CN108196167B - Small current fault line selection system based on piezoelectric ceramic voltage acquisition - Google Patents
Small current fault line selection system based on piezoelectric ceramic voltage acquisition Download PDFInfo
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- CN108196167B CN108196167B CN201810189247.0A CN201810189247A CN108196167B CN 108196167 B CN108196167 B CN 108196167B CN 201810189247 A CN201810189247 A CN 201810189247A CN 108196167 B CN108196167 B CN 108196167B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 74
- 239000004020 conductor Substances 0.000 claims abstract description 58
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
本发明提供一种基于压电陶瓷电压采集的小电流故障选线系统，包括：电力线缆、零序电流互感器、架空导线、压电陶瓷式电压互感器、波形记录仪、小电流故障选线装置以及处理器；通过压电陶瓷式电压互感器采集线路相对地电压，零序电流互感器采集线路故障时线路零序电流，当线路零序电流或线路相对地电压的跃变超过波形记录仪的触发值时，可通过波形记录仪记录电压、电流波形，并将记录的电流、电压波形数据传输至处理器，便于处理器根据上述电流、电压波形来判断故障类型，进而将故障线路信号传输至小电流故障选线装置，能够为故障线路的准确分析提供包括线路零序电流、线路相对地电压在内的充足的数据支持，可作为小电流选线装置选线的辅助手段。
The present invention provides a small current fault line selection system based on piezoelectric ceramic voltage acquisition, comprising: a power cable, a zero-sequence current transformer, an overhead conductor, a piezoelectric ceramic voltage transformer, a waveform recorder, a small current fault line selection device and a processor; the line relative ground voltage is acquired by the piezoelectric ceramic voltage transformer, and the line zero-sequence current transformer acquires the line zero-sequence current when the line fails; when the jump of the line zero-sequence current or the line relative ground voltage exceeds the trigger value of the waveform recorder, the voltage and current waveforms can be recorded by the waveform recorder, and the recorded current and voltage waveform data can be transmitted to the processor, so that the processor can judge the fault type according to the above current and voltage waveforms, and then transmit the fault line signal to the small current fault line selection device, which can provide sufficient data support including the line zero-sequence current and the line relative ground voltage for accurate analysis of the fault line, and can be used as an auxiliary means for line selection of the small current line selection device.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a small-current fault line selection system based on piezoelectric ceramic voltage acquisition.
Background
The 10kV and 35kV distribution lines are used as the power sources of the tail end of the power grid and the power consumers, and the reliable and stable operation of the 10kV and 35kV distribution lines is crucial to the power supply reliability of the power grid and the production of the power consumers. When a single-phase earth fault occurs in a distribution line, the line with the fault needs to be accurately determined, and the line with the fault is cut off in emergency and corresponding safety measures are taken to avoid further aggravation of the fault.
In the prior art, low current fault line selection devices are typically employed to determine a faulty line. The small-current fault line selection device is a monitoring device which is arranged in a transformer substation and is used for judging line faults when a distribution line is in single-phase grounding. Currently, small current fault line selection devices in the market generally determine a fault line by utilizing the characteristics that zero sequence current of the fault line flows from a line to a bus, zero sequence current of a non-fault line flows from the bus to the line, the directions of the two are opposite, and the zero sequence current of the fault line lags behind the zero sequence voltage by 90 degrees.
In practice, however, because the zero-sequence current generated when the distribution line is in single-phase grounding is the system capacitance current and the value is very small, the detection method based on the zero-sequence current and the zero-sequence voltage is low in sensitivity, in addition, the fault line is difficult to accurately judge only by means of the zero-sequence current and the zero-sequence voltage, and the misjudgment caused by a single criterion can be reduced only by combining the multi-aspect data of the distribution line and complementing the advantages of multiple criteria. Therefore, the existing low-current fault line selection device cannot provide sufficient data support for accurate analysis of a fault line.
Disclosure of Invention
The invention aims to provide a small-current fault line selection system based on piezoelectric ceramic voltage acquisition, which aims to solve the problem that the existing small-current fault line selection device cannot provide sufficient data support for accurate analysis of a fault line.
