CN211577310U - High-resistance grounding searching system for direct-current power supply - Google Patents
High-resistance grounding searching system for direct-current power supply Download PDFInfo
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- CN211577310U CN211577310U CN201922215895.1U CN201922215895U CN211577310U CN 211577310 U CN211577310 U CN 211577310U CN 201922215895 U CN201922215895 U CN 201922215895U CN 211577310 U CN211577310 U CN 211577310U
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Abstract
The utility model relates to an electric power detects technical field, more specifically relates to a DC power supply high resistance ground connection system of seeking, including signal generation unit, signal acquisition unit and fault detection unit, signal generation unit and direct current system be connected and to direct current system transmission low frequency signal, direct current system and signal acquisition unit be connected, signal acquisition unit and fault detection unit be connected, fault detection unit and signal generation unit be connected, can realize that ground connection does not receive the restriction of ground fault point distance, the direct current system of adaptable all kinds of complicacies.
Description
Technical Field
The utility model relates to an electric power detects technical field, more specifically relates to a system is seeked to DC power supply high resistance ground connection.
Background
With the continuous development of the power grid technology, the number of power transmission and supply equipment is continuously increased, the direct current system of the power supply is larger, the reliability and the safety requirement are higher and higher, and in long-term operation, due to the change of environment, climate, use conditions and the like, the problems of aging of cables, joints, equipment bodies and the like can occur, the system grounding phenomenon can be avoided, and the accidents of misoperation and refusal of relay protection and safety automatic devices can be easily caused.
The existing direct current system grounding searching technical method has many problems of misjudgment and missed judgment, is difficult to accurately position the position of a fault grounding point, and cannot realize real-time monitoring of direct current system grounding or loop faults.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides a DC power supply high resistance ground connection system of seeking, can realize that ground connection detection does not receive the restriction of earth fault point distance, the DC system of adaptable all kinds of complicacies.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a direct current power supply high resistance ground connection searching system, includes signal generation unit, signal acquisition unit and fault detection unit, signal generation unit and direct current system be connected and to direct current system transmission low frequency signal, direct current system be connected with signal acquisition unit, signal acquisition unit be connected with fault detection unit, fault detection unit be connected with signal generation unit.
In the device, when a ground fault or insulation reduction occurs in the direct current system, the signal generating unit sends a low-frequency signal which has no influence on the system to the direct current system to form signal output feedback, the direct current signal leakage current signals of the ground insulation of each loop are converted into signals which can be received by the fault detection unit through the direct current signal leakage current of the ground insulation of each loop detected by the signal acquisition unit, the insulation degree of the ground loop is converted and analog display is carried out through the fault detection unit, and the ground fault loop or branch and a fault point thereof are judged to be accurately positioned. The system can realize the purpose of monitoring fault point positioning by transmitting a 0.2HZ low-frequency signal to a direct current system and receiving a non-attenuated 0.2HZ signal by a receiver at a feeder line side. The system detects the direct current system by sending the low-frequency signal, can realize that the grounding detection is not limited by the distance of a grounding fault point, can adapt to various types of complex direct current systems, and can process the detection signal through the fault detection unit, thereby realizing the judgment and display of the direction of the grounding point and the rapid and accurate positioning of the positions of all the grounding points, realizing the monitoring of the grounding or loop faults of the direct current system, improving the maintenance and management level of the direct current system, avoiding the potential safety hazards of a power grid caused by adopting a conventional 'pulling method', realizing the rapid searching and positioning of high-resistance grounding faults of the direct current system, improving the operation reliability of the direct current power supply system, reducing the accident rate, reducing the operation and maintenance cost, improving the operation and maintenance efficiency, and greatly improving the safety and reliability of the power direct current power supply.
Furthermore, the signal generating unit comprises a signal generator, a first analog-to-digital conversion unit and a first signal amplifier which are electrically connected in sequence. The signal generator is far away by adopting an ultralow frequency signal, a direct current system is accessed when a ground fault or insulation reduction occurs, the signal generator transmits a low-frequency signal which is suitable for system detection and has no influence on the system to the positive bus, the negative bus and the ground of the direct current system 400 to form intelligent feedback of signal output, the low-frequency signal transmitted by the signal generator is subjected to digital-to-analog conversion through the first analog-to-digital conversion unit, and the signal is output to the direct current system through the first signal amplifier to realize ground fault detection on the direct current system through the signal.
Furthermore, the fault detection unit comprises a second signal amplifier, a second analog-to-digital conversion unit and a fault analysis unit which are electrically connected in sequence, the second signal amplifier is electrically connected with the signal acquisition unit, and the fault analysis unit is electrically connected with the signal generation unit. The second signal amplifier amplifies the received low-frequency signal, performs digital-to-analog conversion on the signal through the second analog-to-digital conversion unit, inputs the signal into the fault analysis unit to analyze the fault, and converts the direct-current signal leakage current signal of each circuit, which is insulated from the ground, into a signal which can be received by the fault detection unit. And by adopting a leakage current electromagnetic induction principle, converting the insulation degree of the grounding loop by the leakage current of the direct current signal of each loop, which is insulated from the ground, so as to realize the accurate positioning of the grounding fault loop and the fault point thereof.
