CN215180777U - Data acquisition device for unreliable ground fault monitoring - Google Patents
Data acquisition device for unreliable ground fault monitoring Download PDFInfo
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- CN215180777U CN215180777U CN202120848867.8U CN202120848867U CN215180777U CN 215180777 U CN215180777 U CN 215180777U CN 202120848867 U CN202120848867 U CN 202120848867U CN 215180777 U CN215180777 U CN 215180777U
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Abstract
The utility model relates to the technical field of monitoring of direct current power supply systems, in particular to a data acquisition device for monitoring an inarchable grounding fault, which comprises a monitoring auxiliary machine connected with a plurality of line selection modules respectively; the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit and an auxiliary machine power supply unit, wherein the auxiliary machine main control unit is connected with the auxiliary machine communication display unit; the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, and the line selection communication unit is connected with the auxiliary machine communication display unit. The utility model discloses a route selection module has realized the collection judgement to a plurality of CT's real-time current signal, realizes earth fault's route selection location, accomplishes remote signal's auxiliary transmission through the monitoring auxiliary engine simultaneously, has guaranteed the stability of transmission, has guaranteed data acquisition's efficiency for it is more accurate to monitor the rear end to the monitoring of DC power supply system's inarching ground fault.
Description
Technical Field
The utility model relates to a direct current power supply system monitors technical field, is a data acquisition device that is used for not earthing fault monitoring.
Background
The direct current system is a power supply system of secondary equipment of the transformer substation, the direct current system network of the transformer substation is huge, and the direct current power supply system is designed into an ungrounded system, so that the occurrence of protection misoperation or operation failure accidents caused by the fact that a ground fault forms a wrong loop is avoided. In the existing insulation monitoring system of the running DC power supply system, current signals are collected at the front end and then transmitted back to the rear end for analysis and judgment, line selection (namely fault location) cannot be completed at the front end, in the process, if the transmission distance is long, the transmitted signals are easy to cause loss and other conditions, and meanwhile, the current signals of a plurality of front ends cannot be judged and analyzed simultaneously, so that the monitoring efficiency and the accuracy are reduced.
Disclosure of Invention
The utility model provides a data acquisition device for unreliable ground fault monitoring has overcome above-mentioned prior art not enough, and it can effectively solve the current signal that current DC power supply system fault monitoring system's data acquisition process exists and can not gather a plurality of direct current generating lines simultaneously, and can not accomplish the problem of route selection at the front end.
The technical scheme of the utility model is realized through following measure: a data acquisition device for monitoring an unreliable ground fault comprises a monitoring auxiliary machine and a plurality of line selection modules, wherein the monitoring auxiliary machine is respectively connected with the line selection modules; the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit and an auxiliary machine power supply unit, wherein the auxiliary machine main control unit is connected with the auxiliary machine communication display unit, and the auxiliary machine power supply unit supplies power for the monitoring auxiliary machine; the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, the line selection communication unit is connected with the auxiliary machine communication display unit, and the line selection power supply unit supplies power for the line selection module.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the current acquisition unit comprises a first amplification circuit and a second amplification circuit, and the first amplification circuit is connected with the second amplification circuit.
The line selection master control unit comprises a line selection master control module, a line selection storage module and a fault indication module, wherein the line selection storage module and the fault indication module are connected with the line selection master control unit.
The monitoring auxiliary machine further comprises an auxiliary machine storage unit, and the auxiliary machine storage unit is connected with the auxiliary machine master control unit.
The auxiliary machine communication display unit comprises an auxiliary machine communication module and an auxiliary machine display unit, and the auxiliary machine communication module and the auxiliary machine display unit are both connected with the auxiliary machine main control unit.
The monitoring auxiliary machine also comprises an auxiliary machine insulating shell, an auxiliary machine main control unit, an auxiliary machine power supply unit and an auxiliary machine storage unit are arranged in the auxiliary machine insulating shell, and an auxiliary machine communication module and an auxiliary machine display unit are arranged on the auxiliary machine insulating shell; and the monitoring auxiliary machine further comprises a line selection insulating shell, the line selection main control module, the current acquisition unit, the storage unit and the line selection power supply unit are arranged in the line selection insulating shell, and the fault indication module and the line selection communication unit are arranged on the line selection insulating shell.
