CN117970186A - Fault diagnosis method and system for distribution room - Google Patents
Fault diagnosis method and system for distribution room Download PDFInfo
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Abstract
The application relates to the technical field of circuit fault detection, in particular to a fault diagnosis method and system for a distribution room, wherein the method comprises the following steps: a database establishing step, an information obtaining step, a preliminary judgment step, a fault judgment step, a hidden danger judgment step, an integration judgment step, a current fluctuation fault probability calculation step and a risk possibility grading step; wherein the system comprises the following modules: the system comprises a database, an information acquisition module, a preliminary judgment module, a fault judgment module, a hidden danger judgment module, an integration judgment module, a current fluctuation fault probability calculation module and a fault risk classification module. The application has the effect of reducing the influence on the fault diagnosis result.
Description
Technical Field
The application relates to the technical field of circuit fault detection, in particular to a fault diagnosis method and system for a distribution room.
Background
At present, a power distribution room is a core part of an electric power system in a building, and faults can cause safety problems such as fire disaster, electric shock and the like, so that potential risks can be found through timely diagnosis and detection, and the safety of the building and personnel is ensured.
The fault detection of the distribution room generally adopts the following method: visual inspection: firstly, carrying out a comprehensive visual inspection to check whether the equipment, cables, wiring and connectors in the distribution room are obviously damaged, burned or abnormal; special attention is paid to the presence or absence of burn marks or smoke, which may indicate that a certain device or line has failed; measuring voltage and current: the universal meter or the professional electric energy meter is used for measuring the voltage and the current of each circuit so as to ensure that a power supply and load equipment work normally, when the current method detection is carried out, the current condition of each branch is detected, whether faults such as short circuit, open circuit, damage to electric elements and the like exist is judged according to the fluctuation change of the current, however, when the input voltage changes, the fluctuation of the current exists, and the fault detection result is easily influenced.
Disclosure of Invention
In order to reduce the influence on fault diagnosis results, the application provides a distribution room fault diagnosis method and system.
In a first aspect, the present application provides a fault diagnosis method and system for a power distribution room, which adopts the following technical scheme:
a method of power distribution room fault diagnosis comprising the steps of:
Establishing a database: dividing the distribution room into a plurality of detection units, wherein each detection unit comprises a plurality of electrical elements and is connected through connecting wires to form a circuit, and a sensor for detecting input voltage and detection current is arranged on the circuit;
Information acquisition: the input voltage and the detection current are obtained by a voltage sensor and a current sensor, and a voltage set is formed And current set [/>)The voltage set and the current set are mapped one by one;
preliminary judgment: judging the input voltage detected in the c-1 th time Whether or not to be equal to the input voltage of the c-th detection/>If yes, performing fault judgment, if not, continuously acquiring the (c+1) -th input voltage and the detection current through the sensor, and judging whether the input voltages are equal again;
and (3) fault judgment: judging whether the risk value S is equal to zero, if so, judging that the fault exists preliminarily, and if not, judging that the fault exists;
The risk value S is determined as follows:
；
When s=0, the output fault result is normal; s= Outputting a fault result as open circuit; s=/>And outputting a fault result to be undetermined.
By adopting the technical scheme, when fault diagnosis of the distribution room is carried out, a voltage set and a current set are formed through information acquisition, then input voltage comparison is carried out, risk value comparison is carried out on the same input voltage, whether the front current and the rear current are the same or not is determined through the determination of the risk value under the same input voltage, the circuit can be normally operated is indicated when the front current and the rear current are the same and are greater than zero, the condition of open circuit is indicated when the two currents are both zero, if the two currents are not equal and are not zero, the fault is indicated to exist possibly, the fault is also not available, and the output is pending, and independent detection can be carried out; by the diagnosis method, whether the circuit has faults or not is primarily judged, whether the input voltages are equal or not is judged through the preliminary primary judgment step, interference of comparison judgment of the currents under different voltages to actual fault diagnosis is reduced, single variable is maintained, noise is reduced, and accuracy of primary fault diagnosis is improved.
Optionally, after the output fault result is undetermined, a hidden danger judging step and an integration judging step are further arranged;
And (5) hidden danger judgment: judging Whether the potential hazards are equal to zero or not, if so, judging that the potential hazards exist; otherwise, executing the integration judgment step;
And (3) integration judgment: judging Whether the potential risk is equal to zero or not, if not, judging the potential risk, and executing short circuit judgment; if so, the detection current/>, of the c+1th time is obtainedAnd whether the current is zero or not is judged, if yes, the current is judged to be open, and if not, the current is judged to be hidden danger.
