CN220552929U - Portable grounding line selection device and grounding line selection system - Google Patents
Portable grounding line selection device and grounding line selection system Download PDFInfo
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- CN220552929U CN220552929U CN202321925911.6U CN202321925911U CN220552929U CN 220552929 U CN220552929 U CN 220552929U CN 202321925911 U CN202321925911 U CN 202321925911U CN 220552929 U CN220552929 U CN 220552929U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 230000003993 interaction Effects 0.000 claims abstract description 22
- 238000011835 investigation Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 13
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000013024 troubleshooting Methods 0.000 claims description 5
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 238000005070 sampling Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
A portable grounding line selection device and a grounding line selection system comprise a shell, an analog-to-digital conversion module, a control module, a man-machine interaction module, a plurality of Hall sensors and plug-in connectors; when the fault detection is carried out on the line to be detected, a first connector of the Hall sensor is connected to a current acquisition port, a jaw is clamped on a current terminal block of the line to be detected, a second connector of the plug-in connector is connected to a voltage acquisition port, and a third connector is connected to a voltage terminal block; the Hall sensor transmits zero sequence current clamped from the current terminal strip and zero sequence voltage introduced from the voltage terminal strip to the analog-to-digital conversion module through the plug-in connector; the analog-to-digital conversion module carries out analog-to-digital conversion on the zero-sequence current and the zero-sequence voltage, then the analog-to-digital conversion module sends the zero-sequence current and the zero-sequence voltage to the control module, and the control module determines a line with faults according to the phase difference between the zero-sequence current and the zero-sequence voltage and displays the line through the man-machine interaction module. According to the scheme, the fault line can be conveniently and rapidly checked, and the fault checking time is shortened.
Description
Technical Field
The utility model relates to the technical field of operation and maintenance of power grids, in particular to a portable grounding line selection device and a grounding line selection system.
Background
The low-current grounding line selection device is a device for judging a fault line according to the voltage and current change condition accessed by a line protection device and is usually arranged in a protection chamber of a transformer substation. Under the condition that a 10 kilovolt line in a transformer substation fails, the small-current grounding line selection device can rapidly and accurately determine a specific failure line, and provides a basis for troubleshooting of maintenance personnel.
However, only a small part of the transformer substations are provided with small-current grounding line selection devices at present, and the small-current grounding line selection devices are fixedly arranged, namely terminals of the devices corresponding to all lines in the transformer substations are arranged through fixed lines, so that a large amount of time is required for installation and disassembly, and the fault detection time is greatly increased. And for the transformer substation without the small-current grounding line selection device, if a grounding fault occurs, the background in the substation only displays bus grounding, does not display a specific fault line, still requires a worker to go to the site, and the existing small-current grounding line selection device needs to perform line arrangement and installation, and the process can consume a great deal of manpower and time, so that the fault cannot be timely checked, and the power supply reliability of a power grid is seriously affected.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a portable grounding line selection device and a grounding line selection system capable of conveniently and rapidly performing line fault detection, so as to shorten the fault detection time.
In a first aspect, an embodiment of the present utility model provides a portable grounding line selection device, including: the device comprises a shell, an analog-to-digital conversion module, a control module, a man-machine interaction module, a plurality of Hall sensors and plug-in connectors;
the analog-to-digital conversion module, the control module and the man-machine interaction module are integrally arranged in the shell, and the analog-to-digital conversion module and the man-machine interaction module are electrically connected with the control module; the side surface of the shell is provided with at least one current acquisition port and one voltage acquisition port, and the current acquisition port and the voltage acquisition port are electrically connected with the analog-to-digital conversion module; the output end of the Hall sensor is a first connector which is matched with the current acquisition port, the input end of the Hall sensor is a jaw, the output end of the plug-in connector is a second connector which is matched with the voltage acquisition port, and the input end of the plug-in connector is a third connector which is convenient to plug;
when a fault is detected on a line to be detected, which is formed by a plurality of lines, a first connector of a Hall sensor is used for being connected to the current acquisition port, a jaw is clamped on a terminal connecting wire of a current terminal row of the line to be detected, a second connector of a plug-in connector is used for being connected to the voltage acquisition port, and a third connector is connected to a terminal connecting wire of a voltage terminal row of the line to be detected; the Hall sensor is used for clamping zero sequence currents corresponding to all lines from terminal wires of the current terminal strip and transmitting the zero sequence currents to the analog-to-digital conversion module, and the plug-in connector is used for transmitting bus zero sequence voltages introduced from the terminal wires of the voltage terminal strip to the analog-to-digital conversion module; the analog-to-digital conversion module is used for converting analog quantities of each zero-sequence current and each bus zero-sequence voltage into digital quantities and then transmitting the digital quantities to the control module, and the control module is used for determining a line with faults according to phase differences between the zero-sequence currents of each line after analog-to-digital conversion and each bus zero-sequence voltage and displaying the line with faults to a user through the man-machine interaction module.
