharge current generated by the breakdown of the gap and introduce the discharge current into the shielding housing 100; the measuring resistor 200 is configured to receive the discharge current from the shielding housing 100 and introduce the discharge current into the second electrode 400.

[0091] For the discharge current measuring device used in the process of entering and exiting the equipotential of live working on transmission lines of the present invention, since the shielding housing forms a Faraday cage structure with surface equipotential, the shielding housing of the present invention can shield the strong electric field generated during the discharge process and reduce the influence of the electric field on the normal operation of the internal devices of the discharge current measuring device and the signal transmission between devices. By the first grading ring and the second grading ring, the radius of curvature at the edge of the shielding barrel mouth is increased, and the non-uniformly distributed space electric field on the surface of the device is reduced, so as to achieve the purpose of uniform voltage on the entire surface of the shielding housing and avoid corona due to excessive field strength at the edge of the shielding barrel. By separating the second electrode from the shielding housing through the hollow insulating plug, this device can avoid discharge in this gap. By guiding the discharge current from the first electrode to the second electrode through the device of the present invention, the device of the present invention can measure the discharge current data of the floating potential, that is, the discharge current measurement during the process of entering and exiting the equipotential of live working on transmission lines can be realized through the device of the present invention.

[0092] Embodiment 2:

[0093] See Figure 3, in a preferred embodiment of the present invention, there is also provided a discharge current measurement system for the process of entering and exiting the equipotential during live working on transmission lines, including the device of the present invention, a ground potential measurement device, an impulse voltage generator 500, and a voltage divider 600; the ground potential measurement device includes a second oscilloscope 800, a second data transmitter 700, and a power supply;

[0094] The impulse voltage generator 500 is connected to a high-voltage electrode (either the high-voltage electrode in the simulated scenario or the high-voltage electrode in the actual scenario), and is used to generate an impulse voltage; the impulse voltage generator 500 is connected to the high-voltage end of the voltage divider 600; the second oscilloscope 800 is connected to the low-voltage end of the voltage divider 600 and is used to measure the waveform of the breakdown voltage; the second oscilloscope 800 is also connected to the second data transmitter 700; the power supply of the system is used to supply power to some devices within the system.

[0095] In Figure 3 , H represents the high-voltage electrode, E represents the insulating bracket for the suspension device, and F represents the insulating rope for the suspension device.

[0096] The second oscilloscope 800 automatically enters the Single mode during each discharge test; the second oscilloscope 800 is used to automatically start working when the voltage applied by the impulse voltage generator 500 reaches the preset trigger level of the second oscilloscope 800, and send a trigger signal to the second data transmitter 700;

[0097] The second data transmitter 700 is used to receive the trigger signal sent by the second oscilloscope 800 and send the trigger signal to the first data transmitter; the second data transmitter 700 is also used to receive the voltage data returned by the first data transmitter and send the voltage data to the host computer 900.

[0098] In a preferred embodiment of the present invention, the first data transmitter is also used for the conversion between optical signals and electrical signals and the conversion between optical signals and digital signals, including:

[0099] The second data transmitter 700 is also used to convert the trigger signal from the electrical signal form to the optical signal form after receiving the trigger signal sent by the second oscilloscope 800, and then send the trigger signal in the optical signal form to the first data transmitter;

[0100] The second data transmitter 700 is also used to convert the voltage data from the optical signal form to the digital signal form after receiving the voltage data sent by the first data transmitter, and then send the voltage data in the digital signal form to the host computer 900.

[0101] In a preferred embodiment of the present invention, the first oscilloscope includes at least a first RF connector, a second RF connector, a USB interface, and a power supply interface. The first data transmitter includes at least a single-mode single-core optical fiber interface, a multi-mode duplex optical fiber interface, a USB port, an RF connector, and a power supply interface. The second data transmitter 700 includes at least a single-mode single-core optical fiber interface, a multi-mode duplex optical fiber interface, a Type B interface, an RF connector, and a power supply interface. The second oscilloscope 800 includes at least a first RF connector, a second RF connector, a USB interface, and a power supply interface, wherein the first RF connector of the second oscilloscope is an AUX OUT port.

