CN115173562A - Intelligent monitoring and protecting method and system for electric power instrument - Google Patents

Intelligent monitoring and protecting method and system for electric power instrument Download PDF

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Publication number
CN115173562A
CN115173562A CN202210899226.4A CN202210899226A CN115173562A CN 115173562 A CN115173562 A CN 115173562A CN 202210899226 A CN202210899226 A CN 202210899226A CN 115173562 A CN115173562 A CN 115173562A
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voltage
protection
current
overcurrent
power
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张继征
盛以良
陈子栋
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Tysen Kld Group Co ltd
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Tysen Kld Group 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
    • 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]
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/0012—Contingency detection
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/00125—Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to an intelligent monitoring and protecting method of an electric power instrument, which comprises the following steps: the method comprises the following steps that a plurality of power supply voltage and current electric appliance parameter acquisition sensors acquire current, voltage, active power and reactive power data of each circuit of electric equipment, and the data are uploaded to a special metering chip after digital-to-analog conversion; the special metering chip calculates various voltage and current and power related parameters of the electric equipment according to the acquired data and uploads the parameters to the data analysis module; the data analysis module carries out-of-limit judgment on the collected signals, and if the signals are out of limit, an out-of-limit event is generated and directly sent to the main control module; and the main control module generates a corresponding protection strategy according to the acquired out-of-limit information, generates an evaluation report of the operating condition and stores the evaluation report. The method and the system have the advantages of real-time monitoring, perfect protection strategy and high power supply safety.

Description

Intelligent monitoring and protecting method and system for electric power instrument
Technical Field
The invention relates to the field of power equipment, in particular to an intelligent monitoring and protecting method and system for a power instrument.
Background
In recent years, with the continuous expansion of the scale of the power grid, the number of power equipment is increasing, and more power monitoring information needs to be acquired. The traditional electric power monitoring means usually requires technicians to go to the site to record electric power parameters of each monitoring point according to an ammeter or other instruments, so that the efficiency is low, manpower is wasted, the data updating period is long, real-time monitoring is difficult to achieve, and the increasingly expanded electric power monitoring requirements are difficult to meet by adopting the traditional electric power monitoring means.
The data acquisition terminal is installed through at the electric power instrument at present, carries out instant monitoring to various electric quantity signals and environmental signal in the electric power instrument circuit to through public wireless internet with data centralized storage centralized analysis. However, the technical scheme is still single in function of the power instrument, and the function is not comprehensive in metering, so that various on-site measurement requirements cannot be met; and is not comprehensive enough in protection strategy, and does not realize long-term monitoring results to provide valuable suggestions for customers.
Disclosure of Invention
The invention aims to provide an intelligent monitoring and protecting method and system for a power instrument, which have the advantages of real-time monitoring, complete protection strategy and high power supply safety.
In order to achieve the purpose, the technical scheme adopted by the invention is an intelligent monitoring and protecting method of an electric power meter, which comprises the following steps of
A plurality of power supply voltage and current electric appliance parameter acquisition sensors at the field measurement and control end acquire current, voltage, active power and reactive power data of each circuit of the electric equipment, and the data are uploaded to a special metering chip after digital-to-analog conversion;
the special metering chip calculates various voltage and current and power related parameters of the electric equipment according to the acquired various data and uploads the parameters to the data analysis module;
the data analysis module of the site measurement and control terminal carries out-of-limit judgment on the collected signals, and if the signals are out of limit, out-of-limit events are generated and directly sent to the main control module;
the main control module generates a corresponding protection strategy according to the out-of-limit information sent by the stored remote control terminal, generates an evaluation report of the operation condition at the same time, stores the evaluation report and uploads the evaluation report to the remote control terminal in real time.
Further, the voltage, current and power related parameters of the electric equipment include voltage, current, power factor, frequency, fundamental voltage, fundamental current, power and current demand, extreme value statistics, reverse sequence detection and no-voltage detection parameters.
The main control module generates corresponding protection strategies according to the acquired out-of-limit information, wherein the protection strategies comprise a line protection strategy, a capacitor protection strategy, a spare power automatic switching and subsection protection strategy, a transformer main protection strategy, a transformer backup protection strategy, a low-voltage transformer protection strategy, a motor comprehensive protection strategy and PT protection.
