CN104407286B - A kind of high voltage isolator machine performance monitoring and method for early warning - Google Patents

A kind of high voltage isolator machine performance monitoring and method for early warning Download PDF

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CN104407286B
CN104407286B CN201410676399.5A CN201410676399A CN104407286B CN 104407286 B CN104407286 B CN 104407286B CN 201410676399 A CN201410676399 A CN 201410676399A CN 104407286 B CN104407286 B CN 104407286B
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current peak
current
value
peak value
running
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CN201410676399.5A
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CN104407286A (en
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李大卫
徐党国
蔡巍
孙云生
刘健
侯力枫
刘中华
吴刚
崔贺平
高宇航
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国家电网公司
华北电力科学研究院有限责任公司
国网冀北电力有限公司电力科学研究院
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Abstract

The present invention relates to a kind of high voltage isolator machine performance monitoring and method for early warning, belong to converting equipment on-line monitoring technique field.The high voltage isolator machine performance monitoring of the present invention and method for early warning, by the motor operating current of sign operation drag size when real-time monitoring high voltage isolator separating brake or closing operation, realize the comprehensive monitoring to resistance situation of change is operated during whole operation, so as to defects such as timely discovering device bite, trippings, it is that equipment state overhauling or state estimation provide effectively support.The inventive method realizes that simply, principle is concisely reliable, does not increase original equipment complexity during enforcement;Real-time diagnosis and the intelligent decision of defect type to the machine performance of high voltage isolator, sends early warning in time, is prevented effectively from the generation of equipment catastrophe failure, reduces economic loss and social influence.