The utility model discloses simple structure, convenient to use have realized collection, the judgement to a plurality of CT's real-time current signal through the route selection module, realize earth fault's route selection location, accomplish remote signal's auxiliary transmission through the monitoring auxiliary engine simultaneously, have guaranteed the stability of transmission, have guaranteed data acquisition's stability for it is more accurate to monitor the rear end to the monitoring of direct current power supply system's not earthing fault.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a second power conversion output module according to an embodiment of the present invention.
Fig. 3 is a circuit structure diagram of 485 communication circuit in the embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a network communication interface circuit according to an embodiment of the present invention.
Fig. 5 is a schematic circuit structure diagram of the current collecting unit in the embodiment of the present invention.
Fig. 6 is a schematic circuit structure diagram of the auxiliary device storage unit and the line selection storage module in the embodiment of the present invention.
Fig. 7 is a schematic circuit diagram of a display module according to an embodiment of the present invention.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1, the data acquisition device for unreliable ground fault monitoring includes a monitoring auxiliary machine and a plurality of line selection modules, wherein the monitoring auxiliary machine is respectively connected with the plurality of line selection modules; the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit and an auxiliary machine power supply unit, wherein the auxiliary machine main control unit is connected with the auxiliary machine communication display unit, and the auxiliary machine power supply unit supplies power for the monitoring auxiliary machine; the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, the line selection communication unit is connected with the auxiliary machine communication display unit, and the line selection power supply unit supplies power for the line selection module.
Above-mentioned technical scheme a plurality of route selection modules can be connected to a monitoring auxiliary engine (the utility model discloses a 16 route selection modules can be connected to a monitoring auxiliary engine), and a plurality of current transformer CT can be connected to a route selection module, gathers a plurality of current transformer CT's current signal promptly (the utility model discloses a 14 current transformer CT can be connected to a route selection module, 14 collection branch roads form promptly). The line selection module collects and processes current signals of a plurality of current transformers CT, judges whether the current is abnormal or not and realizes line selection and positioning of a grounding fault; the monitoring auxiliary machine builds a transmission link between each line selection module and a monitoring rear end (such as a server, an upper computer and the like), and is used for transmitting current signals, judgment signals and the like acquired by the line selection module at the far end to the monitoring rear end and transmitting control commands and the like of the monitoring rear end to the corresponding line selection modules.
In the above technical solution, the line selection module includes a line selection master control unit, a current collection unit, a line selection communication unit and a line selection power supply unit, wherein the line selection power supply unit may include a first power conversion output module and a second power conversion output module, wherein the first power conversion output module is configured to convert 110V/220VAC into a required voltage, for example, convert 110V/220VAC into 5V (for supplying power to a digital circuit and an analog circuit) and 24VDC (for supplying power to a display and measurement portion), and a bright power supply module may be selected here; because the utility model discloses a power supply demand of digital circuit parts such as total accuse unit, so set up the second power conversion output module, be used for converting 5VDC into 3.3VDC, the utility model discloses in can adopt power chip ASM1117 to realize, specifically as shown in figure 2; the current acquisition unit is used for connecting the current transformer CT and acquiring a corresponding real-time current signal; the line selection master control unit is used for judging whether the received current is abnormal or not, judging that a ground fault occurs if the received current is abnormal, and recording waves, so that line selection positioning of the ground fault is realized; the line selection communication unit can comprise a 485 communication circuit and a network communication interface circuit; the 485 communication circuit can be as shown in fig. 3, and comprises a level conversion chip SN75LBC184, the chip converts the signal output by the master control unit into a 485 level signal, and a 4-bit connection terminal CON2 is also placed on the PCB board, which facilitates the connection of the connection terminal provided in the utility model; the network communication interface circuit may be as shown in fig. 4.
