A gauge on-line monitoring system

Abstract

The application discloses a kind of measuring device online monitoring system, comprising: voltage transformer online monitoring device, merging unit, data processing device and online monitoring background;Online monitoring background is used to real-time display received first measurement data, second measurement data and third measurement data;The upper and lower limits of alarm and the upper and lower limits of fault of first measurement data, second measurement data and third measurement data are set respectively, and the received first measurement data, second measurement data and third measurement data are judged alarm or fault respectively;When any measurement data is judged as fault, then according to the data between the preset redundancy system, fault type is judged, and according to the change condition of the measurement data judged as fault, the relevance of the state of the measurement device corresponding to the measurement data judged as fault and fault type is obtained, to generate standardized message.The application solves the technical problem that the state information of measuring device cannot be monitored in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical equipment monitoring, in particular to a measurement device online monitoring system. BACKGROUND

[0002] The DC converter station AC-DC control protection system needs to collect the current and voltage information of each corresponding measuring point of the converter station, so corresponding current and voltage transformers need to be configured at each measuring point. However, due to the presence of DC components, the conventional AC current and voltage transformers cannot meet the demand of measuring DC current and voltage, and need to be replaced by electronic current transformers, electronic voltage transformers and pure optical current transformers. The various types of current and voltage transformers in the station are collectively referred to as current and voltage measurement devices.

[0003] Currently, there is no corresponding technical means for effectively monitoring the operating state of measurement devices such as electronic current transformers, electronic voltage transformers and pure optical current transformers in the DC converter station. The operating personnel can only observe the actual measurement values of the measuring points where the measurement devices are located in the operation background, and cannot perceive the information related to the state of the measurement devices themselves, such as measurement device laser drive current, laser temperature, remote module temperature, SF6 pressure, light intensity level, optical path temperature, light source temperature, etc. This may cause the measurement devices to be in an unhealthy operating state for a long time until they are damaged, and the defects cannot be timely eliminated, which may cause damage to the equipment and even DC outage accidents.

[0004] Therefore, it is urgent to realize real-time and effective monitoring of the corresponding state quantities of measurement devices, so as to improve the intelligent operation and maintenance level of key equipment in the DC converter station. SUMMARY

[0005] The present application provides a measurement device online monitoring system to solve the technical problem that the state information of the measurement device cannot be monitored in the prior art.

[0006] In order to solve the above technical problems, the present application provides a measurement device online monitoring system, comprising: a voltage transformer online monitoring device, a merging unit, a data processing device and an online monitoring background;

[0007] The voltage transformer online monitoring device is used for real-time monitoring and acquiring first measurement data of sulfur hexafluoride gas in the electronic voltage transformer, and uploading the first measurement data to the online monitoring background;

[0008] The merging unit is used for real-time monitoring and acquiring second measurement data of the electronic transformer and third measurement data of the pure optical current transformer respectively, and sending the second measurement data and the third measurement data to the data processing device and the online monitoring background respectively;

[0009] The data processing device is used for calculating the effective values of the received second measurement data and third measurement data, and uploading the effective values of the second measurement data and the third measurement data to an online monitoring background through telemetry respectively;

[0010] The online monitoring background is used for displaying the received first measurement data, second measurement data and third measurement data in real time through a graphical interface, setting the upper and lower limits of alarm and the upper and lower limits of fault of the first measurement data, second measurement data and third measurement data respectively, and judging the received first measurement data, second measurement data and third measurement data respectively, when any measurement data is judged as fault, judging the fault type according to the data between the preset redundant systems, and obtaining the relevance between the state and fault type of the measurement device corresponding to the measurement data judged as fault according to the change of the measurement data judged as fault, so as to generate a standardized message; wherein, the fault type includes converter station system fault and measurement device fault.

[0011] It can be understood that, compared with the prior art, the present application can monitor the sulfur hexafluoride gas in the electronic voltage transformer, the electronic transformer and the pure optical current transformer through the voltage transformer online monitoring device and the merging unit, obtain the related first measurement data, second measurement data and third measurement data, and upload them to the data processing device and the online monitoring background, so as to judge the alarm or fault according to the measured data, further to achieve abnormal alarm of the overall system, and to judge whether the converter station system is faulty or the measurement device is faulty through the data between the preset redundant systems, to be able to judge the relevance of the fault type according to the change of the measurement data, and to generate the corresponding standardized message, so that the converter station staff can intuitively and quickly handle the fault, the converter station equipment can be repaired in advance, the long-term healthy operation of the measurement device is ensured, and the power outage accident is reduced.

[0012] As a preferred scheme, the first measurement data includes the pressure and temperature of the sulfur hexafluoride gas.

