CN105242182B - Based on SF6The run switch equipment internal flaw judgment method of gas decomposition product - Google Patents

Based on SF6The run switch equipment internal flaw judgment method of gas decomposition product Download PDF

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CN105242182B
CN105242182B CN201510706009.9A CN201510706009A CN105242182B CN 105242182 B CN105242182 B CN 105242182B CN 201510706009 A CN201510706009 A CN 201510706009A CN 105242182 B CN105242182 B CN 105242182B
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gas
defect
characteristic parameter
run switch
characteristic
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CN105242182A (en
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颜湘莲
王承玉
季严松
李志兵
王浩
刘北阳
曹德新
刘焱
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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Abstract

The present invention provides one kind to be based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, including step 1: with the SF of gas-chromatography detection system detection run switch equipment6Gas decomposition product;Step 2: statistics SF6The testing result of gas decomposition product, determines SF6The characteristic gas of gas decomposition product and its characteristic parameter of this feature gas;Step 3: the internal flaw type of run switch equipment is judged according to the characteristic parameter.Compared with prior art, provided by the invention a kind of based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, establishes SF under distinct device defect6The characteristic parameter judgment method of gas decomposition product improves the reliability and validity of the judgement of switchgear internal flaw.

Description

Based on SF6The run switch equipment internal flaw judgment method of gas decomposition product
Technical field
The present invention relates to electrical equipment detection technique fields, and in particular to one kind is based on SF6The operation of gas decomposition product Switchgear internal flaw judgment method.
Background technique
In switchgear During Process of Long-term Operation, SF6 gas-insulated switchgear emerged in operation electric discharge, overheat the defects of, Influence equipment safety operation.Field experience shows that SF6 gas decomposition product detection means can effectively detect equipment internal flaw, Need to propose that effective equipment deficiency judgment method, timely discovering device defect avoid the occurrence of equipment fault and cause accident.
There are certain restrictions for the traditional electrical equipment detection means of switchgear and partial discharge detection method, it is difficult to have in time Effect detects equipment internal flaw, and for the detection and judgement of run switch equipment internal flaw, the main part of carrying out in scene is put Electricity or SF6 gas decomposition product live detection.
(1) use Partial Discharge Detecting Technology, can to equipment inside occur corona discharge, spark discharge, electrically conductive particles, Insulation is diagnosed along the defects of face and internal air gap, is proposed pulse current, ultrasonic wave and superfrequency method and is detected different defects The feature Partial discharge signal and diagnosis principle of development.
In metal tip, free metal particle, under the typical partial discharge defect such as face, floating potential and insulating inner air gap, Variation, the rule of development of pulse current method PRPD map, superfrequency PRPS map and ultrasonic wave characteristic index map have been obtained, has been seen 2~table of table 6.View is extracted in the variation of the parameters such as partial discharge amount, superfrequency phase distribution, ultrasonic wave characteristic index, office can be characterized Portion's discharge defect development in starting voltage to breakdown voltage section characteristic parameter changing rule, for judge switchgear exist Operation latency defect.But partial discharge detection method cannot judge Arcing fault existing for equipment inside, it is also difficult to examine The overheating defect of equipment is measured, and the electromagnetic interference influence of the examined environment of partial discharge detection is larger, it is difficult to quantitative result is obtained, There are still deficiencies to be judged to equipment internal flaw.
Pulse current method needs external capacitor and detects the Partial discharge signal that impedance measuring equipment generates, only in use for laboratory in mark The view of shelf depreciation is determined in partial discharge amount, it is impossible to be used in the partial discharge defects detection of live running equipment.
Superfrequency method requires equipment under test to have the Insulating gap that can give off electromagnetic wave, such as disc insulator, observation Otherwise window etc. should install in advance built-in extra-high video sensor inside equipment under test.Further, since electromagnetic wave propagation speed is fast And decaying it is smaller, the accurate positioning of partial discharge defect generally use high speed digital oscilloscope acquisition, to detection signal be filtered with It obtains envelope or compares the ultrahigh-frequency signal power of different parts, realize that partial discharge defect location, detection accuracy are poor.
