CN113176471A - Distribution lines fault detection system - Google Patents
Distribution lines fault detection system Download PDFInfo
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- CN113176471A CN113176471A CN202110372443.3A CN202110372443A CN113176471A CN 113176471 A CN113176471 A CN 113176471A CN 202110372443 A CN202110372443 A CN 202110372443A CN 113176471 A CN113176471 A CN 113176471A
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 15
- 230000003750 conditioning effect Effects 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims description 12
- 230000000007 visual effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a power distribution line fault detection system which comprises a signal acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit, a communication unit and a circuit breaker control instruction output unit, wherein the signal acquisition unit is used for acquiring a signal; the distribution line fault detection system analyzes and judges whether a ground fault occurs according to the voltage signals collected by the signal collection unit, judges whether the circuit breaker carries out reclosing operation according to different conditions, and uploads fault information to a remote monitoring center through the communication unit. The invention provides a distribution line fault detection system which can judge the working condition of a distribution line according to the fault condition and improve the safety and reliability of the distribution line.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a distribution line fault detection system.
Background
At present, the distribution network in China mainly adopts a mode that a neutral point is not directly connected, the tripping times of the distribution network can be reduced, and the power supply reliability is further improved. When a single-phase earth fault occurs in a non-direct power distribution network, although the single-phase earth fault cannot be immediately tripped, the safety operation of the power distribution network is threatened, a fault line needs to be determined and cut as soon as possible, and if the fault cannot be eliminated within a specified time, a power supply needs to be cut off to ensure the safety and reliability of the power distribution line.
The invention provides a distribution line fault detection system, which is used for determining whether a breaker is reclosed according to the difference between a voltage signal of an incoming line reactor and a voltage signal of a neutral point small reactor, so that the safety and the efficiency of the system are improved.
Disclosure of Invention
The invention provides a distribution line fault detection system which can judge the working condition of a distribution line according to the fault condition and improve the safety and reliability of the distribution line.
The invention particularly relates to a distribution line fault detection system which comprises a signal acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit, a communication unit and a circuit breaker control instruction output unit, wherein the signal acquisition unit is sequentially connected with the signal conditioning unit and the control processing unit, and the control processing unit is also respectively connected with the display unit, the alarm unit, the communication unit and the circuit breaker control instruction output unit; the distribution line fault detection system analyzes and judges whether a ground fault occurs according to the voltage signals collected by the signal collection unit, judges whether the circuit breaker carries out reclosing operation according to different conditions, and uploads fault information to a remote monitoring center through the communication unit.
And the signal acquisition unit acquires voltage signals of all phases of the power distribution line, voltage signals of the inlet wire reactor and voltage signals of the neutral point small reactor by adopting a voltage sensor.
The signal conditioning unit comprises a filter circuit and an A/D converter, wherein the filter circuit filters high-frequency interference signals by adopting a low-pass filter, and the A/D converter converts analog signals into digital signals and outputs the digital signals.
And the circuit breaker control instruction output unit outputs the control instruction of the control processing unit to control whether the circuit breaker carries out reclosing operation.
The control processing unit adopts a microprocessor to analyze, judge and integrally control the fault detection system of the distribution line:
comparing each phase voltage signal of the distribution line with a first phase voltage reference value and a second phase voltage reference value, and if one phase voltage is smaller than the first phase voltage reference value and the other two phase voltages are larger than the second phase voltage reference value, generating a ground fault on the distribution line and timing the ground fault;
further, whether the accumulated time of the faults reaches a reference value is judged, if yes, the breaker is controlled to be switched off, and further extension of the ground faults is prevented;
further, calculating the difference between the voltage signal of the incoming line reactor and the voltage signal of the neutral point small reactance in fixed time after the circuit breaker is switched off
T is the fixed time after the circuit breaker is disconnected, U1(t) is the voltage signal of the reactor at time t within the fixed time, U2(t) is a neutral point small reactance voltage signal at the time t within the fixed time; comparing the difference K with a difference reference value, and if the difference K is larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to carry out reclosing operation; and if the difference reference value is not larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to reclose and lock.
The alarm unit adopts an audible and visual alarm, and when the distribution line breaks down, audible and visual alarm is timely sent out.
The communication unit uploads the detection information of the power transmission line fault processing system to the remote monitoring center by adopting a GPRS wireless communication technology, and meanwhile, remote parameter setting can be carried out on the power distribution line fault processing system.
Compared with the prior art, the beneficial effects are: the distribution line fault detection system determines whether the breaker is reclosed according to the difference between the voltage signal of the incoming line reactor and the voltage signal of the neutral point small reactor after the breaker is disconnected due to the fact that the ground fault of the distribution line cannot be solved in time, and therefore safety and efficiency of the system are improved.
Drawings
Fig. 1 is a schematic structural diagram of a distribution line fault detection system according to the present invention.
Detailed Description
The following describes a detailed embodiment of a distribution line fault detection system according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the distribution line fault detection system of the present invention includes a signal acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit, a communication unit, and a circuit breaker control instruction output unit, wherein the signal acquisition unit is sequentially connected to the signal conditioning unit and the control processing unit, and the control processing unit is further connected to the display unit, the alarm unit, the communication unit, and the circuit breaker control instruction output unit, respectively; the distribution line fault detection system analyzes and judges whether a ground fault occurs according to the voltage signals collected by the signal collection unit, judges whether the circuit breaker carries out reclosing operation according to different conditions, and uploads fault information to a remote monitoring center through the communication unit.
And the signal acquisition unit acquires voltage signals of all phases of the power distribution line, voltage signals of the inlet wire reactor and voltage signals of the neutral point small reactor by adopting a voltage sensor.