[0013] The alarm or fault judgment on the received first measurement data is specifically: according to the pressure of the sulfur hexafluoride gas, recording the change trend of the pressure of the sulfur hexafluoride gas, and according to the upper and lower limits of the fault and the upper and lower limits of the alarm of the pressure of the sulfur hexafluoride gas, judging the sealing of the electronic voltage transformer, so as to display the normal signal, the alarm signal or the fault signal of the pressure of the sulfur hexafluoride gas and the pressure data of the sulfur hexafluoride gas in the graphical interface in real time; according to the temperature of the sulfur hexafluoride gas, recording the change trend of the temperature of the sulfur hexafluoride gas, and according to the upper and lower limits of the fault and the upper and lower limits of the alarm of the temperature of the sulfur hexafluoride gas, obtaining the temperature condition of the sulfur hexafluoride gas, so as to display the normal signal, the alarm signal or the fault signal of the temperature of the sulfur hexafluoride gas and the temperature data of the sulfur hexafluoride gas in the graphical interface in real time.

[0014] It can be understood that the present application can alarm and judge the pressure and temperature of the sulfur hexafluoride gas in the electronic voltage transformer, and accurately judge the pressure and temperature of the sulfur hexafluoride gas through the upper and lower limits of the fault and the upper and lower limits of the alarm of the pressure of the sulfur hexafluoride gas and the upper and lower limits of the fault and the upper and lower limits of the alarm of the temperature of the sulfur hexafluoride gas, and display the data of the pressure and temperature of the sulfur hexafluoride gas on the graphical interface, which can intuitively show the change trend of the pressure and temperature of the sulfur hexafluoride gas, and improve the control of the operation of the electronic voltage transformer by the staff of the converter station.

[0015] As a preferred solution, the second measurement data includes: the temperature of the laser, the driving current, and the temperature of the remote module; the electronic transformer includes an electronic current transformer and an electronic voltage transformer;

[0016] The alarm or fault judgment on the received second measurement data is specifically: according to the temperature of the laser, the driving current, respectively recording the change trend of the temperature of the laser and the driving current, and according to the upper and lower limits of the fault and the upper and lower limits of the alarm of the temperature of the laser and the upper and lower limits of the fault and the upper and lower limits of the alarm of the driving current, respectively obtaining the temperature and driving current of the laser, respectively displaying the normal signal, the alarm signal or the fault signal of the temperature of the laser, the normal signal, the alarm signal or the fault signal of the driving current, and the temperature data and the driving current data of the laser in the graphical interface in real time.

[0017] According to the temperature of the remote module, a change trend of the temperature of the remote module is recorded, and according to the fault upper and lower limits and the alarm upper and lower limits of the temperature of the remote module, the temperature condition of the remote module is obtained, so that the normal signal, the alarm signal or the fault signal of the temperature of the remote module and the temperature data of the remote module are displayed in real time in the graphical interface; wherein, the electronic current transformer and the electronic voltage transformer both comprise the remote module and the laser.

[0018] It can be understood that the application can alarm and judge the fault of the temperature, the driving current of the laser and the temperature of the remote module in the electronic transformer, and accurately judge the abnormality and the fault of the electronic transformer through the fault upper and lower limits and the alarm upper and lower limits of the temperature, the driving current of the laser and the temperature of the remote module, and display the data of the temperature, the driving current of the laser and the temperature of the remote module on the graphical interface, so that the change trend of the measurement data can be intuitively displayed, the accuracy of the operation of the electronic transformer is improved, and the processing efficiency of the fault accident of the converter station is further improved.

[0019] As a preferred solution, the third measurement data comprises light intensity, light source driving current, light path temperature and half-wave voltage.

[0020] The alarm or fault judgment on the received third measurement data is specifically: according to the light intensity, the light source driving current, the light path temperature and the half-wave voltage, the change trends of the light intensity, the light source driving current, the light path temperature and the half-wave voltage are recorded respectively, and according to the fault upper and lower limits and the alarm upper and lower limits of the light intensity, the light source driving current, the light path temperature and the half-wave voltage respectively, the conditions of the light intensity, the light source driving current, the light path temperature and the half-wave voltage are obtained respectively, so that the normal signal, the alarm signal or the fault signal of the light intensity, the light source driving current, the light path temperature and the half-wave voltage and the light intensity, the light source driving current, the light path temperature and the half-wave voltage data are displayed in real time in the graphical interface respectively.

[0021] It can be understood that the application can alarm and judge the fault of the light intensity, the light source driving current, the light path temperature and the half-wave voltage in the pure optical current transformer, and accurately judge the abnormality and the fault through the fault upper and lower limits and the alarm upper and lower limits of the light intensity, the light source driving current, the light path temperature and the half-wave voltage, and display the obtained measurement data on the graphical interface, so that the change trend of the measurement data can be intuitively displayed, the operation of the pure optical current transformer is improved, and the processing efficiency of the fault accident is further improved.

[0022] As a preferred solution, the data server is further configured to store the received first measurement data, second measurement data and third measurement data.

[0023] It can be understood that the data server is responsible for monitoring the collection, storage and analysis of data, realizing the storage and calling of historical data corresponding to the first measurement data, second measurement data and third measurement data, ensuring the reliable and safe data, and having strong data storage and reading ability, fast response to data analysis and calling requirements.