Ultrasonic Detection Method is poor to insulating inner electric discharge sensitivity, only more sensitive to the discharge defect of short distance, and easily It is influenced by ambient noise, especially when there are when mechanical oscillation or electric and magnetic oscillation for equipment under test itself, it will to ultrasonic wave Testing result causes large effect, even can cause to judge by accident when serious.In addition, because solid insulating material is to ultrasonic signal Propagation attenuation is larger, should not be used in the disc insulator discharge defect of detection SF6 switchgear.
(2) judge that equipment runs internal flaw using SF6 gaseous state live detection technology, formulated State Grid Corporation of China Company standard Q/GDW 1896-2013 " SF6 gas decomposition product detection technique field application directive/guide ", proposes gas-insulated and sets Detected components, technical indicator and the evaluation result of standby operating status judgement, are shown in Table 7.
If detecting, SF6 gas decomposition product SO2 or H2S content occur abnormal in equipment, should decompose in conjunction with SF6 gas and produce CO, CF4 content of object and the variation of other state parameters, equipment electrical characteristic, operating condition etc. carry out synthesis to equipment state and examine It is disconnected.
SF6 gas decomposition product live detection method has formulated the field application directive/guide of this technology, proposes equipment shape The SF6 gas decomposition product one-component content range of state judgement.Since equipment operating condition is more complex, SF6 gas, which decomposes, to be produced Analyte detection result is related with environmental condition, device structure etc. by multifactor impact, as the air content of gas, water content and The situations such as size, the folding electric current of equipment gas chamber, will be a greater impact to SF6 gas decomposition product component and its content in equipment.It can See, SF6 gas decomposition product one-component content absolute value, which is difficult to use in, judges equipment deficiency or operating status, sets at the scene The operability of standby live detection or state-detection is poor, it is necessary to Improving Equipment state judge index.
Accordingly, it is desirable to provide a kind of characteristic parameter variation range that can be obtained under each defect mode, lacks equipment inside The method for being trapped into row judgement improves the reliability and validity of equipment deficiency judgement.
Summary of the invention
In order to meet the needs of the prior art, the present invention provides one kind to be based on SF6The run switch of gas decomposition product Equipment internal flaw judgment method.
The technical scheme is that
The described method includes:
Step 1: the SF of the run switch equipment is detected with gas-chromatography detection system6Gas decomposition product, the gas Phase chromatographic detection system includes gas chromatograph and the first helium ion detector and the second helium ion detector;
The first helium ion detector, for detecting the SF comprising carbide6Gas decomposition product;Second helium from Sub- detector, for detecting the SF comprising sulfide6Gas decomposition product;
Step 2: counting the SF6The testing result of gas decomposition product, determines SF6The characteristic gas of gas decomposition product, And its characteristic parameter of this feature gas;
The characteristic gas includes the SF6The maximum gas of constituent content and constituent content in gas decomposition product Close to the gas of the maximum level;The characteristic parameter is characterized the content ratio of gas;
Step 3: the internal flaw type of the run switch equipment, the run switch are judged according to the characteristic parameter The internal flaw type of equipment includes arc discharge defect, abnormal overheating defect and local discharge defect;
When the characteristic gas includes SO2And H2When S, there are arc discharge defect or abnormal overheats for run switch equipment Defect;The characteristic parameter of the arc discharge defect and abnormal overheating defect is SO2/H2S;
When the characteristic gas includes SOF2、SO2And SO2F2When, there are shelf depreciation defects for run switch equipment;It is described The characteristic parameter of shelf depreciation defect is (SOF2+SO2)/SO2F2
Preferably, in step 3, judging the run switch equipment, there are the sides of arc discharge defect and abnormal overheating defect Method are as follows:
When the characteristic gas includes SO2、H2S and CO, and characteristic parameter SO2/H2When the value of S is 1~5, run switch is set Standby there are arc discharge defects: if characteristic parameter SO2/H2The value of S is 1~3, then there is the arc discharge defect of low energy, if feature Parameter SO2/H2When the value of S is 4~5, then there is the arc discharge defect of high energy;
When the characteristic gas includes SO2、H2S、CF4And CO2, and characteristic parameter SO2/H2When the value of S is 7~25, then transport There is abnormal heat spot in the metal connecting piece of row switchgear;
When the characteristic gas includes SO2、H2S、CF4And CS2Or including SO2、H2S、CF4、CO2And CS2, and feature is joined Measure SO2/H2When the value of S is 7~25, then there is abnormal heat spot in the insulating materials of run switch equipment;
Preferably, in step 3, judge that there are the methods of shelf depreciation defect for the run switch equipment are as follows:
As characteristic parameter (SOF2+SO2)/SO2F2Value less than 1 when, there are the parts of low energy to put for the run switch equipment Electric defect;As characteristic parameter (SOF2+SO2)/SO2F2Value be 1~5 when, there are the parts of high energy to put for the run switch equipment Electric defect;
Preferably, the appraisal procedure of the shelf depreciation defect are as follows:
Step (1): the decomposition yield of characteristic gas is calculated;
Step (2): according to the content for decomposing yield and characteristic gas, accumulative putting inside switch running equipment is calculated Electric flux;
Step (3): calculating the discharge power of shelf depreciation, and the discharge power is impulse discharge energy and pulse recurrence rate Product;
Step (4): shelf depreciation defect is assessed according to the accumulated discharge energy and discharge power.
