CN113702894A - Fault diagnosis method and device for remote module and merging unit - Google Patents
Fault diagnosis method and device for remote module and merging unit Download PDFInfo
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Abstract
The application discloses a fault diagnosis method and device for a remote module and a merging unit, which comprise the following steps: acquiring a voltage signal, wherein the voltage signal is transmitted to an analog quantity voltage for generation after being transmitted by a sensor for one time; acquiring an Ethernet signal, and performing data protocol conversion on the acquired voltage signal by a remote module to obtain the Ethernet signal; calculating the difference between the voltage signal and the Ethernet signal; judging whether the remote module is normal or not through comparison and analysis; if the fault diagnosis result of the far-end module is normal, whether the Ethernet signal is normal or not is continuously judged, if the Ethernet signal is also normal, the difference value between the voltage signal and the output signal of the merging unit is continuously judged, and the above operations are repeated until the fault diagnosis result of a certain section in a transmission loop is found to be abnormal. Through detecting the transmission loop of the direct current transformer section by section, the accuracy of the fault is judged, a large amount of manual operation is not needed, and the working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a fault diagnosis method and device for a remote module and a merging unit.
Background
With the continuous development of the direct-current transmission technology, more and more direct-current engineering construction is put into use. The direct current transformer is used as an important measuring device and widely applied to a converter station, and provides direct current voltage and current values for normal operation control protection of a system.
The direct current electronic mutual inductor widely applied at present mainly comprises a voltage divider and a current divider, converts the voltage divider and the current divider into a small voltage signal of analog quantity, collects, converts and sends the small voltage signal, is called a secondary loop, mainly comprises a far-end module, an optical fiber and a merging unit, is influenced by the environment and devices per se, easily causes the change of the performance and the measurement error precision, even causes the abnormality of the whole measurement link due to the damage of the components, and further causes the locking or the shutdown of a direct current system.
The conventional method for judging the fault of the secondary circuit of the direct current transformer is mainly based on a manual inspection mode, the direct current transformer is comprehensively inspected in a manual mode to ensure the normal operation of the direct current transformer, but the fault problem of the secondary circuit of the direct current transformer cannot be timely judged and processed, and the fault of the secondary circuit is not clear, so that great troubles are brought to troubleshooting, power failure maintenance and the like.
Disclosure of Invention
The invention provides a fault diagnosis method and a fault diagnosis device for a remote module and a merging unit, which are used for solving the problems that the judgment and the processing cannot be carried out in time when a fault occurs in a secondary circuit of a direct-current transformer, how to quickly and accurately find which section of the secondary circuit has the fault, and the fault position can be quickly and accurately found without a large amount of data calculation, and meanwhile, the time can be saved and the working efficiency of fault diagnosis can be improved.
The invention is realized by the following technical scheme:
in a first aspect, the present application provides a fault diagnosis method for a remote module and a merging unit, the method comprising:
acquiring a voltage signal, wherein the voltage signal is transmitted to an analog quantity voltage for generation after being transmitted by a sensor for one time;
acquiring an Ethernet signal, and performing data protocol conversion on the acquired voltage signal by a remote module to obtain the Ethernet signal;
calculating the difference between the voltage signal and the Ethernet signal;
if the difference is smaller than or equal to the first threshold, the fault diagnosis result of the remote module is normal;
and if the difference value is larger than the first threshold value, the fault diagnosis result of the remote module is abnormal.
Further, if the fault diagnosis result of the remote module is normal, performing difference calculation on two adjacent signals in the ethernet signals, taking an absolute value, and selecting the maximum value to perform judgment;
if the maximum value is smaller than or equal to a second threshold value, the fault diagnosis result of the Ethernet signal is normal;
and if the maximum value is larger than a second threshold value, the fault diagnosis result of the Ethernet signal is abnormal.
