CN102262200A - Portable power quality and fault recording integrated device - Google Patents
Portable power quality and fault recording integrated device Download PDFInfo
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- CN102262200A CN102262200A CN2010105749121A CN201010574912A CN102262200A CN 102262200 A CN102262200 A CN 102262200A CN 2010105749121 A CN2010105749121 A CN 2010105749121A CN 201010574912 A CN201010574912 A CN 201010574912A CN 102262200 A CN102262200 A CN 102262200A
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Abstract
The invention relates to the power supply technical field, in particular to a portable power quality and fault recording integrated device. The device comprises a chassis, a host power plug-in, an analysis computer plug-in, a liquid crystal display, a switch quantity acquisition plug-in, an analog quantity acquisition plug-in, an alternating current interface plug-in, a switch quantity interface, an alternating current interface, an analog to digital converter, a keyboard and a mouse. A data acquisition module, an analysis module, a display module, a parameter setting module and an inquiry module are arranged in the analysis computer plug-in. A real-time data acquisition module and a recording start module are arranged in the data acquisition module. An analog quantity display module and a switch quantity display module are arranged in the display module. The real-time data acquisition module is connected with the display module. The analysis module is a fault analysis module. The device disclosed by the invention has the advantages that: the device is small in volume and high in integrated level; simultaneously, the device has the functions of a power quantity monitoring device and a fault recording device; the purchasing installation cost is low; the device is operated simply and conveniently; and the display is clear.
Description
Technical field
The present invention relates to the power supply technique field, be specifically related to a kind of portable electric energy quality and failure wave-recording integrated apparatus.
Background technology
Economy will develop, and electric power must be in advance.Electric power becomes the basic assurance of economic development, timely analyzing and processing power failure, reduce power off time, just seem particularly important, electric energy quality monitoring and fault oscillograph provide the foundation of science for the electric system staff surveillance quality of power supply, analysis, processing electric power system fault.Along with developing rapidly of China's electric utility, technical progress emerges in an endless stream, electric system has entered the stage of big electrical network, high capacity, big unit, high voltage, high parameter, high automation, and electric energy quality monitoring and fault oscillograph just become the indispensable instrument of a kind of analysis electric network fault of generating plant, transformer station and large industrial enterprise.
Development along with Power Electronic Technique, direct current transportation, high-power single-phase rectifier technology are widely used on industrial sector and consumer, as the application on railway etc., cause current waveform distortion and three-phase imbalance serious day by day, become the key factor that influences the quality of power supply.They are very serious to the influence of the various power equipments of electric system, user and communication line.Simultaneously, impact power load such as electric arc furnaces will make line voltage fluctuate after dropping into operation of power networks, thereby seriously disturb the normal operation of fluctuate in the electrical network sensitive load such as illumination, computing machine, precision electronic device etc.When quick wave band takes place in the supply voltage of electric light source, houselights flicker be will cause, and then people's operate as normal and study influenced by the perception of human eye-brain chain, this process and phenomenon are referred to as voltage flicker.Voltage fluctuation not only makes houselights flicker, also can influence television picture quality, makes the motor speed pulsation, make electronic device work not normal etc.Electric system negative phase-sequence and harmonic wave and voltage flicker all are the key factors of weighing the quality of power supply, need to strengthen monitoring.
Fault oscillograph is that electric system is broken down and can self registering a kind of device when vibrating, it can write down system power, voltage and the derived quantity thereof that causes because of big disturbance such as short trouble, system oscillation, collapse of frequency, collapse of voltage, as the overall process variation phenomenon of meritorious, idle and system frequency.Be mainly used in the action behavior that detects relay protection and automatic safety device, the Changing Pattern of each electric parameter in the system in the understanding system transient state process, the correctness of check electric system calculation procedure and model parameter.For many years, failure wave-recording has become the important evidence of analytic system fault.
