CN112542889A - Three-phase load unbalance monitoring system - Google Patents
Three-phase load unbalance monitoring system Download PDFInfo
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- CN112542889A CN112542889A CN202011433385.2A CN202011433385A CN112542889A CN 112542889 A CN112542889 A CN 112542889A CN 202011433385 A CN202011433385 A CN 202011433385A CN 112542889 A CN112542889 A CN 112542889A
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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
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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
- H02J13/00001—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]
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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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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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 a three-phase load unbalance monitoring system which is structurally characterized in that a distribution area current acquisition and transmission module samples a neutral current signal, then the acquired signal is amplified, filtered, subjected to analog-to-digital conversion and subjected to discrete sampling point calculation, and test data is transmitted to a management area Internet of things data recording unit after the ratio is calculated; the management station area Internet of things data recording unit receives transformer current information corresponding to the management station area, records the current information, generates a trend graph, and sends a short message or a micro message to a station area manager mobile phone terminal when the alarm value is exceeded according to a set alarm value; the PC side server takes a management area as a unit, each test point of the transformer of the area to which the PC side server belongs consists of a cloud server to form a network, and a neutral current change database of each transformer of the area is established; and the PC end servers in each area are connected in a networking manner, and data summarization of all monitoring data and report generation are performed. The invention has simple operation, high efficiency and safety.
Description
Technical Field
The invention relates to a three-phase load unbalance monitoring system, and belongs to the field of electric power application.
Background
The low-voltage distribution network (380V) mostly adopts a TN system to operate, neutral point drift can be caused due to three-phase load unbalance or single-phase earth fault and the like, and at the moment, a large current can flow in a neutral line and sometimes can reach hundreds of amperes. When the neutral line has a displacement voltage, the three-phase voltages are unbalanced, so that a certain phase voltage is higher than the maximum allowable voltage of the equipment and a certain phase voltage is lower than the minimum allowable voltage of the equipment, and the equipment cannot normally operate. In addition, when the central line is disconnected, the electrical equipment of the user is damaged, so that claim disputes are easy to occur between the user and a power supply department.
Disclosure of Invention
The invention provides a three-phase load unbalance monitoring system aiming at the problems in the prior art, and solves the problem of equipment failure caused by abnormal operation of a neutral line in the prior art.
The technical scheme of the invention is as follows:
a three-phase load unbalance monitoring system comprises a power distribution area current acquisition and transmission module, a management area Internet of things data recording unit and a PC (personal computer) end server, wherein the power distribution area current acquisition and transmission module is used for sampling a neutral current signal, then carrying out amplification, filtering, analog-to-digital conversion and discrete sampling point calculation on the acquired signal, and transmitting test data to the management area Internet of things data recording unit after calculating the ratio; the management station area Internet of things data recording unit receives transformer current information corresponding to the management station area, records the current information, generates a trend graph, and sends a short message or a micro message to a station area manager mobile phone terminal when the alarm value is exceeded according to a set alarm value; the PC side server takes a management area as a unit, each test point of the transformer of the area to which the PC side server belongs consists of a cloud server to form a network, and a neutral current change database of each transformer of the area is established; and the PC end servers in each area are connected in a networking manner, and data summarization of all monitoring data and report generation are performed.
The power distribution station area current acquisition and transmission module comprises an open-close type current transformer, a 220V power supply and measurement conversion module and an Internet of things communication module, and the open-close type current transformer, the 220V power supply and measurement conversion module and the Internet of things communication module are in wireless connection; the open-close type current transformer is clamped on a neutral line to sample neutral line current signals, the range of the open-close type current transformer is 100A or 200A, the open-close type current transformer transmits the collected neutral line current signals to the 220V power supply and measurement conversion module, the 220V power supply and measurement conversion module performs amplification, filtering and analog-to-digital conversion on the signals to calculate discrete sampling points, and test data are transmitted to the Internet of things data recording unit of the management area through the Internet of things communication module after the occupation ratio is calculated.
When the PC side server needs to monitor the sampling data of a certain test point in real time, the instruction is sent to the corresponding monitoring equipment through the cloud server, and the monitoring equipment receives the instruction and returns the real-time data to the PC side server.