[0024] As a preferred solution, the online monitoring background is further configured to call the stored first measurement data, second measurement data and third measurement data, and display the first measurement data, second measurement data and third measurement data respectively by using curves, pie charts or column charts.

[0025] According to the preset data model, the first measurement data, the second measurement data and the third measurement data are respectively judged for fault type, and the state and fault type of the measuring device corresponding to the measurement data judged as fault are analogized and associated according to the change of the measurement data judged as fault, so as to prewarn the measuring device.

[0026] It can be understood that the first measurement data, the second measurement data and the third measurement data are called and displayed by using curves, pie charts, column charts and other ways to show the change trend and data distribution of the data, which intuitively shows the change of the data, so that the staff can understand the running condition of the measuring device from multiple aspects, and according to the preset data model, the first measurement data, the second measurement data and the third measurement data are judged for fault type, which further improves the accuracy and efficiency, so that the state and fault type of the measuring device can be analogized and associated, so as to prewarn the measured measuring device, and further improve the running safety of the converter station.

[0027] As a preferred solution, the online monitoring background is further configured to display the equipment model, parameter, running time and fault frequency and fault reason of each single measuring device.

[0028] It can be understood that the online monitoring background of the present application can also display the model, parameter, running time and fault frequency and fault reason of each single measuring device, so that the converter station staff can clearly and conveniently obtain the measuring device and its running condition to be viewed, and the converter station staff can carry out related work, and the running efficiency is improved.

[0029] As a preferred scheme, the voltage transformer online monitoring device uploads the first measurement data to the online monitoring background through IEC61850 protocol.

[0030] The merging units upload the second measurement data and the third measurement data to the online monitoring background through IEC61850 protocol.

[0031] The merging units upload the second measurement data and the third measurement data to the data processing device through IEC60044-8 protocol.

[0032] The data processing device uploads the effective values of the second measurement data and the third measurement data to the online monitoring background through IEC61850 protocol.

[0033] It can be understood that the voltage transformer online monitoring device uploads through IEC61850 protocol, and the merging units respectively use IEC61850 protocol and IEC60044-8 protocol, which can avoid information disorder caused by massive measurement data, and IEC61850 protocol has the characteristics of real-time service and data self-description, which can simplify the management and maintenance of the measurement data uploaded by the voltage transformer and the merging unit in the online monitoring background, and IEC60044-8 protocol is suitable for optical fiber communication, which improves the efficiency of the merging unit sending measurement data to the data processing device.

[0034] As a preferred scheme, the calculation of the effective values of the received second measurement data and the third measurement data is specifically:

[0035] The three-phase interflow in the received second measurement data and the third measurement data is calculated by zero sequence or negative sequence, and then it is verified whether the three phases are symmetrical.

[0036] It can be understood that the three-phase interflow in the received second measurement data and the third measurement data is calculated by zero sequence or negative sequence, which can accurately obtain whether the three phases in the measurement device are symmetrical, and then determine whether a fault or an abnormal line occurs in the measurement device, and further improve the accuracy of fault diagnosis. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 : a DC measurement point monitoring scheme in a direct current converter station in the prior art;

[0038] Figure 2 : a schematic diagram of a measurement device online monitoring system provided by an embodiment of the present application;

[0039] Figure 3A signal connection schematic diagram of an electronic current transformer in a measuring device online monitoring system provided by the embodiment of the present application;

[0040] Figure 4 A signal connection schematic diagram of an electronic voltage transformer in a measuring device online monitoring system provided by the embodiment of the present application;

[0041] Figure 5 A signal connection schematic diagram of a pure optical current transformer in a measuring device online monitoring system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0043] Please refer to Figure 1 which is a main AC / DC measurement point scheme of a current DC converter station, wherein IS, IVT and IDZ are conventional AC current transformers, US, UVT and UV are conventional AC voltage transformers, IDNY, IACZ, IVC, IDP and IDN are electronic current transformers, UDP and UDN are electronic voltage transformers, and IVR, IBP and IBN are pure optical current transformers.

[0044] Embodiment one

[0045] Please refer to Figure 2 The online monitoring system of the measuring device provided by the embodiment of the present application comprises a voltage transformer online monitoring device 002, a merging unit 003, a data processing device 004 and an online monitoring background 001.

[0046] The voltage transformer online monitoring device 002 is used for monitoring and acquiring first measurement data of sulfur hexafluoride gas in an electronic voltage transformer in real time, and uploading the first measurement data to the online monitoring background.

[0047] The merging unit 003 is used for monitoring and acquiring second measurement data of an electronic transformer and third measurement data of a pure optical current transformer in real time, respectively, and sending the second measurement data and the third measurement data to the data processing device 004 and the online monitoring background 001, respectively.

[0048] The data processing device 004 is configured to calculate the effective values of the received second measurement data and third measurement data, and upload the effective values of the second measurement data and the third measurement data to the online monitoring background through telemetry.

