CN212301813U - Line selection device for ground fault of low-current grounding system - Google Patents
Line selection device for ground fault of low-current grounding system Download PDFInfo
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- CN212301813U CN212301813U CN202020110972.7U CN202020110972U CN212301813U CN 212301813 U CN212301813 U CN 212301813U CN 202020110972 U CN202020110972 U CN 202020110972U CN 212301813 U CN212301813 U CN 212301813U
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Abstract
The utility model discloses a undercurrent ground system earth fault's route selection device, by the circuit that takes place single-phase ground connection, it is compared in this principle that normal circuit's earth leakage resistance reduces by a wide margin to earth leakage resistance, continuously monitor zero sequence voltage and zero sequence current through the collection subassembly, the processing module calculates earth leakage resistance in order to elect the fault line, the executive module is to the circuit tripping operation of electing in order to get rid of the trouble, when still having earth fault, can repeat above-mentioned route selection step, get rid of completely until the trouble, the device has higher sensitivity and accuracy, and it is little influenced by external environment factor.
Description
Technical Field
The utility model relates to a undercurrent ground connection technical field especially relates to a undercurrent ground connection system ground fault's route selection device.
Background
The medium-voltage distribution network in China generally adopts a small-current grounding mode, namely, a neutral point is not grounded, the neutral point is grounded through an arc suppression coil, and the neutral point is grounded through a resistor. Its advantages are low fault current, no need of immediate trip of switch when it is instantaneously grounded, and high reliability of power supply. However, for a permanent ground fault, such as insulation damage, it is very easy to develop into a two-point or multi-point ground fault, if an arc grounding occurs, it will also cause a whole system overvoltage, damage the power equipment, cause property loss, and generate a great potential safety hazard, and to prevent the accident from expanding, the fault line must be quickly and accurately selected and cut off in time.
When the power distribution network has ground fault, the fault current is very small and is mixed with load current which is much larger than the fault current and various complex interferences, so that the characteristics of fault electrical quantity in the system are not obvious, and the problem of line selection becomes more complex due to the changeful operation mode of the system. For a long time, technicians in the field carry out a great deal of research on the line selection problem and put forward various solutions, but because the distribution network in China is continuously improved and developed, the existing line selection method and device can not completely solve the line selection problem of all ground faults on the basis of the actual operation effect of the field.
Therefore, a line selection device for a ground fault of a low-current grounding system is needed, and the problem that the actual operation effect is poor due to the fact that the existing line selection device cannot adapt to improvement and development of a power distribution network and is easily influenced by a complex environment can be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a undercurrent grounding system earth fault's route selection device to solve above-mentioned current route selection device and can not adapt to the improvement and the development of distribution network, easily receive the influence of complex environment, lead to the poor problem of actual operation effect.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a line selection device for ground fault of a low-current grounding system, which comprises an acquisition component, a processing component and an execution component;
the acquisition assembly is connected with the grounding circuit and is used for measuring the zero sequence voltage and zero sequence current of the grounding circuit;
the processing assembly comprises an analog quantity synchronous acquisition module, a central processing unit and a trip output module, wherein the analog quantity synchronous acquisition module is electrically connected with the acquisition assembly and is used for continuously receiving zero-sequence voltage and zero-sequence current to obtain analog quantity zero-sequence voltage and analog quantity zero-sequence current; the central processing unit is electrically connected with the analog quantity synchronous acquisition module and used for calculating to obtain earth leakage resistance according to the analog quantity zero-sequence voltage and the analog quantity zero-sequence current and judging whether the line is grounded in a single phase or not according to the earth leakage resistance; the trip output module is respectively electrically connected with the central processor and the execution assembly and is used for making a trip instruction to the execution assembly according to a judgment result;
the power supply is electrically connected with the acquisition assembly, the processing assembly and the execution assembly respectively and supplies power to the processing assembly and the execution assembly.
Preferably, the acquisition assembly comprises a zero sequence voltage transformer and a zero sequence current transformer, the zero sequence voltage transformer and the zero sequence current transformer are respectively and electrically connected with the analog quantity synchronous acquisition module, and the zero sequence voltage transformer is mounted on the bus and used for measuring the zero sequence voltage of the bus; the zero sequence current transformers are arranged on the branches and used for measuring zero sequence currents of the branches.
Preferably, the processing assembly further comprises a touch screen, and the touch screen is electrically connected with the central processing unit and is used for displaying line information and manually inputting control instructions.