When the PC end server prompts that the neutral current is 0, the management background automatically or manually operates a switch on the remote control standby zero line to close so as to start the standby zero line.
The mobile phone terminal of the station management personnel can check real-time data of all transformer neutral current, review historical data and installation places of the transformers in the management station area at any time.
The PC terminal server names the installed power distribution area current acquisition and transmission module, and the name comprises information such as a test range, an alarm threshold, an installation place position, an equipment number account and the like; and simultaneously, setting a contact telephone and a management authority of a station transformer attribution manager, and establishing station transformer basic information data and a normal value, an alarm value and an abnormal value of the neutral current in a background database of the PC.
The invention has the following advantages and effects:
the method comprises the steps of utilizing an open-close type current transformer (Rogowski coil principle) to carry out whole-process monitoring on the neutral current of a single transformer in a station area, setting an alarm threshold of the neutral current of the transformer according to the capacity of the transformer, namely, regularly transmitting the neutral current of the single transformer in the managed station area to a management background for recording, summarizing and generating a time current change trend graph, reading the current in real time by the background, setting an alarm according to the maximum allowable value of the neutral current of the operating transformer, applying for accessing data to a national power grid data center, directly transmitting the data to a mobile phone terminal of a station area manager by a national power grid data platform in a short message or micro message mode, and adjusting and processing accident potential hazards such as three-phase imbalance and the like. And transmitting the monitoring data to a server terminal by each management station area unit, recording the neutral line current of the transformer of the full-range distribution station area, and generating a summary report. The method comprises the following specific steps:
1. the normal operation of the equipment is ensured, and the equipment fault caused by the abnormal operation of the neutral line is avoided.
2. High sensitivity, accuracy, reliability and correct alarm.
3. Disputes caused by equipment damage of users and power supply enterprises are reduced.
4. The patrol time of the low-voltage transformer area is shortened, and the labor input is reduced.
5. When the device is mounted and dismounted, the transformer does not need to be powered off, a power supply is arranged in the device, the occupied area is small, and the device can be moved to other transformer neutral wires needing to be tested at any time and any place.
6. The current situation of the neutral line of the transformer can be collected in real time and is wirelessly transmitted to a management background to be recorded, summarized and a time current change trend graph is generated.
7. And setting an early warning value, sending early warning information to operation and maintenance personnel in time, making active prejudgment and eliminating hidden dangers in advance.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention.
FIG. 2 is a schematic flow chart of the present invention.
Detailed Description
Examples
A three-phase load unbalance monitoring system comprises a power distribution area current acquisition and transmission module, a management area Internet of things data recording unit and a PC (personal computer) end server, wherein the power distribution area current acquisition and transmission module is used for sampling a neutral current signal, then carrying out amplification, filtering, analog-to-digital conversion and discrete sampling point calculation on the acquired signal, and transmitting test data to the management area Internet of things data recording unit after calculating the ratio; the management station area Internet of things data recording unit receives transformer current information corresponding to the management station area, records the current information, generates a trend graph, and sends a short message or a micro message to a station area manager mobile phone terminal when the alarm value is exceeded according to a set alarm value; the PC side server takes a management area as a unit, each test point of the transformer of the area to which the PC side server belongs consists of a cloud server to form a network, and a neutral current change database of each transformer of the area is established; and the PC end servers in each area are connected in a networking manner, and data summarization of all monitoring data and report generation are performed.
The power distribution station area current acquisition and transmission module comprises an open-close type current transformer, a 220V power supply and measurement conversion module and an Internet of things communication module, and the open-close type current transformer, the 220V power supply and measurement conversion module and the Internet of things communication module are in wireless connection; the open-close type current transformer is clamped on a neutral line to sample neutral line current signals, the range of the open-close type current transformer is 100A or 200A, the open-close type current transformer transmits the collected neutral line current signals to the 220V power supply and measurement conversion module, the 220V power supply and measurement conversion module performs amplification, filtering and analog-to-digital conversion on the signals to calculate discrete sampling points, and test data are transmitted to the Internet of things data recording unit of the management area through the Internet of things communication module after the occupation ratio is calculated.
When the PC side server needs to monitor the sampling data of a certain test point in real time, the instruction is sent to the corresponding monitoring equipment through the cloud server, and the monitoring equipment receives the instruction and returns the real-time data to the PC side server.
