CN114089120A - Intelligent substation secondary voltage loop fault diagnosis positioning device and method - Google Patents
Intelligent substation secondary voltage loop fault diagnosis positioning device and method Download PDFInfo
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- CN114089120A CN114089120A CN202111417610.8A CN202111417610A CN114089120A CN 114089120 A CN114089120 A CN 114089120A CN 202111417610 A CN202111417610 A CN 202111417610A CN 114089120 A CN114089120 A CN 114089120A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- H02J13/0004—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 involved in a protection system
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a fault diagnosis positioning device and method for a secondary voltage loop of an intelligent substation.A remote control terminal sends a control signal to control a local signal source so as to simulate alternating current and direct current signals with different amplitudes, and the local signal source is connected with a secondary side output port of a PT mutual inductor and provides a driving signal for the secondary voltage loop; the PT mutual inductor transmits the voltage signal to the protection device; the protection device converts the voltage signal into a voltage telemetering signal and transmits the voltage telemetering signal to the master station system; the remote control terminal simulates a master station system, acquires voltage telemetering signals transmitted by the protection device, compares actual voltage analog quantity signals output by the remote control terminal through the local signal source with the voltage telemetering signals transmitted by the protection device, and judges the fault type of the secondary voltage loop. Under the coordination of a model prediction theory, faults of virtual connection, short circuit, phase commutation and the like of a secondary voltage loop are effectively positioned, the on-site operation and maintenance efficiency of the intelligent substation is improved, and the safe operation of a power grid is ensured.
Description
Technical Field
The invention belongs to the field of intelligent substation fault location detection, and relates to an intelligent substation secondary voltage loop fault diagnosis and location device and method.
Background
The intelligent substation achieves certain effect in the aspects of economy, energy conservation, environmental protection and the like due to high system integration and reasonable structural layout. However, in practical applications, many problems are also exposed. Particularly, in the aspect of operation and maintenance of the secondary system of the intelligent substation, the development of the intelligent substation is greatly restricted by heavy maintenance workload and high maintenance cost. At present, the following problems exist in the field operation and maintenance of the secondary system of the intelligent substation:
(1) the structure of the current new generation intelligent substation mainly adopts the mode of analog quantity sampling and GOOSE tripping, and analog quantity is transmitted from the secondary side of a transformer to sampling equipment for protection, wave recording, control and the like through a plurality of transmission media or channels, the quality of the transmission media and whether the wiring of the sampling channels normally and directly influence the safe and reliable operation of a power grid;
(2) at present, the field detection of the secondary system of the intelligent substation mainly focuses on the protection function logic and outlet loop detection of a secondary protection device, but no special detection tool and means are provided for the fault detection of a secondary analog quantity sampling loop, and the current method mainly depends on a primary voltage boosting or through-flow test for indirect verification, so that the maintenance principle of a 'light logic heavy loop' proposed in recent years is violated.
(3) The fault detection method of the secondary circuit of the intelligent substation mainly depends on systems such as an artificial universal meter, a power amplifier and the like, and intelligent fault diagnosis and positioning of the secondary circuit of the intelligent substation cannot be realized in a closed-loop mode.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a fault diagnosis and positioning device and method for a secondary voltage loop of an intelligent substation, solves the problems that various physical wiring faults such as virtual connection, short circuit and phase change of the secondary voltage loop of a protection device are caused, the faults cannot be correctly distinguished and positioned, and the faults cannot be quickly solved, and finally ensures that a power distribution network can reliably and safely supply power.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the utility model provides an intelligent substation secondary voltage return circuit fault diagnosis positioner, includes:
the remote control terminal is electrically connected with the local signal source;
the local signal source is connected with a secondary side end outlet of the PT mutual inductor;
the PT mutual inductor is connected with the protection device;
and one path of the protection device is electrically connected with the remote control terminal, and the other path of the protection device is connected with the master station system.