Preferably, the processing assembly further comprises a communication module, the communication module is electrically connected with the central processing unit, is externally connected with a terminal device, and is used for transmitting the line information to the terminal device.
Preferably, the connection mode of the terminal device and the communication module is 485 bus connection, WiFi connection, Bluetooth connection or 3G/4G/5G connection.
Preferably, the executing assembly adopts circuit breakers, and the circuit breakers are respectively installed on the branches.
The utility model discloses following beneficial technological effect has been gained for prior art:
1. the utility model provides a pair of undercurrent grounding system earth fault's route selection device even also can guarantee higher sensitivity and the degree of accuracy when the high resistance ground connection, and the route selection is quick accurate.
2. The utility model provides a pair of undercurrent grounding system earth fault's route selection device can elect many ground connection circuit simultaneously, and can continuous monitoring, and route selection is efficient, and troubleshooting is rapidly and the accuracy is high.
3. The utility model provides a pair of undercurrent grounding system ground fault's route selection device, because to ground leakage resistance not receive arc suppression coil's influence, therefore whether irrelevant with the arc suppression coil of installation, the route selection device receives environmental impact little, strong adaptability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a connection relationship between a line selection device for a ground fault of a low-current grounding system according to the present invention;
in the figure: 1: collection assembly, 11: zero sequence voltage transformer, 12: zero sequence current transformer, 2: processing assembly, 21: analog quantity synchronous acquisition module, 22: central processing unit, 23: trip output module, 24: touch screen, 25: communication module, 3: execution component, 4: and (4) terminal equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a undercurrent grounding system earth fault's route selection device carries out the route selection through detecting earth leakage resistance of ground connection circuit to solve current route selection device and can not adapt to the improvement and the development of distribution network, easily receive the influence of complex environment, lead to the poor problem of actual operation effect.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example 1:
the embodiment provides a line selection device for a ground fault of a low-current grounding system, as shown in fig. 1, which includes an acquisition component 1, a processing component 2 and an execution component 3; the acquisition assembly 1 is connected with a grounding circuit and is used for measuring zero sequence voltage and zero sequence current of the grounding circuit; the processing assembly 2 comprises an analog quantity synchronous acquisition module 21, a central processing unit 22 and a trip output module 23, wherein the analog quantity synchronous acquisition module 21 is electrically connected with the acquisition assembly 1 and is used for continuously receiving zero-sequence voltage and zero-sequence current to obtain analog quantity zero-sequence voltage and analog quantity zero-sequence current; the central processing unit 22 is electrically connected with the analog quantity synchronous acquisition module 21, and is used for calculating to obtain earth leakage resistance according to the analog quantity zero-sequence voltage and the analog quantity zero-sequence current, and judging whether the line is grounded in a single phase or not according to the earth leakage resistance; the trip output module 23 is electrically connected with the central processing unit 22 and the execution component 3 respectively, and is used for making a trip instruction to the execution component 3 according to the judgment result; the device also comprises a power supply which is respectively electrically connected with the acquisition assembly 1, the processing assembly 2 and the execution assembly 3 and supplies power to the acquisition assembly, the processing assembly and the execution assembly.
Specifically, the acquisition assembly 1 comprises a zero sequence voltage transformer 11 and a zero sequence current transformer 12, the zero sequence voltage transformer 11 and the zero sequence current transformer 12 are respectively electrically connected with an analog quantity synchronous acquisition module 21, and the zero sequence voltage transformer 11 is installed on a bus and used for measuring the zero sequence voltage of the bus; the zero sequence current transformers 12 are installed on each branch and used for measuring zero sequence currents of the branches.
Further, the processing assembly 2 further includes a touch screen 24, and the touch screen 24 is electrically connected to the central processing unit 22 and is used for displaying the line information and manually inputting the control command, so that the fault can be observed and removed more intuitively and conveniently.
Further, the processing assembly 2 further includes a communication module 25, the communication module 25 is electrically connected to the central processing unit 22 and is externally connected to the terminal device 4, so as to transmit the line information to the terminal device 4, thereby facilitating remote acquisition of the line information.
Further, terminal equipment 4 is 4G internet access with communication module 25's connected mode, can also choose 485 bus connection, wiFi to connect, bluetooth is connected or 3G 5G is connected in other embodiments, all is the utility model discloses the within range of protection.
