CN113640731B - Resident household meter voltage misalignment monitoring method for HPLC (high performance liquid chromatography) station area - Google Patents
Resident household meter voltage misalignment monitoring method for HPLC (high performance liquid chromatography) station area Download PDFInfo
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- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
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Abstract
The invention discloses a resident household meter voltage misalignment monitoring method aiming at an HPLC (high performance liquid chromatography) station area, which comprises the steps of obtaining power supply data of the station area to be monitored; selecting a calculation time point of a table area summary table; calculating the reference voltage value of each phase of the station area to be monitored; calculating the voltage range of each phase of the station area to be monitored; and judging the voltage misalignment state of each resident meter under the station area to be monitored. The resident household meter voltage misalignment monitoring method for the HPLC (high performance liquid chromatography) station area provided by the invention adopts the convenient collection data of the HPLC communication in the HPLC communication station area, and can judge whether the resident household meter voltage measurement is misaligned or not by analyzing the background data of the acquisition system without on-site verification, thus being easy to popularize, quick to take effect, high in reliability, good in practicability, simple and convenient.
Description
Technical Field
The invention belongs to the field of electric automation, and particularly relates to a resident household meter voltage misalignment monitoring method aiming at an HPLC (high performance liquid chromatography) platform area.
Background
Along with the development of economic technology and the improvement of living standard of people, electric energy becomes an indispensable secondary energy source in the production and living of people, and brings endless convenience to the production and living of people. Therefore, ensuring stable and reliable supply of electric energy becomes one of the most important tasks of the electric power system.
The electricity consumption and energy metering of users is an important function of the power system. The resident household meters are huge in quantity, and in the long-term operation process, index performance of part of meter components is reduced or damaged, so that the metering is misaligned, and the problem of less metering or more metering of electric quantity occurs. Most residents use less electricity, the line loss of the transformer area is difficult to embody, the resident meter does not have periodic wheel correction, and the hidden trouble exists for a long time. If the electricity quantity is less, the loss is caused for the power supply department; if the electricity is counted more, the loss is caused for the user, and the service complaint and even the large social public opinion are possibly caused. Therefore, a technical means is urgently needed to realize the online monitoring of the metering out-of-tolerance of the resident's household meter.
Metering out-of-tolerance is mainly manifested as out-of-tolerance in voltage or current; for the current, because the gauge collects the current of the live wire and the current of the zero wire, under the condition of normal power consumption, the current of the live wire and the current of the zero wire are the same, so that whether the current measurement is out of tolerance can be judged by comparing the current of the zero wire and the current of the live wire. For voltage, the meter only samples one voltage (three-way voltage is adopted as a three-way meter), reference comparison is not carried out, and whether the voltage exceeds the difference cannot be directly judged.
Monitoring of the voltage out-of-tolerance, the current practice is as follows: firstly, resident household meter voltage is compared with total table voltage of the transformer area, and if the household meter voltage is higher than the total table voltage (eliminating the three-phase imbalance), the situation that the voltage measurement is out of tolerance is indicated. However, the method can only roughly analyze the meter with the meter voltage obviously higher than the total meter voltage, and for the meter with small difference, the measured value can be lower than the total meter voltage and cannot be found due to the relation of line voltage drop even if the measured value of the meter voltage exceeds the positive error range. Meanwhile, for a gauge with a negative error out of tolerance, judgment cannot be performed. Secondly, it is proposed to add a voltage monitoring device to the meter box, and compare the meter voltage in the same meter box with the voltage of the monitoring device to determine whether the meter voltage exceeds the voltage. However, this method requires very accurate correspondence between meters and meter boxes, phase relation, etc., and adds additional investment, and meanwhile, it cannot be judged for a single household meter.
Disclosure of Invention
The invention aims to provide a resident household meter voltage misalignment monitoring method aiming at an HPLC (high performance liquid chromatography) platform area, which has high reliability, good practicability, simplicity and convenience.
