CN111768599A

CN111768599A - AC380V loop electric safety control method and system

Info

Publication number: CN111768599A
Application number: CN202010650460.4A
Authority: CN
Inventors: 许浒
Original assignee: Anhui Xianzhao Technology Co ltd
Current assignee: Anhui Xianzhao Technology Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-10-13
Anticipated expiration: 2040-07-08
Also published as: CN111768599B

Abstract

The invention provides an AC380V loop electric safety control method and system, and relates to the technical field of electric safety control. The method comprises the following steps: collecting real-time electrical signals of the monitored AC380V loop; the chip processes the real-time electric signal to obtain real-time data, alarm event data and time period data, wherein the time period data comprise the integral of three-phase fundamental wave residual active electric energy (Ua Is + cosA + Ub Is + cosB + Uc Is) in the window width of a jump window, and the integral Is used for measuring the real electric fire risk of a measured AC380V loop in the window width of the jump window; and summarizing and storing the real-time data, the alarm event data and the time interval data of the loop through a cloud server, and displaying the data according to a page design for a user to read and analyze. The invention solves the problem that the electric system in the prior art is easy to miss report or underestimate the potential electrical safety hazard in the state of higher load voltage, and realizes more accurate alarm and early warning of the potential electrical safety hazard of the electric system.

Description

AC380V loop electric safety control method and system

Technical Field

The invention relates to the technical field of electric safety control, in particular to an AC380V loop electric safety control method and system.

Background

In various safety accidents at the present stage of China, the number and the harmfulness of electric safety accidents such as electric fires are far from the first place. Moreover, because the electrical fire has the characteristics of strong concealment, quick combustion, difficulty in extinguishing and the like, people can be aware of the importance of safety control work such as electrical fire monitoring and the like.

At present, electrical safety monitoring work is well done, people start to introduce new electrical monitoring indexes on the basis of residual current and temperature detection technologies, and different factors causing electrical safety accidents are considered in multiple directions. For example, the invention patent with the publication number of CN109596947A entitled "a method and a device for monitoring and early warning of electrical insulation aging based on insulation conductance" introduces the time integral index of insulation conductance, so as to realize early warning and monitoring of electrical insulation aging and further help people to find electrical potential safety hazards in time.

However, the applicant of the present invention finds that in the technical field of electrical safety control, especially in an AC380V loop, it is far from sufficient to increase the measurement of the insulation factor for warning and early warning of electrical safety accidents such as electrical fire. Because this easily leads to the electrical safety problem that the power consumption system appears to miss reporting or underestimate existence under the condition that the load voltage is higher.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an AC380V loop electric safety control method and system, which solve the problem of electric safety hidden trouble existing in an electric system in the prior art, wherein the electric system is easy to miss report or underestimate under the condition of higher load voltage.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

an AC380V loop electric safety control method comprises the following steps:

s1, acquiring a real-time electric signal of the monitored AC380V loop, filtering the real-time electric signal by a signal conditioning circuit, and inputting the real-time electric signal into a chip with an electric energy metering function, wherein the real-time electric signal comprises a three-phase load current, a three-phase load voltage and a residual current signal;

s2, the chip processes the real-time electric signal to obtain real-time data, and the method specifically comprises the following steps:

s21, the chip samples the real-time electric signal and calculates the effective value of the sliding window, the sliding scale of the sliding window is all the preset time period, the chip continuously calculates the real-time electric signal to obtain the real-time data, meanwhile, the chip judges the real-time data every other sliding scale according to the preset threshold value group to generate the alarm event data in real time,

the alarm event comprises overvoltage of phase A or phase B or phase C, undervoltage of phase A or phase B or phase C, overcurrent and electric leakage of phase A or phase B or phase C,

the real-time data comprises three-phase full-wave load voltage, three-phase fundamental wave load voltage U_a、U_b、U_cThree-phase full-wave load current, three-phase fundamental load current I_a、I_b、I_cFull-wave residual current, fundamental residual current I_sIndex group, chip including module for calculating active power, generating three-phase fundamental active power, and combining with U_a、U_b、U_c、I_sGenerating an index group, wherein the index group is used for selecting lines of corresponding fault points of the electric leakage alarm event,

s22, the chip samples the real-time electric signals and calculates window jumping time integral, the window width of a window jumping is a preset time period, the chip calculates the real-time electric signals every window jumping width of the window to generate time period data, the time period data comprise three-phase fundamental wave residual active electric energy, and the three-phase fundamental wave residual active electric energy is used for measuring the real electric fire risk of a loop in the window jumping width.

and if the | cosA | ═ cosB | ═ cosC |, judging that the corresponding fault point of the leakage alarm event is in any phase.

Preferably, the three-phase fundamental wave residual active power in step S22 Is an integral of (Ua | _ cosA | + Ub | _ Is | _ cosB | + Uc | _ Is | _ cosC |) over the window width of the jump window, and Is recorded as

the measurement specifically means: and comparing the residual active electric energy of the three-phase fundamental wave with a preset threshold value, and judging that the loop has a real electrical fire risk when the residual active electric energy of the three-phase fundamental wave is higher than the preset threshold value.