[0049] The online monitoring background 001 is configured to display the received first measurement data, second measurement data and third measurement data in real time through a graphical interface, set the upper and lower limits of the alarm and the upper and lower limits of the fault of the first measurement data, the second measurement data and the third measurement data, and perform alarm or fault judgment on the received first measurement data, second measurement data and third measurement data, respectively. When any measurement data is judged to be faulty, the fault type is judged according to the preset data between the redundant systems, and the relevance between the state of the measurement device corresponding to the measurement data judged to be faulty and the fault type is obtained according to the change of the measurement data judged to be faulty, so as to generate a standardized message. The fault type includes converter station system fault and measurement device fault.

[0050] It should be noted that, as a preferred scheme of the embodiment, the preset redundant system is the same measurement device online monitoring system applied in the same converter station. Preferably, the average value of the measurement data of the three redundant measurement devices is calculated, and the difference between each set of measurement data and the obtained average value is calculated. If the difference exceeds the threshold value (preferably, the threshold value can be set to 5% of the current effective value or 2% of the rated value), it is judged that the measurement data of this set is abnormal. Then, the converter station staff can check the measurement device with abnormal data, so as to judge whether the fault is caused by the converter station system or the measurement device. Then, the online monitoring background 001 can obtain the relevance between the state of the measurement device corresponding to the measurement data judged to be faulty and the fault type according to the change of the measurement data judged to be faulty (i.e. all the historical data of the measurement device corresponding to the measurement data stored in the data server), and generate a related standardized message. The standardized message includes the basic information, operating state and fault type of each measurement device in the converter station when a fault occurs, and the measurement data of the measurement device with a fault within a period of time.

[0051] As a preferred solution, the first measurement data includes: the pressure and temperature of sulfur hexafluoride gas; the alarm or fault judgment on the received first measurement data, specifically: according to the pressure of sulfur hexafluoride gas, record the change trend of the pressure of sulfur hexafluoride gas, and according to the upper and lower limits of the fault and the upper and lower limits of the alarm of the pressure of sulfur hexafluoride gas, judge the sealing performance of the electronic voltage transformer, so as to display the normal signal, alarm signal or fault signal of the pressure of sulfur hexafluoride gas and the pressure data of sulfur hexafluoride gas in the graphical interface in real time; according to the temperature of sulfur hexafluoride gas, record the change trend of the temperature of sulfur hexafluoride gas, and according to the upper and lower limits of the fault and the upper and lower limits of the alarm of the temperature of sulfur hexafluoride gas, obtain the temperature condition of sulfur hexafluoride gas, so as to display the normal signal, alarm signal or fault signal of the temperature of sulfur hexafluoride gas and the temperature data of sulfur hexafluoride gas in the graphical interface in real time.

[0052] It should be noted that since the electronic voltage transformer is a sulfur hexafluoride device, it is also necessary to increase the monitoring of sulfur hexafluoride gas pressure and temperature data, and the data is sent to the online monitoring background 001 through the voltage transformer online monitoring device 002; further, according to the upper and lower limits of the alarm of the pressure of sulfur hexafluoride gas, it is judged whether the current sulfur hexafluoride gas pressure is within the upper and lower limits of the alarm, if yes, it means that the sealing performance of the electronic voltage transformer is good; if not, it means that the sealing performance of the electronic voltage transformer is poor, and the electronic voltage transformer needs to be checked; similarly, when the pressure of sulfur hexafluoride gas is outside the upper and lower limits of the alarm, it means that the electronic voltage transformer has failed, and accordingly a fault signal is generated in the graphical interface.

[0053] Preferably, as a preferred solution of the present embodiment, the upper and lower limits of the alarm of the pressure of sulfur hexafluoride gas are set to 0.33-0.42 MPa, the difference between the maximum and minimum values of the recorded data of a single sulfur hexafluoride device within an analysis period does not exceed 0.05 MPa; the difference between the maximum and minimum values of the same value of the same type of device recorded at the same time point does not exceed 0.1 MPa; the difference between the maximum and minimum values of the change slope of the data recorded by the same device within an analysis period does not exceed 0.05 MPa / recorded time interval; the difference between the maximum and minimum values of the change slope of the same value of the same type of device at the same time point does not exceed 0.05 MPa / recorded time interval; preferably, one analysis period is one week or one month.

[0054] Similarly, preferably, the upper and lower limits of the fault of the pressure of sulfur hexafluoride gas can be determined according to the actual situation, and the upper and lower limits of the alarm and the fault of the temperature of sulfur hexafluoride gas can also be determined according to the actual situation, which will not be described here.

[0055] It can be understood that the present application can alarm and judge the pressure and temperature of the sulfur hexafluoride gas in the electronic voltage transformer, and can accurately judge the pressure and temperature of the sulfur hexafluoride gas through the fault upper and lower limits and the alarm upper and lower limits of the pressure of the sulfur hexafluoride gas, and the fault upper and lower limits and the alarm upper and lower limits of the temperature of the sulfur hexafluoride gas, and display the data of the pressure and temperature of the sulfur hexafluoride gas on the graphical interface, and can intuitively show the change trend of the pressure and temperature of the sulfur hexafluoride gas, and improve the control of the operation of the electronic voltage transformer by the converter station staff.