Further, if the fault diagnosis result of the ethernet signal is normal, the ethernet signal is transmitted to a merging unit through an optical fiber, and the merging unit receives data and performs multi-path synchronous data processing to obtain a merging unit output signal;
calculating the difference between the voltage signal and the output signal of the merging unit;
if the difference is smaller than or equal to a third threshold, the fault diagnosis result of the remote module is normal;
and if the difference value is larger than a third threshold value, the fault diagnosis result of the remote module is abnormal.
Further, if the fault diagnosis result of the remote module is normal, performing difference calculation on two adjacent signals in the signals output by the merging unit, taking an absolute value, and selecting the maximum value to perform judgment;
if the maximum value is smaller than or equal to a fourth threshold value, the fault diagnosis result of the output signal of the merging unit is normal;
and if the maximum value is larger than a fourth threshold value, the fault diagnosis result of the output signal of the merging unit is abnormal.
In some embodiments, the remote module runs multiple, in parallel, as: b ═ B1,b2,…,bm}; wherein m is<20。
In some embodiments, the first threshold and the third threshold are set to 0.05-0.1%, respectively.
In some embodiments, the second threshold and the fourth threshold are calculated from the capacitance and resistance values of the remote module itself.
In a second aspect, the present application provides a fault diagnosis apparatus for a remote module and a merging unit, the apparatus comprising:
the voltage signal acquisition module is used for transmitting the voltage to the analog quantity after the primary sensor is transmitted and changed, and acquiring the voltage signal;
the protocol conversion module is used for carrying out data protocol conversion on the voltage signal acquired by the remote module to obtain an Ethernet signal;
the data analysis module is used for calculating the difference value between the Ethernet signal and the voltage signal and judging the size relation with the first threshold according to the calculated result; calculating the magnitude relation between the maximum value of the Ethernet signal difference value and the second threshold value;
a merging unit receiving module: the device comprises a merging unit, a first optical fiber and a second optical fiber, wherein the merging unit is used for transmitting an Ethernet signal to the merging unit through an optical fiber, receiving data by the merging unit, and processing multi-path synchronous data to obtain an output signal of the merging unit;
the calculation analysis module is used for calculating the difference between the output signal of the merging unit and the voltage signal, judging the size relation between the output signal of the merging unit and the third threshold according to the calculation result, and calculating the size relation between the maximum value of the difference between the output signals of the merging unit and the fourth threshold;
the state indicating module is used for giving a red light indication when the far-end module of the direct current transformer is abnormal;
and the power supply management module is used for providing electric energy.
Further, the maximum value of the ethernet signal difference in the data analysis module is to perform difference calculation on two adjacent signals in the ethernet signal, take an absolute value, and select the maximum value and the second threshold value for judgment.
Further, the maximum value of the difference between the output signals of the combining units in the calculation and analysis module is to calculate the difference between two adjacent signals in the output signals of the combining units, take the absolute value, and select the maximum value and the fourth threshold value for judgment.
