CN112072784B - Power distribution cabinet arc light monitoring and early warning device and monitoring and early warning method thereof - Google Patents

Power distribution cabinet arc light monitoring and early warning device and monitoring and early warning method thereof Download PDF

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CN112072784B
CN112072784B CN202010747131.1A CN202010747131A CN112072784B CN 112072784 B CN112072784 B CN 112072784B CN 202010747131 A CN202010747131 A CN 202010747131A CN 112072784 B CN112072784 B CN 112072784B
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arc
module
early warning
intensity
current
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CN112072784A (en
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赵杰
肖海涛
宋莉
周智鹏
董继民
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Shanghai Red Sandalwood Intelligent Technology Co ltd
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Shanghai Red Sandalwood Intelligent Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/40—Display of information, e.g. of data or controls

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire Alarms (AREA)

Abstract

The invention relates to a switch board electric arc light monitoring and early warning device and a monitoring and early warning method thereof, wherein a voltage and each branch current mutual inductor measuring module, each branch arc light sensor measuring module, each branch intelligent fire extinguishing material integrated patch fire extinguishing module are arranged in a switch board, a CPU comprehensive analysis module, an early warning judging module, a fire control output module and a remote background display operation module are arranged, the voltage, each branch current and each branch arc light intensity are monitored, calculated and judged in real time, estimation calculation is carried out on the arc light intensity according to the real-time monitoring value and the variable quantity of the arc light intensity, secondary excess judgment and early warning are carried out, a linked fire control module judging and starting method with a certain operating current is adopted for the excess of the arc light intensity of three adjacent branches and the excess of the duration, and the fire control module can be started point to point in time when the arc light occurs, eliminating hidden troubles and ensuring that the good branch can continue to operate.

Description

Power distribution cabinet arc light monitoring and early warning device and monitoring and early warning method thereof
Technical Field
The invention relates to the technical field of safety monitoring of power equipment, in particular to a power distribution cabinet arc light monitoring and early warning device and a monitoring and early warning method thereof, wherein a fire-fighting module can be started point to point in time when arc light occurs, hidden dangers are eliminated, and a good branch can continue to operate.
Background
At present, the arc light monitoring and protection device of switch board generally installs several arc light intensity sensor in the switch board and whether have the arc light to take place in the check switch board, when the discovery has the arc light intensity excess value, whether the total inlet wire electric current that combines the switch board is the excess value and carries out tripping operation protection, when the two all satisfies the condition, sends and trips total inlet wire circuit breaker, and whole switch board loses electricity. The monitoring does not consider the development process of arc light, only takes an instantaneous value as a basis, and the current during linkage still needs to exceed a fixed value, so that if the total current does not exceed the value, arc drawing is continuously carried out in the breaking process of the branch circuit breaker or arc drawing of grounding current occurs, the judgment cannot be met at the same time, the arc fault is enlarged, even if the incoming line breaker is tripped clearly through timely diagnosis, the whole power distribution cabinet is powered off, redundant branches which operate well are cut off, and even if the arc fault occurs, the protection action is only to trip the incoming line breaker, the operating current is cut off, such as arc burning, or fire-fighting remedial measures cannot be carried out timely.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a power distribution cabinet arc light monitoring and early warning device and a monitoring and early warning method thereof for realizing omnibearing point-to-point voltage and current detection, arc light intensity estimation early warning, protection and fire control arc extinction.