Further, the fault analysis unit comprises a voltage stabilizing diode and an 8421 code analog calculator which are electrically connected in sequence. And monitoring a voltage analog signal threshold value and early warning to achieve the purpose of judging the accurate positioning of the ground fault loop and the fault point thereof.
Furthermore, the system also comprises a human-computer interaction unit, and the human-computer interaction unit is connected with the fault analysis unit. The analysis result of the fault analysis unit can be fed back to the human-computer interaction unit through the human-computer interaction unit, a worker can realize the functions of real-time detection and analog display through the human-computer interaction unit, the system can be controlled through the human-computer interaction unit, and meanwhile, the accuracy, reliability, rapidness and sensitivity of the system are considered.
Furthermore, the human-computer interaction unit is a remote terminal, and the remote terminal is in communication connection with the fault analysis unit.
Further, the remote terminal is a mobile phone, a tablet device or a computer.
Furthermore, the signal acquisition unit is a hall mutual inductor.
Compared with the prior art, the beneficial effects of the utility model are that: the device can realize that the grounding detection is not limited by the distance of a grounding fault point in a signal detection mode, and can be suitable for various complex direct current systems; the judgment and display of the directions of the grounding points are realized, and the positions of all the grounding points can be quickly and accurately positioned; the direct-current power supply system has the advantages that the real-time monitoring of the grounding or loop fault of the direct-current system is realized, the maintenance management level of the direct-current system is improved, the high-resistance grounding fault of the direct-current system is quickly searched and positioned, the operation reliability of the direct-current power supply system can be improved, the accident rate is reduced, the operation and maintenance cost is reduced, the operation and maintenance efficiency is improved, and the safety and reliability of the electric direct-current power supply are greatly improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Examples
As shown in fig. 1, a high-resistance ground searching system for a dc power supply includes a signal generating unit 100, a signal acquiring unit 200, and a fault detecting unit 300, where the signal generating unit 100 is connected to a dc system 400 and transmits a low-frequency signal to the dc system 400, the dc system 400 is connected to the signal acquiring unit 200, the signal acquiring unit 200 is connected to the fault detecting unit 300, and the fault detecting unit 300 is connected to the signal generating unit 100.
In this embodiment, the signal generating unit 100 includes a signal generator 103, a first analog-to-digital converting unit 102, and a first signal amplifier 101, which are electrically connected in sequence. The signal generator 103 is far away by adopting an ultra-low frequency signal, when a ground fault or insulation reduction occurs in the direct current system 400, the direct current system 400 is connected, the signal generator 103 transmits a low frequency signal which is suitable for system detection and has no influence on the system to the positive bus, the negative bus and the ground of the direct current system 400 to form intelligent feedback of signal output, the low frequency signal transmitted by the signal generator 103 is subjected to digital-to-analog conversion through the first analog-to-digital conversion unit 102, and the low frequency signal is output to the direct current system 400 through the first signal amplifier 101 to realize ground fault detection on the direct current system 400 through the signal.
In this embodiment, the fault detection unit 300 includes a second signal amplifier 301, a second analog-to-digital conversion unit 302, and a fault analysis unit 303 electrically connected in sequence, where the second signal amplifier 301 is electrically connected to the signal acquisition unit 200, and the fault analysis unit 303 is electrically connected to the signal generation unit 100. The second signal amplifier 301 amplifies the received low-frequency signal, performs digital-to-analog conversion on the signal through the second analog-to-digital conversion unit 302, inputs the signal into the fault analysis unit 303 to analyze the fault, and converts the dc signal leakage current signal of each circuit insulated from the ground into a signal that can be received by the fault detection unit 300. And by adopting a leakage current electromagnetic induction principle, converting the insulation degree of the grounding loop by the leakage current of the direct current signal of each loop, which is insulated from the ground, so as to realize accurate positioning of the branch circuit of the grounding fault loop and the fault point thereof.
In this embodiment, the fault analysis unit 303 is a CPU management chip for analyzing and processing data, and the CPU management chip performs comprehensive data analysis and processing to achieve the purpose of determining accurate positioning of the ground fault loop branch and the fault point thereof.
In this embodiment, the system further includes a human-computer interaction unit 304, and the human-computer interaction unit 304 is connected to the fault analysis unit 303. The analysis result of the fault analysis unit 303 can be fed back to the human-computer interaction unit 304 through the human-computer interaction unit 304, and a worker can realize the functions of real-time detection and analog display through the human-computer interaction unit 304, control the system through the human-computer interaction unit 304, and simultaneously give consideration to the accuracy, reliability, rapidity and sensitivity of the system.