Wherein the protection policy comprises
When any phase current reaches an overcurrent setting value, after a settable delay time Tset, performing protection action;
when any phase current is greater than the overload protection setting value, after a settable delay time Tset, performing protection action;
when any voltage exceeds a voltage fixed value, after a settable delay time Tset, performing protection action;
when the device monitors abnormal conditions, after a settable delay time Tset, protecting actions; the abnormal conditions comprise motor reverse power, motor step-out, overlong motor starting time, unbalanced voltage and current and zero-sequence gap overcurrent.
Further, the line protection comprises overcurrent first-stage protection, overcurrent second-stage protection, timing-limited overcurrent third-stage protection and inverse-limited overcurrent third-stage protection; the protection options in the line protection are direction locking and zero sequence direction locking.
In an improved technical scheme, the method further comprises the step of
The sensors collect temperature, humidity, noise and vibration signals of the environment of the instrument, and the signals are subjected to digital-to-analog conversion and then uploaded for data analysis, so that whether corresponding signal values are out of limit or not is judged.
In a further improved aspect, the method further comprises
The main control module generates a corresponding protection strategy according to the acquired out-of-limit information and simultaneously issues alarm information to related users in a data issuing mode; the data issuing mode comprises a short message party sending mode, an electronic mail sending mode and a webpage issuing mode.
Further, the evaluation report of the operating condition includes
The electric energy measurement report comprises the total active power degree, the net active power degree parameter, the forward active power degree and the reverse active power degree in the unit time, and is stored and displayed on a display screen; when the accumulated electric energy exceeds a preset value, automatically resetting;
the harmonic analysis report comprises a histogram of three-phase voltage, total distortion rate of current, 2-51 harmonics and the content rate of each subharmonic of each voltage and current; and
and the waveform drawing report comprises processing the three-way voltage and current waveform data of the power grid and drawing a waveform diagram with corresponding parameters.
The second aspect of the invention discloses an intelligent monitoring and protecting system applying the method, which comprises
The parameter acquisition module is configured to acquire current, voltage, active power and reactive power data of each circuit of the electric equipment through a plurality of power supply voltage and current electric appliance parameter acquisition sensors; the system also comprises a plurality of sensors for collecting temperature, humidity, noise and vibration signals of the environment of the instrument, and uploading the signals after digital-to-analog conversion;
the special metering module is configured to obtain various data and calculate various voltage and current and power related parameters of the electric equipment; the voltage, current and power related parameters of the electric equipment comprise voltage, current, power factor, frequency, fundamental wave voltage, fundamental wave current, power and current demand, extreme value statistics, reverse sequence detection and voltage loss detection parameters;
the data analysis module is configured to judge the out-of-limit of the collected signals, and if the signals are out of limit, an out-of-limit event is generated and directly sent to the main control module;
the main control module is used for generating a corresponding protection strategy according to the acquired out-of-limit information and executing the corresponding strategy through the switching value output circuit;
and the evaluation reporting module is configured to generate an evaluation report of the operating condition according to the out-of-limit information.
The system further comprises an alarm module, a data issuing module and a data processing module, wherein the alarm module is configured to issue alarm information to relevant users in a data issuing mode while generating corresponding protection strategies according to the acquired out-of-limit information; the data issuing mode comprises a short message party sending mode, an electronic mail sending mode and a webpage issuing mode.
The monitoring and protecting method of the invention monitors the input power supply, the analog power supply and the digital power supply of the device in real time by the high-precision measurement and frequency tracking technology of the electric power data, and ensures the running reliability of the device by matching with a perfect online self-monitoring program. The accuracy of alarm judgment and prediction is improved through a microcomputer relay protection strategy and a switch state indicating device, the working efficiency of operation and maintenance personnel is improved, and the safety level of power system equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of an intelligent monitoring and protection method for an electric power meter;
fig. 2 is a schematic structural diagram of an intelligent monitoring and protecting method system of an electric power meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The following describes embodiments of the intelligent power meter and the power system thereof for remote data acquisition and control according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the intelligent monitoring and protecting method of the electric power meter comprises
A plurality of power supply voltage and current electrical appliance parameter acquisition sensors at the site measurement and control end acquire current, voltage, active power and reactive power data of each circuit of the electric equipment, and the data are uploaded to a special metering chip after digital-to-analog conversion;
the special metering chip calculates various voltage and current and power related parameters of the electric equipment according to the acquired various data and uploads the parameters to the data analysis module;
the data analysis module of the site measurement and control terminal carries out-of-limit judgment on the collected signals, and if the signals are out of limit, out-of-limit events are generated and directly sent to the main control module;
the main control module generates a corresponding protection strategy according to the out-of-limit information sent by the stored remote control terminal, generates an evaluation report of the operation condition at the same time, stores the evaluation report and uploads the evaluation report to the remote control terminal in real time.
