CN111638051B - On-line monitoring and fault pre-judging method for state of disconnecting link - Google Patents
On-line monitoring and fault pre-judging method for state of disconnecting link Download PDFInfo
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Abstract
The invention discloses a method for on-line monitoring and fault pre-judging of a disconnecting link, which can be matched with one-key sequential control operation to realize double confirmation of the state of the disconnecting link and serve as a second judgment data of double confirmation of the on-off state of the disconnecting link, so that a large amount of operation and maintenance time can be saved, and the working efficiency and the safety can be improved. In addition, the method obtains the trend curve of the disconnecting link switching-on and switching-off process by analyzing the information of the disconnecting link switching-on and switching-off action time, angle, speed and the like, can monitor the operating state of the disconnecting link in a whole life cycle, gives the health state of the disconnecting link to a background, and gives equipment maintenance suggestions in advance when the health state of the disconnecting link is reduced but no abnormal state is generated, thereby preventing large-scale faults.
Description
Technical Field
The invention relates to the technical field of primary equipment online monitoring, in particular to a method for on-line monitoring of a disconnecting link state and pre-judging a fault.
Background
A GIS high-voltage isolating switch, namely a disconnecting link, is used as key primary equipment in a power transmission and transformation system, has the characteristic of more use times, and plays an important role in monitoring the state of the GIS high-voltage isolating switch on the safety of a power grid. Because the disconnecting link is not provided with a special arc extinguishing device, a circuit without load current can only be disconnected, and risks such as contact oxidation, poor contact of movable and static contacts and the like are easily caused in the frequent operation process of the disconnecting link contact under the influence of a working environment, so that the monitoring of the switching-on and switching-off state of the disconnecting link and the prejudgment of an operation fault are particularly important. At present, the on-off state of the isolating switch of the GIS equipment in China is usually judged whether the isolating switch is in place by remote signaling signals and field manual observation, and the methods have subjectivity and low efficiency. In addition, some transformer substations are unattended stations, manual confirmation cannot be usually carried out on a remote control operation site, and certain risk is achieved. Some stations adopt methods such as image recognition, pressure sensing and the like to assist in judging the position state of the isolating switch, but the position monitoring method still has more problems in the aspects of stability, accuracy, adaptability and the like, for example, the algorithm of the image recognition method is complex to realize, the accuracy is not high, the installation of the pressure sensing method is difficult, and uninterrupted deployment and replacement cannot be realized. The existing method for monitoring the opening and closing positions of the isolating switch has certain limitations, and needs to find a new technical method and a new technical means to realize the accurate judgment of the opening and closing positions. In addition, when the GIS disconnecting link runs outdoors for a long time, due to the fact that the operation times are few, the phenomena of blocking and corrosion of a transmission mechanism, internal faults of a motor and the like can occur, the disconnecting link is unstable, the safe running of a power grid system is endangered, the faults of the disconnecting link need to be judged and analyzed in advance through a certain method, when the disconnecting link does not have serious faults, equipment maintenance suggestions are given in advance, and electric power safety events are reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for on-line monitoring and fault prejudgment of the disconnecting link state, which is used for realizing real-time monitoring of the opening and closing state of a GIS disconnecting link and fault prediction of the disconnecting link in daily opening and closing operation, reducing the risk of failure operation and improving the safety.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a method for on-line monitoring of the state of a disconnecting link and pre-judging faults comprises the following steps: s01), respectively installing the multi-parameter attitude sensors on external transmission shafts or connecting levers of the GIS disconnecting links of each phase;
s02), calibrating the initial position of the multi-parameter attitude sensor, and if the in-place threshold value of the disconnecting link is alpha, the in-place threshold value of the switching on is beta, the in-place position of the disconnecting link is a, and the in-place position of the switching on is b, the normal angle range of the disconnecting link operation is as follows: theta is more than or equal to alpha and less than or equal to alpha and alpha + alpha, otherwise, the output switching-off is abnormal, and the angle range of the normal switching-on operation is as follows: b-beta is not less than theta and not more than b + beta, otherwise, abnormal closing is output;
s03), configuring parameters of a receiving device, setting communication parameters of the receiving device, calibrating a switching-on and switching-off time threshold value, and setting the number of disconnecting link configuration sensors;
s04), after the first calibration is completed, the multi-parameter attitude sensor starts uninterrupted information acquisition and real-time state judgment;
s05), the multi-parameter attitude sensor transmits the switching-on and switching-off state judgment information and the original information of each corresponding phase of disconnecting link to the receiving device;
s06), the receiving device comprehensively analyzes and judges the received information to realize the online monitoring and fault pre-judgment of the state of the disconnecting link, uploads the comprehensive analysis result, the state information of each phase of the disconnecting link and the collected information of the sensor by a standard protocol, stores the information including the opening and closing time, the angle, the angular speed and the operating record of the disconnecting link in the receiving device, and performs trend analysis by matching with a disconnecting link state monitoring and early warning system;
s07), the receiving device completes conversion of the disconnecting link state information, transmits the information to the disconnecting link state monitoring and early warning system through the network, outputs the information to the transformer substation measurement and control system in the form of a relay hard node, completes auxiliary judgment of disconnecting link switching-on and switching-off operation in the form of second criterion, and achieves online monitoring of the disconnecting link state.
