CN111509710A

CN111509710A - TN-C platform area electric leakage identification method, system, equipment and storage medium

Info

Publication number: CN111509710A
Application number: CN202010358894.7A
Authority: CN
Inventors: 张明明
Original assignee: Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
Current assignee: Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-07
Anticipated expiration: 2040-04-29
Also published as: CN111509710B

Abstract

The invention discloses a TN-C platform area electric leakage identification method, a TN-C platform area electric leakage identification system, TN-C platform area electric leakage identification equipment and a storage medium. The TN-C platform area electric leakage identification method comprises the following steps: acquiring electric energy data of a grounding conductor and a protective neutral line in a low-voltage transformer area; calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral wire; and identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor. According to the technical scheme, the technical problems that a leakage identification method suitable for a TN-C system is lacked and synchronization cannot be guaranteed in current phase data acquisition of a grounding conductor in the prior art are solved, real-time monitoring of TN-C distribution lines is achieved, accuracy of leakage identification of a distribution area is improved, leakage conditions of the distribution area can be determined in time, casualties caused by leakage accidents are avoided, and effective technical support is provided for safe operation of the distribution area.

Description

TN-C platform area electric leakage identification method, system, equipment and storage medium

Technical Field

The embodiment of the invention relates to the technical field of low-voltage distribution networks, in particular to a TN-C station area electric leakage identification method, a TN-C station area electric leakage identification system, TN-C station area electric leakage identification equipment and a storage medium.

Background

In practical application, the low-voltage distribution network is often responsible for the task of supplying power to users at the last stage, and the distribution of the users is often relatively dispersed, which results in wide distribution line coverage and complex connection in a distribution area. In the long-term operation process, low-voltage lines and electrical equipment are exposed to complex environments, frequent operation and maintenance are lacked, and the insulation of the lines and the electrical equipment is easy to age and lose efficacy; in addition, in humid and rainy weather, the lines and electrical equipment can be rewet or be wetted by rainwater and even be flooded. Therefore, the phenomena of electrical fire and electric shock accidents of personnel caused by the damage of the distribution network line or the electric leakage of electrical equipment often occur.

At present, TN-C system is generally adopted in low-voltage area. The TN-C system adopts a three-phase four-wire system, combines the grounding protection wire PE and the neutral wire N into one wire, and repeatedly grounds. The TN-C system is difficult to identify when an electric leakage accident occurs, and mainly faces the following problems: the existing electric leakage identification method is a residual current method and mainly aims at a TN-S grounding system, but for the TN-C system, a neutral line and a protection line are combined into a whole, so that the residual current method cannot distinguish electric leakage and three-phase unbalanced current, and the identification result is inaccurate; the TN-C system has repeated ground connection, and the current collection of ground conductor needs to be accomplished through the collection system who installs in different places, is subject to the communication condition of low voltage electric wire netting, and the synchronism of data acquisition is difficult to guarantee to lead to the electric leakage identification result to have the error.

Disclosure of Invention

The embodiment of the invention provides a TN-C distribution area electric leakage identification method, a TN-C distribution area electric leakage identification system, TN-C distribution area electric leakage identification equipment and a storage medium, so that real-time monitoring of TN-C distribution area distribution lines is realized, accuracy of distribution area electric leakage identification is improved, and technical support is provided for safe operation of a distribution area.

In a first aspect, an embodiment of the present invention provides a TN-C station area leakage identification method, including:

acquiring power data of a ground conductor and a protection neutral line in a low-voltage transformer area, wherein the power data of the ground conductor comprises a current and a voltage to ground of the ground conductor and a phase angle difference between the current and the voltage to ground of the ground conductor, the power data of the protection neutral line comprises a current between connection points on the protection neutral line and a phase angle difference between the current and the voltage to ground of the ground conductor, and the connection points on the protection neutral line are connection points of the ground conductor and the protection neutral line;

calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral wire;

and identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor.

Optionally, acquiring power data of the ground conductor and the protective neutral in the low-voltage transformer area includes:

acquiring line structure information of a low-voltage transformer area;

determining the number of the grounding conductors, the number of sections of the protection neutral line divided by the connecting points and the connection information between the grounding conductors and the protection neutral line in a low-voltage transformer area;

and reading the electric energy data of the grounding conductor and the protective neutral line collected at each connecting point.

Optionally, the determining the number of the ground conductors, the number of segments of the protection neutral line divided by the connection point, and the connection information between the ground conductors and the protection neutral line in the low-voltage transformer area includes:

numbering the grounding conductor, the connection point of the grounding conductor and the protective neutral line and each section of the protective neutral line on the basis of the distance between a low-voltage transformer area line and a transformer neutral point;

and determining the connection sequence of the grounding conductor, the connection point of the grounding conductor and the protective neutral line and each section of the protective neutral line according to the number.

Optionally, for the first ground conductor in the low-voltage transformer area, determining the current phase of the ground conductor according to the phase of the voltage to ground of the ground conductor and the phase angle difference between the current and the voltage to ground of the ground conductor;

and for two adjacent grounding conductors in the low-voltage transformer area, calculating the current phase of the next grounding conductor according to the numerical relationship among the electric energy data of the last grounding conductor, the electric energy data of the next grounding conductor and the electric energy data of the protective neutral line between the last grounding conductor and the next grounding conductor.