The number of channels that traditional equipment for monitoring power quality can be monitored is all fewer, generally is no more than 12 the tunnel, can not satisfy the request for utilization of medium and small sized substation, if passage to be monitored is a lot, many table apparatus can only be installed, and economy is very poor.Can only monitor in real time on the function, registering capacity is very poor, adopts the single-chip microcomputer design, is subjected to the storage medium capacity limit, can not write down the data of high sampling rate, big data quantity, need connect the measurement mutual inductor, wiring more complicated, function singleness.Traditional fault oscillograph generally is made up of analysis station and acquisition station two parts.Acquisition station is responsible for all input quantities are carried out data acquisition, calculating, in case satisfy entry condition, i.e. relevant data of record, and on give analysis station and make a concrete analysis of.Analysis station is responsible for each lot data that acquisition station is sent here is carried out fault analysis, analyzes concrete fault type and fault distance etc.But also there are some significant disadvantages in these traditional fault oscillographs, and at first, traditional fault oscillograph framework complexity relates to two equipment, and the cost height is installed also difficulty.Secondly, adopt Ethernet to carry out communication between analysis station and the acquisition station, and more or less can there be instability in communication in transmission course, ageing also relative mistake some.
Traditional equipment for monitoring power quality and traditional fault oscillograph all are the devices of simple function, the equipment for monitoring power quality special monitoring quality of power supply, and traditional fault oscillograph only carries out failure wave-recording when fault trip, (has abnormal occurrence to take place as electric current, voltage) after the monitoring quality of power supply has problem can't to start fault oscillograph to carry out failure wave-recording.
Summary of the invention
The purpose of this invention is to provide a kind of portable electric energy quality and failure wave-recording integrated apparatus, the electrical equipments such as transformer, circuit that are mainly used in the following different brackets senior middle school low-voltage power system of 110kV normally move and dynamically recording, the data analysis of the electric parameters when breaking down, possesses quality of power supply comprehensive monitoring function simultaneously, reproduce the electric parameters change procedure of fault and misoperation, as analyzing the electric power system fault reason, searching the main foundation of the trouble spot and the transmission line of electricity quality of power supply.
The objective of the invention is to be achieved through the following technical solutions.
Portable electric energy quality of the present invention and failure wave-recording integrated apparatus, it is characterized in that comprising cabinet, be located at the host power supply plug-in unit in this cabinet, the anacom plug-in unit that is connected of host power supply plug-in unit therewith respectively, LCD, the switch acquisition plug-in unit, the analog acquisition plug-in unit, exchange interface card, the switching value interface that is connected of switch acquisition plug-in unit therewith, the interchange interface that is connected of analog acquisition plug-in unit therewith, be located at the analog to digital converter in this analog acquisition plug-in unit, the keyboard that is connected of anacom plug-in unit therewith, mouse, described switch acquisition plug-in unit, LCD all therewith the anacom plug-in unit be connected
Described cabinet is 19 inches standard PC cases, adopt whole panel, the back of the body to insert the formula structure, whole panel is an one-piece construction, indicate the casing title, all modules of this cabinet are all installed behind case with card format, and all modules are all installed behind case with card format, are that core constitutes with the built-in industrial industrial computer, all alternating current-direct current interfaces, capture card and computing machine, power supply are all in same cabinet, improved reliability greatly, improved antijamming capability, made device compact more.
Be provided with data acquisition module, analysis module, display module, parameter in the described anacom plug-in unit module and enquiry module are set, this data acquisition module is connected with described analog to digital converter, switch acquisition plug-in unit,
Be provided with real-time data acquisition module, record ripple startup module in the described data acquisition module, be provided with analog quantity display module, switching value display module in the described display module, described real-time data acquisition module display module therewith is connected, described analysis module is a failure analysis module, described record ripple start module by to be analyzed batch therewith failure analysis module be connected.
When the electrical network quality of power supply went wrong or electric current, voltage jump take place, fault recording system was worked immediately, carried out squiggle demonstration, parameter analysis.
Described record ripple starts the sampled data that is input as a cycle of module and sampled data that should 8 cycles of week wavefront surface, be output as the particular type of startup: manually boot, start automatically, generate the record ripple file of every batch of startup, the initiating task state comprises No_task state, abc_seg state, d_seg state
1) the No_task state is no any store status, and do not need to store any data this moment, when new startup is arranged, changes the abc_seg state automatically over to,
2) the abc_seg state is the current abc segment data of storing,
3) the d_seg state is the current D segment data of storing.
