CN109193563B - Current loss fault monitoring method and device based on three-phase three-wire meter equipment - Google Patents
Current loss fault monitoring method and device based on three-phase three-wire meter equipment Download PDFInfo
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- CN109193563B CN109193563B CN201811088568.8A CN201811088568A CN109193563B CN 109193563 B CN109193563 B CN 109193563B CN 201811088568 A CN201811088568 A CN 201811088568A CN 109193563 B CN109193563 B CN 109193563B
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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
- H02H7/005—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 for remote controlled apparatus; for lines connecting such apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The application relates to a method and a device for monitoring a current loss fault based on three-phase three-wire meter equipment. The method comprises the following steps: obtaining various metering data, wherein the metering data comprises current, voltage, total phase power factor and active power; performing initial judgment of current loss according to the metering data, and acquiring primary side maximum current values of the A phase and the C phase when the initial judgment result is in a current loss state; when the difference value of the primary side maximum current values of the A phase and the C phase is larger than a first value, acquiring the primary side maximum current value time of the phase meeting a first preset condition; calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side; and comparing the actual active power of the secondary side with the active power obtained by measuring the secondary side, and determining that the three-phase three-wire meter device has a current loss fault when the actual active power of the secondary side meets a second preset condition. By adopting the method, the accuracy of identifying the current loss fault of the three-phase three-wire meter device can be improved.
Description
Technical Field
The application relates to the technical field of power system monitoring, in particular to a current loss fault monitoring method and device based on three-phase three-wire meter measuring equipment, computer equipment and a storage medium.
Background
With the development of an electric power system, the range of an electric power network is rapidly increased, and the amount of metering data required to be collected by three-phase three-wire meter metering equipment is also increased. When the three-phase three-wire meter device has a current loss fault, unreal data can exist in the acquired metering data, so that huge losses of power enterprises and users are caused.
In the traditional mode, manual investigation is adopted, so that time and labor are wasted, and three-phase three-wire meter metering equipment with a current loss fault cannot be accurately locked; the power monitoring system is interfered by factors such as power utilization randomness, load diversity and the like, and three-phase three-wire meter equipment with a current loss fault cannot be accurately identified. Therefore, how to accurately identify whether the three-phase three-wire meter device has a current loss fault becomes a technical problem to be solved at present.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for monitoring a current loss fault based on a three-phase three-wire meter device, a computer device and a storage medium, which can improve the accuracy of monitoring the current loss fault.
A current loss fault monitoring method based on a three-phase three-wire meter device comprises the following steps:
obtaining various metering data, wherein the metering data comprises current, voltage, total phase power factor and active power;
performing initial judgment of current loss according to the metering data, and acquiring primary side maximum current values of the A phase and the C phase when the initial judgment result is in a current loss state;
when the difference value of the maximum current values of the two primary sides is larger than a first value, acquiring the maximum current value time of the primary sides of the phases meeting a first preset condition;
obtaining the current, the voltage and the total phase power factor of the corresponding secondary side and the measured active power at the moment according to the maximum current value of the primary side;
calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side;
and comparing the actual active power of the secondary side with the active power obtained by measuring the secondary side, and determining that the three-phase three-wire meter metering equipment has a current loss fault when the actual active power of the secondary side meets a second preset condition.
In one embodiment, the method further comprises:
performing initial judgment of current loss according to the metering data, and acquiring primary side maximum current values of the A phase and the C phase when the initial judgment result is in a non-current loss state;
if any one of the two-phase primary side maximum current values is smaller than a second value, returning to the step of obtaining the primary side maximum current value of the phase meeting a first preset condition when the difference value of the two-phase primary side maximum current values is larger than the first value;
otherwise, determining that the three-phase three-wire meter device has no current loss fault.