The technical scheme of the invention is realized as follows:
an electric arc light monitoring and early warning device of a power distribution cabinet comprises a power distribution cabinet shell, a voltage and current transformer measuring module arranged in a main incoming line loop in the power distribution cabinet shell, a current transformer measuring module arranged in each branch loop in the power distribution cabinet shell, an arc light sensor measuring module arranged in the main incoming line loop and each branch in the power distribution cabinet shell, an intelligent fire extinguishing material integrated patch fire fighting module arranged at different positions in the power distribution cabinet shell, and a measurement and control unit case arranged in the power distribution cabinet shell, wherein a computer hardware mainboard and a storage module, a designed and embedded software analysis module, a hardware module analog quantity interface and a switching quantity interface are arranged in the measurement and control unit case, the hardware module analog quantity interface and the switching quantity interface are respectively connected with the voltage and current transformer measuring module, the arc light sensor measuring module and the intelligent fire extinguishing material integrated patch fire fighting module through different data lines and receive data of the voltage and current transformer measuring module, the arc light sensor measuring module and the intelligent fire extinguishing material integrated patch fire fighting module, then enters a software analysis module embedded in a case of the measurement and control unit, the software analysis module comprises a CPU comprehensive analysis module, an early warning judgment module, a fire control output module and a remote background display operation module, the CPU comprehensive analysis module analyzes, calculates and stores sampled voltage, current and arc light data, then sends the calculated data to the early warning judgment module, the early warning judgment module respectively judges whether the voltage, the current and the arc light are excessive, if the voltage, the current and the arc light are excessive, the early warning module enters the fire control output module, the fire control output module is protected and starts fire control after confirmation, a control instruction is sent out by a computer, then a peripheral switch is started through a switching value channel, the running warning information and the switching value action state can be seen in a display screen of the remote background display operation module, the remote background display operation module is an operation keyboard and a display, and the computer hardware mainboard is connected with the computer hardware mainboard in the measurement and control unit case.
After receiving information of starting fire control of the fire control output module, a group of intelligent fire extinguishing material integrated patch fire control modules arranged at different positions in the power distribution cabinet immediately start corresponding intelligent fire extinguishing material integrated patches through switching on and switching off; the intelligent fire extinguishing material integrated patch consists of an intelligent fire extinguishing agent and a base material, wherein the intelligent fire extinguishing agent is a solid chemical mixture and consists of an oxidant, a reducing agent and an auxiliary agent, a large amount of fire extinguishing gas can be rapidly generated, the fire extinguishing substance contains ammonia gas, carbon dioxide and fire extinguishing floating micro-particles, and the intelligent fire extinguishing material integrated patch rapidly realizes fine-point fire extinguishing through physical and chemical inhibition effects to achieve the effects of fire extinguishing and fighting.
A monitoring and early warning method of a power distribution cabinet arc light monitoring and early warning device comprises the following steps:
step 1), initializing a program, respectively setting input sampling data or output parameter addresses of a current transformer measuring module, an arc light sensor measuring module, an early warning judging module, a fire fighting output module and a remote background display operation module, and setting early warning and fire fighting starting threshold values, historical data query records and communication modes;
step 2), monitoring and storing the operating voltage and current;
respectively reading real-time measured values of the voltage and current transformer measuring modules, and completing the calculation and storage of the voltage and current of the total loop and the current effective value of the current of each output branch;
step 3), arc light monitoring and storing
Respectively reading the real-time measured value of each arc sensor, finishing the calculation and storage of the current running value of each arc sensor, considering the influence of the arc change increment, and calculating the ith comprehensive estimation value of the arc intensity of the mth arc sensor as follows:
