CN113655321A - Method and device for general investigation of line loss management and terminal - Google Patents

Method and device for general investigation of line loss management and terminal Download PDF

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CN113655321A
CN113655321A CN202111003395.7A CN202111003395A CN113655321A CN 113655321 A CN113655321 A CN 113655321A CN 202111003395 A CN202111003395 A CN 202111003395A CN 113655321 A CN113655321 A CN 113655321A
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line
loss
phase
voltage
fault
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姚伟智
吴震寰
崔苗苗
杨振城
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract

The embodiment of the invention discloses a method and a device for general survey of management line loss and a terminal. The method comprises the steps that load curve data in a metering device loop in a preset time period are obtained; determining line faults and fault types thereof in the metering device loop in a preset time period according to the load curve data; and performing compensation calculation on the management line power loss corresponding to the line fault in the metering device loop in a preset time period according to the load curve data, the fault type and the corresponding preset compensation calculation model. The embodiment avoids the problem that in the line troubleshooting process, the lost electric quantity caused by line loss management needs to depend on a large amount of later-stage manual statistics estimation processing, but the line fault and the type of the line fault in the metering device loop are conveniently and rapidly determined, and the lost electric quantity caused by line loss management is subjected to compensation calculation, so that the line troubleshooting efficiency is improved.

Description

Method and device for general investigation of line loss management and terminal
Technical Field
The embodiment of the invention relates to the technical field of power management, in particular to a method and a device for general survey of management line loss and a terminal.
Background
The rapid development of economy is not always a stable and safe supply of electricity, which becomes an indispensible part of various industry fields. The line loss not only comprises reasonable line loss parts such as the line loss, but also comprises management line loss such as stealing, leakage, mistake and mistake, and the proportion of the management line loss is large. Therefore, the loss reduction must be performed from both the technical loss reduction, which is the basis, and the management loss reduction, which is the key.
In the prior art, in the line troubleshooting process of managing loss reduction work, the lost electric quantity caused by managing line loss is estimated and processed by later manual statistics, which seriously hinders the line troubleshooting efficiency of workers.
Disclosure of Invention
The embodiment of the invention provides a general survey method, a general survey device and a general survey terminal for managing line loss, which are used for conveniently and rapidly determining line faults and fault types in a metering device loop in a line survey process and performing compensation calculation on the lost electric quantity caused by the managing line loss so as to improve the line survey efficiency.
In a first aspect, an embodiment of the present invention provides a method for general survey of a management line loss, where the method for general survey of a management line loss includes:
acquiring load curve data in a metering device loop at a preset time period;
determining line faults and fault types thereof in the metering device loop within the preset time period according to the load curve data;
and performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the metering device loop in the preset time period according to the load curve data, the fault type and a corresponding preset compensation calculation model.
Optionally, the load curve data includes: a load current per phase line and a phase voltage per phase line;
the determining of the line fault and the fault type thereof in the metering device loop within the preset time period according to the load curve data comprises:
when the load current of any phase line in all the phase lines is greater than the starting current of the electric energy meter and the phase voltage of the phase line is less than the rated voltage of the electric energy meter with a preset voltage loss proportion, determining that the phase line has a line fault and the fault type is voltage loss; the starting current of the electric energy meter is related to the rated current of the electric energy meter;
when the phase voltage of each phase line in all the phase lines is greater than the critical voltage of the electric energy meter and the load current of at least one phase line in all the phase lines is greater than the rated current of the electric energy meter with a preset current loss proportion, determining that the phase line with the load current smaller than the starting current of the electric energy meter in all the phase lines has a fault and the fault type is current loss; wherein the critical voltage of the electric energy meter is related to the rated voltage of the electric energy meter.
Optionally, the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within the preset time period; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining that the phase voltage in the fault period of the nth voltage loss of the first phase line is equal to zero;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000021
wherein, UPush a, n＝(Ub,n+Uc,n)/2；
Figure BDA0003236386120000031
WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ub,nFor the phase voltage, U, of the second phase line during the fault of the nth voltage loss of the first phase linec,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000032
for the power factor of the second phase line during an nth loss of voltage fault of the first phase line,
Figure BDA0003236386120000033
for the power factor, T, of the third phase line during the nth loss of voltage of the first phase linenAnd the fault duration of the nth voltage loss of the first phase line is obtained.
Optionally, the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within the preset time period; the load curve data further comprises: the power factor of each phase line, the electric quantity of each phase line and the fault time length of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining phase voltage in a fault period of the nth voltage loss of the first phase line as residual voltage;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000034
wherein, UPush a, n＝(Ub,n+Uc,n)/2；WDisabled person＝∑Wa,n；
WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ub,nFor the phase voltage, U, of the second phase line during the fault of the nth voltage loss of the first phase linec,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000041
for the power factor, W, of the first phase line during the nth loss of voltage faulta,nFor the electric quantity of the first phase line during the fault period of the nth voltage loss, TnAnd the fault duration of the nth voltage loss of the first phase line is obtained.
Optionally, the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to n times of current loss in the preset time period; the load curve data further comprises: the power factor of each phase line and the fault time length of the nth current loss of the first phase line;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000042
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of N times of current loss of the first phase line in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ua,nFor the phase voltage of the first phase line during the fault with the nth current loss, IFlat a, nIs the average value of the load current of the first phase line in a preset normal period,
Figure BDA0003236386120000043
is the average value of the power factor of the first phase line in the preset normal period, TnAnd the fault duration of the nth current loss of the first phase line is obtained.