Compared with the immediate prior art, the excellent effect of the present invention is that:
1, provided by the invention a kind of based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, Using SF6The characteristic parameter that the content ratio of characteristic gas judges as switchgear defect type in gas decomposition product, The relevance of the influence factors such as remaining device structure, operating condition and environmental condition is smaller;
2, provided by the invention a kind of based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, It, can be with electric arc, shelf depreciation and the hair of appearance inside effective district subset based on the characteristic parameter value range under different defects Thermal defect has obtained the characteristic parameter variation tendency during development of defects, for the judgement of equipment internal flaw type and its defect Development provides foundation;
3, provided by the invention a kind of based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, Establish SF under distinct device defect6The characteristic parameter judgment method of gas decomposition product, improves switchgear internal flaw The reliability and validity of judgement.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1: a kind of in the embodiment of the present invention to be based on SF6The run switch equipment internal flaw judgement side of gas decomposition product Method flow chart;
Fig. 2: the connection schematic diagram of gas-chromatography detection system detection run switch equipment in the embodiment of the present invention;
Fig. 3: the SF that the first helium ion detector detects in the embodiment of the present invention6Gas decomposition product typical case's chromatographic peak;
Fig. 4: the SF that the second helium ion detector detects in the embodiment of the present invention6Gas decomposition product typical case's chromatographic peak;
Fig. 5: characteristic parameter distribution map in the arc discharge defect of low energy in the embodiment of the present invention;
Fig. 6: characteristic parameter distribution map in the arc discharge defect of high energy in the embodiment of the present invention;
Fig. 7: SO in arc discharge defect in the embodiment of the present invention2/H2S content ratio distribution map;
Fig. 8: influence schematic diagram of the temperature to characteristic parameter in abnormal overheating defect in the embodiment of the present invention;
Fig. 9: influence schematic diagram of the air pressure to characteristic parameter in abnormal overheating defect in the embodiment of the present invention;
Figure 10: influence schematic diagram of the adsorbent to characteristic parameter in abnormal overheating defect in the embodiment of the present invention;
Figure 11: the SO of arc discharge defect and abnormal heating defect in the embodiment of the present invention2/H2S content ratio compares signal Figure;
Figure 12: (SOF in shelf depreciation defect in the embodiment of the present invention2+SO2)/SO2F2Content ratio schematic diagram;
Figure 13: the estimation flow schematic diagram of shelf depreciation defect in the embodiment of the present invention;
Wherein, 1: needle valve;2: pressure sensor;3: the first quantity tubes;4: the second quantity tubes;5: third quantity tube;6: First chromatographic column;7: the second chromatographic columns;8: third chromatographic column;9: the first ten-way valves;10: the first six-way valves;11: the two ten is logical Valve;12: the second six-way valves;13: the four chromatographic columns;14: the five chromatographic columns;15: the six chromatographic columns;16: the first helium ion detections Device;17: the second helium ion detectors.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
It is provided by the invention a kind of based on SF6The reality of the run switch equipment internal flaw judgment method of gas decomposition product It applies for example shown in Fig. 1, specifically:
One, with the SF of gas-chromatography detection system detection run switch equipment6Gas decomposition product.