Through adopting above-mentioned technical scheme, when the fault result is waiting to be regularly, through hidden danger judging step and integration judging step, wait to decide the result, carry out further analysis and comparison, examine short circuit, open circuit condition and hidden danger existence for the diagnosis result is more accurate, and can be according to hidden danger suggestion, once screen the circuit is whole, in time get rid of hidden danger, reduces the emergence of trouble and accident.
Optionally, after the hidden danger is determined, a current fluctuation fault probability calculating step is further provided:
And (3) obtaining the same pressure: comparing the voltages in the voltage sets to form the same voltage set ，/>Each voltage corresponds to the same voltage current set [/> ], and，/>，/>，...，/>，/>]，[/>，/>，/>，...，/>，/>]，[/>，/>，，...，/>，/>]，...，[/>，/>，/>，...，/>，/>]，[/>，/>，/>，...，/>，/>]；
Judging current abnormality: at voltageLower rated current/>Judging the same-voltage current set [/> ] one by one，/>，/>，...，，/>Whether or not to match rated current/>Record equal current number/>And total number in same-voltage current set/>；
The calculation formula of the same-voltage fault probability is as follows:；
The current ripple fault probability calculation formula is as follows: =/>。
By adopting the technical scheme, when the potential hazards are judged, the same-voltage set can be acquired, all values of current under the same voltage are acquired, the values are respectively compared with rated current under the current voltage, and then the probability of occurrence of fluctuation is calculated.
Optionally, after the hidden danger is determined, a voltage fluctuation fault probability obtaining step is further provided:
intercepting the voltage change in the time T in the voltage set, obtaining the frequency n of voltage fluctuation in the limited frequency m, and calculating the probability of the voltage fluctuation ：
Probability of voltage fluctuationThe calculation model of (2) is as follows: /(I)。
Through adopting above-mentioned technical scheme, under normal condition, the fluctuation general variation of voltage is little, mainly with the power grid power supply frequency is related, the power supply frequency of electric wire netting is at present general low frequency, about 0.1Hz, but when some electrical component damages, can lead to the influence to voltage fluctuation, through the calculation of voltage fluctuation frequency, when voltage fluctuation is too big or continuously undulant, can lead to electrical component operational environment overheated or appear other influences, lead to electrical component to damage, cause the production of trouble, through the quantization of voltage fluctuation probability, make the probability that probably causes the trouble to obtain clear cognition, and then be convenient for in time check, reduce the probability that the trouble appears.
Optionally, after the step of obtaining the voltage fluctuation fault probability, calculating hidden danger occurrence probability is further set;
probability of occurrence of hidden trouble The calculation model of (2) is as follows: /(I)；
In the method, in the process of the invention,Power frequency for power grid,/>The real-time power grid voltage fluctuation frequency is set;
in the method, in the process of the invention, The calculation model of (2) is as follows: /(I)=/>；
In the method, in the process of the invention,The calculation model of (2) is as follows: /(I)=/>+/>*/>。
Through adopting above-mentioned technical scheme, when voltage fluctuation also exists when the electric current is undulant, probably causes the probability increase of trouble, and through voltage fluctuation frequency and the contrast of electric wire netting power supply frequency at this moment, distinguish whether there is voltage fluctuation, then calculate out hidden danger probability according to hidden danger probability calculation model for hidden danger conversion becomes the probability of trouble more accurate, is convenient for in time carry out the pertinence and handles, reduces the production of trouble.
Optionally, the fault risk probability grades are classified as i, ii, iii, and the corresponding current fluctuation fault frequency corresponds to the fault risk probability grade:
If it is ＜/>The fault risk potential grade is I;
If it is ＜/>＜/>The failure risk potential grade is II;
If it is ＞/>The failure risk potential rating is iii.
Through adopting above-mentioned technical scheme, when the current fluctuates, can match according to current fluctuation fault frequency and trouble risk probability level, learn the trouble risk level, operating personnel can carry out corresponding processing according to the level, and this level represents the serious level of hidden danger processing, can be according to current work arrangement, handles comparatively urgent work at first, when the trouble risk probability level is III, then needs to handle immediately, reduces hidden danger and changes to the trouble.
Optionally, the probability of occurrence of hidden dangerAfter the step, equipment damage fault level matching is also set:
dividing equipment fault grade into 、/>And/>；
If it is＜/>The equipment failure level is/>；
If it is＜/>＜/>The equipment failure level is/>；
If it is＞/>The equipment failure level is/>。
Through adopting above-mentioned technical scheme, when voltage fluctuation and current fluctuation exist simultaneously, indicate that in this circuit, the hidden danger exists more, and the severity level is higher this moment, can match with equipment damage fault level according to hidden danger probability of occurrence, then confirm the severity level, then handle according to the severity level, and equipment damage fault level is higher than the trouble risk probability level, when appearing simultaneously, carries out harm processing with equipment damage fault level preferentially.