Preferably, the man-machine interaction module comprises a display screen embedded on the surface of the shell, and the display screen is used for displaying the zero sequence current and the bus zero sequence voltage of each input line.
Preferably, the display screen is further used for displaying the line with the fault after the control module determines the line with the fault.
Preferably, the man-machine interaction module further comprises a plurality of keys; wherein, the button includes: the key is determined, turned up, turned down, returned and reset.
Preferably, the apparatus further comprises: the alarm module is electrically connected with the control module and consists of an alarm indicator lamp and a buzzer;
the control module is used for controlling the alarm indicator lamp to emit light after determining the line with the fault, and simultaneously controlling the buzzer to emit alarm audio so as to prompt a user to detect the line with the fault.
Preferably, the apparatus further comprises: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with a power grid control system;
the control module is used for transmitting the investigation process and the relevant data of the investigation result during the fault investigation to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
Preferably, the control module is used for sequencing the zero sequence currents of all the lines according to the sequence from the large current amplitude to the small current amplitude, and selecting a plurality of lines with possibly faults and with the current amplitudes sequenced at the front; the control module is further used for judging whether the phase difference between the bus zero sequence voltage and the zero sequence current of each line which is likely to be in fault meets the preset phase difference condition or not respectively, and determining the line which meets the preset phase difference condition as the line which is in fault.
In a second aspect, the present utility model further provides a ground line selection system, including: the portable grounding wire-selecting device, the current terminal block, the voltage terminal block, the current transformer, and the voltage transformer as described in any one of the first aspects;
the current transformer converts primary large current of each line in the lines to be tested into secondary small current through electromagnetic induction, and the secondary large current is introduced to a corresponding terminal connecting wire on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary high voltage into a terminal connecting wire on the voltage terminal strip;
the jaw of the Hall sensor of the portable grounding line selection device is respectively and sequentially clamped with each terminal wiring on the current terminal strip and is used for clamping secondary zero sequence current and inputting the secondary zero sequence current into the device; the third connector of the plug-in connector of the portable grounding line selection device is connected to the terminal wiring on the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device.
As can be seen from the above technical solutions, the portable grounding line selection device provided by the embodiments of the present utility model includes a housing, an analog-to-digital conversion module, a control module, a man-machine interaction module, a plurality of hall sensors, and plug connectors; the analog-to-digital conversion module, the control module and the man-machine interaction module are integrated inside the shell, and a current acquisition port and a voltage acquisition port are provided outside the shell. When fault line investigation is carried out, one end of the Hall sensor is connected to the current acquisition port, the jaw at the other end is clamped on the terminal connection wire of the current terminal strip, so that zero sequence current acquisition can be realized, one end of the plug-in type connector is connected to the voltage acquisition port, the other end of the plug-in type connector is plugged on the terminal connection wire of the voltage terminal strip, so that bus zero sequence voltage acquisition can be realized, and the control module can determine the fault line according to the acquired zero sequence current and bus zero sequence voltage. Therefore, the portable grounding line selection device provided by the scheme does not need to spend a large amount of time for line arrangement and installation when performing fault investigation, and can realize rapid installation only by plugging and unplugging the connector and clamping the jaw, so that the collection of zero sequence current and bus zero sequence voltage can be rapidly realized, and the time for fault investigation is greatly shortened.
Drawings
Fig. 1 is a schematic diagram of a portable grounding line selection device according to an embodiment of the present utility model.
Fig. 2 is a schematic front view of a portable grounding wire selecting device casing according to an embodiment of the present utility model.
Fig. 3 is a schematic side view of a portable grounding wire selecting device casing according to an embodiment of the present utility model.