[0056] As a preferred solution, the second measurement data includes: temperature of the laser, driving current, and temperature of the remote module; and the electronic transformer includes an electronic current transformer and an electronic voltage transformer.

[0057] The alarm or fault judgment on the received second measurement data is specifically: according to the temperature of the laser and the driving current, the change trend of the temperature of the laser and the driving current is recorded respectively, and according to the fault upper and lower limits and the alarm upper and lower limits of the temperature of the laser and the driving current, the temperature of the laser and the driving current are obtained respectively, the normal signal, the alarm signal or the fault signal of the temperature of the laser, the normal signal, the alarm signal or the fault signal of the driving current, and the temperature data of the laser and the driving current are displayed in the graphical interface in real time; according to the temperature of the remote module, the change trend of the temperature of the remote module is recorded, and according to the fault upper and lower limits and the alarm upper and lower limits of the temperature of the remote module, the temperature of the remote module is obtained, so that the normal signal, the alarm signal or the fault signal of the temperature of the remote module and the temperature data of the remote module are displayed in the graphical interface in real time; wherein the electronic current transformer and the electronic voltage transformer both include the remote module and the laser.

[0058] It should be noted that please refer to Figure 3 and 4 , the electronic current transformer and the electronic voltage transformer both include the remote module, and the remote module needs to send the measurement data to the merging unit 003 through the multi-mode optical fiber, so the laser in the merging unit 003 needs to supply power to the remote module, so that the remote module sends the sampled measurement data to the merging unit 003, and then sends the measurement data to the online monitoring background 001 and the data processing device 004; wherein, the B set merging unit and the C set merging unit shown in the figure are redundant systems of the A set merging unit.

[0059] As a preferred scheme of the embodiment, the upper limit value of the temperature alarm of the laser is set to 50 DEG C, and the lower limit value can be set according to actual requirements; if the temperature of the laser increases by 4 DEG C for two consecutive days, the laser is abnormal, and an alarm signal is sent; if the temperature of the laser fluctuates within 8 DEG C for 30 days and does not show an increasing trend, it is normal; if the lowest temperature and the highest temperature of the laser change within 8 DEG C for 30 days and show an increasing trend, the laser can be abnormal, and an alarm signal is sent. Similarly, the upper and lower limit data of the temperature fault of the laser can also be set according to actual conditions.

[0060] As a preferred scheme of the embodiment, the upper limit value of the drive current alarm of the laser is set to 1100 mA, and the lower limit value can be set according to actual requirements; if the drive current of the laser increases by 50 mA for two consecutive days, the laser or the energy fiber is abnormal; if the drive current of the laser fluctuates within 100 mA for 30 days and does not show an increasing trend, it is normal; if the lowest drive current and the highest drive current of the laser change within 100 mA for 30 days and show an increasing trend, the laser or the energy fiber can be abnormal. Similarly, the upper and lower limit data of the drive current fault of the laser can also be set according to actual conditions.

[0061] As a preferred scheme of the embodiment, the upper limit value of the temperature of the remote module is set to 80 DEG C, and the lower limit value can be set according to actual requirements; if the temperature of the remote module increases by 6 DEG C for two consecutive days, the remote module is abnormal; if the temperature of the remote module fluctuates within 16 DEG C for 30 days and does not show an increasing trend, it is normal; if the lowest temperature and the highest temperature of the remote module change within 16 DEG C for 30 days and show an increasing trend, the remote module can be abnormal. Similarly, the upper and lower limit data of the temperature fault of the remote module can also be set according to actual conditions.

[0062] It can be understood that the application can alarm and judge the temperature, drive current of the laser and the temperature of the remote module in the electronic transformer, and accurately judge the abnormality and fault of the electronic transformer through the fault upper and lower limits and alarm upper and lower limits of the temperature and drive current of the laser and the fault upper and lower limits and alarm upper and lower limits of the temperature of the remote module, and display the data of the temperature, drive current of the laser and the temperature of the remote module on the graphical interface, so that the change trend of the measurement data can be intuitively presented, the accuracy of the operation of the electronic transformer by the staff of the converter station is improved, and the processing efficiency of the fault accidents of the converter station is further improved.

[0063] As a preferred scheme, the third measurement data includes light intensity, light source drive current, light path temperature and half-wave voltage.

[0064] The alarm or fault judgment on the received third measurement data is specifically: according to the light intensity, light source driving current, light path temperature and half-wave voltage, the change trend of the light intensity, light source driving current, light path temperature and half-wave voltage is recorded respectively, and the light intensity, light source driving current, light path temperature and half-wave voltage are obtained respectively according to the fault upper and lower limits and the alarm upper and lower limits of the light intensity, light source driving current, light path temperature and half-wave voltage, so that the normal signal, alarm signal or fault signal of the light intensity, light source driving current, light path temperature and half-wave voltage and the light intensity, light source driving current, light path temperature and half-wave voltage data are displayed in the graphical interface in real time.