Preferably, in step S22, the period data further includes an integral of | cosA |, | cosB |, | cosC | within the window width of the jump window, which is recorded as | cosA |, | cosB |, | cosC |, | cosA |, | looks | α |, | looks | and | cosC | for determining that the phase with the greatest risk of the true electrical fire occurs within the window width of the jump window, and specifically determining that the phase with the greatest risk of the true electrical fire occurs within the window width of the jump window refers to: comparing the magnitude of | CosA |, | CosB |, | CosC | and,

if | cosA | > | cosB | ≧ | cosC |, then it is determined that the phase in which the risk of occurrence of a true electrical fire within the window width of the jump window is the a phase,

if | cosA | > | cosB | > | cosC |, then it is determined that the phase with the greatest risk of a true electrical fire occurring within the window width of the jump window is not the C phase,

if | cosA | ═ cosB | ═ cosC |, then it is judged that the risk of a true electrical fire occurring within the window width of the jump window is three-phase equivalent.

Preferably, the real-time electrical signal in step S1 further includes a temperature signal of the three-phase line and the zero line, the real-time data further includes real-time temperature data of the three-phase line and the zero line, and the alarm event further includes an over-temperature of the loop phase a, B, C, or the zero line.

Preferably, the step S1 further includes uploading the real-time data to the cloud server; step S21 also includes uploading alarm event data and index groups to the cloud server; step S22 further includes uploading the time interval data to the cloud server;

the method further comprises the following steps:

and S3, collecting and storing the real-time data, the alarm event data and the time interval data of the loop through the cloud server, and displaying the data according to the page design for the user to read and analyze.

Preferably, in step S3, the cloud server is further configured to perform unread continuous prompt, count according to a preset time period, and design a full closed-loop handling process for the alarm event data; the monitoring system is also used for automatically generating monitoring data reports available for downloading at regular intervals; the system is also used for generating an early warning event based on the time interval data and the hidden danger analysis expert system, displaying the early warning event, continuously prompting unread events, counting according to a preset time interval and designing a full closed loop treatment process; the method is also used for developing intelligent hidden danger diagnosis and hidden danger disposal method intelligent suggestion functions based on real-time data, alarm event data, time interval data, early warning event counting and hidden danger analysis expert systems of loops.

An AC380V loop electric safety control system comprises a monitoring terminal;

the monitoring terminal is used for collecting real-time electric signals of the monitored AC380V loop, calculating and generating real-time data, alarm event data and time interval data according to the real-time electric signals, wherein the real-time electric signals comprise three-phase load current, three-phase load voltage and residual current signals,

the monitoring terminal comprises a mutual inductor group, an edge calculation module, an acousto-optic alarm module and a cloud communication module, the mutual inductor group, the acousto-optic alarm module and the cloud communication module are respectively connected with the edge calculation module, the edge calculation module outputs a corresponding alarm instruction through the acousto-optic alarm module, the cloud communication module is used for receiving real-time data, alarm event data and time interval data and transmitting the real-time data, the alarm event data and the time interval data to a cloud server,

the transformer group comprises a load voltage transformer group, a load current transformer group and a residual current transformer, the transformer group is used for collecting real-time electric signals,

the edge computing module comprises a signal conditioning circuit and a chip with an electric energy metering function, the signal conditioning circuit and the chip are connected with each other, the signal conditioning circuit is used for filtering a real-time electric signal and inputting the filtered signal into the chip,

the chip processes the real-time electric signal to obtain real-time data, and the method specifically comprises the following steps:

the chip is used for sampling the real-time data and calculating the effective value of the sliding window, the sliding scale of the sliding window is a preset time period, the chip continuously calculates the real-time electric signal to obtain the real-time data, simultaneously judges the real-time data every other sliding scale according to a preset threshold value group, generates alarm event data in real time, the alarm event comprises overvoltage of A phase or B phase or C phase, undervoltage of A phase or B phase or C phase, overcurrent and electric leakage of A phase or B phase or C phase in a loop, and outputs a corresponding real-time alarm instruction to the acousto-optic alarm module according to the type of the alarm event,

the real-time data comprises three-phase full-wave load voltage, three-phase fundamental wave load voltage U_a、U_b、U_cThree-phase full-wave load current, three-phase fundamental load current I_a、I_b、I_cFull-wave residual current, fundamental residual current I_sA set of indicators,

the chip comprises a module for calculating single-phase active power, generating three-phase fundamental active power, and combining U_a、U_b、U_c、I_sGenerating an index group, wherein the index group is used for selecting lines of corresponding fault points of the electric leakage alarm event,

the chip is also used for sampling the real-time electric signals and calculating window-jumping time integral, the window width of the window-jumping is a preset time period, the chip calculates the real-time electric signals every window width of the window-jumping to obtain real-time data, the time period data comprises three-phase fundamental wave residual active electric energy, and the three-phase fundamental wave residual active electric energy is used for measuring the real electric fire risk of a loop in the window width of the window-jumping.