Fig. 4 is a schematic diagram of a grounding line selection system according to an embodiment of the present utility model.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1-3, an embodiment of the present utility model provides a portable grounding line selection device, including: the device comprises a shell, an analog-to-digital conversion module, a control module, a man-machine interaction module, a plurality of Hall sensors and plug-in connectors;
the analog-to-digital conversion module, the control module and the man-machine interaction module are integrated and arranged in the shell, and the analog-to-digital conversion module and the man-machine interaction module are electrically connected with the control module; the side surface of the shell is provided with at least one current acquisition port and one voltage acquisition port, and the current acquisition port and the voltage acquisition port are electrically connected with the analog-to-digital conversion module; the output end of the Hall sensor is a first connector which is matched with the current acquisition port, the input end of the Hall sensor is a jaw, the output end of the plug-in connector is a second connector which is matched with the voltage acquisition port, and the input end of the Hall sensor is a third connector which is convenient to plug;
when a fault is detected on a line to be detected, which is formed by a plurality of lines, a first connector of the Hall sensor is used for being connected to a current acquisition port, a jaw is clamped on a terminal connecting wire of a current terminal strip of the line to be detected, a second connector of the plug-in connector is used for being connected to a voltage acquisition port, and a third connector is connected to a terminal connecting wire of a voltage terminal strip of the line to be detected; the Hall sensor is used for clamping zero sequence currents corresponding to all lines from terminal wires of the current terminal strip and transmitting the zero sequence currents to the analog-to-digital conversion module, and the plug-in connector is used for transmitting bus zero sequence voltages introduced from the terminal wires of the voltage terminal strip to the analog-to-digital conversion module; the analog-to-digital conversion module is used for converting analog quantities of each zero-sequence current and each bus zero-sequence voltage into digital quantities and then transmitting the digital quantities to the control module, and the control module is used for determining a line with faults according to phase differences between the zero-sequence currents of each line after analog-to-digital conversion and each bus zero-sequence voltage and displaying the line with faults to a user through the man-machine interaction module.
In this embodiment, the analog-to-digital conversion module, the control module and the output module are integrated in a PCB circuit board, the PCB circuit board is assembled outside through a housing, a voltage acquisition port and a current acquisition port connected with the analog-to-digital conversion module are provided on the housing, and the hall sensor is connected with the plug-in connector through the ports. As shown in the figure, 6 current collection ports are provided, and since the voltages of the respective lines are the same, 1 voltage collection port is provided. In addition, the side of the device is also provided with a power switch, power connection ports K1 and K2 and alarm output contacts P1 and P2.
In this embodiment, the analog-to-digital conversion module adopts the AD7663 chip as a main component for circuit design, and the AD7663 chip has the advantages of high sampling frequency, low error, low power consumption and low cost, and is suitable for application to the analog-to-digital conversion module of this scheme for analog-to-digital conversion.
In this embodiment, the control module adopts a design using a DSP chip as a main control component, the DSP chip is a unique microprocessor, has its own complete instruction system, is a device for processing a large amount of information by using digital signals, has a timing running speed up to tens of millions of complex instruction programs per second, is suitable for complex calculation, has a pin number greater than or equal to 144 processes, and has the advantages of good performance and easy development.
In one embodiment, the man-machine interaction module comprises a display screen embedded on the surface of the shell, wherein the display screen is used for displaying the zero sequence current and the bus zero sequence voltage of each input line. The display screen is also used for displaying the failed line after the control module determines the failed line.
In this embodiment, the sampled zero-sequence current and the bus zero-sequence voltage may be displayed to the user through the display screen, and the user may learn the sampled situation in real time, and make a preliminary judgment on the situation of each line according to the sampled zero-sequence current and the bus zero-sequence voltage. For example, when a certain zero sequence current is stable near 0, a user can directly judge that the line does not have a fault, so that logic verification can be further performed according to analysis of the control module.
In addition, as shown in the figure, the shell size of this device is 155mm 120mm 38mm, and inside display screen size 79.5mm 55.88mm, whole device is small, compact structure, conveniently carries.
Further, the man-machine interaction module also comprises a plurality of keys; wherein, the button includes: the key is determined, turned up, turned down, returned and reset. In this embodiment, the key detection personnel can execute the operations of checking the content on the display screen, and resetting the device, so as to ensure that the device is in a resetting state when each line is checked, and further improve the accuracy of the fault line checked by the device.
In one embodiment, the apparatus further comprises: the alarm module is electrically connected with the control module and consists of an alarm indicator lamp and a buzzer;
the control module is used for controlling the alarm indicator lamp to emit light after determining the line with the fault, and simultaneously controlling the buzzer to emit alarm audio so as to prompt a user to detect the line with the fault.
In this embodiment, when a line with a fault is detected by the alarm module, a user can be prompted timely, so that the user can record the line in time, namely, the fault is removed, thereby shortening the time for maintaining the fault in the fault line, improving the reliability of power supply of the power grid, and enabling the power consumer to have better experience. For example, when a line with a fault is detected, the control module controls the alarm indicator lamp to emit light and controls the buzzer to emit alarm sound so as to prompt a detector.
