CN111999677B - Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter - Google Patents

Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter Download PDF

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Publication number
CN111999677B
CN111999677B CN202011167202.7A CN202011167202A CN111999677B CN 111999677 B CN111999677 B CN 111999677B CN 202011167202 A CN202011167202 A CN 202011167202A CN 111999677 B CN111999677 B CN 111999677B
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short circuit
judging
meter box
monitoring terminal
meter
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CN111999677A (en
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何朝伟
邓士伟
王永生
李振杰
马霞
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Jiangsu Zhizhen Energy Technology Co ltd
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Jiangsu Zhizhen Energy Technology Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52Testing for short-circuits, leakage current or ground faults
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks

Abstract

The invention relates to an indoor and outdoor short circuit identification method based on a meter box monitoring terminal and an intelligent ammeter, which comprises the following steps: watch boxCollecting the current of a main incoming line; calculating a mutation value between adjacent sampled current points; judging whether the adjacent current abrupt change values belong to a specific interval or notIf yes, judging that a short-circuit event occurs, and entering step; if not, judging that no short-circuit event occurs, and entering step four; step four, current data of all the electric meters are collected and then the electric meters return to the step. Collecting current data of each ammeter, and calculating a change value of the current data and the previous current data; sixthly, judging whether the current change value belongs to a specific interval b1And whether the present current belongs to a specific interval b2(ii) a If yes, judging that the user of the ammeter has a short circuit; if not, judging that the electricity meter user does not have short circuit. And if all the users of the electric meters cannot judge that the short circuit occurs, judging that a certain user in the meter box has the short circuit. The invention can analyze whether the indoor and outdoor short circuit occurs or not, and improve the first-aid repair speed and efficiency.