Description

A kind of high voltage isolator machine performance monitoring and method for early warning
Technical field
The present invention relates to a kind of high voltage isolator machine performance monitoring and method for early warning, belong to converting equipment on-line monitoring Technical field.
Background technology
, used as one of important switchgear of power system, quantity used in system primary equipment is most for high voltage isolator Greatly, the effect of isolation voltage is primarily served, it is ensured that safety of other electrical equipments in service work.Due to manufacturing, installing, making With reasons such as environment and operation maintenance, high voltage isolator be frequently present of overheated water diversion part, drive mechanism bite, tripping, The defects such as operation porcelain insulator breaking, have a strong impact on network system safe and stable operation.
Since China's grid equipment implements in full repair based on condition of component, having carried out one to high voltage isolator state-detection means is Row research, such as finds water diversion part overheating defect in time using infrared temperature-test technology, is examined using insulator ultrasonic examination technology Survey operation porcelain vase internal flaw.But for the defect that high voltage isolator mechanical aspects are present, such as operation bite, tripping etc., mesh Before there is no effectively monitoring and evaluation measures, can only be found by manually on-off switch in equipment periodic inspection, Cause drawbacks described above find in time.
In current most domestic transformer station using under unmanned collection control operational mode, when remotely being controlled by centralized control center When the electronic separating brake of high voltage isolator processed or closing operation, as scene is without effectively monitoring and early warning means, disconnecting switch machinery Defect cannot find in time, may cause to operate the catastrophe failures such as porcelain insulator breaking when defect equipment forces electric operating, cause Electric grid large area power cut accident.
China Patent No. is that the disclosed torsional forces on-line checkings for high voltage isolator of ZL200920063880.1 are filled Put and method, the method using torque sensor is installed between high voltage isolating switch operating mechanism and operation porcelain vase additional is examined in real time Operate the resistance on porcelain vase during surveying disconnecting switch point/closing operation, with this detection and isolation switch whether because of installation and debugging not When there is the defects such as bite, tripping.The method need to be modified to original equipment structure, and original equipment design performance index may be made Into impact.When the torque sensor for installing additional is run under environment out of doors, easily by adverse weather conditions such as low temperature, severe cold, cause defeated Go out data distortion, it is impossible to ensure to run reliably and with long-term.Additionally, the method need to carry out manual analyses judgement to torque curve, do not have Standby intelligent diagnostics and real-time early warning function.
Content of the invention
The purpose of the present invention is to propose to a kind of high voltage isolator machine performance monitoring and method for early warning, by real-time monitoring The motor working current value of operation drag size, intelligent decision plant machinery is characterized when analytical equipment separating brake or closing operation State and defect type, the timely early warning when equipment is in attention or abnormality.
High voltage isolator machine performance monitoring proposed by the present invention and method for early warning, comprise the following steps:
(1) operating current is run according to the motor of high voltage isolator, obtains the normal separating brake behaviour of high voltage isolator When making when the operating current curve or normal closing operation of motor motor operating current curve;
(2) process conversion is carried out to above-mentioned operating current curve, obtains decision threshold, detailed process is comprised the following steps:
(2-1) using low-pass filtering method, denoising is carried out to above-mentioned operating current curve;
(2-2) Hilbert transform is carried out to the operating current curve after above-mentioned denoising, obtains operating current curve Amplitude envelope 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, extracts current peak from two time intervals respectively, and will The very first time current peak in interval is defined as starting current peak value, and the current peak of the second time interval is defined as running current The total duration of peak value, wherein T for amplitude envelope curve, the span of x is 5~15;
(2-4) according to above-mentioned starting current peak value and running current peak value as reference value, given threshold is as follows:Start electricity Stream peak value × (1.2~1.5) are starting current peak value demand value, and starting current peak value × (2~3) are starting current peak value exception Value, running current peak value × (1.2~1.5) are running current peak value demand value, and running current peak value × (2~3) are operation electricity Stream peak value exceptional value;
(3) the motor operating current for obtaining the current high voltage isolator sub-switching operation corresponding with step (1) is bent The motor operating current curve of line or current high voltage isolator closing operation;
(4) repeat step (2-1)~step (2-3), processes to the operating current curve of step (3), obtains high pressure Disconnecting switch is currently up current peak and current running current peak value;
(5) by above-mentioned high voltage isolator be currently up current peak and current running current peak value respectively with step (2-4) four threshold values are compared, and judge the current machine performance of high voltage isolator and defect type, concrete judgement rule Then as follows:
If be currently up current peak < starting current peak value demand values, and current running current peak L T.LT.LT running current peak Value demand value, then the current machine performance of high voltage isolator is normal condition, and defect type is nothing;
If be currently up current peak < starting current peak value demand values, and running current peak value demand value≤current operation Current peak < running current peak value exceptional values, then the current machine performance of high voltage isolator be attention state, defect type For slight bite;
If be currently up current peak < starting current peak value demand values, and current running current peak value >=running current peak Value exceptional value, then the current machine performance of high voltage isolator is abnormality, and defect type is serious bite;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and current operation Current peak < running current peak value demand values, then the current machine performance of high voltage isolator be attention state, defect type For slight bite;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and running current Peak value demand value≤current running current peak L T.LT.LT running current peak value exceptional value, the then current machine performance of high voltage isolator For attention state, defect type is slight bite;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and current operation Current peak >=running current peak value exceptional value, then the current machine performance of high voltage isolator be abnormality, defect type For serious bite;
If be currently up current peak >=starting current peak value exceptional value, and current running current peak L T.LT.LT running current peak Value demand value, then the current machine performance of high voltage isolator is abnormality, and defect type is tripping;
If be currently up current peak >=starting current peak value exceptional value, and running current peak value demand value≤current operation Current peak < running current peak value exceptional values, then the current machine performance of high voltage isolator be abnormality, defect type For tripping;
If be currently up current peak >=starting current peak value exceptional value, and current running current peak value >=running current peak Value exceptional value, then the current machine performance of high voltage isolator 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 When result of determination is attention state or abnormality, will be defeated as warning signal to machine performance and defect type result of determination Go out.