Furthermore, the receiving device analyzes and judges the received multi-parameter attitude sensor data, and the specific process of realizing the on-line monitoring of the state of the disconnecting link is as follows: the multi-parameter attitude sensor collects the switching-on and switching-off state information of the three-phase disconnecting link and then transmits the information to the receiving device, when the switching-on state is the same, the receiving device judges that the switching-on state of the disconnecting link equipment is in place, when the switching-off state is the same, the receiving device judges that the switching-off state of the disconnecting link equipment is in place, and otherwise, the switching-on state or the switching-off state is determined to be abnormal; and the receiving device further transmits the process data and the comprehensive judgment result to the disconnecting link state monitoring and early warning system through a standard protocol, and the disconnecting link is connected to a transformer substation protection measurement and control system through a relay hard link.
Furthermore, the receiving device analyzes and judges the data of the multi-parameter attitude sensor, and the specific process for realizing the prejudgment of the knife switch fault is as follows: analyzing the switch-on and switch-off time and angle information of the disconnecting link uploaded by the multi-parameter attitude sensor to form a curve 1 and a curve 2, wherein the curve 1 is a normal switch-on and switch-off angle-time curve configured when the disconnecting link device leaves a factory, the curve 2 is a switch-on and switch-off angle-time curve when the disconnecting link device runs, the normal switch-on and switch-off time of the disconnecting link control mechanism and the operation time difference delta T under an abnormal condition are determined according to the curve 1 and the curve 2, when the delta T continuously exceeds 20% of the normal switch-on and switch-off time T1 of the disconnecting link control mechanism for 2 times, the disconnecting link is judged to be in an unhealthy state, meanwhile, a switch health state indicating lamp is lightened, the switch health state is transmitted to a switch state monitoring and early warning system through a receiving device, and the receiving device stores the switch-on and switch-off time, the angle and the angular speed for reference calling during operation and maintenance.
Further, according to the acquired time, angle, angular velocity and knife switch operation record information, trend analysis data is formed, and the specific process is as follows: and the receiving device acquires the preliminary health state of the disconnecting link according to the acquired time and angle information, and when the state of the disconnecting link is unhealthy, the time, the angle, the angular speed and the operating record of the disconnecting link are transmitted to the disconnecting link state monitoring and early warning system to form an angle-time curve and an angular speed-time curve, and the angle-time curve and the angular speed-time curve are compared with the historical data of the equipment to analyze whether the equipment needs to be overhauled or not, so that an overhauling suggestion is given.
Furthermore, for each disconnecting link, the receiving device outputs 3 paths of relay hard contact signals, 2 paths of relay hard contact signals are used for indicating the condition of the opening and closing positions of the disconnecting link body, and 1 path of contact signals indicate the faults of the sensor.
Further, the receiving device is provided with a disconnecting link health status indicator lamp for disconnecting link fault prejudgment indication.
Further, the receiving device is configured with 6 485 interfaces, 2 optical ports of 1000M and 2 adaptive ports of 1000/100M.
Further, the receiving device can store the knife switch operation records and the knife switch state information for not less than 100 times, and the power failure is not lost.
