CN114006471A - Substation direct current system monitoring method and system - Google Patents

Substation direct current system monitoring method and system Download PDF

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Publication number
CN114006471A
CN114006471A CN202111246092.8A CN202111246092A CN114006471A CN 114006471 A CN114006471 A CN 114006471A CN 202111246092 A CN202111246092 A CN 202111246092A CN 114006471 A CN114006471 A CN 114006471A
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China
Prior art keywords
fault
direct current
output
analysis result
determining
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Pending
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CN202111246092.8A
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Chinese (zh)
Inventor
谢培鑫
郑跃斌
谢伟宏
陈振昕
郑晓滨
黄峤
吴添权
何宏冲
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Chaozhou Electric Power Design Office
Guangdong Power Grid Co Ltd
Chaozhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Chaozhou Electric Power Design Office
Guangdong Power Grid Co Ltd
Chaozhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Application filed by Chaozhou Electric Power Design Office, Guangdong Power Grid Co Ltd, Chaozhou Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Chaozhou Electric Power Design Office
Priority to CN202111246092.8A priority Critical patent/CN114006471A/en
Publication of CN114006471A publication Critical patent/CN114006471A/en
Pending legal-status Critical Current

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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]
    • 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
    • H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • 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
    • H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • 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
    • 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
    • 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
    • Y04S40/126—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 using wireless data transmission

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

Abstract

The invention discloses a method and a system for monitoring a direct current system of a transformer substation. The transformer substation direct current system monitoring method comprises the following steps: acquiring output currents of a direct current bus, a storage battery and a charger; acquiring output voltages of a direct current bus, a storage battery and a charger; determining a fault analysis result based on the output current, the output voltage and a preset fault rule; and sending the fault analysis result to the mobile terminal. By adopting the scheme, the real-time monitoring of the direct current system by the operators is realized, and the input of manpower and material resources is reduced.

Description

Substation direct current system monitoring method and system
Technical Field
The embodiment of the invention relates to the online monitoring technology of a transformer substation, in particular to a method and a system for monitoring a direct current system of the transformer substation.
Background
The direct current system of the transformer substation provides power for control, protection and automation devices in the transformer substation, and whether the direct current system can stably operate also relates to the normal work of the devices. Therefore, the charging screen of the direct current system is provided with the monitoring device for monitoring the whole operation device of the direct current system, including bus voltage and current, storage battery voltage and current, the operation state of a charger and the like, and when the equipment is abnormal, the monitoring device can give an alarm in time. However, in the daily operation process, the charging screen of the direct current system also has an abnormal monitoring function, and in this case, the operation state of the direct current system cannot be normally monitored by a scheduling monitoring class, so that operators are often required to go to a substation for someone to watch the substation until the fault is eliminated. The condition brings great consumption of manpower and material resources for transformer substation operators, and meanwhile, certain careless possibility exists in manual monitoring, so that the safe operation of equipment is not facilitated.
Disclosure of Invention
The invention provides a method and a system for monitoring a direct current system of a transformer substation, which are used for realizing the effect that operators monitor the direct current system in real time and reducing the investment of manpower and material resources.
In a first aspect, an embodiment of the present invention provides a method for monitoring a dc system of a substation, where the method for monitoring a dc system of a substation includes:
acquiring output currents of a direct current bus, a storage battery and a charger;
acquiring output voltages of a direct current bus, a storage battery and a charger;
determining a fault analysis result based on the output current, the output voltage and a preset fault rule;
and sending the fault analysis result to the mobile terminal.
In an optional embodiment of the present invention, the determining a fault analysis result based on the output current, the output voltage and a preset fault rule includes:
determining whether the output current or the output voltage exceeds a preset early warning range;
if yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
In an optional embodiment of the present invention, the determining a fault analysis result based on the output current, the output voltage and a preset fault rule includes:
determining an insulation resistance based on the output current and the output voltage;
determining whether the insulation resistance value is lower than a preset resistance value;
if yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
In an optional embodiment of the present invention, after determining the fault analysis result based on the output current, the output voltage and a preset fault rule, the method further includes:
displaying at least one of the output current, the output voltage, and the fault analysis result.
In an optional embodiment of the present invention, before determining the fault analysis result based on the output current, the output voltage and a preset fault rule, the method further includes:
acquiring a first time when the traveling wave signal reaches a bus on one side of the line and a second time when the traveling wave signal reaches the bus on the other side of the line;
determining a fault analysis result based on the output current, the output voltage and a preset fault rule, comprising:
determining a fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule.
