CN117969990A - Line loss analysis method based on solar line loss rate curve characteristics of transformer area - Google Patents
Line loss analysis method based on solar line loss rate curve characteristics of transformer area Download PDFInfo
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Abstract
The invention discloses a line loss analysis method based on a line loss rate curve characteristic of a station area, which comprises the steps of calculating a theoretical line loss rate value of the station area according to a voltage difference between the head end and the tail end of a low-voltage line; obtaining an actual daily line loss rate value of the station area, comparing the actual daily line loss rate value with the calculated theoretical daily line loss rate value of the station area, and judging whether the theoretical daily line loss rate value exceeds a theoretical daily line loss rate threshold value of the station area; if the type of the test is exceeded, a proper checking method is selected according to the type after the test is exceeded. The invention adopts the voltage drop method to calculate the theoretical value of the solar line loss rate of the transformer area, and compared with other algorithms, the theoretical value of the solar line loss rate of the transformer area is more accurate and is easy to realize. The daily line loss rate abnormality of the transformer area is divided into basic types of overlarge, fluctuation, negative and the like, the rest line loss abnormality can be formed by superposition of the three types of abnormality, various reasons for the three types of basic abnormality are summarized, and the correctness of the conclusion is proved by the modes of system and theoretical analysis, low-voltage line loss tester application and the like.
Description
Technical Field
The invention relates to a line loss analysis method based on a solar line loss rate curve characteristic of a transformer area.
Background
Along with the continuous improvement of enterprise lean management level, the low-voltage line loss (hereinafter referred to as the transformer area line loss) management requirement of power supply companies on the public distribution transformer is continuously improved, and the line loss research related documents are more and more. The theoretical value calculation methods of the line loss of the transformer area are numerous, most of the calculation methods are too complex and have low practical level. According to the management experience in recent years, the line loss abnormality of the transformer area is mainly influenced by the following factors: 1. a user side low voltage; 2. the user change relationship is incorrect; 3. metering and collecting deviation or faults; 4. electricity utilization is realized by no meter or a meter winding meter such as electricity theft; 5. the metering device is miswired; 6. the metering and collecting device and the like consume power; 7. line, equipment leakage, etc. Therefore, the reasons for the abnormal line loss of the transformer area are more, the number of low-voltage users under one transformer area is generally more, the number of low-voltage users varies from tens of users to hundreds of users, and part of the low-voltage lines of the transformer area are longer and the wiring is more messy, so that the difficulty for searching the abnormal reasons is very high.
Disclosure of Invention
The invention aims to provide a line loss analysis method based on the characteristic of a daily line loss rate curve of a transformer area, which can effectively solve the problem of high difficulty in finding the reasons of the line loss abnormality of the existing transformer area.
In order to solve the technical problems, the invention is realized by the following technical scheme:
The line loss analysis method based on the solar line loss rate curve characteristic of the station area sequentially comprises the following steps:
S100, calculating a theoretical solar line loss value of the transformer area according to the voltage difference between the head end and the tail end of the low-voltage line;
S200, acquiring an actual daily line loss rate value of the station area, comparing the actual daily line loss rate value with the theoretical daily line loss rate value of the station area calculated in the S100, and judging whether the theoretical daily line loss rate value of the station area exceeds a theoretical daily line loss rate threshold of the station area in the S100;
If the actual daily line loss rate value of the station area is too large and fluctuation exists, starting to check the line electricity stealing condition;
if the actual daily line loss rate value of the station area is too large and stable, starting to check fault equipment;
if the actual solar line loss value of the station area fluctuates, the clock of the concentrator is inconsistent with the clock of the meter, or the gateway meter or the user meter is inconsistent with the clock of the master station;
If the actual solar loss value of the transformer area is smaller than the theoretical solar loss rate threshold value of the transformer area, detecting that the loop screw is loose and poorly contacted, the primary side turn-to-turn short circuit fault of the gateway current transformer is detected by the gateway meter, or the power supply quantity of the network is not counted by the power supply quantity generated by the user.