Description

Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter
Technical Field
The invention relates to an indoor and outdoor short circuit identification method based on a meter box monitoring terminal and an intelligent electric meter, and belongs to the technical field of intelligent power grids and intelligent electricity utilization.
Background
The occurrence of a short circuit event by a residential customer is a major cause of tripping of the air switch. The power failure fault research and judgment of the power company is facilitated by analyzing the indoor and outdoor short-circuit events, and the fault operation and maintenance capacity of the low-voltage distribution network is improved. The current generated after short circuit can reach more than 200A, however, the traditional smart electric meter has small current collection rated value and weak data analysis capability, and cannot realize collection and analysis of large current. The power supply company is difficult to study and judge the responsibilities of indoor and outdoor short circuit and power failure accidents, and the first-aid repair speed and efficiency are influenced.
Therefore, the invention provides an indoor and outdoor short circuit identification method based on a meter box monitoring terminal and an intelligent ammeter.
Disclosure of Invention
In order to solve the technical problems, the invention provides an indoor and outdoor short circuit identification method based on a meter box monitoring terminal and a smart meter, which has the following specific technical scheme: the table case monitor terminal passes through air switch and connects in table case general inlet wire department, and table case monitor terminal's current signal gathers mouthful and voltage signal gathers mouthful and link to each other with table case general inlet wire respectively, and table case monitor terminal's collection communication interface links to each other with the communication interface of each smart electric meter that table case general inlet wire hung down respectively, and indoor outer short circuit discernment includes following step:
step 1: the meter box monitoring terminal collects the current of the meter box main incoming line to obtain a current sequence I1……InWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific intervalIf yes, judging that a short-circuit event occurs, and entering a step 5; if not, judging that no short-circuit event occurs, and entering the step 4;
and 4, step 4: carrying out current data acquisition on each intelligent ammeter to obtain a current sequence of each ammeterThen returning to the step 1;
and 5: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculating the variation value between the current data and the last collected current data,
Step 6: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2(ii) a If yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
Further, the specific interval described in step 3
Further, the specific interval described in step 6
Further, when it is determined in step 3 that the short-circuit event does not occur, the time length from the last reading of the current of the electric meter is continuously determined, if the time length is less than 1 minute, the step 1 is directly returned, and if the time length is greater than or equal to 1 minute, the step 4 is returned.
Furthermore, if the meter box monitoring terminal is matched with a self-contained power supply and has the function of sending data in power failure, in the step 1, the voltage of the main incoming line of the meter box is collected to obtain a voltage sequence U1……Un(ii) a And when the short-circuit event is judged to occur in the step 3, scanning the voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an intervalIf, ifIf yes, judging that an outdoor short circuit trip event exists and reporting; if not, judging that an indoor short circuit tripping event occurs, and entering the step 5.
Further, the
Further, in step 4, current data acquisition is performed on each intelligent electric meter every minute.
Further, step 7: and if all the users of the intelligent electric meters in the meter box cannot judge that the short circuit trip occurs, reporting the event that a certain user in the meter box has the short circuit trip.
Furthermore, the acquisition communication interface of the meter box monitoring terminal is an RS-485 communication interface, and the meter box monitoring terminal uploads the short-circuit event through an HPLC (high performance liquid chromatography) and a 2G-5G wireless network.
The invention discloses an indoor and outdoor short circuit identification method based on a meter box monitoring terminal and an intelligent ammeter, and the other technical scheme is as follows: the meter box monitoring terminal is connected to a meter box main inlet wire through an air switch, a current signal acquisition port and a voltage signal acquisition port of the meter box monitoring terminal are respectively connected with the meter box main inlet wire, and an acquisition communication interface of the meter box monitoring terminal is respectively connected with a communication interface of each intelligent electric meter hung below the meter box main inlet wire; the meter box monitoring terminal has the function of sending data in power failure, each intelligent electric meter has the function of freezing current minutes, and indoor and outdoor short circuit identification comprises the following steps:
step 1: the meter box monitoring terminal collects the current and the voltage of the total inlet wire of the meter box to obtain a current sequence I1……InSequence of voltages U1……UnWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific interval(ii) a If yes, judging that a short-circuit event occurs, scanning a voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an interval(ii) a If yes, judging that an outdoor short circuit trip event exists and reporting; if not, judging that an indoor short circuit trip event occurs, and entering the step 4;
if not in the specific intervalIf yes, judging that no short-circuit event occurs, and returning to the step 1;
and 4, step 4: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculates a change value from the current data of the previous minute,
and 5: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2B, carrying out the following steps of; if yes, judging that the ammeter user has short circuit trip and reporting(ii) a If not, judging that the ammeter user does not have short circuit trip.
The invention has the beneficial effects that:
1. because the current collection and the computing power of the intelligent ammeter are insufficient, indoor and outdoor short circuit identification is realized, the conventional idea is to replace the intelligent ammeter with a high-performance collection and computation ammeter, and meanwhile, the collection equipment is installed at a meter box. The intelligent ammeter box monitoring terminal is additionally arranged under the condition that the intelligent ammeter is not replaced, so that the indoor and outdoor short-circuit event judgment can be realized, the equipment installation is less, the cost is low, and the implementation is easy;
2. the intelligent ammeter has a real-time interaction function, can realize real-time judgment and real-time early warning of short-circuit events in residents' homes and ammeter boxes, and is high in accuracy;
3. the system is beneficial to power supply companies to research and judge the responsibility of indoor and outdoor short circuit and power failure accidents, improves the first-aid repair speed and efficiency, and improves the operation and maintenance capacity of power grid faults;