In an optional embodiment of the present invention, the determining the fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule includes:
determining fault information based on the transmission current, the output voltage and a preset fault rule;
determining a fault distance based on the first time and the second time;
correspondingly, the sending the fault analysis result to the mobile terminal includes:
and sending the fault information and the fault distance to a mobile terminal.
In an optional embodiment of the invention, the determining the fault distance based on the first time and the second time comprises:
determining a fault distance through a distance formula based on the first time and the second time;
the distance formula is: XL [ (Ts-TR) v + L ]/2);
wherein Ts is a first time, TR is a second time, v is a traveling wave traveling speed, L is a line length, and XL is a fault distance.
In a second aspect, an embodiment of the present invention further provides a transformer substation dc system monitoring system, where the transformer substation dc system monitoring system includes a current collecting device, a voltage collecting device, a controller, and a wireless communication module;
the current acquisition device is electrically connected with the controller and is used for acquiring output currents of the direct current bus, the storage battery and the charger;
the voltage acquisition device is electrically connected with the controller and is used for acquiring output voltages of the direct current bus, the storage battery and the charger;
the controller is electrically connected with the wireless communication module and is used for communicating with a mobile terminal through the wireless communication module;
the controller is used for executing the substation direct current system monitoring method in any embodiment of the invention.
In an alternative embodiment of the invention, the current collection device comprises a current transducer;
and/or the voltage acquisition device comprises a voltage transmitter;
and/or the wireless communication module comprises a DTU wireless data transmission module.
In an optional embodiment of the present invention, the substation dc system monitoring system further comprises at least one of:
and the display device is electrically connected with the controller and is used for displaying at least one of output current, output voltage and a fault analysis result.
And the traveling wave acquisition device is electrically connected with the controller and is used for acquiring traveling wave signals on two sides of the line.
According to the method, the output current of the direct current bus, the storage battery and the charger and the output voltage of the direct current bus, the storage battery and the charger are obtained, then a fault analysis result is determined based on the output current, the output voltage and a preset fault rule, and finally the fault analysis result is sent to the mobile terminal. Therefore, the transformer substation direct-current system can be remotely monitored, the investment of manpower and material resources of operators is greatly reduced, meanwhile, the fault analysis result can be sent to the mobile terminal remotely in time, the operators can find faults in time through the mobile terminal, the real-time monitoring of the operators on the direct-current system is realized, and the effect of the investment of the manpower and material resources is reduced.
Drawings
Fig. 1 is a flowchart of a method for monitoring a dc system of a substation according to an embodiment of the present invention;
fig. 2 is a flowchart of a substation dc system monitoring method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a monitoring method for a dc system of a substation according to a third embodiment of the present invention;
fig. 4 is a flowchart of step S340 of determining a fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule in the third embodiment of the present invention;
fig. 5 is a block diagram of a dc monitoring system of a substation according to a fourth embodiment of the present invention.
41, a controller; 42. a current collection device; 43. a voltage acquisition device; 44. a traveling wave collection device; 45. a display device; 46. and a wireless communication module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a substation dc system monitoring method according to an embodiment of the present invention, where this embodiment is applicable to a substation dc system monitoring situation, and the method may be executed by a substation dc system monitoring system, and as shown in fig. 1, the substation dc system monitoring method specifically includes the following steps:
and S110, acquiring output currents of the direct current bus, the storage battery and the charger.
The bus bar is a common passage to which a plurality of devices are connected in parallel and branched. In an electric power system, a bus bar connects together various current-carrying branch circuits in a distribution device, and functions to collect, distribute, and transfer electric energy. The direct current bus refers to a bus in a substation direct current system.
The storage battery is a chemical battery for converting chemical energy into electric energy in a direct current system of the transformer substation.
The charger is characterized in that a high-frequency power supply technology is adopted in a direct-current system of the transformer substation, and an advanced intelligent dynamic adjustment charging technology is applied. The intelligent three-stage charging mode of constant current, constant voltage and small constant current is adopted, and the intelligent three-stage charging device has the characteristics of high charging efficiency, simplicity in operation, light weight, small size and the like.
The output current refers to the current output by the output ends of the direct current bus, the storage battery and the charger when the direct current system of the transformer substation operates.
And S120, acquiring output voltages of the direct current bus, the storage battery and the charger.