[0065] It should be noted that, please refer to Figure 5 which is a signal acquisition connection diagram of a pure optical current transformer. After the measurement data is collected by each acquisition unit, it is sent to the corresponding merging unit 003. Exemplarily, the B set merging unit and the C set merging unit shown in the figure are redundant systems of the A set merging unit.

[0066] As a preferred scheme of the embodiment, the upper limit of the absolute value of the light intensity level is set to 700 mV, and the lower limit value can be set according to actual needs; when the absolute value is greater than 500 mV during normal operation, attention is needed, and it is recommended to handle during power-off maintenance; if the average daily decrease is more than 2 mV / day for 30 consecutive days, the light path or the light source is abnormal; similarly, the fault upper and lower limit data of the light intensity can also be set according to actual conditions.

[0067] As a preferred scheme of the embodiment, the normal operation driving current interval of the light source is 1-150 mA, and an alarm is given when it exceeds 150 mA; light source adjustment margin calculation is performed; if the light source driving current changes by more than 10 mA for 2 consecutive days, it is judged that the acquisition unit is abnormal; similarly, the fault upper and lower limit data of the light source driving current can also be set according to actual conditions.

[0068] As a preferred scheme of the embodiment, the upper limit temperature of the light path temperature and the light source temperature is set to 60℃, and attention should be paid when the temperature exceeds 60℃, and it is recommended to check, and the lower limit temperature can be set according to actual needs. Similarly, the fault upper and lower limit data of the light path temperature and the light source temperature can also be set according to actual conditions.

[0069] It should be noted that the half-wave voltage of the pure optical current transformer is measured by monitoring the voltage value of the modulator. As a preferred scheme of the embodiment, the voltage value of the modulator when modulated to π / 2 is 1-9 V in the normal working range, and an alarm signal of half-wave voltage out-of-limit is given when it exceeds. Similarly, the fault upper and lower limit data of the half-wave voltage can also be set according to actual conditions.

[0070] It can be understood that the present application can alarm and judge faults by the light intensity, light source driving current, optical path temperature and half-wave voltage in the pure optical current transformer, and through the fault upper and lower limits and alarm upper and lower limits of the light intensity, light source driving current, optical path temperature and half-wave voltage, the fault abnormality can be accurately judged, and the obtained measurement data can be displayed on the graphical interface, the change trend of the measurement data can be intuitively presented, the operation of the pure optical current transformer is controlled by the converter station staff, and the processing efficiency of the fault accident is further improved.

[0071] As a preferred solution, the embodiment further includes a data server 005; the data server 005 is used to store the received first measurement data, second measurement data and third measurement data.

[0072] It should be noted that preferably, the measurement data stored by the data server 005 is stored for more than 5 years, and 2 data servers 005 are configured in the entire converter station to ensure that the obtained massive measurement data can be used for prediction and early warning of data change trend in the online monitoring background 001.

[0073] It can be understood that the data server 005 is responsible for monitoring data collection, storage and analysis, realizes storage and calling of historical data corresponding to the first measurement data, the second measurement data and the third measurement data, ensures the reliability and safety of the data, and has strong data storage and reading ability, and quickly responds to the demand of data analysis and calling.

[0074] As a preferred solution, the online monitoring background 001 is also used to call the stored first measurement data, second measurement data and third measurement data, and display the first measurement data, second measurement data and third measurement data respectively by using the curve, pie chart or column chart; according to the preset data model, the first measurement data, the second measurement data and the third measurement data are respectively judged for fault type, and the state and fault type of the measurement device corresponding to the measurement data judged as fault are analogized and associated according to the change of the measurement data judged as fault, so as to alarm the measurement device.

[0075] It should be noted that the preset data model is obtained by respectively modeling all the measurement data, so that each kind of measurement data can be judged according to the change trend of the respective data, and the state and the fault type of the measurement device corresponding to the measurement data judged as fault are compared and associated. For example, when a fault occurs, the change trend curve of the current measurement data and the change of the curve slope are recorded, so that when the measurement data is monitored again and is about to present the same change trend, the measurement device corresponding to the measurement data can be directly warned of fault.

[0076] It can be understood that the query call of the first measurement data, the second measurement data and the third measurement data is realized, and the change trend and the data distribution of the data are displayed in various ways such as curves, pie charts and column charts, which intuitively displays the change of the data, so that the staff can understand the running condition of the current measurement device from multiple aspects, and the fault type of the first measurement data, the second measurement data and the third measurement data is judged according to the preset data model, which further improves the accuracy and efficiency, so that the state and the fault type of the measurement device can be compared and associated accurately, so as to warn of fault of the monitored measurement device, and further improve the operation safety of the converter station.