HGTmi＝Tmi+α(Tmi-Tmi-1) (1)
Tmifor the ith measurement of the m arc sensor, Tmi-1The measured value alpha of the ith-1 time of the mth arc sensor is an arc positive increment calculation coefficient, and alpha is zero when the arc positive increment is negative;
step 4), judging and early warning of excessive arc light intensity
The arc intensity over-value early warning judgment expression of the mth arc sensor is as follows:
HGTmi≥km1Tm1D (2)
HGTmi≥km2Tm2D t≥tR2D (3)
in the formula: HGTmiFor the m-th arc sensor arc intensity integrated estimate, Tm1DFirst order arc intensity constant, k, allowed for the integrated estimation of the arc sensorm1A reliable coefficient is taken for the first-stage arc light intensity fixed value of the mth arc light sensor, and when the value exceeds the fixed value, the warning is immediately given, and Tm2DFor second-stage arc intensity, tm2DFor a time constant allowed to exceed the threshold, km2The reliability coefficient of the value of the second-stage arc intensity fixed value of the mth arc sensor is used for sending out an early warning signal corresponding to a decision formula when the early warning decision meets the decision formula;
step 5), voltage and current excess value judgment and early warning
When the operating voltage is greater than the overvoltage fixed value, the overvoltage is judged, when the operating voltage is lower than the low voltage fixed value, the low voltage is judged, and the current judgment formula of each branch circuit is as follows: when the running current is larger than a first-stage quick-break current fixed value, judging that the running current exceeds a second-stage overcurrent fixed value, judging that the running current exceeds an overcurrent fixed value when the running current lasts for a certain time, and sending a corresponding excess early warning signal when the judgment formula is established;
step 6), the fire-fighting module is linked to judge and start
When judging when having arc light early warning signal, during the entering fire control output module, for the reliability of guaranteeing to start intelligent integrated paster fire control module of fire extinguishing material, reach quick early warning, reliable export, at fire control output module, will judge and start the integrated paster fire control module of mth intelligent fire extinguishing material, then the arc light intensity of mth arc light sensor surpasses the value early warning and judges that expression and adjacent criterion formula must satisfy the excess simultaneously and judge, and the excess lasts certain time limit in succession, and this return circuit is certain at the running state, operating current is not less than 50% of rated current, can express as:
Figure BDA0002608760090000041
wherein t is the intensity simultaneous over-value duration of the (m-1, m, m + 1) th arc sensor, tmmaxStarting a fire-fighting output module for the m measuring points to obtain a maximum allowable duration fixed value, arranging the arc sensors according to a closed-loop sequence, and naturally forming a front sequence and a rear sequence ImFor m actual operating currents, ImNM paths of rated current; after the m fire-fighting output modules are started, the fire-fighting output modules of other paths are started, and the current constraint conditions are removed according to the starting criteria, so that the fire-fighting output modules can be started positively when the non-operating current branch meets the conditions in the arc light arcing process;
step 7), historical storage and record storage of data;
all the state quantities and data quantities of the memories of the calculation and early warning, fire protection starting and standard exceeding marks are stored in the memory initially set by a program for historical record and query;
step 8), returning the program on line;
after the steps are completed, the program returns to the online setting position on line to carry out the next calculation and judgment, and the cycle is repeated, so that the monitoring, calculation, judgment, early warning and fire fighting processing tasks of the electric arc light monitoring and early warning device of the power distribution cabinet are formed
The invention has the positive effects that: the method for judging and starting the linkage arc light fire-fighting module is provided, wherein the arc light intensity is estimated and calculated according to the real-time monitoring value and the variable quantity of the arc light intensity, secondary excess judgment and early warning are carried out, the excess of the arc light intensity of three adjacent branches and the excess of the duration are adopted, and the linkage arc light fire-fighting module has certain running current, so that the point-to-point timely starting of the fire-fighting module can be ensured when arc light occurs, the hidden danger is eliminated, and good branches can continue to run.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present invention.
FIG. 2 is a schematic flow diagram of the present invention.