Optionally, the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line is subjected to voltage loss for n times in the preset time period, and the third phase line is not subjected to the line fault; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining that a vector difference between the phase voltage of the first phase line and the phase voltage of the second phase line is equal to zero;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000044
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, UTweet ab, nFor a derived value of the difference between the vectors of the phase voltages of the first and second phase lines during an nth loss of voltage of the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000051
for the first phase line and the second phase line during the fault period of the nth voltage loss of the first phase lineA derived value of power factor, TnAnd the fault duration of the nth voltage loss of the first phase line is obtained.
Optionally, the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line is subjected to voltage loss for n times in the preset time period, and the third phase line is not subjected to the line fault; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining the vector difference of the phase voltage of the first phase line and the phase voltage of the second phase line as a residual voltage;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000052
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, UTweet ab, nFor a derived value of the difference between the vectors of the phase voltages of the first and second phase lines during an nth loss of voltage of the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000053
for a first power factor, W, of the first phase line and the second phase line during an nth loss of voltage of the first phase lineab,nAnd Tn is the residual voltage of the vector difference between the phase voltage of the first phase line and the phase voltage of the second phase line in the nth voltage loss fault period of the first phase line, and the fault duration of the nth voltage loss of the first phase line is represented by Tn.
Optionally, the metering device in the metering device loop is a three-phase three-wire metering device; the first phase line is subjected to n times of current loss in the preset time period; the load curve data further comprises: the power factor of each phase line and the fault time length of the nth current loss of the first phase line;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure BDA0003236386120000061
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of N times of current loss of the first phase line in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Uab,nIs the vector difference of the phase voltages of the first phase line and the second phase line in the fault period of the nth voltage loss of the first phase line, IFlat a, nIs the average value of the load current of the first phase line in a preset normal period,
Figure BDA0003236386120000062
is the average value of the first power factors of the first phase line and the second phase line in the preset normal period, TnAnd the fault duration of the nth current loss of the first phase line is obtained.
In a second aspect, an embodiment of the present invention further provides a management line loss census apparatus, where the management line loss census apparatus is configured to execute the management line loss census method according to the first aspect; the management line loss census device includes:
the meter reading function module is used for acquiring load curve data in a metering device loop in a preset time period;
the line fault analysis module is used for determining line faults and fault types thereof in the metering device loop in the preset time period according to the load curve data;
and the line fault compensation calculation module is used for performing compensation calculation on the management line power loss corresponding to the line fault in the metering device loop in the preset time period according to the load curve data, the fault type and the corresponding preset compensation calculation model.
In a third aspect, an embodiment of the present invention further provides a management line loss census terminal, where the management line loss census terminal includes: the processor, the wireless shooting module, the data exchange interface and the management line loss census device according to the second aspect;
the management line loss census device is integrated in the processor;
the wireless shooting module is connected with the processor and used for shooting the circuit and the metering device in the metering device loop according to the control signal sent by the processor;
the data exchange interface is connected with the processor; and the management line loss census terminal is in data communication with an external terminal through the data exchange interface.
According to the management line loss census method, the management line loss census device and the management line loss census terminal, load curve data in a metering device loop in a preset time period are obtained; determining line faults and fault types thereof in the metering device loop in a preset time period according to the load curve data; according to the load curve data, the fault type and the corresponding preset compensation calculation model, the management line loss electric quantity corresponding to the line fault in the metering device loop in the preset time period is subjected to compensation calculation.
Drawings
Fig. 1 is a flowchart of a method for general survey of line loss management according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for general investigation of line loss management according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a method for managing line loss census according to an embodiment of the present invention. Referring to fig. 1, the managed line loss census method includes:
and S10, acquiring load curve data in the metering device loop in a preset time period.
In particular, the metering device circuit is, for example, a circuit in which a transformer and an electric energy meter are located, i.e. the metering device is, for example, a transformer and/or an electric energy meter. The load curve data in the metering device loop of the preset time period can be obtained from the electric energy meter. The preset time period can be set according to actual needs. The electric energy meter collects the electric power data once at a set time interval, for example, 15 minutes or 30 minutes, which is not limited in this embodiment. For example, the staff may want to obtain the load curve data in the device loop within 1 month, and the preset time period may be set to 1 month; the load curve data for 1 month includes power data collected by the electric energy meter every 15 minutes for 1 month.
Exemplary, power data includes, but is not limited to, transient data, event logs for metering devices, load curves, transient variable data, event data, timed freeze data, and schedule data. The instantaneous data includes instantaneous voltage, instantaneous current, instantaneous active power, instantaneous reactive power, instantaneous power factor and the like. The event records of the metering device are, for example, pressure loss and flow loss fault records of the metering device. The voltage loss and current loss fault records comprise voltage loss, starting time, ending time, duration and the like of the current loss, and voltage, current, active power, reactive power, power factor, active total electric quantity, reactive total electric quantity and the like during the fault.
And S11, determining the line fault and the fault type thereof in the metering device loop in the preset time period according to the load curve data. Specifically, according to the load curve data, the possible line fault conditions of the checked line in a preset time period are counted and analyzed, and the line fault in the metering device loop and the fault type of the line fault are determined. For example, the metering device has a line fault, and the fault type comprises voltage loss, current loss and the like.
And S12, performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the metering device loop in a preset time period according to the load curve data, the fault type and the corresponding preset compensation calculation model. Specifically, when the line fault is analyzed, the management line loss is shown, and the electric quantity missing from the metering device needs to be subjected to compensation calculation, namely the management line loss electric quantity (namely the electric quantity corresponding to the management line loss or the compensation electric quantity corresponding to the management line loss or the line loss electric quantity caused by the line fault) is subjected to compensation calculation, so that the line loss of the power enterprise is reduced, and the loss of the power enterprise is reduced.