High voltage isolator machine performance proposed by the present invention is monitored and method for early warning, and its advantage is:
(1) high voltage isolator machine performance of the invention monitoring and method for early warning, principle are concisely reliable, by prison in real time Motor operating current when high voltage isolator separating brake or closing operation is surveyed, and is realized to resistance is operated during whole operation The comprehensive monitoring of situation of change, so as to defects such as timely discovering device bite, trippings, is that equipment state overhauling or state estimation are carried For effectively support;
(2) the inventive method is realized simply, being not required to be modified original equipment structure during enforcement, does not also increase original equipment multiple Miscellaneous degree;
(3) the inventive method possesses intelligent diagnostics and warning function, the current separating brake of high voltage isolator or closing operation knot Shu Hou, you can complete the real-time diagnosis of machine performance and the intelligent decision of defect type, send early warning in time, be prevented effectively from equipment Catastrophe failure occurs, and reduces economic loss and social influence.
Description of the drawings
Fig. 1 is the current amplitude envelope curve Characteristic Extraction schematic diagram being related in the inventive method.
Fig. 2 is the high voltage isolator Current mechanical state and defect type decision rule table being related in the inventive method.
Specific embodiment
High voltage isolator machine performance monitoring proposed by the present invention and method for early warning, comprise the following steps:
(1) operating current is run according to the motor of high voltage isolator, obtains the normal separating brake behaviour of high voltage isolator When making when the operating current curve or normal closing operation of motor motor operating current curve;
(2) process conversion is carried out to above-mentioned operating current curve, obtains decision threshold, detailed process is comprised the following steps:
(2-1) using low-pass filtering method, denoising is carried out to above-mentioned operating current curve, as motor works Current curve is usually AC signal of the frequency less than 1kHz, and the upper frequency limit of low-pass filtering typically takes 1kHz-10kHz;
(2-2) Hilbert transform is carried out to the operating current curve after above-mentioned denoising, obtains operating current curve Amplitude envelope curve;
(2-3) above-mentioned amplitude envelope curve is divided into two time intervals, as shown in figure 1, wherein the very first time is interval Length be x% × T, characterize high voltage isolator transient state startup stage, the such as T0 in figure, the length of the second time interval is then (100-x) % × T, characterizes high voltage isolator steady state operation phase, and the such as T1 in figure is carried from two time intervals respectively Obtaining current peak value, and the very first time interval current peak is defined as starting current peak value, the such as I0 in figure, the second time zone Between current peak be defined as running current peak value, the total duration of the I 1 such as in figure, wherein T for amplitude envelope curve, x takes Value scope is typically based on the version of high voltage isolator and the output determination of motor for the value of 5~15, x, Generally, high voltage isolator version is simpler, and motor output is bigger, and motor starting time is got over Short, then x values suitably should reduce;
(2-4) according to above-mentioned starting current peak value and running current peak value as reference value, given threshold is as follows:Start electricity Stream peak value × (1.2~1.5) are starting current peak value demand value, and starting current peak value × (2~3) are starting current peak value exception Value, running current peak value × (1.2~1.5) are running current peak value demand value, and running current peak value × (2~3) are operation electricity Stream peak value exceptional value, setting ratio value of the above-mentioned threshold value with respect to reference value, according to the simulation of common model high voltage isolator Depending on testing the motor working current value for measuring under bite and tripping defect situation, for specific model high_voltage isolation is opened Close, should be determined according to actual tests test value;
(3) the motor operating current for obtaining the current high voltage isolator sub-switching operation corresponding with step (1) is bent The motor operating current curve of line or current high voltage isolator closing operation;
(4) repeat step (2-1)~step (2-3), processes to the operating current curve of step (3), obtains high pressure Disconnecting switch is currently up current peak and current running current peak value;
(5) by above-mentioned high voltage isolator be currently up current peak and current running current peak value respectively with step (2-4) four threshold values are compared, and judge the current machine performance of high voltage isolator and defect type, as shown in Fig. 2 Concrete decision rule is as follows:
If be currently up current peak I0 < starting current peak value demand values, and 1 < operations of current running current peak I Current peak demand value, then the current machine performance of high voltage isolator is normal condition, and defect type is nothing;
If be currently up current peak I0 < starting current peak value demand values, and running current peak value demand value≤current fortune 1 < running current peak value exceptional values of row current peak I, then the current machine performance of high voltage isolator be attention state, defect Type is slight bite;
If be currently up current peak I0 < starting current peak value demand values, and 1 >=operation of current running current peak I Current peak exceptional value, then the current machine performance of high voltage isolator is abnormality, and defect type is serious bite;
If starting current peak value demand value≤be currently up current peak I0 < starting current peak value exceptional values, and current fortune 1 < running current peak value demand values of row current peak I, then the current machine performance of high voltage isolator be attention state, defect Type is slight bite;
If starting current peak value demand value≤be currently up current peak I0 < starting current peak value exceptional values, and run electricity Stream peak value demand value≤current 1 < running current peak value exceptional values of running current peak I, the then current machine of high voltage isolator Tool state is attention state, and defect type is slight bite;
If starting current peak value demand value≤be currently up current peak I0 < starting current peak value exceptional values, and current fortune Row current peak I 1 >=running current peak value exceptional values, then the current machine performance of high voltage isolator be abnormality, defect Type is serious bite;
If be currently up current peak I0 >=starting current peak value exceptional value, and 1 < operations of current running current peak I Current peak demand value, then the current machine performance of high voltage isolator is abnormality, and defect type is tripping;
If be currently up current peak I0 >=starting current peak value exceptional value, and running current peak value demand value≤current fortune 1 < running current peak value exceptional values of row current peak I, then the current machine performance of high voltage isolator be abnormality, defect Type is tripping;
If be currently up current peak I0 >=starting current peak value exceptional value, and 1 >=operation of current running current peak I Current peak exceptional value, then the current machine performance of high voltage isolator 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 When result of determination is attention state or abnormality, will be defeated as warning signal to machine performance and defect type result of determination Go out, if high voltage isolator belongs to equipment in intelligent substation, generally need to be by above-mentioned warning signal with IEC61850 Standards Codes Transformer station's comprehensive monitoring system is arrived in long-range output.