In the technical scheme, the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit and an auxiliary machine power supply unit, wherein the auxiliary machine power supply unit can convert 110V/220VAC into required voltage, for example, 110V/220VAC into 5V (for supplying power to a digital circuit and an analog circuit) and 24VDC (for supplying power to a display and measurement part), and a Mingwei power supply module can be selected; the auxiliary machine main control unit can be an STM32F103ZET6 chip, the STM32F103ZET6 chip is an ARM 32-bit Cortex-M3 CPU, and the auxiliary machine main control unit has the characteristics of high running speed, large storage capacity, low power consumption and a large number of various functional interfaces; the auxiliary machine communication display unit is used for transmitting current signals, judgment signals and the like collected by the far-end line selection module to the monitoring rear end, and transmitting control commands and the like of the monitoring rear end to the corresponding line selection module.
The working process of the utility model is as follows:
the line selection module collects real-time current signals of each connected CT, acquires a control command at the monitoring rear end through the monitoring auxiliary machine, performs line selection, namely judges whether the real-time current signals of the CTs are abnormal (namely, compares the real-time current signals with a current preset value), and completes line selection positioning of a ground fault and records abnormal current in response to the judgment.
To sum up the utility model discloses simple structure, convenient to use have realized collection, the judgement to a plurality of CT's real-time current signal through the route selection module, realize earth fault's route selection location, accomplish remote signal's auxiliary transmission through the monitoring auxiliary engine simultaneously, have guaranteed the stability of transmission, have guaranteed data acquisition's stability for it is more accurate to monitor the rear end to the monitoring of direct current power supply system's not ground fault that can lean on.
The data acquisition device for the unreliable ground fault monitoring can be further optimized or/and improved according to actual needs:
as shown in fig. 5, the current collecting unit includes a first amplifying circuit and a second amplifying circuit, and the first amplifying circuit is connected to the second amplifying circuit.
In the technical scheme, after current is induced by CT and amplified by the first amplifying circuit and the second amplifying circuit in sequence, the AD conversion is carried out by the line selection master control unit.
As shown in fig. 1, the line selection master control unit includes a line selection master control module, a line selection storage module and a fault indication module, and both the line selection storage module and the fault indication module are connected to the line selection master control unit.
In the technical scheme, the line selection main control module is the prior known technology and can be an STM32F103ZET6 chip, and the STM32F103ZET6 chip is an ARM 32-bit Cortex-M3 CPU, and has the characteristics of high running speed, large storage capacity, low power consumption and numerous functional interfaces; the line selection storage module can be an 8G memory core circuit and is used for storing information data obtained by the line selection main control module, and the specific circuit is shown in figure 6; the fault indication module may be a fault indicator light.
As shown in fig. 1, the monitoring auxiliary further includes an auxiliary storage unit, and the auxiliary storage unit is connected to the auxiliary general control unit.
In the above technical solution, the auxiliary storage unit may be an 8G memory core circuit, and stores information data obtained by the auxiliary main control unit, and the specific circuit is shown in fig. 6.
As shown in fig. 1, the auxiliary communication display unit includes an auxiliary communication module and an auxiliary display unit, and both the auxiliary communication module and the auxiliary display unit are connected to the auxiliary general control unit.
In the above technical solution, the auxiliary communication module may include a 485 communication circuit and a network communication interface circuit; the 485 communication circuit can be as shown in fig. 3, and comprises a level conversion chip SN75LBC184, the chip converts the signal output by the master control unit into a 485 level signal, and a 4-bit connection terminal CON2 is also placed on the PCB board, which facilitates the connection of the connection terminal provided in the utility model; the network communication interface circuit may be as shown in fig. 4.
In the above technical solution, the display module is a prior art, and specifically, as shown in fig. 7, a circuit U6 driven by an LCD is a TTL to 232 level chip, and an L1-bit 120R magnetic bead can effectively suppress high-frequency interference, and meanwhile, the display module can adopt a 7-inch serial industrial touch screen, and the touch screen input circuit 232 outputs signals.
According to the requirement, the monitoring auxiliary machine further comprises an auxiliary machine insulating shell, the auxiliary machine main control unit, the auxiliary machine power supply unit and the auxiliary machine storage unit are arranged in the auxiliary machine insulating shell, and the auxiliary machine communication module and the auxiliary machine display unit are arranged on the auxiliary machine insulating shell.