When the PC end server prompts that the neutral current is 0, the management background automatically or manually operates a switch on the remote control standby zero line to close so as to start the standby zero line.
The mobile phone terminal of the station management personnel can check real-time data of all transformer neutral current, review historical data and installation places of the transformers in the management station area at any time.
The PC terminal server names the installed power distribution area current acquisition and transmission module, and the name comprises information such as a test range, an alarm threshold, an installation place position, an equipment number account and the like; and simultaneously, setting a contact telephone and a management authority of a station transformer attribution manager, and establishing station transformer basic information data and a normal value, an alarm value and an abnormal value of the neutral current in a background database of the PC.
The invention specifically passes through the following steps on a transformer neutral line of a No. 3 box transformer substation carried by a No. 1 ring main unit of a residential quarter in east of a certain city:
the community activities are held by the common people activity center of the 25-3 building carried by the 6 o ' clock box transformer station No. 3 at night, nearby residents catch up, the power supply of the activity center is supplied by the phase A of the 3 o ' clock box transformer station, then the residents carried by the two phases BC of the 3 o ' clock transformer station are caused to participate in the community activities held by the common people activity center of the 25-3 building carried by the phase A, so the phase A load of the 3 o ' clock transformer station is suddenly increased, the phase BC load is suddenly reduced, the neutral line current Ie of the 3 o ' clock transformer station exceeds 20% of the design value, the actual value is 22.5% Ie, the yellow lamp of the acousto-optic alarm unit is on, but as the number of the activities is increased, the electricity consumption is increased gradually, the neutral line current is increased from 22.5% Ie to 27.6% Ie, the acousto-optic alarm unit of the over-optic alarm device of the neutral line over-current of the distribution network is red, and simultaneously gives out alarm sound, and finally, the current of the neutral line reaches 31.6% Ie, the acousto-optic alarm unit of the over-current alarm device of the neutral line of the power distribution network is on, at the moment, the mobile terminal of a power distribution manager prompts abnormal station change and abnormal data of the equipment, and immediately sends power distribution rush-repair personnel to arrive at the site, the rush-repair personnel arrive at the site after 10 minutes, the neutral line displacement voltage is treated, hidden dangers are eliminated, and the occurrence of accidents of the power distribution equipment caused by the overlarge current of the neutral line is avoided.
Main technical parameters
1. Electricity test grade: 10 KV;
2. rated capacity: 2kVA, output: current AC 0-200A, voltage 10V;
3. rated frequency: 50Hz, response time: <5 ms;
4. electrode spacing distance: 128 mm;
5. and (3) continuous working time: 10 hours;
6. test time: can be set within 0-1000 min;
7. precision: the current is 1%;
8. protection: overcurrent protection and overheat protection;
9. the use conditions are as follows:
a, the ambient temperature is minus 30 ℃ to plus 70 ℃;
b relative temperature RH is less than or equal to 85 percent (25 ℃);
and the altitude h is less than or equal to 1000 m.
Claims (6)
1. A three-phase load unbalance monitoring system is characterized by comprising a distribution area current acquisition and transmission module, a management area Internet of things data recording unit and a PC (personal computer) end server, wherein the distribution area current acquisition and transmission module is used for sampling a neutral current signal, then carrying out amplification, filtering, analog-to-digital conversion and discrete sampling point calculation on the acquired signal, and transmitting test data to the management area Internet of things data recording unit after calculating the ratio; the management station area Internet of things data recording unit receives transformer current information corresponding to the management station area, records the current information, generates a trend graph, and sends a short message or a micro message to a station area manager mobile phone terminal when the alarm value is exceeded according to a set alarm value; the PC side server takes a management area as a unit, each test point of the transformer of the area to which the PC side server belongs consists of a cloud server to form a network, and a neutral current change database of each transformer of the area is established; and the PC end servers in each area are connected in a networking manner, and data summarization of all monitoring data and report generation are performed.