As shown in Fig. 2, gas-chromatography detection system includes gas chromatograph and the first helium ion detector 16 and the second helium Ion detector 17.Gas-chromatography detection system is capable of detecting when SOF in the present embodiment2、SO2F2、SO2、H2S、CO、CF4、CO2 And CS2Equal SF6Gas decomposition product component carries out SF to the run switch equipment of doubtful existing defects6Gas decomposition product electrification Detection.Wherein,
First helium ion detector PDD1, for detecting the SF comprising carbide6Gas decomposition product;
Second helium ion detector PDD2, for detecting the SF comprising sulfide6Gas decomposition product.
The SF that the first helium ion detector detects in the present embodiment6Typical chromatographic peak such as Fig. 3 institute of gas decomposition product Show, the SF that the second helium ion detector detects6The typical chromatographic peak of gas decomposition product is as shown in figure 4, gas with various component The retention time of chromatographic peak is as shown in table 1:
Table 1
Two, SF is counted6The testing result of gas decomposition product, determines SF6The characteristic gas of gas decomposition product, and its should The characteristic parameter of characteristic gas.
It includes SF that characteristic gas is set in the present embodiment6The maximum gas of constituent content and group in gas decomposition product Divide content close to the gas of the maximum level;Characteristic parameter is characterized the content ratio of gas.
Three, the internal flaw type of run switch equipment is judged according to characteristic parameter.
The internal flaw type of run switch equipment includes that arc discharge defect, abnormal overheating defect and shelf depreciation lack It falls into.The judgment principle of all types of curves are as follows:
1.: arc discharge defect and abnormal overheating defect
When characteristic gas includes SO2And H2When S, there are arc discharge defect or abnormal overheating defects for run switch equipment.
The characteristic parameter of arc discharge defect and abnormal overheating defect is SO2/H2S.Wherein, SO2/H2The value of S contains with moisture Amount, SF6The relevance of air pressure, electrode material and adsorbent is smaller, therefore selects SO2/H2The value of S is as arc discharge and exception The characteristic parameter of overheat.
2.: shelf depreciation defect
When characteristic gas includes SOF2、SO2And SO2F2When, there are shelf depreciation defects for run switch equipment.
The characteristic parameter of shelf depreciation defect is (SOF2+SO2)/SO2F2
1, judging run switch equipment, there are the methods of arc discharge defect and abnormal overheating defect are as follows:
(1) arc discharge defect
When characteristic gas includes SO2、H2S and CO, and characteristic parameter SO2/H2When the value of S is 1~5, run switch equipment is deposited In arc discharge defect:
It is distinguished in the present embodiment with arc energy 10kJ, is that the electric arc of high energy is put if discharge energy is greater than 10kJ Electricity, if discharge energy less than the arc discharge for if 10kJ being low energy.Wherein, arc discharge the characteristic parameter distribution such as Fig. 5 of low energy It is shown, the characteristic parameter point of " Δ " characterization low energy arc discharge in Fig. 5;The arc discharge characteristic parameter of high energy is distributed such as Fig. 6 institute Show, the characteristic parameter point of " ◆ " characterization high energy arc electric discharge in Fig. 6.When cannot distinguish between arc discharge energy, point of characteristic parameter Cloth is as shown in fig. 7, characteristic parameter SO2/H2The value of S is the characteristic parameter point that " " characterizes arc discharge in 1~5, Fig. 7.
1.: if characteristic parameter SO2/H2The value of S is 1~3, then there is the arc discharge defect of low energy;
2.: if characteristic parameter SO2/H2When the value of S is 4~5, then there is the arc discharge defect of high energy.
(2) abnormal overheating defect
When characteristic gas includes SO2、H2S、CF4And CO2, and characteristic parameter (SOF2+SO2)/SO2F2Value be 7~25 when, Then there is abnormal heat spot in the metal connecting piece of run switch equipment.
When characteristic gas includes SO2、H2S、CF4And CS2, and characteristic parameter (SOF2+SO2)/SO2F2Value be 7~25 when, Then there is abnormal heat spot in the insulating materials of run switch equipment.
When characteristic gas includes SO2、H2S、CF4、CO2And CS2, and characteristic parameter (SOF2+SO2)/SO2F2Value be 7~ When 25, then there is abnormal heat spot in the insulating materials of run switch equipment.