The output voltage refers to the voltage output by the output ends of the direct current bus, the storage battery and the charger when the direct current system of the transformer substation operates.
And S130, determining a fault analysis result based on the output current, the output voltage and a preset fault rule.
The preset fault rule is a rule which is preset in advance and used for judging whether the direct-current system of the transformer substation fails according to the output current and the output voltage. The fault analysis result refers to the result of whether the direct current system of the transformer substation fails and the fault type obtained by analyzing the output current and the output voltage. When the direct current system of the transformer substation is in a normal motion state, the output current and the output voltage have a certain normal motion range, so that the fault condition of the direct current system of the transformer substation can be judged through the output current, the output voltage and a preset fault rule, and further a fault analysis result is determined.
And S140, sending the fault analysis result to the mobile terminal.
The mobile terminal refers to computer equipment which can be used in moving and is used by workers related to the operation of a direct current system of a transformer substation, and the mobile terminal broadly comprises a mobile phone, a notebook computer, a tablet personal computer, a POS machine and even a vehicle-mounted computer. But most often refer to cell phones or smart phones and tablets with multiple application functions.
In addition, the execution sequence of steps S110 and S120 may be multiple, for example, steps S110 and S120 may be executed simultaneously; or after executing S110, executing S120; or after performing S120, performing S130 and S110. The execution sequence of steps S110 and S120 may be various according to different application scenarios and usage requirements, and is not specifically limited herein as long as steps S110 and S120 are executed before S130.
According to the scheme, the output current of the direct current bus, the storage battery and the charger and the output voltage of the direct current bus, the storage battery and the charger are obtained, then the fault analysis result is determined based on the output current, the output voltage and the preset fault rule, and finally the fault analysis result is sent to the mobile terminal. Therefore, the transformer substation direct-current system can be remotely monitored, the investment of manpower and material resources of operators is greatly reduced, meanwhile, the fault analysis result can be sent to the mobile terminal remotely in time, the operators can find faults in time through the mobile terminal, the real-time monitoring of the operators on the direct-current system is realized, and the effect of the investment of the manpower and material resources is reduced.
For example, the determining a fault analysis result based on the output current, the output voltage and a preset fault rule includes:
and determining whether the output current or the output voltage exceeds a preset early warning range.
If yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
The preset early warning range refers to the fluctuation range of output current and output voltage when the direct current system of the transformer substation normally operates. In a specific embodiment, the preset early warning range includes a preset current early warning range and a preset voltage early warning range, and when the output current is higher than an upper limit value of the preset current early warning range or lower than a lower limit value of the preset current early warning range, a possible fault of the substation direct current system is described. And when the output voltage is higher than the upper limit value of the preset voltage early warning range or lower than the lower limit value of the preset voltage early warning range, the possible fault of the transformer substation direct current system is indicated. Therefore, whether the output current or the output voltage exceeds the preset early warning range or not can be conveniently determined, and whether the direct current system of the transformer substation has the suspected fault condition or not can be conveniently determined.
For example, the determining a fault analysis result based on the output current, the output voltage and a preset fault rule includes:
an insulation resistance is determined based on the output current and the output voltage.
Determining whether the insulation resistance value is lower than a preset resistance value.
If yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
The insulation resistance refers to a resistance corresponding to leakage current flowing through the dielectric medium after a certain time of polarization process by applying direct current voltage to the dielectric medium. Therefore, in the direct current system of the transformer substation, the direct current bus, the storage battery and the charger all have insulation resistance. Knowing the output voltage and output current, the insulation resistance can be calculated according to ohm's law. The preset resistance value is the minimum value of the insulation resistance when the transformer substation direct current system normally operates, and when the transformer substation direct current system has a ground fault (positive ground, negative ground or positive and negative ground at the same time), the insulation resistance is lower than the preset resistance value. Therefore, whether the direct current system of the transformer substation has the ground fault or not can be conveniently determined by determining the insulation resistance based on the output current and the output voltage and then determining whether the insulation resistance is lower than a preset resistance value or not.
Example two
Fig. 2 is a flowchart of a substation dc system monitoring method according to a second embodiment of the present invention, which is optimized based on the first embodiment. Optionally, after determining a fault analysis result based on the output current, the output voltage, and a preset fault rule, the method further includes: displaying at least one of the output current, the output voltage, and the fault analysis result.