In one embodiment, the apparatus further comprises: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with the power grid control system;
the control module is used for transmitting the troubleshooting process and the relevant data of the troubleshooting result to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
In this embodiment, the data generated during fault investigation and the related data of the fault investigation result can be uploaded to the power grid control system in time through the communication module, so that the power grid control system can record the current investigation work in time and store corresponding data information, so that the power grid system can analyze according to the condition of each fault line, and the operation and optimization of the power grid system can be better realized. For example, by analyzing that the a1 line fails multiple times in the multiple shared lines a in a certain area, when the multiple shared lines a fail again, the operation and maintenance personnel can detect and check the a1 line preferentially, so that the time for checking the failed line is further shortened.
It is easy to understand that the low-current grounding line selection device also comprises a power supply module for supplying power to the device, the power supply module can be an AC-DC switching power supply of the ABL2 model, and the switching power supply of the model has small voltage fluctuation and better voltage stability, thereby being more beneficial to the work and service life of components. Likewise, a power indicator light should be provided on the device to determine whether the device is powered properly.
In addition, when determining the line with fault according to the zero sequence current and the bus zero sequence voltage, the control module is also used for sequencing the zero sequence current of each line according to the sequence from the large current amplitude to the small current amplitude, and selecting a plurality of lines with the current amplitudes sequenced at the front and possibly with fault; the control module is further used for judging whether the phase difference between the bus zero sequence voltage and the zero sequence current of each line which is likely to be in fault meets the preset phase difference condition or not respectively, and determining the line which meets the preset phase difference condition as the line which is in fault.
In this embodiment, the phase difference of the zero sequence currents lags the phase difference of the zero sequence voltages of the bus by 90 degrees in the line with faults, but the signal is considered to have fluctuation. Thus, in the present embodiment, the phase difference threshold range may be set to 90±5 degrees. Judging whether the phase difference between the voltage signals of the lines and the current signals of the lines is between 90+/-5 degrees for the lines corresponding to the selected m current signals with relatively large current amplitudes, and if so, determining that the lines have faults; if not, it is determined that the line has not failed. Therefore, the fault line is deleted through the current amplitude, and then the phase difference between the voltage and the current is utilized to further determine the fault line, so that the fault line checking accuracy is greatly improved.
As shown in fig. 4, the embodiment of the present utility model further provides a ground line selection system, including: the portable grounding line selection device, the current terminal strip, the voltage terminal strip, the current transformer and the voltage transformer according to any of the embodiments;
the current transformer converts primary large current of each line in the line to be tested into secondary small current through electromagnetic induction, and the secondary large current is introduced to a corresponding terminal connecting wire on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary low voltage to a terminal connecting wire on a voltage terminal strip;
the jaw of the Hall sensor of the portable grounding line selection device is respectively and sequentially clamped with each terminal wiring on the current terminal row for clamping the secondary zero sequence current and inputting the secondary zero sequence current into the device; the third connector of the plug-in connector of the portable grounding line selection device is connected to a terminal wiring on the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device.
In this embodiment, the collection of electric current and voltage is carried out through current transformer and voltage transformer to circuit one side to await measuring to introduce the electric current and the voltage of gathering on the wiring of corresponding terminal strip, so little electric current ground connection route selection device can connect through plug or the mode of pincers and get directly, and then can shorten the time of trouble line investigation greatly, improves the efficiency of trouble investigation.
Compared with the prior art, the scheme has the following beneficial effects:
1) The scheme adopts a portable sampling mode, effectively shortens the investigation time of the 10kV system ground fault line, and has flexible movement, comprehensive technology and strong practicability.
2) The device provided by the scheme does not need to disconnect the voltage and current wiring in the use process, realizes the ground fault checking work on the premise that a voltage and current loop is not changed, and ensures the safety of equipment and a power grid. Meanwhile, the device is small in size, easy to carry and beneficial to quick installation and arrangement.
3) The device provided by the scheme is directly inserted into the terminal strip test terminal through the prefabricated plug-in type head to access the bus zero sequence voltage, is simple to operate, and has no high requirement on the skill level of the user of the device.
4) The device provided by the scheme does not need a longer test cable when in field practical application, and is less restricted by field practical application conditions and environments.
The modules or units in the device of the embodiment of the utility model can be combined, divided and deleted according to actual needs. The foregoing disclosure is illustrative of the preferred embodiments of the present utility model, and is not to be construed as limiting the scope of the utility model, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the utility model as defined by the appended claims.