Furthermore, the actuating assembly 3 adopts circuit breakers, and the circuit breakers are respectively installed on the branches.
The utility model provides a pair of undercurrent grounding system earth fault's route selection device, its theory of operation is: the zero sequence voltage transformer 11 and the zero sequence current transformer 12 can acquire zero sequence voltage on a bus and zero sequence current on a branch circuit in real time, the zero sequence voltage and the zero sequence current are transmitted to the central processing unit 22 through the analog quantity synchronous acquisition module 21, the central processing unit 22 calculates the earth leakage resistance of a circuit, then the single-phase earth circuit is judged according to the principle that the earth leakage resistance of the single-phase earth circuit is greatly reduced compared with the earth leakage resistance of a normal circuit when the single-phase earth circuit occurs, a trip instruction is sent to the trip output module 23, the trip output module 23 controls the execution assembly 3 to cut off a fault circuit, if the fault is eliminated, only the fault circuit needs to be overhauled, and if the fault still exists, the device can repeat the line selection step until the fault is completely eliminated.
The utility model discloses the principle and the implementation mode of the utility model are explained by applying the concrete examples, and the explanation of the above examples is only used for helping to understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present description should not be construed as a limitation of the present invention.
Claims (6)
1. The utility model provides a line selection device of undercurrent grounding system ground fault which characterized in that: the device comprises an acquisition component, a processing component and an execution component;
the acquisition assembly is connected with the grounding circuit and is used for measuring the zero sequence voltage and zero sequence current of the grounding circuit;
the processing assembly comprises an analog quantity synchronous acquisition module, a central processing unit and a trip output module, wherein the analog quantity synchronous acquisition module is electrically connected with the acquisition assembly and is used for continuously receiving zero-sequence voltage and zero-sequence current to obtain analog quantity zero-sequence voltage and analog quantity zero-sequence current; the central processing unit is electrically connected with the analog quantity synchronous acquisition module and used for calculating to obtain earth leakage resistance according to the analog quantity zero-sequence voltage and the analog quantity zero-sequence current and judging whether the line is grounded in a single phase or not according to the earth leakage resistance; the trip output module is respectively electrically connected with the central processor and the execution assembly and is used for making a trip instruction to the execution assembly according to a judgment result;
the power supply is electrically connected with the acquisition assembly, the processing assembly and the execution assembly respectively and supplies power to the processing assembly and the execution assembly.
2. The small current grounding system ground fault line selection device of claim 1, wherein: the acquisition assembly comprises a zero sequence voltage transformer and a zero sequence current transformer, the zero sequence voltage transformer and the zero sequence current transformer are respectively and electrically connected with the analog quantity synchronous acquisition module, and the zero sequence voltage transformer is arranged on the bus and used for measuring the zero sequence voltage of the bus; the zero sequence current transformers are arranged on the branches and used for measuring zero sequence currents of the branches.
3. The small current grounding system ground fault line selection device of claim 1, wherein: the processing assembly further comprises a touch screen, and the touch screen is electrically connected with the central processing unit and used for displaying line information and manually inputting control instructions.
4. The small current grounding system ground fault line selection device of claim 1, wherein: the processing assembly further comprises a communication module, wherein the communication module is electrically connected with the central processing unit, is externally connected with terminal equipment and is used for transmitting the line information to the terminal equipment.
5. The small current grounding system ground fault line selection device of claim 4, wherein: the connection mode of the terminal equipment and the communication module is 485 bus connection, WiFi connection, Bluetooth connection or 3G/4G/5G connection.
6. The small current grounding system ground fault line selection device of claim 1, wherein: the execution assembly adopts circuit breakers which are respectively arranged on the branches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020110972.7U CN212301813U (en) | 2020-01-17 | 2020-01-17 | Line selection device for ground fault of low-current grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020110972.7U CN212301813U (en) | 2020-01-17 | 2020-01-17 | Line selection device for ground fault of low-current grounding system |
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| Publication Number | Publication Date |
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| CN212301813U true CN212301813U (en) | 2021-01-05 |
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| CN202020110972.7U Expired - Fee Related CN212301813U (en) | 2020-01-17 | 2020-01-17 | Line selection device for ground fault of low-current grounding system |
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| CN (1) | CN212301813U (en) |
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- 2020-01-17 CN CN202020110972.7U patent/CN212301813U/en not_active Expired - Fee Related
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Granted publication date: 20210105 |