Optionally, the current phase of the first ground conductor is calculated using the following formula:

wherein i is the number of the ground conductor, and i is 1,

a phase of a voltage to ground of the first one of the ground conductors, m is a set reference value,

the current phase of the first of said ground conductors,

the phase angle difference between the current of the first grounding conductor and the voltage to ground;

calculating the current phase of the ground conductors other than the first ground conductor using the following formula:

wherein i is more than 1 and less than or equal to n, n is the total number of the grounding conductors, f is the number of the last grounding conductor connected with the ith grounding conductor, and U_fIs the voltage to ground of the f-th said ground conductor,

phase of voltage to ground for the f-th said ground conductor, R_fiIs the resistance of the protective neutral line between the ith and the fth ground conductors, I_fiFor the current of the protective neutral between the ith and the fth ground conductors,

is I_fiAnd U_fPhase angle difference of (U)_iIs the voltage to ground of the ith said ground conductor,

for the phase of the voltage to ground of the ith said ground conductor,

the current phase of the ith said ground conductor,

current and U for the ith said grounding conductor_iPhase angle difference of (2).

Optionally, identifying whether the low-voltage transformer area leaks electricity based on a magnitude relation between a set leakage threshold and a sum of current phasors of the ground conductor includes:

judging the magnitude relation between the set leakage threshold and the current phasor sum mode of the grounding conductor;

and if the current phasor sum mode of the grounding conductor is greater than or equal to the set leakage threshold value, the low-voltage transformer area has the leakage condition.

Optionally, the current phasor sum of the ground conductors is calculated as:

wherein I is more than or equal to 1 and less than or equal to n, n is the total number of the grounding conductors, I_i0Is the current of the ith said ground conductor,

is the current phase of the ith said ground conductor.

In a second aspect, an embodiment of the present invention further provides a TN-C station area leakage identification system, including:

the power data acquisition module is used for acquiring power data of a ground conductor and a protection neutral line in a low-voltage transformer area, wherein the power data of the ground conductor comprises a current and a voltage to ground of the ground conductor and a phase angle difference between the current and the voltage to ground of the ground conductor, the power data of the protection neutral line comprises a current between connection points on the protection neutral line and a phase angle difference between the current and the voltage to ground of the ground conductor, and the connection points on the protection neutral line are connection points of the ground conductor and the protection neutral line;

the current phase calculation module is used for calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line;

and the electric leakage identification module is used for identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set electric leakage threshold value and the current phasor sum of the grounding conductor.

In a third aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:

one or more processors;

storage means for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors implement the TN-C station area leakage identification method according to the first aspect.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the TN-C station area leakage identification method according to the first aspect.

The embodiment of the invention provides a TN-C platform area electric leakage identification method, a TN-C platform area electric leakage identification system, TN-C platform area electric leakage identification equipment and a storage medium, wherein the TN-C platform area electric leakage identification method comprises the following steps: acquiring electric energy data of a grounding conductor and a protective neutral line in a low-voltage transformer area; calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral wire; and identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor. According to the technical scheme, the technical problems that a leakage identification method suitable for a TN-C system is lacked and synchronization cannot be guaranteed in current phase data acquisition of a grounding conductor in the prior art are solved, real-time monitoring of TN-C distribution lines is achieved, accuracy of leakage identification of a distribution area is improved, leakage conditions of the distribution area can be determined in time, casualties caused by leakage accidents are avoided, and effective technical support is provided for safe operation of the distribution area.

Drawings

Fig. 1 is a schematic flow chart of a TN-C station area leakage identification method provided in an embodiment of the present invention;

fig. 2 is a schematic flow chart of another TN-C station area leakage identification method provided in the embodiment of the present invention;

fig. 3 is a schematic circuit structure diagram of a TN-C station area provided in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a specific circuit structure of the TN-C station area shown in FIG. 3;

fig. 5 is a schematic flowchart of another TN-C station area leakage identification method according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of another TN-C station area leakage identification method according to an embodiment of the present invention;

fig. 7 is a schematic flowchart of another TN-C station area leakage identification method according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a TN-C station area leakage identification system according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a schematic flow chart of a TN-C block area leakage identification method according to an embodiment of the present invention, where the present embodiment is applicable to identifying whether a leakage accident occurs in a TN-C block area, the method may be executed by a TN-C block area leakage identification system, the system may be implemented in a software and/or hardware manner, the system may be configured in an electronic device, such as a server or a terminal device, and a typical terminal device includes a mobile terminal, specifically includes a mobile phone, a computer, or a tablet computer. As shown in fig. 1, the method may specifically include:

and S110, acquiring electric energy data of the grounding conductor and the protective neutral line in the low-voltage transformer area.

The electric energy data of the ground conductor comprises the current and the phase angle difference between the ground conductor and the phase angle difference between the current and the phase angle difference between the ground conductor and the phase angle.