According to the requirement, the monitoring auxiliary machine further comprises a line selection insulating shell, the line selection main control module, the current acquisition unit, the line selection storage unit and the line selection power supply unit are arranged in the line selection insulating shell, and the fault indication module and the line selection communication unit are arranged on the line selection insulating shell.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (10)
1. A data acquisition device for monitoring an unreliable ground fault is characterized by comprising a monitoring auxiliary machine and a plurality of line selection modules, wherein the monitoring auxiliary machine is respectively connected with the line selection modules; the monitoring auxiliary machine comprises an auxiliary machine main control unit, an auxiliary machine communication display unit and an auxiliary machine power supply unit, wherein the auxiliary machine main control unit is connected with the auxiliary machine communication display unit, and the auxiliary machine power supply unit supplies power for the monitoring auxiliary machine; the line selection module comprises a line selection master control unit, a current acquisition unit, a line selection communication unit and a line selection power supply unit, the line selection master control unit is respectively connected with the current acquisition unit and the line selection communication unit, the line selection communication unit is connected with the auxiliary machine communication display unit, and the line selection power supply unit supplies power for the line selection module.
2. The data collection device for unreliable ground fault monitoring according to claim 1, wherein the current collection unit comprises a first amplification circuit and a second amplification circuit, the first amplification circuit being connected to the second amplification circuit.
3. The data acquisition device for the unreliable ground fault monitoring according to claim 1 or 2, wherein the line selection master control unit comprises a line selection master control module, a line selection storage module and a fault indication module, and the line selection storage module and the fault indication module are both connected with the line selection master control unit.
4. The data acquisition device for the non-reliable ground fault monitoring according to claim 1 or 2, wherein the monitoring auxiliary machine further comprises an auxiliary machine storage unit, and the auxiliary machine storage unit is connected with the auxiliary machine master control unit.
5. The data acquisition device for unreliable ground fault monitoring according to claim 3, wherein the monitoring auxiliary machine further comprises an auxiliary machine storage unit, and the auxiliary machine storage unit is connected with the auxiliary machine master control unit.
6. The data acquisition device for the unreliable ground fault monitoring according to claim 1 or 2, wherein the auxiliary machine communication display unit comprises an auxiliary machine communication module and an auxiliary machine display unit, and the auxiliary machine communication module and the auxiliary machine display unit are both connected with the auxiliary machine master control unit.
7. The data acquisition device for unreliable ground fault monitoring according to claim 3, wherein the auxiliary communication display unit comprises an auxiliary communication module and an auxiliary display unit, and the auxiliary communication module and the auxiliary display unit are both connected with the auxiliary general control unit.
8. The data acquisition device for unreliable ground fault monitoring according to claim 4, wherein the auxiliary communication display unit comprises an auxiliary communication module and an auxiliary display unit, and the auxiliary communication module and the auxiliary display unit are both connected with the auxiliary general control unit.
9. The data acquisition device for unreliable ground fault monitoring according to claim 5, wherein the auxiliary communication display unit comprises an auxiliary communication module and an auxiliary display unit, and the auxiliary communication module and the auxiliary display unit are both connected with the auxiliary general control unit.
10. The data acquisition device for unreliable ground fault monitoring according to claim 9, wherein the monitoring auxiliary further comprises an auxiliary insulating housing, the auxiliary main control unit, the auxiliary power supply unit and the auxiliary storage unit are arranged in the auxiliary insulating housing, and the auxiliary communication module and the auxiliary display unit are arranged on the auxiliary insulating housing; and the monitoring auxiliary machine further comprises a line selection insulating shell, the line selection main control module, the current acquisition unit, the storage unit and the line selection power supply unit are arranged in the line selection insulating shell, and the fault indication module and the line selection communication unit are arranged on the line selection insulating shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120848867.8U CN215180777U (en) | 2021-04-23 | 2021-04-23 | Data acquisition device for unreliable ground fault monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120848867.8U CN215180777U (en) | 2021-04-23 | 2021-04-23 | Data acquisition device for unreliable ground fault monitoring |
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| Publication Number | Publication Date |
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| CN215180777U true CN215180777U (en) | 2021-12-14 |
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| CN202120848867.8U Active CN215180777U (en) | 2021-04-23 | 2021-04-23 | Data acquisition device for unreliable ground fault monitoring |
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| CN (1) | CN215180777U (en) |
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- 2021-04-23 CN CN202120848867.8U patent/CN215180777U/en active Active
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