The invention provides a small-current fault line selection system based on piezoelectric ceramic voltage acquisition, which comprises the following steps:
The system comprises a power cable, a zero sequence current transformer, an overhead conductor, a piezoelectric ceramic voltage transformer, a waveform recorder, a small current fault line selection device and a processor;
The power cable comprises an A-phase bus, a B-phase bus and a C-phase bus, wherein the overhead conductor comprises a first overhead conductor connected with the A-phase bus, a second overhead conductor connected with the B-phase bus and a third overhead conductor connected with the C-phase bus;
The phase A bus, the phase B bus and the phase C bus form a three-core cable, the zero sequence current transformer is sleeved on the periphery of the three-core cable, and the zero sequence current transformer is connected with the waveform recorder;
the top of the first piezoelectric ceramic voltage transformer is connected with the first overhead conductor, the bottom of the first piezoelectric ceramic voltage transformer is led out of a voltage tap, the top of the second piezoelectric ceramic voltage transformer is connected with the second overhead conductor, the bottom of the second piezoelectric ceramic voltage transformer is led out of a voltage tap, the top of the third piezoelectric ceramic voltage transformer is connected with the third overhead conductor, and the bottom of the third piezoelectric ceramic voltage transformer is led out of a voltage tap;
The waveform recorder is connected with the processor, and the processor is connected with the small-current fault line selection device.
Optionally, the power cable further comprises a ground wire, wherein the ground wire is located at one side of the three-core cable, and the ground wire penetrates through the zero-sequence current transformer.
Optionally, the zero sequence current transformer is connected with the waveform recorder through an insulated wire.
Optionally, the voltage level of the insulated wire is 0.6-1 KV.
Optionally, the voltage taps of the second piezoelectric ceramic voltage transformer and the third piezoelectric ceramic voltage transformer are connected with the waveform recorder through coaxial cables respectively.
According to the technical scheme, the small-current fault line selection system based on the piezoelectric ceramic voltage acquisition comprises a power cable, a zero-sequence current transformer, an overhead conductor, the piezoelectric ceramic voltage transformer, a waveform recorder, a small-current fault line selection device and a processor, wherein the piezoelectric ceramic voltage transformer is used for acquiring the line relative ground voltage, the zero-sequence current transformer is used for acquiring the line zero-sequence current when the line zero-sequence current or the line relative ground voltage jump exceeds the trigger value of the waveform recorder, the waveform recorder is used for recording the voltage and the current waveform, and transmitting recorded current and voltage waveform data to the processor, so that the processor can conveniently judge fault types according to the current and voltage waveforms and then transmit fault line signals to the small-current fault line selection device.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a small-current fault line selection system based on piezoelectric ceramic voltage acquisition.
Fig. 2 is a schematic installation diagram of a zero sequence current transformer of a small current fault line selection system based on piezoelectric ceramic voltage acquisition.
The illustration is 1-power cable, 2-zero sequence current transformer, 3-overhead conductor, 4-piezoceramic voltage transformer, 5-insulated conductor, 6-waveform recorder, 7-coaxial cable, 8-small current fault line selection device, 9-processor, 10-three-core cable, 11-A phase bus, 12-B phase bus, 13-C phase bus, 14-ground wire, 31-first overhead conductor, 32-second overhead conductor, 33-third overhead conductor, 41-first piezoceramic voltage transformer, 42-second piezoceramic voltage transformer, 43-third piezoceramic voltage transformer.
Detailed Description
Referring to fig. 1 to 2, an embodiment of the present invention provides a low-current fault line selection system based on piezoelectric ceramic voltage acquisition, which includes a power cable 1, a zero-sequence current transformer 2, an overhead conductor 3, a piezoelectric ceramic voltage transformer 4, a waveform recorder 6, a low-current fault line selection device 8 and a processor 9.
The power cable 1 includes an a-phase bus 11, a B-phase bus 12, and a C-phase bus 13, and in this embodiment, the power cable 1 is a three-phase four-wire power transmission line. The overhead conductor 3 comprises a first overhead conductor 31 connected to the a-phase bus 11, a second overhead conductor 32 connected to the B-phase bus 12, and a third overhead conductor 33 connected to the C-phase bus 13.
