CN113328411A - Method and device for automatically cutting off power supply of power supply overhead line - Google Patents
Method and device for automatically cutting off power supply of power supply overhead line Download PDFInfo
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- CN113328411A CN113328411A CN202110583983.6A CN202110583983A CN113328411A CN 113328411 A CN113328411 A CN 113328411A CN 202110583983 A CN202110583983 A CN 202110583983A CN 113328411 A CN113328411 A CN 113328411A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a method and a device for automatically cutting off power supply of a power supply overhead line, wherein a processing module acquires a sensing signal and processes the sensing signal as follows: step 1: the processing module judges whether the sensing signals reach a threshold value set A1, and if at least one sensing signal reaches a set threshold value set A1, the step2 is started; or the processing module judges whether the sensing signals reach a threshold value set A1, if at least one of the at least two sensing signals reaches a set threshold value, the step2 is carried out; otherwise, returning to the step1. Step 2: starting to monitor the sensing signals according to a set timing T1, and if at least one sensing signal exceeds a threshold group A1 and/or the duration of T1 is more than a threshold group A1 for N times continuously in the timing T1, performing step 3; otherwise, returning to the step 1; and step 3: and continuously outputting an alarm signal and/or cutting off a power supply line control pulse signal. The invention has accurate control and is beneficial to preventing the tripping of the power station circuit breaker caused by severe weather.
Description
Technical Field
The invention relates to the technical field of power supply line control, in particular to a method and a device for automatically cutting off power supply of a power supply overhead line.
Background
The statistics shows that when severe weather such as thunderstorm and strong wind, frequently, power grid fluctuation is frequent, the main reason is that lightning strikes an overhead line to cause overcurrent short-circuit tripping, and obstacles blown by strong wind intrude into the safety distance of the overhead line to cause interphase short-circuit tripping and grounding. Therefore, unimportant overhead lines are cut off in severe weather, and tripping power failure of the power station caused by thunderstorm and strong wind can be reduced.
In the prior art, the weather condition is judged mainly by subjective feeling of operators on duty, so that the circuit is not cut off timely or unnecessarily, and the operation of a high-voltage switch and outdoor equipment in the thunderstorm weather has certain danger.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a method and a device for automatically cutting off power supply of a power supply overhead line, which solve the problems that the weather condition is judged based on subjective feeling in the prior art, the processing is not timely, the operation danger is high and the like, and prevent the power station circuit breaker from tripping caused by power grid fluctuation such as overhead line grounding, short circuit and the like due to severe weather.
The invention is realized by the following technical scheme:
a method for automatically cutting off power supply of a power supply overhead line comprises the following steps:
step1, starting a processing module;
step2, a processing module acquires a sensing signal in a sensing acquisition module;
step3. comprising:
setp31. the processing module judges whether the sensing signals reach a threshold value set A1, and if at least one sensing signal reaches a set threshold value set A1, Step4 is started;
or Setp32. the processing module judges whether the sensing signals reach a threshold value set A1, and if at least one sensing signal of each sensing signal reaches a set threshold value in at least two sensing signals, Step5 is carried out; otherwise, go back to Step2.
Wherein the steps Setp31 and Setp32 are in an alternative relationship.
Step4, starting to monitor the sensing signals according to a set time T1, and if at least one sensing signal continuously appears for N times within the time T1 and exceeds a threshold value set A1 and/or the duration of T1 is greater than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2;
step5, continuously outputting an alarm signal and/or cutting off a power supply line control pulse signal;
the threshold value group A1 is a threshold value group consisting of threshold values set by all the sensing acquisition modules; and N is a positive integer more than or equal to 1.
The invention adopts various out-of-limit algorithms as starting conditions, can better represent the continuous and stable existence of severe weather, and prevents accidental disturbance from causing maloperation. The weather early warning device can give accurate weather early warning to power station operators on duty, and remind the operators to pay attention to safety, such as stopping outdoor operation; the automatic cutting-off device can automatically cut off unimportant load lines, and effectively prevents risks caused by operating high-voltage equipment by personnel in severe weather.
More preferably, in Step3, the condition for activating Step4 further includes: if at least one sensing signal reaches a set threshold value set A1, more than two sensing acquisition modules are correspondingly arranged on the sensing signal of the type; selecting sensing signals corresponding to more than one sensing acquisition module based on voting calculation to judge whether the sensing signals reach a threshold value A1 or not, and starting Step4 if the sensing signals reach the threshold value A1; otherwise, go back to Step2.