In one embodiment, the comparing the actual active power of the secondary side with the active power measured by the secondary side includes:
calculating the ratio of the actual active power of the secondary side to the active power obtained by measuring the secondary side;
when the ratio is in a first preset range, a second preset condition is met;
otherwise, determining that the three-phase three-wire meter device has no current loss fault.
In one embodiment, before the initial determination of fluid loss according to the metering data, the method further includes:
filtering the metering data with abnormal secondary side current in the plurality of metering data;
and filtering the metering data loaded as the hot standby equipment in the plurality of metering data.
In one embodiment, the filtering the metering data of the secondary side current abnormality in the plurality of metering data includes:
acquiring an A-phase secondary side instantaneous current value and a C-phase secondary side instantaneous current value;
and when the number of times that any one of the A-phase secondary side instantaneous current value or the C-phase secondary side instantaneous current value is greater than a third value exceeds a second preset range, deleting the corresponding metering data corresponding to the three-phase three-wire meter device from the various metering data.
In one embodiment, the filtering the metering data loaded on the hot standby device in the plurality of metering data includes:
acquiring an A-phase primary side maximum current value and a C-phase primary side maximum current value;
and when the maximum current value of the A-phase primary side and the maximum current value of the C-phase primary side are both smaller than a fourth value, deleting the metering data corresponding to the corresponding three-phase three-wire meter device from the various metering data.
A device for monitoring a current loss fault based on a three-phase three-wire meter device, the device comprising:
the data acquisition module is used for acquiring various metering data, wherein the metering data comprises current, voltage, total phase power factor and active power;
the initial judgment module is used for carrying out initial judgment of the current loss according to the metering data and acquiring the maximum current values of the primary sides of the A phase and the C phase when the initial judgment result is in a current loss state;
the data acquisition module is further used for acquiring the primary side maximum current value time of the phase meeting a first preset condition when the difference value of the two-phase primary side maximum current values is larger than a first value; obtaining the current, the voltage and the total phase power factor of the corresponding secondary side and the measured active power at the moment according to the maximum current value of the primary side;
the power calculation module is used for calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side;
and the secondary judgment module is used for comparing the actual active power of the secondary side with the active power obtained by measuring the secondary side, and when a second preset condition is met, determining that the three-phase three-wire meter metering equipment has a current loss fault.
In one embodiment, the apparatus further comprises:
the initial judgment module is also used for carrying out initial judgment of current loss according to the metering data, and acquiring the maximum current values of the primary sides of the A phase and the C phase when the initial judgment result is in a non-current loss state; if any one of the two-phase primary side maximum current values is smaller than a second value, returning to a data acquisition module;
the secondary judgment module is further used for determining that no current loss fault occurs in the three-phase three-wire meter device when the maximum current values of the two primary sides are both larger than a second value.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the above method when executing the computer program.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above-mentioned method.
According to the current loss fault monitoring method and device based on the three-phase three-wire meter device, the computer device and the storage medium, the obtained multiple metering data are subjected to current loss initial judgment, when the initial judgment result is in a current loss state, the metering data judged to be in the current loss state are further filtered, and when a first preset condition and a second preset condition are met, the current loss fault of the three-phase three-wire meter device is determined. Compared with the traditional mode, after the initial judgment is finished, the difference value of the maximum current values of the two primary sides in the metering data is compared with the actual active power, the current loss fault of the three-phase three-wire meter device is determined, the possibility of misjudgment is effectively avoided, and the accuracy of identifying whether the current loss fault of the three-phase three-wire meter device occurs is improved.