In a second aspect, the present invention provides a fault diagnosis system for a power distribution room, which adopts the following technical scheme:
a power distribution room fault diagnosis system comprising the following modules:
database: the circuit is used for storing each detection unit, historical fault data and detection data of each detection unit and information of each electrical element of the circuit;
an information acquisition module: the method comprises the steps of obtaining input voltage, detection current and rated current of a circuit to form a voltage set and a current set;
and a preliminary judgment module: for judging whether the input voltages are equal;
And a fault judging module: after judging that the input voltages are equal, judging whether a fault exists or not by judging whether the risk value is equal to zero or not;
hidden danger judging module: is used for judging whether hidden danger exists or not;
And the integration judging module is used for: the method is used for judging whether short circuit or open circuit or hidden danger exists after the hidden danger judgment is performed;
The current fluctuation fault probability calculation module is used for: the method is used for calculating the current fluctuation fault probability;
fault risk likelihood ranking module: the probability level is matched according to the current ripple fault probability.
Through adopting the technical scheme, when fault diagnosis of each detection unit in the power distribution room is carried out, firstly, data information is acquired through a database and an information acquisition module, then, input voltage is compared through a preliminary judgment module, when the input voltages are the same, execution of the fault judgment module can be carried out, whether faults exist or not is determined through risk value judgment, then, hidden danger judgment module is executed to judge whether hidden danger exists or not, then, an integration judgment module is executed after hidden danger judgment is completed, then, short circuit, open circuit or hidden danger determination is carried out, then, a current fluctuation fault probability calculation module is executed, calculation of current fluctuation fault probability is carried out, then, corresponding matching fault risk classification is carried out, and the severity degree of hidden danger existence is used for operators to obtain corresponding processing.
Optionally, the system further comprises a voltage fluctuation fault probability module and a hidden danger occurrence probability module;
Voltage fluctuation fault probability module: the method is used for calculating the voltage fluctuation fault probability;
Hidden danger occurrence probability module: and calculating the hidden danger occurrence probability based on the current fluctuation fault probability and the voltage fluctuation fault probability.
Through adopting above-mentioned technical scheme, when voltage fluctuation takes place, voltage fluctuation can cause the influence to electrical component, through voltage fluctuation fault probability's calculation and current fault probability's calculation, obtains hidden danger probability, confirms the probability condition that hidden danger turned into the trouble this moment to operating personnel judges according to it, and carries out investigation processing to the circuit according to the probability condition, through the probabilization, makes the severity can be audio-visual discovery, is convenient for in time deal with the processing.
Optionally, the device damage fault classification module is further included;
Equipment damage fault classification module: the method is used for matching equipment damage fault grades according to the occurrence probability of hidden danger.
Through adopting above-mentioned technical scheme, when voltage fluctuation and current fluctuation take place simultaneously, equipment damages trouble grade division module execution to confirm the trouble grade according to hidden danger probability of occurrence, then operating personnel carries out the timely investigation of hidden danger according to the trouble grade, and then is convenient for in time discover the dangerous source, in time handles, reduces the probability that the trouble takes place.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. by the diagnosis method, whether the circuit has faults or not is primarily judged, whether the input voltages are equal or not is judged through the preliminary primary judgment step, interference of comparison judgment of the currents under different voltages on actual fault diagnosis is reduced, a single variable is maintained, and accuracy of primary fault diagnosis is improved.
2. When the potential hazards are judged, the same-voltage set can be obtained, all values of the current under the same voltage are obtained, the values are respectively compared with rated current under the current voltage, then the occurrence probability of fluctuation is calculated, the occurrence probability of the current fluctuation is quantized through the method, the occurrence probability of faults possibly caused by the current fluctuation can be obtained through analysis of the probability, and then the potential hazards can be removed in time, so that the occurrence probability of the faults is reduced.
3. When voltage fluctuation and current fluctuation exist simultaneously, the circuit is indicated to have more hidden danger, the severity level is higher at the moment, the hidden danger can be matched with the equipment damage fault level according to the occurrence probability of the hidden danger, then the severity level is determined, the equipment damage fault level is processed according to the severity level, and the equipment damage fault level is higher than the fault risk possibility level, and when the hidden danger exists simultaneously, the equipment damage fault level is preferentially processed in a hazard manner;
4. When voltage fluctuation and current fluctuation occur simultaneously, the equipment damage fault grade dividing module executes, the fault grade is determined according to the occurrence probability of hidden danger, then an operator performs timely investigation of hidden danger according to the fault grade, and therefore a dangerous source can be found out timely, the dangerous source can be processed timely, and the occurrence probability of faults is reduced.
Drawings
FIG. 1 is a flow chart of a method for diagnosing faults in a power distribution room in embodiment 1 of the present application;
FIG. 2 is a flow chart of a method for diagnosing faults in a power distribution room in embodiment 2 of the present application;
Fig. 3 is a system block diagram of a distribution room fault diagnosis system in an embodiment of the present application.