The piezoelectric ceramic voltage transformer 4 includes a first piezoelectric ceramic voltage transformer 41, a second piezoelectric ceramic voltage transformer 42, and a third piezoelectric ceramic voltage transformer 43. The first, second and third piezoelectric ceramic voltage transformers 41, 42 and 43 may be replaced by other voltage transformers. Compared with other types of transformers, the piezoelectric ceramic voltage transformer is lower in cost, convenient to put into operation and convenient to install, and only one post insulator is added during installation.
The phase A bus 11, the phase B bus 12 and the phase C bus 13 form a three-core cable 10, the zero sequence current transformer 2 is sleeved on the periphery of the three-core cable 10, and the zero sequence current transformer 2 is connected with the waveform recorder 6. In this embodiment, the zero sequence current transformer 2 may be clamped to the lower part of the cable head of the three-core cable 10 when the zero sequence current transformer 2 is installed. In addition, the power cable 1 further comprises a grounding wire 14, the grounding wire 14 is located on one side of the three-core cable 10, the grounding wire 14 penetrates through the zero sequence current transformer 2, wherein the zero sequence current transformer 2 is connected with the waveform recorder 6 through an insulated wire 5 and used for transmitting zero sequence current data collected by the zero sequence current transformer 2 to the waveform recorder 6 for recording.
Because the zero sequence current of the fault line is equal to the sum of the zero sequence currents of all non-fault lines, the zero sequence current direction of the fault line is opposite to the zero sequence current direction of the non-fault line, and therefore the zero sequence current data collected by the zero sequence current transformer 2 can be used for fault judgment according to the current direction so as to judge whether the fault is the line fault. In this embodiment, the insulated wire 5 is a low-voltage insulated wire, and the voltage level is 0.6-1 kv.
Specifically, the top of the first piezoceramic voltage transformer 41 is connected with the first overhead conductor 31, and a voltage tap is led out from the bottom of the first piezoceramic voltage transformer for collecting the relative ground voltage of the first overhead conductor 31. The top of the second piezoelectric ceramic voltage transformer 42 is connected to the second overhead conductor 32, and a voltage tap is led out from the bottom thereof, so as to collect the relative ground voltage of the second overhead conductor 32. The top of the third piezoelectric ceramic voltage transformer 43 is connected with the third overhead conductor 33, and a voltage tap is led out from the bottom of the third piezoelectric ceramic voltage transformer for collecting the relative ground voltage of the third overhead conductor 33. In this embodiment, the first, second and third piezoceramic voltage transformers 41, 42 and 43 can continuously collect the relative voltages of the first, second and third overhead conductors 31, 32 and 33, respectively.
The voltage taps of the first piezoelectric ceramic voltage transformer 41, the second piezoelectric ceramic voltage transformer 42 and the third piezoelectric ceramic voltage transformer 43 are respectively connected with the waveform recorder 6, so as to transmit the relative ground voltage data of the first overhead conductor 31, the second overhead conductor 32 and the third overhead conductor 33 to the waveform recorder 6 for recording. In this embodiment, the voltage taps of the second piezoelectric ceramic voltage transformer 42 and the third piezoelectric ceramic voltage transformer 43 are connected to the waveform recorder 6 through coaxial cables 7, respectively.
Further, the waveform recorder 6 is connected with the processor 9, and the processor 9 is connected with the small current fault line selection device 8. The waveform recorder 6 may transmit the recorded relative ground voltage data of the first overhead conductor 31, the second overhead conductor 32 and the third overhead conductor 33, and the zero sequence current data collected by the zero sequence current transformer 2 to the processor 9, so that the processor 9 may determine the fault type according to the current and voltage waveforms, and then transmit the fault line signal to the low current fault line selection device 8.
It should be emphasized that the present application relates to providing sufficient data support including zero sequence current of the line and relative ground voltage of the line to the processor 9 for accurate analysis of the fault line by a new hardware architecture, and the technical problem to be solved by the present application is also limited to solving the problem that the existing hardware architecture cannot provide sufficient data support for accurate analysis of the fault line by the connection relationship of the hardware architecture of the system, and does not relate to improvement of the program of the processor 9, i.e. the present application solves the technical problem without using software program of the processor 9.
