CN109470944B - Fault early warning method for power protection equipment - Google Patents
Fault early warning method for power protection equipment Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a fault early warning method for power protection equipment, which solves the defects of the prior art and comprises the steps of artificially manufacturing a fault incentive of test equipment, acquiring the relation between input current and output current in the process from normal work to fault sign immediately before the fault occurs of the test equipment under the action of the fault incentive, establishing a sign corresponding table of the output current to the input current and temperature, simultaneously recording test sign sound characteristics, and removing the test sound characteristics recorded in the step A after superposing the test sound characteristics and the recorded normal work noise of each power protection equipment to form sign sound characteristics; and B, during the power protection task, detecting input current, output current, working noise and ambient temperature of the power protection equipment, comparing the measured value with the prediction corresponding table obtained in the step A, and if the difference value between the output current and the prediction output current obtained through the prediction corresponding table exceeds a set threshold value, sending out fault early warning.
Description
Technical Field
The invention relates to the technical field of power supply equipment maintenance, in particular to a fault early warning method for power protection equipment.
Background
As more and more large international events take place in china, the power supply guarantee of these events becomes the first task of local power supply units. When the electricity consumption of a user is increased during an activity, the original power supply line and the original power supply equipment need to be checked, and the aged or insufficient power supply equipment and the power supply line need to be replaced in time. During the activity, important power consumption user arranges dual supply usually, and seamless switching's stand-by power supply when there is the trouble in power of the same way, need to maintain trouble circuit and trouble equipment this moment, and the maintenance is accomplished the back again by stand-by power supply switching back to former power supply. However, after a fault occurs, equipment such as a switch, a breaker and a protector needs a certain response time, so that the standby power supply is difficult to ensure to be switched at the first time. If in the active period, the system can give an early warning to the fault in time and switch the standby power supply before the fault occurs, seamless switching can be easily realized, and meanwhile, maintenance personnel can be guided to arrange and maintain in a targeted manner in time, so that the fault arrangement process is avoided, and the equipment maintenance speed is accelerated.
Chinese patent No. CN 105652138A, 2016, 6, 8, A power equipment fault early warning method, includes the following steps: obtaining action quantity information at the moment of power grid fault, namely switching and protecting action information; acquiring action information from a data acquisition and monitoring system and a circuit breaker to obtain the fault time of each action node of a suspected fault element; real-time online judging equipment with faults in the power grid and forming fault brief report information; the transformer substation comprehensively summarizes the switch, the protection action information and the fault brief report information to form transformer substation fault data information; and the dispatching center receives and analyzes the uploaded fault data information, diagnoses the power grid fault equipment in real time by adopting a logic reasoning algorithm, and compares and checks the diagnosis result with the fault diagnosis result of the transformer substation. The invention can acquire the fault information in the power grid equipment in time, shorten the accident handling time and ensure the safe and reliable operation of the power grid, thereby ensuring the safety of the power grid equipment and avoiding the abnormal condition of the power grid. However, the early warning and judgment of the fault still need to be carried out after the fault occurs, and the early warning cannot be carried out in time when the fault is about to occur.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem that an early warning method and system for equipment fault symptoms are lacked in the existing power system is solved. The power protection equipment fault early warning method is provided for collecting and recording fault sign information, comparing the fault sign information with the real-time working state of equipment, finding fault signs in time and early warning.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a fault early warning method for power protection equipment is suitable for a fault early warning system for the power protection equipment, the fault early warning system for the power protection equipment comprises a current detection device, a sound collector, a temperature sensor, a communication device, a storage, test equipment, a test power supply, a test power consumption unit, an early warning display unit and a microprocessor, the current detection device comprises an input end current detection device and an output end current detection device, the sound collector collects the working noise of the power protection equipment, and the current detection device, the storage, the sound collector, the early warning display unit and the temperature sensor are electrically connected with the microprocessor through the communication device; the test equipment and the power protection equipment are of the same type, and the test power supply and the test power consumption unit are connected with the test equipment; the power protection equipment and the test equipment are both provided with a current detection device, a sound collector and a temperature sensor, and are characterized in that,