Detailed Description
The application is described in further detail below in connection with fig. 1 to 3.
The embodiment discloses a fault diagnosis method for a distribution room.
Example 1: referring to fig. 1, a power distribution room fault diagnosis method includes the steps of:
S1, establishing a database: dividing the distribution room into a plurality of detection units, wherein each detection unit comprises a plurality of electrical components and is connected through connecting wires to form a circuit, and a voltage sensor for detecting input voltage and a current sensor for detecting current are arranged on the circuit;
Specifically, the power distribution room is divided into a plurality of detection units, a single system unit or a single power distribution cabinet or a power distribution system can be used as one detection unit, the detection unit is a circuit containing a plurality of electric elements, a voltage sensor for detecting input voltage is arranged on the circuit, a voltage sensor for detecting real-time voltage of the electric elements is arranged at each electric element, whether faults exist or not is judged, a current sensor is arranged on the circuit and used for acquiring current information, and the current information and the voltage information are stored in a database.
S2, information acquisition: the input voltage and the detection current are obtained by a voltage sensor and a current sensor, and a voltage set is formedAnd current set [/>)The voltage set and the current set are mapped one by one;
Specifically, when voltage and current detection is performed, voltage and current can be obtained in real time within a certain time range, a plurality of input voltage values are formed into a voltage set, a plurality of currents are formed into a current set, and the voltage set and the current set are mapped one by one.
S3, preliminary judgment: judging the input voltage detected in the c-1 th timeWhether or not to be equal to the c-th detected input voltageIf yes, performing fault judgment, if not, continuously acquiring the (c+1) -th input voltage and the detection current through the sensor, and judging whether the input voltages are equal again;
Specifically, the front input voltage and the rear input voltage in the voltage set are compared, if the voltages are the same, the next fault judging step is carried out, if the voltages are different, the input voltages are continuously compared or obtained again, whether the two input voltages are equal at the moment is judged, the interference of voltage change on current change is reduced, when the circuit is complete and has no fault, the voltage change also affects the current, and therefore the noise is reduced by selecting the fault judgment under the same voltage, and the result is more accurate.
S4, fault judgment: judging whether the risk value S is equal to zero, if so, judging that no fault exists, and if not, primarily judging that the fault exists;
The risk value S is determined as follows:
；
when s=0, outputting a fault result as a normal Z; s= When the fault result is output as the open circuit/>；S=/>And outputting a fault result to be undetermined.
Specifically, intercepting current data of two times before and after under the same voltage, when the current data of two times or more are the same, the current circuit is stable, the work of a power distribution room is not affected, the output can be the normal Z at the moment, in other embodiments, the comparison of rated current under the current voltage can be executed, if the current is larger or smaller than the rated current, hidden danger can exist in the circuit, normal work is not affected, and the comparison judgment of difference value can be carried out to see whether the current is normal fluctuation.
When the current data or the multiple data of the current and the multiple data are zero, the current circuit can be directly judged to have open circuit, the current circuit fails and cannot be normally used, and timely processing and fault clearing are needed.
When the current data of the current is different and not all the current data are zero at the front and the back times, the current is indicated to have fluctuation, the fault result is undetermined, and further judgment is needed.
When the output fault result is undetermined, a hidden danger judging step and an integration judging step are further arranged;
S5, hidden danger judging step: judging Whether the potential hazard Y is equal to zero or not, if so, judging that the potential hazard Y exists; otherwise, executing the integration judgment step;
s6, an integration judging step: judging Whether the current is equal to zero or not, if not, carrying out a short circuit judging step; if so, the detection current/>, of the c+1th time is obtainedAnd judging whether the signal is zero, if so, judging that the signal is a circuit breaker/>If not, the hidden trouble Y can be determined.
Specifically, when the current data is unequal two or more times before and after at the same voltage, three cases are also classified as follows:
a、=0，/> not equal to 0, when the current fluctuates, the situation that the connection is unstable or partial discharge exists is indicated, and hidden danger exists in the circuit;
b、≠0，/> =0, where the current is unstable, but there is a possibility that a circuit is just open, or partial discharge, where there is a hidden danger in the circuit, it needs to be re-acquired once or more times if the current at the same voltage is zero, if zero is open, otherwise, the current fluctuates, and the circuit has a hidden danger;
c、≠0，/> Not equal to 0, the current is unstable at this moment, the same-voltage current information can be acquired again for a plurality of times, whether the current is stable or not can be judged, if so, the short circuit exists, otherwise, the current fluctuation can be directly judged, and the circuit has hidden danger.