The invention is further improved in that:
the PT mutual inductor is connected with the protection device through the transmission equipment and the contact.
And the master station client of the remote control terminal is connected with the protection device through an Ethernet interface.
The local signal source adopts a distributed plug-in structure and consists of a power supply plug-in, a CPU plug-in and two voltage amplifier plug-ins; the power supply plug-in provides a power supply and a driving power supply for the CPU plug-in and the voltage amplifier plug-in; the voltage amplifier plug-in outputs three-phase alternating current and direct current voltage signals, and all channels are isolated by adopting relays, so that when a phase voltage fault occurs in single-phase output, the relays can ensure the normal output of the tester; the CPU plug-in is composed of a DA conversion module, an FPGA, an ARM and a monitoring unit, the DA conversion module controls the voltage amplifier plug-in to output amplitude, the FPGA control module drives a relay to physically isolate different voltage output channels, normal simulation of phase-to-phase faults is guaranteed, the ARM carries out related logic calculation and controls a wireless interface module to communicate with a remote control terminal, and the monitoring unit monitors the voltage amplifier plug-in.
The remote control terminal is a handheld platform computer, a virtual IEC61850 master station client and control software are arranged in the remote control terminal, and closed-loop automatic diagnosis and positioning are carried out by controlling the output value of the local signal source and the voltage remote measurement value of the acquisition protection device.
A fault diagnosis and positioning method for a secondary voltage loop of an intelligent substation comprises the following steps:
the remote control terminal sends a control signal to control the local signal source so as to simulate alternating current and direct current signals with different amplitudes, and the local signal source is connected to the output port of the secondary side of the PT mutual inductor and provides a driving signal for a secondary voltage loop;
the PT mutual inductor transmits the voltage signal to the protection device; the protection device converts the voltage signal into a voltage telemetering signal and transmits the voltage telemetering signal to the master station system; the remote control terminal simulates a master station system, acquires voltage telemetering signals transmitted by the protection device, compares actual voltage analog quantity signals output by the remote control terminal through the local signal source with the voltage telemetering signals transmitted by the protection device, and judges the fault type of the secondary voltage loop.
And the remote control terminal acquires the voltage telemetering signal transmitted by the protection device by using the MMS message.
The protection device transmits a voltage telemetering signal to the master station system through an MMS message.
The local signal source is provided with six voltage output channels, the voltage output channels can simulate alternating current and direct current voltage signals with different amplitudes, and secondary side voltage loop signal simulation of the PT mutual inductor is achieved.
Compared with the prior art, the invention has the following beneficial effects:
the remote control terminal is electrically connected with the local signal source, the local signal source is connected with the secondary side end outlet of the PT mutual inductor, and the PT mutual inductor is connected with the protection device; one path of the protection device is electrically connected with the remote control terminal, and the other path of the protection device is connected with the master station system. The fault diagnosis positioning device provided by the invention has a simple structure and is easy to design. Meanwhile, the fault diagnosis positioning method provided by the invention sends a control signal to a local signal source through a remote control terminal, so that the local signal source simulates alternating current and direct current voltage signals with different amplitudes, the local signal source is connected to a secondary side output port of a PT mutual inductor, and a driving signal is provided for a secondary voltage loop; PT mutual-inductor transmits voltage signal to protection device, and protection device converts voltage signal into voltage telemetering measurement signal and carries to main website system, and remote control terminal simulation main website system gathers the voltage telemetering measurement signal that protection device carried, compares the actual voltage analog quantity signal of remote control terminal through local signal source output and the voltage telemetering measurement signal that protection device carried, differentiates the fault type of secondary voltage return circuit. The method can effectively and accurately position various faults of virtual connection, short circuit, phase change and the like of the secondary voltage loop of the intelligent substation, is beneficial to operation and maintenance maintainers to find the secondary voltage loop fault of the intelligent substation in time, realizes quick elimination of the secondary voltage loop fault of the intelligent substation, greatly improves the field operation and maintenance efficiency of the intelligent substation, and ensures safe and reliable operation of a power grid.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a fault diagnosis and location method for a secondary voltage loop of an intelligent substation;
FIG. 2 is a schematic diagram of a secondary voltage loop fault diagnosis positioning device of an intelligent substation;
FIG. 3 is a flow chart of a closed loop test of a secondary voltage loop of an intelligent substation;
fig. 4 is a logic flow diagram for fault diagnosis and location of the whole secondary voltage loop of the intelligent substation.