[0077] As a preferred scheme, the online monitoring background 001 is further used for displaying the equipment model, parameters, running time and fault times and fault reasons of each single measurement device.

[0078] It can be understood that the online monitoring background of the present application can also display the model, parameters, running time and fault times and fault reasons of each single measurement device, so that the converter station staff can clearly and conveniently obtain the measurement device and its running condition to be viewed, and the related work of the converter station staff is facilitated, and the operation efficiency is improved.

[0079] As a preferred scheme, the voltage transformer online monitoring device 002 uploads the first measurement data to the online monitoring background 001 through IEC61850 protocol; the merging unit 003 uploads the second measurement data and the third measurement data to the online monitoring background 001 through IEC61850 protocol; the merging unit 003 uploads the second measurement data and the third measurement data to the data processing device 004 through IEC60044-8 protocol; and the data processing device 004 uploads the effective values of the second measurement data and the third measurement data to the online monitoring background 001 through IEC61850 protocol.

[0080] It can be understood that the voltage transformer online monitoring device 002 uploads the IEC61850 protocol, and the merging unit 003 uses the IEC61850 protocol and the IEC60044-8 protocol respectively, which can avoid the massive measurement data from causing information disorder. At the same time, the IEC61850 protocol has the characteristics of real-time service and data self-description, which can simplify the management and maintenance of the measurement data uploaded by the voltage transformer and the merging unit 003 in the online monitoring background 001. The IEC60044-8 protocol is suitable for optical fiber communication, which improves the efficiency of the merging unit 003 sending the measurement data to the data processing device 004.

[0081] As a preferred solution, the received second measurement data and the third measurement data are calculated for effective value, specifically: the three-phase current in the received second measurement data and the third measurement data is calculated for zero sequence or negative sequence, and then it is verified whether the three-phase is symmetrical.

[0082] It should be noted that the three-phase current includes the driving current of the laser in the second measurement data and the driving current of the light source in the third measurement data. Preferably, when performing zero sequence or negative sequence calculation, the threshold value can be set to 5% of the current effective value or 2% of the rated value.

[0083] It can be understood that the three-phase current in the received second measurement data and the third measurement data is calculated for zero sequence or negative sequence, which can accurately determine whether the three-phase in the measurement device is symmetrical, and then determine whether the line in the measurement device is faulty or abnormal, thereby further improving the accuracy of fault diagnosis.

[0084] As a preferred solution of the embodiment, it further includes a switch, and the switch sends the aggregated measurement data to the data server and the online monitoring background. According to the field demand configuration, the connection of the data link from the information acquisition device in each area of the whole station to the data server is completed. The switch network is independent of the DC control protection network and operates independently without affecting each other.

[0085] The above embodiment has the following effects:

[0086] Compared with the prior art, the application can monitor the sulfur hexafluoride gas in the electronic voltage transformer, the electronic transformer and the pure optical current transformer through the voltage transformer online monitoring device and the merging unit, and obtain the related sulfur hexafluoride gas temperature and gas pressure, the data of the laser and the remote module in the electronic transformer, the data of the pure optical current transformer and the like, and upload to the data processing device and the online monitoring background, so as to alarm or judge the fault according to the measured data, and then achieve the abnormal alarm of the overall system, and judge whether the fault is the fault of the converter station system or the fault of the measuring device according to the data between the preset redundant systems, the correlation of the fault type according to the change of the measurement data, and the generation of the corresponding standardized message, so that the converter station staff can intuitively and quickly handle the fault, the converter station equipment can be well maintained in advance, the long-term healthy operation of the measuring device is ensured, and the power outage accident is reduced.

[0087] The above specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the application, and it should be understood that the above description is only for specific embodiments of the application and is not used to limit the protection scope of the application. It is particularly pointed out that any modification, equivalent replacement, improvement and the like made by those skilled in the art within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An on-line monitoring system for a measuring device, characterized in that include: Voltage transformer online monitoring device, merging unit, data processing device and online monitoring backend; The voltage transformer online monitoring device is used to monitor and acquire the first measurement data of sulfur hexafluoride gas in the electronic voltage transformer in real time, and send the first measurement data to the online monitoring backend. The merging unit is used to monitor and acquire the second measurement data of the electronic current transformer and the third measurement data of the pure optical current transformer in real time, and send the second measurement data and the third measurement data to the data processing device and the online monitoring backend respectively; wherein, the second measurement data includes: the temperature of the laser, the driving current, and the temperature of the remote module; the third measurement data includes: light intensity, light source driving current, optical path temperature, and half-wave voltage; The data processing device is used to calculate the effective values ​​of the received second measurement data and the third measurement data, and to send the effective values ​​of the second measurement data and the third measurement data to the online monitoring backend via telemetry. The online monitoring backend is used to display the received first measurement data, second measurement data, and third measurement data in real time through a graphical interface; it sets alarm upper and lower limits and fault upper and lower limits for the first, second, and third measurement data respectively, and performs alarm or fault judgment on the received first, second, and third measurement data respectively; when any measurement data is judged to be faulty, the fault type is judged according to the preset data between redundant systems, and the correlation between the status of the measuring device corresponding to the faulty measurement data and the fault type is obtained according to the changes of the measured data judged to be faulty, thereby generating a standardized message; wherein, the fault type includes converter station system fault and measuring device fault.