Detailed Description
As shown in figures 1 and 2, an electric arc light monitoring and early warning device for a power distribution cabinet comprises a power distribution cabinet shell, a voltage and current transformer measuring module arranged in a main incoming line loop in the power distribution cabinet shell, a current transformer measuring module arranged in each branch loop in the power distribution cabinet shell, an arc light sensor measuring module arranged in the main incoming line loop and each branch in the power distribution cabinet shell, intelligent fire extinguishing material integrated patch fire extinguishing modules arranged at different positions in the power distribution cabinet shell, a measurement and control unit case arranged in the power distribution cabinet shell, a computer hardware mainboard and a storage module arranged in the measurement and control unit case, a software analysis module designed to be embedded, a hardware module analog quantity interface and a switching quantity interface, wherein the hardware module analog quantity interface and the switching quantity interface are respectively connected with the voltage and current transformer measuring module, the arc light sensor measuring module and the switching quantity interface through different data lines, The intelligent fire extinguishing material integrated patch fire fighting module is connected with and receives data of the intelligent fire extinguishing material integrated patch fire fighting module, and then enters a software analysis module embedded in a case of the measurement and control unit, wherein the software analysis module comprises a CPU comprehensive analysis module, an early warning judgment module, a fire fighting output module and a remote background display operation module, the CPU comprehensive analysis module analyzes, calculates and stores sampled voltage, current and arc light data, then sends the calculated data to the early warning judgment module, the early warning judgment module respectively judges whether the voltage, the current and the arc light exceed values, if the voltage, the current and the arc light exceed values, the intelligent fire extinguishing material integrated patch fire fighting module starts early warning and enters a fire fighting output module after the fire fighting output module confirms, a control instruction is sent out through a computer, then the intelligent fire extinguishing material integrated patch fire fighting module is connected through a switching value channel, a peripheral switch is started, and running warning information and switching value action states can be seen in a display screen of the remote background display operation module, the remote background display operation module is an operation keyboard and a display and is connected with a computer hardware mainboard in the case of the measurement and control unit;
after receiving information of starting fire control of the fire control output module, a group of intelligent fire extinguishing material integrated patch fire control modules arranged at different positions in the power distribution cabinet immediately start corresponding intelligent fire extinguishing material integrated patches through switching on and switching off; the intelligent fire extinguishing material integrated patch consists of intelligent fire extinguishing agents and a base material, specific components can refer to the intelligent fire extinguishing patch in the invention patent application with the application number of 201910477017.9, and the intelligent fire extinguishing material integrated patch can rapidly generate a large amount of fire extinguishing gas, rapidly realize fine ignition fire extinguishing and achieve the fire extinguishing effect.
A monitoring and early warning method of a power distribution cabinet arc light monitoring and early warning device comprises the following steps:
step 1), initializing a program, respectively setting input sampling data or output parameter addresses of a current transformer measuring module, an arc light sensor measuring module, an early warning judging module, a fire fighting output module and a remote background display operation module, and setting early warning and fire fighting starting threshold values, historical data query records and communication modes;
step 2), monitoring and storing the operating voltage and current;
respectively reading real-time measured values of the voltage and current transformer measuring modules, and completing the calculation and storage of the voltage and current of the total loop and the current effective value of the current of each output branch;
step 3), arc light monitoring and storing
Respectively reading the real-time measured value of each arc sensor, finishing the calculation and storage of the current running value of each arc sensor, considering the influence of the arc change increment, and calculating the ith comprehensive estimation value of the arc intensity of the mth arc sensor as follows:
HGTmi＝Tmi+α(Tmi-Tmi-1) (1)
Tmifor the ith measurement of the m arc sensor, Tmi-1The measured value alpha of the ith-1 time of the mth arc sensor is an arc positive increment calculation coefficient, and alpha is zero when the arc positive increment is negative;
step 4), judging and early warning of excessive arc light intensity
The arc intensity over-value early warning judgment expression of the mth arc sensor is as follows:
HGTmi≥km1Tm1D (2)
HGTmi≥km2Tm2D t≥tR2D (3)