The method for line loss census management provided by this embodiment may be directly executed by a terminal, for example, by the terminal for line loss census management. Illustratively, the line loss census terminal acquires load curve data in a metering device loop in a preset time period, further determining the line fault in the metering device loop in the preset time period and the fault type of the line fault according to the load curve data, and directly carrying out compensation calculation on the management line loss electric quantity in the metering device loop in a preset time period according to the load curve data, the fault type of the line fault and a preset compensation calculation model corresponding to the fault type, thereby avoiding a great deal of work of later-stage manual statistics and estimation processing for the power loss caused by line loss management in the process of line troubleshooting, but the line fault and the fault type in the metering device loop can be conveniently and rapidly determined, and the lost electric quantity caused by line loss management can be subjected to compensation calculation, so that the line troubleshooting efficiency is improved, and the line loss of a power enterprise is reduced.
On the basis of the above embodiments, optionally, the load curve data includes the load current of each phase line and the phase voltage of each phase line. Step S11, determining the line fault and the fault type thereof in the metering device loop within the preset time period according to the load curve data includes: when the load current of any phase line in all the phase lines is greater than the starting current of the electric energy meter and the phase voltage of the phase line is less than the rated voltage of the electric energy meter with a preset voltage loss proportion (for example, the duration time of the situation exceeds the preset voltage loss time), determining that the phase line has a line fault and the fault type is voltage loss; the starting current of the electric energy meter is related to the rated current of the electric energy meter; when the phase voltage of each phase line in all the phase lines is greater than the critical voltage of the electric energy meter and the load current of at least one phase line in all the phase lines is greater than the rated current of the electric energy meter with a preset current loss proportion, determining that the phase line with the load current smaller than the starting current of the electric energy meter in all the phase lines has a fault and the fault type is current loss; wherein the critical voltage of the electric energy meter is related to the rated voltage of the electric energy meter.
Specifically, the power system in which the metering device loop of the present embodiment is located may be, but is not limited to, a three-phase or single-phase power supply system. The electric energy meter starting current may be, but is not limited to, less than or equal to 0.5% of the rated current of the electric energy meter. The rated voltage of the electric energy meter with the preset voltage loss proportion can be, but is not limited to, 78% of the rated voltage of the electric energy meter, namely, the preset voltage loss proportion can be, but is not limited to, 78%. The preset voltage loss time may be, but is not limited to, 1 minute, that is, when the duration of a situation where the load current of any one of the phase lines is greater than the starting current of the electric energy meter and the phase voltage of the phase line is less than the rated voltage of the electric energy meter with the preset voltage loss proportion is greater than 1 minute, it is determined that a line fault occurs on the phase line and the fault type of the phase line is voltage loss.
Generally, an electric energy meter collects power data every 15 minutes; for example, the electric energy meter is not collected in the 0 th minute, the electric energy meter is collected for the first time in the 15 th minute, and the electric energy meter is collected for the second time in the 30 th minute, at this time, the electric power data collected for the first time is taken as a representative of the electric power data in the 0 th minute to the 15 th minute, and the electric power data collected for the second time is taken as a representative of the electric power data in the 15 th minute to the 30 th minute, so that when the electric power data collected for the first time is judged to have voltage loss or current loss, the electric power data collected for the 0 th minute to the 15 th minute has voltage loss or current loss, and when the electric power data collected for the second time is judged to have voltage loss or current loss, the electric power data collected for the 15 th minute to the 30 th minute has voltage loss or current loss.
The critical voltage of the electric energy meter is the lowest voltage at which the electric energy meter can start to work and is 60% of the rated voltage of the electric energy meter. The preset current loss ratio may be, but is not limited to, 5%, that is, the rated current of the electric energy meter with the preset current loss ratio may be, but is not limited to, 5% of the rated current of the electric energy meter. For example, for three-phase power, the power loss is determined when the three-phase voltage is greater than the critical voltage of the electric energy meter, any one or two phases of the three-phase current are less than the starting current, and the load current of the other phases is greater than 5% of the rated current of the electric energy meter. It should be noted that the starting current of the electric energy meter, the rated current of the electric energy meter, the preset voltage loss ratio, the rated voltage of the electric energy meter, the preset voltage loss time, the critical voltage of the electric energy meter, and the preset current loss ratio in this embodiment may all be stored in the management line loss census terminal in advance, or may be directly obtained from the electric energy meter on the spot by the management line loss census terminal.
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within a preset time period; the load curve data also comprises a power factor of each phase line, electric quantity of each phase line and fault duration of the nth voltage loss of the first phase line (the fault duration of the nth voltage loss or current loss is equal to a set time interval of electric power data collected by the electric energy meter, such as 15 minutes or 30 minutes, and the like); the power factor, the electric quantity, the voltage (i.e. the phase voltage) and the current (i.e. the load current) of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line as well as the power factor, the electric quantity, the voltage and the current of the third phase line can be set during the fault period (the fault period is equal to the set time interval for the electric energy meter to collect the electric power data, such as 15 minutes or 30 minutes). Based on this, after step S11, determining that the phase line has a line fault and the fault type is a voltage loss, the method further includes: the phase voltage in the fault period of the nth voltage loss of the first phase line is determined to be equal to zero, for example, the A-phase is judged to be completely voltage loss (namely Ua is equal to 0) and no residual voltage exists. In contrast, step S12, performing compensation calculation on the management line power loss amount corresponding to the line fault within the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000111
formula (1) is a preset compensation calculation model corresponding to a metering device in a metering device loop being a three-phase four-wire metering device and a first phase line having n times of total voltage loss within a preset time period. WPursuingAnd compensating the electric quantity corresponding to the management line loss of the first phase line with the voltage loss for n times in a preset time period. The first phase line has n times of total voltage loss, and the power factor of the first phase line in the fault period of the n times of total voltage loss cannot be obtained, so that the average value of the sum of the power factor of the second phase line and the power factor of the third phase line in the same time period in the fault period of the n times of total voltage loss of the first phase line needs to be used as a power factor parameter for performing compensation calculation on the first phase line; the phase voltage of the first phase line in the fault period of n times of total voltage loss can not be acquired, so that the average value of the sum of the phase voltage of the second phase line and the phase voltage of the third phase line in the same period is used as the voltage parameter for performing compensation calculation on the first phase line, and the phase voltage of the first phase line is zero, so that the electric quantity of the first phase line is less measured in the fault period in the preset period.