The TN-C in the embodiment of the invention refers to a basic three-phase four-wire system power supply system used for power supply of building engineering, the TN-C system combines a grounding protection wire PE and a neutral wire N into one wire, namely a neutral wire PEN is protected, and each load accessed into the TN-C system is repeatedly grounded nearby. The TN-C station area can be a power supply range or area of one transformer in the TN-C system, and the low-voltage station area is a power supply range or area of one transformer in a low-voltage distribution network based on the TN-C system. Specifically, the low-voltage transformer area includes a transformer and a plurality of loads, each of the loads is connected to a three-phase power line and a protective neutral line PEN of the transformer, each of the loads is grounded through a grounding conductor at a connection point between the load and the protective neutral line PEN, and the connection point between the transformer and the protective neutral line PEN is also grounded through the grounding conductor, wherein the grounding conductor may be a cable having a certain resistance value. In the power data of the grounding conductor of the low-voltage transformer area, the current of the grounding conductor can be the current value when the grounding conductor is electrified; the voltage to ground of the ground conductor may be a voltage value between a connection point of the ground conductor and the protective neutral line PEN and the ground point; the current of the ground conductor and the voltage to ground of the ground conductor have a phase angle difference therebetween. In the electric energy data of the protective neutral line, each connection point on the protective neutral line can be a connection point of a grounding conductor of a transformer and a load and a protective neutral line PEN; the current between each connection point on the protection neutral line can be the current value on each section of the protection neutral line PEN divided by adjacent connection points on the protection neutral line PEN; the current between the connection points on the protective neutral line has a phase angle difference with the voltage to ground of the ground conductor. In the low-voltage transformer area, electric energy acquisition devices, such as electric meters and other equipment, are arranged nearby corresponding to the transformer and each load, and electric energy data of the grounding conductor and the protective neutral line can be acquired in real time through the electric energy acquisition devices arranged in various places.

And S120, calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line.

For example, two adjacent ground conductors in the low-voltage transformer area and the protection neutral line PEN connecting the two adjacent ground conductors may form a current branch, a connection point between the protection neutral line PEN and the two ground conductors in the current branch forms a current node, the current branch may be analyzed according to kirchhoff's current law, and the current phase of each ground conductor may be calculated by combining the obtained electric energy data of the ground conductors and the protection neutral line. In the prior art, current phase data of a grounding conductor is generally directly acquired by an acquisition device in a TN-C system, however, distribution areas of the grounding conductor are different, the current phase data of the grounding conductor needs to be acquired by the acquisition device installed in different places, the communication condition of a low-voltage power grid is poor, the current phase data of the grounding conductor at different moments in the TN-C system are also different, and the synchronism of the current phase data of the grounding conductor acquired by the acquisition devices in a plurality of different areas is difficult to guarantee, so that the current phase data of each grounding conductor is data at different moments, and when the current phase data is applied to electric leakage judgment, an electric leakage identification result has errors. According to the technical scheme, the current phase of the grounding conductor is calculated according to the electric energy data of the grounding conductor and the protective neutral line, the electric energy data of the grounding conductor and the protective neutral line are the electric energy data of the adjacent grounding conductor and the protective neutral line PEN connected with the adjacent grounding conductor, all the data are placed in the same reference system to be processed, accurate current phase data of the grounding conductor can be calculated directly according to the data acquired in situ by the local acquisition device, whether synchronous acquisition is required to be considered for the electric energy data corresponding to the grounding conductors in different areas, the technical problem that data acquisition in the prior art is not synchronous is solved, and the accuracy of an electric leakage identification result is improved.

And S130, identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor.

Specifically, the phasor sums of the currents of all the ground conductors in the low-voltage transformer area may be calculated, and the numerical relationship between the set leakage threshold of the low-voltage transformer area and the current phasor sums of the ground conductors may be compared. For example, when the sum of the current phasors of the grounding conductors is greater than or equal to a set leakage threshold, it can be determined that a current leakage condition occurs in the low-voltage transformer area; when the sum of the current phasors of the grounding conductors is smaller than a set leakage threshold value, the current normal operation of the low-voltage transformer area can be judged. The specific value for setting the leakage threshold may be set according to specific voltage class data of the low-voltage transformer area, a transformer power parameter, a load power parameter, and the like.

According to the technical scheme of the embodiment, the electric energy data of the grounding conductor and the protective neutral line in the low-voltage transformer area are automatically acquired through the TN-C transformer area electric leakage identification system, the current phase of the grounding conductor is calculated according to the electric energy data of the grounding conductor and the protective neutral line, whether the low-voltage transformer area leaks electricity or not is identified based on the relationship between the set electric leakage threshold of the low-voltage transformer area and the magnitude of the current phasor sum of each grounding conductor in the low-voltage transformer area, the current phase data of each grounding conductor in the low-voltage transformer area can be calculated, and therefore electric leakage identification of the low-voltage transformer area is. According to the technical scheme, the technical problems that a leakage identification method suitable for a TN-C system is lacked and synchronization cannot be guaranteed in current phase data acquisition of a grounding conductor in the prior art are solved, real-time monitoring of TN-C distribution lines is achieved, accuracy of leakage identification of a distribution area is improved, leakage conditions of the distribution area can be determined in time, casualties caused by leakage accidents are avoided, and effective technical support is provided for safe operation of the distribution area.