2. The three-phase load unbalance monitoring system according to claim 1, characterized in that the distribution substation area current acquisition and transmission module comprises an open-close type current transformer, a 220V power supply and measurement conversion module and an Internet of things communication module, wherein the open-close type current transformer, the 220V power supply and measurement conversion module and the Internet of things communication module are wirelessly connected; the open-close type current transformer is clamped on a neutral line to sample neutral line current signals, the range of the open-close type current transformer is 100A or 200A, the open-close type current transformer transmits the collected neutral line current signals to the 220V power supply and measurement conversion module, the 220V power supply and measurement conversion module performs amplification, filtering and analog-to-digital conversion on the signals to calculate discrete sampling points, and test data are transmitted to the Internet of things data recording unit of the management area through the Internet of things communication module after the occupation ratio is calculated.
3. The system according to claim 1, wherein when the PC server needs to monitor the sampled data of a certain test point in real time, the cloud server sends a command to the corresponding monitoring device, and the monitoring device receives the command and transmits the real-time data back to the PC server.
4. The system according to claim 1, wherein when the PC server prompts that the neutral current is 0, the management background automatically or manually operates a switch on the remote control standby neutral line to close to start the standby neutral line.
5. The system according to claim 1, wherein the cell phone terminal of the management station can check real-time data, review historical data and transformer installation location of all transformer neutral currents in the management station at any time.
6. The three-phase load unbalance monitoring system according to claim 1, characterized in that the PC-side server names the installed distribution grid current acquisition and transmission module, including the settings of the test range and alarm threshold, the location of the installation site and the equipment number ledger; and simultaneously, setting a contact telephone and a management authority of a station transformer attribution manager, and establishing station transformer basic information data and a normal value, an alarm value and an abnormal value of the neutral current in a background database of the PC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433385.2A CN112542889A (en) | 2020-12-10 | 2020-12-10 | Three-phase load unbalance monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433385.2A CN112542889A (en) | 2020-12-10 | 2020-12-10 | Three-phase load unbalance monitoring system |
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| CN112542889A true CN112542889A (en) | 2021-03-23 |
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| CN202011433385.2A Pending CN112542889A (en) | 2020-12-10 | 2020-12-10 | Three-phase load unbalance monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115577024A (en) * | 2022-12-07 | 2023-01-06 | 湖南省计量检测研究院 | Method and device for backtracking direct current electric energy value and electronic equipment |
| CN116633017A (en) * | 2023-05-26 | 2023-08-22 | 国网四川省电力公司攀枝花供电公司 | Load monitoring and early warning method and system for branch lines of distribution transformer area |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004111665A1 (en) * | 2003-06-12 | 2004-12-23 | Powertech Industries (Proprietary) Limited | An electrical fault monitoring and control unit |
| CN104377822A (en) * | 2014-11-18 | 2015-02-25 | 柳州市金旭节能科技有限公司 | Low-voltage distribution area monitoring system |
| CN104714081A (en) * | 2015-04-14 | 2015-06-17 | 国网辽宁省电力有限公司抚顺供电公司 | Overcurrent alarming device for neutral line of power distribution network |
-
2020
- 2020-12-10 CN CN202011433385.2A patent/CN112542889A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004111665A1 (en) * | 2003-06-12 | 2004-12-23 | Powertech Industries (Proprietary) Limited | An electrical fault monitoring and control unit |
| CN104377822A (en) * | 2014-11-18 | 2015-02-25 | 柳州市金旭节能科技有限公司 | Low-voltage distribution area monitoring system |
| CN104714081A (en) * | 2015-04-14 | 2015-06-17 | 国网辽宁省电力有限公司抚顺供电公司 | Overcurrent alarming device for neutral line of power distribution network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115577024A (en) * | 2022-12-07 | 2023-01-06 | 湖南省计量检测研究院 | Method and device for backtracking direct current electric energy value and electronic equipment |
| CN115577024B (en) * | 2022-12-07 | 2023-03-14 | 湖南省计量检测研究院 | Method and device for backtracking direct current electric energy value and electronic equipment |
| CN116633017A (en) * | 2023-05-26 | 2023-08-22 | 国网四川省电力公司攀枝花供电公司 | Load monitoring and early warning method and system for branch lines of distribution transformer area |
| CN116633017B (en) * | 2023-05-26 | 2024-04-02 | 国网四川省电力公司攀枝花供电公司 | Load monitoring and early warning method and system for branch lines of distribution transformer area |
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