Wherein, UPush a, nA derived value of the phase voltage during a fault period when the nth voltage loss occurs for the first phase line; u shapePush a, n＝(Ub,n+Uc,n)/2；
Figure BDA0003236386120000121
A derived value of the power factor during a fault period in which the nth voltage loss occurs for the first phase line;
Figure BDA0003236386120000122
n is the multiplying power of the metering loop in the metering device loop (such as the multiplying power of a transformer, which can be stored in a terminal in advance or obtained from the transformer on site by the terminal), Ub,nFor the phase voltage, U, of the second phase line during the fault of the nth voltage loss of the first phase linec,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000123
the power factor of the second phase line during the nth loss of voltage of the first phase line,
Figure BDA0003236386120000124
for the power factor, T, of the third phase line during the nth loss of voltage of the first phase linenAnd (4) the fault time length of the nth voltage loss of the first phase line is equal to the time interval set when the electric energy meter collects the electric power data, such as 15 minutes or 30 minutes.
In summary, according to the load curve data and the formula (1), the electric quantity required to be compensated and calculated when the first phase line of the three-phase four-wire metering device is subjected to full voltage loss in the preset time period can be directly, conveniently and rapidly calculated. In this embodiment, the first phase line may be an a phase, a B phase, or a C phase when the three-phase four-wire metering device meters, the corresponding second phase line is the B phase, the C phase, or the a phase, and the corresponding third phase line is the C phase, the a phase, or the B phase, which is not limited in this embodiment.
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within a preset time period; the load curve data also comprises a power factor of each phase line, the electric quantity of each phase line and the fault duration of the nth voltage loss of the first phase line; the power factor, the electric quantity, the voltage and the current of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line and the power factor, the electric quantity, the voltage and the current of the third phase line in the fault period of the nth voltage loss of the first phase line can be realized. Based on this, after step S11, determining that the phase line has a line fault and the fault type is a voltage loss, the method further includes: the phase voltage in the fault period of the nth voltage loss of the first phase line is determined as a residual voltage, and for example, it is determined that the phase a is not fully voltage-loss (namely, Ua ≠ 0) and the residual voltage exists. In contrast, step S12, performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000131
and the formula (2) is a preset compensation calculation model corresponding to the metering device in the metering device loop which is a three-phase four-wire metering device and the first phase line when the partial voltage loss occurs n times in a preset time period. The nth incomplete voltage loss of the first phase line can be used for reading the power factor of the first phase line during the fault period as a power factor parameter for compensation calculation.
Wherein, WPursuingAnd compensating the electric quantity corresponding to the management line loss of the first phase line subjected to voltage loss for n times in the preset time period. U shapePush a, nA derived value of the phase voltage during a fault period when the nth voltage loss occurs for the first phase line; u shapePush a, n＝(Ub,n+Uc,n)/2；WDisabled person＝∑Wa,n(ii) a N is the multiplying power of the metering loop in the metering device loop, Ub,nFor the phase voltage, U, of the second phase line during the fault of the nth voltage loss of the first phase linec,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000141
for the first phase line under the nth voltage lossPower factor during fault, Wa,nThe electric quantity (namely residual electric quantity) of the first phase line in the fault period of the nth voltage lossnAnd the fault time length of the nth voltage loss of the first phase line is obtained.
In summary, according to the load curve data and the formula (2), the electric quantity required to be compensated and calculated when the first phase line of the three-phase four-wire metering device is subjected to incomplete voltage loss within the preset time period can be directly, conveniently and quickly calculated.
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-phase four-wire metering device; n times of current loss of the first phase line in a preset time period, for example, phase A current loss, Ia is approximately equal to 0; the load curve also comprises a power factor of each phase line, the electric quantity of each phase line and the fault duration of the nth current loss of the first phase line; the power factor, the electric quantity, the voltage and the current of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line and the power factor, the electric quantity, the voltage and the current of the third phase line in the fault period of the nth voltage loss of the first phase line can be realized. In contrast, step S12, performing compensation calculation on the management line power loss amount corresponding to the line fault within the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000142
and the formula (3) is a preset compensation calculation model corresponding to the metering device in the metering device loop being a three-phase four-wire metering device and the first phase line having n times of current loss in a preset time period. That is, when the user uses electricity, the electric energy meter detects that the phase current of the first phase line is approximately 0, and meanwhile, the power factor data of the first phase line during the current loss fault cannot be acquired through the load curve data, so that the mean value data in the period of the latest normal cycle (one week or one month) (that is, in the preset normal cycle) is used as the estimation value to calculate the electric quantity to be supplemented in the fault time period.