in the formula: HGTmiFor the m-th arc sensor arc intensity integrated estimate, Tm1DFirst order arc intensity constant, k, allowed for the integrated estimation of the arc sensorm1A reliable coefficient is taken for the first-stage arc light intensity fixed value of the mth arc light sensor, and when the value exceeds the fixed value, the warning is immediately given, and Tm2DFor second-stage arc intensity, tm2DFor a time constant allowed to exceed the threshold, km2The reliability coefficient of the value of the second-stage arc intensity fixed value of the mth arc sensor is used for sending out an early warning signal corresponding to a decision formula when the early warning decision meets the decision formula;
step 5), voltage and current excess value judgment and early warning
When the operating voltage is greater than the overvoltage fixed value, the overvoltage is judged, when the operating voltage is lower than the low voltage fixed value, the low voltage is judged, and the current judgment formula of each branch circuit is as follows: when the running current is larger than the first-stage quick-break current fixed value, judging that the running current exceeds a second-stage overcurrent fixed value, and when the running current exceeds a second-stage overcurrent fixed value and the duration time is up, judging that the overcurrent exceeds the value, and sending a corresponding excess early warning signal when the judgment formula is established;
step 6), the fire-fighting module is linked to judge and start
When judging when having arc light early warning signal, when getting into fire control output module, for the reliability of guaranteeing to start intelligent integrated paster fire control module of fire extinguishing material, reach quick early warning, reliable export, at fire control output module, judge to start the integrated paster fire control module of mth intelligent fire extinguishing material, then the arc light intensity of mth arc light sensor exceedance early warning judgement expression and adjacent criterion formula must satisfy the excess simultaneously and judge, and the excess lasts certain time limit in succession, and this return circuit is certain in the running state, operating current is not less than 50% of rated current, can express as:
Figure BDA0002608760090000081
wherein t is the intensity simultaneous over-value duration of the (m-1, m, m + 1) th arc sensor, tmmaxStarting a fire-fighting output module for the m measuring points to obtain a maximum allowable duration fixed value, arranging the arc sensors according to a closed-loop sequence, and naturally forming a front sequence and a rear sequence ImFor m actual operating currents, ImNM paths of rated current; after the m paths of fire-fighting output modules are started, the fire-fighting output modules of other paths are started according to the criterion to remove the current constraint condition, so that the fire-fighting output modules can be actively started when the non-operating current branch meets the condition in the arc light arcing process;
step 7), historical storage and record storage of data;
all the state quantities and data quantities of the memories of the calculation and early warning, fire protection starting and standard exceeding marks are stored in the memory initially set by a program for historical record and query;
step 8), returning the program on line;
after the steps are completed, the program returns to the online setting position on line to carry out the next calculation and judgment, and the monitoring, calculation, judgment, early warning and fire fighting processing tasks of the power distribution cabinet arc light monitoring and early warning device are formed in a circulating manner.

Claims (3)

1. The utility model provides a switch board electric arc light monitoring early warning device which characterized in that: comprises a power distribution cabinet shell, a voltage and current transformer measuring module arranged in a main incoming line loop in the power distribution cabinet shell, a current transformer measuring module arranged in each branch loop in the power distribution cabinet shell, an arc light sensor measuring module arranged in the main incoming line loop and each branch in the power distribution cabinet shell, an intelligent fire extinguishing material integrated patch fire fighting module arranged at different positions in the power distribution cabinet shell, and a measurement and control unit case arranged in the power distribution cabinet shell, wherein a computer hardware mainboard and a storage module, a design embedded software analysis module, a hardware module analog quantity interface and a switching quantity interface are arranged in the measurement and control unit case, the hardware module analog quantity interface and the switching quantity interface are respectively connected with the voltage and current transformer measuring module, the arc light sensor measuring module and the intelligent fire extinguishing material integrated patch fire fighting module through different data lines and receive the data of the voltage and current transformer measuring module, the arc light sensor measuring module and the intelligent fire extinguishing material integrated patch fire fighting module, then enters a software analysis module embedded in a case of the measurement and control unit, the software analysis module comprises a CPU comprehensive analysis module, an early warning judgment module, a fire