[0102] The first RF connector of the first oscilloscope is connected to a high-voltage probe for monitoring the voltage data of the measuring resistor 200. The second RF connector of the first oscilloscope is connected to the RF connector of the first data transmitter through an RF connection line for transmitting electrical signals. The USB interface of the first oscilloscope is connected to the USB interface of the first data transmitter through a USB data line. The single-core optical fiber interfaces and the multi-mode duplex optical fiber interfaces of the first data transmitter and the second data transmitter 700 are connected correspondingly through optical fibers. Trigger signals are transmitted between the single-core optical fiber interfaces, and data information is transmitted between the multi-mode duplex optical fiber interfaces.

[0103] The Type B interface of the second data transmitter 700 is connected to the USB interface of the host computer 900. The RF connector of the second data transmitter 700 is connected to the AUX OUT port of the second oscilloscope 800 through an RF connection line with a shielding layer.

[0104] The second oscilloscope 800 is connected to the host computer 900 through a USB interface and is connected to the low-voltage end of the voltage divider 600 through the second RF connector.

[0105] In a preferred embodiment of the present invention, the second oscilloscope 800 is powered by a regulated power supply provided by the test site, while the host computer 900 and the second data transmitter 700 are powered by a mobile power supply, avoiding the influence of voltage instability caused by electromagnetic interference during the discharge process of a long air gap with a suspended conductor on the normal operation of the equipment.

[0106] The discharge current measurement system for the process of entering and exiting the equipotential during live working on transmission lines of the present invention, based on the device of the present invention, has the same beneficial effects as the device of the present invention.

[0107] Embodiment 3:

[0108] In a preferred embodiment of the present invention, a method for measuring the discharge current during the process of entering and exiting the equipotential during live working on transmission lines is also provided, based on the system of the present invention;

[0109] In a preferred embodiment of the present invention, refer to Figure 3, the system of the present invention is combined with a simulated rod - plate gap for discharge current testing, and the method includes the following steps:

[0110] S1. Arrange the system. Specifically, use an insulating rope and an insulating bracket to suspend the device in the gap to be measured through a suspension assembly; arrange the ground - potential measuring device at a position far from the gap to be measured.

[0111] S2. Open the data - analysis software of the first oscilloscope and the second oscilloscope 800 in the upper computer 900, open the ports of the corresponding probes, and adjust the voltage display magnification and waveform width parameters; control the impulse voltage generator 500 to apply voltage. When the voltage rises to the preset trigger level of the second oscilloscope 800, the second oscilloscope 800 starts to record the applied voltage waveforms before and after the trigger moment and sends a trigger signal to the second data transmitter 700.

[0112] S3. The second data transmitter 700 receives the trigger signal and sends the trigger signal to the first data transmitter.

[0113] S4. The first data transmitter receives the trigger signal and sends the trigger signal to the first oscilloscope.

[0114] S5. The first oscilloscope collects the voltage data of the measuring resistor 200 according to the trigger signal and sends the voltage data to the first data transmitter.

[0115] S6. The first data transmitter receives the voltage data and sends the voltage data to the second data transmitter 700.

[0116] S7. The second data transmitter 700 receives the voltage data and sends the voltage data to the upper computer 900.

[0117] In the preferred embodiment of the present invention, the electric field in the rod - plate gap is an extremely non - uniform electric field, and this electric field is extremely prone to discharge, that is, the most dangerous situation. Using the test data under the rod - plate gap to guide live working can effectively ensure the safety of the operation.

[0118] The method for measuring the discharge current during the process of entering and exiting the equal - potential of live working on transmission lines of the present invention, based on the system of the present invention, has the same beneficial effects as the system of the present invention.