Wherein: the method comprises the following steps of 1-a main station system, 2-a containing device, 3-transmission equipment, 4-PT mutual inductors, 5-a remote control terminal and 6-a local signal source.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
the technical scheme of the invention is as follows:
1. the remote control terminal 5 carries out remote analog quantity output control on the local signal source 6 through wireless signals, and information interaction control is achieved. The local signal source 6 is provided with six voltage output channels, and the voltage output channels can simulate alternating current and direct current voltage signals with different amplitudes, so that the secondary side voltage loop signal simulation of the intelligent substation PT mutual inductor 4 is realized; the remote control terminal 5 is internally provided with an IEC61850 master station client, the client is connected with the protection device 2 through an Ethernet interface, the voltage telemetering amplitude of the protection device 2 is actively obtained by using an MMS message, and finally a closed-loop hardware structure system capable of sending analog quantity voltage and measuring the voltage telemetering value is formed.
2. An automatic maintenance model is constructed by utilizing a closed-loop automatic test principle, an integral secondary circuit of the intelligent substation is tested, the remote control terminal 5 serves as an output control brain of the on-site signal source, a voltage output channel of the on-site signal source 6 is mapped with a voltage circuit sampling channel of the protection device 2, a voltage remote measurement channel of the protection device 2 corresponding to an IEC61850 main station client of the remote control terminal 5 is mapped with a voltage output channel of the on-site signal source 6, and finally, closed-loop automatic comparison of the voltage circuit channel of the intelligent substation and the voltage output channel of the test system is achieved.
3. A prediction model is constructed on the basis of a closed-loop automatic test principle by utilizing a model prediction theory, various faults of virtual connection, short circuit, phase change and the like of a secondary voltage loop of the intelligent substation are judged according to effective judgment on actual sampling amplitude values of different voltage sampling channels of the intelligent substation protection device 2, and finally the fault of the secondary voltage loop of the intelligent substation is eliminated correctly.
Referring to fig. 1, fig. 1 discloses a method for diagnosing and positioning a fault of a secondary voltage loop of an intelligent substation, which includes:
the intelligent substation's overall structure is that PT mutual-inductor 4 converts primary voltage signal into secondary voltage signal, and secondary voltage signal transmits protection device 2 through relevant transmission equipment 3, contact, and protection device 2 is the digital telemetering measurement signal with signal conversion finally to send to main website system 1 through the MMS newspaper that utilizes IEC61850 communication protocol. The method for diagnosing and positioning the fault of the secondary voltage loop of the intelligent substation comprises the following steps:
firstly, the remote control terminal 5 remotely controls the local signal source 6 to output six analog voltage signals, and the signals of the remote control terminal 5 are isolated by the relay and connected to the secondary side output port of the PT mutual inductor 4 to provide driving signals for the secondary voltage loop of the whole transformer substation. And secondly, the secondary voltage loop is transmitted to the protection device 2 through the related transmission equipment 3 and the contact point, and is sent to the master station system 1 in an MMS message. And finally, the remote control terminal 5 simulates a master station system, voltage telemetering signals sent by the protection device 2 are acquired by using MMS messages, an actual voltage analog quantity signal output by the remote control terminal 5 through the local signal source 6 and corresponding voltage telemetering signals sent by the protection device 2 are intelligently analyzed and compared, and hardware wiring faults such as secondary voltage loop short circuit, virtual connection, phase commutation and the like are determined through logic judgment.