More preferably, Step4 includes any one of the following two cases, or a combination of the two cases: starting to monitor the sensing signals according to a set timing T1, and if the sensing signals in at least one Setp31 continuously occur N times within the timing T1 and exceed a threshold value set A1 and/or the duration T1 is longer than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2; starting to monitor the sensing signals according to a set timing T3, and if at least one sensing signal which is different from the sensing signal described in Setp31 continuously occurs for P times within the timing T3 and exceeds a threshold value set A1 and/or the duration of T3 is more than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2; p is a positive integer more than or equal to 1.
The meaning of "at least one sensor signal as described in Setp 31" here is: what is detected as Setp31 is an acoustic sensor signal, where monitoring is the same kind of sensor signal, i.e. an acoustic sensor signal.
The meaning of "at least one is distinguished from the sensor signal described in Setp 31" here is: as detected by Setp31, acoustic sensor signals are monitored, where different kinds of sensor signals, non-acoustic sensor signals, such as rain sensor signals or wind speed sensor signals, are monitored.
Further preferably, Step4 comprises the following steps:
step41, after at least one sensing signal reaches the set threshold group A1, monitoring the type of sensing signal according to a set timing T1, and continuing to perform Step42 if the type of sensing signal exceeds the threshold group A1 for N times continuously within the timing T1 and/or the duration T1 is longer than the threshold group A1; otherwise, go back to Step 2;
step42, monitoring the rest type sensing signals according to a set timing T3, and continuing to Step5 if at least one rest type sensing signal continuously appears for P times within a timing T3 and exceeds a threshold value set A1 and/or the duration of T3 is greater than a threshold value set A1; otherwise, go back to Step2.
Further preferably, Step4 includes the following steps: starting to monitor the sensing signals according to a set timing T1, finishing timing T1, and accumulating 1 by counting the number D of out-of-limit times when at least one sensing signal exceeds a threshold group A1; the T1 is counted again, at least one sensing signal exceeds the threshold group A1 after the T1 is counted, and the out-of-limit times count D is accumulated to be 1; when the number of times D of out-of-limit accumulation reaches the set number of times E, Step5 is carried out; after the time T1 is timed out, if the sensing signal is not detected to exceed the threshold value set A1, the out-of-limit times D are cleared, and the Step2 is returned; and E is a positive integer more than or equal to 1.
Further preferably, the type of the sensing signal includes any one, two or three of a sound sensing signal, a rainfall sensing signal and a wind speed sensing signal; and each sensing signal comprises a signal sent by at least one corresponding sensing acquisition module.
Further preferably, the method also comprises Setp 6: respectively judging whether the sensing signals are lower than a threshold group A2 in a timing T2; if the sensing signals are lower than a set threshold group A2 and/or the duration time T2 is lower than a threshold group A2 for M continuous times in the timing T2, stopping outputting the alarm signals, and stopping sending the alarm signals by the signal output module; otherwise, go back to Step 6; m is a positive integer greater than or equal to 1; the threshold value group a2 is a threshold value group consisting of the set threshold values of the respective sensors.
Further preferably, the Setp6 includes the following steps:
step61, after at least one sensing signal is lower than the threshold group A2, monitoring the type of sensing signal according to a set timing T2, and continuing to perform step62 if the type of sensing signal is lower than the threshold group A2 for M times continuously within the timing T2 and/or the duration T2 is lower than the threshold group A2; otherwise, go back to step 61;
step62, starting to monitor the other types of sensing signals according to a set timing T4, continuously generating at least one type of other types of sensing signals for times of Q times in a timing T4, wherein the at least one type of other types of sensing signals are lower than a threshold group A2 and/or the time of duration T4 is lower than a threshold group A2, stopping outputting the alarm signal, and stopping sending the alarm signal by the signal output module; otherwise, go back to step 61;
q is a positive integer not less than 1.
A device for automatically cutting off power supply of a power supply overhead line is used for realizing the method for automatically cutting off the power supply of the power supply overhead line and comprises a sensing acquisition module, a processing module and a signal output module;
the sensing acquisition module is used for acquiring a sensor signal related to severe weather, converting the sensor signal into an analog/digital signal and providing the analog/digital signal to the processing module; the system comprises one or more than two of a sound sensing module, a rainfall sensing module and a wind speed sensing module; the processing module is used for acquiring the sensing signals of the sensing acquisition module, comparing and judging threshold groups according to a set program and outputting an alarm and/or control instruction; the signal output module is used for sending out an alarm signal and/or cutting off a power supply circuit; including audible and visual alarms and/or contactors.
