CN104407286A - Method for monitoring mechanical states of high-voltage isolating switches and emitting warning - Google Patents
Method for monitoring mechanical states of high-voltage isolating switches and emitting warning Download PDFInfo
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Abstract
The invention relates to a method for monitoring mechanical states of high-voltage isolating switches and emitting warning, and belongs to the field of technologies for monitoring power transformation equipment in an online manner. The method for monitoring the mechanical states of the high-voltage isolating switches and emitting warning has the advantages that working currents, which represent the magnitude of operation resistance, of driving motors are monitored during opening or closing operation on the high-voltage isolating switches in real time, so that operation resistance change conditions can be comprehensively monitored in integral operation procedures, defects such as jamming and movement failure of equipment can be timely found out, and equipment state maintenance or state evaluation can be effectively supported; the method is simple in implementation and simple, clear and reliable in principle, and increase of the complexity of the original equipment can be prevented when the method is implemented; the mechanical states of the high-voltage isolating switches can be diagnosed in real time, defect types of the mechanical states of the high-voltage isolating switches can be intelligently judged, warning can be timely emitted, accordingly, severe faults of the equipment can be effectively prevented, and economic loss and social influence can be reduced.
Description
Technical field
The present invention relates to the monitoring of a kind of high voltage isolator machine performance and method for early warning, belong to converting equipment on-line monitoring technique field.
Background technology
High voltage isolator is as one of important switchgear of electric system, and in system primary equipment, usage quantity is maximum, mainly plays the effect of isolation voltage, ensures the safety of other electrical equipments when service work.Due to reasons such as manufacture, installation, environment for use and operation maintenance, often there is the defects such as water diversion part is overheated, gear train bite, tripping, operation porcelain insulator breaking in high voltage isolator, has a strong impact on network system safe and stable operation.
Since China's grid equipment implements in full repair based on condition of component, a series of research has been carried out to high voltage isolator state-detection means, as utilized infrared temperature-test technology Timeliness coverage water diversion part overheating defect, adopt insulator UT (Ultrasonic Testing) technology for detection operation porcelain vase inherent vice.But for the defect that high voltage isolator mechanical aspects exists, as operated bite, tripping etc., there is no effective monitoring and evaluation measures at present, can only be found by on-off switch manually when equipment prophylactic repair, cause above-mentioned defect cannot Timeliness coverage.
Under current most domestic transformer station adopts unmanned collection control operational mode, when by the electronic separating brake of centralized control center's Long-distance Control high voltage isolator or closing operation, due to on-the-spot without effectively monitoring and early warning means, disconnector mechanical defect cannot Timeliness coverage, when defect equipment is forced to cause the catastrophic failures such as operation porcelain insulator breaking during electric operating, cause electric grid large area power cut accident.
China Patent No. is the disclosed torsional forces on-line measuring device for high voltage isolator of ZL200920063880.1 and method, adopt the method installing torque sensor between high voltage isolating switch operating mechanism and operation porcelain vase additional, real-time detection disconnector divides/closing operation process in operate resistance on porcelain vase, whether there is the defect such as bite, tripping because Installation and Debugging are improper with this detection and isolation switch.The method need be changed original equipment structure, may impact original equipment design performance index.When the torque sensor installed additional runs under environment out of doors, be subject to the adverse weather conditions such as low temperature, severe cold, cause output data distortion, cannot ensure to run reliably and with long-term.In addition, the method need carry out manual analysis judgement to torque curve, does not possess intelligent diagnostics and real-time early warning function.
Summary of the invention
The object of the invention is to propose the monitoring of a kind of high voltage isolator machine performance and method for early warning, by the drive motor working current value of characterization operations drag size when Real Time Monitoring equipment separating brake or closing operation, intelligent decision plant machinery state and defect type, the timely early warning when equipment is in attention or abnormality.