The signal conditioning unit comprises a filter circuit and an A/D converter, wherein the filter circuit filters high-frequency interference signals by adopting a low-pass filter, and the A/D converter converts analog signals into digital signals and outputs the digital signals.
And the circuit breaker control instruction output unit outputs the control instruction of the control processing unit to control whether the circuit breaker carries out reclosing operation.
The control processing unit adopts a microprocessor to analyze, judge and integrally control the fault detection system of the distribution line:
comparing each phase voltage signal of the distribution line with a first phase voltage reference value and a second phase voltage reference value, and if one phase voltage is smaller than the first phase voltage reference value and the other two phase voltages are larger than the second phase voltage reference value, generating a ground fault on the distribution line and timing the ground fault;
further, whether the accumulated time of the faults reaches a reference value is judged, if yes, the breaker is controlled to be switched off, and further extension of the ground faults is prevented;
further, calculating the difference between the voltage signal of the incoming line reactor and the voltage signal of the neutral point small reactance in fixed time after the circuit breaker is switched off
T is the fixed time after the circuit breaker is disconnected, U1(t) is the voltage signal of the reactor at time t within the fixed time, U2(t) is a neutral point small reactance voltage signal at the time t within the fixed time; comparing the difference K with a difference reference value, and if the difference K is larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to carry out reclosing operation; and if the difference reference value is not larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to reclose and lock.
The alarm unit adopts an audible and visual alarm, and when the distribution line breaks down, audible and visual alarm is timely sent out.
The communication unit uploads the detection information of the power transmission line fault processing system to the remote monitoring center by adopting a GPRS wireless communication technology, and meanwhile, remote parameter setting can be carried out on the power distribution line fault processing system.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A distribution line fault detection system is characterized by comprising a signal acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit, a communication unit and a circuit breaker control instruction output unit, wherein the signal acquisition unit is sequentially connected with the signal conditioning unit and the control processing unit, and the control processing unit is respectively connected with the display unit, the alarm unit, the communication unit and the circuit breaker control instruction output unit; the distribution line fault detection system analyzes and judges whether a ground fault occurs according to the voltage signals collected by the signal collection unit, judges whether the circuit breaker carries out reclosing operation according to different conditions, and uploads fault information to a remote monitoring center through the communication unit.
2. The system according to claim 1, wherein the signal acquisition unit acquires the voltage signals of the phases of the distribution line, the voltage signal of the incoming line reactor and the voltage signal of the neutral point small reactor by using a voltage sensor.
3. The distribution line fault detection system of claim 2, wherein the signal conditioning unit comprises a filter circuit and an a/D converter, the filter circuit uses a low-pass filter to filter out high-frequency interference signals, and the a/D converter converts analog signals into digital signals for output.
4. The distribution line fault detection system of claim 3, wherein the circuit breaker control instruction output unit outputs the control instruction of the control processing unit to control whether the circuit breaker performs reclosing operation.
5. The distribution line fault detection system of claim 4, wherein the control processing unit uses a microprocessor to perform information analysis, judgment and overall control on the distribution line fault detection system:
comparing each phase voltage signal of the distribution line with a first phase voltage reference value and a second phase voltage reference value, and if one phase voltage is smaller than the first phase voltage reference value and the other two phase voltages are larger than the second phase voltage reference value, generating a ground fault on the distribution line and timing the ground fault;
judging whether the accumulated time of the faults reaches a reference value, if so, controlling the breaker to be disconnected, and preventing the ground fault from further expanding;
calculating the difference between the voltage signal of the incoming line reactor and the voltage signal of the neutral point small reactor in fixed time after the circuit breaker is switched off
T is the fixed time after the circuit breaker is disconnected, U1(t) is the voltage signal of the reactor at time t within the fixed time, U2(t) is a neutral point small reactance voltage signal at the time t within the fixed time; comparing the difference K with a difference reference value, and if the difference K is larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to carry out reclosing operation; and if the difference reference value is not larger than the difference reference value, controlling the circuit breaker control instruction output unit to control the circuit breaker to reclose and lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372443.3A CN113176471A (en) | 2021-04-07 | 2021-04-07 | Distribution lines fault detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110372443.3A CN113176471A (en) | 2021-04-07 | 2021-04-07 | Distribution lines fault detection system |
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| CN113176471A true CN113176471A (en) | 2021-07-27 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656167A (en) * | 2017-10-31 | 2018-02-02 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
| CN107785865A (en) * | 2017-11-29 | 2018-03-09 | 李建设 | State measurement strategy and circuit before faulty line reclosing |
| CN110568319A (en) * | 2019-10-25 | 2019-12-13 | 国网江苏省电力有限公司盐城供电分公司 | Power transmission line fault type judgment method based on signal difference |
| CN110596509A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line fault processing system based on different fault types and detection method thereof |
| CN112067944A (en) * | 2020-09-09 | 2020-12-11 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase grounding fault detection control method for power transmission and distribution line |
| CN112255571A (en) * | 2020-10-29 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Earth fault detection system with neutral point indirectly grounded |
-
2021
- 2021-04-07 CN CN202110372443.3A patent/CN113176471A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656167A (en) * | 2017-10-31 | 2018-02-02 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
| CN107785865A (en) * | 2017-11-29 | 2018-03-09 | 李建设 | State measurement strategy and circuit before faulty line reclosing |
| CN110596509A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line fault processing system based on different fault types and detection method thereof |
| CN110568319A (en) * | 2019-10-25 | 2019-12-13 | 国网江苏省电力有限公司盐城供电分公司 | Power transmission line fault type judgment method based on signal difference |
| CN112067944A (en) * | 2020-09-09 | 2020-12-11 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase grounding fault detection control method for power transmission and distribution line |
| CN112255571A (en) * | 2020-10-29 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Earth fault detection system with neutral point indirectly grounded |
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