Claims (1)

1. a kind of high voltage isolator machine performance is monitored and method for early warning, it is characterised in that the method is comprised the following steps:
(1) operating current is run according to the motor of high voltage isolator, when obtaining the normal sub-switching operation of high voltage isolator The operating current curve of motor when the operating current curve of motor or normal closing operation;
(2) process conversion is carried out to above-mentioned operating current curve, obtains decision threshold, detailed process is comprised the following steps:
(2-1) using low-pass filtering method, denoising is carried out to above-mentioned operating current curve;
(2-2) Hilbert transform is carried out to the operating current curve after above-mentioned denoising, obtains the width of operating current curve Value envelope 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 extracts current peak from two time intervals respectively then for (100-x) % × T, and by first The current peak of time interval is defined as starting current peak value, and the current peak of the second time interval is defined as running current peak Value, total durations of the wherein T for amplitude envelope curve, the span of x is 5~15;
(2-4) according to above-mentioned starting current peak value and running current peak value as reference value, given threshold is as follows:Starting current peak Value × (1.2~1.5) are starting current peak value demand value, and 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) obtain corresponding with step (1) the current high voltage isolator sub-switching operation motor operating current curve or The motor operating current curve of current high voltage isolator closing operation;
(4) repeat step (2-1)~step (2-3), processes to the operating current curve of step (3), obtains high_voltage isolation Switched is currently up current peak and current running current peak value;
(5) by above-mentioned high voltage isolator be currently up current peak and current running current peak value respectively with step (2-4) Four threshold values be compared, judge the current machine performance of high voltage isolator and defect type, concrete decision rule is such as Under:
If be currently up current peak < starting current peak value demand values, and current running current peak L T.LT.LT running current peak value note Meaning value, then the current machine performance of high voltage isolator is normal condition, and defect type is nothing;
If be currently up current peak < starting current peak value demand values, and running current peak value demand value≤current running current Peak L T.LT.LT running current peak value exceptional value, then the current machine performance of high voltage isolator is attention state, and defect type is light Microcaloire is puckery;
If being currently up current peak < starting current peak value demand values, and current running current peak value >=running current peak value being different Constant value, then the current machine performance of high voltage isolator is abnormality, and defect type is serious bite;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and current running current Peak L T.LT.LT running current peak value demand value, then the current machine performance of high voltage isolator is attention state, and defect type is light Microcaloire is puckery;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and running current peak value Demand value≤current running current peak L T.LT.LT running current peak value exceptional value, then the current machine performance of high voltage isolator is note Meaning state, defect type are slight bite;
If starting current peak value demand value≤be currently up current peak < starting current peak value exceptional values, and current running current Peak value >=running current peak value exceptional value, then the current machine performance of high voltage isolator is abnormality, and defect type is tight Heavy truck is puckery;
If be currently up current peak >=starting current peak value exceptional value, and current running current peak L T.LT.LT running current peak value note Meaning value, then the current machine performance of high voltage isolator is abnormality, and defect type is tripping;
If be currently up current peak >=starting current peak value exceptional value, and running current peak value demand value≤current running current Peak L T.LT.LT running current peak value exceptional value, then the current machine performance of high voltage isolator is abnormality, and defect type is to refuse Dynamic;
If being currently up current peak >=starting current peak value exceptional value, and current running current peak value >=running current peak value being different Constant value, then the current machine performance of high voltage isolator 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 sentencing Result is determined for attention state or during abnormality, machine performance and defect type result of determination are exported as warning signal.
CN201410676399.5A 2014-11-21 2014-11-21 A kind of high voltage isolator machine performance monitoring and method for early warning CN104407286B (en)

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