As shown in fig. 2, the method for monitoring the dc system of the substation specifically includes the following steps:
s210, obtaining output currents of the direct current bus, the storage battery and the charger.
And S220, acquiring output voltages of the direct current bus, the storage battery and the charger.
And S230, determining a fault analysis result based on the output current, the output voltage and a preset fault rule.
And S240, sending the fault analysis result to the mobile terminal.
And S250, displaying at least one of the output current, the output voltage and the fault analysis result.
The display can be displayed on display equipment of the transformer substation direct current system, display equipment of a transformer substation direct current system monitoring system and a mobile terminal of an operator. Through showing at least one in output current, output voltage and the fault analysis result, operating personnel can be timely convenient look over output current, output voltage and fault analysis result isoparametric, the remote monitoring direct current system of transformer substation of being convenient for, also be convenient for simultaneously operating personnel in time discover the trouble.
EXAMPLE III
Fig. 3 is a flowchart of a monitoring method for a dc system of a substation according to a third embodiment of the present invention, and the embodiment of the present invention is optimized based on the second embodiment. Optionally, before determining a fault analysis result based on the output current, the output voltage, and a preset fault rule, the method further includes: acquiring a first time when the traveling wave signal reaches a bus on one side of the line and a second time when the traveling wave signal reaches the bus on the other side of the line; determining a fault analysis result based on the output current, the output voltage and a preset fault rule, comprising: determining a fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule.
As shown in fig. 2, the method for monitoring the dc system of the substation specifically includes the following steps:
and S310, acquiring output currents of the direct current bus, the storage battery and the charger.
And S320, acquiring output voltages of the direct current bus, the storage battery and the charger.
S330, acquiring a first time when the traveling wave signal reaches the bus on one side of the line and a second time when the traveling wave signal reaches the bus on the other side of the line.
The traveling wave signal refers to a related signal of a fault initial current traveling wave when a direct current system has a ground fault. The line refers to an electric wire for transmitting current in a direct current system of a transformer substation, and two ends of the line are generally connected with different buses.
S340, determining a fault analysis result based on the output current, the output voltage, the first moment, the second moment and a preset fault rule.
When the direct current system of the transformer substation has a ground fault, a fault position can generate a traveling wave signal, and the traveling wave signal can be transmitted to buses at two ends of a line at the same operation speed, so that the distance between the ground fault and the direct current system monitoring system of the transformer substation can be measured by analyzing and calculating through acquiring a first moment when the traveling wave signal reaches the bus on one side of the line and a second moment when the traveling wave signal reaches the bus on the other side of the line, a ground fault point can be conveniently and quickly found by an operator, the ground fault can be timely eliminated, and the safe and stable operation of the direct current system of the transformer substation can be guaranteed.
And S350, sending the fault analysis result to the mobile terminal.
And S360, displaying at least one of the output current, the output voltage and the fault analysis result.
On the basis of the foregoing embodiment, as shown in fig. 4, the determining the fault analysis result based on the output current, the output voltage, the first time, the second time, and a preset fault rule includes:
and S341, determining fault information based on the transmission current, the output voltage and a preset fault rule.
The fault information refers to information reflecting whether the direct current system of the transformer substation is in fault or not.
For example, the determining fault information based on the transmission current, the output voltage and a preset fault rule includes:
and determining whether the output current or the output voltage exceeds a preset early warning range.
If yes, determining suspected faults of the direct current system of the transformer substation and generating fault information.
Whether the output current or the output voltage exceeds a preset early warning range or not is determined, whether the situation that a suspected fault occurs in a direct current system of the transformer substation exists or not can be conveniently determined, and then fault information can be conveniently determined.
For example, the determining fault information based on the transmission current, the output voltage and a preset fault rule includes:
an insulation resistance is determined based on the output current and the output voltage.
Determining whether the insulation resistance value is lower than a preset resistance value.
If yes, determining suspected faults of the direct current system of the transformer substation and generating fault information.
The insulation resistance is determined based on the output current and the output voltage, whether the insulation resistance value is lower than a preset resistance value or not is determined, whether the direct current system of the transformer substation has a ground fault or not can be determined conveniently, and then fault information can be determined conveniently.
And S342, determining a fault distance based on the first time and the second time.