Drawings
FIG. 1 is a schematic flow chart of a current loss fault monitoring method based on a three-phase three-wire meter device in one embodiment;
FIG. 2 is a schematic flow chart of a current loss fault monitoring method based on a three-phase three-wire meter device in another embodiment;
FIG. 3 is a schematic flow chart of a current loss fault monitoring method based on a three-phase three-wire meter device in another embodiment;
FIG. 4 is a block diagram of a current loss fault monitoring device based on a three-phase three-wire meter device in one embodiment;
FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a method for monitoring a current loss fault based on a three-phase three-wire meter device, including the following steps:
The metering data refers to data obtained through recording of three-phase three-wire meter equipment, and the monitoring platform can obtain various metering data from a local database, wherein the various metering data include but are not limited to current, voltage, total phase power factor and active power. The local database can be constructed by a secondary side data list and a marketing system data list. The secondary side data list includes but is not limited to: the user number, the user name, the ammeter asset number, the data acquisition time, the A phase voltage, the C phase voltage, the A phase current value, the C phase current value, the current active power, the current reactive power, the A phase active power, the C phase active power and the total phase power factor corresponding to each set of three-phase three-wire ammeter equipment; marketing system data listings include, but are not limited to: the method comprises the following steps of electric meter asset number, metering mode, wiring mode, current transformer transformation ratio and voltage transformer transformation ratio.
And 104, performing initial judgment of the current loss according to the metering data, and acquiring the primary side maximum current values of the A phase and the C phase when the initial judgment result is in a current loss state.
The monitoring platform acquires primary side maximum current values of an A phase and a C phase in a three-phase three-wire circuit on a check day from the metering data, wherein the check day refers to a data acquisition day of three-phase three-wire meter equipment; then judging whether the acquired primary side maximum current values of the A phase and the C phase are 0 ampere or not, and if the primary side maximum current value of any one of the A phase and the C phase is 0 ampere, judging that the initial judgment result is a current loss state; and if the maximum current values of the primary sides of the A phase and the C phase are both greater than 0 ampere, the initial judgment result is in a non-current loss state.
In one embodiment, when the primary side maximum current value of any one of the phases a and C is continuously smaller than the threshold value within a preset time range, the result of the initial judgment of the platform for the current loss is also in a current loss state.
And 106, when the difference value of the primary side maximum current values of the A phase and the C phase is larger than a first value, acquiring the primary side maximum current value time of the phase meeting a first preset condition.
The monitoring platform performs subtraction operation on the acquired maximum current values on the primary sides of the A phase and the C phase, and takes the absolute value of the operation result as the difference value of the maximum current values on the primary sides of the A phase and the C phase; and comparing the difference value of the primary side maximum current values of the A phase and the C phase obtained by calculation with a first value, wherein the first value is a current value which is preset by a user and is compared with the difference value of the primary side maximum current values of the two phases. When the difference value of the maximum current values of the two primary sides is larger than the first value, the maximum current values of the two primary sides are proved to be not in accordance with the circuit logic, and the possibility of current loss fault exists. For example, when the absolute value of the difference between the primary side current values of the a-phase and the C-phase is greater than 120 amperes, it indicates that there is a possibility of a current loss fault. Acquiring the primary side maximum current value time of the phase meeting a first preset condition, wherein the phase meeting the first preset condition is a phase with the primary side maximum current value being not 0 ampere in the two phases of the A phase and the C phase; the primary-side maximum current value time is a time when the current value is maximum among all the primary-side current data collected within the check day.
In one embodiment, when the difference between the primary side maximum current values of the a-phase and the C-phase is smaller than the first value, it is indicated that the primary side maximum current values of the a-phase and the C-phase conform to the circuit logic, and the initial judgment result of the current loss state is a false judgment, the monitoring platform can determine that the three-phase three-wire meter device has no current loss fault, and the following steps are not performed.
And 108, acquiring the current, the voltage and the total phase power factor of the corresponding secondary side at any moment according to the maximum current value of the primary side and the measured active power.
And the monitoring platform acquires the current, the voltage and the total phase power factor of the secondary side corresponding to the primary side maximum current value time of the phase with the primary side maximum current value not being 0 and the measured active power from the metering data. For example, if the phase with the primary maximum current value not equal to 0 is the a-phase, the monitoring platform obtains the a-phase secondary current, the a-phase secondary voltage, the total phase power factor, and the active power of the a-phase at the time corresponding to the a-phase primary maximum current value, where the active power of the a-phase is the active power of the a-phase measured by the three-phase three-wire meter device.