Wherein, WPursuingFor the first within the preset time periodThe compensation electric quantity corresponding to the management line loss when the phase line has N times of current loss, N is the multiplying power of the metering loop in the metering device loop, Ua,nFor the phase voltage of the first phase line during the fault with the nth current loss, IFlat a, nIs the average value of the load current of the first phase line in the preset normal period,
Figure BDA0003236386120000151
is the average value of the power factor, T, of the first phase line in a predetermined normal periodnThe fault duration of the nth current loss for the first phase line.
In summary, in this embodiment, the electric quantity to be calculated for compensation when the first phase line in the three-phase four-wire metering device is in a current loss state in a preset time period is conveniently and rapidly calculated according to the load curve data and the formula (3).
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line has voltage loss for n times in a preset time period, and the third phase line has no line fault; the load curve data also comprises a power factor of each phase line, electric quantity of each phase line and fault duration of the first phase line with n times of voltage loss; the power factor, the electric quantity, the voltage and the current of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line and the power factor, the electric quantity, the voltage and the current of the third phase line in the fault period of the nth voltage loss of the first phase line can be realized. Based on this, after step S11, determining that the phase line has a line fault and the fault type is a voltage loss, the method further includes: and determining that the difference between the vector of the phase voltage of the first phase line and the vector of the phase voltage of the second phase line is equal to zero, the difference between the vector of the phase voltage of the first phase line and the vector of the phase voltage under the second phase line is the line voltage between the first phase line and the second phase line, for example, the A phase is failed in a metering device loop and the C phase is normally metered, and the line voltage Uab between the A phase and the B phase of the metering device loop is equal to 0, namely, no residual voltage exists. In contrast, step S12, performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000152
formula (4) is a preset compensation calculation model corresponding to the metering device in the metering device loop being a three-phase three-wire metering device and the first phase wire having n times of phase loss (total voltage loss) in a preset time period and the third phase wire having normal metering. In this case, the line voltage Uab between the first phase line and the second phase line of the metering device circuit is 0, and there is no residual voltage, and the metering device does not meter the electric quantity of the first phase line, so that the electric quantity compensation calculation needs to be performed. Because the first phase line is totally voltage-loss, the electric quantity used by the first phase line is not counted during the fault period, and therefore the electric quantity to be supplemented is the electric quantity used by the first phase line during the voltage-loss fault period.
Wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in a preset time period is obtained, N is the metering loop multiplying power of the metering device loop, and U is the voltage loss of the first phase lineTweet ab, nFor the first and second phase lines, during an nth loss of voltage on the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000161
the method is characterized in that the method is a derivation value of a first power factor of a first phase line and a second phase line in the fault period of the first phase line with the nth voltage loss, and Tn is the fault time length of the first phase line with the nth voltage loss.
The three-phase three-wire two-element three-phase four-wire three-element electric energy meter is two wiring methods of the electric energy meter under different power utilization modes, the three-phase three-wire is a three-phase balanced load, so that only two mutual inductors (two elements) are used, and the three-phase four-wire is a mixed load, so that three mutual inductors (three elements) are used for both three phases and a single phase. A, B, C three-phase lines in the three-phase three-line are connected into two transformers (elements) for load balance, A, B, C are connected with the transformers in pairs, the transformers directly connected with the AB are called as first elements for distinguishing, and the actual power factor is the power factor of line voltage and A-phase current between the AB and is called as a first power factor; the transformer with the CB directly connected is called the second element, and the actual power factor is the power factor of the line voltage between the CB and the C-phase current, and is therefore called the second power factor.
And adopting the line voltage Ucb, n between the third phase line and the second phase line in the same period during the nth voltage loss fault of the first phase line as an estimated value, and U deducing ab, wherein n is Ucb, n. The phase angle between U extrapolated ab, n and Ia, n cannot be obtained
Figure BDA0003236386120000162
That is, the first power factor value of the first element cannot be obtained
Figure BDA0003236386120000163
Push n
Figure BDA0003236386120000171
Therefore, it is necessary to derive the values of the first power factors of the first phase line and the second phase line in the fault period according to the second power factors of the second elements of the third phase line and the second phase line in the same period in the fault period when the nth voltage loss occurs to the first phase line, because of the second power factors of the third phase line and the second phase line
Figure BDA0003236386120000172
Calculating a phase angle between the line voltage Ucb of the third phase line and the second phase line, n and the phase current Ic of the third phase line as
Figure BDA0003236386120000173
Since the three-phase three-wire line voltage corresponds to the phase angle of the current of the corresponding phase, the three-phase three-wire line voltage is a function of the phase angle of the current of the corresponding phase
Figure BDA0003236386120000174
Is also the phase angle between Uextrapolated ab, n and Ia, n
Figure BDA0003236386120000175
In summary, in the present embodiment, the electric quantity calculated by the first phase line in the three-phase three-wire metering device after full voltage loss occurs within the preset time period and the third phase line is normally metered according to the load curve data and the formula (4). In this embodiment, the first phase line may be an a phase, a B phase, or a C phase when the three-phase three-wire metering device meters, the corresponding second phase line is the B phase, the C phase, or the a phase, and the corresponding third phase line is the C phase, the a phase, or the B phase, which is not specifically limited in this embodiment.