2. An on-line monitoring system for a measuring device as claimed in claim 1, characterized in that The first measurement data includes: the pressure and temperature of sulfur hexafluoride gas; The step of performing alarm or fault judgment on the received first measurement data specifically involves: recording the pressure change trend of the sulfur hexafluoride gas based on its pressure, and judging the sealing performance of the electronic voltage transformer based on the fault upper and lower limits and alarm upper and lower limits of the sulfur hexafluoride gas pressure, thereby displaying the normal signal, alarm signal, or fault signal of the sulfur hexafluoride gas pressure, as well as the pressure data of the sulfur hexafluoride gas, in real time on the graphical interface; recording the temperature change trend of the sulfur hexafluoride gas based on its temperature, and obtaining the temperature status of the sulfur hexafluoride gas based on the fault upper and lower limits and alarm upper and lower limits of the sulfur hexafluoride gas temperature, thereby displaying the normal signal, alarm signal, or fault signal of the sulfur hexafluoride gas temperature, as well as the temperature data of the sulfur hexafluoride gas, in real time on the graphical interface.

3. The on-line monitoring system for a measurement device of claim 1, wherein, The electronic instrument transformer includes an electronic current transformer and an electronic voltage transformer. The step of performing alarm or fault judgment on the received second measurement data specifically involves: recording the changing trends of the laser's temperature and driving current according to the laser's temperature and driving current, and obtaining the laser's temperature and driving current status according to the fault upper and lower limits and alarm upper and lower limits of the laser's temperature and driving current, respectively, and displaying the normal signal, alarm signal or fault signal of the laser's temperature, the normal signal, alarm signal or fault signal of the driving current, as well as the laser's temperature data and driving current data in real time on the graphical interface; Based on the temperature of the remote module, the temperature change trend of the remote module is recorded, and the temperature status of the remote module is obtained based on the fault upper and lower limits and alarm upper and lower limits of the remote module temperature. Thus, the normal signal, alarm signal or fault signal of the remote module temperature, as well as the temperature data of the remote module, are displayed in real time on the graphical interface. The electronic current transformer and the electronic voltage transformer both include the remote module and the laser.

4. The online monitoring system for a measuring device as described in claim 1, characterized in that, The step of alarming or judging the received third measurement data specifically involves: recording the changing trends of light intensity, light source driving current, optical path temperature, and half-wave voltage according to light intensity, light source driving current, optical path temperature, and half-wave voltage, respectively; and obtaining the status of light intensity, light source driving current, optical path temperature, and half-wave voltage according to the fault upper and lower limits and alarm upper and lower limits of light intensity, light source driving current, optical path temperature, and half-wave voltage, respectively. This results in the real-time display of normal signals, alarm signals, or fault signals of light intensity, light source driving current, optical path temperature, and half-wave voltage, as well as the data of light intensity, light source driving current, optical path temperature, and half-wave voltage, on the graphical interface.

5. The online monitoring system for a measuring device as described in claim 1, characterized in that, Also includes: A data server; the data server is used to store the received first measurement data, second measurement data and third measurement data.

6. The online monitoring system for a measuring device as described in claim 5, characterized in that, The online monitoring backend is also used to call up the stored first measurement data, second measurement data and third measurement data, and to display the first measurement data, second measurement data and third measurement data respectively using curves, pie charts or bar charts; Based on the preset data model, the first measurement data, the second measurement data, and the third measurement data are respectively judged for fault type. Based on the changes of the measurement data judged to be faulty, the state of the measuring device corresponding to the measurement data judged to be faulty is compared and associated with the fault type, thereby providing an early warning for the measuring device.

7. The online monitoring system for a measuring device as described in claim 6, characterized in that, The online monitoring backend is also used to display the equipment model, parameters, operating time, number of failures, and causes of failures for each individual measuring device.

8. The online monitoring system for a measuring device as described in claim 1, characterized in that, The voltage transformer online monitoring device transmits the first measurement data to the online monitoring backend via the IEC61850 protocol; The merging units all transmit the second measurement data and the third measurement data to the online monitoring backend via the IEC61850 protocol; The merging unit transmits the second measurement data and the third measurement data to the data processing device via the IEC60044-8 protocol; The data processing device transmits the valid values ​​of the second and third measurement data to the online monitoring backend via the IEC61850 protocol.

9. The online monitoring system for a measuring device as described in claim 1, characterized in that, The calculation of the effective values ​​of the received second and third measurement data specifically involves: The three-phase AC quantities in the received second and third measurement data are calculated in zero or negative order to verify whether the three phases are symmetrical.

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