Referring to fig. 2, fig. 2 discloses a principle of the fault diagnosis positioning device for the secondary voltage loop of the intelligent substation, which specifically includes:
the intelligent substation secondary voltage loop fault diagnosis positioning system is mainly composed of an output simulation source formed by a local signal source 6 and a software control analysis module formed by a remote control terminal 5. The local signal source 6 is realized by adopting a distributed plug-in structure and comprises a power supply plug-in, a CPU plug-in, 2 voltage amplifier plug-ins and the like. The power supply plug-in provides a power supply and a driving power supply for the CPU plug-in and the voltage amplifier plug-in; the voltage amplifier plug-in can output 3 crossed direct-current voltage signals, the channels are isolated by adopting relays, and when the single-phase output has an interphase voltage fault, the relays can ensure the normal output of the tester; the CPU plug-in is formed by a DA conversion module, an FPGA, an ARM and a monitoring unit, the DA conversion module controls the voltage amplifier plug-in to output amplitude, the FPGA control module drives a relay to physically isolate different voltage output channels, normal simulation of phase-to-phase faults is guaranteed, the ARM carries out related logic calculation and controls a wireless interface module to communicate with a remote control terminal, the monitoring unit monitors the voltage amplifier plug-in, and fault protection testing equipment can be timely cut off when the voltage output channels have ground short circuit faults. The remote control terminal 5 is essentially a handheld platform computer, an IEC61850 virtual master station and control software are arranged in the remote control terminal, and the local signal source 6 is used for controlling the output value of the local signal source and carrying out closed-loop automatic diagnosis and positioning on the voltage remote measurement value of the acquisition protection device, so that a basis is provided for removing the fault of the secondary voltage circuit of the intelligent substation.
Referring to fig. 3, fig. 3 discloses a closed loop test process of a secondary voltage loop of an intelligent substation, which specifically includes:
the 6 voltage output channels of the test system are directly and physically connected with the whole secondary voltage loop of the intelligent substation on the secondary side of the PT mutual inductor 4, and the mapping relation between the voltage output channels of the test system and the voltage loop acquisition channels of the protection device 2 is established; the IEC61850 main station client actively acquires the voltage remote measurement value of the protection device 2, maps the voltage remote measurement channel of the protection device 2 with the voltage output channel of the local signal source 6, finally realizes the mapping of the voltage channel input into the protection device 2 by the test system and the remote measurement voltage of the protection device 2 uploaded to the IEC61850 main station, and constructs a closed-loop comparison model of voltage sampling and uploading of the protection device 2, thereby realizing the closed-loop test of the secondary voltage loop of the intelligent substation and providing data support for the diagnosis and positioning of the voltage fault of the whole secondary loop of the intelligent substation.
Referring to fig. 4, fig. 4 discloses a logic for implementing fault diagnosis and location of the whole secondary voltage loop of the intelligent substation, which specifically includes:
the test system sequentially applies rated voltage Un to the intelligent substation protection device according to A, B, C phase sequence, and the IEC61850 main station implements voltage telemetering values which are sent to the main station background by the protection device. Establishing a preset criterion in advance according to a prediction model, firstly analyzing the voltage telemetering value obtained by the IEC61850 main station, and judging whether a virtual connection fault occurs in a corresponding phase voltage loop according to whether the voltage telemetering value is 0; secondly, on the premise that the voltage telemetering value is not 0, judging whether a commutation fault and a short-circuit fault occur according to whether the telemetering value of the corresponding test channel is the rated voltage Un; then, according to the amplitude condition of the current untested voltage loop channel, determining the fault type of the tested voltage loop, namely phase change fault, short circuit fault, coefficient error, normal and fault-free loop and the like; and finally, performing a round of closed loop judgment and diagnosis on all voltage loops in sequence, confirming the loop fault type, and automatically generating a related fault diagnosis detection report.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an intelligent substation secondary voltage return circuit fault diagnosis positioner which characterized in that includes:
the remote control terminal (5), the said remote control terminal (5) connects the local signal source (6) electrically;
the local signal source (6), the local signal source (6) is connected with a secondary side end outlet of the PT mutual inductor (4);
the PT mutual inductor (4), the PT mutual inductor (4) is connected with the protection device (2);
the protection device (2), the protection device (2) is connected with remote control terminal (5) by electricity all the way, and another way is connected with main website system (1).