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line has voltage loss for n times in a preset time period, and the third phase line has no line fault; the load curve data also comprises a power factor of each phase line, the electric quantity of each phase line and the fault duration of the nth voltage loss of the first phase line; the power factor, the electric quantity, the voltage and the current of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line and the power factor, the electric quantity, the voltage and the current of the third phase line in the fault period of the nth voltage loss of the first phase line can be realized. Based on this, after step S11, determining that the phase line has a line fault and the fault type is a voltage loss, the method further includes: and determining the vector difference of the phase voltage of the first phase line and the phase voltage of the second phase line as a residual voltage, for example, the metering device has a fault in phase A and the metering device has normal phase C, and the line voltage Uab between the metering loop phase A and the metering loop phase B is not equal to 0, namely the residual voltage exists. In contrast, step S12, performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000181
formula (5) is a preset compensation calculation model corresponding to the metering device in the metering device loop being a three-phase three-wire metering device and the first phase wire being open-phase (not totally under-voltage) n times in a preset time period and the third phase wire being normally metered. In this case, the line voltage Uab ≠ 0 between the first phase line and the second phase line of the metering device loop, there is a residual voltage, and the electric quantity measured during the fault period is the electric quantity under the residual voltage, so the electric quantity to be compensated is the electric quantity actually used during the fault period minus the electric quantity measured under the residual voltage.
Wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in a preset time period is obtained, N is the multiplying power of a metering loop in the metering device loop, and U is the multiplying power of the metering loopTweet ab, nFor the first and second phase lines, during an nth loss of voltage on the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure BDA0003236386120000182
for a first power factor, W, of the first phase line and the second phase line during an nth loss of voltage of the first phase lineab,nAnd Tn is the residual voltage of the vector difference between the phase voltage of the first phase line and the phase voltage of the second phase line in the nth voltage loss fault period of the first phase line, and is the fault duration of the nth voltage loss of the first phase line.
In summary, according to the load curve data and the formula (5), the electric quantity which is required to be compensated and calculated by the first phase line in the three-phase three-line metering device when the first phase line is under the incomplete voltage loss in the preset time period and the third phase line is normally metered is conveniently and rapidly calculated.
On the basis of the above embodiments, optionally, the metering device in the metering device loop is a three-phase three-wire metering device; n times of current loss of the first phase line in a preset time period, for example, phase A current loss, Ia is approximately equal to 0; the load curve data also comprises a power factor of each phase line, electric quantity of each phase line and fault duration of the nth current loss of the first phase line; the power factor, the electric quantity, the voltage and the current of the first phase line and the power factor, the electric quantity, the voltage and the current of the second phase line and the power factor, the electric quantity, the voltage and the current of the third phase line in the fault period of the nth voltage loss of the first phase line can be realized. In contrast, step S12, performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the preset time period according to the load curve data, the fault type, and the corresponding preset compensation calculation model includes:
Figure BDA0003236386120000191
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of N times of current loss of the first phase line in a preset time period is obtained, N is the multiplying power of a metering loop in the metering device loop, and U is the multiplying power of the metering loopab,nIs the difference between the vectors of the phase voltages of the first and second phase lines during an nth loss of voltage on the first phase lineFlat a, nIs the average value of the load current of the first phase line in the preset normal period,
Figure BDA0003236386120000192
is the average value of the first power factors of the first phase line and the second phase line in a preset normal period, TnThe fault duration of the nth current loss for the first phase line.
In summary, the present embodiment can conveniently and rapidly calculate the electric quantity to be compensated and calculated when the first phase line in the three-phase three-wire metering device is in a current loss state within a preset time period according to the load curve data and the formula (6).
The embodiment of the invention also provides a management line loss census device, which is used for executing the management line loss census method according to any technical scheme. Fig. 2 is a schematic structural diagram of a device for general investigation of line loss management according to an embodiment of the present invention. Referring to fig. 2, the managed line loss census apparatus 100 includes: and the meter reading function module 10 is used for acquiring load curve data in a metering device loop in a preset time period. And the line fault analysis module 20 is used for determining the line fault and the fault type thereof in the metering device loop in the preset time period according to the load curve data. And the line fault compensation calculation module 30 is configured to perform compensation calculation on the management line loss electric quantity corresponding to the line fault in the metering device loop in a preset time period according to the load curve data, the fault type and the corresponding preset compensation calculation model.
The management line loss census device and the management line loss census method provided by the embodiment of the invention belong to the same invention concept, can realize the same technical effect, and repeated contents are not repeated here.
The embodiment of the invention also provides a general investigation terminal for managing the line loss. The management line loss census terminal comprises a processor, a wireless shooting module, a data exchange interface and the management line loss census device 100 according to any technical scheme. Wherein, the management line loss census device is integrated in the processor; the wireless shooting module is connected with the processor and used for shooting the circuit in the metering device loop and the metering device according to the control signal sent by the processor; the data exchange interface is connected with the processor; and the management line loss census terminal is in data communication with an external terminal through a data exchange interface.
Specifically, the management line loss census device according to any of the above technical solutions may be integrated in a processor of the management line loss census terminal. The management line loss census terminal can read load curve data in a metering device loop through data acquisition modes such as carrier waves, infrared and the like. The data exchange interface is used for connecting an external terminal or external equipment, for example, connecting a USB storage device and a computer, so that the management line loss census terminal can conveniently derive an electric quantity compensation calculation result, and a worker can conveniently process service data. The management line loss census terminal further comprises a display screen, and the display screen is used for displaying the electric power data, the load curve data and the electric quantity compensation calculation result. The management line loss census terminal further comprises a wireless communication module, the wireless communication module comprises a WiFi module exemplarily, the management line loss census terminal is connected with the wireless shooting module in a wireless mode through connecting WiFi signals, and then the management line loss census terminal controls the wireless shooting module to shoot on-site power equipment. The management line loss census terminal can also acquire data such as current attributes and video streams of the wireless shooting module, and then updates a UI (user interface) of a program to display the UI to a user.