And step 110, calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side.
The monitoring platform calculates the actual active power of the secondary side through the current, the voltage and the total phase power factor of the secondary side, and the calculation mode can include: actual active power is current voltage total phase power factor/1000.
And 112, comparing the actual active power of the secondary side with the active power obtained by measuring the secondary side, and determining that the three-phase three-wire meter device has a current loss fault when the actual active power of the secondary side meets a second preset condition.
And the monitoring platform compares the actual active power of the secondary side obtained by calculating the current, the voltage and the total phase power factor of the secondary side with the active power obtained by measuring the three-phase three-wire meter equipment, and when the actual active power meets a second preset condition, the three-phase three-wire meter equipment is determined to have a current loss fault. In one embodiment, when the comparison result does not meet the second preset condition, the monitoring platform determines that the three-phase three-wire meter device has no current loss fault.
According to the current loss fault monitoring method based on the three-phase three-wire meter device, besides the initial judgment of the current loss of the obtained various metering data, when the initial judgment result is in the current loss state, the metering data judged to be in the current loss state can be further filtered, the method comprises the steps of comparing the difference value of the maximum current values of the primary sides of the A phase and the C phase, comparing the actual active power of the secondary side with the active power obtained by measuring the secondary side, and when the first preset condition and the second preset condition are met, determining that the current loss fault occurs in the three-phase three-wire meter device. Compared with the traditional mode, after the initial judgment is finished, the result of the initial judgment in the current loss state is screened, the three-phase three-wire meter device which does not have the current loss fault is screened out, the possibility of misjudgment of the final result is effectively avoided, and the accuracy of identifying whether the three-phase three-wire meter device has the current loss fault is improved.
In one embodiment, the monitoring platform may generate the alarm prompt information for the three-phase three-wire meter device determined to have the current loss fault, and the monitoring platform may obtain data related to the three-phase three-wire meter device having the current loss fault from the local database, and generate the alarm prompt information by using the related data. The alarm prompt information can be sent out through text prompt or voice prompt and the like, so that a user can timely know which three-phase three-wire meter devices have current loss faults and timely overhaul the devices, and loss is reduced.
In one embodiment, as shown in fig. 2, the current loss fault monitoring method based on the three-phase three-wire meter device further includes the following steps:
and step 114, acquiring the primary side maximum current values of the A phase and the C phase when the initial judgment result is in the non-current loss state.
And the monitoring platform performs initial current loss judgment on the three-phase three-wire meter device through the metering data, and if the maximum current values of the primary sides of the A phase and the C phase in the three-phase three-wire circuit are both greater than 0 ampere, the initial judgment result shows that the three-phase three-wire meter device is in a non-current loss state. And the monitoring platform continuously judges whether any one of the primary side maximum current values of the A phase and the C phase is smaller than a second value, wherein the second value is a current value which is preset by a user and is used for being compared with the primary side maximum current value. For example, it is determined whether the primary-side maximum current value of any one of the a-phase and the C-phase is less than 5 amperes, and if the primary-side maximum current value of one of the a-phase and the C-phase is less than 5 amperes, the process returns to step 106.
And step 118, determining that no current loss fault occurs in the three-phase three-wire meter device.