control output module and a remote background display operation module, the CPU comprehensive analysis module analyzes, calculates and stores sampled voltage, current and arc light data, then sends the calculated data to the early warning judgment module, the early warning judgment module respectively judges whether the voltage, the current and the arc light are excessive, if the voltage, the current and the arc light are excessive, the early warning module enters the fire control output module, the fire control output module is protected and starts fire control after confirmation, a control instruction is sent out by a computer, then a peripheral switch is started through a switching value channel, the running warning information and the switching value action state can be seen in a display screen of the remote background display operation module, the remote background display operation module is an operation keyboard and a display, the computer hardware mainboard is connected with the computer hardware mainboard in the measurement and control unit case;
the monitoring and early warning method of the power distribution cabinet arc light monitoring and early warning device comprises the following steps:
step 1), initializing a program, respectively setting input sampling data or output parameter addresses of a current transformer measuring module, an arc light sensor measuring module, an early warning judging module, a fire fighting output module and a remote background display operation module, and setting early warning and fire fighting starting threshold values, historical data query records and communication modes;
step 2), monitoring and storing the operating voltage and current;
respectively reading real-time measured values of the voltage and current transformer measuring modules, and completing the calculation and storage of the voltage and current of the total loop and the current effective value of the current of each output branch;
step 3), arc light monitoring and storing
Respectively reading the real-time measured value of each arc sensor, finishing the calculation and storage of the current running value of each arc sensor, considering the influence of the arc change increment, and calculating the comprehensive estimated value of the ith arc intensity of the mth arc sensor as:
HGTmi＝Tmi+α(Tmi-Tmi-1) (1)
Tmifor the ith measurement of the m arc sensor, Tmi-1For the i-1 th measurement of the m-th arc sensor
Alpha is the calculation coefficient of the positive increment of the arc light, and alpha is zero when the increment is negative;
step 4), judging and early warning of excessive arc light intensity
The arc intensity over-value early warning judgment expression of the mth arc sensor is as follows:
HGTmi≥km1Tm1D (2)
HGTmi≥km2Tm2D t≥tm2D (3)
in the formula: HGTmiFor the m-th arc sensor arc intensity integrated estimate, Tm1DThe first-stage arc intensity constant value, k, allowed for the m-th arc sensor arc intensity integrated estimation valuem1The reliability coefficient of the first-level arc intensity fixed value of the mth arc sensor arc intensity comprehensive estimation value is judged, and when the reliability coefficient exceeds the fixed value, the alarm is immediately given, and Tm2DFor second-stage arc intensity, tm2DK is a time constant allowed for exceeding the second stage arc intensity constant thresholdm2The reliability coefficient of the value of the second-stage arc intensity fixed value of the mth arc sensor is used for sending out an early warning signal corresponding to a decision formula when the early warning decision meets the decision formula;
step 5), voltage and current excess value judgment and early warning
When the operating voltage is greater than the overvoltage fixed value, the overvoltage is judged, when the operating voltage is lower than the low voltage fixed value, the low voltage is judged, and the current judgment formula of each branch circuit is as follows: when the running current is larger than a first-stage quick-break current fixed value, judging that the running current exceeds a second-stage overcurrent fixed value, judging that the running current exceeds an overcurrent fixed value when the running current lasts for a certain time, and sending a corresponding excess early warning signal when the judgment formula is established;
step 6), the fire-fighting module is linked to judge and start
When judging when having arc light early warning signal, when getting into the fire control output module, for the reliability of guaranteeing to start intelligent integrated paster fire control module of fire extinguishing material, reach quick early warning, reliable export, at fire control output module, will judge and start the integrated paster fire control module of mth intelligent fire extinguishing material, then the arc light intensity of mth arc light sensor surpasses the value early warning and judges expression and adjacent criterion formula must satisfy the excess simultaneously and judge, and the excess lasts certain time limit in succession, and this mth return circuit is certain at the running state, the operating current is not less than 50% of rated current, can express as:
Figure FDA0003649083060000031
the judging formula carries out measurement, estimation, calculation and judgment on the intensity of the arc sensor of each branch, starting from a first branch, recording as m when an mth branch is carried out, recording a branch which is carried out before the mth branch as an m-1 branch, and recording a branch which is carried out after the mth branch as an m +1 branch;