The resident household meter voltage misalignment monitoring method for the HPLC station area provided by the invention comprises the following steps:
s1, acquiring power supply data of a station area to be monitored;
s2, selecting a calculation time point from current data of the total table of the station area;
s3, calculating reference voltage values of each phase of the station area to be monitored;
s4, calculating voltage ranges of each phase of the station area to be monitored;
s5, judging the voltage misalignment state of each resident meter under the station area to be monitored according to the voltage range obtained in the step S4.
The step S2 of selecting a calculation time point from the current data of the total table of the station specifically includes the following steps:
A. acquiring three-phase currents of 24 whole points of a total table of the station area in one day;
B. c, calculating the three-phase current average value and the three-phase unbalance of each integral point according to the three-phase current value obtained in the step A;
C. the weight coefficient S of each integral point is calculated by adopting the following formula i ：
In which I ip The three-phase current average value of the ith integral point; i min The minimum value of three-phase current for the ith integer point; i max Maximum value of three-phase current for the ith integer point; α and β are weight coefficients, and α+β=1;
D. the calculation time point of the total table of the areas is selected by adopting the following rule:
firstly, eliminating the integral points with the average value of the three-phase currents larger than 40A;
then, it is judged whether or not there is an integral point where the average value of the three-phase currents is less than 20A:
if the three-phase current average value is smaller than the integral points of 20A and is larger than or equal to 2, selecting two integral points with the minimum three-phase current average value from the integral points with the three-phase current average value smaller than 20A as calculation time points of the total table of the final station area;
if the three-phase current average value is less than the integral point of 20A and only 1 integral point is provided, directly selecting the integral point of which the three-phase current average value is less than 20A; and selecting a weight coefficient S from the rest whole points i The corresponding whole point is the maximum point; two are selected in totalThe whole points are taken as calculation time points of the final total table of the station areas;
if no integral point with the average value of the three-phase currents less than 20A exists, directly selecting a weight coefficient S i Taking two integral points with the maximum value as calculation time points of the total table of the final station area;
if two whole points cannot be selected as the calculation time points of the final total table of the platform area, the method is directly exited.
The step S3 of calculating the reference voltage value of each phase of the station area to be monitored specifically comprises the following steps:
according to the calculation time points of the table area total table selected in the step S2, calculating the reference voltage values of each phase of the table area to be monitored by adopting the following formula:
wherein z has a value of A, B or C; u (U) zp Voltage average value of z phase; u (u) zj At the calculation time point selected in the step S2, the voltage value of the jth resident table of the z phase; max is the operation of removing the maximum value; min is the minimum value.
The step S4 of calculating the voltage range of each phase of the station area to be monitored specifically comprises the following steps:
the voltage range of each phase of the station area to be monitored is calculated by adopting the following formula:
U zU ＝U zp +ZI aj +X
U zL ＝U zp -ZI aj -X
wherein z has a value of A, B or C; u (U) zU The upper voltage boundary of the z phase of the station area to be monitored; u (U) zL The voltage lower boundary of the z phase of the station area to be monitored; u (U) zp The reference voltage value of the z phase of the station area to be monitored, which is obtained in the step S3; z is the line impedance from the middle section of the line to the household meter; i aj A current value at a selected calculation time point for the zone exit z-phase; x is the set meter measurement error.
And step S5, judging the voltage misalignment state of each resident meter under the station area to be monitored according to the voltage range obtained in the step S4, specifically, judging by adopting the following steps:
if the voltage of the resident table t is in the voltage range of the hung phase line, the resident table t is considered to be normal;
if the voltage of the resident's meter t is not in the voltage range of the hung phase line, the resident's meter t is determined to be out of alignment.
