CN111984925B - Circuit abnormality positioning method based on loop impedance, storage medium and computing device - Google Patents
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Abstract
The invention discloses a circuit abnormality positioning method, a storage medium and a computing device based on loop impedance, which are used for collecting current and voltage data of a low-voltage transformer area user and a distribution transformer and screening according to set requirements; calculating the distribution probability of loop impedance of all users in a low-voltage transformer area according to the obtained distribution transformer and ammeter user voltage and current data; and obtaining a maximum or minimum impedance interval corresponding to the maximum or minimum distribution probability according to the distribution probability of loop impedance of all users in the area, and positioning the line with abnormal state in the area. And continuously tracking and calculating loop impedance of all users in the transformer area, and finely judging the specific position of abnormal line parameters of the transformer area according to the affiliation of the outgoing line, the branches and the table boxes of the users to assist in guiding the operation and inspection work of the transformer area.
Description
Technical Field
The invention relates to the technical field of line anomaly positioning, in particular to a line anomaly positioning method based on loop impedance, a storage medium and computing equipment.
Background
The transformer area is positioned at the end link of the power grid and is an important tie for connecting the power grid with users, and the power supply of the transformer area is reliable and stable and directly related to the power consumption experience of the users. The operation and maintenance work of the transformer area is in a passive overhaul and post-overhaul state for a long time due to huge volume and limited operation and maintenance resources of the power grid company, and the operation and maintenance requirements of the transformer area are hardly met by the existing overhaul strategy under the increasingly higher power supply reliability requirements of the power grid company.
Aiming at the state of the line of the transformer area, the evaluation is carried out by means of operation and maintenance experience for a long time, the common mode is to plan maintenance, define transformer areas of types such as urban networks and rural networks, make maintenance duration periods of the transformer areas, and maintain the condition of power supply equipment of the transformer areas according to fixed periods. Under the condition of the shortage of operation and maintenance resources of the existing low-voltage transformer area, the operation and detection work of the transformer area is not strong in guidance, time and labor are consumed, the maintenance work purpose is not clear, the maintenance efficiency is low, and the effect is not obvious.
Disclosure of Invention
In order to overcome the problems, the invention provides a circuit abnormality positioning method, a storage medium and a computing device based on loop impedance, which solve the problem of low maintenance efficiency under the condition of operation and maintenance resources shortage of the existing low-voltage transformer area.
The invention provides a circuit abnormality positioning method based on loop impedance, which comprises the following steps:
collecting current and voltage data of low-voltage transformer area users and distribution transformers, and screening according to set requirements;
calculating the distribution probability of loop impedance of all users in a low-voltage transformer area according to the obtained distribution transformer and ammeter user voltage and current data;
and obtaining a maximum or minimum impedance interval corresponding to the maximum or minimum distribution probability according to the distribution probability of loop impedance of all users in the area, and positioning the line with abnormal state in the area.
Further, the set requirements include:
(1) The voltage of the user is in the range of 220V x [1-10%,1+7% ];
(2) The voltage difference between the front and back time of the distribution transformer and the user is required to be between [ -4V,4V ];
(3) The current requirements of the user satisfy: the difference between the current at the front and rear time points is between-10A, and the current range is within the range of [1A,25A ].
Further, the calculation method of the distribution probability of the loop impedance of the user comprises the following steps: and calculating loop impedance for a plurality of times aiming at a single user to obtain an impedance vector, equally dividing the impedance vector into a plurality of intervals, and calculating the distribution probability in each interval.
Further, the loop impedance calculation formula of a certain user is:
and->The voltages of the C phase of the low-voltage outlet of the distribution transformer at the time t1 and the time t2 are respectively +.>And->At two moments of t1 and t2 respectively, a meter of a user connected to a C phase of a low-voltage outlet of the distribution transformer measures voltage, < + >>And->The current value of the user at time t1 and t 2.
Further, it is characterized in that: after the impedance vector is equally divided into a plurality of intervals, abnormal data exceeding the interval mean value set times in each interval are removed, the intervals are re-divided according to the residual data, and the distribution probability of each interval is calculated.
Further, the line method for locating the abnormal state of the platform area comprises the following steps:
if the maximum impedance interval difference of the impedance distribution probabilities of users in the same phase with the meter box exceeds 5 x delta r=0.025, positioning the abnormal line state or loose connection point of the connection section from the power supply in the meter box to the ammeter;
if the maximum impedance interval difference of the impedance distribution probabilities of users with different phases from the meter box exceeds 10 x delta r=0.05, positioning the abnormal state of a connecting line or loose connecting points between the meter box and the branch box;
traversing the maximum value, the minimum value and the impedance interval of the impedance distribution probability of all users under the same branch box, and if the difference between the maximum impedance interval and the minimum impedance interval exceeds 20 x delta r=0.1, positioning the abnormal state or loose connection point of the connection line between the meter box of the user with the maximum impedance interval and the meter box of the user with the minimum impedance interval; Δr is the impedance interval.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the aforementioned method of location of a region line state anomaly based on loop impedance calculations.
