CN210604850U - Single-phase earth fault line selection test system of distribution network - Google Patents
Single-phase earth fault line selection test system of distribution network Download PDFInfo
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- CN210604850U CN210604850U CN201921330964.7U CN201921330964U CN210604850U CN 210604850 U CN210604850 U CN 210604850U CN 201921330964 U CN201921330964 U CN 201921330964U CN 210604850 U CN210604850 U CN 210604850U
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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
The utility model discloses a distribution network single-phase earth fault route selection test system, including fault simulation system, IO interface module is connected to fault simulation system's output, and IO interface module connects the input of DSP fault route selection module, and the host computer is connected to the output of DSP fault route selection module, and DSP fault route selection module passes through the electric wire netting real-time data that fault simulation system gathered, differentiates out the trouble circuit, transmits the host computer. The utility model discloses a device which can simulate different power distribution network system fault working conditions, including different fault positions, different transition resistances and the like; the DSP fault line selection module has small volume and is convenient to debug; the line selection device can rapidly process fault data, send out alarm information and display the serial number of a fault line.
Description
Technical Field
The utility model belongs to the technical field of power system earth fault route selection equipment, concretely relates to single-phase earth fault route selection test system of distribution network.
Background
In a medium-low voltage distribution network in China, a neutral point of a power system of the medium-low voltage distribution network generally adopts a non-effective grounding mode. With the increasing development of the power industry, distribution networks show a diversified trend, more cable lines are applied to the distribution networks, the capacitive current of the ground fault is greatly increased, the neutral point can be effectively extinguished through an arc suppression coil grounding mode, the grounding residual current is reduced, the distribution system can operate for 1-2 hours with faults, and the improvement of power supply reliability is facilitated, so that the neutral point is widely applied to medium-voltage distribution networks through the arc suppression coil grounding mode. However, if the fault is not detected and handled in time, the fault is easily expanded to an inter-phase short circuit or a two-point and multi-point ground fault by long-time operation with the fault, and the phase voltage of the non-fault phase in the line is increased to the line voltage and changed to the original line voltage
And the resonance overvoltage of the distribution network is easily caused, the system insulation equipment is damaged, and large-area power failure is caused. Therefore, the device for selecting the fault line of the power distribution network is researched, and the device is beneficial to timely distinguishing the fault line from the non-fault line and carrying out fault processing so as to provide reliable guarantee for the safe operation of the power distribution network.
Initial ground fault studies were mostly directed to the distribution network of a system with no ground neutral; according to the fault phenomenon when grounding: the zero sequence current at the head end of the grounding circuit is approximate to the sum of the capacitance current to ground of the non-grounding circuit, and the zero sequence current at the non-grounding head end is the capacitance current to ground of the circuit; the zero sequence current direction of the first end of the grounding circuit is opposite to that of the non-grounding first end, the zero sequence current direction of the first end of the grounding circuit is pointed to a bus by the circuit, and the bus is pointed to the circuit in the zero sequence current direction of the non-grounding first end. According to the principle, the line selection device of the zero-sequence current amplitude method, the zero-sequence current phase comparison method and the zero-sequence current group amplitude comparison phase method is applied, and good effects are achieved.
Along with the popularization and application of the arc suppression coil, the inductance current of the arc suppression coil basically compensates the ground capacitance current of the power grid: the zero sequence current at the head end of the grounding circuit is approximate to the sum of the capacitance current to ground of the non-grounding circuit, and the zero sequence current at the non-grounding head end is the capacitance current to ground of the circuit; the zero sequence current direction of the head end of the grounding circuit is opposite to that of the non-grounding head end, the zero sequence current direction of the head end of the grounding circuit is directed to a bus by the circuit, the inherent phenomenon that the bus is directed to the circuit in the zero sequence current direction of the non-grounding head end disappears, and a line selection device of the transient analysis technology is generated along with the line selection device, so that a certain positive effect is generated. But have limited utility for overhead outlet distribution networks. Therefore, in order to verify the correctness of some line selection principles, a power distribution network single-phase earth fault line selection test system needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a distribution network single-phase earth fault route selection test system can verify the exactness of current route selection method and solve the problem that is difficult to the limitation of simulation in actual engineering.