The application provides a fault diagnosis method and device for a remote module and a merging unit, when fault diagnosis is carried out on the remote module and the merging unit of a direct current transformer, comparison analysis is carried out on signals received by an analog voltage sent to the remote module, if the signals are normal, the next step is operated, and overall fault troubleshooting of the remote module and the merging unit of the direct current transformer is carried out. By adopting the technical scheme, the correctness of the secondary circuit of the direct current transformer can be judged, the working efficiency is improved, and huge troubles brought to troubleshooting, power failure maintenance and the like due to the fact that the direct current transformer cannot be judged and processed in time after abnormality occurs in the field are avoided. The method and the device can judge which position has a fault and can also judge whether the digital sampling rate of the direct current transformer is correct or not and whether the acquisition precision of the far-end module and the merging unit is normal or not; according to the method and the device, a large amount of data calculation is not needed, the time is saved, and the working efficiency is improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of a fault diagnosis method for a remote module and a merging unit according to the present application;
FIG. 2 is a schematic diagram of a transmission circuit of the DC transformer of the present application;
fig. 3 is a schematic structural diagram of a fault diagnosis apparatus for a remote module and a merging unit according to the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The direct-current electronic transformer mainly comprises a voltage divider and a current divider, converts the voltage divider and the current divider into a small voltage signal of an analog quantity, collects, converts and sends the signal, is called a secondary loop, and mainly comprises a remote module, an optical fiber and a merging unit. Therefore, the fault diagnosis method and device for the remote module and the merging unit can judge the correctness of the secondary circuit of the direct-current transformer, improve the working efficiency, and avoid the problem that huge troubles such as troubleshooting, power failure maintenance and the like cannot be timely judged and processed after the abnormality occurs in the field. The technical scheme of the application is explained in detail as follows:
referring to fig. 1, a flow chart of a fault diagnosis method for a remote module and a merging unit is provided;
as can be seen from fig. 1, the present application provides a fault diagnosis method for a remote module and a merging unit, the method includes:
step S1: acquiring a voltage signal, wherein the voltage signal is transmitted to an analog quantity voltage to be generated after being transmitted by a sensor for one time, and the voltage signal is recorded as: f ═ F1,f2,…,fn}；
Step S2: acquiring an Ethernet signal, and performing data protocol conversion on the acquired voltage signal by a remote module to obtain the Ethernet signal, wherein the Ethernet signal is recorded as: s ═ S1,s2,…,sn}; generally, a plurality of remote modules of the direct current transformer run in parallel, and are recorded as: b ═ B1,b2,…,bm}; wherein m is<20, this is the configuration situation of the current DC engineering, there are20 of said remote modules are operated in parallel.
Step S3: calculating a difference between the voltage signal and the Ethernet signal, i.e. F-S ═ { F }1-s1,f2-s2,…,fn-sn}；
Step S4: the first threshold value is generally preset to be 0.05-0.1%, and if the difference value is smaller than or equal to the first threshold value, the fault diagnosis result of the remote module is normal; and if the difference value is larger than the first threshold value, the fault diagnosis result of the remote module is abnormal. The abnormity shows that the voltage signal received by the far-end module has a problem, and the far-end module needs to be detected and maintained in time, so that much time can be saved, and the working efficiency is improved.
Step S5: if the fault diagnosis result of the remote module is normal, performing difference calculation on two adjacent signals in the Ethernet signals, taking an absolute value, and selecting the maximum value to judge, namely S { | S1-s2|,|s2-s3|,…,|sn-1-snAnd finding out the maximum value in the Ethernet signal and a second threshold value for judgment. The size of the second threshold is calculated according to the remote modules with different configurations and the resistance capacitance values of the remote modules, the remote modules are mainly formed by connecting resistors and capacitors in parallel, and if a resistance element of one remote module fails, the influence value on each path can be calculated according to the calculation; firstly, calculating the normal resistance value of the far-end module as R, then calculating the resistance value Rg of a single resistor in the resistance box of the far-end module after the single resistor fails, and then carrying out ratio calculation (Rg-R)/100% to obtain the percentage, wherein the obtained percentage is the second threshold.
Step S6: if the maximum value of the Ethernet signal is smaller than or equal to a second threshold value, the fault diagnosis result of the Ethernet signal is normal; and if the maximum value of the Ethernet signal is larger than a second threshold value, the fault diagnosis result of the Ethernet signal is abnormal. When an abnormal state occurs, the Ethernet signal is indicated to have a problem, and the Ethernet signal needs to be detected and maintained in time, so that subsequent work is not influenced, the working efficiency is improved, and the direct current transformer can normally operate.
Step S7: if the fault diagnosis result of the Ethernet signal is normal, transmitting the Ethernet signal to a merging unit through an optical fiber, receiving data by the merging unit, performing multi-path synchronous data processing to obtain an output signal of the merging unit, and recording the output signal of the merging unit as: m ═ M1,m2,…,mn}。
Step S8: and performing difference calculation on the voltage signal and the output signal of the merging unit to obtain the F-M ═ F1-m1,f2-m2,…,fn-mn}。
Step S9: setting a third threshold value to be 0.05-0.1%, and if the difference value is smaller than or equal to the third threshold value, the fault diagnosis result of the remote module is normal; and if the difference value is greater than the third threshold value, the fault diagnosis result of the far-end module is abnormal, which indicates that the far-end module has a fault at the moment, and the detection is carried out in time, so that the normal operation of the direct current transformer is ensured.