Example two

Fig. 2 is a schematic flow chart of another TN-C station area leakage identification method provided by the embodiment of the invention. On the basis of the above embodiments, the present embodiment further optimizes the above leakage identification method. As shown in fig. 2, the method specifically includes:

and S210, obtaining the line structure information of the low-voltage transformer area.

Fig. 3 is a schematic circuit structure diagram of a TN-C station area provided in an embodiment of the present invention; fig. 4 is a schematic diagram of a specific circuit structure of the TN-C station area shown in fig. 3. The electric leakage detection method in the present embodiment will be described with reference to fig. 3 and 4. Specifically, the line structure information of the low-voltage transformer area includes the number of transformers and loads in the transformer area, the connection relationship between the transformers and the loads, and the connection relationship between different loads, and may be determined by acquiring an electrical principle wiring diagram of the low-voltage transformer area. Illustratively, fig. 3 and 4 show a low-voltage area in a TN-C area based on a three-phase four-wire system, the low-voltage area includes a transformer 10, a load 20-a load 60 and a switch 70, the transformer 10 is connected with the switch 70, the load 20, the load 30 and the load 50 through a distribution line, the load 40 and the load 60 can be connected to the distribution line where the load 20, the load 30 and the load 50 are located through a distribution box, the transformer 10 supplies power to the load 20-the load 60, and the connection of the transformer 10 with each load can be controlled through the switch 70.

S220, determining the number of the grounding conductors in the low-voltage transformer area, the number of sections of the protective neutral line divided by the connecting points and the connecting information between the grounding conductors and the protective neutral line.

As shown in fig. 3 and 4, in this low-voltage station area, the transformer 10 is connected to the loads 20-60 through three-phase transmission lines M1-M3 and a protective neutral line PEN. The ground conductors in the low-voltage station area include 6 ground conductors M1-M6, and the protective neutral line PEN is divided into 5 sections by 6 connection points of the ground conductors M1-M6 and the protective neutral line PEN, which are respectively a protective neutral line P12, a protective neutral line P23, a protective neutral line P35, a protective neutral line P24, and a protective neutral line P46. Transformer 10 is grounded to protective neutral PEN via ground conductor M1, load 20 is grounded to protective neutral PEN via ground conductor M2, load 30 is grounded to protective neutral PEN via ground conductor M3, load 40 is grounded to protective neutral PEN via ground conductor M4, load 50 is grounded to protective neutral PEN via ground conductor M5, and load 60 is grounded to protective neutral PEN via ground conductor M6.

And S230, reading the electric energy data of the grounding conductor and the protective neutral line collected at each connecting point.

Illustratively, referring to fig. 3 and 4, the power data of the ground conductor and the protective neutral line may be collected by power collecting devices disposed at respective connection points on the protective neutral line PEN, and the power data of the ground conductor includes: current I of the earth conductor Mi_i0Earth voltage U of earth conductor Mi_iAnd the current I of the grounding conductor Mi_i0Voltage U to earth of earth conductor Mi_iPhase angle difference of

Wherein i is more than or equal to 1 and less than or equal to 6; the power data for protecting the neutral line includes: protecting the current I between the connection point I and the connection point t on the neutral line Pit_itAnd current I_itVoltage U to earth of earth conductor Mi_iPhase angle difference of

Wherein i is more than or equal to 1 and less than or equal to 4, t is more than or equal to 2 and less than or equal to 6, and i is less than t.

And S240, calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line.

And S250, identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor.

According to the technical scheme of the embodiment, the number of the grounding conductors in the low-voltage transformer area, the number of the segments of the protection neutral line divided by the connecting points and the connection information between the grounding conductors and the protection neutral line are determined according to the line structure information of the low-voltage transformer area, and the line structure of the low-voltage transformer area is analyzed in detail, so that a basis is provided for acquiring the electric energy data of the grounding conductors and the protection neutral line, the accurate current phase of the grounding conductors is calculated according to the line structure and the electric energy data of the low-voltage transformer area, and the electric leakage identification of the low-voltage transformer area is assisted.

EXAMPLE III

Fig. 5 is a schematic flow chart of another TN-C station area leakage identification method according to an embodiment of the present invention. On the basis of the above embodiments, the present embodiment further optimizes the above leakage identification method. As shown in fig. 5, the method specifically includes:

and S310, acquiring the line structure information of the low-voltage transformer area.

And S320, numbering the grounding conductor, the connection point of the grounding conductor and the protective neutral line and each section of protective neutral line based on the distance between the low-voltage transformer area line and the neutral point of the transformer.

The method for identifying leakage in this embodiment will be described with reference to fig. 4. For example, the transformer has a neutral point N, the number N of ground conductors is obtained according to the line configuration information of the low-voltage transformer area, fig. 4 shows that when N is 6, the ground conductors can be numbered from small to large according to the distance from the ground conductors to the neutral point N of the transformer from near to far, for example, the ground conductors are respectively numbered as M1-M6. Similarly, the connection points of the ground conductor and the protective neutral line PEN may be numbered from small to large according to the distance from the connection point of the ground conductor and the protective neutral line to the neutral point N of the transformer, and the numbering order of the ground conductors may be identical to the numbering order of the connection points, for example, the connection points of the ground conductors M1-M6 and the protective neutral line PEN are numbered 1-6, respectively. The protective neutral PEN may be segmented with the connection points of two adjacent ground conductors to the protective neutral as end points and each segment of the protective neutral is represented by a number of the connection points at both ends, e.g. the connection points 1-6 divide the protective neutral PEN into protective neutral P12, protective neutral P23, protective neutral P35, protective neutral P24 and protective neutral P46.