The high voltage isolator machine performance monitoring that the present invention proposes and method for early warning, comprise the following steps:
(1) run working current according to the drive motor of high voltage isolator, obtain the working current curve of drive motor when the working current curve of drive motor during high voltage isolator normal sub-switching operation or normal closing operation;
(2) carry out process conversion to above-mentioned working current curve, obtain decision threshold, detailed process comprises the following steps:
(2-1) utilize low-pass filtering method, denoising is carried out to above-mentioned working current curve;
(2-2) Hilbert transform is carried out to the working current curve after above-mentioned denoising, obtain the amplitude envelope curve of working current curve;
(2-3) above-mentioned amplitude envelope curve is divided into two time intervals, wherein very first time length of an interval degree is x% × T, the length of the second time interval is then (100-x) % × T, current peak is extracted respectively from two time intervals, and the current peak in very first time interval is defined as starting current peak value, the current peak of the second time interval is defined as running current peak value, and wherein T is total duration of amplitude envelope curve, and the span of x is 5 ~ 15;
(2-4) be worth as reference according to above-mentioned starting current peak value and running current peak value, setting threshold value is as follows: starting current peak value × (1.2 ~ 1.5) are starting current peak value demand value, starting current peak value × (2 ~ 3) are starting current peak value exceptional value, running current peak value × (1.2 ~ 1.5) are running current peak value demand value, and running current peak value × (2 ~ 3) are running current peak value exceptional value;
(3) the drive motor working current curve of current high voltage isolator sub-switching operation corresponding with step (1) or the drive motor working current curve of current high voltage isolator closing operation is obtained;
(4) repeat step (2-1) ~ step (2-3), the working current curve of step (3) is processed, obtains the current starting current peak value of high voltage isolator and current running current peak value;
(5) the current starting current peak value of above-mentioned high voltage isolator and current running current peak value are compared with four threshold values of step (2-4) respectively, judge the machine performance that high voltage isolator is current and defect type, concrete decision rule is as follows:
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and current running current peak L EssT.LTssT.LT running current peak value demand value, then the machine performance that high voltage isolator is current is normal condition, and defect type is nothing;
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and current running current peak value >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is serious bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and current running current peak L EssT.LTssT.LT running current peak value demand value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and current running current peak value >=running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is serious bite;
If current starting current peak value >=starting current peak value exceptional value, and current running current peak L EssT.LTssT.LT running current peak value demand value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak value >=starting current peak value exceptional value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak value >=starting current peak value exceptional value, and current running current peak value >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
(6) by machine performance current for above-mentioned high voltage isolator and defect type result of determination write into Databasce, and result of determination be attention state or abnormality time, machine performance and defect type result of determination are exported as alarm signal.
The high voltage isolator machine performance monitoring that the present invention proposes and method for early warning, its advantage is:
(1) high voltage isolator machine performance monitoring of the present invention and method for early warning, principle is concisely reliable, by drive motor working current when Real-Time Monitoring high voltage isolator separating brake or closing operation, realize the comprehensive monitoring operating change in resistance situation in whole operating process, thus the defects such as Timeliness coverage equipment bite, tripping, for equipment state overhauling or state estimation provide effective support;
(2) the inventive method realizes simple, does not need to change original equipment structure, also do not increase original equipment complexity during enforcement;
(3) the inventive method possesses intelligent diagnostics and warning function, after the current separating brake of high voltage isolator or closing operation terminate, the real-time diagnosis of machine performance and the intelligent decision of defect type can be completed, send early warning in time, effectively avoid equipment catastrophic failure to occur, reduce economic loss and social influence.
Accompanying drawing explanation
Fig. 1 is the current amplitude enveloping curve Characteristic Extraction schematic diagram related in the inventive method.
Fig. 2 is the high voltage isolator Current mechanical state and defect type decision rule table that relate in the inventive method.