In this embodiment, the waveform recorder 6 is in a standby state during normal operation of the line, if the relative ground voltage data of the first overhead conductor 31, the second overhead conductor 32 and the third overhead conductor 33, and the jump of the zero sequence current data collected by the zero sequence current transformer 2 exceed the trigger value of the waveform recorder 6 when the line fails, the waveform recorder 6 starts and synchronously records the relative ground voltage waveforms of the first overhead conductor 31, the second overhead conductor 32 and the third overhead conductor 33, and the zero sequence current waveform collected by the zero sequence current transformer 2. Furthermore, the waveform recorder 6 can be triggered manually to record the relative ground voltage waveforms of the first overhead conductor 31, the second overhead conductor 32 and the third overhead conductor 33, and the zero sequence current waveform collected by the zero sequence current transformer 2. The above-described functions of the waveform recorder 6 can be implemented according to the prior art.
When the small-current fault line selection system based on piezoelectric ceramic voltage acquisition is installed on site, the zero-sequence current transformer 2 can be clamped at the lower part of the cable head of the three-core cable 10, so that the A-phase bus 11, the B-phase bus 12 and the C-phase bus 13 pass through the zero-sequence current transformer 2, and the grounding wire 14 also passes through the zero-sequence current transformer 2. The zero sequence current transformer 2 is then connected to the waveform recorder 6. Then, the first piezoelectric ceramic voltage transformer 41, the second piezoelectric ceramic voltage transformer 42 and the third piezoelectric ceramic voltage transformer 43 are respectively mounted on the first overhead wire 31, the second overhead wire 32 and the third overhead wire 33 to collect the relative ground voltage of the line, and the first piezoelectric ceramic voltage transformer 41, the second piezoelectric ceramic voltage transformer 42 and the third piezoelectric ceramic voltage transformer 43 are connected to the waveform recorder 6 through the coaxial cable 7, and finally the waveform recorder 6 and the processor 9 are connected through the data line.
According to the technical scheme, the small-current fault line selection system based on piezoelectric ceramic voltage acquisition provided by the embodiment of the invention comprises a power cable 1, a zero-sequence current transformer 2, an overhead conductor 3, a piezoelectric ceramic voltage transformer 4, a waveform recorder 6, a small-current fault line selection device 8 and a processor 9. The power cable 1 comprises an a-phase bus 11, a B-phase bus 12 and a C-phase bus 13, the overhead conductor 3 comprises a first overhead conductor 31 connected with the a-phase bus 11, a second overhead conductor 32 connected with the B-phase bus 12 and a third overhead conductor 33 connected with the C-phase bus 13, and the piezoceramic voltage transformer 4 comprises a first piezoceramic voltage transformer 41, a second piezoceramic voltage transformer 42 and a third piezoceramic voltage transformer 43. The three-core cable 10 is formed by an A-phase bus 11, a B-phase bus 12 and a C-phase bus 13, a zero sequence current transformer 2 is sleeved on the periphery of the three-core cable 10, the zero sequence current transformer 2 is connected with a waveform recorder 6, the top of a first piezoelectric ceramic voltage transformer 41 is connected with a first overhead conductor 31, a voltage tap is led out from the bottom, the top of a second piezoelectric ceramic voltage transformer 42 is connected with a second overhead conductor 32, a voltage tap is led out from the bottom, the top of a third piezoelectric ceramic voltage transformer 43 is connected with a third overhead conductor 33, the voltage taps of the first piezoelectric ceramic voltage transformer 41, the second piezoelectric ceramic voltage transformer 42 and the third piezoelectric ceramic voltage transformer 43 are respectively connected with the waveform recorder 6, a small-current fault line selection system based on piezoelectric ceramic voltage acquisition is provided by the embodiment of the invention, line phase-to-ground voltage is acquired through the piezoelectric ceramic voltage transformer 4, when the line fault is acquired by the zero sequence current transformer 2, the line current or the change of the line-to-ground voltage exceeds the trigger value of the waveform recorder 6, the voltage is able to be accurately transmitted to the small-current fault line through the waveform recorder 6, the small-phase fault line is accurately transmitted to the waveform recorder based on the voltage signal transmission line, and the small-fault signal is accurately determined by the small-phase fault line fault detection means, and the small-fault signal is provided by the waveform recorder based on the waveform recorder and the waveform fault signal is provided, by combining the multiple aspects of data of the distribution line, the advantages of multiple criteria are complemented, so that misjudgment caused by a single criterion is reduced.