And S330, determining the connection points of the grounding conductor and the protective neutral line and the connection sequence of each section of protective neutral line according to the numbers.

For example, the connection order of the ground conductor, the connection point of the ground conductor and the protective neutral line, and the protective neutral line may be determined by the electrical leakage recognition system according to the numerical magnitude relationship of the numbers of the ground conductor, the connection point of the ground conductor and the protective neutral line, and the protective neutral line. For example, the number of the grounding conductor is Mi, the number of the connecting point of the grounding conductor and the protective neutral line is i, wherein i is more than or equal to 1 and less than or equal to n, and n is the total number of the grounding conductors; the number of each section of protective neutral line is Pit, wherein t is more than i and less than or equal to n. The smaller number is stored in the array kf and the larger number in the array kt, and the count variable i may be set to 1 first. The leakage identification system can automatically search the serial numbers of the elements which are equal to i in kf, store the elements with the serial numbers corresponding to kt in an array Ti, and if the serial numbers are not searched, mark Ti as 0 to determine the grounding conductor connected with the tail end of the line in the low-voltage transformer area circuit and the serial number corresponding to the grounding conductor; and automatically searching the number of the element which is equal to i in kt, indicating the element with the number corresponding to kf by f, and if the element is not searched, marking f as 0 to determine the grounding conductor connected with the head end of the line in the low-voltage station area line and the corresponding number thereof, and further determining the connection sequence of the grounding conductor, the connection point of the grounding conductor and the protective neutral line and each section of protective neutral line.

And S340, reading the electric energy data of the grounding conductor and the protective neutral line collected at each connecting point.

For example, if Ti ≠ 0, that is, for a ground conductor at the end of a non-line in a low-voltage platform area line, the following data can be acquired by using an electric energy acquisition device installed at the ith connection point in the electric leakage identification system: current I of the earth conductor Mi_i0Earth voltage U of earth conductor Mi_iAnd the current I of the grounding conductor Mi_i0Voltage U to earth of earth conductor Mi_iPhase angle difference of

Wherein i is more than or equal to 1 and less than or equal to n, and n is the total number of the grounding conductors; protecting the current I between the connection point I and the connection point t on the neutral line Pit_itAnd current I_itVoltage U to earth of earth conductor Mi_iPhase angle difference of

Wherein i is more than t and less than or equal to n. If Ti is 0, that is, for the ground conductor at the end of the line in the low-voltage station area line, the following data may be collected by the electric energy collection device installed at the ith connection point in the electric leakage identification system: current I of the earth conductor Mi_i0Earth voltage U of earth conductor Mi_iAnd current of the grounding conductor MiI_i0Voltage U to earth of earth conductor Mi_iPhase angle difference of

And S350, calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line.

For example, according to kirchhoff' S law of current, a current branch formed by two adjacent ground conductors and a section of protective neutral line PEN corresponding to the two adjacent ground conductors in the low-voltage transformer area line is analyzed, and the electric energy data obtained in step S340 is combined to calculate the current I of the ground conductor Mi_i0Phase of

Then, it may be checked whether i is equal to n, and if i is not equal to n, let i be i +1, then steps S330 to S350 may be repeatedly performed to determine the connection order of the ground conductor, the connection point of the ground conductor and the protective neutral line and the sections of the protective neutral line when i is i +1, and the power data of the ground conductor and the protective neutral line, thereby calculating the current phase of the ground conductor. If i is equal to n, step S360 may be performed.

Alternatively, for the first ground conductor in the low-voltage pad, the current phase of the ground conductor is determined according to the phase of the voltage to ground of the ground conductor and the phase angle difference between the current of the ground conductor and the voltage to ground. Specifically, referring to fig. 4, a leading ground conductor in a low-voltage station area, such as ground conductor M1 of transformer 10, may be in accordance with a phase of ground-to-ground voltage U1 of ground conductor M1

And current I of ground conductor M1₁₀Phase angle difference with ground voltage U1

Calculating the current I of the ground conductor M1₁₀Phase of

Illustratively, the current phase of the first grounded conductor is calculated using the following equation:

wherein i is the number of the ground conductor, and i is 1,

the phase of the voltage to ground of the first ground conductor, m is a set reference value,

the current phase of the first grounded conductor,

is the phase angle difference of the current of the first ground conductor and the voltage to ground. Here, the reference value m may be set artificially, for example, m may be set to 0. In this way, it is possible to obtain this only by protecting the electrical energy collection means provided at the connection point 1 on the neutral PEN

The numerical value of (2) to calculate the current phase of the grounding conductor, based on the local measurement data and the phase angle relationship derivation, the data can be put in a reference system for processing, the technical problem of asynchronous data acquisition in the prior art can be effectively avoided, and the accuracy of the electric leakage identification result is favorably improved.