[0119] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A discharge current measuring device for the process of entering and exiting the equipotential during live working on transmission lines, characterized in that, It includes a shielding housing (100), a measuring resistor (200), a first electrode (300), a second electrode (400) and a measuring device; The shielding housing (100) includes a shielding barrel (110), a first grading ring (120) and a second grading ring (130); the shielding barrel (110) is an aluminum cylinder with two open ends of a preset thickness, and an aluminum partition (111) is provided at a preset depth inside the shielding barrel (110), and the partition (111) divides the shielding barrel (110) into an independent device chamber (112) and a resistor chamber (113) up and down; a first small hole is provided on the partition (111); both the first grading ring (120) and the second grading ring (130) include a funnel-shaped housing (121) and a hollow ring (122) of a preset thickness; the wide-mouth end of the funnel-shaped housing (121) is welded to the inner side of the hollow ring (122); the first grading ring (120) is hermetically connected to the open end of the device chamber (112), and the second grading ring (130) is hermetically connected to the open end of the resistor chamber (113); a hollow insulating plug (131) for insulating the electrode from the second grading ring (130) is provided at the narrow-mouth end of the funnel-shaped housing (121) of the second grading ring (130); The measuring resistor (200) includes a first end (210) and a second end (220), and is connected to the resistor chamber (113) side of the partition (111) through the first end (210); the measuring resistor (200) includes a high-voltage non-inductive resistor (250) with a power greater than a preset value; Both the first electrode (300) and the second electrode (400) are made of stainless steel; the first electrode (300) is provided at the narrow-mouth end of the funnel-shaped housing (121) of the first grading ring (120); the second electrode (400) is clamped in the hollow insulating plug (131) and connected to the second end (220) of the measuring resistor (200); The measuring device is provided on the device chamber (112) side of the partition (111), and is connected to the first end (210) and the second end (220) of the measuring resistor (200) respectively through two high-voltage measuring terminals after passing through the first small hole, for collecting voltage data of the measuring resistor (200); The first electrode (300) is used to receive the discharge current generated by the breakdown of the gap and introduce the discharge current into the shielding housing (100); the measuring resistor (200) is used to receive the discharge current from the shielding housing (100) and introduce the discharge current into the second electrode (400).

2. The discharge current measuring device for live working on transmission lines during the process of entering and exiting the equipotential, according to claim 1, wherein The measuring device includes a metal box, a first oscilloscope, a first data transmitter and a power supply; the first oscilloscope, the first data transmitter and the power supply are all provided inside the metal box; a second small hole (123) is provided on the funnel-shaped housing (121) of the first grading ring (120); The first oscilloscope is connected to a high-voltage passive probe, and the high-voltage passive probe is connected to the two high-voltage measurement terminals; the first oscilloscope is also connected to the first data transmitter; the first data transmitter is connected to an external device through an optical fiber passing through the second small hole (123); The first data transmitter is configured to receive a trigger signal from the external device and send the trigger signal to the first oscilloscope; the trigger signal is used to control the first oscilloscope to collect voltage data of the measurement resistor (200) and send the voltage data to the first data transmitter; the first data transmitter is also used to return the voltage data to the external device.

3. The discharge current measuring device for live working on transmission lines during the process of entering and exiting the equipotential, according to claim 2, is characterized in that The first data transmitter is also used for the conversion between optical signals and electrical signals, including: After receiving the trigger signal from the external device, the first data transmitter is configured to convert the trigger signal from the optical signal form to the electrical signal form and then send the trigger signal in the electrical signal form to the first oscilloscope; After receiving the voltage data sent by the first oscilloscope, the first data transmitter is configured to convert the voltage data from the electrical signal form to the optical signal form and then send the voltage data in the optical signal form to the external device.

4. The discharge current measuring device for the process of entering and exiting the equipotential during live working on transmission lines according to claim 3, wherein The measurement resistor (200) includes a first copper plate (230), a second copper plate (240), and a preset number of high-voltage non-inductive resistors (250); One ends of the preset number of high-voltage non-inductive resistors (250) are all connected to the first copper plate (230), and the other ends are all connected to the second copper plate (240); the first copper plate (230) is the first end (210) of the measurement resistor (200), and the second copper plate (240) is the second end (220) of the measurement resistor (200); A thin copper rod (260) is provided on each of the first copper plate (230) and the second copper plate (240), and the thin copper rod (260) is used to connect the high-voltage measurement terminals; thin copper gaskets for stabilizing the electrical connection relationship are provided between the high-voltage non-inductive resistor (250) and the first copper plate (230) and the second copper plate (240).

5. The discharge current measuring device for the process of entering and exiting the equipotential during live working on transmission lines according to claim 4, characterized in that, Both the first electrode (300) and the second electrode (400) include a mounting end and a hemispherical end with a convex point in the center. The first electrode (300) is detachably mounted on the narrow end of the funnel-shaped housing (121) of the first grading ring (120) through the mounting end; the second electrode (400) is detachably mounted on the hollow insulating plug (131) of the second grading ring (130) through the mounting end.