The fault distance refers to the distance between a ground fault and a substation direct current system monitoring system, when the substation direct current system has the ground fault, a fault position can generate a traveling wave signal, and the traveling wave signal can be transmitted to buses at two ends of a line at the same running speed, so that the distance between the ground fault and the substation direct current system monitoring system can be measured by analyzing and calculating by acquiring a first moment when the traveling wave signal reaches the bus on one side of the line and a second moment when the traveling wave signal reaches the bus on the other side of the line, and the fault distance can be conveniently determined according to the first moment and the second moment.
Correspondingly, the sending the fault analysis result to the mobile terminal includes: and sending the fault information and the fault distance to a mobile terminal.
The fault information and the fault distance are both sent to the mobile terminal, so that operating personnel can find fault points quickly and conveniently, and defects are eliminated in time.
Illustratively, the determining the fault distance based on the first time and the second time comprises: determining a fault distance by a distance formula based on the first time and the second time.
The distance formula is: XL [ (Ts-TR) v + L ]/2); wherein Ts is a first time, TR is a second time, v is a traveling wave traveling speed, L is a line length, and XL is a fault distance.
The traveling wave traveling speed refers to the speed of traveling waves corresponding to traveling wave signals transmitted on a line, and the fault distance can be conveniently calculated according to the known line length and the traveling wave traveling speed on the basis of measuring and calculating the first moment and the second moment through a distance formula, so that the traveling wave traveling speed is convenient to use.
In an optional embodiment of the present invention, after the sending the fault analysis result to the mobile terminal, the method further includes:
and acquiring processing mode information input by the mobile terminal based on the fault analysis result.
And correlating the processing mode information, the transmission current, the output voltage, the first time, the second time and the fault analysis result and storing the correlation results into a historical processing database.
The processing mode information refers to information related to operations such as maintenance, repair, inspection, and the like performed by an operator on a fault location.
By associating and storing the processing mode information, the transmission current, the output voltage, the first time, the second time, and the fault analysis result in a historical processing database, the operator can know the output current, the output voltage, the first time, the second time, and the like under different fault conditions, and can know the processing mode of the operator under the corresponding fault condition.
On the basis of the above embodiment, before determining the fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule, the method further includes:
and determining the historical processing mode information with the maximum similarity in a historical processing database based on the output current, the output voltage, the first time and the second time.
Correspondingly, the determining a fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule includes:
and determining a fault analysis result based on the output current, the output voltage, the first moment, the second moment, the historical processing mode information and a preset fault rule.
The maximum similarity means that the matching degree of information such as the output current, the output voltage, the first time and the second time is the highest, for example, the output current, the output voltage, the first time and the second time in the current operation state are nearly the same as the output current, the output voltage, the first time and the second time of a certain historical fault event in a historical processing database, and at the moment, historical processing mode information of the historical fault event is determined, so that an operator can know how to process the fault in the historical similar state and can use the fault as a reference, thereby rapidly processing the fault situation and reducing the experience dependence on the operator.
On the basis of the above embodiment, the displaying at least one of the output current, the output voltage, and the fault analysis result includes:
and displaying at least one of the output current, the output voltage, historical processing mode information and the fault analysis result.
The history processing mode information is displayed, and an operator can conveniently check the history processing mode information.
Example four
Fig. 5 is a block diagram of a dc monitoring system of a substation according to a fourth embodiment of the present invention, and as shown in fig. 5, the dc monitoring system of the substation includes a current collecting device 42, a voltage collecting device 43, a controller 41, and a wireless communication module 46.
The current collecting device 42 is electrically connected with the controller 41, and the current collecting device 42 is used for collecting output currents of the direct current bus, the storage battery and the charger.
The voltage acquisition device 43 is electrically connected with the controller 41, and the voltage acquisition device 43 is used for acquiring output voltages of the direct current bus, the storage battery and the charger.
The controller 41 is electrically connected to the wireless communication module 46 for communicating with the mobile terminal through the wireless communication module 46.
The controller 41 is configured to execute the substation dc system monitoring method according to any embodiment of the present invention.
The current collection device 42 is a device capable of collecting current, and the current collection device 42 is connected with the output ends of the direct current bus, the storage battery and the charger, so that the output current of the direct current bus, the storage battery and the charger can be conveniently collected.
The voltage acquisition device 43 is a device capable of acquiring current, and the voltage acquisition device 43 is connected with the output ends of the direct current bus, the storage battery and the charger, so that the output voltages of the direct current bus, the storage battery and the charger can be conveniently acquired.