Judging short circuit: obtaining the detection current of the c+1th timeJudge/>Whether or not to equal/>If yes, the current is short-circuited, and if not, the current is fluctuated, so that hidden danger exists.
Specifically, the current detected by the same voltage for a plurality of times after the c-th time can be obtained for comparison, if the current is stable, the current is short-circuited, and if the current is unstable, the current is fluctuated, so that hidden danger exists.
After the hidden danger is determined, a current fluctuation fault probability calculating step S7 is further provided:
s7-1, obtaining at the same pressure: comparing the voltages in the voltage sets to form the same voltage set ，/>Each voltage corresponds to the same voltage current set [/> ], and，/>，/>，...，/>，/>]，[/>，，/>，...，/>，/>]，[/>，/>，/>，...，/>，/>]，...，[/>，/>，/>，...，/>，/>]，[/>，/>，，...，/>，/>]；
Specifically, intercepting part of voltages in the voltage set for comparison, renumbering the voltages with the same pressure to form the same-voltage set, and then forming different currents corresponding to the same voltage into the same-voltage current set;
S7-2, judging abnormality of current: at voltage Lower rated current/>Judging the same-voltage current set [/> ] one by one，/>，/>，...，/>，/>Whether or not to match rated current/>Record equal current number/>And total number in same-voltage current set/>；
The calculation formula of the same-voltage fault probability is as follows:；
The current ripple fault probability calculation formula is as follows: =/>。
Specifically, current abnormality judgment is carried out, one or more voltage values are taken, currents in the same-voltage current sets are compared with rated currents respectively, the total number of the currents in the same-voltage current sets and the same number as the rated currents are judged under the same voltage, probability calculation is carried out, fault probability under a plurality of voltages is calculated, and then average value is calculated to obtain current fluctuation fault probability.
S8, dividing fault risk probability grades into I, II and III, wherein the corresponding current fluctuation fault frequency corresponds to the fault risk probability grade:
If it is ＜/>The fault risk potential grade is I;
If it is ＜/>＜/>The failure risk potential grade is II;
If it is ＞/>The failure risk potential rating is iii.
In particular, the method comprises the steps of,And/>The value of (2) can be determined according to the length of the circuit or the condition of the electric element affected by the current, and also can be a fixed value/>=/>，/>=/>; The risk of failure probability ranking table is divided as in table 1 below, with probability ranking i being the smallest and severity smallest.
Table 1 fault risk likelihood ranking
The operator may determine severity based on the level of risk of failure probability, select the timing of the process, and countermeasures may correspond to table 2 below.
TABLE 2 risk rating and corresponding measures
The implementation principle of the embodiment 1 of the application is as follows: when fault diagnosis of a distribution room is carried out, input voltage and current are firstly obtained through a voltage sensor and a current sensor, a voltage set and a current set are formed through obtained information, then input voltage comparison is carried out, risk value comparison is carried out on the same input voltage, whether the two front and rear currents are the same or not is determined through determination of the risk value under the condition that the same input voltage, the current is the same and is larger than zero at the front and rear, normal operation of a circuit is indicated, when the two currents are both zero, the condition of open circuit is indicated, if the two currents are not equal and are not zero, the condition that faults possibly exist or not exist is indicated, the fault is output to be undetermined, hidden danger judgment step and integration judgment step can be carried out, after the hidden danger is judged, probability calculation of current fluctuation is carried out, then the probability of current fluctuation corresponds to the probability of fault risk grade, an operator can take corresponding countermeasure according to the probability grade of fault risk, hidden danger is cleared timely, and occurrence of faults is reduced.
Example 2: referring to fig. 2, the present embodiment is different from embodiment 1 in that, after the current fluctuation probability calculation is completed, a voltage fluctuation failure probability acquisition step S9 is further provided:
intercepting the voltage change in the time T in the voltage set, obtaining the frequency n of voltage fluctuation in the limited frequency m, and calculating the probability of the voltage fluctuation ：
Probability of voltage fluctuationThe calculation model of (2) is as follows: /(I)。
After the step of acquiring the voltage fluctuation fault probability, a hidden danger occurrence probability calculation step S10 is further arranged;
probability of occurrence of hidden trouble The calculation model of (2) is as follows:
；
in the method, in the process of the invention, Power frequency for power grid,/>The real-time power grid voltage fluctuation frequency is set;
in the method, in the process of the invention, The calculation model of (2) is as follows: /(I)=/>；
In the method, in the process of the invention,The calculation model of (2) is as follows: /(I)=/>+/>*/>。
Specifically, in a normal case, the power supply frequency of the power grid is in a low-frequency state, and at the moment, voltage fluctuation is small, only current fluctuation needs to be considered, and when an electric element is damaged or other conditions exist, voltage fluctuation can be caused; the voltage fluctuation and the current fluctuation both can damage the electrical element, the circuit can generate heat due to the fluctuation for a long time, the electrical element is damaged and fails, namely, when a certain result is caused by a plurality of reasons or variables, the graph is in a parallel connection-like relationship, namely, the occurrence of any reason or forward variable can lead to the result or variable deviation, and in the case, the mutual influence relationship of the reasons or forward variables needs to be considered; calculating the voltage fluctuation probability by intercepting the voltage change in the T time period, converting the voltage fluctuation probability into the voltage fluctuation frequency, comparing the voltage fluctuation frequency with the power supply frequency of the power grid, and determining the value of the hidden danger occurrence probability; and when voltage fluctuation and current fluctuation occur simultaneously, the occurrence of circuit faults is quickened, and the severity of the circuit faults is high.