Preferably, the three-phase fundamental residual active power Is (Ua | + Is | + cosB | + Uc | + Is | -cosC |) integrated over the window width of the jump window, and Is recorded as

the measurement specifically means: comparing the residual active electric energy of the three-phase fundamental wave with a preset threshold value, and judging that the loop has a real electrical fire risk when the residual active electric energy of the three-phase fundamental wave is higher than the preset threshold value;

(III) advantageous effects

The invention provides an AC380V loop electric safety control method and system. Compared with the prior art, the method has the following beneficial effects:

1. when the electric leakage alarm occurs, the invention introduces an index group: the absolute values | cosA |, | cosB |, and | cosC |, of the cosine of the phase angle difference between the load voltage of each phase of the fundamental wave and the residual current of the fundamental wave of the AC380V loop are compared, so that the corresponding fault point of the electric leakage alarm event can be judged at the same time, the troubleshooting efficiency can be improved, and the system applicability is enhanced.

2. The embodiment of the invention introduces an index group: the absolute values | cosA |, | cosB |, and | cosC |, of the cosine of the phase angle difference between the load voltage of each phase of fundamental wave and the residual current of the fundamental wave of the AC380V loop take the capacitive interference in the monitored AC380V loop into consideration, and effectively avoid the risk that the electrical safety hidden danger is generated by false alarm or the electrical safety hidden danger is generated by overestimation when the capacitive interference of the fundamental wave of the power consumption system is large.

3. According to the invention, the index of the three-phase fundamental wave residual active electric energy is introduced and compared with the preset threshold value, and when the three-phase fundamental wave residual active electric energy is higher than the preset threshold value, the real electric fire risk of the AC380V loop is judged, so that the real electric fire risk under the conditions of high voltage and high capacitance interference can be measured more accurately; and meanwhile, the time integrals of the absolute values | cosA |, | cosB |, and | cosC | of the cosine of the phase angle difference between the load voltage of each phase of the AC380V loop and the residual current of the fundamental wave in the preset time period are calculated, and the magnitude relation of the absolute values | cosA |, | cosB |, and | cosC | in the time period is calculated, so that one phase with the maximum risk of real electric fire can be synchronously given out, the accuracy of early warning and monitoring is improved, and the applicability of the system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of an embodiment of a method for controlling electrical safety of an AC380V loop;

FIG. 2 is a schematic structural diagram of an embodiment of an AC380V loop electrical safety control system;

FIG. 3 is a schematic structural diagram of an embodiment of an edge calculation module;

fig. 4 is a schematic structural diagram of another embodiment of an AC380V loop electrical safety control system.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the application provides the AC380V loop electric safety management and control method and the system, so that the problem of electric safety hidden dangers existing in the prior art that an electric system is prone to missing report or underestimating under the condition of high load voltage is solved, and the electric safety hidden dangers of the electric power system can be accurately warned and early warned.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

in the embodiment of the invention, when electric leakage alarm occurs, by introducing an index group: the absolute values | cosA |, | cosB |, and | cosC |, of the cosine of the phase angle difference between the load voltage of each phase of the fundamental wave and the residual current of the fundamental wave of the AC380V loop are compared, so that the corresponding fault point of the electric leakage alarm event can be judged at the same time, the troubleshooting efficiency can be improved, and the system applicability is enhanced. The embodiment of the invention also introduces the index of the three-phase fundamental wave residual active electric energy, compares the index with the preset threshold value, and judges that the AC380V loop has the real electric fire risk when the three-phase fundamental wave residual active electric energy is higher than the preset threshold value, thereby being capable of more accurately measuring the real electric fire risk under the conditions of high voltage and high capacitance interference; and meanwhile, the time integrals of the absolute values | cosA |, | cosB |, and | cosC | of the cosine of the phase angle difference between the load voltage of each phase of the AC380V loop and the residual current of the fundamental wave in the preset time period are calculated, and the magnitude relation of the absolute values | cosA |, | cosB |, and | cosC | in the time period is calculated, so that one phase with the maximum risk of real electric fire can be synchronously given out, the accuracy of early warning and monitoring is improved, and the applicability of the system is improved.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

Example 1:

the embodiment of the invention provides an electric safety control method for an AC380V loop, as shown in FIG. 1, the method comprises the following steps:

and S1, acquiring a real-time electric signal of the monitored AC380V loop, filtering the real-time electric signal by a signal conditioning circuit, and inputting the real-time electric signal into a chip with an electric energy metering function.

The real-time electric signals comprise three-phase load current, three-phase load voltage, residual current signals and three-phase line and zero line temperature signals.