Furthermore, the receiving device is matched with the disconnecting link state monitoring and early warning system to form an angle-time curve and an angular speed-time curve, trend analysis and query are carried out, the collected data are compared with the normal historical trend of the equipment, and whether maintenance is needed or not is analyzed.
The invention has the beneficial effects that: the invention can realize the double confirmation of the disconnecting link state by matching with one-key sequential control operation, and can save a large amount of operation and maintenance time and improve the working efficiency and the safety as the second judgment data of the double confirmation of the disconnecting link on-off state. In addition, the method obtains the trend curve of the disconnecting link switching-on and switching-off process by analyzing the information of the disconnecting link switching-on and switching-off action time, angle, speed and the like, can monitor the operating state of the disconnecting link in a whole life cycle, gives the health state of the disconnecting link to a background, and gives equipment maintenance suggestions in advance when the health state of the disconnecting link is reduced but no abnormal state is generated, thereby preventing large-scale faults.
Drawings
FIG. 1 is a flow chart of the present method;
FIG. 2 is a flow chart of fault prognosis;
FIG. 3 is a schematic diagram of a brake-off angle-time characteristic curve;
fig. 4 is a schematic diagram of the analysis process of the health status of the knife switch.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The embodiment discloses a method for on-line monitoring and fault pre-judging of a disconnecting link state, which is realized by a system for on-line monitoring and fault pre-judging of the disconnecting link state, wherein the system for on-line monitoring and fault pre-judging of the disconnecting link state comprises a multi-parameter attitude sensor, a receiving device and a disconnecting link state monitoring and early warning system, and comprises the following steps:
the multi-parameter attitude sensor transmits the position information of the disconnecting link to a receiving device on the spot in an industrial bus mode, and the receiving device outputs a passive electrical contact to a transformer substation protection measurement and control system after the receiving device is distinguished by the switching-on and switching-off position. The receiving device converts the state signal of the sensor and the health state of the disconnecting link and outputs the state signal and the health state of the disconnecting link to the disconnecting link state monitoring and early warning system through a standard protocol, and real-time monitoring of the state of the disconnecting link is achieved.
The multi-parameter attitude sensor is a multi-parameter attitude sensing system, is installed on the wall of a connecting rod outside a GIS disconnecting link, is provided with a high-performance processor, a high-precision screw instrument, an accelerometer and an angle sensor, can acquire multi-parameter data in real time and resolve the attitude of a corresponding sensor in real time, and outputs corresponding disconnecting link state judgment information. In addition, the multi-parameter attitude sensor is provided with an electromagnetic interference protection system, and corresponding protection measures of a complex electromagnetic compatibility environment are set aiming at different electromagnetic interference factors existing in the environment of the sensor, so that the multi-parameter attitude sensor has good protection capability.
After the multi-parameter attitude sensor finishes the first calibration, uninterrupted data acquisition is carried out, the acquired information is subjected to real-time calculation of the disconnecting link state, four disconnecting link states of in-place disconnecting link, in-place closing link, abnormal disconnecting link and abnormal closing link are output, and the information quantity of the disconnecting link action, such as the disconnecting link switching-on and switching-off time, angle, acceleration and the like, is reflected. Meanwhile, the on-off state operation confirmation can be carried out by matching with one-key sequential control, and the 'double confirmation' of the disconnecting link state is completed in the form of a second criterion.
The receiving device has the functions of data receiving, power standard protocol output, information multi-channel output, fault pre-judgment and the like. The system can receive original data and result data transmitted by a multi-parameter attitude sensor, can perform comprehensive analysis on the received result data, and can perform fault prejudgment on the switching-on and switching-off operations by combining historical records; various data can be continuously uploaded to the upper network system through different paths; the system can realize field on-site program upgrading and sensor precision calibration, and can issue instructions through a disconnecting link state monitoring and early warning system or a device per se to call the acquired data of any one sensor.
The receiving apparatus includes, in a hardware interface configuration: providing 4 network interfaces (2 optical-2 electrical) or 24 switching value output interfaces; the switching value output interface is a normally open passive contact; for each disconnecting link, the receiving device outputs 3 paths of switching value signals, 2 paths of switching value signals are used for indicating the condition of the opening and closing positions of the disconnecting link body, and 1 path of contact point signals indicate the faults of the sensor.