In the present embodiment in the case where there is adsorbent, heating time, the influence to characteristic parameter was as shown in figure 8, in Fig. 8 " ◆ " is characteristic parameter point of the abnormal overheating defect at 250 DEG C, and " " is characteristic parameter of the abnormal overheating defect at 265 DEG C Point, " Δ " are characteristic parameter point of the abnormal overheating defect at 270 DEG C, and "-" is feature ginseng of the abnormal overheating defect at 280 DEG C Amount point.The influence of air pressure and temperature to characteristic parameter is as shown in figure 9, " ◆ " is abnormal overheating defect at 0.25MPa in Fig. 9 Characteristic parameter point, " " are characteristic parameter point of the abnormal overheating defect at 0.35MPa, and " Δ " is that abnormal overheating defect exists Characteristic parameter point under 0.45MPa.The distribution of heat symptom-complex parameter is as shown in Figure 10 in the case where no adsorbent, Tu10Zhong, " Δ " is the characteristic parameter point that abnormal overheating defect has adsorbent, " ◆ " be abnormal overheating defect without adsorbent when characteristic parameter Point.Influence by the available adsorbent of Fig. 8-10 to characteristic parameter is smaller.
To choosing SO in the test of arc discharge defect and abnormal heating defect in the present embodiment2/H2The value of S is as event Characteristic parameter under barrier mode, to the characteristic parameter under good total failare defect relatively after result it is as shown in figure 11, Figure 11 " 1 " High energy arc discharge defect is represented, " 2 " represent low energy arc discharge defect, and " 3 " represent abnormal overheating defect, and " " is high energy electricity The SO2/H2S content ratio point of arc discharge defect, " Δ " are the SO2/H2S content ratio point of high energy arc discharge defect, " " For the SO2/H2S content ratio point of abnormal overheating defect.Less than 5, arc energy of falling asleep reduces special characteristic parameter when arc discharge Parameter is levied to increase;When abnormal heating, characteristic parameter is 7~25.
2, judging run switch equipment, there are the methods of shelf depreciation defect are as follows:
As characteristic parameter (SOF2+SO2)/SO2F2Value less than 1 when, run switch equipment there are the shelf depreciation of low energy lack It falls into;
As characteristic parameter (SOF2+SO2)/SO2F2Value be 1~5 when, there are the shelf depreciations of high energy for run switch equipment Defect.
Characteristic parameter (SOF when shelf depreciation defect in the present embodiment2+SO2)/SO2F2Distribution it is as shown in figure 12, Figure 12 In " O " be spark discharge (SOF2+SO2)/SO2F2Content ratio point, " " are (SOF of corona discharge2+SO2)/SO2F2Content Ratio point.Wherein, under corona discharge, characteristic parameter is distributed between 0~1;Under floating potential spark discharge, characteristic parameter distribution Between 1~5;With the increase of shelf depreciation energy, SOF2Content account for main specific gravity.
3, with the increase of partial discharge intensity, characteristic parameter increases.If the type of shelf depreciation is converted by corona discharge When for spark discharge, the value of characteristic parameter is increased above 1 from less than 1.When arc fault occurs, the value of characteristic parameter reaches 10 or more.Under identical discharge defect type, discharge energy increases, and characteristic parameter is consequently increased.When run switch equipment Shelf depreciation development of defects expand or it is serious when, characteristic parameter also will increase, wherein SOF2+SO2Content in SF6Gas Ratio in the total amount of decomposition product also will increase, due to SO2Almost all source and SOF2Hydrolysis generates, therefore detects SOF2+SO2When increase, the SOF that shelf depreciation defect generates can be confirmed2Content rises.
Utilize the SF detected6The method that the content of gas decomposition product and yield assess local discharge defect is such as Shown in Figure 13, specifically:
(1) the decomposition yield of characteristic gas is calculated;
(2) according to the content for decomposing yield and characteristic gas, the accumulated discharge energy inside switch running equipment is calculated;
(3) discharge power of shelf depreciation is calculated, the discharge power is multiplying for impulse discharge energy and pulse recurrence rate Product;
(4) shelf depreciation defect is assessed according to the accumulated discharge energy and discharge power.
Subordinate list:
1.: the feature Partial discharge signal changing rule of GIS metal tip development of defects is as shown in Figure 2:
Table 2
Wherein, positive and negative half-wave symmetry value in 0,0.25,0.5,0.75,1 indicates positive and negative half-wave discharge signal symmetry Degree, 0 indicates that only discharge signal occurs in half-wave, and 1 indicates that full symmetric discharge signal occurs in positive and negative half-wave;/ indicate no inspection Survey result.