The flow process that described record ripple starts the record ripple startup judgement of module is:
1) judge whether current state has store tasks,
2) judge that store tasks is arranged, carry out the storage recorder data,
3) judge no store tasks, or carry out the storage recorder data and finish whether just detect this cycle has the curtage sudden change, so that determine whether this cycle has startup,
4) detecting this cycle does not have startup, then returns the first step after updating task,
5) detecting this cycle has startup, has judged whether store tasks,
6) judge no store tasks, new lot is deposited preceding 8 cycle data and return the first step after updating task after starting generation,
7) judge that store tasks is arranged, then judge whether attitude into abc,
8) judge it is the abc attitude, then after updating task, return the first step,
9) judge it is not the abc attitude, then judge whether to be case1,
10) judge it is case1, then after updating task, return the first step,
11) judge it is not case1, then this batch has new startup, and deposit preceding 8 cycle data and after updating task, return the first step,
Case1: refer to that current startup is identical with the detected startup type of a last cycle and start type is the startup of out-of-limit class.
Described display module shows fault abridged table, fault waveform, and the real-time display simulation amount of described analog quantity display module comprises various display formats: instantaneous value, excellent figure, polar plot, curve map, the real-time display switch amount of described switching value state.
Described parameter is provided with module and comprises that bus bar configuration module, line configuring module, switch configuration module, frequency start-up parameter are provided with module, comprise voltage starting parameter, current start parameter, fault localization parameter in this bus bar configuration module, the line configuring module.
Described enquiry module comprises the inquiry of historical data module, historical warning message enquiry module, record ripple batch information enquiry module, this the inquiry of historical data module, historical warning message enquiry module back that is connected with input time, passage simultaneously shows poll-final, described record ripple batch information enquiry module with input time section, fault type show is connected after the demonstration poll-final.
Described analog acquisition plug-in unit is 32 road analog acquisition plug-in units, and the input signal of this analog acquisition plug-in unit is CT electric current, PT phase voltage, high-frequency signal, transceiver hf channel detection mouth signal or hf channel signal.
Gordian technique of the present invention and solution
1) data acquisition software stable and high effective operation on the MR32R real-time multi-task operating system.Solution is that the structure and the task scheduling mechanism of reply MR32R system is understood test in depth, rationally divide task module, it is distributed rational task priority, each task module is carried out DCO, avoid task deadlock and shared resource to use conflict, at last whole application program is carried out DCO, guarantee the total system stable and high effective operation.
2) electric energy quality monitoring software, the operation of fault analysis software multithreading, duty are freely changed, and are independent of each other, and total system is efficiently moved.Solution is that the structure and the task scheduling mechanism of reply WINDOWS operating system is understood test in depth, rationally divide task module, it is distributed rational task priority, each task module is carried out DCO, avoid task deadlock and shared resource to use conflict, at last whole application program is carried out DCO, guarantee the total system stable and high effective operation.
Software systems of the present invention mainly are divided into electric energy quality monitoring program and failure analysis program, write with VC6.0, the electric energy quality monitoring program is calculated and is shown effective value, aberration rate, 95% value, phase place, meritorious, idle, voltage deviation, degree of unbalancedness etc. greatly, routine analyzer reads real time data, carry out fault judgement then, check whether to satisfy entry condition, and calculate meritorious idle etc. being put on the main interface of main electrical parameter such as electric current and voltage for real-time demonstration; If satisfy entry condition, then enter exception handles, carry out data recording, the analysis of failure type, the deposit processing waits operation.And show and print fault waveform, fault data by simple mouse (or keyboard) operation.
In some middle and small transformer substations and industrial and mining enterprises, the power utilization environment very severe, various consumers are arranged, load variations is very fast, in order to keep the safety in production, to improve power supply quality and can in time analyzing the reason of electricity consumption line failure rapidly and monitor quality of power supply situation of change, in time take counter-measure.For needs surveillance equipment running status, carry out under the situation of electric energy quality monitoring simultaneously, should install equipment for monitoring power quality, for carrying out fault analysis after breaking down, search failure cause, analyzing nature of occurence, for producing and provide safely theoretical foundation, fault wave recording device need to be installed, how to be started fault oscillograph and carry out failure wave-recording and produce problem but can not solve electrical network generation electric current, voltage jump.Simultaneously again because reasons such as funds, place can not be installed centralized fault wave recording device and quality of power supply device, under this condition, portable electric energy quality and failure wave-recording integrated apparatus have been developed, have cost low, take up an area of little, easy-to-connect, multiple functional, not limited by the place, finishing using to be installed to other local use again, also can install by group screen simultaneously, uses as electric energy quality monitoring and centralized fault wave recording device.