2. The intelligent substation secondary voltage circuit fault diagnosis positioning device of claim 1, characterized in that the PT transformer (4) is connected with the protection device (2) through a transmission device (3) and a contact.
3. The intelligent substation secondary voltage loop fault diagnosis positioning device according to claim 1, characterized in that the master station client of the remote control terminal (5) is connected with the protection device (2) through an ethernet interface.
4. The intelligent substation secondary voltage loop fault diagnosis positioning device according to claim 1, wherein the in-situ signal source (6) adopts a distributed plug-in structure and is composed of a power plug-in, a CPU plug-in and two voltage amplifier plug-ins; the power supply plug-in provides a power supply and a driving power supply for the CPU plug-in and the voltage amplifier plug-in; the voltage amplifier plug-in outputs three-phase alternating current and direct current voltage signals, and all channels are isolated by adopting relays, so that when a phase voltage fault occurs in single-phase output, the relays can ensure the normal output of the tester; the CPU plug-in is composed of a DA conversion module, an FPGA, an ARM and a monitoring unit, the DA conversion module controls the voltage amplifier plug-in to output amplitude, the FPGA control module drives a relay to physically isolate different voltage output channels, normal simulation of phase-to-phase faults is guaranteed, the ARM carries out related logic calculation and controls a wireless interface module to communicate with a remote control terminal, and the monitoring unit monitors the voltage amplifier plug-in.
5. The intelligent substation secondary voltage loop fault diagnosis positioning device according to claim 1, wherein the remote control terminal (5) is a handheld platform computer, a virtual IEC61850 master station client and control software are built in, and closed-loop automatic diagnosis positioning is performed by controlling an output value of the local signal source (6) and collecting a voltage remote measurement value of the protection device.
6. The method for diagnosing and positioning the fault of the secondary voltage loop of the intelligent substation is characterized by comprising the following steps of:
the remote control terminal (5) sends a control signal to control the local signal source (6) so as to enable the local signal source to simulate alternating current and direct current signals with different amplitudes, the local signal source is connected to the secondary side output port of the PT mutual inductor (4) and provides a driving signal for a secondary voltage loop;
the PT mutual inductor (4) transmits the voltage signal to the protection device (2); the protection device (2) converts the voltage signal into a voltage telemetering signal and transmits the voltage telemetering signal to the master station system (1); the remote control terminal (5) simulates a master station system, acquires voltage telemetering signals transmitted by the protection device (2), and judges the fault type of a secondary voltage loop by comparing actual voltage analog quantity signals output by the remote control terminal (5) through the local signal source (6) with the voltage telemetering signals transmitted by the protection device (2).
7. The intelligent substation secondary voltage loop fault diagnosis positioning method according to claim 6, characterized in that the remote control terminal (5) utilizes the voltage telemetry signal transmitted by the MMS message acquisition protection device (2).
8. The intelligent substation secondary voltage loop fault diagnosis positioning method according to claim 6, characterized in that the protection device (2) transmits a voltage telemetry signal to the master station system (1) through an MMS message.
9. The intelligent substation secondary voltage loop fault diagnosis positioning method according to claim 6, wherein the local signal source (6) has six voltage output channels, and the voltage output channels can simulate alternating current and direct current voltage signals with different amplitudes to realize secondary side voltage loop signal simulation of the PT transformer (4).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115754881A (en) * | 2023-01-04 | 2023-03-07 | 武汉格蓝若智能技术股份有限公司 | Method and device for judging virtual connection of secondary side loop of voltage transformer |
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