The voltage, current and power related parameters of the electric equipment comprise voltage, current, power factor, frequency, fundamental voltage, fundamental current, power and current demand, extreme value statistics, reverse sequence detection and voltage loss detection parameters.
In a specific example, the main control module generates corresponding protection strategies according to the acquired out-of-limit information, wherein the protection strategies include a line protection strategy, a capacitor protection strategy, a backup power automatic switching and segmentation protection strategy, a transformer main protection strategy, a transformer backup protection strategy, a low-voltage transformer protection strategy, a motor comprehensive protection strategy and PT protection.
The protection strategy comprises
When any phase current reaches an overcurrent set setting value, after a settable delay time Tset, performing protection action;
when any phase current is greater than the overload protection setting value, after a settable delay time Tset, performing protection action;
when any voltage exceeds a voltage fixed value, after a settable delay time Tset, performing protection action;
when the device monitors abnormal conditions, the device protects actions after a settable delay time Tset; the abnormal conditions comprise motor reverse power, motor step-out, overlong motor starting time, unbalanced voltage and current and zero-sequence gap overcurrent.
The line protection comprises overcurrent first-stage protection, overcurrent second-stage protection, timing-limited overcurrent third-stage protection and inverse-limited overcurrent third-stage protection;
the action conditions of the overcurrent one-stage protection are as follows: putting overcurrent first-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked, the negative sequence voltage is greater than a set negative voltage locking overcurrent fixed value 3Uset; the delay exceeds a set time fixed value Tset;
the overcurrent two-stage protection has the following operating conditions: putting into overcurrent two-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked, the negative sequence voltage is greater than a set negative voltage locking overcurrent fixed value 3Uset; if the overcurrent is input in the two-stage direction, the direction condition is met; any phase current is greater than the set current custom Iset; the delay exceeds a set time fixed value Tset;
the overcurrent three-stage protection has the following action conditions: putting into overcurrent three-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked and put into use, the negative sequence voltage is larger than a set negative voltage locking overcurrent fixed value 3Uset; if the three-stage direction of overcurrent is input, the direction condition is met; any phase current is larger than the set current custom Iset; the delay exceeds a set time fixed value Tset;
the action conditions of the inverse time limit overcurrent three-stage protection are as follows: three-stage protection input of inverse time limit overcurrent; starting when the current is more than 1.1 times of Iset; the delay time is greater than the calculated value of the characteristic curve; wherein the characteristic curve comprises:
extreme inverse time limit:
Figure BDA0003770331170000071
very inverse time-limited:
Figure BDA0003770331170000072
general inverse time limit:
Figure BDA0003770331170000073
wherein, t: the action time is in seconds;
i: a fault current;
uset: starting a voltage set value;
iset: starting a current set value;
tset: multiplying the time by the set value of the silver seed, and setting the range to be 0.05-4.00.
The protection options in the corresponding line protection are direction locking and zero sequence direction locking;
the direction locking is specifically as follows: when the line voltages are all smaller than 3V, the voltage is the memory voltage before the fault; when the PT is disconnected, the directional element is withdrawn, so that the current protection is realized in a non-directional manner;
the zero sequence direction locking specifically comprises the following steps: when the feeder line normally operates, the zero sequence current leads the zero sequence voltage by 90 degrees because of distributed capacitance between the line and the ground, and the direction of the zero sequence current is a bus flow direction line; when a single-phase earth fault occurs on a feeder line, the zero-sequence current at the initial end of the line is the sum of zero-sequence capacitance currents of non-fault phases of the whole power grid, and the direction of the zero-sequence capacitance current is that the line points to a bus.
In another example, the evaluation report of the operating condition includes
The electric energy measurement report comprises the total active power degree, the net active power degree parameter, the forward active power degree and the reverse active power degree in the unit time, and is stored and displayed on a display screen; when the accumulated electric energy exceeds a preset value, automatically resetting;
the harmonic analysis report comprises a histogram of three-phase voltage, total distortion rate of current, 2-51 harmonics and the content rate of each subharmonic of each voltage and current; and
and the waveform drawing report comprises a waveform chart of corresponding parameters obtained by processing the three-way voltage and current waveform data of the power grid.
In another example, the method further comprises
A plurality of sensors acquire temperature, humidity, noise and vibration signals of the environment of the instrument, and the signals are uploaded for data analysis after digital-to-analog conversion, so that whether the corresponding signal values are out of limit or not is judged.