A computing device comprising one or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the aforementioned method of location of a site line state anomaly based on loop impedance calculations.
The invention has the beneficial effects that: by selecting the operation data of the transformer area, calculating the loop impedance of the transformer area users, calculating the probability distribution of the loop impedance of the users in a fixed interval, obtaining the maximum distribution probability and the interval corresponding to the maximum distribution probability, comparing the impedance distribution conditions of the same-meter box, the same-branch box and the same-outlet user, refining and positioning the line state and the potential connection problem to the meter box, the branch and the outlet which are specifically subordinate to the users, helping to guide operation and maintenance staff to purposefully open the maintenance work of the transformer area, and having high maintenance efficiency.
Drawings
FIG. 1 is a schematic diagram of a common low voltage zone topology;
FIG. 2 is a diagram of the relationship of a zone user subordinate to a superior device (allowing one-to-many from top to bottom);
fig. 3 is a schematic diagram of the impedance probability distribution of two users in an implementation of the present invention.
Detailed description of the preferred embodiments
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, a common low voltage zone topology includes: the distribution transformer, the outlet cabinet, the branch boxes, the meter boxes and the user electric meters, the three-phase voltage output by the outlet cabinet is divided into a plurality of paths by the branch boxes, each phase of each path can be connected with a plurality of groups of meter boxes, and each phase in each meter box can be connected with a plurality of user electric meters;
example 1:
a method for locating abnormal state of a line state of a station area based on loop impedance calculation comprises the following steps:
step 1, collecting current and voltage data of a low-voltage transformer area user and a distribution transformer, and screening according to set requirements;
the set requirements include:
(1) The voltage of the user is in the range of 220V x [1-10% 1+7% ];
(2) The voltage difference between the front and back time of the distribution transformer and the user is required to be between [ -4V,4V ];
if the voltage of the C phase of the user 1 and the distribution transformer is required to meet the following conditions:
and->The voltages of the phase C of the low-voltage outlet of the distribution transformer at the time t1 and the time t2 are respectively; />And->The voltage is measured by a meter of the user 1 at two moments of t1 and t2 respectively;
(3) The current requirements of the user satisfy: the difference value of the current between the front and the back moments is between [ -10A,10A ], and the current range is between [1A,25A ];
the current requirement of user 1 is as follows:
and->The current value of the user 1 at the moment t1 and t 2;
step 2, calculating the distribution probability of loop impedance of all users in the low-voltage transformer area according to the obtained distribution transformer and the user voltage and current data;
the calculation method comprises the following steps: and calculating loop impedance for a plurality of times aiming at a single user to obtain an impedance vector, equally dividing the impedance vector into a plurality of intervals, and calculating the distribution probability in each interval.
Taking user 1 of Table box 1 as an example, the KVL equation is written:
the loop impedance is described as the equivalent impedance from the distribution outlet cabinet to the path of the consumer power flow, then the loop impedance of consumer 1 is R eq_u1 Formula (1) can be rewritten as:
thereby having the following characteristics
Wherein t1 and t2 respectively refer to two different moments;and->The voltage of the C phase of the low-voltage outlet (namely the outlet cabinet) of the distribution transformer at the moment t1 and the moment t2 is respectively +.>And->Meter measurement for user 1 at two times, t1 and t2, respectivelyMeasuring the voltage. R is R C1 C-phase resistance from the low-voltage side (i.e. outlet cabinet) of the distribution transformer to the branch box; />And->C phase currents from the low-voltage side (namely the outlet cabinet) of the distribution transformer to the branch box at the time t1 and the time t2 respectively; r is R Cb1 The line resistance from the access point of the meter box 1 to the phase C of the meter box is shown; />And->The current value of user 1 at time t1, t2 +.>And->The line currents from the access point of the time table box 1 to the C phase of the table box are respectively t1 and t 2;
the present embodiment calculates the loop impedance one thousand times for a single user to obtain an impedance vector: r is R eq_u1 ＝[R eq_u1 (1),R eq_u1 (2),…R eq_u1 (1000)]Taking 50 result data as window width (namely, equally dividing impedance vectors into 20 intervals), adopting a sliding window form, removing abnormal calculation results which are 3 times larger than the average value in the window, and calculating the distribution probability of each interval from 0.005 to 0.8 by taking Deltar=0.005 omega as interval of the residual data. As shown in fig. 3, a distribution probability map for users 1 and 2.