The wireless communication module 46 is widely used in the fields of vehicle monitoring, remote control, telemetry, small wireless networks, wireless meter reading, access control systems, cell paging, industrial data acquisition systems, wireless tags, identification, non-contact RF smart cards, small wireless data terminals, fire safety systems, wireless remote control systems, bio-signal acquisition, hydrographic monitoring, robotic control, wireless 232 data communication, wireless 485/422 data communication, digital audio, digital image transmission, etc. Remote communication between the mobile terminal and the controller 41 can be achieved.
The controller 41 (english name: controller) refers to a master device for controlling the starting, speed regulation, braking and reverse of the motor by changing the wiring of the master circuit or the control circuit and changing the resistance value in the circuit according to a predetermined sequence. It is composed of program counter, instruction register, instruction decoder, timing generator and operation controller 41, and is the "decision mechanism" for issuing commands, i.e. coordinating and directing the operation of the whole computer system.
According to the scheme, the current collection device 42 is used for collecting the output current of the direct current bus, the storage battery and the charger, the voltage collection device 43 is used for obtaining the output voltage of the direct current bus, the storage battery and the charger, then the controller 41 determines a fault analysis result based on the output current, the output voltage and a preset fault rule, and finally the fault analysis result is sent to the mobile terminal through the wireless communication module 46. Therefore, the transformer substation direct current system can be remotely monitored, the investment of manpower and material resources of operators is greatly reduced, meanwhile, the fault analysis result can be sent to the mobile terminal remotely in time, and the operators can find faults in time through the mobile terminal conveniently. Meanwhile, the transformer substation direct current system monitoring system is convenient to install, can be installed on a field transformer substation direct current system without power failure, and is used as a standby device of a field original direct current monitoring device to run synchronously; when the original direct current monitoring device on the site fails and the dispatching end cannot monitor and is handed over to the site operators for monitoring, the direct current system monitoring system for the transformer substation can be used for remote real-time monitoring, so that the investment of manpower and material resources of the operators is greatly reduced.
In an alternative embodiment of the present invention, current collection device 42 comprises a current transducer.
The current transducer can directly convert alternating current or direct current of a main circuit to be measured into DC 4-20 mA (DC 1-5V is converted through a 250 omega resistor or DC 2-10V is converted through a 500 omega resistor) constant current loop standard signals output according to a linear proportion, and the signals are continuously transmitted to a receiving device (a computer or a display instrument). Therefore, by making the current collection device 42 include the current transducer, the output current of the dc bus, the storage battery, and the charger can be conveniently detected.
In an alternative embodiment of the invention, the voltage acquisition means 43 comprise a voltage transmitter.
The voltage transducer is a device which converts the measured alternating voltage, direct voltage and pulse voltage into the linear proportion to output the direct voltage or direct current and isolate and output the analog signal or digital signal. Therefore, the voltage acquisition device 43 includes a voltage transmitter, so that the output voltages of the direct current bus, the storage battery and the charger can be conveniently detected.
In an alternative embodiment of the present invention, the wireless communication module 46 comprises a DTU wireless data transmission module.
The DTU wireless data transmission module is designed in a low power consumption mode, data are transmitted remotely in a GPRS or short message mode, the DTU wireless data transmission module is particularly suitable for monitoring occasions of solar power supply, solar power supply cost can be greatly reduced, construction difficulty is reduced, and the DTU wireless data transmission module is widely applied to industries such as meteorology, hydrology and water conservancy, geology and the like. Because the direct current system of transformer substation has more relevant equipment, the distance between the data center and the on-site acquisition point is not limited through the DTU wireless data transmission module, the DTU wireless data transmission module is applied to enable the direct current system monitoring system of transformer substation and the mobile terminal to communicate, the power consumption is low, and the distance is not limited.
In an optional embodiment of the present invention, the substation dc system monitoring system further includes a display device 45, the display device 45 is electrically connected to the controller 41, and the display device 45 is configured to display at least one of the output current, the output voltage, and the fault analysis result.
The display device 45 may also be referred to as a display, or a display screen or a screen in popular terms. Is a device that can output images or tactile information, such as a braille display designed for the blind. If the input signal is an electronic signal, such a display device 45 will be referred to as an electronic display device 45, as opposed to a mechanical display device 45. By making the substation dc system monitoring system further include the display device 45, at least one of the output current, the output voltage, and the fault analysis result can be conveniently displayed on the substation dc system monitoring system.