In yet another example, the method further comprises
The main control module generates a corresponding protection strategy according to the acquired out-of-limit information and simultaneously issues alarm information to related users in a data issuing mode; the data issuing mode comprises a short message party sending mode, an electronic mail sending mode and a webpage issuing mode.
The second aspect of the present invention provides an intelligent monitoring and protection system using the above method, as shown in fig. 2, including
The parameter acquisition module is configured to acquire current, voltage, active power and reactive power data of each circuit of the electric equipment through a plurality of power supply voltage and current electric appliance parameter acquisition sensors; the sensors collect temperature, humidity, noise and vibration signals of the environment of the instrument, and upload the signals after digital-to-analog conversion;
the special metering module is configured to obtain various data and calculate various voltage and current and power related parameters of the electric equipment; the voltage, current and power related parameters of the electric equipment comprise voltage, current, power factor, frequency, fundamental wave voltage, fundamental wave current, power and current demand, extreme value statistics, reverse sequence detection and voltage loss detection parameters;
the data analysis module is configured to carry out-of-limit judgment on the collected signals, and if the signals are out of limit, an out-of-limit event is generated and directly sent to the main control module;
the main control module is used for generating a corresponding protection strategy according to the acquired out-of-limit information and executing the corresponding strategy through the switching value output circuit;
the evaluation reporting module is configured to generate an evaluation report of the operation condition according to the out-of-limit information;
the alarm module is configured to generate a corresponding protection strategy according to the acquired out-of-limit information and issue alarm information to related users in a data issuing mode; the data issuing mode comprises a short message party sending mode, an electronic mail sending mode and a webpage issuing mode.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of terminal devices (systems) and computer program products according to embodiments of the invention. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the block diagram block or blocks.
Furthermore, it should be noted that, in this document, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only which elements but also other elements not explicitly listed, or further includes inherent elements of such process, method, article or apparatus.
The preferred embodiments and examples of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments and examples described above, and various changes can be made within the knowledge of those skilled in the art without departing from the concept of the present invention.

Claims (10)

1. An intelligent monitoring and protecting method for an electric power instrument is characterized by comprising the following steps
A plurality of power supply voltage and current electrical appliance parameter acquisition sensors at the site measurement and control end acquire current, voltage, active power and reactive power data of each circuit of the electric equipment, and the data are uploaded to a special metering chip after digital-to-analog conversion;
the special metering chip calculates various voltage and current and power related parameters of the electric equipment according to the acquired various data and uploads the parameters to the data analysis module;
the data analysis module of the site measurement and control terminal judges the out-of-limit of the collected signals, and if the out-of-limit is exceeded, an out-of-limit event is generated and directly sent to the main control module;
the main control module generates a corresponding protection strategy according to the out-of-limit information sent by the stored remote control terminal, generates an evaluation report of the operation condition at the same time, stores the evaluation report and uploads the evaluation report to the remote control terminal in real time.
2. The intelligent monitoring and protection method of electric power meter according to claim 1, wherein the voltage and current and power related parameters of the electric equipment include voltage, current, power factor, frequency, fundamental voltage, fundamental current, power and current demand, extreme value statistics, inverse sequence detection, and voltage loss detection parameters;
the main control module generates corresponding protection strategies according to the acquired out-of-limit information, wherein the protection strategies comprise a line protection strategy, a capacitor protection strategy, a spare power automatic switching and subsection protection strategy, a transformer main protection strategy, a transformer backup protection strategy, a low-voltage transformer protection strategy, a motor comprehensive protection strategy and PT protection.
3. The intelligent monitoring and protection method of an electric power meter according to claim 2, characterized in that the protection strategy comprises
When any phase current reaches an overcurrent setting value, after a settable delay time Tset, performing protection action;
when any phase current is greater than the overload protection setting value, after a settable delay time Tset, performing protection action;
when any voltage exceeds a voltage fixed value, after a settable delay time Tset, performing protection action;
when the device monitors abnormal conditions, after a settable delay time Tset, protecting actions; the abnormal conditions comprise motor reverse power, motor step-out, overlong motor starting time, unbalanced voltage and current and zero-sequence gap overcurrent.