Further preferably, the sensing and collecting module comprises one or more than two of a sound sensing module, a rainfall sensing module and a wind speed sensing module.
The invention has the following advantages and beneficial effects:
1. the invention combines three important sensors of rainfall, wind speed and thunder, and ensures reliable judgment of severe weather. Through a plurality of input signal comprehensive judgment, can effectually prevent that certain sensor is unusual, cause unexpected mistake that the out-of-limit arouses and move, also more comprehensive accuracy to the judgement of bad weather simultaneously.
2. The invention adopts various out-of-limit algorithms as starting conditions, can better represent the continuous and stable existence of severe weather, and prevents accidental disturbance from causing maloperation.
3. The invention can give accurate weather early warning to the power station on-duty personnel and remind the personnel to pay attention to safety, such as stopping outdoor operation.
4. The invention can realize automatic cutting of unimportant load lines, and effectively prevent the risk caused by operating high-voltage equipment by personnel in severe weather.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a logic diagram of the method of the present invention for automatically cutting off power to an overhead line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a method for automatically cutting off power supply of a power supply overhead line, which comprises the following specific steps:
the rainfall sensor, the wind speed sensor and the sound sensor are arranged on the sensing acquisition module, and the number of each sensor is 3.
When a certain sensing signal is met, for example, the sound sensing signal detected by the sound sensor reaches a set sound threshold a1 (for example, 85 db), the processing module detects the signal and performs a 2-out-of-3 voting judgment on the sound sensor, and when 2 of the sound sensors detect that the set sound threshold a1 is reached, a timer T1 (for example, 5 seconds) is started, and the timer T1 is ended to judge whether the wind speed sensing signal (2-out-of-3) reaches a set wind speed threshold a1 (for example, 15m/s) or whether the rainfall sensing signal (2-out-of-3) reaches a set rainfall threshold a1 (for example, 10 mm/min):
otherwise, the count D is cleared and it is re-detected whether the sound sensing signal detected by the sound sensor reaches the set sound threshold a 1.
If yes, the accumulated count D is added with 1, and if D does not reach the set value E (for example, 3), T1 is counted again, and then the wind speed sensing signal is judged to be out of limit or the rainfall sensing signal is judged. When D reaches the set value E (for example, 3), the condition that severe weather exists is judged, the output module outputs an acousto-optic alarm signal, and the contactor (switch) acts to control the tripping of the overhead line high-voltage circuit breaker.
Therefore, the unimportant load circuit can be automatically cut off, and the influence of the problems of barrier invasion, lightning stroke and the like on the power station due to the circuit can be reduced. After manual confirmation, the alarm signal is silenced or eliminated.
If the signal out-of-limit does not occur next time after the 1 st or 2 nd out-of-limit after the judgment cycle begins, the judgment cycle exits until the next sound out-of-limit restarts the judgment cycle. Therefore, the accuracy of judgment on severe weather can be effectively improved and the external interference is reduced by a method of continuous judgment for multiple times under strict starting conditions.
Example 2
The embodiment provides a method for automatically cutting off power supply of a power supply overhead line, which comprises the following specific steps:
the rainfall sensor, the wind speed sensor and the sound sensor are arranged on the sensing acquisition module, and the number of each sensor is 3.
When a certain sensor detection signal, for example, a sound sensing signal detected by a sound sensor reaches a set sound threshold a1 (for example, 85 decibels), the processing module detects the signal and performs 2-out-of-3 voting judgment on the sound sensor, when 2 of the sound sensors detect that the set sound threshold a1 is reached, a timer T1 (for example, 5 seconds) is started, the number of times that the accumulated sound signal (2-out-of-3) reaches the set sound threshold a1 (for example, 10mm/min) in the timer T1 reaches N times (for example, 3 times) or the duration of T1 (for example, 2 seconds) is greater than a threshold group a1, and at this time, it is determined that the weather is abnormal, and the output module outputs an audible and visual alarm signal.
And starting timing according to a set timing T3, monitoring the rainfall sensor and the wind speed sensor, wherein if a rainfall sensing signal (2 from 3) or a wind speed sensing signal (2 from 3) continuously appears for P (for example 3) times in the timing T3 and exceeds a set threshold A1 (for example, 10mm/min of rainfall and 15m/s of wind speed) or lasts for T3 (for example, 2 seconds) for more than a threshold A1, judging that severe weather exists, outputting an acousto-optic alarm signal by an output module, and controlling the tripping of the high-voltage circuit breaker of the overhead line by the action of a contactor (switch).