In an alternative embodiment of the present invention, the traveling wave collecting device 44 is electrically connected to the controller 41, and the traveling wave collecting device 44 is used for collecting traveling wave signals on two sides of the line.
The traveling wave collecting device 44 is a device capable of collecting a traveling wave signal, and in a specific embodiment, the traveling wave collecting device 44 may be a traveling wave sensor.
By collecting the traveling wave signals on two sides of the line, a first time when the traveling wave signals reach the bus on one side of the line and a second time when the traveling wave signals reach the bus on the other side of the line can be respectively obtained, and therefore the fault position of the line is determined.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A transformer substation direct current system monitoring method is characterized by comprising the following steps:
acquiring output currents of a direct current bus, a storage battery and a charger;
acquiring output voltages of a direct current bus, a storage battery and a charger;
determining a fault analysis result based on the output current, the output voltage and a preset fault rule;
and sending the fault analysis result to the mobile terminal.
2. The substation direct current system monitoring method of claim 1, wherein the determining a fault analysis result based on the output current, the output voltage and a preset fault rule comprises:
determining whether the output current or the output voltage exceeds a preset early warning range;
if yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
3. The substation direct current system monitoring method of claim 1, wherein the determining a fault analysis result based on the output current, the output voltage and a preset fault rule comprises:
determining an insulation resistance based on the output current and the output voltage;
determining whether the insulation resistance value is lower than a preset resistance value;
if yes, determining suspected faults of the direct current system of the transformer substation and generating a fault analysis result.
4. The substation direct current system monitoring method according to any one of claims 1 to 3, wherein after determining a fault analysis result based on the output current, the output voltage and a preset fault rule, further comprising:
displaying at least one of the output current, the output voltage, and the fault analysis result.
5. The substation direct current system monitoring method of claim 1, before determining a fault analysis result based on the output current, the output voltage and a preset fault rule, further comprising:
acquiring a first time when the traveling wave signal reaches a bus on one side of the line and a second time when the traveling wave signal reaches the bus on the other side of the line;
determining a fault analysis result based on the output current, the output voltage and a preset fault rule, comprising:
determining a fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule.
6. The substation direct current system monitoring method of claim 5, wherein the fault analysis result comprises fault information and a fault distance, and the determining the fault analysis result based on the output current, the output voltage, the first time, the second time and a preset fault rule comprises:
determining fault information based on the transmission current, the output voltage and a preset fault rule;
determining a fault distance based on the first time and the second time;
correspondingly, the sending the fault analysis result to the mobile terminal includes:
and sending the fault information and the fault distance to a mobile terminal.
7. The substation direct current system monitoring method of claim 6, wherein the determining a fault distance based on the first time and the second time comprises:
determining a fault distance through a distance formula based on the first time and the second time;
the distance formula is: XL [ (Ts-TR) v + L ]/2);
wherein Ts is a first time, TR is a second time, v is a traveling wave traveling speed, L is a line length, and XL is a fault distance.
8. The utility model provides a direct current system monitoring system of transformer substation which characterized in that: comprises a current acquisition device (42), a voltage acquisition device (43), a controller (41) and a wireless communication module (46);
the current acquisition device (42) is electrically connected with the controller (41), and the current acquisition device (42) is used for acquiring output currents of a direct current bus, a storage battery and a charger;
the voltage acquisition device (43) is electrically connected with the controller (41), and the voltage acquisition device (43) is used for acquiring output voltages of a direct current bus, a storage battery and a charger;
the controller (41) is electrically connected with the wireless communication module (46) and is used for communicating with a mobile terminal through the wireless communication module (46);
the controller (41) is configured to perform the substation dc system monitoring method of any one of claims 1-7.
9. A substation DC system monitoring system according to claim 8, characterized in that the current collection device (42) comprises a current transmitter;
and/or the voltage acquisition device (43) comprises a voltage transmitter;
and/or the wireless communication module (46) comprises a DTU wireless data transmission module.
10. The substation dc system monitoring system according to claim 8 or 9, further comprising at least one of:
a display device (45), the display device (45) being electrically connected to the controller (41), the display device (45) being configured to display at least one of an output current, an output voltage, and a fault analysis result.
The traveling wave acquisition device (44), the traveling wave acquisition device (44) with controller (41) electricity is connected, traveling wave acquisition device (44) are used for gathering the traveling wave signal of circuit both sides.
CN202111246092.8A 2021-10-26 2021-10-26 Substation direct current system monitoring method and system Pending CN114006471A (en)

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