S2, the chip processes the real-time electric signal, which specifically comprises:

s21, the chip samples the real-time electric signal and calculates the effective value of the sliding window, the window width and the sliding scale of the sliding window are both preset time periods, wherein the window width is 0.5 second, namely 25 cycles, and the sliding scale is 0.005 second, namely one quarter of cycle. The chip continuously calculates real-time electric signals to obtain real-time data, the register is updated for 1 time every 1 second, meanwhile, the real-time data are judged every other sliding scale, namely 0.005 second according to a preset threshold value group, 5 types of alarm event data are generated in real time and uploaded to a cloud server, and the alarm event comprises overvoltage of an A phase or a B phase or a C phase, undervoltage of the A phase or the B phase or the C phase, overcurrent and leakage of the A phase or the B phase or the C phase, and overtemperature of the A phase or the B phase or the C phase or zero phase in a loop.

The real-time data comprises three-phase full-wave load voltage and three-phase fundamental wave load voltage U_a、U_b、U_cThree-phase full-wave load current, three-phase fundamental load current I_a、I_b、I_cFull wave residual current, fundamental residual currentStream I_sIndex group, three phase line and zero line temperature real-time data.

Each threshold in the preset threshold group corresponds to real-time data one by one, and specifically comprises a three-phase full-wave load voltage threshold, a three-phase fundamental wave load voltage threshold, a three-phase full-wave load current threshold, a three-phase fundamental wave load current threshold, a full-wave residual current threshold, a fundamental wave residual current threshold, and a three-phase line and zero line temperature real-time data threshold.

The chip comprises a module which can be used for calculating single-phase active power and generating three-phase fundamental active power P_a、P_b、P_cCombined with U_a、U_b、U_c、I_sGenerating the index group: u shape_aAnd I_sCosine absolute values of phase angle differences | cosA |, U_bAnd I_sCosine absolute values of phase angle differences | cosB |, U_cAnd I_sCosine absolute value of phase angle difference | cosC |, where

|cosA|＝|P_a/(U_a*I_s)|，|cosB|＝|P_b/(U_b*I_s)|，|cosC|＝|P_c/(U_c*I_s)|

The index group is used for selecting lines of corresponding fault points of the electric leakage alarm event, and specifically comprises the following steps: comparing the sizes of the | cosA |, | cosB |, and | cosC |,

S22, the chip samples the real-time electric signal and calculates the time integral of the jump window, the window width of the jump window is a preset time period, and the window width of the jump window is 1 hour. The chip calculates real-time data every 1 hour, generates time interval data and uploads the time interval data to the cloud server, the time interval data comprises integral of three-phase fundamental wave residual active electric energy (Ua Is + CosA + Ub Is + CosB + Uc Is + CosC) in the 1 hour, and Is marked as ^ integral ((Ua Is + CosA + Ub Is + CosB + Uc Is) CosC), and the three-phase fundamental wave residual active electric energy Is used for measuring the real electric fire risk of the loop in the window width of the jump window, specifically:

and comparing the residual active electric energy of the three-phase fundamental wave with a preset threshold value, and judging that the loop has a real electrical fire risk when the residual active electric energy of the three-phase fundamental wave is higher than the preset threshold value. The preset threshold value is determined according to a specific application scenario of the AC380V loop, for example, with reference to a recommended value of a three-level power distribution leakage alarm threshold value 30mA specified by national standard of China, the value of 30mA multiplied by 220v multiplied by 3 is integrated according to a preset time period, so that a preset threshold value is obtained, and when the residual active power of the three-phase fundamental wave is higher than the value, the total energy output by the monitored AC380V loop in the form of leakage heating exceeds a leakage standard specified by the national standard within the preset time period, attention needs to be paid, so that the true electrical fire risk of the monitored AC380V loop can be measured. It should be noted that the national standard is a recommended standard rather than a mandatory standard, and therefore, the embodiment of the present invention does not make a unique limitation on the preset threshold.

The period data further includes | cosA |, | cosB |, | cosC | integral within a window width of the jump window, that is, within one hour, which is recorded as | cosA |, | cosB |, | cosC |, | cosA |, | cosB |, | cosC |, | cosB |, and | cosC | for determining a phase with the greatest risk of the occurrence of the real electrical fire within the window width of the jump window, specifically: comparing the magnitudes of | cosA |, | cosB |, | cosC | and |,

if | cosA | > | cosB | ≧ | cosC |, then it is determined that the phase with the greatest risk of occurrence of a true electrical fire within the window width of the jump window is phase a,

if | cosA | ═ cosB | ═ cosC |, then it is judged that the risk of a true electrical fire occurring within the window width of the jump window is three-phase equivalence.

And S3, collecting and storing the real-time data, the alarm event data and the time interval data of the loop through the cloud server, and displaying the real-time data, the alarm event data and the time interval data according to a page design for a user to read and analyze.