Claims (8)
1. A portable ground wire selection device, comprising: the device comprises a shell, an analog-to-digital conversion module, a control module, a man-machine interaction module, a plurality of Hall sensors and plug-in connectors;
the analog-to-digital conversion module, the control module and the man-machine interaction module are integrally arranged in the shell, and the analog-to-digital conversion module and the man-machine interaction module are electrically connected with the control module; the side surface of the shell is provided with at least one current acquisition port and one voltage acquisition port, and the current acquisition port and the voltage acquisition port are electrically connected with the analog-to-digital conversion module; the output end of the Hall sensor is a first connector which is matched with the current acquisition port, the input end of the Hall sensor is a jaw, the output end of the plug-in connector is a second connector which is matched with the voltage acquisition port, and the input end of the plug-in connector is a third connector which is convenient to plug;
when a fault is detected on a line to be detected, which is formed by a plurality of lines, a first connector of a Hall sensor is used for being connected to the current acquisition port, a jaw is clamped on a terminal connecting wire of a current terminal row of the line to be detected, a second connector of a plug-in connector is used for being connected to the voltage acquisition port, and a third connector is connected to a terminal connecting wire of a voltage terminal row of the line to be detected; the Hall sensor is used for clamping zero sequence currents corresponding to all lines from the terminals of the current terminal strip and transmitting the zero sequence currents to the analog-to-digital conversion module, and the plug-in connector is used for transmitting bus zero sequence voltages introduced from the terminal wiring of the voltage terminal strip to the analog-to-digital conversion module; the analog-to-digital conversion module is used for converting analog quantities of each zero-sequence current and each bus zero-sequence voltage into digital quantities and then transmitting the digital quantities to the control module, and the control module is used for determining a line with faults according to phase differences between the zero-sequence currents of each line after analog-to-digital conversion and each bus zero-sequence voltage and displaying the line with faults to a user through the man-machine interaction module.
2. The portable grounding wire selection device according to claim 1, wherein the man-machine interaction module comprises a display screen embedded on the surface of the shell, and the display screen is used for displaying the zero sequence current and the bus zero sequence voltage of each input wire.
3. The portable grounding wire selection apparatus of claim 2, wherein the display screen is further configured to display the failed wire after the control module determines the failed wire.
4. The portable grounding wire selection apparatus of claim 3, wherein the man-machine interaction module further comprises a plurality of keys; wherein, the button includes: the key is determined, turned up, turned down, returned and reset.
5. A portable grounding wire selection apparatus according to claim 3, further comprising: the alarm module is electrically connected with the control module and consists of an alarm indicator lamp and a buzzer;
the control module is used for controlling the alarm indicator lamp to emit light after determining the line with the fault, and simultaneously controlling the buzzer to emit alarm audio so as to prompt a user to detect the line with the fault.
6. The portable grounding wire selection apparatus of claim 1, further comprising: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with a power grid control system;
the control module is used for transmitting the troubleshooting process and the relevant data of the troubleshooting result to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
7. The portable grounding wire selection device according to claim 1, wherein the control module is used for sequencing zero sequence currents of all the wires in order of current amplitude values from large to small, and selecting a plurality of wires with current amplitude values sequenced at the front and possibly faulty; the control module is further used for judging whether the phase difference between the bus zero sequence voltage and the zero sequence current of each line which is likely to be in fault meets the preset phase difference condition or not respectively, and determining the line which meets the preset phase difference condition as the line which is in fault.
8. A ground line selection system, comprising: the portable grounding wire-selecting device, current terminal block, voltage terminal block, current transformer and voltage transformer as claimed in any one of claims 1 to 7;
the current transformer converts primary large current of each line in the lines to be tested into secondary small current through electromagnetic induction, and the secondary large current is introduced to a corresponding terminal connecting wire on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary high voltage into a terminal connecting wire on the voltage terminal strip;
the jaw of the Hall sensor of the portable grounding line selection device is respectively and sequentially clamped with each terminal wiring on the current terminal strip and is used for clamping secondary zero sequence current and inputting the secondary zero sequence current into the device; the third connector of the plug-in connector of the portable grounding line selection device is connected to the terminal wiring on the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321925911.6U CN220552929U (en) | 2023-07-21 | 2023-07-21 | Portable grounding line selection device and grounding line selection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321925911.6U CN220552929U (en) | 2023-07-21 | 2023-07-21 | Portable grounding line selection device and grounding line selection system |
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|---|---|
| CN220552929U true CN220552929U (en) | 2024-03-01 |
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| CN202321925911.6U Active CN220552929U (en) | 2023-07-21 | 2023-07-21 | Portable grounding line selection device and grounding line selection system |
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| CN (1) | CN220552929U (en) |
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- 2023-07-21 CN CN202321925911.6U patent/CN220552929U/en active Active
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