Optionally, for two adjacent ground conductors in the low-voltage transformer area, the current phase of the next ground conductor is calculated according to the numerical relationship between the power data of the last ground conductor, the power data of the next ground conductor and the power data of the protection neutral line between the last ground conductor and the next ground conductor. For example, for the adjacent ground conductor M1 and ground conductor M2 in the low-voltage station area, the ground conductor M1, the protective neutral line P12 and the ground conductor M2 constitute one current branch, and the connection point 1 and the connection point 2 on the protective neutral line P12 can be regarded as current nodes, so that the numerical conversion relationship between the electric energy data of the ground conductor M1, the electric energy data of the ground conductor M2 and the electric energy data of the protective neutral line P12 can be determined based on kirchhoff's current law, thereby calculating the current phase of the ground conductor M2.

Illustratively, the current phase of the other ground conductors except the first ground conductor is calculated using the following formula:

wherein i is more than 1 and less than or equal to n, n is the total number of the grounding conductors, f is the number of the last grounding conductor connected with the ith grounding conductor, and U_fIs the voltage to ground of the f-th ground conductor,

phase of voltage to ground for the f-th ground conductor, R_fiIs the resistance of the protective neutral line between the ith and the fth ground conductors, I_fiFor the current of the protective neutral between the ith and the fth ground conductors,

is I_fiAnd U_fPhase angle difference of (U)_iIs the voltage to ground of the ith ground conductor,

for the phase of the voltage to ground of the ith ground conductor,

is the current phase of the ith ground conductor,

current and U for the ith grounded conductor_iPhase angle difference of (2). Still taking the calculation of the ground conductor M2 as an example, the above calculation process will be explained, and the voltage to ground U of the ground conductor M1 is obtained by equation (1)₁After the phase of (2), the value can be substitutedContinuing the calculation of equation (2) yields the following equation:

wherein, U₁、I₁₂And

the value of (c) can be obtained by protecting the electrical energy collection device arranged at the connection point 1 on the neutral line PEN, U₂And

the value of (2) can be obtained by protecting the electric energy collecting device arranged at the connecting point 2 on the neutral line PEN, and R can be obtained by calculating according to the formula (3)₁₂、

And

the value of (c). Because of U₂And

is a stable value, U₁、I₁₂And

the value of (b) is obtained by the same electric energy collecting device, so that the data are equivalently put in a reference system for processing. Similarly, the current phase of the ground conductor M3 may be calculated according to the numerical conversion relationship between the power data of the ground conductor M2, the power data of the ground conductor M3, and the power data of the protection neutral wire P23, and so on, the current phase of the ground conductor M4 to the ground conductor M6 may be calculated. According to the technical scheme of the embodiment, the current phase calculation of each grounding conductor is placed in the same reference system for processing, so that the problem that the current phases of a plurality of grounding conductors need to be acquired through a collecting device arranged at a different place in the prior art can be effectively avoidedTherefore, the technical problem of data asynchronism is caused, and the accuracy of the electric leakage identification result is improved.

And S360, identifying whether the low-voltage transformer area leaks electricity or not based on the magnitude relation between the set leakage threshold and the current phasor sum of the grounding conductor.

Example four

Fig. 6 is a schematic flow chart of another TN-C station area leakage identification method according to an embodiment of the present invention. On the basis of the above embodiments, the present embodiment further optimizes the above leakage identification method. As shown in fig. 6, the method specifically includes:

and S410, acquiring electric energy data of the grounding conductor and the protective neutral line in the low-voltage transformer area.

And S420, calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line.

And S430, judging and setting the magnitude relation between the leakage threshold and the current phasor sum mode of the grounding conductor.

If the current phasor sum modulus of the grounding conductor is greater than or equal to the set leakage threshold, executing step S440; if the current phasor sum modulus of the grounding conductor is smaller than the set leakage threshold, step S450 is executed.

And S440, judging that the low-voltage transformer area has a leakage condition.

And S450, judging that the low-voltage transformer area normally operates.

Illustratively, the current phasor sum of the ground conductors is calculated as:

wherein I is more than or equal to 1 and less than or equal to n, n is the total number of grounding conductors, I_i0Is the current of the ith ground conductor,

setting leakage threshold value as I for current phase of ith grounding conductor_h. For example, referring to fig. 4, the total number n of ground conductors is 6, the modulus of the sum of the current phasors of the ground conductor M1-ground conductor M6 in the low-voltage station area is calculated, and the ground conductor M1-is groundedModulus of current phasor sum of ground conductor M6 and set leakage threshold I_hComparing, if the modulus of the current phasor sum of the grounding conductor M1-grounding conductor M6 is larger than or equal to the set leakage threshold I_hThen, the current leakage condition of the low-voltage transformer area can be determined; if the modulus of the sum of the current phasors of the grounding conductor M1 and the grounding conductor M6 is less than the set leakage threshold I_hThen it can be determined that the low-voltage station is currently operating normally. Wherein a leakage threshold value I is set_hThe specific numerical value can be set according to specific voltage grade data of the low-voltage transformer area, transformer electric energy parameters, load electric energy parameters and the like. According to the technical scheme, a specific judgment basis is provided for electric leakage identification of the low-voltage transformer area, the electric leakage condition of the low-voltage transformer area can be effectively identified, and reliable technical support is provided for safe operation of the transformer area.