the method comprises the following steps:
A) collecting the relation between the input current and the output current of the test equipment in each temperature interval, establishing a prediction corresponding table of the output current to the input current and the temperature, and simultaneously recording the test sound characteristics;
B) artificially manufacturing a fault incentive of the test equipment, acquiring the relation between input current and output current in the fault sign process from normal work to the moment before the fault occurs of the test equipment under the action of the fault incentive, establishing a sign corresponding table of the output current to the input current and the temperature, simultaneously recording test sign sound characteristics, superposing the test sound characteristics and the recorded normal work noise of each power protection equipment, and removing the test sound characteristics recorded in the step A to form sign sound characteristics;
C) during the power protection task, detecting input current, output current, working noise and environment temperature of the power protection equipment, comparing a measured value with the prediction corresponding table obtained in the step A, and if the difference value between the output current and the prediction output current obtained through the prediction corresponding table exceeds a set threshold value, sending out fault early warning;
D) comparing the measured value with the symptom corresponding table obtained in the step B, and if the difference value between the output current and the predicted output current obtained through the symptom corresponding table is lower than a set symptom threshold value, sending out a fault early warning and displaying a fault cause;
E) b, comparing the detected working noise with the test sound characteristics obtained in the step A, and if the difference exceeds a set sound threshold, sending out a fault early warning;
F) and C, comparing the detected working noise with the symptom sound characteristics obtained in the step B, and if the difference is lower than a set symptom sound threshold, sending out a fault early warning and displaying a fault cause.
When the equipment is about to break down, the change of the current value and the change of the working noise are always accompanied, and the change rule is different due to the equipment and the fault inducement, so that the fault equipment and the fault type and the inducement can be matched through the change of the current value and the working noise.
The time length of the test sound characteristic which is preferably recorded is equal to the time length of the recorded test symptom sound characteristic, the starting time of the test symptom sound characteristic is at least 5 seconds before the fault inducement of the artificial manufacturing test equipment starts, the time period recorded before the fault inducement of the artificial manufacturing test equipment starts in the test symptom sound characteristic is a verification time period, the difference degree of characteristic values of the verification time period of the test symptom sound characteristic and the starting time period of the test sound characteristic is smaller than a set threshold value, and the step A) is repeated.
Preferably, the recorded duration of the test sound feature is equal to the recorded duration of the test symptom sound feature, the starting time of the test symptom sound feature is at least 5 seconds before the fault inducement of the artificial manufacturing test equipment starts, the period recorded before the fault inducement of the artificial manufacturing test equipment starts when the test symptom sound feature is tested is a verification period, the difference between the verification period of the test symptom sound feature and the characteristic value of the starting time period of the test sound feature is smaller than a set threshold value, and the step A is repeated if the difference is not greater than the set threshold value.
Preferably, the electricity-keeping equipment is a transformer, and the fault inducement factors of the artificial manufacturing test equipment comprise transformer oil deficiency, transformer oil water inflow, transformer oil circulation unsmooth and transformer oil temperature higher than 60 ℃. Insufficient transformer oil, water inflow, unsmooth circulation and temperature rise are common causes of transformer faults.
Preferably, the power-maintaining equipment is a transformer, and the fault inducement of the artificial manufacturing test equipment comprises damage to partial winding insulation, turn-to-turn insulation, silicon steel sheet-to-sheet insulation and insulator moisture. Damage to the insulation layer, if not discovered in a timely manner, can cause a fire or even an explosion in the equipment.
Preferably, the electricity-keeping device is a capacitor, and the fault inducing factor of the artificial manufacturing test device comprises a leakage resistor connected between capacitor plates. Capacitor leakage between the electrodes is a common type of fault in capacitors, and increases power consumption.
Preferably, the calculation formula of the difference between the output current and the predicted output current obtained by the prediction correspondence table is:
Preferably, the calculation formula of the difference between the output current and the predicted output current obtained by the symptom correspondence table is:
The substantial effects of the invention are as follows: the power distribution network fault early warning system can timely find fault signs and early warn, can be disposed and maintained before faults occur, and improves the safety and stability of the power distribution network.
Detailed Description
The following provides a more detailed description of the present invention with reference to specific examples.