Preferably, in step S100, according to active conservation of the head and the tail, the power lost by the line at time t of all users in the a-phase of the station is:
U at、Iat in the formula (1), Respectively represent the voltage, current and power factor of the relevant port table of the station area A at the moment t, U ati、Iati and/orRespectively representing the voltage, current and power factor of the ith user meter connected to the phase A of the station area at the moment t;
According to kirchhoff's law of current (without considering current loss on the line):
substituting formula (2) into formula (1) to obtain:
as can be seen from the formula (3), the product of the voltage difference between the head and the tail of the transformer area and the active component of the current of the tail user is the loss of the line generated by the user;
The electric quantity lost on the all-day line of the A phase of the station area is as follows:
N in the formula (4) is the number of data acquisition points in the whole day, the current acquisition system acquires 96 points in the whole day once every 15 minutes, the calculation accuracy is higher as the number of acquisition points is more, and delta W b and delta W c can be obtained in the same way;
The theoretical solar line loss rate of the station area is as follows:
In the formula (5), K is a correction coefficient considering three-phase unbalance, power factor and load factor influence, M is the loss of the metering equipment, and W Feed device is the daily power supply quantity of a station area.
Preferably, in step S200, the theoretical solar line loss rate threshold value of the land is the theoretical solar line loss value x (1+2%).
Preferably, the step of checking the line power theft condition in step S200 includes: s210, any rod hanging terminal in the low-voltage line is compared with a post table of the terminal, and if the difference between the instantaneous power and the hour freezing electric quantity is large, a worker is arranged to check the post table.
Preferably, the step of troubleshooting the fault device in step S200 is: s220, installing a station area line loss tester terminal at the outlet of each gateway device, comparing the sum of the hour and day frozen electric quantity data of each terminal with the gateway metering data, and if the difference is large, determining that the gateway metering device fails.
Compared with the prior art, the invention has the advantages that:
the invention adopts the voltage drop method to calculate the theoretical value of the solar line loss rate of the transformer area, and compared with other algorithms, the theoretical value of the solar line loss rate of the transformer area is more accurate and is easy to realize. The theoretical solar line loss value of the transformer area is calculated, the threshold range is determined by taking the theoretical solar line loss value as a reference, then the abnormal solar line loss rate of the transformer area is divided into basic types of overlarge, fluctuation, negative and the like by comparing the actual solar line loss rate of the transformer area with the threshold, the rest line loss abnormality can be formed by overlapping the three types of abnormality, various reasons for causing the three types of basic abnormality are summarized, and the correctness of the conclusion is proved by the modes of system and theoretical analysis, application of a low-voltage line loss tester and the like. Thereby guiding the line loss management personnel of the transformer area, finding out the reasons of the abnormal solar line loss rate of the transformer area in the shortest time and finishing the treatment.
Drawings
FIG. 1 is a schematic diagram of the "pressure drop method" employed in the present invention;
FIG. 2 is a graph showing the line loss ratio of the actual solar line loss ratio of the transformer area when the value is too large and fluctuation exists;
FIG. 3 is a diagram of an exemplary low voltage line in the case of theft of the line under investigation in the present invention;
FIG. 4 is a graph showing the line loss ratio of the area with excessively large and stable actual daily line loss ratio;
FIG. 5 is a graph showing the line loss ratio of the actual solar line loss value of the transformer area when there is fluctuation;
Fig. 6 is a line loss rate comparison chart when the actual solar loss value of the area is smaller than the theoretical solar loss rate threshold of the area in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The line loss analysis method based on the solar line loss rate curve characteristic of the station area sequentially comprises the following steps:
S100, calculating a theoretical solar line loss value of the transformer area according to the voltage difference between the head end and the tail end of the low-voltage line;
S200, acquiring an actual daily line loss rate value of the station area, comparing the actual daily line loss rate value with the theoretical daily line loss rate value of the station area calculated in the S100, and judging whether the theoretical daily line loss rate value of the station area exceeds a theoretical daily line loss rate threshold of the station area in the S100;
If the actual daily line loss rate value of the station area is too large and fluctuation exists, starting to check the line electricity stealing condition;
if the actual daily line loss rate value of the station area is too large and stable, starting to check fault equipment;
if the actual solar line loss value of the station area fluctuates, the clock of the concentrator is inconsistent with the clock of the meter, or the gateway meter or the user meter is inconsistent with the clock of the master station;
If the actual solar loss value of the transformer area is smaller than the theoretical solar loss rate threshold value of the transformer area, detecting that the loop screw is loose and poorly contacted, the primary side turn-to-turn short circuit fault of the gateway current transformer is detected by the gateway meter, or the power supply quantity of the network is not counted by the power supply quantity generated by the user.