2.: the feature Partial discharge signal changing rule of GIS free metal particle defects development is as shown in table 3:
Table 3
3.: the feature Partial discharge signal changing rule of GIS creeping discharge development of defects is as shown in table 4:
Table 4
4.: the feature Partial discharge signal changing rule of GIS floating potential discharge development of defects is as shown in table 5:
Table 5
5.: the feature Partial discharge signal changing rule of GIS insulating inner bubble-discharge development of defects is as shown in table 6:
Table 6
6.: SF6The gas component of gas decomposition product, Testing index and evaluation result are as shown in table 7:
Table 7
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities Apply example.Based on the embodiment in the application, this field is composed logical technical staff and is obtained without making creative work Every other embodiment, shall fall in the protection scope of this application.

Claims (3)

1. one kind is based on SF6The run switch equipment internal flaw judgment method of gas decomposition product, which is characterized in that the side Method includes:
Step 1: the SF of the run switch equipment is detected with gas-chromatography detection system6Gas decomposition product, the gas-chromatography Detection system includes gas chromatograph and the first helium ion detector and the second helium ion detector;
The first helium ion detector, for detecting the SF comprising carbide6Gas decomposition product;The second helium ion inspection Device is surveyed, for detecting the SF comprising sulfide6Gas decomposition product;
Step 2: counting the SF6The testing result of gas decomposition product, determines SF6The characteristic gas of gas decomposition product, and its The characteristic parameter of this feature gas;
The characteristic gas includes the SF6The maximum gas of constituent content and constituent content, which approach, in gas decomposition product is somebody's turn to do The gas of maximum level;The characteristic parameter is characterized the content ratio of gas;
Step 3: the internal flaw type of the run switch equipment, the run switch equipment are judged according to the characteristic parameter Internal flaw type include arc discharge defect, abnormal overheating defect and local discharge defect;
When the characteristic gas includes SO2And H2When S, there are arc discharge defect or abnormal overheating defects for run switch equipment; The characteristic parameter of the arc discharge defect and abnormal overheating defect is SO2/H2S;
When the characteristic gas includes SOF2、SO2And SO2F2When, there are shelf depreciation defects for run switch equipment;It puts the part The characteristic parameter of electric defect is (SOF2+SO2)/SO2F2
In step 3, judge that there are the methods of shelf depreciation defect for the run switch equipment are as follows:
As characteristic parameter (SOF2+SO2)/SO2F2Value less than 1 when, the run switch equipment there are the shelf depreciation of low energy lack It falls into;As characteristic parameter (SOF2+SO2)/SO2F2Value be 1~5 when, the run switch equipment there are the shelf depreciation of high energy lack It falls into.
2. the method as described in claim 1, which is characterized in that in step 3, judge that there are electric arcs to put for the run switch equipment The method of electric defect and abnormal overheating defect are as follows:
When the characteristic gas includes SO2、H2S and CO, and characteristic parameter SO2/H2When the value of S is 1~5, run switch equipment is deposited In arc discharge defect: if characteristic parameter SO2/H2The value of S is 1~3, then there is the arc discharge defect of low energy, if characteristic parameter SO2/H2When the value of S is 4~5, then there is the arc discharge defect of high energy;
When the characteristic gas includes SO2、H2S、CF4And CO2, and characteristic parameter SO2/H2When the value of S is 7~25, then operation is opened There is abnormal heat spot in the metal connecting piece for closing equipment;
When the characteristic gas includes SO2、H2S、CF4And CS2Or including SO2、H2S、CF4、CO2And CS2, and characteristic parameter SO2/ H2When the value of S is 7~25, then there is abnormal heat spot in the insulating materials of run switch equipment.
3. the method as described in claim 1, which is characterized in that the appraisal procedure of the shelf depreciation defect are as follows:
Step (1): the decomposition yield of characteristic gas is calculated;
Step (2): according to the content for decomposing yield and characteristic gas, the accumulated discharge energy inside switch running equipment is calculated Amount;
Step (3): calculating the discharge power of shelf depreciation, and the discharge power is multiplying for impulse discharge energy and pulse recurrence rate Product;
Step (4): shelf depreciation defect is assessed according to the accumulated discharge energy and discharge power.
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