The receiving device is provided with a disconnecting link health state indicator lamp for disconnecting link fault prejudgment indication.
The receiving device can store the knife switch operation records and the knife switch state information for not less than 100 times, and the power failure is not lost.
The disconnecting link state monitoring and early warning system is composed of a sensor management module, a disconnecting link device management module, a shared memory module, a disconnecting link state monitoring and early warning module, a monitoring trend analysis module and a historical data storage and query module, is designed in a modularized mode, a software interface is flexibly edited according to actual requirements, the working states and the self-checking states of the sensor and a receiving device are monitored in real time, meanwhile, disconnecting link state data are stored through the reading and receiving device, an angle-time curve and an angular speed-time curve are formed, the angle-time curve and the angular speed-time curve are compared with historical data of the device, whether maintenance is needed or not is analyzed, maintenance suggestions are given, and the disconnecting link state monitoring and early warning system can be independently deployed and can also be integrated into an existing auxiliary control platform of a transformer substation.
As shown in fig. 1, the method of this embodiment includes the following steps:
s01), respectively installing the multi-parameter attitude sensors on external transmission shafts or connecting levers of the GIS disconnecting links of each phase;
s02), calibrating the initial position of the multi-parameter attitude sensor, and if the in-place threshold value of the disconnecting link is alpha, the in-place threshold value of the switching on is beta, the in-place position of the disconnecting link is a, and the in-place position of the switching on is b, the normal angle range of the disconnecting link operation is as follows: theta is more than or equal to alpha and less than or equal to alpha and alpha + alpha, otherwise, the output switching-off is abnormal, and the angle range of the normal switching-on operation is as follows: b-beta is not less than theta and not more than b + beta, otherwise, abnormal closing is output;
s03), configuring parameters of a receiving device, setting communication parameters of the receiving device, calibrating a switching-on and switching-off time threshold value, and setting the number of disconnecting link configuration sensors;
s04), after the first calibration is completed, the multi-parameter attitude sensor starts uninterrupted information acquisition and real-time state judgment;
s05), the multi-parameter attitude sensor transmits the switching-on and switching-off state judgment information and the original information of each corresponding phase of disconnecting link to the receiving device;
s06), the receiving device comprehensively analyzes and judges the received information to realize the online monitoring and fault pre-judgment of the state of the disconnecting link, uploads the comprehensive analysis result, the state information of each phase of the disconnecting link and the collected information of the sensor by a standard protocol, stores the information including the opening and closing time, the angle, the angular speed and the operating record of the disconnecting link in the receiving device, and performs trend analysis by matching with a disconnecting link state monitoring and early warning system;
s07), the receiving device completes conversion of the disconnecting link state information, transmits the information to the disconnecting link state monitoring and early warning system through the network, outputs the information to the transformer substation measurement and control system in the form of a relay hard node, completes auxiliary judgment of disconnecting link switching-on and switching-off operation in the form of second criterion, and achieves online monitoring of the disconnecting link state.
In this embodiment, the receiving device analyzes and judges the received multi-parameter attitude sensor data, and the specific process of realizing the on-line monitoring of the state of the disconnecting link is as follows: the multi-parameter attitude sensor collects the switching-on and switching-off state information of the three-phase disconnecting link and then transmits the information to the receiving device, when the switching-on state is the same, the receiving device judges that the switching-on state of the disconnecting link equipment is in place, when the switching-off state is the same, the receiving device judges that the switching-off state of the disconnecting link equipment is in place, and otherwise, the switching-on state or the switching-off state is determined to be abnormal; and the receiving device further transmits the process data and the comprehensive judgment result to the disconnecting link state monitoring and early warning system through a standard protocol, and the disconnecting link is connected to a transformer substation protection measurement and control system through a relay hard link.
As shown in fig. 2, in this embodiment, the receiving device calibrates the switch-on/off time of the disconnecting link, and analyzes the switch-on/off time of the disconnecting link, and the angle θ measured by the multi-parameter attitude sensor reflects the rotation angle of the transmission shaft or the crank arm of the disconnecting link. After the disconnecting link is switched on and off, the receiving device establishes an angle-time characteristic curve theta (t) according to the received disconnecting link rotation angle theta and the time t.