Probability of occurrence of hidden troubleAfter the step, there is also provided a step S11 of equipment damage fault level matching:
dividing equipment fault grade into 、/>And/>；
If it is＜/>The equipment failure level is/>；
If it is＜/>＜/>The equipment failure level is/>；
If it is＞/>The equipment failure level is/>。
In particular, when voltage fluctuation and current fluctuation occur simultaneously, malfunction of the circuit is aggravated, equipment malfunction is easily caused, and thus the equipment malfunction class is classified、/>And/>Calculation/>To determine a level of equipment damage failure; wherein/>And/>The value of (2) can be determined according to the length of the circuit or the condition of the electric element affected by the current, and also can be a fixed value/>=/>，/>=/>; The equipment failure level classification table is classified as follows table 3, equipment failure level/>Is minimal and has minimal severity.
TABLE 3 device damage fault classification
The operator can determine the severity according to the level of the equipment damage fault, select the timing of the process, and when the voltage fluctuation and the current fluctuation occur simultaneously, the severity is greater than that of the single fluctuation, and the severity level is higher, so that the countermeasure is different, and the countermeasure can correspond to table 4 below.
TABLE 4 Equipment failure level and countermeasure therefor
The implementation principle of the embodiment 2 of the application is as follows: when voltage fluctuation occurs, the voltage fluctuation probability needs to be acquired, then the voltage fluctuation probability is converted into the voltage fluctuation frequency, then the voltage fluctuation frequency is compared with the power supply frequency of the power grid, whether the voltage fluctuation is interfered or not is determined, then the hidden danger occurrence probability is calculated, the equipment damage fault grade is corresponding, an operator timely processes according to countermeasures after acquiring the equipment damage fault grade, and the occurrence of the situation that the hidden danger is converted into a fault is reduced.
The embodiment of the application also discloses a fault diagnosis system of the distribution room.
Referring to fig. 3, a power distribution room fault diagnosis system includes the following modules:
Database: the circuit is used for storing each detection unit, historical fault data and detection data of each detection unit and information of each electrical element of the circuit; the database can also store the replacement time, service life and specification information of each electrical element, and simultaneously store the installation position and the line model of each electrical element.
An information acquisition module: the output end and the input end are connected with the database and used for bidirectional transmission of information and obtaining the input voltage, the detection current and the rated current of the circuit to form a voltage set and a current set; the information can be obtained through a voltage sensor and a current sensor, and a calculation program is built in and used for calculating rated current according to the information of the electric elements on the circuit.
And a preliminary judgment module: the input end is connected with the output end of the information acquisition module, and a judging program is stored in the input end and used for executing the following judgment: judging the input voltage detected in the c-1 th timeWhether or not to be equal to the input voltage of the c-th detection/>If yes, fault judgment is carried out, if not, the c+1st input voltage and the detection current are obtained through the sensor continuously, and whether the input voltages are equal is judged again.
And a fault judging module: the input end is connected with the output end of the preliminary judgment module, a judgment program is stored in the preliminary judgment module, and after the input voltage is judged to be equal, the risk value is determined: the risk value S is determined as follows:
；
judging whether a fault exists or not by judging whether the risk value is equal to zero, wherein when s=0, outputting a fault result as a normal Z; s= When the fault result is output as the open circuit/>；S=/>And outputting a fault result to be undetermined.
Hidden danger judging module: the input end is connected with the output end of the fault judging module, and a judging program is stored in the input end and used for judging whether hidden danger exists or not, and the judgment of the hidden danger is implemented as follows: judgingWhether the potential hazard Y is equal to zero or not, if so, judging that the potential hazard Y exists; otherwise, executing the integration judgment step.