Embodiment
The high voltage isolator machine performance monitoring that the present invention proposes and method for early warning, comprise the following steps:
(1) run working current according to the drive motor of high voltage isolator, obtain the working current curve of drive motor when the working current curve of drive motor during high voltage isolator normal sub-switching operation or normal closing operation;
(2) carry out process conversion to above-mentioned working current curve, obtain decision threshold, detailed process comprises the following steps:
(2-1) utilize low-pass filtering method, carry out denoising to above-mentioned working current curve, because drive motor working current curve is generally the AC signal that frequency is less than 1kHz, the upper frequency limit of low-pass filtering generally gets 1kHz-10kHz;
(2-2) Hilbert transform is carried out to the working current curve after above-mentioned denoising, obtain the amplitude envelope curve of working current curve;
(2-3) above-mentioned amplitude envelope curve is divided into two time intervals, as shown in Figure 1, wherein very first time length of an interval degree is x% × T, the unloading phase of characterizing high voltage isolator transient state, as the T0 in figure, the length of the second time interval is then (100-x) % × T, characterize high voltage isolator steady state operation phase, as the T1 in figure, current peak is extracted respectively from two time intervals, and the current peak in very first time interval is defined as starting current peak value, as the I0 in figure, the current peak of the second time interval is defined as running current peak value, as the I 1 in figure, wherein T is total duration of amplitude envelope curve, the span of x is 5 ~ 15, the value of x is generally determined according to the version of high voltage isolator and the output power of drive motor, generally, high voltage isolator version is simpler, drive motor output power is larger, drive motor is shorter for start-up time, then x value should suitably reduce,
(2-4) be worth as reference according to above-mentioned starting current peak value and running current peak value, setting threshold value is as follows: starting current peak value × (1.2 ~ 1.5) are starting current peak value demand value, starting current peak value × (2 ~ 3) are starting current peak value exceptional value, running current peak value × (1.2 ~ 1.5) are running current peak value demand value, running current peak value × (2 ~ 3) are running current peak value exceptional value, the setting ratio value of above-mentioned threshold value relative reference value, determine according to testing the drive motor working current value that records under common model high voltage isolator simulation bite and tripping defect situation, for specific model high voltage isolator, should determine according to actual tests test value,
(3) the drive motor working current curve of current high voltage isolator sub-switching operation corresponding with step (1) or the drive motor working current curve of current high voltage isolator closing operation is obtained;
(4) repeat step (2-1) ~ step (2-3), the working current curve of step (3) is processed, obtains the current starting current peak value of high voltage isolator and current running current peak value;
(5) the current starting current peak value of above-mentioned high voltage isolator and current running current peak value are compared with four threshold values of step (2-4) respectively, judge the machine performance that high voltage isolator is current and defect type, as shown in Figure 2, concrete decision rule is as follows:
If current starting current peak I 0 < starting current peak value demand value, and current running current peak I 1 < running current peak value demand value, the machine performance that then high voltage isolator is current is normal condition, and defect type is nothing;
If current starting current peak I 0 < starting current peak value demand value, and running current peak value demand value≤current running current peak I 1 < running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If current starting current peak I 0 < starting current peak value demand value, and current running current peak I 1 >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is serious bite;
If starting current peak value demand value≤current starting current peak I 0 < starting current peak value exceptional value, and current running current peak I 1 < running current peak value demand value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak I 0 < starting current peak value exceptional value, and running current peak value demand value≤current running current peak I 1 < running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak I 0 < starting current peak value exceptional value, and current running current peak I 1 >=running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is serious bite;
If current starting current peak I 0 >=starting current peak value exceptional value, and current running current peak I 1 < running current peak value demand value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak I 0 >=starting current peak value exceptional value, and running current peak value demand value≤current running current peak I 1 < running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak I 0 >=starting current peak value exceptional value, and current running current peak I 1 >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
(6) by machine performance current for above-mentioned high voltage isolator and defect type result of determination write into Databasce, and result of determination be attention state or abnormality time, machine performance and defect type result of determination are exported as alarm signal, if high voltage isolator belongs to equipment in intelligent substation, usually above-mentioned alarm signal need be outputted to transformer station's comprehensive monitoring system so that IEC61850 Standards Code is long-range.