The resident household meter voltage misalignment monitoring method for the HPLC (high performance liquid chromatography) station area provided by the invention adopts the convenient collection data of the HPLC communication in the HPLC communication station area, and can judge whether the resident household meter voltage measurement is misaligned or not by analyzing the background data of the acquisition system without on-site verification, thus being easy to popularize, quick to take effect, high in reliability, good in practicability, simple and convenient.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The process flow diagram of the present invention is shown in FIG. 1: the resident household meter voltage misalignment monitoring method for the HPLC station area provided by the invention comprises the following steps:
s1, acquiring power supply data of a station area to be monitored;
s2, selecting a calculated time point from the current data of the total table of the station area; the method specifically comprises the following steps:
A. acquiring three-phase currents of 24 whole points of a total table of the station area in one day;
B. c, calculating the three-phase current average value and the three-phase unbalance of each integral point according to the three-phase current value obtained in the step A;
C. the weight coefficient S of each integral point is calculated by adopting the following formula i ：
In which I ip The three-phase current average value of the ith integral point; i min The minimum value of three-phase current for the ith integer point; i max Is the ithMaximum value of three-phase current of the whole point; α and β are weight coefficients, and α+β=1;
D. the calculation time point of the total table of the areas is selected by adopting the following rule:
firstly, eliminating the integral points with the average value of the three-phase currents larger than 40A;
then, it is judged whether or not there is an integral point where the average value of the three-phase currents is less than 20A:
if the three-phase current average value is smaller than the integral points of 20A and is larger than or equal to 2, selecting two integral points with the minimum three-phase current average value from the integral points with the three-phase current average value smaller than 20A as calculation time points of the total table of the final station area;
if the three-phase current average value is less than the integral point of 20A and only 1 integral point is provided, directly selecting the integral point of which the three-phase current average value is less than 20A; and selecting a weight coefficient S from the rest whole points i The corresponding whole point is the maximum point; two integral points are selected as calculation time points of a final table zone total table;
if no integral point with the average value of the three-phase currents less than 20A exists, directly selecting a weight coefficient S i Taking two integral points with the maximum value as calculation time points of the total table of the final station area;
if two whole points cannot be selected as the calculation time points of the final table zone total table, directly exiting the method;
s3, calculating reference voltage values of each phase of the station area to be monitored; the method specifically comprises the following steps:
according to the calculation time points of the table area total table selected in the step S2, calculating the reference voltage values of each phase of the table area to be monitored by adopting the following formula:
wherein z has a value of A, B or C; u (U) zp Voltage average value of z phase; u (u) zj At the calculation time point selected in the step S2, the voltage value of the jth resident table of the z phase; max is the operation of removing the maximum value; min is the minimum value operation;
in the implementation, two calculation time points are selected, so that two groups of reference voltage values need to be calculated;
s4, calculating voltage ranges of each phase of the station area to be monitored; the method specifically comprises the following steps:
the voltage range of each phase of the station area to be monitored is calculated by adopting the following formula:
U zU ＝U zp +ZI aj +X
U zL ＝U zp -ZI aj -X
wherein z has a value of A, B or C; u (U) zU The upper voltage boundary of the z phase of the station area to be monitored; u (U) zL The voltage lower boundary of the z phase of the station area to be monitored; u (U) zp The reference voltage value of the z phase of the station area to be monitored, which is obtained in the step S3; z is the line impedance from the middle section of the line to the household meter; i aj A current value at a selected calculation time point for the zone exit z-phase; x is a set meter measurement error;
in the specific implementation, two calculation time points are selected, and two groups of reference voltage values are calculated, so that two groups of voltage ranges are also required to be calculated;
s5, judging the voltage misalignment state of each resident table in the to-be-monitored platform area according to the voltage range obtained in the step S4, specifically, judging by adopting the following steps:
if the voltage of the resident table t is in the voltage range of the hung phase line, the resident table t is considered to be normal;
if the voltage of the resident table t is not in the voltage range of the hung phase line, the resident table t is determined to be out of alignment;
in practice, since two sets of voltage ranges are obtained, a specific decision may be:
if the two determinations are carried out, the voltage of the resident household table t is in the voltage range of the hung phase line, and the resident household table t is judged to be normal;
if the voltage of the resident table t is not in the voltage range of the hung phase line, determining that the voltage of the resident table t is not aligned;
if the voltage of the resident table t is judged twice, the resident table t is judged to be normal once within the voltage range of the hung phase line and is not judged to be normal once within the voltage range of the hung phase line.