When the maximum current values of the primary sides of the A phase and the C phase are both larger than a second value, the monitoring platform can confirm that the three-phase three-wire meter device has no current loss fault. When the monitoring platform initially judges that the three-phase three-wire meter device is in a non-current loss state, the maximum current values of the primary sides of the A phase and the C phase are compared with the second value, so that the current loss fault is eliminated actually, when the monitoring platform initially judges that the current loss is caused, reactive compensation exists in the three-phase three-wire circuit, the maximum current values of the primary sides of the A phase and the C phase in the three-phase three-wire circuit are both larger than 0 ampere, only when the maximum current values of the primary sides of the A phase and the C phase are both larger than the second value, the three-phase three-wire meter device is determined not to have the current loss fault, the current loss fault misjudgment caused by the reactive compensation in the three-phase three-wire circuit is effectively prevented, the three-wire meter device misjudged due to the reactive compensation is prevented from being missed, and the accuracy of the current loss fault.
In one embodiment, the step 112 of comparing the actual active power of the secondary side with the measured active power of the secondary side includes:
and calculating the ratio of the actual active power of the secondary side to the active power obtained by measuring the secondary side, and when the ratio is within a first preset range, conforming to a second preset condition. Otherwise, determining that the three-phase three-wire meter device has no current loss fault.
And the monitoring platform performs division operation on the calculated actual active power of the secondary side and the measured active power of the secondary side to obtain a ratio of the actual active power of the secondary side to the measured active power of the secondary side, and judges whether the ratio is within a first preset range. If the ratio is within the first preset range, the ratio accords with a second preset condition, the condition indicates that the corresponding three-phase three-wire meter device has a current loss fault, and the monitoring platform can determine that the three-phase three-wire meter device has current loss. For example, if the first preset range is 0.8 to 1.2, that is, the actual active power of the secondary side is between 80% and 120% of the measured active power of the secondary side, the second preset condition is met, and it is determined that the three-phase three-wire meter device has a current loss fault. If the ratio is not within the first preset range, it is indicated that no current loss fault exists in the corresponding three-phase three-wire meter device, and the monitoring platform can determine that no current loss fault exists in the three-phase three-wire meter device.
After the data are logically judged and filtered through the difference value of the maximum current values of the primary sides of the A phase and the C phase, whether the actual active power of the secondary side meets the preset condition is further judged, the three-phase three-wire meter equipment corresponding to the actual active power of the secondary side meeting the preset condition can be ensured to be the three-phase three-wire meter equipment with the current loss fault, the metering data which are not identified in the previous step and correspond to the three-phase three-wire meter equipment without the current loss fault are filtered, the three-phase three-wire meter equipment which is finally output is ensured to be the three-phase three-wire meter equipment with the current loss fault, and the accuracy of monitoring the current loss fault is effectively improved.
In an embodiment, before the step 104 of performing the initial current loss judgment according to the metering data, the current loss fault monitoring method based on the three-phase three-wire meter device further includes: as shown in fig. 3, the step of data filtering specifically includes:
and step 302, filtering the metering data with abnormal secondary side current from the various metering data.
And step 304, filtering the metering data loaded as the hot standby equipment in the various metering data.
The monitoring platform filters a large amount of metering data collected by the three-phase three-wire meter metering equipment, and filters out metering data of abnormal secondary side current in the three-phase three-wire circuit and metering data of hot standby equipment loaded by the three-phase three-wire circuit. The hot standby device is a device which can replace the main component under the condition that the system normally operates, and the device is provided with an operating condition, and only some preparation work is needed to replace the main component.
The metering data of the secondary side current abnormity does not need to judge whether the corresponding three-phase three-wire meter equipment has a current loss fault, so the metering data of the secondary side current abnormity can be filtered from various metering data. Although the hot standby equipment has the operation condition, the hot standby equipment does not generate load, so that the circuit with the load as the hot standby equipment cannot generate load, and the current is 0 ampere, but the three-phase three-wire circuit does not have a current loss fault, so that the metering data with the load as the hot standby equipment is filtered from various metering data before the initial judgment of the current loss is carried out according to the metering data.