Specifically, as shown in fig. 1, in step S100, according to active conservation of the head and the tail, the power lost on the line at time t of all users in the station a phase is:
U at、Iat in the formula (1), Respectively represent the voltage, current and power factor of the relevant port table of the station area A at the moment t, U ati、Iati and/orRespectively representing the voltage, current and power factor of the ith user meter connected to the phase A of the station area at the moment t;
According to kirchhoff's law of current (without considering current loss on the line):
substituting formula (2) into formula (1) to obtain:
as can be seen from the formula (3), the product of the voltage difference between the head and the tail of the transformer area and the active component of the current of the tail user is the loss of the line generated by the user;
The electric quantity lost on the all-day line of the A phase of the station area is as follows:
N in the formula (4) is the number of data acquisition points in the whole day, the current acquisition system acquires 96 points in the whole day once every 15 minutes, the calculation accuracy is higher as the number of acquisition points is more, and delta W b and delta W c can be obtained in the same way;
The theoretical solar line loss rate of the station area is as follows:
In the formula (5), K is a correction coefficient considering three-phase unbalance, power factor and load factor influence, M is the loss of the metering equipment, and W Feed device is the daily power supply quantity of a station area.
The theoretical value of the solar line loss rate of the transformer area is calculated by utilizing the difference value between the voltage of the public transformer gateway and the voltage of the user meter and the current active component at the position of the user meter. The calculation method does not consider the specific line topology condition of the public transformer to the user any more, ignores the current loss on the line, directly uses the voltage difference between the head and the tail of the low-voltage line as the main basis of theoretical value calculation, has more accurate result, and can effectively reflect the influence of the line voltage drop on the daily line loss rate of the transformer area.
In step S200, it is determined whether the theoretical daily line loss rate threshold of the area exceeds the theoretical daily line loss rate threshold of the area, and in this embodiment, the theoretical daily line loss rate threshold of the area is equal to the theoretical daily line loss value x (1+2%), and the user may determine the threshold range according to the actual line condition.
After the actual solar line loss rate value of the station area exceeds the theoretical solar line loss rate threshold value of the station area, the following conditions exist:
1. If the actual daily line loss rate of the transformer area is too large and has fluctuation, the line electricity stealing condition is checked. The daily line loss rate of the transformer area is often overlarge due to electricity larceny, and certain fluctuation exists in the daily line loss rate of the transformer area under the general condition, and the fluctuation characteristic is that the daily line loss rate of the transformer area is always larger than or near a theoretical value, and the condition that the daily line loss rate of the transformer area is obviously smaller than the theoretical value does not occur. This is mainly caused by two factors, on one hand, the daily electricity stealing amount of the user is generally unstable, on the other hand, the power supply amount of the station area is also different every day, and if the observation time is prolonged, the power supply amount, the sales amount and the electricity stealing amount are generally changed greatly along with the season replacement of the station area, and the fluctuation is more obvious.
In fig. 2, the theoretical value of the solar line loss rate calculated by the area according to the "pressure drop method" is marked below the curve, and the solar line loss rate calculated by the area according to the power supply and sales is marked above the curve. The method has the advantages that before the electricity larceny prevention is carried out for 14 days in 3 months, the solar line loss rate of the station area is obviously larger than a theoretical value and exceeds a specified 2% threshold value interval, and the solar line loss rate is too large and unqualified; after the electricity larceny is stopped for 3 months and 14 days, the solar line loss rate of the district basically fluctuates slightly up and down at the theoretical value, meets the threshold value requirement interval, and is qualified. The method for searching the line loss abnormality by using the line loss tester of the transformer area is briefly described below in combination with the transformer area.
The transformer area line loss tester mainly comprises a current clamp, a voltage clamp, a terminal and the like, wherein the terminal acquires three-phase current and voltage data of a monitoring point through the current clamp and the voltage clamp and calculates other electric quantity data, and the data are transmitted to a master station and a mobile phone program through a wireless public network. And the line loss investigation personnel compares the data with the electric quantity of the public transformer gateway and the electric quantity of each meter, so that the reasons of the line loss abnormality are found.
As shown in fig. 3, the low-voltage line diagram of a certain area is shown, the area has 3 lines, wherein the main line of the eastern village line has 33 gears only on overhead lines, the power supply radius is very large, the conditions of low voltage at the tail end and the like exist, and the theoretical value of the solar line loss rate is larger in fig. 2, so that the problem is accurately reflected. The field wiring is complex, the electricity stealing time is not fixed, the problem cause is difficult to find only through field inspection, and professional equipment such as a transformer area line loss tester and the like are needed.