Claims (2)
1. A resident household meter voltage misalignment monitoring method for an HPLC (high Performance liquid chromatography) station area comprises the following steps:
s1, acquiring power supply data of a station area to be monitored;
s2, selecting a calculated time point from the total current of the station area; the method specifically comprises the following steps:
A. acquiring three-phase currents of 24 whole points of a total table of the station area in one day;
B. c, calculating the three-phase current average value and the three-phase unbalance of each integral point according to the three-phase current value obtained in the step A;
C. the weight coefficient S of each integral point is calculated by adopting the following formula i ：
In which I ip The three-phase current average value of the ith integral point; i min The minimum value of three-phase current for the ith integer point; i max Maximum value of three-phase current for the ith integer point; α and β are weight coefficients, and α+β=1;
D. the calculation time point of the total table of the areas is selected by adopting the following rule:
firstly, eliminating the integral points with the average value of the three-phase currents larger than 40A;
then, it is judged whether or not there is an integral point where the average value of the three-phase currents is less than 20A:
if the three-phase current average value is smaller than the integral points of 20A and is larger than or equal to 2, selecting two integral points with the minimum three-phase current average value from the integral points with the three-phase current average value smaller than 20A as calculation time points of the total table of the final station area;
if the three-phase current average value is less than the integral point of 20A and only 1 integral point is provided, directly selecting the integral point of which the three-phase current average value is less than 20A; and selecting weight coefficients from the rest whole pointsS i The corresponding whole point is the maximum point; two integral points are selected as calculation time points of a final table zone total table;
if no integral point with the average value of the three-phase currents less than 20A exists, directly selecting a weight coefficient S i Taking two integral points with the maximum value as calculation time points of the total table of the final station area;
if two whole points cannot be selected as the calculation time points of the final table zone total table, directly exiting the method;
s3, calculating reference voltage values of each phase of the station area to be monitored; the method specifically comprises the following steps:
according to the calculation time points of the table area total table selected in the step S2, calculating the reference voltage values of each phase of the table area to be monitored by adopting the following formula:
wherein z has a value of A, B or C; u (U) zp Voltage average value of z phase; u (u) zj At the calculation time point selected in the step S2, the voltage value of the jth resident table of the z phase; max is the maximum value; min is the minimum value operation;
s4, calculating voltage ranges of each phase of the station area to be monitored; the method specifically comprises the following steps:
the voltage range of each phase of the station area to be monitored is calculated by adopting the following formula:
U zU ＝U zp +ZI aj +X
U zL ＝U zp -ZI aj -X
wherein z has a value of A, B or C; u (U) zU The upper voltage boundary of the z phase of the station area to be monitored; u (U) zL The voltage lower boundary of the z phase of the station area to be monitored; u (U) zp The reference voltage value of the z phase of the station area to be monitored, which is obtained in the step S3; z is the line impedance from the middle section of the line to the household meter; i aj Calculating a current value for the zone exit z-phase at a calculated point in time for the selected zone summary; x is a set meter measurement error;
s5, judging the voltage misalignment state of each resident meter under the station area to be monitored according to the voltage range obtained in the step S4.
2. The method for monitoring voltage misalignment of resident meters in an HPLC area according to claim 1, wherein the voltage range obtained in step S4 in step S5 is used for determining the voltage misalignment state of each resident meter in the area to be monitored, specifically by the following steps:
if the voltage of the resident table t is in the voltage range of the hung phase line, the resident table t is considered to be normal;
if the voltage of the resident's meter t is not in the voltage range of the hung phase line, the resident's meter t is determined to be out of alignment.
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