Step S10: if the fault diagnosis result of the remote module is normal, performing difference calculation on two adjacent signals in the output signals of the merging unit and taking an absolute value, namely M { | M1-m2|,|m2-m3|,…,|mn-1-mnSelecting the largest value from the | for judgment;
step S11: the method for calculating the fourth threshold is the same as the method for calculating the second threshold, and the description thereof is not repeated here. If the maximum value is smaller than or equal to the fourth threshold value, the fault diagnosis result of the output signal of the merging unit is normal; and if the maximum value is larger than the fourth threshold value, the fault diagnosis result of the output signal of the merging unit is abnormal.
Referring to fig. 2, a schematic diagram of a transmission circuit of the dc transformer of the present application is shown;
as can be seen from fig. 2, taking a dc transformer based on the principle of the shunt sensor as an example, a rated secondary signal is a voltage signal of several tens of millivolts, and it is necessary to distribute and drive the voltage to convert one path of analog voltage small signal output by the shunt into a plurality of paths of analog voltage signals for output, and the signals are respectively connected to three sets of protection systems and two sets of control systems to be sampled by corresponding remote modules, where the distribution and drive of the signals and the remote modules are located in a metal box with a sealed high-voltage end. For a resistance-capacitance voltage division type direct current voltage transformer, the rated output of a primary low-voltage division arm is generally tens of volts, and the primary low-voltage division arm needs to be converted into a plurality of remote modules which can be collected in a multipath manner through secondary voltage division and driving.
The sensor is transformed into a small voltage signal after being transmitted, then an acquisition unit (a far-end module) performs analog-to-digital conversion AD (analog digital), data processing frame compression, data transmission and optical fiber transmission, a merging unit receives data, because multiple signals enter the merging unit at the same time, multiple synchronous data processing and the like are performed, and finally the signals are converted into a message in an FT3 format and are transmitted to a measurement and control protection system, wherein the FT3 actually refers to a transmission frame format of a link layer and is a frame format specified in the IEC60044-8 electronic current transformer standard.
The absolute delay time refers to the time when the analog quantity on the primary side of the direct current electronic transformer has a certain quantity value, the time when the output port of the merging unit of the direct current transformer sends out the digital sampling value corresponding to the analog quantity, and the interval time between the two times. The time is the objective time for the electronic transformer to transmit the information of the primary side electric quantity to the consumption of the spacer layer control protection equipment.
According to the fault diagnosis method for the remote module and the merging unit, the transmission loop of the direct current transformer is detected section by section, the fault position can be found quickly, the correctness of the fault position is judged, and whether the fault diagnosis result is displayed abnormally or not is judged, so that the working efficiency can be improved, and a large amount of data processing is not needed. The trouble that troubleshooting, power failure maintenance and the like are brought by incapability of timely distinguishing and processing after the abnormity occurs on site is avoided.
Fig. 3 is a schematic structural diagram of a fault diagnosis apparatus for a remote module and a merging unit according to the present application;
as can be seen from fig. 3, the present application also provides a fault diagnosis apparatus for remote modules and merging units, the apparatus including:
and the power management module 11 is used for providing electric energy for the fault diagnosis device for the remote module and the merging unit.
And the voltage signal acquisition module 12 is configured to transmit the voltage signal to the analog quantity after the primary sensor is transmitted, and acquire the voltage signal, where the voltage signal is recorded as: f ═ F1,f2,…,fn}；
A protocol conversion module 13, configured to perform data protocol conversion on the voltage signal obtained by the obtaining module 12 by a remote module to obtain an ethernet signal, where the ethernet signal is recorded as: s ═ S1,s2,…sn}; generally, a plurality of remote modules of the direct current transformer run in parallel, and are recorded as: b ═ B1,b2,…,bm}; wherein m is<20, which is the configuration situation of the current direct current engineering, and 20 remote modules run in parallel.