Under the condition of no suspected electricity stealing point, each terminal of the line loss tester of the transformer area is generally installed at each line outlet, as shown in fig. 3, the measured hour and daily frozen electric quantity and the sum of the meter electric quantity on the corresponding line are compared and calculated, and if the line loss rate is abnormal, the line is indicated to have a problem. The measured line loss rate of the eastern village line of the platform area is abnormally large, and the electric quantity loss is obvious. The sectional measurement is continuously carried out on the village east line by adopting a dichotomy, and the comparison calculation is carried out on the village east line 14 rod hanging terminal and the subsequent section tables 18, 19 and 20 as shown in fig. 3, so that the difference between the instantaneous power and the freezing electric quantity in the time from the previous day 18 to the next day 6 is found to be larger. The line loss investigation personnel can patrol the meter 18, the meter 19 and the meter 20 positioned on the rods of the No. 22, the No. 27 and the No. 33 of the village east line at about 20 night, find that the rod of the No. 27 of the village east line has the electricity larceny behavior of electricity connection before the meter, and recover the line loss of the station area to be normal after the station area is stopped on site at night of 3 months and 14 days.
At present, the electricity larceny mainly comprises two modes, namely a front-meter wiring mode and a phase line shunting mode. Phase line shunt can lead to zero inconsistency of the meter, and the meter is better identified and searched through the system. Whichever electricity stealing mode is adopted, when the daily electricity stealing quantity reaches a certain value, the daily line loss rate of the station area is abnormal, but the characteristic of the daily line loss rate curve is basically consistent, namely the daily line loss rate of the station area is overlarge and has fluctuation, and the condition that the daily line loss rate is obviously smaller than a theoretical value can not occur.
Partial miswiring and stop of a user meter can also lead to less electricity sales, so that the characteristic of a solar line loss rate curve of a station area similar to electricity stealing is shown, but most metering anomalies can be found and treated by collecting abnormal clues of parameters such as system voltage, current and the like.
2. The solar line loss rate of the transformer area is overlarge and stable.
The public transformer gateway metering equipment error or fault can cause the solar line loss rate of the platform area to be overlarge, and the platform area solar line loss rate is generally different from the abnormality caused by electricity larceny (the user equipment does not generate the online electricity), so that the fluctuation of the platform area solar line loss rate is small, and the platform area solar line loss rate can not obviously fluctuate along with the change of the electricity supply and selling quantity. Theoretical analysis is as follows:
when no power generation equipment such as photovoltaic users exists under the transformer area, and the gateway metering error is considered, the power supply quantity of the transformer area is as follows:
W' supply = W supply (1+x%)....................... (6)
In the formula (6), W' Feed device is the daily power supply measured by a gateway table of the platform area, W Feed device is the actual daily power supply of the platform area, x% is the gateway metering error, and the value is determined by the gateway table error and the gateway current transformer error together.
Equation (7) is a relational expression between the measured daily line loss rate η' and the actual daily line loss rate η, and in general, the measurement error x% is small, so the above equation can be simplified as follows:
η′≈η+x％.....................(8)
As can be seen from equation (8), when the metric error of the public transformer gate is considered, the deviation between the measured value and the actual value of the solar line loss rate of the station area is approximately equal to the metric error of the gate. Under the general condition, the gate metering error is more stable under the condition of different power supply and sales; when the low-voltage circuit of the transformer area works under the condition of allowing current-carrying capacity, different power supplies and sales amounts have little influence on the daily line loss rate of the transformer area. Therefore, when the forward error occurs in the closing measurement, the solar line loss rate of the station area is too large and is stable, and the following example is described.
As shown in fig. 4, the solar line loss rate of the background area before and after the replacement of a certain public transformer gate table is compared, and before the replacement of the gate table for 11 months 02, the solar line loss rate of the platform area is obviously larger than a theoretical value and exceeds a prescribed 2% threshold value interval, and the solar line loss rate is overlarge and unqualified; after the 11-month 02-day gateway table is replaced, the daily line loss rate of the area is slightly smaller than the theoretical value, the daily line loss rate is qualified, and in consideration of the problem of electric quantity connection before and after the gateway table is replaced, data abnormality is caused, and in fig. 4, the 11-month 02-day and 11-month 03-day data are removed.