Running software platform of the present invention is divided into 3 parts:
Routine analyzer-, operate in Windows 2000 Professional platforms with the VC6.0 programming;
Collecting unit program-use the C Programming with Pascal Language operates in the MR32R real-time multi-task operating system.Routine analyzer is uploaded communication protocol and is designed by the IEC60870-5-103 communication protocol.
Advantage of the present invention is:
1) device volume is little, the integrated level height;
2) has the function of equipment for monitoring power quality and two kinds of devices of failure wave-recording simultaneously; When this cycle of detection has the curtage sudden change, start failure wave-recording automatically;
3) the buying erected cost is low;
4) easy and simple to handle;
5) clear display.
Description of drawings
Fig. 1 is a hardware configuration synoptic diagram of the present invention.
Fig. 2 is a software pie graph of the present invention.
Fig. 3 is that software of the present invention concerns synoptic diagram.
Fig. 4 is that record ripple of the present invention starts the process flow diagram of judging.
Fig. 5 is the process flow diagram of enquiry module of the present invention.
Fig. 6 is provided with the process flow diagram of module for parameter of the present invention.
Fig. 7 is the process flow diagram of display module of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, portable electric energy quality of the present invention and failure wave-recording integrated apparatus, it is characterized in that comprising cabinet, be located at the host power supply plug-in unit in this cabinet, the anacom plug-in unit that is connected of host power supply plug-in unit therewith respectively, LCD, the switch acquisition plug-in unit, the analog acquisition plug-in unit, exchange interface card, the switching value interface that is connected of switch acquisition plug-in unit therewith, the interchange interface that is connected of analog acquisition plug-in unit therewith, be located at the analog to digital converter in this analog acquisition plug-in unit, the keyboard that is connected of anacom plug-in unit therewith, mouse, described switch acquisition plug-in unit, LCD all therewith the anacom plug-in unit be connected
Described cabinet is 19 inches standard PC cases, adopt whole panel, the back of the body to insert the formula structure, whole panel is an one-piece construction, indicate the casing title, all modules of this cabinet are all installed behind case with card format, and all modules are all installed behind case with card format, are that core constitutes with the built-in industrial industrial computer, all alternating current-direct current interfaces, capture card and computing machine, power supply are all in same cabinet, improved reliability greatly, improved antijamming capability, made device compact more.
As shown in Figure 2, be provided with data acquisition module, analysis module, display module, parameter in the described anacom plug-in unit module and enquiry module are set, this data acquisition module is connected with described analog to digital converter, switch acquisition plug-in unit.
As shown in Figure 3, be provided with real-time data acquisition module, record ripple startup module in the described data acquisition module, be provided with analog quantity display module, switching value display module in the described display module, described real-time data acquisition module display module therewith is connected, described analysis module is a failure analysis module, described record ripple start module by to be analyzed batch therewith failure analysis module be connected.
When the electrical network quality of power supply went wrong or electric current, voltage jump take place, fault recording system was worked immediately, carried out squiggle demonstration, parameter analysis.
As shown in Figure 4, described record ripple starts the sampled data that is input as a cycle of module and sampled data that should 8 cycles of week wavefront surface, be output as the particular type of startup: manually boot, start automatically, generate the record ripple file of every batch of startup, the initiating task state comprises No_task state, abc_seg state, d_seg state
1) the No_task state is no any store status, and do not need to store any data this moment, when new startup is arranged, changes the abc_seg state automatically over to,
2) the abc_seg state is the current abc segment data of storing,
3) the d_seg state is the current D segment data of storing.