A data analysis module 14, configured to perform difference calculation between the ethernet signal of the protocol conversion module 12 and the voltage signal of the acquisition module 12, that is, F-S ═ F1-s1,f2-s2,…,fn-sn}; and judging the size relation with the first threshold value according to the calculated result. Calculating a magnitude relationship between the maximum value of the ethernet signal difference and the second threshold, where the maximum value of the ethernet signal difference in the data analysis module 14 is to perform difference calculation on two adjacent signals in the ethernet signal and take an absolute value, that is, S { | S1-s2|,|s2-s3|,…,|sn-1-snAnd selecting the maximum value and the second threshold value for judgment.
The first threshold value is generally preset to be 0.05-0.1%, and if the difference value is smaller than or equal to the first threshold value, the fault diagnosis result of the remote module is normal; and if the difference value is larger than the first threshold value, the fault diagnosis result of the remote module is abnormal. The abnormity shows that the voltage signal received by the far-end module has a problem, the far-end module needs to be detected in time, and the detection efficiency of a transmission loop of the direct current transformer is improved.
Merging unit receiving module 15: the merging unit is configured to transmit the ethernet signal of the protocol conversion module 13 to the merging unit through an optical fiber, where the merging unit receives data and performs multi-path synchronous data processing to obtain a merging unit output signal, where the merging unit output signal is recorded as: m ═ M1,m2,…,mn}。
A calculation and analysis module 16, configured to perform difference calculation between the merging unit output signal of the merging unit receiving module 15 and the voltage signal of the obtaining module 12, that is, F-M ═ F1-m1,f2-m2,…,fn-mnAnd judging the size relationship with a third threshold according to the calculation result, wherein the third threshold is generally set to be 0.05-0.1%. Calculating a magnitude relationship between a maximum value of the difference between the output signals of the combining units and the fourth threshold, where the maximum value of the difference between the output signals of the combining units in the calculation and analysis module 16 is to calculate a difference between two adjacent signals in the output signals of the combining units in the combining unit receiving module 15 and take an absolute value, that is, M { | M1-m2|,|m2-m3|,…,|mn-1-mnAnd selecting the largest value from the values and the fourth threshold value for judgment. The method of calculating the fourth threshold is the same as the method of calculating the second threshold, and a description thereof will not be repeated.
A status indication module 17, which gives a red light indication when the far-end module of the dc transformer, the ethernet signal and the output signal of the merging unit are abnormal; if there is no problem in the entire transmission loop fault diagnosis process, the status indication module 17 does not display any information.
The application provides a fault diagnosis method and device for a remote module and a merging unit, when fault diagnosis is carried out on the remote module and the merging unit of a direct current transformer, comparison analysis is carried out on signals received by an analog voltage sent to the remote module, if the signals are normal, the next step is operated, and overall fault troubleshooting of the remote module and the merging unit of the direct current transformer is carried out. By adopting the technical scheme, the correctness of the secondary circuit of the direct current transformer can be judged, the working efficiency is improved, and huge troubles brought to troubleshooting, power failure maintenance and the like due to the fact that the direct current transformer cannot be judged and processed in time after abnormality occurs in the field are avoided. The method and the device can judge which position has a fault and can also judge whether the digital sampling rate of the direct current transformer is correct or not and whether the acquisition precision of the far-end module and the merging unit is normal or not; according to the method and the device, a large amount of data calculation is not needed, the time is saved, and the working efficiency is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for fault diagnosis of a remote module and merging unit, the method comprising:
acquiring a voltage signal, wherein the voltage signal is transmitted to an analog quantity voltage for generation after being transmitted by a sensor for one time;
acquiring an Ethernet signal, and performing data protocol conversion on the voltage signal by a remote module to obtain the Ethernet signal;
calculating the difference between the voltage signal and the Ethernet signal;
if the difference is smaller than or equal to the first threshold, the fault diagnosis result of the remote module is normal;
and if the difference value is larger than the first threshold value, the fault diagnosis result of the remote module is abnormal.