A fault early warning method for power protection equipment is suitable for a fault early warning system for the power protection equipment, the fault early warning system for the power protection equipment comprises a current detection device, a sound collector, a temperature sensor, a communication device, a storage, test equipment, a test power supply, a test power consumption unit, an early warning display unit and a microprocessor, the current detection device comprises an input end current detection device and an output end current detection device, the sound collector collects the working noise of the power protection equipment, and the current detection device, the storage, the sound collector, the early warning display unit and the temperature sensor are electrically connected with the microprocessor through the communication device; the test equipment and the power protection equipment are of the same type, and the test power supply and the test power consumption unit are connected with the test equipment; the power protection equipment and the test equipment are both provided with a current detection device, a sound collector and a temperature sensor, and are characterized in that,
the method comprises the following steps:
A) collecting the relation between the input current and the output current of the test equipment in each temperature interval, establishing a prediction corresponding table of the output current to the input current and the temperature, and simultaneously recording the test sound characteristics;
B) artificially manufacturing a fault incentive of the test equipment, acquiring the relation between input current and output current in the fault sign process from normal work to the moment before the fault occurs of the test equipment under the action of the fault incentive, establishing a sign corresponding table of the output current to the input current and the temperature, simultaneously recording test sign sound characteristics, superposing the test sound characteristics and the recorded normal work noise of each power protection equipment, and removing the test sound characteristics recorded in the step A to form sign sound characteristics;
C) during the power protection task, detecting input current, output current, working noise and environment temperature of the power protection equipment, comparing a measured value with the prediction corresponding table obtained in the step A, and if the difference value between the output current and the prediction output current obtained through the prediction corresponding table exceeds a set threshold value, sending out fault early warning;
D) comparing the measured value with the symptom corresponding table obtained in the step B, and if the difference value between the output current and the predicted output current obtained through the symptom corresponding table is lower than a set symptom threshold value, sending out a fault early warning and displaying a fault cause;
E) b, comparing the detected working noise with the test sound characteristics obtained in the step A, and if the difference exceeds a set sound threshold, sending out a fault early warning;
F) and C, comparing the detected working noise with the symptom sound characteristics obtained in the step B, and if the difference is lower than a set symptom sound threshold, sending out a fault early warning and displaying a fault cause.
The recorded duration of the test sound characteristic is equal to the recorded duration of the test symptom sound characteristic, the starting time of the test symptom sound characteristic is at least 5 seconds before the fault inducement of the artificial manufacturing test equipment starts, the time period recorded before the fault inducement of the artificial manufacturing test equipment starts during the test symptom sound characteristic is a verification time period, the difference degree between the verification time period of the test symptom sound characteristic and the characteristic value of the starting time period of the test sound characteristic is smaller than a set threshold value, and the step A is repeated if the difference degree is not greater than the set threshold value.
When the equipment is about to break down, the change of the current value and the change of the working noise are always accompanied, and the change rule is different due to the equipment and the fault inducement, so that the fault equipment and the fault type and the inducement can be matched through the change of the current value and the working noise.
As a recommended example, the electricity-keeping equipment is a transformer, and the fault inducers of the artificial manufacturing test equipment comprise insufficient transformer oil, water inflow of the transformer oil, poor circulation of the transformer oil and the temperature of the transformer oil higher than 60 ℃. Insufficient transformer oil, water inflow, unsmooth circulation and temperature rise are common causes of transformer faults.
As a recommended example, the power protection equipment is a transformer, and the fault inducement of the artificial manufacturing test equipment comprises damage to partial winding insulation, turn-to-turn insulation, silicon steel sheet insulation and insulator moisture. Damage to the insulation layer, if not discovered in a timely manner, can cause a fire or even an explosion in the equipment.
As a preferred embodiment, the electricity keeping device is a capacitor, and the fault inducement of the artificial manufacturing test device comprises a leakage resistor connected between capacitor plates. Capacitor leakage between the electrodes is a common type of fault in capacitors, and increases power consumption.
As a preferred embodiment, the calculation formula of the difference between the output current and the predicted output current obtained by the prediction correspondence table is:
As a preferred embodiment, the calculation formula of the difference between the output current and the predicted output current obtained by the symptom correspondence table is:
The specific steps in the step B) are as follows:
regard as test equipment with the model equipment, insert experimental power and connect experimental power consumption unit, insert power measuring device at distribution equipment input and output, artificially make test equipment's trouble incentive according to the equipment model to gather under the trouble incentive effect, in order to set for the frequency record: in the process from normal work to the fault symptom before the fault occurs, the corresponding relation between the input power and the output power at the same time is established, a symptom corresponding table of the output power to the input power is established, and the corresponding symptom sound characteristics are recorded; or recording corresponding output power to input power by adopting a piecewise function mode to form a symptom function.