The flow process that described record ripple starts the record ripple startup judgement of module is:
1) judge whether current state has store tasks,
2) judge that store tasks is arranged, carry out the storage recorder data,
3) judge no store tasks, or carry out the storage recorder data and finish whether just detect this cycle has the curtage sudden change, so that determine whether this cycle has startup,
4) detecting this cycle does not have startup, then returns the first step after updating task,
5) detecting this cycle has startup, has judged whether store tasks,
6) judge no store tasks, new lot is deposited preceding 8 cycle data and return the first step after updating task after starting generation,
7) judge that store tasks is arranged, then judge whether attitude into abc,
8) judge it is the abc attitude, then after updating task, return the first step,
9) judge it is not the abc attitude, then judge whether to be case1,
10) judge it is case1, then after updating task, return the first step,
11) judge it is not case1, then this batch has new startup, deposits preceding 8 cycle data and return the first step after updating task.
Case1: refer to that current startup is identical with the detected startup type of a last cycle and start type is the startup of out-of-limit class.
As shown in Figure 5, described display module shows fault abridged table, fault waveform, the real-time display simulation amount of described analog quantity display module comprises various display formats: instantaneous value, excellent figure, polar plot, curve map, the real-time display switch amount of described switching value state.
As shown in Figure 6, described parameter is provided with module and comprises that bus bar configuration module, line configuring module, switch configuration module, frequency start-up parameter are provided with module, comprise voltage starting parameter, current start parameter, fault localization parameter in this bus bar configuration module, the line configuring module.
As shown in Figure 7, described enquiry module comprises the inquiry of historical data module, historical warning message enquiry module, record ripple batch information enquiry module, this the inquiry of historical data module, historical warning message enquiry module back that is connected with input time, passage simultaneously shows poll-final, described record ripple batch information enquiry module with input time section, fault type show is connected after the demonstration poll-final.
Described analog acquisition plug-in unit is 32 road analog acquisition plug-in units, and the input signal of this analog acquisition plug-in unit is CT electric current, PT phase voltage, high-frequency signal, transceiver hf channel detection mouth signal or hf channel signal.
The key technical indexes of portable electric energy quality of the present invention and failure wave-recording integrated apparatus:
1) analog quantity input signal: 32 tunnel analog quantitys, can insert CT electric current, PT phase voltage, high-frequency signal (transceiver hf channel detection mouth signal or hf channel signal), voltage simultaneously can the measured frequency amount.
A) alternating current: 5A or 1A;
B) alternating voltage: 100/
V or 100V;
C) high-frequency signal (peak value): 0～10V;
2) switching value input signal: 48 road or 96 Lu Changkai or normally closed passive idle contact;
3) sampling index: a) sample mode: synchronized sampling; B) sample frequency: 5kHz;
4) measurement range and precision; A) alternating current: 0.1In～30In; B) alternating voltage: 0.1Un～2 Un;
C) DC voltage (high frequency): 50mV～10V; D) analog quantity channel survey frequency: 45Hz～55Hz;
5) starting accuracy of measurement: a) the out-of-limit type of the single electric weight of the working value absolute value that plays momentum (voltage, electric current etc.) average error should be not more than 5%; B) the single electric weight saltant of the working value absolute value that plays momentum (voltage, electric current etc.) average error should be not more than 20%;
6) measuring accuracy: a) electric current, voltage: ± 0.5%; B) active power, reactive power: ± 2%; C) frequency: ± 0.01Hz;
7) distance accuracy: the metallic short circuit error is less than 3%.
Following table shows the quality of power supply and failure wave-recording software major function.
Claims (8)
1. portable electric energy quality and failure wave-recording integrated apparatus, it is characterized in that comprising cabinet, be located at the host power supply plug-in unit in this cabinet, the anacom plug-in unit that is connected of host power supply plug-in unit therewith respectively, LCD, the switch acquisition plug-in unit, the analog acquisition plug-in unit, exchange interface card, the switching value interface that is connected of switch acquisition plug-in unit therewith, the interchange interface that is connected of analog acquisition plug-in unit therewith, be located at the analog to digital converter in this analog acquisition plug-in unit, the keyboard that is connected of anacom plug-in unit therewith, mouse, described switch acquisition plug-in unit, LCD all therewith the anacom plug-in unit be connected
Described cabinet is 19 inches standard PC cases, adopts whole panel, the back of the body to insert the formula structure, and whole panel is an one-piece construction, indicates the casing title, and all modules of this cabinet are all installed behind case with card format,
Be provided with data acquisition module, analysis module, display module, parameter in the described anacom plug-in unit module and enquiry module are set, this data acquisition module is connected with described analog to digital converter, switch acquisition plug-in unit,
Be provided with real-time data acquisition module, record ripple startup module in the described data acquisition module, be provided with analog quantity display module, switching value display module in the described display module, described real-time data acquisition module display module therewith is connected, described analysis module is a failure analysis module, described record ripple start module by to be analyzed batch therewith failure analysis module be connected.
2. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that when the electrical network quality of power supply goes wrong or electric current, voltage jump take place, described fault recording system is worked immediately, carries out squiggle demonstration, parameter analysis.
3. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that described record ripple starts the sampled data that is input as a cycle of module and sampled data that should 8 cycles of week wavefront surface, be output as the particular type of startup: manually boot, start automatically, generate the record ripple file of every batch of startup, the initiating task state comprises No_task state, abc_seg state, d_seg state
1) the No_task state is no any store status, and do not need to store any data this moment, when new startup is arranged, changes the abc_seg state automatically over to,
2) the abc_seg state is the current abc segment data of storing,
3) the d_seg state is the current D segment data of storing.
4. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus is characterized in that the flow process of the record ripple startup judgement of described record ripple startup module is:
1) judge whether current state has store tasks,
2) judge that store tasks is arranged, carry out the storage recorder data,
3) judge no store tasks, or carry out the storage recorder data and finish whether just detect this cycle has the curtage sudden change, so that determine whether this cycle has startup,
4) detecting this cycle does not have startup, then returns the first step after updating task,
5) detecting this cycle has startup, has judged whether store tasks,
6) judge no store tasks, new lot is deposited preceding 8 cycle data and return the first step after updating task after starting generation,
7) judge that store tasks is arranged, then judge whether attitude into abc,
8) judge it is the abc attitude, then after updating task, return the first step,
9) judge it is not the abc attitude, then judge whether to be case1,
10) judge it is case1, then after updating task, return the first step,
11) judge it is not case1, then this batch has new startup, and deposit preceding 8 cycle data and after updating task, return the first step,
Case1: refer to that current startup is identical with the detected startup type of a last cycle and start type is the startup of out-of-limit class.
5. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that described display module shows fault abridged table, fault waveform, the real-time display simulation amount of described analog quantity display module, comprise various display formats: instantaneous value, excellent figure, polar plot, curve map, the real-time display switch amount of described switching value state.
6. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that described parameter is provided with module and comprises that bus bar configuration module, line configuring module, switch configuration module, frequency start-up parameter are provided with module, comprise voltage starting parameter, current start parameter, fault localization parameter in this bus bar configuration module, the line configuring module.
7. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that described enquiry module comprises the inquiry of historical data module, historical warning message enquiry module, record ripple batch information enquiry module, this the inquiry of historical data module, historical warning message enquiry module back that is connected with input time, passage simultaneously shows poll-final, described record ripple batch information enquiry module with input time section, fault type show is connected after the demonstration poll-final.
8. portable electric energy quality according to claim 1 and failure wave-recording integrated apparatus, it is characterized in that described analog acquisition plug-in unit is 32 road analog acquisition plug-in units, the input signal of this analog acquisition plug-in unit is CT electric current, PT phase voltage, high-frequency signal, transceiver hf channel detection mouth signal or hf channel signal.
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| CN102928716A (en) * | 2012-11-06 | 2013-02-13 | 江苏正佰电气股份有限公司 | Intelligent power quality monitoring system |
| CN103163426A (en) * | 2013-02-25 | 2013-06-19 | 武汉中元华电科技股份有限公司 | Fault recorder utilizing travelling wave fault location algorithm |
| CN103269129A (en) * | 2013-05-30 | 2013-08-28 | 国家电网公司 | Electric energy monitoring data optimizing device and optimizing method thereof |
| CN103869196A (en) * | 2014-03-28 | 2014-06-18 | 北京同控电力系统技术有限公司 | Electricity quantity recording analyzer |
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| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
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