As shown in fig. 3, a switching-off angle-time curve is shown, where a curve 1 is a normal switching-off angle-time curve configured when the disconnecting link device leaves a factory, a curve 2 is a switching-off angle-time curve when the disconnecting link device is in an operating state, T1 is normal switching-off time when the disconnecting link device leaves the factory, T2 is switching-off time of the switching-off operation, and if there are problems such as spring jamming or motor failure during the switching-off operation, the operation time is abnormal, and a difference Δ T between the normal switching-off time of the switching-off operation mechanism and the operation time under an abnormal condition is used as a fault characteristic parameter of the GIS disconnecting link; when the delta T continuously exceeds 20 percent of the normal switching-off time T1 when the equipment leaves the factory for 2 times, the state of the disconnecting link is judged to be unhealthy. The curve of the closing angle and the closing time of the knife switch is analyzed in the same way; the analysis process is shown in fig. 4.
In order to further analyze the state of the disconnecting link, trend analysis data is formed according to the acquired time, angle, angular velocity and disconnecting link operation record information, and the specific process is as follows: and the receiving device acquires the preliminary health state of the disconnecting link according to the acquired time and angle information, and when the state of the disconnecting link is unhealthy, the time, the angle, the angular speed and the operating record of the disconnecting link are transmitted to the disconnecting link state monitoring and early warning system to form an angle-time curve and an angular speed-time curve, and the angle-time curve and the angular speed-time curve are compared with the historical data of the equipment to analyze whether the equipment needs to be overhauled or not, so that an overhauling suggestion is given.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (5)
1. A method for on-line monitoring of the state of a disconnecting link and pre-judging faults is characterized in that: the method comprises the following steps: s01), respectively installing the multi-parameter attitude sensors on external transmission shafts or connecting levers of the GIS disconnecting links of each phase;
s02), calibrating the initial position of the multi-parameter attitude sensor, and if the in-place threshold value of the disconnecting link is alpha, the in-place threshold value of the switching on is beta, the in-place position of the disconnecting link is a, and the in-place position of the switching on is b, the normal angle range of the disconnecting link operation is as follows: theta is more than or equal to alpha and less than or equal to alpha and alpha + alpha, otherwise, the output switching-off is abnormal, and the angle range of the normal switching-on operation is as follows: b-beta is not less than theta and not more than b + beta, otherwise, abnormal closing is output;
s03), configuring parameters of a receiving device, setting communication parameters of the receiving device, calibrating a switching-on and switching-off time threshold value, and setting the number of disconnecting link configuration sensors;
s04), after the first calibration is completed, the multi-parameter attitude sensor starts uninterrupted information acquisition and real-time state judgment;
s05), the multi-parameter attitude sensor transmits the switching-on and switching-off state judgment information and the original information of each corresponding phase of disconnecting link to the receiving device;
s06), the receiving device carries out comprehensive analysis and judgment on the received information to realize the online monitoring and fault pre-judgment of the state of the disconnecting link, uploads the comprehensive analysis result, the state information of the disconnecting link of each phase and the collected information of the sensor by a standard protocol, stores the information including the switching-on and switching-off time, the angle, the angular speed and the operating record of the disconnecting link in the receiving device, and carries out trend analysis by matching with a disconnecting link state monitoring and early warning system;
the receiving device analyzes and judges the data of the multi-parameter attitude sensor, and the specific process of realizing the on-line monitoring of the state of the disconnecting link is as follows: the multi-parameter attitude sensor collects the switching-on and switching-off state information of the three-phase disconnecting link and then transmits the information to the receiving device, when the switching-on state is the same, the receiving device judges that the switching-on state of the disconnecting link equipment is in place, when the switching-off state is the same, the receiving device judges that the switching-off state of the disconnecting link equipment is in place, and otherwise, the switching-on state or the switching-off state is determined to be abnormal; then the receiving device transmits the process data and the comprehensive judgment result to a disconnecting link state monitoring and early warning system through a standard protocol, and a relay is connected to a transformer substation protection measurement and control system in a hard mode;