According to the fact that the daily line loss rate is overlarge and stable, the daily line loss rate is abnormal caused by the gateway metering error is preliminarily judged, and fault equipment can be further determined by using the station area line loss tester and the meter calibrator. The method comprises the following specific steps: installing a station area line loss tester terminal at each line outlet, comparing the sum of the hour and day frozen electric quantity data of each terminal with the gateway metering data, and proving that the gateway metering equipment has faults; and further, a meter calibrator is adopted to calibrate the gate meter, the gate meter is found to have about 4% of error, the value is basically consistent with the difference value between the daily line loss rate and the theoretical value before 11 months and 02 days, and the defect that the gate meter fault causes abnormal line loss of No. 3 Jinhuwan and the gate current transformer is normal is indicated.
The fault gate meter is subjected to a functional test, and the fact that under different power factors and different currents, stable metering errors exist in three phases is found, but the metering errors exceed basic error requirements and are disqualified. And then, equipment planning is conducted by a manufacturer, and the reason that the metering error is increased is found to be caused by aging of equipment in the gateway table due to longer service life. And then similar problems are found successively, and the solar line loss rate of the background area of the gateway table is recovered to be normal.
3. The actual solar line loss value of the station area fluctuates. Abnormal clock of gateway meter, user meter or collection equipment can cause abnormal fluctuation of solar line loss rate of the station area, and the solar line loss rate curve is characterized in that: in a period of time, the daily line loss rate of the transformer area can have larger fluctuation above and below a theoretical value, even exceeds a threshold value or has a negative value, so that the daily line loss rate of the transformer area is unqualified; and the observation time is prolonged, and the average value of the solar line loss rate of the transformer area is close to the theoretical value. The following example analysis treatments.
As shown in fig. 5, the solar line loss rate of the background area before and after clock anomaly management of a certain variable acquisition device is compared, the theoretical value of the solar line loss rate calculated by the background area according to the voltage drop method is marked below the curve, and the solar line loss rate calculated by the background area according to the power supply and sales quantity is marked above the curve. The inquiry of the acquisition system finds that the daily electricity quantity of some or all users under 1 concentrator in the platform is abnormal from 11 months to 18 days, and the daily electricity quantity of the users suddenly appears to be 0 or obviously increases, so that the daily line loss rate of the platform is abnormal. After further analysis, the main reason is found that the concentrator clock is inconsistent with the meter clock, and the software cannot effectively identify whether the daily frozen electric quantity is caused by the previous day data or the current day data. After the collector software program is optimized and updated, the daily line loss rate of the station area at the day of 11 months 26 is recovered to be normal, and the average daily line loss rate is 2.73% and is close to the theoretical value in the abnormal period of collecting daily electric quantity at the day of 11 months 18 to 25 months.
When the gateway meter or the user meter is inconsistent with the clock of the main station, the daily frozen electric quantity is wrong, so that a similar daily line loss rate abnormal curve appears, but the total electric quantity is not changed in a period of time, and the daily line loss rate average value is still close to the theoretical value. In this case, the daily line loss rate of the station area can be generally recovered to be normal by system timing.
4. The actual solar loss value of the station area is smaller than the theoretical solar loss rate threshold of the station area. Under the condition that the household transformation relations are consistent, the reasons that the screw loose contact of the gateway meter detection loop is poor, the primary side turn-to-turn short circuit fault of the gateway current transformer or the network power generated by user equipment is not counted into the power supply quantity can cause the power supply quantity of the transformer area to be counted less, so that the solar line loss rate of the transformer area is smaller, and the corresponding solar line loss rate curve is characterized in that: the daily line loss rate of the station area is obviously smaller than a theoretical value, and even has a negative value.
As shown in fig. 6, a certain station is mainly powered by property, and is connected with a plurality of energy feedback elevators, so that a plurality of meters under the station generate reverse electric quantity, and as the station is not a photovoltaic station, no corresponding network electric quantity is added in the power supply quantity of the station, so that the power supply quantity of the station is less. As shown in fig. 6, the daily line loss rate of the area is obviously smaller than the theoretical value before the treatment of day 07 of 4 months, and negative line loss occurs, and the daily line loss rate is unqualified. And adding meter reverse electric quantity into the power supply quantity of the station area from the day 07 of 4 months, and recovering the daily line loss rate of the station area to be normal.