Therefore, the unimportant load circuit can be automatically cut off, and the influence of the problems of barrier invasion, lightning stroke and the like on the power station due to the circuit can be reduced.
Continuing to monitor the sensing signal, when any one of the three sensors, such as the sound sensing signal (2 out of 3) is lower than the set threshold A2 (sound 40 dB), the monitoring of the sound sensing signal is started according to the set time T2 (e.g. 10 seconds), the type signal is lower than the threshold A2 for M (e.g. 3) times continuously within the time T2 and/or the time (e.g. 3 seconds) for T2 is lower than the threshold A2, then monitoring of the rest type sensing signals (rain sensing signals and wind speed sensing signals) is continuously started according to a set timing T4 (for example, 10 seconds), at least one of the rest type sensing signals (3 to 2) is lower than a threshold value set A2 (rain 5mm/min and wind speed 5m/s) for continuous Q (for example, 3) times within a timing T4, and/or the time duration of T4 is lower than a threshold value set A2, outputting of the alarm signal is stopped, and the signal output module stops sending the alarm signal.
Example 3
The embodiment provides a method for automatically cutting off power supply of a power supply overhead line, which comprises the following specific steps:
the rainfall sensor, the wind speed sensor and the sound sensor are arranged on the sensing acquisition module, and the number of each sensor is 1.
When the processing module detects that two sensing signals, for example, the sound sensing signal detected by the sound sensor reaches a set sound threshold value A1 (for example, 80 decibels), and the wind speed sensing signal detected by the wind speed sensor reaches a set wind speed threshold value A1(15m/s), the output module outputs an audible and visual alarm signal to warn an operator.
When the processing module detects that two sensing signals, such as the sound sensing signal detected by the sound sensor, reach a set sound threshold A3 (for example, 90 decibels), and the wind speed sensing signal detected by the wind speed sensor reaches a set wind speed threshold A3(20m/s), the output module outputs an audible and visual alarm signal, and the contactor (switch) acts to control the high-voltage circuit breaker of the overhead line to trip.
Therefore, the unimportant load circuit can be automatically cut off, and the influence of the problems of barrier invasion, lightning stroke and the like on the power station due to the circuit can be reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for automatically cutting off power supply of a power supply overhead line is characterized by comprising the following steps:
step1, starting a processing module;
step2, a processing module acquires a sensing signal in a sensing acquisition module;
step3. comprising:
setp31. the processing module judges whether the sensing signals reach a threshold value set A1, and if at least one sensing signal reaches a set threshold value set A1, Step4 is started;
or Setp32. the processing module judges whether the sensing signals reach a threshold value set A1, and if at least one sensing signal of each sensing signal reaches a set threshold value in at least two sensing signals, Step5 is carried out; otherwise, return to Step 2;
step4, starting to monitor the sensing signals according to a set time T1, and if at least one sensing signal continuously appears for N times within the time T1 and exceeds a threshold value set A1 and/or the duration of T1 is greater than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2;
step5, continuously outputting an alarm signal and/or cutting off a power supply line control pulse signal;
the threshold value group A1 is a threshold value group consisting of threshold values set by all the sensing acquisition modules;
and N is a positive integer more than or equal to 1.
2. The method of claim 1 wherein said Step3 condition for initiating Step4 further comprises: if at least one sensing signal reaches a set threshold value set A1, more than two sensing acquisition modules are correspondingly arranged on the sensing signal of the type; selecting sensing signals corresponding to more than one sensing acquisition module based on voting calculation to judge whether the sensing signals reach a threshold value A1 or not, and starting Step4 if the sensing signals reach the threshold value A1; otherwise, go back to Step2.
3. The method for automatically cutting off power supply for overhead line of power supply as claimed in claim 1, wherein Step4 includes any one or combination of two cases:
starting to monitor the sensing signals according to a set timing T1, and if the sensing signals in at least one Setp31 continuously occur N times within the timing T1 and exceed a threshold value set A1 and/or the duration T1 is longer than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2;
starting to monitor the sensing signals according to a set timing T3, and if at least one sensing signal which is different from the sensing signal described in Setp31 continuously occurs for P times within the timing T3 and exceeds a threshold value set A1 and/or the duration of T3 is more than a threshold value set A1, continuing to Step 5; otherwise, return to Step 2;
p is a positive integer more than or equal to 1.