The cloud server is further used for conducting unread continuous prompt, counting according to a preset time period and designing a full closed loop disposal process according to the alarm event data; the monitoring system is also used for automatically generating monitoring data reports available for downloading at regular intervals; the System is also used for generating an early warning event based on the time period data and a hidden danger analysis Expert System (Expert System), and carrying out display, unread continuous prompt, counting according to a preset time period and designing a full closed loop treatment process on the early warning event; and the intelligent warning system is also used for developing intelligent hidden danger diagnosis and hidden danger treatment method intelligent suggestion functions based on real-time data, alarm event data, time interval data and the early warning event count of the loop and the hidden danger analysis expert system (expert system). The hidden danger analysis Expert System (Expert System) comprises a hidden danger diagnosis rule base.

In addition, in the step S2, the chip is further configured to continuously calculate real-time electrical signals, such as three-phase load current, three-phase load voltage, and residual current signals, and three-phase line and zero line temperature signals, and upload real-time data of the monitored AC380V loop through the cloud communication module or the communication terminal when receiving an inquiry instruction sent by the cloud server. Wherein the real-time data comprises, in total: the real-time data comprises 21 groups of real-time data of full waves, fundamental waves and harmonic effective values of three-phase load voltage, three-phase load current and residual current, 27 groups of real-time data of full waves, fundamental waves and harmonic effective values of three-phase apparent power, three-phase active power and three-phase reactive power, 4 groups of real-time data of three-phase line and zero line temperature, and 3 groups of real-time data of absolute values | cosA |, | cosB |, | cosC | of cosine of a phase angle of each phase of fundamental load voltage and fundamental residual current.

Example 2:

the embodiment of the invention provides an AC380V loop electric safety control system, as shown in fig. 2, the system includes: the system comprises a monitoring terminal, a cloud server and a display and control terminal, wherein the monitoring terminal, the cloud server and the display and control terminal are sequentially connected.

The monitoring terminals are deployed at all levels of distribution boxes and distribution cabinets of the low-voltage alternating-current system and used for acquiring real-time electric signals of the monitored AC380V loop, uploading the real-time electric signals to the cloud server, calculating, generating and uploading alarm event data and time interval data according to the real-time electric signals, and uploading the alarm event data and the time interval data to the cloud server.

The monitoring terminal comprises a mutual inductor group, an edge calculation module, an acousto-optic alarm module, a cloud communication module, a display screen and a key module, a power supply module, a temperature sensor group and a shunt tripping circuit breaker, the mutual inductor group, the acousto-optic alarm module, the cloud communication module, the display screen and the key module, the power supply module, the temperature sensor group and the shunt tripping circuit breaker are respectively connected with the edge calculation module, the edge calculation module outputs corresponding alarm instructions according to the types of alarm events and through the acousto-optic alarm module, the edge calculation module executes corresponding operations according to the display screen and the key module, a cloud server or instructions input by a display and control terminal, for example, specific instructions are output to a designated module, and specific data or information is displayed through the display screen and the key module or the display and control terminal.

The transformer group consists of a plurality of groups of three-phase loop monitoring transformer groups, each group of three-phase loop monitoring transformer group comprises 3 load voltage transformer groups, 3 load current transformer groups and 1 residual current transformer which are respectively used for acquiring real-time electric signals corresponding to loops, wherein the real-time data comprises three-phase load current, three-phase load voltage and residual current signals,

the temperature sensor group is composed of a plurality of groups of AC380V loop temperature sensor groups, each group of AC380V loop temperature sensor groups comprises 3 phase line temperature sensors and 1 zero line temperature sensor, and the three phase line temperature sensors and the zero line temperature sensors are respectively used for acquiring three phase line temperature signals and zero line temperature signals of the monitored AC380V loop.

As shown in fig. 3, the edge computing module includes a signal conditioning circuit and a chip with an electric energy metering function, the signal conditioning circuit and the chip are connected to each other, the signal conditioning circuit is used for filtering the real-time data and inputting the filtered real-time data into the chip, and the chip is of the type ATT 7022E.

The chip samples the real-time electric signal and calculates the effective value of the sliding window, the window width and the sliding scale of the sliding window are both preset time periods, wherein the window width is 0.5 seconds, namely 25 cycles, and the sliding scale is 0.005 seconds, namely one quarter of a cycle. The chip continuously calculates real-time data obtained by real-time electric signals, the register is updated for 1 time every 1 second, meanwhile, the real-time data is judged every other sliding scale, namely 0.005 second, according to a preset threshold value group, 5 types of alarm event data are generated in real time and uploaded to a cloud server, and the alarm event comprises overvoltage of an A phase or a B phase or a C phase, undervoltage of the A phase or the B phase or the C phase, overcurrent and leakage of the A phase or the B phase or the C phase, and overtemperature of the A phase or the B phase or the C phase or zero phase in a loop.

The real-time data comprises three-phase full-wave load voltage and three-phase fundamental wave load voltage U_a、U_b、U_cThree-phase full-wave load current, three-phase fundamental load current I_a、I_b、I_cFull-wave residual current, fundamental residual current I_sAnd index group.