Step 3, obtaining a maximum or minimum impedance interval corresponding to the maximum or minimum distribution probability according to the distribution probability of loop impedance of all users in the area, and positioning the line with abnormal state in the area; the positioning method comprises the following steps:
(1) If the maximum impedance interval difference of the impedance distribution probabilities of users in the same phase with the meter box exceeds 5 x delta r=0.025, positioning the abnormal line state or loose connection point of the connection section from the power supply in the meter box to the ammeter;
(2) If the maximum impedance interval difference of the impedance distribution probabilities of users with different phases from the meter box exceeds 10 x delta r=0.05, positioning the abnormal state of a connecting line or loose connecting points between the meter box and the branch box;
(3) Traversing the maximum value, the minimum value and the impedance interval of the impedance distribution probability of all users under the same branch box, and if the difference between the maximum impedance interval and the minimum impedance interval exceeds 20 x delta r=0.1, locating the abnormal state or loose connection point of the connection line between the meter box of the user with the maximum impedance interval and the meter box of the user with the minimum impedance interval.
Example 2:
a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of a method of location of a zone line state anomaly based on loop impedance calculations.
A computing device comprising one or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of a method of location of a site line state anomaly based on loop impedance calculations.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (7)
1. The circuit abnormality positioning method based on the loop impedance is characterized by comprising the following steps:
collecting current and voltage data of low-voltage transformer area users and distribution transformers, and screening according to set requirements;
calculating the distribution probability of loop impedance of all users in a low-voltage transformer area according to the obtained distribution transformer and ammeter user voltage and current data;
obtaining a maximum or minimum impedance interval corresponding to the maximum or minimum distribution probability according to the distribution probability of loop impedance of all users in the area, and positioning the line with abnormal state in the area; the line method for locating the abnormal state of the platform area comprises the following steps:
if the maximum impedance interval difference of the impedance distribution probabilities of users in the same phase with the meter box exceeds 5 x delta r=0.025, positioning the abnormal line state or loose connection point of the connection section from the power supply in the meter box to the ammeter;
if the maximum impedance interval difference of the impedance distribution probabilities of users with different phases from the meter box exceeds 10 x delta r=0.05, positioning the abnormal state of a connecting line or loose connecting points between the meter box and the branch box;
traversing the maximum value, the minimum value and the impedance interval of the impedance distribution probability of all users under the same branch box, and if the difference between the maximum impedance interval and the minimum impedance interval exceeds 20 x delta r=0.1, positioning the abnormal state or loose connection point of the connection line between the meter box of the user with the maximum impedance interval and the meter box of the user with the minimum impedance interval; Δr is the impedance interval.
2. The circuit abnormality locating method based on the loop impedance according to claim 1, characterized in that: the set requirements include:
(1) The voltage of the user is in the range of 220V x [1-10%,1+7% ];
(2) The voltage difference between the front and back time of the distribution transformer and the user is required to be between [ -4V,4V ];
(3) The current requirements of the user satisfy: the difference between the current at the front and rear time points is between-10A, and the current range is within the range of [1A,25A ].
3. The circuit abnormality locating method based on the loop impedance according to claim 1, characterized in that: the calculation method of the distribution probability of the loop impedance of the user comprises the following steps: and calculating loop impedance for a plurality of times aiming at a single user to obtain an impedance vector, equally dividing the impedance vector into a plurality of intervals, and calculating the distribution probability in each interval.
4. A method for locating a circuit anomaly based on loop impedance as claimed in claim 3, wherein: the loop impedance calculation formula of a certain user is as follows:
and->The voltages of the C phase of the low-voltage outlet of the distribution transformer at the time t1 and the time t2 are respectively +.>And->At two moments of t1 and t2 respectively, a meter of a user connected to a C phase of a low-voltage outlet of the distribution transformer measures voltage, < + >>And->The current value of the user at time t1 and t 2.
5. A method for locating a circuit anomaly based on loop impedance as claimed in claim 3, wherein: after the impedance vector is equally divided into a plurality of intervals, abnormal data exceeding the interval mean value set times in each interval are removed, the intervals are re-divided according to the residual data, and the distribution probability of each interval is calculated.
6. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the method of location of a cell line state anomaly based on loop impedance calculations of claims 1-5.
7. A computing device, characterized by: comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the method for locating a site line state anomaly based on loop impedance calculations in claims 1-5.
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