The above embodiments of the present invention do not limit the scope of the present invention.
Claims (4)
1. A small current fault line selection system based on piezoelectric ceramic voltage acquisition is characterized by comprising:
The system comprises a power cable (1), a zero sequence current transformer (2), an overhead conductor (3), a piezoelectric ceramic voltage transformer (4), a waveform recorder (6), a small current fault line selection device (8) and a processor (9);
The power cable (1) comprises an A-phase bus (11), a B-phase bus (12) and a C-phase bus (13), wherein the overhead conductor (3) comprises a first overhead conductor (31) connected with the A-phase bus (11), a second overhead conductor (32) connected with the B-phase bus (12) and a third overhead conductor (33) connected with the C-phase bus (13), and the piezoelectric ceramic voltage transformer (4) comprises a first piezoelectric ceramic voltage transformer (41), a second piezoelectric ceramic voltage transformer (42) and a third piezoelectric ceramic voltage transformer (43);
The phase A bus (11), the phase B bus (12) and the phase C bus (13) form a three-core cable (10), the zero sequence current transformer (2) is sleeved on the periphery of the three-core cable (10), and the zero sequence current transformer (2) is connected with the waveform recorder (6);
The top of the first piezoelectric ceramic voltage transformer (41) is connected with the first overhead conductor (31), the bottom of the first piezoelectric ceramic voltage transformer is led out of a voltage tap, the top of the second piezoelectric ceramic voltage transformer (42) is connected with the second overhead conductor (32), the bottom of the second piezoelectric ceramic voltage transformer is led out of a voltage tap, the top of the third piezoelectric ceramic voltage transformer (43) is connected with the third overhead conductor (33), and the bottom of the third piezoelectric ceramic voltage transformer is led out of a voltage tap, and the voltage taps of the first piezoelectric ceramic voltage transformer (41), the second piezoelectric ceramic voltage transformer (42) and the third piezoelectric ceramic voltage transformer (43) are respectively connected with the waveform recorder (6);
The waveform recorder (6) is connected with the processor (9), and the processor (9) is connected with the small current fault line selection device (8);
the voltage taps of the second piezoelectric ceramic voltage transformer (42) and the third piezoelectric ceramic voltage transformer (43) are respectively connected with the waveform recorder (6) through coaxial cables (7).
2. The low-current fault line selection system based on piezoceramic voltage acquisition according to claim 1, characterized in that the power cable (1) further comprises a ground line (14), the ground line (14) is located at one side of the three-core cable (10), and the ground line (14) passes through the zero-sequence current transformer (2).
3. The small-current fault line selection system based on piezoelectric ceramic voltage acquisition according to claim 1, wherein the zero-sequence current transformer (2) is connected with the waveform recorder (6) through an insulated wire (5).
4. A low current fault line selection system based on piezoelectric ceramic voltage collection according to claim 3, characterized in that the voltage class of the insulated wire (5) is 0.6-1 kv.
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| CN201810189247.0A CN108196167B (en) | 2018-03-08 | 2018-03-08 | Small current fault line selection system based on piezoelectric ceramic voltage acquisition |
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| CN104375056B (en) * | 2014-10-31 | 2017-04-12 | 国家电网公司 | Substation cable outgoing line fault monitoring method based on voltage and current initial row waves |
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| CN103424671A (en) * | 2013-09-03 | 2013-12-04 | 刘天明 | Low-current grounding fault manual discrimination line selection system of power system |
| CN107561414A (en) * | 2017-10-31 | 2018-01-09 | 国家电网公司 | Rapidly find out the selection method and wire selection system in single-phase grounded malfunction in grounded system of low current loop |
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