By filtering the metering data of the secondary side current abnormity and the metering data of the hot standby equipment loaded with the load in various metering data, the misjudgment of the three-phase three-wire meter equipment current loss caused by the secondary side current abnormity and the hot standby equipment is avoided, and the accuracy of monitoring the current loss fault of the three-phase three-wire meter equipment is effectively improved; meanwhile, as the power grid range is rapidly increased along with the development of an electric power system, the metering data acquired by the three-phase three-wire meter device is also increased in a large amount, before the metering data is subjected to initial judgment of current loss, the metering data which influences the initial judgment of current loss and is provided with secondary side current abnormity and load as hot standby equipment is filtered out, the accuracy of monitoring the current loss fault is improved, meanwhile, the operation data of the monitoring platform for initial judgment of current loss is reduced, the operation speed of the initial judgment of current loss is increased, and the working efficiency of the monitoring platform is improved.
In one embodiment, filtering the metrology data for secondary side current anomalies in a plurality of metrology data includes: and acquiring an A-phase secondary side instantaneous current value and a C-phase secondary side instantaneous current value. And when the number of times that any one of the A-phase secondary side instantaneous current value or the C-phase secondary side instantaneous current value is greater than the third value exceeds a second preset range, deleting the corresponding metering data corresponding to the three-phase three-wire meter device from the various metering data. For example, when the number of times that the secondary side instantaneous current value of either the a-phase or the C-phase exceeds 7 amperes exceeds 10 times, or the number of times that exceeds 9 amperes exceeds 3 times, it is determined that the secondary side current data is abnormal. The monitoring platform obtains an A-phase secondary side instantaneous current value and a C-phase secondary side instantaneous current value from a local database, and the secondary side instantaneous current values comprise secondary side current values corresponding to the A-phase and the C-phase at all data acquisition moments on the check day.
And comparing the A-phase secondary side instantaneous current value or the C-phase secondary side instantaneous current value at all data acquisition moments with a third value, wherein the third value is a third current value preset by a user, and when the number of times that the A-phase or C-phase secondary side instantaneous current value exceeds the third value exceeds a second preset range on the check day, judging that the secondary side current data of the corresponding three-phase three-wire meter device is abnormal, so that the metering data corresponding to the corresponding three-phase three-wire meter device is deleted from the metering data, the amount of the metering data processed by the monitoring platform is reduced, and the operation speed and the operation efficiency of the monitoring platform are improved.
In one embodiment, filtering the metering data loaded as the hot spare device among the plurality of metering data includes: an A-phase primary side maximum current value and a C-phase primary side maximum current value are obtained. And when the maximum current value of the A-phase primary side and the maximum current value of the C-phase primary side are both smaller than a fourth value, deleting the metering data corresponding to the corresponding three-phase three-wire meter device from the various metering data.
The monitoring platform acquires an A-phase primary side maximum current value and a C-phase primary side maximum current value from a local database, and compares the A-phase primary side maximum current value and the C-phase primary side maximum current value with a fourth value respectively, wherein the fourth value is a fourth current value preset by a user; and when the maximum current value of the A-phase primary side and the maximum current value of the C-phase primary side are both smaller than a fourth value, judging that the load of the three-phase three-wire circuit is the hot standby equipment. For example, when both the a-phase primary side maximum current value and the C-phase primary side maximum current value are less than 3 amperes, the load is determined as a hot standby device, and all metering data corresponding to the corresponding three-phase three-wire meter device are deleted from the plurality of metering data.
The maximum current value on the primary side of the phase A and the maximum current value on the primary side of the phase C are respectively compared with the fourth value, the metering data of the hot standby equipment loaded with the three-phase three-wire circuit are filtered, and no load exists when the load in the three-phase three-wire circuit is the hot standby equipment, so that the false phenomenon of current loss of the three-phase three-wire meter equipment is formed, the misjudgment of the three-phase three-wire meter equipment is avoided, and the accuracy of current loss fault identification is improved. Meanwhile, before the initial judgment of the loss of the measured data, the measured data loaded on the hot standby equipment is filtered, the data processing of the initial judgment of the loss of the measured data is reduced, the data processing speed of the monitoring platform is increased, and the operation efficiency of the monitoring platform is improved.