The chip comprises a module for calculating single-phase active power and generating three-phase fundamental active power P_a、P_b、P_cCombined with U_a、U_b、U_c、I_sGenerating the index group: u shape_aAnd I_sCosine absolute values of phase angle differences | cosA |, U_bAnd I_sCosine absolute values of phase angle differences | cosB |, U_cAnd I_sCosine absolute value of phase angle difference | cosC |, where

|cosA|＝|P_a/(U_a*I_s)|，|cosB|＝|P_b/(U_b*I_s)|，|cosC|＝|P_c/(U_c*I_s)|

The index group is introduced, the capacitive inductance interference in the monitored AC380V loop is considered, and the risk that the electrical safety hidden danger is generated by false alarm or is generated by overestimation when the fundamental wave capacitive inductance interference of the power utilization system is large is effectively avoided.

The chip is also used for sampling the real-time electric signals and calculating the time integral of the jump window, the window width of the jump window is a preset time period, and the window width of the jump window is 1 hour. The chip calculates a real-time electric signal every 1 hour, generates time period data and uploads the time period data to the cloud server, the time period data comprises integral of three-phase fundamental wave residual active electric energy (Ua Is + CosA + Ub Is + CosB + Uc Is + CosC) in the 1 hour, and Is marked as ^ integral ((Ua Is + CosA + Ub Is + CosB + Uc Is) and CosC), and the three-phase fundamental wave residual active electric energy Is used for measuring the real electric fire risk of the loop in the window width of the jump window, specifically:

and comparing the residual active electric energy of the three-phase fundamental wave with a preset threshold value, and judging that the loop has a real electrical fire risk when the residual active electric energy of the three-phase fundamental wave is higher than the preset threshold value. The preset threshold value is determined according to the specific application scenario of the AC380V loop, for example, with reference to a recommended value of three-level power distribution single-phase leakage alarm threshold value 30mA specified by national standard of China, the value of 30mA multiplied by 220V multiplied by 3 is integrated according to a preset time period, so that a preset threshold value is obtained, and when the residual active electric energy of the three-phase fundamental wave is higher than the value, the total energy output by the monitored AC380V loop in the form of leakage heating exceeds the safety standard specified by the national standard within the preset time period, attention needs to be paid, and therefore the actual electrical fire risk of the monitored AC380V loop can be measured. It should be noted that the national standard is a recommended standard rather than a mandatory standard, and therefore, the embodiment of the present invention does not make a unique limitation on the preset threshold.

The sound and light alarm module comprises a buzzer and an LED lamp and is used for receiving the instruction output by the edge calculation module to carry out different kinds of sound and light alarm.

The display screen and key module comprises a liquid crystal display screen and a keyboard and is used for displaying specific data or information according to the instruction output by the edge calculation module and inputting the instruction to the edge calculation module.

The shunt tripping circuit breaker is used for breaking a circuit according to the instruction output by the edge calculation module.

The power supply module consists of a main power supply, a standby battery and a relay switch and is used for supplying power to the monitoring terminal, and the standby battery and the relay switch can enable the monitoring terminal to work for a period of time in a delayed mode after the main power supply is powered off, so that the system has a power-off notification function.

The cloud communication module is used for receiving real-time data, alarm event data and time interval data, transmitting the real-time data, the alarm event data and the time interval data to the cloud server, receiving a command sent by the cloud server and transmitting the command to the edge computing module. In the embodiment of the invention, the cloud communication module is matched with a model with a protocol compatibility function, and particularly the cloud communication module can be simultaneously connected with monitoring equipment of other cloud computing architectures, such as a microcomputer comprehensive protection device, a smoke detector, a combustible gas alarm, a fire water level sensor, a flowmeter and the like, so as to carry out cloud communication.

And the cloud server is used for summarizing and storing the real-time data, the alarm event data and the time interval data. In the embodiment of the invention, the cloud server is deployed in a third-party cloud computing platform (such as Alice cloud) or a server room specified by a user, is used for deploying cloud platform software matched with the system, and has the following functions:

the real-time data, the alarm event data and the time interval data of the loop are collected and stored, and are displayed according to the page design for a user to read and analyze; performing unread continuous prompt, counting according to a preset time period and designing a full closed loop disposal process aiming at the alarm event data; automatically generating a monitoring data report available for downloading at regular intervals; generating an early warning event based on the time period data and a hidden danger analysis Expert System (Expert System), and displaying, continuously prompting unread, counting according to a preset time period and designing a fully closed loop treatment process for the early warning event; and developing intelligent hidden danger diagnosis and hidden danger disposal method intelligent suggestion functions based on real-time data, alarm event data, time interval data and the early warning event count of the loop and the hidden danger analysis Expert System (Expert System). The hidden danger analysis Expert System (Expert System) comprises a hidden danger diagnosis rule base.

The display and control terminal comprises a desktop computer, a notebook computer, a tablet computer, a mobile phone or a special handheld inspection terminal which is connected with the cloud server in a wired or wireless communication mode, is deployed at a position designated by a user or carried by a designated person of the user, and is used for displaying specific data or information in a page design mode of cloud platform software matched with the system and inputting instructions to the cloud server.