And the integration judging module is used for: the input end is connected with the output end of the hidden danger judging module, and a judging program is stored in the hidden danger judging module and used for judging whether short circuit or disconnection or hidden danger exists after the hidden danger judgment is executed, and the method is executed as follows: judgingWhether or not the voltage is equal to zero, if not, determining that the voltage is short-circuited/>; If so, the detection current/>, of the c+1th time is obtainedAnd judging whether the signal is zero, if so, judging that the signal is a circuit breaker/>If not, the hidden danger Y can be judged;
The current fluctuation fault probability calculation module is used for: the input end is connected with the integration judging module and the output end of the database and is used for calculating the current fluctuation fault probability, when the current fluctuation fault probability is calculated, the same-voltage current set is firstly obtained and stored in the database, then the current abnormality judgment is carried out, and the equal current number is recorded And total number in same-voltage current set/>; And performs the same-voltage fault probability/>Wherein,/>; Then calculate a plurality of/>To obtain a current ripple fault probability, wherein/>=/>。
Fault risk likelihood ranking module: dividing fault risk probability grades according to electrical element parameters and past fault historical data, and then matching the probability grades according to current fluctuation fault probability; the fault risk possibility grade is divided into three grades of I, II and III; if it is＜/>The fault risk potential grade is I; if/>＜/>＜/>The failure risk potential grade is II; if/>＞/>The failure risk potential rating is iii.
The system also comprises a voltage fluctuation fault probability module and a hidden danger occurrence probability module;
voltage fluctuation fault probability module: the method comprises the steps of recording the number n of times of fluctuating voltage values in a mode of acquiring the voltage values for a plurality of times in a time period T, recording the total number m of times of acquiring the voltage, storing the total number m of times in a database to form a log, and then calculating the probability of voltage fluctuation faults ; Wherein/>。
Hidden danger occurrence probability calculation module: the voltage fluctuation and the current fluctuation simultaneously affect the circuit, and the circuit faults can be caused, the hidden danger occurrence probability calculation model is stored in the hidden danger occurrence probability module, and the hidden danger occurrence probability calculation model is obtained by adopting the following formula:；
in the method, in the process of the invention, Power frequency for power grid,/>The real-time power grid voltage fluctuation frequency is set;
in the method, in the process of the invention, The calculation model of (2) is as follows: /(I)=/>；
In the method, in the process of the invention,The calculation model of (2) is as follows: /(I)=/>+/>*/>。。
Equipment damage fault classification module: dividing equipment damage fault grades according to electrical element parameters and past fault historical data, and then matching the equipment damage fault grades according to hidden danger occurrence probability; wherein the equipment failure is classified into、/>And/>Three stages; if/>＜/>The equipment failure level is/>; If/>＜/>＜/>The equipment failure level is/>; If/>＞/>The equipment failure level is/>。
The implementation principle of the fault diagnosis system of the distribution room of the embodiment of the application is as follows: acquiring new data from a circuit through an information acquisition module and storing the new data in a database, then performing the screening of the same voltage through an execution preliminary judgment module, performing a fault judgment module when the same voltage is met, performing risk value judgment to judge whether a fault exists, performing a hidden danger judgment module to judge hidden danger, and performing integrated judgment to obtain the type of the fault or the hidden danger; and then executing a current fluctuation probability calculation module, calculating the current fluctuation probability, and executing a fault risk probability grading module and matching the probability grades.
After the information is acquired, a voltage fluctuation fault probability module can be executed to acquire the voltage fluctuation fault probability, then a hidden danger occurrence probability module is executed, the hidden danger occurrence probability is calculated by combining the voltage fluctuation probability and the current fluctuation probability, then an equipment damage fault grade classification module is executed, and corresponding equipment damage fault grades are matched according to the hidden danger occurrence probability; and an operator takes corresponding measures according to the fault level, so that hidden danger is reduced and the hidden danger is converted into a fault.
The above embodiments are not intended to limit the scope of the present invention, so: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (10)
1. A fault diagnosis method for a power distribution room is characterized by comprising the following steps of: the method comprises the following steps:
Establishing a database: dividing the distribution room into a plurality of detection units, wherein each detection unit comprises a plurality of electrical elements and is connected through connecting wires to form a circuit, and a sensor for detecting input voltage and detection current is arranged on the circuit;
Information acquisition: the input voltage and the detection current are obtained by a voltage sensor and a current sensor, and a voltage set is formed And current set [/>)The voltage set and the current set are mapped one by one;
preliminary judgment: judging the input voltage detected in the c-1 th time Whether or not to be equal to the input voltage of the c-th detection/>If yes, performing fault judgment, if not, continuously acquiring the (c+1) -th input voltage and the detection current through the sensor, and judging whether the input voltages are equal again;
and (3) fault judgment: judging whether the risk value S is equal to zero, if so, judging that the fault exists preliminarily, and if not, judging that the fault exists;
The risk value S is determined as follows:
；
When s=0, the output fault result is normal; s= Outputting a fault result as open circuit; s=/>And outputting a fault result to be undetermined.