It should be understood that although the various steps in the flow charts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 4, there is provided a current loss fault monitoring apparatus based on a three-phase three-wire meter device, including: a data obtaining module 402, an initial determining module 404, a power calculating module 406, and a secondary determining module 408, wherein:
the data obtaining module 402 is configured to obtain various metering data, where the metering data includes current, voltage, total phase power factor, and active power.
The initial determining module 404 is configured to perform initial current loss determination according to the metering data, and obtain a maximum current value of any two primary sides when the initial determination result is a current loss state.
The data obtaining module 402 is further configured to obtain a primary side maximum current value time of a phase meeting a first preset condition when a difference between primary side maximum current values of the a-phase and the C-phase is greater than a first value; and acquiring the current, the voltage and the total phase power factor of the corresponding secondary side at any moment according to the maximum current value of the primary side and the measured active power.
And a power calculating module 406, configured to calculate an actual active power of the secondary side by using the current, the voltage, and the total phase power factor of the secondary side.
And a secondary judgment module 408, configured to compare the actual active power of the secondary side with the active power obtained by measurement of the secondary side, and determine that a current loss fault occurs in the three-phase three-wire meter device when a second preset condition is met.
In one embodiment, the apparatus for monitoring a current loss fault based on a three-phase three-wire meter device further includes:
the initial determining module 404 is further configured to perform initial current loss determination according to the metering data, and obtain primary side maximum current values of the a phase and the C phase when the initial determination result is a non-current loss state; if any one of the primary side maximum current values of the A phase and the C phase is smaller than the second value, returning to the data acquisition module;
the secondary judging module 408 is further configured to determine that no current loss fault occurs in the three-phase three-wire meter device when the primary side maximum current values of the a-phase and the C-phase are both greater than the second value.
In one embodiment, the secondary determining module 408 is further configured to calculate a ratio of an actual active power of the secondary side to a measured active power of the secondary side; when the ratio is within the first preset range, the second preset condition is met; otherwise, determining that the three-phase three-wire meter device has no current loss fault.
In one embodiment, the current loss fault monitoring device based on the three-phase three-wire meter device further includes a data filtering module, configured to filter measurement data with abnormal secondary-side current among multiple measurement data; the metering data loaded as hot spare equipment is filtered among a plurality of metering data.
In one embodiment, the data filtering module is further configured to obtain an a-phase secondary side instantaneous current value and a C-phase secondary side instantaneous current value; and when the number of times that any one of the A-phase secondary side instantaneous current value or the C-phase secondary side instantaneous current value is greater than the third value exceeds a second preset range, deleting the corresponding metering data corresponding to the three-phase three-wire meter device from the various metering data.
In one embodiment, the data filtering module is further configured to obtain an a-phase primary side maximum current value and a C-phase primary side maximum current value; and when the maximum current value of the A-phase primary side and the maximum current value of the C-phase primary side are both smaller than a fourth value, deleting the metering data corresponding to the corresponding three-phase three-wire meter device from the various metering data.