EXAMPLE five

Fig. 7 is a schematic flowchart of another TN-C station area leakage identification method according to an embodiment of the present invention. As shown in fig. 7, the electric leakage detection method includes:

and S510, acquiring the total number of the grounding conductors, and numbering the connection points of the grounding conductors, the protective neutral wires and the grounding conductors from 1-n.

Where n is the total number of ground conductors.

S520, defining that I is more than or equal to 1 and less than or equal to n, and collecting the current I of the grounding conductor Mi_i0Earth voltage U of earth conductor Mi_iCurrent I of the grounding conductor Mi_i0Voltage U to earth of earth conductor Mi_iPhase angle difference of

Protecting the current I between the connection point I and the connection point t on the neutral line Pit_itAnd current I_itVoltage U to earth of earth conductor Mi_iPhase angle difference of

S530, selecting a reference phase of the ground conductor of the transformer to the ground voltage, and calculating phases of other ground conductors to the ground voltage.

And S540, calculating the current phase of each grounding conductor.

And S550, determining the power station area leakage situation according to the leakage identification criterion.

The following describes in detail the leakage identification process of the TN-C station area in this embodiment with specific numerical values. As can be seen from fig. 3 and 4, the transformer area has 1 transformer 10, and 1 protective neutral PEN grounding point is located at 6, and the load magnitude at each location is unknown, the imbalance condition is unknown, and a leakage accident occurs between the connection point 3 and the connection point 5 on the protective neutral PEN. The existence of the leakage accident will be explained by the embodiments of the present invention.

Table 1 is a table of parameters related to leakage identification of TN-C station areas. For convenience of explanation, corresponding arrays of Ti, variables f and data collected by the collecting device located at the ith connecting point of the protective neutral line PEN are listed in Table 1, wherein i is more than or equal to 1 and less than or equal to 6. The data collected by the collecting device comprises: current I of the earth conductor Mi_i0Earth voltage U of earth conductor Mi_iCurrent I of the grounding conductor Mi_i0Voltage U to earth of earth conductor Mi_iPhase angle difference of

Specific values are shown in table 1:

TABLE 1 related parameter table for leakage identification of TN-C station area

Note: "" indicates "none".

Illustratively, the present embodiment sets the neutral point N at the head end of the distribution transformer 10 as a reference zero phase, and uniformly selects the direction from the transformer 10 to the tail end of the line as the positive direction of the current, as shown in fig. 4. Number obtained by Table 1According to the reference positive direction, R can be obtained from the formula (1) and the formula (2) in the above embodiment_fi、

And

i is more than or equal to 1 and less than or equal to 6, and the concrete solution is as follows:

A. when i ═ 1, f ═ 0, combining table 1 with formula (1) can be obtained:

B. when i ═ 2, f ═ 1, combining table 1 with formula (2) can be obtained:

solution: r₁₂＝0.15Ω，

C. When i ═ 3, f ═ 2, combining table 1 with formula (2) can be obtained:

solution: r₂₃＝0.18Ω，

D. When i ═ 4, f ═ 2, combining table 1 with formula (2) can be obtained:

solution: r₂₄＝0.22Ω，

E. When i ═ 5, f ═ 3, combining table 1 with formula (2) can be obtained:

solution: r₃₅＝0.22Ω，

F. When i ═ 6, f ═ 4, combining table 1 with formula (2) can be obtained:

solution: r₄₆＝0.25Ω，

Table 2 is a table of the results of numerical calculations of electrical leakage identification for TN-C block. The results obtained, calculated as above, are collated in Table 2:

TABLE 2 table of the calculation results of the values of the electrical leakage identification of the TN-C block

Note: "" means "none"

The present embodiment exemplarily sets I_hWhen the electric leakage identification criterion of the following formula (4) is satisfied, electric leakage occurs in the station area; otherwise, the platform area operates normally.

The specific calculation process of equation (4) is:

wherein, I_GFor each earth conductorThe modulus of the current phasor sum.

And (4) combining the criterion of the formula (4), and successfully verifying that the electric leakage condition exists in the station area.

To further verify the correctness of the embodiment, if the leakage fault in the distribution room is repaired, the above calculation is performed again under the condition that the phase of the original reference point and the positive direction of the reference current are unchanged, so as to finally obtain I_i0、

The data of (2) are specifically shown in table 3:

TABLE 3

Note: "" represents "empty"

According to equation (4), the electric leakage recognition after electric leakage fault repair is calculated as follows:

wherein, I_GIs the mode of the current phasor sum of the respective ground conductors.

And combining the criterion of the formula (4) to successfully verify that the platform area operates normally at present.

By the technical scheme of the embodiment, the real-time leakage monitoring of the transformer area can be realized, the problem that the TN-C type grounding system of the low-voltage transformer area has the invalid leakage fault identification is solved, and the reliable technical support is provided for the safe operation of the transformer area.