Example 2:
the present embodiment is substantially the same as embodiment 1, except that, in step B), a plurality of devices of the same type are used as test devices, a test power supply is connected to the test power consumption unit, a power measurement device is connected to the input end and the output end of the distribution device, a fault cause of the test device is artificially manufactured according to the device type, and the fault cause is collected under the action of the fault cause and recorded at a set frequency: in the process from normal work to the fault symptom before the fault occurs, corresponding relations between input power and output power at the same time are established by each device, a candidate symptom corresponding table of the output power to the input power is established by each device, and a candidate symptom corresponding table with the highest repetition rate and the symptom sound features recorded at the same time are selected as the symptom corresponding table and the symptom sound features recorded at the same time.
Example 3:
the present embodiment is basically the same as embodiment 1, except that in the present embodiment, a plurality of symptom function templates are preset, for example, a front segment is a horizontal function, a fault occurs when a pulse function occurs, and a fault ends when a proportional function is provided; when recording the symptom function of the equipment, the establishment of the symptom function can be completed only by selecting a plurality of recording points with equipment difference as parameters to be supplemented into the symptom function template, and each symptom function template corresponds to one type of electrical equipment. The symptom function template is approximately obtained by big data after high-frequency multi-batch sampling of the electrical equipment. For example, the transformer corresponds to a symptom function template.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (5)
1. A fault early warning method for power protection equipment is suitable for a fault early warning system for the power protection equipment, the fault early warning system for the power protection equipment comprises a current detection device, a sound collector, a temperature sensor, a communication device, a storage, test equipment, a test power supply, a test power consumption unit, an early warning display unit and a microprocessor, the current detection device comprises an input end current detection device and an output end current detection device, the sound collector collects the working noise of the power protection equipment, and the current detection device, the storage, the sound collector, the early warning display unit and the temperature sensor are electrically connected with the microprocessor through the communication device; the test equipment and the power protection equipment are of the same type, and the test power supply and the test power consumption unit are connected with the test equipment; the power protection equipment and the test equipment are both provided with a current detection device, a sound collector and a temperature sensor, and are characterized in that,
the method comprises the following steps:
A) collecting the relation between the input current and the output current of the test equipment in each temperature interval, establishing a prediction corresponding table of the output current to the input current and the temperature, and simultaneously recording the test sound characteristics;
B) artificially manufacturing a fault incentive of the test equipment, acquiring the relation between input current and output current in the fault sign process from normal work to the moment before the fault occurs of the test equipment under the action of the fault incentive, establishing a sign corresponding table of the output current to the input current and the temperature, simultaneously recording test sign sound characteristics, superposing the test sound characteristics and the recorded normal work noise of each power protection equipment, and removing the test sound characteristics recorded in the step A to form sign sound characteristics;
C) during the power protection task, measuring input current, output current, working noise and ambient temperature of the power protection equipment, comparing the measured value with the prediction corresponding table obtained in the step A, and if the difference value between the measured output current and the predicted output current obtained through the prediction corresponding table exceeds a set threshold value, sending out fault early warning;
D) comparing the measured value with the symptom corresponding table obtained in the step B, and if the difference value between the measured output current and the predicted output current obtained through the symptom corresponding table is lower than a set symptom threshold value, sending out a fault early warning and displaying a fault cause;
E) b, comparing the detected working noise with the test sound characteristics obtained in the step A, and if the difference exceeds a set sound threshold, sending out a fault early warning;
F) b, comparing the detected working noise with the symptom sound characteristics obtained in the step B, and if the difference is lower than a set symptom sound threshold, sending out a fault early warning and displaying a fault incentive;
the recorded duration of the test sound characteristic is equal to the recorded duration of the test symptom sound characteristic, the starting time of the test symptom sound characteristic is at least 5 seconds before the fault inducement of the artificial manufacturing test equipment starts, the recorded time interval before the fault inducement of the artificial manufacturing test equipment starts during the test symptom sound characteristic is a verification time interval, the difference degree between the verification time interval of the test symptom sound characteristic and the characteristic value of the starting time interval of the test sound characteristic is smaller than a set threshold value, and the step A is repeated if the difference degree is not greater than the set threshold value;
the calculation formula of the difference value between the output current and the output current obtained by the prediction mapping table is as follows:
2. The method for early warning the failure of the power protection equipment according to claim 1,
the electricity-keeping equipment is a transformer, and fault inducement factors of the artificial manufacturing test equipment comprise insufficient transformer oil, water inflow of the transformer oil, unsmooth circulation of the transformer oil and the temperature of the transformer oil higher than 60 ℃.