4. The intelligent monitoring and protection method of an electric power meter according to claim 2, wherein the line protection comprises overcurrent first-stage protection, overcurrent second-stage protection, timer-limited overcurrent third-stage protection and inverse-limited overcurrent third-stage protection;
the action conditions of the overcurrent one-stage protection are as follows: putting into overcurrent first-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked, the negative sequence voltage is greater than a set negative voltage locking overcurrent fixed value 3Uset; the delay exceeds a set time fixed value Tset;
the overcurrent two-stage protection has the following operating conditions: putting into overcurrent two-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked, the negative sequence voltage is greater than a set negative voltage locking overcurrent fixed value 3Uset; if the overcurrent is input in the two-stage direction, the direction condition is met; any phase current is larger than the set current custom Iset; the delay exceeds a set time fixed value Tset;
the overcurrent three-stage protection has the following action conditions: putting into overcurrent three-stage protection; if the low voltage is locked, any line voltage is smaller than a set low voltage fixed value Uset; if the negative sequence voltage is locked, the negative sequence voltage is greater than a set negative voltage locking overcurrent fixed value 3Uset; if the three-stage direction input is performed, the direction condition is met; any phase current is greater than the set current custom Iset; the delay exceeds a set time fixed value Tset;
the action conditions of the inverse time limit overcurrent three-stage protection are as follows: inverse time limit overcurrent three-stage protection input; starting when the current is more than 1.1 times of Iset; the delay time is greater than the calculated value of the characteristic curve; wherein the characteristic curve comprises:
extreme inverse time limit:
Figure FDA0003770331160000031
very inverse time-limited:
Figure FDA0003770331160000032
general inverse time limit:
Figure FDA0003770331160000033
wherein, t: the action time is in seconds;
i: a fault current;
iset: starting a current set value;
tset: multiplying the time by the set value of the silver seed, and setting the range to be 0.05-4.00.
5. The intelligent monitoring and protection method of an electric power meter according to claim 1, wherein the protection options in the line protection are directional blocking and zero sequence directional blocking.
6. The intelligent monitoring and protection method of an electric power meter according to claim 1, characterized in that said method further comprises
The acquisition sensor is also provided with sensors for acquiring temperature, humidity, noise and vibration signals of the environment of the instrument.
7. The intelligent monitoring and protection method of an electric power meter according to claim 1, characterized in that the method further comprises
The main control module generates a corresponding protection strategy according to the acquired out-of-limit information and simultaneously issues alarm information to related users in a data issuing mode; the data issuing mode comprises a short message party sending mode, an electronic mail sending mode and a webpage issuing mode.
8. The intelligent monitoring and protection method of an electric power meter according to claim 1, wherein the evaluation report of the operation condition includes
The electric energy measurement report comprises the total active power degree, the net active power degree parameter, the forward active power degree and the reverse active power degree in the unit time, and is stored and displayed on a display screen; when the accumulated electric energy exceeds a preset value, automatically resetting;
the harmonic analysis report comprises a histogram of three-phase voltage, total distortion rate of current, 2-51 harmonics and the content rate of each subharmonic of each voltage and current; and
and the waveform drawing report comprises a waveform chart of corresponding parameters obtained by processing the three-way voltage and current waveform data of the power grid.
9. An intelligent monitoring and protection system applying the method of any one of claims 1 to 7, comprising
The parameter acquisition module is configured to acquire current, voltage, active power and reactive power data of each circuit of the electric equipment through a plurality of power supply voltage and current electric appliance parameter acquisition sensors; the system also comprises a plurality of sensors for acquiring temperature, humidity, noise and vibration signals of the environment of the instrument, and uploading the signals after digital-to-analog conversion;
the special metering module is configured to obtain various data and calculate various voltage and current and power related parameters of the electric equipment; the voltage, current and power related parameters of the electric equipment comprise voltage, current, power factor, frequency, fundamental wave voltage, fundamental wave current, power and current demand, extreme value statistics, reverse sequence detection and voltage loss detection parameters;
the data analysis module is configured to judge the out-of-limit of the collected signals, and if the signals are out of limit, an out-of-limit event is generated and directly sent to the main control module;
the main control module is used for generating a corresponding protection strategy according to the acquired out-of-limit information and executing the corresponding strategy through the switching value output circuit;
and the evaluation report module is configured to generate an evaluation report of the operating condition according to the out-of-limit information.
10. The intelligent monitoring and protection system of claim 9, further comprising an alert module configured to issue alert information to relevant users in a data issuing manner while generating corresponding protection policies according to the obtained out-of-limit information; the data issuing mode comprises a short message party sending mode, an e-mail sending mode and a webpage issuing mode.
CN202210899226.4A 2022-07-28 2022-07-28 Intelligent monitoring and protecting method and system for electric power instrument Pending CN115173562A (en)

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