The utility model provides a technical scheme be, a distribution network single-phase earth fault route selection test system, including the fault simulation system, IO interface module is connected to the output of fault simulation system, and IO interface module connects the input of DSP fault route selection module, and the host computer is connected to the output of DSP fault route selection module, and DSP fault route selection module passes through the electric wire netting real-time data that the fault simulation system gathered, differentiates out the trouble circuit, transmits the host computer.
Yet another feature of the present invention is that,
the fault simulation system is used for simulating different power distribution network systems.
The DSP fault line selection module comprises an A/D conversion module, the input end of the A/D conversion module is connected with the output end of the I/O interface module, the output end of the A/D conversion module is respectively connected with the memory and the input end of the microprocessor, and the output end of the microprocessor is connected with the alarm module and the fault line display module.
The alarm module comprises a buzzer and an LED lamp and is used for sending out alarm notification when a line fails.
The fault line display module comprises a nixie tube and is used for displaying the line number with the fault.
The upper computer is used for calling data of the memory in real time.
The upper computer is connected with the DSP fault line selection module through a USB interface.
The upper computer comprises a current voltage waveform display module and a current voltage amplitude display module, and the current voltage waveform display module and the current voltage amplitude display module are respectively used for displaying the voltage current waveform and the amplitude in the power distribution network.
The utility model has the advantages that the single-phase earth fault line selection test system of the power distribution network can conveniently simulate different fault working conditions of the power distribution network system, including different fault positions, different transition resistances and the like; the DSP fault line selection module has small volume and is convenient to debug; the line selection device can rapidly process fault data, send out alarm information and display the serial number of a fault line; and the upper computer interface can intuitively and reliably reflect the current voltage waveform and the current voltage amplitude of each line.
Drawings
Fig. 1 is a schematic structural diagram of a single-phase earth fault line selection test system of a power distribution network according to the present invention;
fig. 2 is a circuit connection diagram of a DSP fault line selection module in a single-phase earth fault line selection test system of the utility model;
fig. 3 is a schematic diagram of an internal structure of an upper computer in the single-phase earth fault line selection test system of the power distribution network of the present invention;
fig. 4 is a schematic structural diagram in an embodiment of the present invention.
In the figure, 1, a fault simulation system, 2, an I/O interface module, 3, a DSP fault line selection module, 4, an upper computer, 5, an A/D conversion module, 6, a microprocessor, 7, an alarm module, 8, a fault line display module, 9, a memory, 10, a current and voltage waveform display module and 11, a current and voltage amplitude display module.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses a distribution network single-phase earth fault route selection test system, as shown in figure 1, including fault simulation system 1, IO interface module 2 is connected to fault simulation system 1's output, and IO interface module 2 connects DSP fault route selection module 3's input, and DSP fault route selection module 3's output connects host computer 4, and DSP fault route selection module 3 passes through the electric wire netting real-time data that fault simulation system 1 gathered, differentiates the fault line, transmits host computer 4.
The fault simulation system 1 is used for simulating different power distribution network systems, is a source of fault data of a single-phase grounding test system of the power distribution network, can simulate operation conditions of different fault types, can set the fault types to be metallic grounding and grounding through different resistors, can also set initial phase angles when faults occur, and basically simulates fault conditions which can occur under actual conditions.
As shown in fig. 2, the DSP fault line selection module 3 adopts a DSP chip F28335, and includes an a/D conversion module 5, an input end of the a/D conversion module 5 is connected with an output end of the I/O interface module 2, an output end of the a/D conversion module 5 is respectively connected with an input end of the memory 9 and an input end of the microprocessor 6, and an output end of the microprocessor 6 is connected with the alarm module 7 and the fault line display module 8.
The DSP fault line selection module is connected with the power distribution network modeling fault simulation system 1 through an I/O interface, the module has the functions of warning notification and fault line number display, the microprocessor is a TMS320F28335 type microprocessor, fault data can be judged through writing in the existing data processing method, and the judgment result can be informed to a tester to be processed through various forms of sound, light and information.
The alarm module 7 is a buzzer and an LED lamp and is used for giving an alarm notice when a line fails.
The fault line display module 8 adopts a nixie tube and is used for displaying the line number with the fault.
The upper computer 4 is used for calling data of the memory 9 in real time.
The upper computer 4 is connected with the DSP fault line selection module 3 through a USB interface.
As shown in fig. 3, the upper computer 4 includes a current-voltage waveform display module 10 and a current-voltage amplitude display module 11.