3. The method for early warning the failure of the power protection equipment according to claim 1,
the electric power protection equipment is a transformer, and fault inducement of the artificial manufacturing test equipment comprises damage to partial winding insulation, turn-to-turn insulation, silicon steel sheet insulation and insulator moisture.
4. The method for early warning the failure of the power protection equipment according to claim 1,
the electricity-keeping equipment is a capacitor, and the fault inducement of the artificial manufacturing test equipment comprises a leakage resistor connected between capacitor plates.
5. A fault early warning method for power protection equipment is suitable for a fault early warning system for the power protection equipment, the fault early warning system for the power protection equipment comprises a current detection device, a sound collector, a temperature sensor, a communication device, a storage, test equipment, a test power supply, a test power consumption unit, an early warning display unit and a microprocessor, the current detection device comprises an input end current detection device and an output end current detection device, the sound collector collects the working noise of the power protection equipment, and the current detection device, the storage, the sound collector, the early warning display unit and the temperature sensor are electrically connected with the microprocessor through the communication device; the test equipment and the power protection equipment are of the same type, and the test power supply and the test power consumption unit are connected with the test equipment; the power protection equipment and the test equipment are both provided with a current detection device, a sound collector and a temperature sensor, and are characterized in that,
the method comprises the following steps:
A) collecting the relation between the input current and the output current of the test equipment in each temperature interval, establishing a prediction corresponding table of the output current to the input current and the temperature, and simultaneously recording the test sound characteristics;
B) artificially manufacturing a fault incentive of the test equipment, acquiring the relation between input current and output current in the fault sign process from normal work to the moment before the fault occurs of the test equipment under the action of the fault incentive, establishing a sign corresponding table of the output current to the input current and the temperature, simultaneously recording test sign sound characteristics, superposing the test sound characteristics and the recorded normal work noise of each power protection equipment, and removing the test sound characteristics recorded in the step A to form sign sound characteristics;
C) during the power protection task, measuring input current, output current, working noise and ambient temperature of the power protection equipment, comparing the measured value with the prediction corresponding table obtained in the step A, and if the difference value between the measured output current and the predicted output current obtained through the prediction corresponding table exceeds a set threshold value, sending out fault early warning;
D) comparing the measured value with the symptom corresponding table obtained in the step B, and if the difference value between the measured output current and the predicted output current obtained through the symptom corresponding table is lower than a set symptom threshold value, sending out a fault early warning and displaying a fault cause;
E) b, comparing the detected working noise with the test sound characteristics obtained in the step A, and if the difference exceeds a set sound threshold, sending out a fault early warning;
F) b, comparing the detected working noise with the symptom sound characteristics obtained in the step B, and if the difference is lower than a set symptom sound threshold, sending out a fault early warning and displaying a fault incentive;
the recorded duration of the test sound characteristic is equal to the recorded duration of the test symptom sound characteristic, the starting time of the test symptom sound characteristic is at least 5 seconds before the fault inducement of the artificial manufacturing test equipment starts, the recorded time interval before the fault inducement of the artificial manufacturing test equipment starts during the test symptom sound characteristic is a verification time interval, the difference degree between the verification time interval of the test symptom sound characteristic and the characteristic value of the starting time interval of the test sound characteristic is smaller than a set threshold value, and the step A is repeated if the difference degree is not greater than the set threshold value;
the calculation formula of the difference value between the output current and the output current obtained through the symptom correspondence table is as follows:
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| CN102221651B (en) * | 2011-03-11 | 2015-05-27 | 太原理工大学 | Fault on-line diagnosis and early warning method of flameproof dry-type transformer for mine |
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