For specific limitations of the current loss fault monitoring apparatus based on the three-phase three-wire meter device, reference may be made to the above limitations of the current loss fault monitoring method based on the three-phase three-wire meter device, and details are not repeated here. The modules in the current loss fault monitoring device based on the three-phase three-wire meter device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 5. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a current loss fault monitoring method based on the three-phase three-wire meter device. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the respective method embodiment as described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A current loss fault monitoring method based on a three-phase three-wire meter device comprises the following steps:
obtaining various metering data, wherein the metering data comprises current, voltage, total phase power factor and active power;
performing initial judgment of current loss according to the metering data, and acquiring primary side maximum current values of the A phase and the C phase when the initial judgment result is in a current loss state;
when the difference value of the primary side maximum current values of the A phase and the C phase is larger than a first value, acquiring the primary side maximum current value time of the phase with the primary side maximum current value not being 0;
obtaining the current, the voltage and the total phase power factor of the corresponding secondary side and the measured active power at the moment according to the maximum current value of the primary side;
calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side;
calculating the ratio of the actual active power of the secondary side to the active power obtained by measuring the secondary side;
when the ratio is within a first preset range, determining that the three-phase three-wire meter device has a current loss fault;
when the initial judgment result is in a non-current loss state, acquiring primary side maximum current values of the A phase and the C phase;
if any one of the primary side maximum current values of the A phase and the C phase is smaller than a second value, returning to the step of obtaining the primary side maximum current value of the phase with the primary side maximum current value not being 0 when the difference value of the primary side maximum current values of the A phase and the C phase is larger than a first value;
otherwise, determining that the three-phase three-wire meter device has no current loss fault.
2. The method of claim 1, wherein after the calculating a ratio of the actual active power on the secondary side to the measured active power on the secondary side, the method further comprises:
and when the ratio is out of the first preset range, determining that no current loss fault occurs in the three-phase three-wire meter device.
3. The method of claim 1, wherein prior to said initial determination of a fluid loss based on said metering data, said method further comprises:
filtering the metering data with abnormal secondary side current in the plurality of metering data;
and filtering the metering data loaded as the hot standby equipment in the plurality of metering data.
4. The method of claim 3, wherein said filtering the secondary side current anomaly measure data from the plurality of measures data comprises:
acquiring an A-phase secondary side instantaneous current value and a C-phase secondary side instantaneous current value;
and when the number of times that any one of the A-phase secondary side instantaneous current value or the C-phase secondary side instantaneous current value is greater than a third value exceeds a second preset range, deleting the corresponding metering data corresponding to the three-phase three-wire meter device from the various metering data.
5. The method of claim 3, wherein filtering the metering data loaded on the hot spare device among the plurality of metering data comprises:
acquiring an A-phase primary side maximum current value and a C-phase primary side maximum current value;
and when the maximum current value of the A-phase primary side and the maximum current value of the C-phase primary side are both smaller than a fourth value, deleting the metering data corresponding to the corresponding three-phase three-wire meter device from the various metering data.
6. A device for monitoring a current loss fault based on a three-phase three-wire meter device is characterized by comprising:
the data acquisition module is used for acquiring various metering data, wherein the metering data comprises current, voltage, total phase power factor and active power;
the initial judgment module is used for carrying out initial judgment of the current loss according to the metering data and acquiring the maximum current values of the primary sides of the A phase and the C phase when the initial judgment result is in a current loss state;
the data acquisition module is further configured to acquire a primary side maximum current value time of a phase of which the primary side maximum current value is not 0 when a difference between the primary side maximum current values of the a phase and the C phase is greater than a first value; obtaining the current, the voltage and the total phase power factor of the corresponding secondary side and the measured active power at the moment according to the maximum current value of the primary side;
the power calculation module is used for calculating the actual active power of the secondary side by using the current, the voltage and the total phase power factor of the secondary side;
the secondary judgment module is used for calculating the ratio of the actual active power of the secondary side to the active power obtained by the measurement of the secondary side; when the ratio is within a first preset range, determining that the three-phase three-wire meter device has a current loss fault;
the initial judgment module is further used for acquiring the primary side maximum current values of the A phase and the C phase when the initial judgment result is in a non-current loss state; if any one of the two primary side maximum current values is smaller than a second value, returning to the primary side maximum current value time step of obtaining the phase with the primary side maximum current value not being 0 when the difference value of the primary side maximum current values of the A phase and the C phase is larger than the first value;
the secondary judgment module is further used for determining that no current loss fault occurs in the three-phase three-wire meter device when the maximum current values of the two primary sides are both larger than a second value.
7. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 5 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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