EXAMPLE six

An embodiment of the present invention further provides a TN-C station area leakage identification system, and fig. 8 is a schematic structural diagram of the TN-C station area leakage identification system provided in the embodiment of the present invention. The TN-C station area electric leakage identification system provided by the embodiment of the invention can execute the TN-C station area electric leakage identification method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

As shown in fig. 8, the TN-C station area leakage identification system specifically includes: electric energy data acquisition module 810, current phase computation module 820 and electric leakage identification module 830, wherein:

the power data acquiring module 810 is configured to acquire power data of a ground conductor and a protection neutral line in a low-voltage transformer area, where the power data of the ground conductor includes a current of the ground conductor, a phase angle difference between the current of the ground conductor and the phase angle difference between the current of the protection neutral line and the phase angle difference between the current of the ground conductor, and the connection point of the;

the current phase calculation module 820 is used for calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line;

the leakage identification module 830 is configured to identify whether the low-voltage transformer area leaks electricity based on a magnitude relationship between a set leakage threshold and a sum of current phasors of the ground conductor.

The TN-C station area electric leakage identification system provided by the embodiment of the invention can execute the TN-C station area electric leakage identification method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. And will not be described in detail herein.

EXAMPLE seven

Fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention. Fig. 9 illustrates a block diagram of an exemplary device 912 suitable for use in implementing embodiments of the present invention. The device 912 shown in fig. 9 is only an example and should not bring any limitations to the function and scope of use of the embodiments of the present invention.

As shown in fig. 9, device 912 is in the form of a general purpose device. Components of device 912 may include, but are not limited to: one or more processors 916, a memory device 928, and a bus 918 that couples various system components including the memory device 928 and the processors 916.

Bus 918 represents one or more of any of several types of bus structures, including a memory device bus or memory device controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

Device 912 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by device 912 and includes both volatile and nonvolatile media, removable and non-removable media.

The storage 928 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 930 and/or cache Memory 932. Device 912 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 939 can be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 9, and commonly referred to as a "hard disk drive"). Although not shown in FIG. 9, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk such as a Compact disk Read-Only Memory (CD-ROM), Digital Video disk Read-Only Memory (DVD-ROM) or other optical media may be provided. In these cases, each drive may be connected to the bus 918 through one or more data media interfaces. Storage 928 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.

A program/utility 990 having a set (at least one) of program modules 992 may be stored, for example, in storage 928, such program modules 992 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. The program modules 992 generally perform the functions and/or methodologies of the described embodiments of the invention.

Device 912 may also communicate with one or more external devices 919 (e.g., keyboard, pointing terminal, display 929, etc.), and may also communicate with one or more terminals that enable a user to interact with device 912, and/or with any terminals (e.g., Network card, modem, etc.) that enable device 912 to communicate with one or more other computing terminals.

The processor 916 executes various functional applications and data processing by running a program stored in the storage device 928, for example, implementing a TN-C station area leakage identification method provided by an embodiment of the present invention, the method including:

acquiring electric energy data of a ground conductor and a protection neutral line in a low-voltage transformer area, wherein the electric energy data of the ground conductor comprises current and voltage to ground of the ground conductor and phase angle difference between the current and the voltage to ground of the ground conductor, the electric energy data of the protection neutral line comprises current between connection points on the protection neutral line and phase angle difference between the current and the voltage to ground of the ground conductor, and the connection points on the protection neutral line are connection points of the ground conductor and the protection neutral line;

calculating the current phase of the grounding conductor according to the electric energy data of the grounding conductor and the protective neutral line;

Example eight

The embodiment of the invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for identifying the leakage of the TN-C station area provided by the embodiment of the invention is implemented, and the method comprises the following steps:

Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including AN object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A TN-C platform district electric leakage identification method is characterized by comprising the following steps:

2. The TN-C block area electric leakage identification method of claim 1, characterized in that, acquiring electric energy data of a ground conductor and a protective neutral line in a low-voltage block area includes:

acquiring line structure information of a low-voltage transformer area;

3. The TN-C block electric leakage recognition method of claim 2, wherein determining the number of the ground conductors, the number of segments of the protection neutral line divided by the connection point, and the connection information between the ground conductors and the protection neutral line in a low-voltage block comprises:

4. The TN-C station area electric leakage recognition method of claim 3,

for the first ground conductor in the low-voltage transformer area, determining the current phase of the ground conductor according to the phase of the voltage to ground of the ground conductor and the phase angle difference between the current and the voltage to ground of the ground conductor;

5. The TN-C station area electric leakage recognition method of claim 4,

calculating the current phase of the first said earth conductor using the formula:

wherein i is the number of the ground conductor, and i is 1,

is a first oneA phase of a voltage to ground of the ground conductor, m is a set reference value,

the current phase of the first of said ground conductors,

for the phase of the voltage to ground of the ith said ground conductor,

for the current phase of the ith said earth conductorThe number of bits is,

6. The TN-C block area electric leakage identification method of claim 1, characterized in that, identifying whether a low-voltage block area is electric leakage based on a magnitude relation between a set electric leakage threshold and a sum of current phasors of the grounding conductors includes:

7. The TN-C block area electric leakage identification method of claim 6, characterized in that the sum of the current phasors of the ground conductors is calculated as:

is the current phase of the ith said ground conductor.

8. A TN-C platform district electric leakage identification system characterized by includes:

9. An apparatus, characterized in that the apparatus comprises:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the TN-C station area leakage identification method as recited in any one of claims 1 to 7.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a TN-C station area leakage identification method according to any one of claims 1 to 7.