the receiving device analyzes and judges the data of the multi-parameter attitude sensor, and the specific process for realizing the prejudgment of the fault of the disconnecting link is as follows: analyzing the switch-on and switch-off time and angle information of the disconnecting link uploaded by the multi-parameter attitude sensor to form a curve 1 and a curve 2, wherein the curve 1 is a normal switch-on and switch-off angle-time curve configured when the disconnecting link device leaves a factory, the curve 2 is a switch-on and switch-off angle-time curve when the disconnecting link device runs, the normal switch-on and switch-off time of the disconnecting link control mechanism and the operation time difference delta T under an abnormal condition are determined according to the curve 1 and the curve 2, when the delta T continuously exceeds 20% of the normal switch-on and switch-off time T1 of the disconnecting link control mechanism for 2 times, the disconnecting link is judged to be in an unhealthy state, meanwhile, a switch health state indicator lamp is turned on, the health state of the disconnecting link is transmitted to a disconnecting link state monitoring and early warning system through a receiving device, and the receiving device stores the switch-on and switch-off time, the angle and the angular speed for reference calling during operation and maintenance;
s07), the receiving device completes conversion of the disconnecting link state information, transmits the information to the disconnecting link state monitoring and early warning system through the network, outputs the information to the transformer substation measurement and control system in the form of a relay hard node, completes auxiliary judgment of disconnecting link switching-on and switching-off operation in the form of second criterion, and achieves online monitoring of the disconnecting link state.
2. The method for on-line monitoring and fault pre-judging of the disconnecting link state according to claim 1, wherein the method comprises the following steps: forming trend analysis data according to the acquired time, angle, angular speed and knife switch operation record information, wherein the specific process comprises the following steps: and the receiving device acquires the preliminary health state of the disconnecting link according to the acquired time and angle information, and when the state of the disconnecting link is unhealthy, the time, the angle, the angular speed and the operating record of the disconnecting link are transmitted to the disconnecting link state monitoring and early warning system to form an angle-time curve and an angular speed-time curve, and the angle-time curve and the angular speed-time curve are compared with the historical data of the equipment to analyze whether the equipment needs to be overhauled or not, so that an overhauling suggestion is given.
3. The method for on-line monitoring and fault pre-judging of the disconnecting link state according to claim 1, wherein the method comprises the following steps: the receiving device is provided with 6 485 interfaces, 2 optical ports of 1000M and 2 adaptive ports of 1000/100M.
4. The method for on-line monitoring and fault pre-judging of the state of the knife switch according to the claim 1 or 3, characterized in that: the receiving device is provided with a disconnecting link health state indicator lamp for disconnecting link fault prejudgment indication.
5. The method for on-line monitoring and fault pre-judging of the disconnecting link state according to claim 1, wherein the method comprises the following steps: the receiving device can store the knife switch operation records and the knife switch state information for not less than 100 times, and the power failure is not lost.
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| CN112285545B (en) * | 2020-10-14 | 2021-06-04 | 江门市电力工程输变电有限公司 | GIS disconnecting switch opening and closing test method |
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| CN113189480A (en) * | 2021-04-22 | 2021-07-30 | 西安交通大学 | Fault diagnosis method and device in closing/opening process of isolating switch |
| CN113765219A (en) * | 2021-08-18 | 2021-12-07 | 中国南方电网有限责任公司超高压输电公司大理局 | Power system knife switch control method and device, computer equipment and storage medium |
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| CN113963980B (en) * | 2021-10-20 | 2024-05-07 | 广东电网有限责任公司 | Switch remote identification system |
| CN113885420A (en) * | 2021-11-10 | 2022-01-04 | 山东电工电气集团有限公司 | Data acquisition control method for disconnecting link state monitoring device |
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Effective date of registration: 20221008 Address after: 17/F, Building 5, District 5, Hanyu Financial and Business Center, High tech Zone, Jinan, Shandong 250000 Patentee after: SHANDONG ELECTRICAL ENGINEERING & EQUIPMENT GROUP Co.,Ltd. Patentee after: Shandong Electric Group Digital Technology Co.,Ltd. Address before: 250101 No.16 Chonghua Road, high tech Development Zone, Jinan City, Shandong Province Patentee before: SHANDONG ELECTRICAL ENGINEERING & EQUIPMENT GROUP Co.,Ltd. |