2. The method for diagnosing a fault in an electrical distribution room according to claim 1, wherein:
when the output fault result is undetermined, a hidden danger judging step and an integration judging step are further arranged;
And (5) hidden danger judgment: judging Whether the potential hazards are equal to zero or not, if so, judging that the potential hazards exist; otherwise, executing the integration judgment step;
And (3) integration judgment: judging Whether the potential risk is equal to zero or not, if not, judging the potential risk, and executing short circuit judgment; if so, the detection current/>, of the c+1th time is obtainedAnd whether the current is zero or not is judged, if yes, the current is judged to be open, and if not, the current is judged to be hidden danger.
3. The method for diagnosing a fault in an electrical distribution room according to claim 2, wherein: after the hidden danger is judged, a current fluctuation fault probability calculating step is further arranged:
And (3) obtaining the same pressure: comparing the voltages in the voltage sets to form the same voltage set ，/>Each voltage corresponds to the same voltage current set [/> ], and，/>，/>，...，/>，/>]，[/>，/>，/>，...，/>，/>]，[/>，/>，/>，...，，/>]，...，[/>，/>，/>，...，/>，/>]，[/>，/>，/>，...，/>，/>]；
Judging current abnormality: at voltageLower rated current/>Judging the same-voltage current set [/> ] one by one，/>，/>，...，/>，/>Whether or not to match rated current/>Record equal current number/>And total number in same-voltage current set/>；
The calculation formula of the same-voltage fault probability is as follows:；
The current ripple fault probability calculation formula is as follows: =/>。
4. a method of diagnosing a power distribution room fault as claimed in claim 3, wherein: after the hidden danger is judged, a voltage fluctuation fault probability obtaining step is further arranged:
intercepting the voltage change in the time T in the voltage set, obtaining the frequency n of voltage fluctuation in the limited frequency m, and calculating the probability of the voltage fluctuation ：
Probability of voltage fluctuationThe calculation model of (2) is as follows: /(I)。
5. The method for diagnosing a fault in a power distribution room according to claim 4, wherein: after the step of obtaining the voltage fluctuation fault probability, the hidden danger occurrence probability calculation is also set;
probability of occurrence of hidden trouble The calculation model of (2) is as follows: /(I)；
In the method, in the process of the invention,Power frequency for power grid,/>The real-time power grid voltage fluctuation frequency is set;
in the method, in the process of the invention, The calculation model of (2) is as follows: /(I)=/>；
In the method, in the process of the invention,The calculation model of (2) is as follows: /(I)=/>+/>*/>。
6. A method of diagnosing a power distribution room fault as claimed in claim 3, wherein: dividing fault risk probability grades into I, II and III, and corresponding current fluctuation fault frequency to fault risk probability grade:
If it is ＜/>The fault risk potential grade is I;
If it is ＜/>＜/>The failure risk potential grade is II;
If it is ＞/>The failure risk potential rating is iii.
7. The method for diagnosing a fault in a power distribution room according to claim 5, wherein: probability of occurrence of hidden troubleAfter the step, equipment damage fault level matching is also set:
dividing equipment fault grade into 、/>And/>；
If it is＜/>The equipment failure level is/>；
If it is＜/>＜/>The equipment failure level is/>；
If it is＞/>The equipment failure level is/>。
8. A power distribution room fault diagnosis system for applying the power distribution room fault diagnosis method according to any one of claims 1 to 7, characterized in that: the method comprises the following modules:
database: the circuit is used for storing each detection unit, historical fault data and detection data of each detection unit and information of each electrical element of the circuit;
an information acquisition module: the method comprises the steps of obtaining input voltage, detection current and rated current of a circuit to form a voltage set and a current set;
and a preliminary judgment module: for judging whether the input voltages are equal;
And a fault judging module: after judging that the input voltages are equal, judging whether a fault exists or not by judging whether the risk value is equal to zero or not;
hidden danger judging module: is used for judging whether hidden danger exists or not;
And the integration judging module is used for: the method is used for judging whether short circuit or open circuit or hidden danger exists after the hidden danger judgment is performed;
The current fluctuation fault probability calculation module is used for: the method is used for calculating the current fluctuation fault probability;
fault risk likelihood ranking module: the probability level is matched according to the current ripple fault probability.
9. The electrical room fault diagnosis system of claim 8, wherein: the system also comprises a voltage fluctuation fault probability module and a hidden danger occurrence probability module;
Voltage fluctuation fault probability module: the method is used for calculating the voltage fluctuation fault probability;
Hidden danger occurrence probability module: and calculating the hidden danger occurrence probability based on the current fluctuation fault probability and the voltage fluctuation fault probability.
10. The electrical room fault diagnosis system of claim 9, wherein: the device damage fault classification module is also included;
Equipment damage fault classification module: the method is used for matching equipment damage fault grades according to the occurrence probability of hidden danger.
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