4. the meter box monitoring terminal is independently connected with the air switch to play a role in protection during operation, and is communicated with the intelligent electric meters through RS-485, so that current data of each intelligent electric meter can be collected every minute;
5. when the short circuit event occurs to resident users to cause the idle trip, the method firstly judges whether the short circuit trip event exists in the meter box, and further judges which electricity meter user has the short circuit trip event when the short circuit trip event occurs in the meter box, so that the fault point judgment is accurate and quick;
6. when table case monitoring terminal was equipped with the power of oneself, possessed to have a power failure and when sending data function, can discern outdoor short circuit tripping operation incident earlier, further discernment is carried out to indoor short circuit tripping operation incident again.
7. When the intelligent ammeter has the current minute freezing function, minute-level current collection is not required to be carried out on each ammeter every minute by the meter box monitoring terminal, and after a short-circuit event is detected, current collection is carried out on each ammeter, and the last minute current is read, so that short-circuit tripping can be identified, and the flow is simplified.
Drawings
FIG. 1 is a schematic diagram of an indoor and outdoor short circuit identification system based on a meter box monitoring terminal and a smart meter used in the invention;
FIG. 2 is a flow chart of the indoor and outdoor short circuit identification method based on a meter box monitoring terminal and a smart meter;
FIG. 3 is a flow chart of an indoor and outdoor short circuit identification method based on a meter box monitoring terminal with a self-contained power supply and a smart meter;
fig. 4 is a flowchart based on a meter box monitoring terminal with a self-contained power supply and an indoor and outdoor short circuit identification method of an intelligent electric meter with a current minute freezing function.
In the figure: 1-meter box, 2-meter box monitoring terminal, DZ 1-meter box total open, and DZ 2-monitoring terminal open.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, a meter box total empty opening DZ1 is installed at a total incoming line in the meter box 1, and an intelligent electric meter of each user is hung under the meter box total empty opening DZ 1. A monitoring terminal empty opening DZ2 is arranged below the meter box main empty opening DZ1, a meter box monitoring terminal 2 is arranged below the monitoring terminal empty opening DZ2, a current signal acquisition port and a voltage signal acquisition port of the meter box monitoring terminal 2 are respectively connected with a meter box main incoming line, and an RS-485 communication interface of the meter box monitoring terminal is respectively connected with communication interfaces of intelligent electric meters hung below the meter box main incoming line; and the meter box monitoring terminal 2 uploads the short-circuit event through an HPLC (high performance liquid chromatography) and 2G-5G wireless network.
As shown in fig. 2, the indoor and outdoor short-circuit identification method based on the meter box monitoring terminal and the smart meter of the present invention includes the following steps:
step 1: the meter box monitoring terminal collects the current of the meter box main incoming line to obtain a current sequence I1……InWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific interval(ii) a If yes, judging that a short-circuit event occurs, and entering a step 5;
if not in the specific intervalIf the short-circuit event does not occur, continuously judging the time length from the last reading of the current of the ammeter, if the time length is less than 1 minute, directly returning to the step 1, and if the time length is more than or equal to 1 minute, entering the step 4;
and 4, step 4: the current data acquisition is carried out on each intelligent ammeter, and the current data can be acquired once per minute to obtain the current sequence of each ammeterThen returning to the step 1;
and 5: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculating the variation value between the current data collected last time,
step 6: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2B, carrying out the following steps of; if yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
Under most conditions, through the steps, which user of the ammeter generates the short circuit trip can be accurately judged, and if all users of the intelligent ammeters in the ammeter box cannot judge the short circuit trip through the step 6, fuzzy judgment is performed through a step 7:
and 7: and if all the users of the intelligent electric meters in the meter box cannot judge that the short circuit trip occurs, reporting the event that a certain user in the meter box has the short circuit trip.
As shown in fig. 3, if a super capacitor or other self-contained power supply is added to the meter box monitoring terminal 2, data can be uploaded after power failure, the short circuit trip function inside and outside the house can be identified, and the identification process comprises the following steps:
step 1: the meter box monitoring terminal collects the current and the voltage of the total inlet wire of the meter box to obtain a current sequence I1……InSequence of voltages U1……UnWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific interval(ii) a If yes, judging that a short-circuit event occurs, scanning a voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an intervalB, carrying out the following steps of; if yes, judging that an outdoor short circuit trip event exists and reporting; if not, judging that an indoor short circuit trip event occurs, and entering the step 5;
if not in the specific intervalIf the short-circuit event does not occur, continuously judging the time length from the last reading of the current of the ammeter, if the time length is less than 1 minute, directly returning to the step 1, and if the time length is more than or equal to 1 minute, entering the step 4;
and 4, step 4: the current data acquisition is carried out on each intelligent ammeter, and the current data can be acquired once per minute to obtain the current sequence of each ammeterThen returning to the step 1;
and 5: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculating the variation value between the current data collected last time,
step 6: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2B, carrying out the following steps of; if yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
Under most conditions, through the steps, which user of the ammeter generates the short circuit trip can be accurately judged, and if all users of the intelligent ammeters in the ammeter box cannot judge the short circuit trip through the step 6, fuzzy judgment is performed through a step 7:
and 7: and if all the users of the intelligent electric meters in the meter box cannot judge that the short circuit trip occurs, reporting the event that a certain user in the meter box has the short circuit trip.
As shown in fig. 4, if a super capacitor or other self-contained power supply is added to the meter box monitoring terminal 2, the function of sending data in power failure is provided, and the function of short-circuit tripping inside and outside the house can be identified. If smart electric meter possesses the electric current minute and freezes the function, then table case monitoring terminal 2 does not need to carry out minute level current collection to each ammeter every minute, and the discernment flow includes following step:
step 1: the meter box monitoring terminal collects the current and the voltage of the total inlet wire of the meter box to obtain a current sequence I1……InSequence of voltages U1……UnWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific interval(ii) a If yes, judging that a short-circuit event occurs, scanning a voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an intervalB, carrying out the following steps of; if yes, judging that an outdoor short circuit trip event exists and reporting; if not, judging that an indoor short circuit trip event occurs, and entering the step 4;
if not in the specific intervalIf yes, judging that no short-circuit event occurs, and returning to the step 1;
and 4, step 4: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculates a change value from the current data of the previous minute,
and 5: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2B, carrying out the following steps of; if yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
Under most conditions, through the steps, which user of the ammeter generates the short circuit trip can be accurately judged, if all users of the intelligent ammeter in the ammeter box cannot judge the short circuit trip through the step 5, fuzzy judgment is carried out through the step 6:
step 6: and if all the users of the intelligent electric meters in the meter box cannot judge that the short circuit trip occurs, reporting the event that a certain user in the meter box has the short circuit trip.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. The utility model provides an indoor outer short circuit identification method based on table case monitoring terminal and smart electric meter, table case monitoring terminal passes through air switch and connects in table case general inlet wire department, and table case monitoring terminal's current signal gathers mouthful and voltage signal gathers mouthful and links to each other with table case general inlet wire respectively, and table case monitoring terminal's collection communication interface links to each other with the communication interface of each smart electric meter that table case general inlet wire hung down respectively, and its characterized in that, indoor outer short circuit identification includes following step:
step 1: the meter box monitoring terminal collects the current of the meter box main incoming line to obtain a current sequence I1……InWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific intervalIf yes, judging that a short-circuit event occurs, and entering a step 5; if not, judging that no short-circuit event occurs, and entering the step 4;
and 4, step 4: carrying out current data acquisition on each intelligent ammeter to obtain a current sequence of each ammeter at the same momentThen returning to the step 1;
and 5: acquiring current data of each intelligent ammeter to obtain a current sequenceAnd calculating the variation value between the current data and the last collected current data
Step 6: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2(ii) a If yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
2. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that: the specific interval described in step 3
3. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that: the specific interval described in step 6
4. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that: and when the short-circuit event is judged not to occur in the step 3, continuously judging the time length from the last reading of the current of the ammeter, directly returning to the step 1 if the time length is less than 1 minute, and entering the step 4 if the time length is more than or equal to 1 minute.
5. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that: if the meter box monitoring terminal is matched with a self-prepared power supply and has the function of sending data in power failure, then in step 1, the voltage of the total incoming line of the meter box is collected to obtain a voltage sequence U1……Un(ii) a And when the short-circuit event is judged to occur in the step 3, scanning the voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an intervalIf yes, judging that an outdoor short circuit trip event exists and reporting; if not, judging that an indoor short circuit tripping event occurs, and entering the step 5.
6. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 5, characterized in that: the above-mentioned
7. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that: and 4, acquiring current data of each intelligent electric meter every minute.
8. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to claim 1, characterized in that the step 7: and if all the users of the intelligent electric meters in the meter box cannot judge that the short circuit trip occurs, reporting the event that a certain user in the meter box has the short circuit trip.
9. The indoor and outdoor short circuit identification method based on the meter box monitoring terminal and the smart meter according to any one of claims 1 to 8, characterized in that: the acquisition communication interface of the meter box monitoring terminal is an RS-485 communication interface, and the meter box monitoring terminal uploads the short-circuit event through an HPLC (high performance liquid chromatography) and a 2G-5G wireless network.
10. An indoor and outdoor short circuit identification method based on a meter box monitoring terminal and intelligent electric meters is characterized in that the meter box monitoring terminal is connected to a meter box main incoming line through an air switch, a current signal acquisition port and a voltage signal acquisition port of the meter box monitoring terminal are respectively connected with the meter box main incoming line, and acquisition communication interfaces of the meter box monitoring terminal are respectively connected with communication interfaces of the intelligent electric meters hung below the meter box main incoming line; the meter box monitoring terminal has the function of sending data on power failure, and each intelligent electric meter has the function of freezing current minutes, and is characterized in that indoor and outdoor short circuit identification comprises the following steps:
step 1: the meter box monitoring terminal collects the current and the voltage of the total inlet wire of the meter box to obtain a current sequence I1……InSequence of voltages U1……UnWherein n is a sampling value serial number;
step 2: calculating the abrupt change value between adjacent sampling current points
And step 3: judging whether the mutation value delta I between adjacent sampling current points belongs to a specific interval(ii) a If yes, judging that a short-circuit event occurs, scanning a voltage acquisition signal UnCalculating the effective value of voltage UrmsThen judging the effective value of the voltage UrmsWhether or not it belongs to an interval(ii) a If yes, judging that an outdoor short circuit existsA trip event is reported; if not, judging that an indoor short circuit trip event occurs, and entering the step 4;
if not in the specific intervalIf yes, judging that no short-circuit event occurs, and returning to the step 1;
and 4, step 4: acquiring current data of each intelligent electric meter to obtain current sequence of each intelligent electric meterAnd calculates a change value from the current data of the previous minute,
and 5: judgment ofWhether or not to belong to a specific section b1And is andwhether or not to belong to a specific section b2(ii) a If yes, judging that the ammeter user has short circuit trip and reporting; if not, judging that the ammeter user does not have short circuit trip.
CN202011167202.7A 2020-10-28 2020-10-28 Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter Active CN111999677B (en)

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