4. The method of claim 3, wherein Step4 comprises the steps of:
step41, after at least one sensing signal reaches the set threshold group A1, monitoring the type of sensing signal according to a set timing T1, and continuing to perform Step42 if the type of sensing signal exceeds the threshold group A1 for N times continuously within the timing T1 and/or the duration T1 is longer than the threshold group A1; otherwise, go back to Step 2;
step42, monitoring the rest type sensing signals according to a set timing T3, and continuing to Step5 if at least one rest type sensing signal continuously appears for P times within a timing T3 and exceeds a threshold value set A1 and/or the duration of T3 is greater than a threshold value set A1; otherwise, go back to Step2.
5. The method for automatically cutting off the power supply of the power supply overhead line according to the claim 1, characterized in that the Step4 comprises the following steps:
starting to monitor the sensing signals according to a set timing T1, finishing timing T1, and accumulating 1 by counting the number D of out-of-limit times when at least one sensing signal exceeds a threshold group A1;
the T1 is counted again, at least one sensing signal exceeds the threshold group A1 after the T1 is counted, and the out-of-limit times count D is accumulated to be 1;
when the number of times D of out-of-limit accumulation reaches the set number of times E, Step5 is carried out;
after the time T1 is timed out, if the sensing signal is not detected to exceed the threshold value set A1, the out-of-limit times D are cleared, and the Step2 is returned;
and E is a positive integer more than or equal to 1.
6. A method for automatic removal of power supplied overhead line power according to claim 5,
the types of the sensing signals comprise any one, two or three of sound sensing signals, rainfall sensing signals and wind speed sensing signals; and each sensing signal comprises a signal sent by at least one corresponding sensing acquisition module.
7. Method for automatic removal of power supply overhead line power supply according to any of claims 1 to 6, characterized in that it further comprises the steps of Setp 6:
respectively judging whether the sensing signals are lower than a threshold group A2 in a timing T2; if the sensing signals are lower than a set threshold group A2 and/or the duration time T2 is lower than a threshold group A2 for M continuous times in the timing T2, stopping outputting the alarm signals, and stopping sending the alarm signals by the signal output module; otherwise, go back to Step 6;
m is a positive integer greater than or equal to 1;
the threshold value group a2 is a threshold value group consisting of the set threshold values of the respective sensors.
8. Method for the automatic removal of the power supply of overhead lines according to claim 7, characterized in that said Setp6 comprises the following steps:
step61, after at least one sensing signal is lower than the threshold group A2, monitoring the type of sensing signal according to a set timing T2, and continuing to perform step62 if the type of sensing signal is lower than the threshold group A2 for M times continuously within the timing T2 and/or the duration T2 is lower than the threshold group A2; otherwise, go back to step 61;
step62, starting to monitor the other types of sensing signals according to a set timing T4, continuously generating at least one type of other types of sensing signals for times of Q times in a timing T4, wherein the at least one type of other types of sensing signals are lower than a threshold group A2 and/or the time of duration T4 is lower than a threshold group A2, stopping outputting the alarm signal, and stopping sending the alarm signal by the signal output module; otherwise, go back to step 61;
q is a positive integer not less than 1.
9. A device for automatically cutting off power supply of a power supply overhead line is characterized by comprising a sensing acquisition module, a processing module and a signal output module;
the sensing acquisition module is used for acquiring a sensor signal related to severe weather, converting the sensor signal into an analog/digital signal and providing the analog/digital signal to the processing module; the system comprises one or more than two of a sound sensing module, a rainfall sensing module and a wind speed sensing module;
the processing module is used for acquiring the sensing signals of the sensing acquisition module, comparing and judging threshold groups according to a set program and outputting an alarm and/or control instruction;
the signal output module is used for sending out an alarm signal and/or cutting off a power supply circuit; including audible and visual alarms and/or contactors.
10. The device for automatically cutting off the power supply of the power supply overhead line is characterized in that the sensing and collecting module comprises one or more than two of a sound sensing module, a rainfall sensing module and a wind speed sensing module.
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| CN110190586A (en) * | 2019-06-11 | 2019-08-30 | 阳光电源股份有限公司 | It is a kind of to cross method of flow control, equipment and system |
| CN111157855A (en) * | 2019-12-31 | 2020-05-15 | 山东信通电子股份有限公司 | Method for judging transmission line fault and server |
| CN112578724A (en) * | 2020-12-15 | 2021-03-30 | 国家电网有限公司 | Power transmission line monitoring system |
| CN112688434A (en) * | 2021-01-15 | 2021-04-20 | 广州穗能通能源科技有限责任公司 | Monitoring and early warning method and device for power transmission and distribution line, computer equipment and medium |
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