On the premise of consistent user-to-user relationship, the invention compares the actual daily line loss rate of the transformer area with the theoretical daily line loss rate of the transformer area by a voltage drop method, and classifies the abnormal daily line loss rate of the transformer area into three basic types of overlarge, fluctuation and negative according to the comparison condition and the daily line loss rate curve characteristic of the transformer area. Aiming at the condition that the solar line loss rate of a station area is overlarge and has fluctuation, the station area is judged to be caused by electricity stealing or electricity stealing-like factors (such as meter stop-and-go, miswiring and the like); aiming at the situation that the solar line loss rate of the station area is overlarge and stable, judging that the station area is caused by gateway metering errors or faults; aiming at the fluctuation of the daily line loss rate of the station area, the average value of the daily line loss rate is close to the theoretical value, and the clock abnormality of the acquisition equipment, the gateway table or the user meter is judged to be caused; and aiming at the fact that the solar line loss rate of the station area is negative, judging that the network-surfing electric quantity of the user equipment is caused by the fact that the power supply quantity such as the power supply quantity is not counted. And through system and theoretical analysis, the application of the line loss tester of the transformer area proves the correctness of the conclusion. Therefore, the line loss abnormal reasons can be primarily judged according to the daily line loss rate curve characteristics of the station areas, so that line loss management personnel are guided to finish the management of the station areas with abnormal daily line loss rates as soon as possible.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (5)
1. A line loss analysis method based on the characteristic of a solar line loss rate curve of a station area is characterized by comprising the following steps of: the method sequentially comprises the following steps of:
S100, calculating a theoretical solar line loss value of the transformer area according to the voltage difference between the head end and the tail end of the low-voltage line;
S200, acquiring an actual daily line loss rate value of the station area, comparing the actual daily line loss rate value with the theoretical daily line loss rate value of the station area calculated in the S100, and judging whether the theoretical daily line loss rate value of the station area exceeds a theoretical daily line loss rate threshold of the station area in the S100;
If the actual daily line loss rate value of the station area is too large and fluctuation exists, starting to check the line electricity stealing condition;
if the actual daily line loss rate value of the station area is too large and stable, starting to check fault equipment;
if the actual solar line loss value of the station area fluctuates, the clock of the concentrator is inconsistent with the clock of the meter, or the gateway meter or the user meter is inconsistent with the clock of the master station;
If the actual solar loss value of the transformer area is smaller than the theoretical solar loss rate threshold value of the transformer area, detecting that the loop screw is loose and poorly contacted, the primary side turn-to-turn short circuit fault of the gateway current transformer is detected by the gateway meter, or the power supply quantity of the network is not counted by the power supply quantity generated by the user.
2. The line loss analysis method based on the characteristics of the daily line loss rate curve of the station area as set forth in claim 1, wherein: in step S100, according to active conservation at the head and the tail, the power lost on the line at time t of all users in the area a is:
U at、Iat in the formula (1), Respectively represent the voltage, current and power factor of the relevant port table of the station area A at the moment t, U ati、Iati and/orRespectively representing the voltage, current and power factor of the ith user meter connected to the phase A of the station area at the moment t;
According to kirchhoff's law of current (without considering current loss on the line):
substituting formula (2) into formula (1) to obtain:
as can be seen from the formula (3), the product of the voltage difference between the head and the tail of the transformer area and the active component of the current of the tail user is the loss of the line generated by the user;
The electric quantity lost on the all-day line of the A phase of the station area is as follows:
N in the formula (4) is the number of data acquisition points in the whole day, the current acquisition system acquires 96 points in the whole day once every 15 minutes, the calculation accuracy is higher as the number of acquisition points is more, and delta W b and delta W c can be obtained in the same way;
The theoretical solar line loss rate of the station area is as follows:
In the formula (5), K is a correction coefficient considering three-phase unbalance, power factor and load factor influence, M is the loss of the metering equipment, and W Feed device is the daily power supply quantity of a station area.
3. The line loss analysis method based on the characteristics of the daily line loss rate curve of the station area as set forth in claim 1, wherein: in step S200, the theoretical solar line loss rate threshold value of the area is the theoretical solar line loss value x (1+2%).
4. The line loss analysis method based on the characteristics of the daily line loss rate curve of the station area as set forth in claim 1, wherein: the step of checking the line power theft condition in step S200 is:
S210, any rod hanging terminal in the low-voltage line is compared with a post table of the terminal, and if the difference between the instantaneous power and the hour freezing electric quantity is large, a worker is arranged to check the post table.
5. The line loss analysis method based on the characteristics of the daily line loss rate curve of the station area as set forth in claim 1, wherein: the step of troubleshooting the faulty device in step S200 is:
S220, installing a station area line loss tester terminal at the outlet of each gateway device, comparing the sum of the hour and day frozen electric quantity data of each terminal with the gateway metering data, and if the difference is large, determining that the gateway metering device fails.
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