The current voltage waveform display module 10 and the current voltage amplitude display module 11 are respectively used for displaying the voltage current waveform and the amplitude in the power distribution network.
The fault simulation system 1 is used for simulating different power distribution network systems; the I/O interface module is used for connecting the fault simulation system 1 and the DSP fault line selection module 3; the DSP fault line selection module 3 is used for calculating and judging fault lines; the upper computer 4 is used for displaying the voltage and the current of each outgoing line in real time.
Examples
The utility model discloses a distribution network single-phase earth fault route selection test system concrete working process as follows: as shown in fig. 4, the fault simulation system 1 simulates the operation conditions of different fault types of a 10kV power distribution network system, including different fault positions, different transition resistances, etc., and simulates the single-phase earth fault occurring under the actual condition, the single-phase fault is simulated in the 10kV power distribution network system to generate fault data, the fault simulation system 1 is connected with the DSP fault line selection module 3 through the I/O interface, the analog signal is converted into the digital signal through the a/D conversion module 5 and is issued to the microprocessor 6, the fault line is calculated and judged in the DSP chip F28335, the processing result is informed of an alarm through the buzzer and the LED lamp of the alarm module 7, and the serial number of the fault line is displayed in the fault line display module 8. The upper computer 4 is connected with the DSP fault line selection module 3 through a USB interface, calls fault data in the memory 9, displays waveforms in the current and voltage waveform display module 10, calculates effective values through the upper computer 4, and displays amplitudes in the current and voltage amplitude display module 11. The tester can complete and optimize the fault line selection scheme according to the analysis result, and the fault line selection scheme is applied to subsequent engineering of the researched line selection scheme.
Claims (8)
1. The single-phase earth fault line selection testing system of the power distribution network is characterized by comprising a fault simulation system (1), wherein an output end of the fault simulation system (1) is connected with an I/O interface module (2), the I/O interface module (2) is connected with an input end of a DSP fault line selection module (3), an output end of the DSP fault line selection module (3) is connected with an upper computer (4), and the DSP fault line selection module (3) judges a fault line through real-time data of the power grid collected by the fault simulation system (1) and transmits the fault line to the upper computer (4).
2. A single-phase earth fault line selection test system for a power distribution network as claimed in claim 1, characterized in that the fault simulation system (1) is arranged to simulate different power distribution network systems.
3. The power distribution network single-phase earth fault line selection test system of claim 1, characterized in that the DSP fault line selection module (3) comprises an a/D conversion module (5), an input end of the a/D conversion module (5) is connected with an output end of the I/O interface module (2), an output end of the a/D conversion module (5) is respectively connected with an input end of a memory (9) and an input end of a microprocessor (6), and an output end of the microprocessor (6) is connected with an alarm module (7) and a fault line display module (8).
4. A single-phase earth fault line selection test system for a power distribution network as claimed in claim 3, characterized in that said alarm module (7) comprises a buzzer and an LED lamp for giving an alarm notification in case of line fault.
5.A single-phase earth fault line selection test system for a power distribution network as claimed in claim 3, characterized in that said fault line display module (8) comprises a nixie tube for displaying the number of the faulted line.
6. The single-phase earth fault line selection test system of the power distribution network according to claim 3, characterized in that the upper computer (4) is used for calling data of the memory (9) in real time.
7. The single-phase earth fault line selection test system of the power distribution network according to claim 1, characterized in that the upper computer (4) is connected with the DSP fault line selection module (3) through a USB interface.
8. The single-phase earth fault line selection test system of the power distribution network according to claim 1, wherein the upper computer (4) comprises a current voltage waveform display module (10) and a current voltage amplitude display module (11), and the current voltage waveform display module (10) and the current voltage amplitude display module (11) are respectively used for displaying the voltage current waveform and the amplitude in the power distribution network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921330964.7U CN210604850U (en) | 2019-08-15 | 2019-08-15 | Single-phase earth fault line selection test system of distribution network |
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| CN201921330964.7U CN210604850U (en) | 2019-08-15 | 2019-08-15 | Single-phase earth fault line selection test system of distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098777A (en) * | 2020-09-22 | 2020-12-18 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Multi-source heterogeneous power distribution network fault simulation process and method based on RTDS |
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- 2019-08-15 CN CN201921330964.7U patent/CN210604850U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098777A (en) * | 2020-09-22 | 2020-12-18 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Multi-source heterogeneous power distribution network fault simulation process and method based on RTDS |
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