HGTmifor the m-th arc sensor arc intensity integrated estimate, Tm1DFirst order arc intensity constant, k, allowed for the mth arc sensor arc intensity integrated estimatem1A reliability coefficient for the first-level arc intensity fixed value of the mth arc sensor arc intensity comprehensive estimation value;
HGT(m+1)ifor the (m + 1) th arc sensor arc intensity integrated estimate, T(m+1)1DFirst order arc intensity constant, k, allowed for the m +1 th arc sensor arc intensity integrated estimate(m+1)1A reliability coefficient for the first-stage arc intensity fixed value of the (m + 1) th arc sensor arc intensity comprehensive estimation value;
HGT(m-1)ifor the m-1 th arc sensor arc intensity integrated estimation value, T(m-1)1DFirst order arc intensity constant, k, allowed for m-1 arc sensor arc intensity integrated estimate(m-1)1A reliability coefficient for the first-level arc intensity fixed value of the (m-1) th arc sensor arc intensity comprehensive estimation value;
wherein t is the recorded m-1 th, m-1 th and m +1 th arc sensor arc intensity comprehensive estimation value simultaneous excessive duration time, tmmaxStarting a fire-fighting output module to obtain a maximum allowable duration fixed value which is larger than a fixed value for the m-th arc sensor to measure the signal arc intensity comprehensive estimation value, starting the fire-fighting output module, arranging the arc sensors according to a closed-loop sequence, and naturally forming a front-back sequence ImFor m branch of actual operating current, ImNRated current for the m branch; after the m-branch fire-fighting output module is started, the fire-fighting output modules of other branches are started according to the starting criterion to remove the current constraint condition, so that the fire-fighting output module can be actively started when the non-operating current branch meets the condition in the arc light arcing process;
step 7), historical storage and record storage of data;
all the state quantities and data quantities of the memories of the calculation and early warning, fire protection starting and standard exceeding marks are stored in the memory initially set by a program for historical record and query;
step 8), returning the program on line;
after the steps are completed, the program returns to the online setting position on line to carry out the next calculation and judgment, and the monitoring, calculation, judgment, early warning and fire fighting processing tasks of the power distribution cabinet arc light monitoring and early warning device are formed in a circulating manner.
2. The power distribution cabinet arc light monitoring and early warning device of claim 1, wherein: after receiving information of starting fire control of the fire control output module, a group of intelligent fire extinguishing material integrated patch fire control modules arranged at different positions in the power distribution cabinet immediately start corresponding intelligent fire extinguishing material integrated patches through switching on and switching off; the intelligent fire extinguishing material integrated patch consists of an intelligent fire extinguishing agent and a base material, wherein the intelligent fire extinguishing agent is a solid chemical mixture and consists of an oxidant, a reducing agent and an auxiliary agent, a large amount of fire extinguishing gas can be rapidly generated, the fire extinguishing substance contains ammonia gas, carbon dioxide and fire extinguishing floating micro-particles, and the intelligent fire extinguishing material integrated patch rapidly realizes fine-point fire extinguishing through physical and chemical inhibition effects to achieve the effects of fire extinguishing and fighting.
3. A monitoring and early warning method of a power distribution cabinet arc light monitoring and early warning device is characterized by comprising the following steps:
step 1), initializing a program, respectively setting input sampling data or output parameter addresses of a current transformer measuring module, an arc light sensor measuring module, an early warning judging module, a fire fighting output module and a remote background display operation module, and setting early warning and fire fighting starting threshold values, historical data query records and communication modes;
step 2), monitoring and storing the operating voltage and current;
respectively reading real-time measured values of the voltage and current transformer measuring modules, and completing the calculation and storage of the voltage and current of the total loop and the current effective value of the current of each output branch;
step 3), arc light monitoring and storing
Respectively reading the real-time measured value of each arc sensor, finishing the calculation and storage of the current running value of each arc sensor, considering the influence of the arc change increment, and calculating the ith comprehensive estimation value of the arc intensity of the mth arc sensor as follows:
HGTmi＝Tmi+α(Tmi-Tmi-1) (1)
Tmifor the ith measurement of the m arc sensor, Tmi-1The (i-1) th measurement value alpha of the mth arc sensor is an arc positive increment calculation coefficient, and alpha is zero when the arc positive increment is negative;
step 4), judging and early warning of excessive arc light intensity
The arc intensity over-value early warning judgment expression of the mth arc sensor is as follows:
HGTmi≥km1Tm1D (2)
HGTmi≥km2Tm2D t≥tm2D (3)
in the formula: HGTmiFor the m-th arc sensor arc intensity integrated estimate, Tm1DFirst order arc intensity constant, k, allowed for the mth arc sensor arc intensity integrated estimatem1The reliability coefficient of the first-level arc intensity fixed value of the mth arc sensor arc intensity comprehensive estimation value is judged, and when the reliability coefficient exceeds the fixed value, the alarm is immediately given, and Tm2DFor second-stage arc intensity, tm2DK is a time constant allowed for exceeding the second stage arc intensity constant thresholdm2The reliability coefficient of the value of the second-stage arc intensity fixed value of the mth arc sensor is used for sending out an early warning signal corresponding to a decision formula when the early warning decision meets the decision formula;
step 5), voltage and current excess value judgment and early warning
When the operating voltage is greater than the overvoltage fixed value, the overvoltage is judged, when the operating voltage is lower than the low voltage fixed value, the low voltage is judged, and the current judgment formula of each branch circuit is as follows: when the running current is larger than a first-stage quick-break current fixed value, judging that the running current exceeds a second-stage overcurrent fixed value, judging that the running current exceeds an overcurrent fixed value when the running current lasts for a certain time, and sending a corresponding excess early warning signal when the judgment formula is established;
step 6), the fire fighting module is linked to judge and start
When judging when having arc light early warning signal, when getting into the fire control output module, for the reliability of guaranteeing to start intelligent integrated paster fire control module of fire extinguishing material, reach quick early warning, reliable export, at fire control output module, will judge and start the integrated paster fire control module of mth intelligent fire extinguishing material, then the arc light intensity of mth arc light sensor surpasses the value early warning and judges expression and adjacent criterion formula must satisfy the excess simultaneously and judge, and the excess lasts certain time limit in succession, and this mth return circuit is certain at the running state, the operating current is not less than 50% of rated current, can express as:
Figure FDA0003649083060000061
the judging formula carries out measurement, estimation, calculation and judgment on the intensity of the arc sensor of each branch, starting from a first branch, recording as m when an mth branch is carried out, recording a branch which is carried out before the mth branch as an m-1 branch, and recording a branch which is carried out after the mth branch as an m +1 branch;
HGTmifor the m-th arc sensor arc intensity integrated estimate, Tm1DFirst order arc intensity constant, k, allowed for the mth arc sensor arc intensity integrated estimatem1A reliability coefficient for the first-level arc intensity fixed value of the mth arc sensor arc intensity comprehensive estimation value;
HGT(m+1)ifor the (m + 1) th arc sensor arc intensity integrated estimate, T(m+1)1DFirst order arc intensity constant, k, allowed for the m +1 th arc sensor arc intensity integrated estimate(m+1)1A reliability coefficient for the first-stage arc intensity fixed value of the (m + 1) th arc sensor arc intensity comprehensive estimation value;
HGT(m-1)ifor the m-1 th arc sensor arc intensity integrated estimation value, T(m-1)1DFirst order arc intensity constant, k, allowed for m-1 arc sensor arc intensity integrated estimate(m-1)1A reliability coefficient for the first-level arc intensity fixed value of the (m-1) th arc sensor arc intensity comprehensive estimation value;
wherein t is the recorded m-1 th, m-1 th and m +1 th arc sensor arc intensity comprehensive estimation value simultaneous excessive duration time, tmmaxStarting a fire control output module to a maximum allowable duration fixed value which is larger than a fixed value for the mth arc sensor to measure the signal arc intensity comprehensive estimation value, starting the fire control output module, arranging the arc sensors according to a closed loop sequence, and naturally forming a front sequence and a back sequence, ImFor m branch of actual operating current, ImNRated current for the m branch; after the m-branch fire-fighting output module is started, the fire-fighting output modules of other branches are started according to the criterion to remove the current constraint condition, so that the non-operating current branch can be accumulated when the condition is met in the arc light arcing processThe fire-fighting output module is started;
step 7), historical storage and record storage of data;
all the state quantities and data quantities of the memories of the calculation and early warning, fire protection starting and standard exceeding marks are stored in the memory initially set by a program for historical record and query;
step 8), returning the program on line;
after the steps are completed, the program returns to the online setting position on line to carry out the next calculation and judgment, and the monitoring, calculation, judgment, early warning and fire fighting processing tasks of the power distribution cabinet arc light monitoring and early warning device are formed in a circulating manner.
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