2. The method according to claim 1, wherein if the fault diagnosis result of the remote module is normal, the difference between two adjacent signals in the ethernet signals is calculated, and an absolute value is taken, and the largest value is selected for judgment;
if the maximum value is smaller than or equal to a second threshold value, the fault diagnosis result of the Ethernet signal is normal;
and if the maximum value is larger than a second threshold value, the fault diagnosis result of the Ethernet signal is abnormal.
3. The method according to claim 2, wherein if the fault diagnosis result of the ethernet signal is normal, the ethernet signal is transmitted to the merging unit through an optical fiber, and the merging unit receives data and performs multi-path synchronous data processing to obtain a merging unit output signal;
calculating the difference between the voltage signal and the output signal of the merging unit;
if the difference is smaller than or equal to a third threshold, the fault diagnosis result of the remote module is normal;
and if the difference value is larger than a third threshold value, the fault diagnosis result of the remote module is abnormal.
4. The method according to claim 3, wherein if the fault diagnosis result of the remote module is normal, the difference between two adjacent signals in the output signals of the merging unit is calculated, the absolute value is taken, and the maximum value is selected for judgment;
if the maximum value is smaller than or equal to a fourth threshold value, the fault diagnosis result of the output signal of the merging unit is normal;
and if the maximum value is larger than a fourth threshold value, the fault diagnosis result of the output signal of the merging unit is abnormal.
5. The method of claim 1, wherein the remote modules run in parallel a plurality of functions, denoted as: b ═ B1,b2,…,bm}; wherein m is<20。
6. The method of claim 1, wherein the first threshold and the third threshold are set to 0.05-0.1% respectively.
7. The method according to claim 1, wherein the second threshold and the fourth threshold are calculated from the capacitance and resistance values of the remote module itself.
8. A fault diagnosis apparatus for a remote module and merging unit, the apparatus comprising:
the voltage signal acquisition module is used for transmitting the voltage to the analog quantity after the primary sensor is transmitted and changed, and acquiring the voltage signal;
the protocol conversion module is used for carrying out data protocol conversion on the voltage signal acquired by the remote module to obtain an Ethernet signal;
the data analysis module is used for calculating the difference value between the Ethernet signal and the voltage signal and judging the size relation with the first threshold according to the calculated result; calculating the magnitude relation between the maximum value of the Ethernet signal difference value and the second threshold value;
a merging unit receiving module: the device comprises a merging unit, a first optical fiber and a second optical fiber, wherein the merging unit is used for transmitting an Ethernet signal to the merging unit through an optical fiber, receiving data by the merging unit, and processing multi-path synchronous data to obtain an output signal of the merging unit;
the calculation analysis module is used for calculating the difference between the output signal of the merging unit and the voltage signal, judging the size relation between the output signal of the merging unit and the third threshold according to the calculation result, and calculating the size relation between the maximum value of the difference between the output signals of the merging unit and the fourth threshold;
the state indicating module is used for giving a red light indication when the far-end module of the direct current transformer is abnormal;
and the power supply management module is used for providing electric energy.
9. The apparatus of claim 8, wherein the maximum value of the difference between the ethernet signals in the data analysis module is obtained by calculating the difference between two adjacent ethernet signals and taking the absolute value, and selecting the maximum value and the second threshold value for judgment.
10. The apparatus according to claim 8, wherein the maximum value of the difference between the output signals of the combining units in the calculation and analysis module is obtained by calculating the difference between two adjacent signals in the output signals of the combining units and taking the absolute value, and selecting the maximum value and the fourth threshold value for judgment.
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