In addition, the edge calculation module is further used for continuously calculating real-time electric signals of three-phase load current, three-phase load voltage and residual current signals and three-phase line and zero line temperature signals, and uploading real-time data of the monitored AC380V loop through the communication terminal or the cloud communication module when receiving an inquiry instruction sent by the cloud server. Wherein the real-time data comprises, in total: the real-time data comprises 21 groups of real-time data of full waves, fundamental waves and harmonic effective values of three-phase load voltage, three-phase load current and residual current, 27 groups of real-time data of full waves, fundamental waves and harmonic effective values of three-phase apparent power, three-phase active power and three-phase reactive power, 4 groups of real-time data of three-phase line and zero line temperature, and 3 groups of real-time data of absolute values | cosA |, | cosB |, | cosC | of cosine of a phase angle of each phase of fundamental load voltage and fundamental residual current.

In addition, an embodiment of the present invention further provides an AC380V loop electrical safety management and control system, as shown in fig. 4, the system includes: the system comprises a non-independent monitoring terminal, a communication terminal, a cloud server and a display and control terminal, wherein the non-independent monitoring terminal, the communication terminal, the cloud server and the display and control terminal are sequentially connected. It should be understood that the communication terminal herein may be regarded as a cloud communication module replacing the monitoring terminal in the above embodiments, rather than a networking communication module inside the independent monitoring terminal replacing the cloud communication module.

The networking communication module is a protocol converter or a communication chip, supports common wired communication modes such as RS485 and CAN bus, and CAN also be selectively configured to support other wired communication modes such as RS232 or wireless communication modes such as bluetooth and WIFI.

The combination of the non-independent monitoring terminal and the communication terminal is equivalent to the monitoring terminal in the above embodiment, and the working principles of the whole schemes of the two are completely consistent. Therefore, it can be regarded as a variation of the above embodiment, and is not described herein.

Compared with the prior art, the method has the following beneficial effects:

1. in the embodiment of the invention, when electric leakage alarm occurs, by introducing an index group: the absolute values | cosA |, | cosB |, and | cosC |, of the cosine of the phase angle difference between the load voltage of each phase of the fundamental wave and the residual current of the fundamental wave of the AC380V loop are compared, so that the corresponding fault point of the electric leakage alarm event can be judged at the same time, the troubleshooting efficiency can be improved, and the system applicability is enhanced.

3. According to the embodiment of the invention, the index of the three-phase fundamental wave residual active electric energy is introduced and compared with the preset threshold value, and when the three-phase fundamental wave residual active electric energy is higher than the preset threshold value, the AC380V loop is judged to have a real electric fire risk, so that the real electric fire risk under the conditions of high voltage and high capacitance interference can be measured more accurately; meanwhile, the time integrals of the absolute values | cosA |, | cosB |, and | cosC | of the cosine of the phase angle difference between the load voltage of each phase of the AC380V loop and the residual current of the fundamental wave in the preset time period are calculated, and the magnitude relation of the three values is calculated, so that one phase with the maximum risk of real electric fire can be synchronously given out, the accuracy of early warning monitoring is improved, and the applicability of the system is improved

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An AC380V loop electric safety control method, characterized in that the method comprises:

s1, collecting a real-time electric signal of the monitored AC380V loop, filtering the real-time electric signal by a signal conditioning circuit, and inputting the real-time electric signal into a chip with an electric energy metering function, wherein the real-time electric signal comprises three-phase load current, three-phase load voltage and a residual current signal;

s2, the chip processes the real-time electric signal to obtain real-time data, and the specific steps include:

s21, the chip samples the real-time electric signal and calculates the effective value of the sliding window, the sliding scale of the sliding window is a preset time period, the chip continuously calculates the real-time electric signal to obtain the real-time data, meanwhile, according to a preset threshold value group, the real-time data is judged every other sliding scale, and alarm event data is generated in real time,

the alarm event comprises overvoltage of phase A or phase B or phase C, undervoltage of phase A or phase B or phase C, overcurrent and leakage of phase A or phase B or phase C in the loop,

the real-time data comprises three-phase full-wave load voltage and three-phase fundamental wave load voltage U_a、U_b、U_cThree-phase full-wave load current, three-phase fundamental load current I_a、I_b、I_cFull-wave residual current, fundamental residual current I_sA set of indicators,

the chip comprises a module for calculating active power, generating three-phase fundamental active power, and combining the U_a、U_b、U_c、I_sGenerating the index group, wherein the index group is used for selecting lines of corresponding fault points of the electric leakage alarm event,

s22, the chip samples the real-time electric signal and calculates window jump time integral, the window width of the window jump is a preset time period, the chip calculates the window width of the window jump to generate time period data, the time period data comprise three-phase fundamental wave residual active electric energy, and the three-phase fundamental wave residual active electric energy is used for measuring the real electric fire risk of the loop in the window width of the window jump.

the measurement specifically refers to: and comparing the residual active electric energy of the three-phase fundamental wave with a preset threshold value, and judging that the loop has a real electrical fire risk when the residual active electric energy of the three-phase fundamental wave is higher than the preset threshold value.