In this embodiment, the human-computer interaction unit 304 is a remote terminal, and the remote terminal is in communication connection with the fault analysis unit 303.
In this embodiment, the remote terminal is a mobile phone, a tablet device or a computer.
In this embodiment, the signal acquisition unit 200 is a hall transformer.
In the device, when a ground fault or insulation reduction occurs in the dc system 400, the signal generating unit 100 sends a low-frequency signal having no influence on the system to the dc system 400 to form a signal output feedback, and converts the dc signal leakage current signal of each circuit with insulation to ground into a signal that can be received by the fault detecting unit 300 through the dc signal leakage current of each circuit with insulation to ground detected by the signal collecting unit 200, and performs ground circuit insulation degree conversion and analog display through the fault detecting unit 300 to determine that the ground fault circuit or branch circuit and the fault point thereof are accurately positioned. The system can realize the purpose of monitoring the fault point positioning by transmitting a 0.2HZ low-frequency signal to the direct current system 400 and receiving a non-attenuated 0.2HZ signal by a receiver on the feeder line side. The system can detect the direct current system 400 by sending low-frequency signals, can realize that the grounding detection is not limited by the distance of a grounding fault point, can adapt to various types of complex direct current systems 400, can process detection signals through the fault detection unit 300, thereby realizing the judgment and display of the direction of the grounding point and the rapid and accurate positioning of the positions of all the grounding points, realizing the monitoring of the grounding or loop faults of the direct current system 400, improving the maintenance and management level of the direct current system 400, avoiding the potential safety hazards of a power grid caused by adopting a conventional 'pulling method', realizing the rapid search and positioning of high-resistance grounding faults of the direct current system 400, improving the operation reliability, reducing the accident rate, reducing the operation and maintenance cost, improving the operation and maintenance efficiency and greatly improving the safety and reliability of a power direct current power supply, and realizing that the grounding detection is not limited by the distance of the grounding fault point, can adapt to various complex direct current systems 400; the judgment and display of the directions of the grounding points are realized, and the positions of all the grounding points can be quickly and accurately positioned; the direct-current system 400 grounding or loop fault real-time monitoring is realized, the maintenance management level of the direct-current system 400 is improved, the potential safety hazard of a power grid caused by a conventional 'pull method' is avoided, the high-resistance grounding fault of the direct-current system 400 is quickly searched and positioned, the direct-current power supply system can improve the operation reliability, reduce the accident rate, reduce the operation and maintenance cost, improve the operation and maintenance efficiency, and greatly improve the safety and reliability of the electric direct-current power supply.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides a direct current power supply high resistance ground searching system, characterized in that, including signal generation unit (100), signal acquisition unit (200) and fault detection unit (300), signal generation unit (100) be connected with direct current system (400) and to direct current system (400) transmission low frequency signal, direct current system (400) be connected with signal acquisition unit (200), signal acquisition unit (200) be connected with fault detection unit (300), fault detection unit (300) be connected with signal generation unit (100), signal generation unit (100) including signal generator (103), first analog-to-digital conversion unit (102) and first signal amplifier (101) that connect gradually the electricity.
2. The high-impedance grounding search system for the direct-current power supply according to claim 1, wherein the fault detection unit (300) comprises a second signal amplifier (301), a second analog-to-digital conversion unit (302) and a fault analysis unit (303) which are electrically connected in sequence, the second signal amplifier (301) is electrically connected with the signal acquisition unit (200), and the fault analysis unit (303) is electrically connected with the signal generation unit (100).
3. The high-impedance grounding search system for the direct-current power supply according to claim 2, wherein the fault analysis unit (303) comprises a zener diode and an 8421 code analog calculator which are electrically connected in sequence.
4. The high-impedance grounding search system for the direct-current power supply according to claim 2 or 3, further comprising a human-computer interaction unit (304), wherein the human-computer interaction unit (304) is connected with the fault analysis unit (303).
5. The high impedance grounding detection system for DC power supply according to claim 4, wherein said human-computer interaction unit (304) is a remote terminal, and said remote terminal is communicatively connected with said fault analysis unit (303).
6. The high impedance grounding lookup system for DC power supply of claim 5 wherein said remote terminal is a mobile phone, a tablet device or a computer.
7. The high-impedance grounding search system for the direct-current power supply according to claim 1, wherein the signal acquisition unit (200) is a hall transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215895.1U CN211577310U (en) | 2019-12-10 | 2019-12-10 | High-resistance grounding searching system for direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215895.1U CN211577310U (en) | 2019-12-10 | 2019-12-10 | High-resistance grounding searching system for direct-current power supply |
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| Publication Number | Publication Date |
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| CN211577310U true CN211577310U (en) | 2020-09-25 |
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| CN201922215895.1U Active CN211577310U (en) | 2019-12-10 | 2019-12-10 | High-resistance grounding searching system for direct-current power supply |
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