6. The discharge current measuring device for live working on transmission lines during the process of entering and exiting the equipotential, according to claim 5, is characterized in that, The first grading ring (120) is hermetically connected to the open end of the equipment chamber (112), and the second grading ring (130) is hermetically connected to the open end of the resistor chamber (113), including: The hermetic connection between the first grading ring (120) and the open end of the equipment chamber (112) includes a detachable and hermetic connection; The hermetic connection between the second grading ring (130) and the open end of the resistor chamber (113) includes a detachable and hermetic connection; The detachable and sealable connection is used to disassemble the grading ring and maintain the components or devices inside the shielding barrel (110), and is also used to seal the connection between the first grading ring (120) and the second grading ring (130) and the shielding barrel (110).

7. The discharge current measuring device for the process of entering and exiting the equipotential during live working on transmission lines according to claim 6, characterized in that A hanging assembly for hanging the shielding barrel (110) is provided on the outer wall of the shielding barrel (110); the hanging assembly includes a preset number of lifting rings (114), and the preset number of lifting rings (114) are evenly arranged on the outer wall of the shielding barrel (110) at the same horizontal height.

8. A discharge current measurement system for the process of entering and exiting the equipotential during live working on transmission lines, characterized in that, Comprising the device according to any one of claims 2 to 7, a ground potential measuring device, an impulse voltage generator (500) and a voltage divider (600); the ground potential measuring device includes a second oscilloscope (800), a second data transmitter (700) and a power supply. The impulse voltage generator (500) is connected to a high-voltage electrode for generating an impulse voltage; the impulse voltage generator (500) is connected to the high-voltage end of the voltage divider (600); the second oscilloscope (800) is connected to the low-voltage end of the voltage divider (600) for measuring the waveform of the breakdown voltage; the second oscilloscope (800) is also connected to the second data transmitter (700). The second oscilloscope (800) is used to automatically start working when the voltage applied by the impulse voltage generator (500) reaches the preset trigger level of the second oscilloscope (800), and send a trigger signal to the second data transmitter (700). The second data transmitter (700) is used to receive the trigger signal sent by the second oscilloscope (800) and send the trigger signal to the first data transmitter; the second data transmitter (700) is also used to receive the voltage data returned by the first data transmitter and send the voltage data to the host computer (900).

9. The discharge current measurement system for the process of entering and exiting the equipotential during live working on transmission lines according to claim 8, wherein, The first data transmitter is also used for the conversion between optical signals and electrical signals and the conversion between optical signals and digital signals, including: The second data transmitter (700) is also used to convert the trigger signal from an electrical signal form to an optical signal form after receiving the trigger signal sent by the second oscilloscope (800), and then send the trigger signal in the optical signal form to the first data transmitter. The second data transmitter (700) is also used to convert the voltage data from an optical signal form to a digital signal form after receiving the voltage data sent by the first data transmitter, and then send the voltage data in the digital signal form to the host computer (900).

10. A method for measuring discharge current during the process of entering and exiting the equipotential for live working on transmission lines, based on the system described in claim 8, characterized in that, The method includes the following steps: S1. Arrange the system, wherein the device is suspended in the gap to be measured through the hanging assembly by using an insulating rope and an insulating bracket; the ground potential measuring device is arranged at a position far from the gap to be measured. S2. Open the data analysis software of the first oscilloscope and the second oscilloscope (800) in the host computer (900), open the ports of the corresponding probes, and adjust the voltage display magnification and waveform width parameters; control the impulse voltage generator (500) to apply a voltage. When the voltage rises to the preset trigger level of the second oscilloscope (800), the second oscilloscope (800) starts to record the applied voltage waveforms before and after the trigger moment and sends a trigger signal to the second data transmitter (700). S3. The second data transmitter (700) receives the trigger signal and sends the trigger signal to the first data transmitter. S4. The first data transmitter receives the trigger signal and sends the trigger signal to the first oscilloscope. S5. The first oscilloscope acquires the voltage data of the measuring resistor (200) according to the trigger signal and sends the voltage data to the first data transmitter. S6. The first data transmitter receives the voltage data and sends the voltage data to the second data transmitter (700). S7. The second data transmitter (700) receives the voltage data and sends the voltage data to the host computer (900).

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