4. The AC380V loop electric safety control method according to claim 3, wherein the period data in step S22 further includes an integral of | cosA |, | cosB |, | cosC | within the window width of the jump window, which is denoted as | cosA |, | cosB |, | Cosc |, and |, where | cosA |, | Cosb |, | Cosc | are used to determine that a phase with the greatest risk of the true electric fire occurs within the window width of the jump window, and specifically the phase with the greatest risk of the true electric fire occurring within the window width of the jump window is determined as: comparing the magnitudes of | cosA |, | cosB |, | cosC | and |,

if | cosA | > | cosB | > | cosC |, then it is determined that the phase with the greatest risk of occurrence of a true electrical fire within the window width of the jump window is not the C phase,

5. The method for electrical safety management and control of an AC380V loop of claim 1, wherein the real-time electrical signals in step S1 further include three-phase and neutral temperature signals, the real-time data in step S2 further include three-phase and neutral temperature real-time data, and the alarm event further includes an over-temperature of a phase a, B, C, or neutral of the loop.

6. The AC380V loop electric safety control method of claim 1,

the step S1 further includes uploading the real-time electrical signal to a cloud server; the step S21 further includes uploading the real-time data, the alarm event data, and the index group to the cloud server; the step S22 further includes uploading the time interval data to the cloud server;

the method further comprises the following steps:

7. The AC380V loop electric safety control method of claim 6, wherein in the step S3,

the cloud server is also used for carrying out unread continuous prompt, counting according to a preset time period and designing a full closed loop treatment process aiming at the alarm event data; the monitoring system is also used for automatically generating monitoring data reports available for downloading at regular intervals; the system is also used for generating an early warning event based on the time period data and the hidden danger analysis expert system, and carrying out display, unread continuous prompt, counting according to a preset time period and designing a full closed loop treatment process on the early warning event; and the intelligent recommendation function is also used for developing intelligent hidden danger diagnosis and hidden danger treatment method intelligent recommendation functions based on real-time data, alarm event data, time interval data and early warning event counting of the loop and the hidden danger analysis expert system.

8. An AC380V loop electric safety control system is characterized by comprising a monitoring terminal;

the monitoring terminal is used for collecting real-time electric signals of the monitored AC380V loop, calculating and generating real-time data, alarm event data and time period data according to the real-time electric signals, wherein the real-time electric signals comprise three-phase load current, three-phase load voltage and residual current signals,

the monitoring terminal comprises a mutual inductor group, an edge calculation module, an acousto-optic alarm module and a cloud communication module, wherein the mutual inductor group, the acousto-optic alarm module and the cloud communication module are respectively connected with the edge calculation module, the edge calculation module outputs a corresponding alarm instruction through the acousto-optic alarm module, the cloud communication module is used for receiving the real-time data, the alarm event data and the time interval data, transmitting the real-time data, the alarm event data and the time interval data to a cloud server, receiving the instruction sent by the cloud server and transmitting the instruction to the edge calculation module,

the transformer group comprises a load voltage transformer group, a load current transformer group and a residual current transformer, the transformer group is used for collecting the real-time electric signals,

the edge computing module comprises a signal conditioning circuit and a chip with an electric energy metering function, the signal conditioning circuit and the chip are connected with each other, the signal conditioning circuit is used for filtering the real-time electric signal and inputting the filtered real-time electric signal into the chip,

the chip is used for sampling the real-time data and calculating a sliding window effective value, the sliding scale of the sliding window is a preset time period, the chip continuously calculates the real-time electric signal to obtain the real-time data, simultaneously judges the real-time data every other sliding scale according to a preset threshold value group, generates the alarm event data in real time, the alarm event comprises overvoltage of an A phase or a B phase or a C phase, undervoltage of the A phase or the B phase or the C phase, overcurrent and electric leakage of the A phase or the B phase or the C phase in the loop, and outputs a corresponding real-time alarm instruction to the acousto-optic alarm module according to the type of the alarm event,

the chip comprises a module for calculating single-phase active power, generating three-phase fundamental active power, and combining the U_a、U_b、U_c、I_sGenerating the set of indicators for an electrical leakage alarm eventThe line selection is carried out corresponding to the fault point,

the chip is also used for sampling the real-time electric signal and calculating window jump time integral, the window width of the window jump is a preset time period, the chip calculates the real-time electric signal every preset time period to obtain real-time data, the time period data comprise three-phase fundamental wave residual active electric energy, and the three-phase fundamental wave residual active electric energy is used for measuring the real electric fire risk of the loop in the window width of the window jump.

the measurement specifically refers to: comparing the three-phase fundamental wave residual active electric energy with a preset threshold value, and judging that the loop has a real electrical fire risk when the three-phase fundamental wave residual active electric energy is higher than the preset threshold value;