Claims (1)
1. the monitoring of high voltage isolator machine performance and a method for early warning, is characterized in that the method comprises the following steps:
(1) run working current according to the drive motor of high voltage isolator, obtain the working current curve of drive motor when the working current curve of drive motor during high voltage isolator normal sub-switching operation or normal closing operation;
(2) carry out process conversion to above-mentioned working current curve, obtain decision threshold, detailed process comprises the following steps:
(2-1) utilize low-pass filtering method, denoising is carried out to above-mentioned working current curve;
(2-2) Hilbert transform is carried out to the working current curve after above-mentioned denoising, obtain the amplitude envelope curve of working current curve;
(2-3) above-mentioned amplitude envelope curve is divided into two time intervals, wherein very first time length of an interval degree is x% × T, the length of the second time interval is then (100-x) % × T, current peak is extracted respectively from two time intervals, and the current peak in very first time interval is defined as starting current peak value, the current peak of the second time interval is defined as running current peak value, and wherein T is total duration of amplitude envelope curve, and the span of x is 5 ~ 15;
(2-4) be worth as reference according to above-mentioned starting current peak value and running current peak value, setting threshold value is as follows: starting current peak value × (1.2 ~ 1.5) are starting current peak value demand value, starting current peak value × (2 ~ 3) are starting current peak value exceptional value, running current peak value × (1.2 ~ 1.5) are running current peak value demand value, and running current peak value × (2 ~ 3) are running current peak value exceptional value;
(3) the drive motor working current curve of current high voltage isolator sub-switching operation corresponding with step (1) or the drive motor working current curve of current high voltage isolator closing operation is obtained;
(4) repeat step (2-1) ~ step (2-3), the working current curve of step (3) is processed, obtains the current starting current peak value of high voltage isolator and current running current peak value;
(5) the current starting current peak value of above-mentioned high voltage isolator and current running current peak value are compared with four threshold values of step (2-4) respectively, judge the machine performance that high voltage isolator is current and defect type, concrete decision rule is as follows:
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and current running current peak L EssT.LTssT.LT running current peak value demand value, then the machine performance that high voltage isolator is current is normal condition, and defect type is nothing;
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If current starting current peak L EssT.LTssT.LT starting current peak value demand value, and current running current peak value >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is serious bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and current running current peak L EssT.LTssT.LT running current peak value demand value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is attention state, and defect type is slight bite;
If starting current peak value demand value≤current starting current peak L EssT.LTssT.LT starting current peak value exceptional value, and current running current peak value >=running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is serious bite;
If current starting current peak value >=starting current peak value exceptional value, and current running current peak L EssT.LTssT.LT running current peak value demand value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak value >=starting current peak value exceptional value, and running current peak value demand value≤current running current peak L EssT.LTssT.LT running current peak value exceptional value, the machine performance that then high voltage isolator is current is abnormality, and defect type is tripping;
If current starting current peak value >=starting current peak value exceptional value, and current running current peak value >=running current peak value exceptional value, then the machine performance that high voltage isolator is current is abnormality, and defect type is tripping;
(6) by machine performance current for above-mentioned high voltage isolator and defect type result of determination write into Databasce, and result of determination be attention state or abnormality time, machine performance and defect type result of determination are exported as alarm signal.
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| CN108716988A (en) * | 2018-05-29 | 2018-10-30 | 北京平高清大科技发展有限公司 | A kind of high-tension switch gear machine performance monitoring method and device |
| CN111382809A (en) * | 2020-06-01 | 2020-07-07 | 国网江西省电力有限公司电力科学研究院 | Isolating switch mechanical fault diagnosis method based on motor output power |
| CN111679184A (en) * | 2020-07-06 | 2020-09-18 | 国家电网有限公司 | Method for evaluating performance of isolating switch through motor current |
| CN112557895A (en) * | 2020-12-16 | 2021-03-26 | 国网江苏省电力有限公司检修分公司 | GIS disconnecting switch fault diagnosis method based on multiple characteristic quantities |
| CN112557895B (en) * | 2020-12-16 | 2023-12-22 | 国网江苏省电力有限公司检修分公司 | GIS isolating switch fault diagnosis method based on multiple characteristic quantities |
| CN112731131A (en) * | 2020-12-22 | 2021-04-30 | 珠海万谱科技有限公司 | Fault diagnosis method and device for electric direct-current isolating switch |
| CN114244866A (en) * | 2021-12-02 | 2022-03-25 | 浙商银行股份有限公司 | Production equipment supervisory systems based on thing networking |
| CN116184182A (en) * | 2022-12-15 | 2023-05-30 | 国网安徽省电力有限公司电力科学研究院 | GIS isolating switch mechanical state identification method based on curve similarity |
| CN116184182B (en) * | 2022-12-15 | 2024-04-12 | 国网安徽省电力有限公司电力科学研究院 | GIS isolating switch mechanical state identification method based on curve similarity |
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