The wireless shooting module stretches to the eminence through the bracing piece and inspects and shoots power equipment, and the inspection work that the aerial equipment just can be inspected to the reality staff on the ground.
The wireless shooting module outward appearance is similar with general outdoor shooting camera, and the telescopic link device is installed to the camera bottom, shoots the module and contains wireless bluetooth controller, wiFi module, lithium cell, TF storage card, display screen, camera module. The WiFi module provides the WiFi signal and is used for camera and management line loss general survey terminal wireless connection, and the lithium cell provides the electric energy for the camera, and the TF memory card is used for saving the photo of shooing, and the display screen can look over through the camera and shoot the picture, and the camera is used for scanning the picture of shooing to with the picture passback to terminal system display. The user can enable the management line loss census terminal to send a corresponding instruction to the camera through the control interface of the management line loss census terminal, and the camera takes effect immediately after receiving the data. And then the camera feeds back data to the management line loss census terminal, the management line loss census terminal analyzes the data into readable information through a fixed rule, and a program interface is updated and displayed to a user. Illustratively, the wireless camera module comprises: a telescoping rod, a clamping device, and a camera. The camera adopts the camera of shooting anti-shake motion, utilizes clamping device and screw fixation at the head of telescopic link. The camera has the advantages of small size and light weight, thereby improving portability and being convenient for lifting the camera in a labor-saving manner during working. The telescopic link adopts scalable bar-shaped electroscope, and whether detection circuitry or equipment the electric leakage trouble appears also supports the eminence shooting power equipment with the camera as the bracing piece simultaneously. According to the embodiment, the power equipment at a high place can be inspected on site, and the states of the power equipment can be observed and shooting and evidence obtaining can be realized. The instrument has the advantages that functions of collecting power data, taking pictures to obtain evidences, storing inspection information and the like during high-altitude power concealed line inspection are achieved, the problem of safe and quick discovery of operators is facilitated, and the inspection efficiency of the high-altitude concealed line problem can be effectively improved.
At present, an instrument for performing field data collection statistical analysis for power overhead concealed line faults and an instrument for performing missing electric quantity compensation calculation for the line faults do not exist, general inspection shooting equipment is not wirelessly connected to an operation terminal, unification of camera collected image information and terminal collected data is achieved, the mode that a camera is operated wirelessly to collect high-altitude power equipment information and the data of the overhead lines are collected on the field is achieved, and working efficiency and safety inspection level of personnel are improved.
According to the embodiment, the power data are collected on site, fusion analysis can be performed according to the system line fault analysis algorithm module, the problem that line faults possibly exist in the inspection line can be analyzed accurately, and the field inspection efficiency of workers is greatly improved.
According to the embodiment, for the metering equipment with the line fault problem in the inspection, the load curve data of the ammeter is collected, the overhead line inspection data collection system collects comprehensive analysis of power parameter information through load curve recording and field inspection, the missing power to be supplemented can be accurately and quickly calculated through the missing power calculation model, the traditional manual supplementing accounting is converted into intelligent accounting, the burden of workers is greatly reduced, and the working efficiency is improved.
The load curve data that this embodiment can the on-the-spot collection trouble metering device to accurate, the quick calculation of type according to the trouble reachs the electric quantity that needs to chase after mend, can effectively solve staff in the past when breaking down, the formula is complicated and numerous, and manual calculation work load is huge, and the inefficiency problem can be fast, the accurate electric quantity that needs chase after mend of calculating, has greatly improved work efficiency, avoids the calculation error of human factor.
This embodiment has proposed to adopt the insulator spindle to support and has shot the device, and shoot the device and can pass through wifi and be connected with the terminal for the operation personnel stand and also can inspect the power equipment of eminence in the low department, have made things convenient for their witnessed inspections and have effectively prevented the safety problem.
The anti-shake camera is adopted in this embodiment, because shake when preventing to gather the image and cause the blurring of image, saves the step that the staff shot again, has avoided the puzzlement of the unable statistical data in the future.
The management line loss census terminal and the management line loss census device provided by the embodiment of the invention belong to the same invention concept, can realize the same technical effect, and repeated contents are not repeated here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method for managing line loss census, comprising:
acquiring load curve data in a metering device loop at a preset time period;
determining line faults and fault types thereof in the metering device loop within the preset time period according to the load curve data;
and performing compensation calculation on the management line loss electric quantity corresponding to the line fault in the metering device loop in the preset time period according to the load curve data, the fault type and a corresponding preset compensation calculation model.
2. The managed line loss screening method of claim 1,
the load curve data includes: a load current per phase line and a phase voltage per phase line;
the determining of the line fault and the fault type thereof in the metering device loop within the preset time period according to the load curve data comprises:
when the load current of any phase line in all the phase lines is greater than the starting current of the electric energy meter and the phase voltage of the phase line is less than the rated voltage of the electric energy meter with a preset voltage loss proportion, determining that the phase line has a line fault and the fault type is voltage loss; the starting current of the electric energy meter is related to the rated current of the electric energy meter;
when the phase voltage of each phase line in all the phase lines is greater than the critical voltage of the electric energy meter and the load current of at least one phase line in all the phase lines is greater than the rated current of the electric energy meter with a preset current loss proportion, determining that the phase line with the load current smaller than the starting current of the electric energy meter in all the phase lines has a fault and the fault type is current loss; wherein the critical voltage of the electric energy meter is related to the rated voltage of the electric energy meter.
3. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within the preset time period; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining that the phase voltage in the fault period of the nth voltage loss of the first phase line is equal to zero;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000021
wherein, UPush a, n＝(Ub,n+Uc,n)/2；
Figure FDA0003236386110000022
WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ub,nFor the phase voltage, U, of the second phase line during the fault of the nth voltage loss of the first phase linec,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure FDA0003236386110000023
for the power factor of the second phase line during an nth loss of voltage fault of the first phase line,
Figure FDA0003236386110000024
for the power factor, T, of the third phase line during the nth loss of voltage of the first phase linenAnd the fault duration of the nth voltage loss of the first phase line is obtained.
4. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to voltage loss for n times within the preset time period; the load curve data further comprises: the power factor of each phase line, the electric quantity of each phase line and the fault time length of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining phase voltage in a fault period of the nth voltage loss of the first phase line as residual voltage;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000031
wherein, UPush a, n＝(Ub,n+Uc,n)/2；WDisabled person＝∑Wa,n；
WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ub,nFault period of nth voltage loss of first phase line for second phase linePhase voltage in between, Uc,nFor the phase voltage of the third phase line during the fault of the nth voltage loss of the first phase line, Ia,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure FDA0003236386110000032
for the power factor, W, of the first phase line during the nth loss of voltage faulta,nFor the electric quantity of the first phase line during the fault period of the nth voltage loss, TnAnd the fault duration of the nth voltage loss of the first phase line is obtained.
5. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-phase four-wire metering device; the first phase line is subjected to n times of current loss in the preset time period; the load curve data further comprises: the power factor of each phase line and the fault time length of the nth current loss of the first phase line;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000033
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of N times of current loss of the first phase line in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Ua,nFor the phase voltage of the first phase line during the fault with the nth current loss, IFlat a, nIs the average value of the load current of the first phase line in a preset normal period,
Figure FDA0003236386110000034
for the first phase line being at the preset positiveAverage value of power factor in constant period, TnAnd the fault duration of the nth current loss of the first phase line is obtained.
6. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line is subjected to voltage loss for n times in the preset time period, and the third phase line is not subjected to the line fault; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining that a vector difference between the phase voltage of the first phase line and the phase voltage of the second phase line is equal to zero;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000041
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, UTweet ab, nFor a derived value of the difference between the vectors of the phase voltages of the first and second phase lines during an nth loss of voltage of the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure FDA0003236386110000042
for a derived value of a first power factor, T, of the first phase line and the second phase line during an nth loss of voltage of the first phase linenFor n-th loss of voltage for the first phase lineThe length of the fault.
7. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-wire three-phase metering device; the first phase line is subjected to voltage loss for n times in the preset time period, and the third phase line is not subjected to the line fault; the load curve data further comprises: the power factor of each phase line and the fault duration of the nth voltage loss of the first phase line;
after determining that the phase line has line fault and the fault type is voltage loss, the method further comprises the following steps: determining the vector difference of the phase voltage of the first phase line and the phase voltage of the second phase line as a residual voltage;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000051
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of the first phase line with N times of voltage loss in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, UTweet ab, nFor a derived value of the difference between the vectors of the phase voltages of the first and second phase lines during an nth loss of voltage of the first phase linea,nFor the load current of the first phase line during the nth loss of voltage fault,
Figure FDA0003236386110000052
for a first power factor, W, of the first phase line and the second phase line during an nth loss of voltage of the first phase lineab,nA residual of a vector difference between the phase voltage of the first phase line and the phase voltage of the second phase line during the nth voltage loss fault of the first phase lineAnd the voltage Tn is the fault duration of the nth voltage loss of the first phase line.
8. The method for line loss screening of claim 2,
the metering device in the metering device loop is a three-phase three-wire metering device; the first phase line is subjected to n times of current loss in the preset time period; the load curve data further comprises: the power factor of each phase line and the fault time length of the nth current loss of the first phase line;
according to the load curve data, the fault type and the corresponding preset compensation calculation model, performing compensation calculation on the management line power loss corresponding to the line fault in the preset time period comprises the following steps:
Figure FDA0003236386110000053
wherein, WPursuingThe compensation electric quantity corresponding to the management line loss of N times of current loss of the first phase line in the preset time period is N, and N is the multiplying power of the metering loop in the metering device loop, Uab,nIs the vector difference of the phase voltages of the first phase line and the second phase line in the fault period of the nth voltage loss of the first phase line, IFlat a, nIs the average value of the load current of the first phase line in a preset normal period,
Figure FDA0003236386110000054
is the average value of the first power factors of the first phase line and the second phase line in the preset normal period, TnAnd the fault duration of the nth current loss of the first phase line is obtained.
9. A managed line loss census apparatus, configured to perform the managed line loss census method of any one of claims 1-8; the management line loss census device includes:
the meter reading function module is used for acquiring load curve data in a metering device loop in a preset time period;
the line fault analysis module is used for determining line faults and fault types thereof in the metering device loop in the preset time period according to the load curve data;
and the line fault compensation calculation module is used for performing compensation calculation on the management line power loss corresponding to the line fault in the metering device loop in the preset time period according to the load curve data, the fault type and the corresponding preset compensation calculation model.
10. A general investigation terminal for managing line loss is characterized by comprising: a processor, a wireless camera module, a data exchange interface and the managed line loss census device of claim 9;
the management line loss census device is integrated in the processor;
the wireless shooting module is connected with the processor and used for shooting the circuit and the metering device in the metering device loop according to the control signal sent by the processor;
the data exchange interface is connected with the processor; and the management line loss census terminal is in data communication with an external terminal through the data exchange interface.
CN202111003395.7A 2021-08-30 2021-08-30 Method and device for general investigation of line loss management and terminal Pending CN113655321A (en)

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