CN115542145A - SF (sulfur hexafluoride) 6 Disassembling and checking method for column type circuit breaker - Google Patents

SF (sulfur hexafluoride) 6 Disassembling and checking method for column type circuit breaker Download PDF

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Publication number
CN115542145A
CN115542145A CN202211401973.7A CN202211401973A CN115542145A CN 115542145 A CN115542145 A CN 115542145A CN 202211401973 A CN202211401973 A CN 202211401973A CN 115542145 A CN115542145 A CN 115542145A
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China
Prior art keywords
circuit breaker
disassembling
contact part
checking
disassembled
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Inventor
王琼
车传强
赵磊
窦冰杰
刘天宇
冯汝明
种佳丽
李奇
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Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
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Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
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Priority to CN202211401973.7A priority Critical patent/CN115542145A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor

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  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The invention provides an SF 6 A column type breaker disassembling and checking method belongs to the technical field of electrical engineering. The disassembling and checking method is based on SF 6 The main body structure of the column type circuit breaker is characterized in that a disassembling and checking method comprising the steps of acoustic signal live detection, disassembling and checking cleanliness, loop resistance test, stroke measurement, arc extinguish chamber disassembling and checking, sample detection and the like is provided. According to the method of the invention, SF can be disassembled faster 6 The column type circuit breaker improves the disassembly efficiency; meanwhile, the checking position and key points are mentioned in each step of disassembling, so that the technical guidance is strong, and the defect position searching and defect cause verification by electric power technicians are facilitated.

Description

SF (sulfur hexafluoride) 6 Disassembling and checking column type circuit breakerMethod
Technical Field
The invention belongs to the field of electrical engineering, and relates to SF 6 A column type breaker disassembling and checking method.
Background
SF 6 The circuit breaker has the advantages of high fracture withstand voltage, good breaking performance, long service life, stable operation and the like, and is widely applied to a power system, wherein SF 6 The column type circuit breaker is mainly applied to systems with voltage levels of 220kV and below. SF in operation according to test period required by condition maintenance regulations 6 For the column circuit breaker, a small amount of tests and detection such as loop insulation resistance measurement, loop resistance measurement, gas test and the like need to be carried out on the body of the column circuit breaker, and the cycle of the column circuit breaker is three years. SF 6 The high reliability of the column circuit breaker is the basic guarantee of its excellent maintenance-free characteristics.
SF 6 The maintenance-free characteristic of the column type circuit breaker reduces the workload of field operation and maintenance and test on one hand, but also reduces the chances of contacting and knowing the equipment result by power technicians to a certain extent, so that the embarrassment that the technicians find that suspected defects are left out, the equipment structure is not familiar, and the accurate simulation analysis cannot be carried out is frequently caused. For example, several SF's have appeared in recent years 6 The events such as the displacement of key parts caused by abnormal sound and transportation impact of the column type circuit breaker bring about not small potential safety hazards to field operation.
Familiarity with SF 6 The equipment structure of the column type circuit breaker, according to the characteristic of the equipment structure, inspects the possible defect position and abnormal performance, undoubtedly guarantees the equipment disassembly quality and verifies SF 6 An effective means for the cause of the defect of the column breaker. The disassembling steps are not standard enough, the disassembling process is not smooth, and the investigation is very likely to have no result.
In view of the above, the present invention provides an SF 6 A disassembling and checking method for column type circuit breaker mainly aims at SF 6 The abnormal sound defect of the column type circuit breaker provides a relatively detailed troubleshooting key point for standardizing SF 6 Disassembling step of column type breaker, and determining its investigation position to improve SF 6 Correctness of abnormality diagnosis of column type circuit breakerAnd accuracy.
Disclosure of Invention
The object of the invention is to specify SF 6 Disassembling step of column circuit breaker, especially for SF 6 The abnormal sound defect of the column type circuit breaker provides a relatively detailed investigation key point for accurately verifying SF 6 The defects of abnormal sound, component displacement and the like of the column type circuit breaker provide powerful support.
The object of the invention is thus achieved. The invention provides an SF 6 Disassembling and checking method of column type circuit breaker, and SF 6 Column circuit breaker refers to SF with abnormal sound defect in operation 6 The body part of the column type circuit breaker, this body part is called the circuit breaker to be disassembled, the disassembling and checking method includes the following steps:
step 1, acquiring structural information and factory information of a circuit breaker to be disassembled;
step 2, develop the electrified detection of acoustic signal before disassembling the circuit breaker, include:
standing the gas-filled SF 6 The column circuit breaker is fixed on a test bracket, keeps the ground insulation distance not less than 2.5m, and carries out an alternating current withstand voltage test with the external test voltage of SF 6 80% of the outgoing AC test voltage of the column type circuit breaker, and recording the AC withstand voltage test result;
after the alternating-current withstand voltage test is finished and the alternating-current withstand voltage test is discharged, a sensor of the ultrasonic electrified detection tester is attached to the crank arm box; step-wise raising the applied test voltage to SF 6 After the column circuit breaker operates the phase voltage, keeping the pressure application time to be not less than 10min, and recording an acoustic signal in the pressure application process by using an ultrasonic electrified detection tester;
step 3, separating the upper section and the lower section of the circuit breaker to be disassembled
Unscrewing a connecting bolt of the middle connecting part of the circuit breaker to be disassembled, separating an upper section of the porcelain sleeve from a lower section of the porcelain sleeve, and enabling a piston connecting rod to be visible;
checking whether the locking pin arranged on the upper side of the piston connecting rod is loosened or not and whether a discharge trace exists or not and recording;
dismantling the upper side locking pin and the piston connecting rod to complete the separation of the upper section and the lower section of the circuit breaker to be disassembled;
step 4, disassembling and checking the next section
Unscrewing connecting bolts of the crank arm box and the lower section of the porcelain sleeve, and extracting the crank arm box and an insulating pull rod connected with the crank arm box from the lower section of the porcelain sleeve integrally;
checking whether the surface of the insulating pull rod is smooth or dirty, checking whether a crank arm joint and a lower side locking pin in a crank arm box are loosened or not, and recording whether discharge traces exist or not;
checking the cleanliness of the inner wall of the next section of porcelain bushing and the cleanliness of the inner wall of the crank arm box, specifically, checking whether insulating material chips and metal particles are attached to the inner wall in a chipless paper towel wiping mode, and if so, sampling and storing;
step 5, testing loop resistance
Adjusting the arc extinguish chamber to a switching-on position, measuring the loop resistance of the circuit breaker to be disassembled, and recording the loop resistance test result;
step 6, measuring the stroke
Measuring the stroke of the circuit breaker to be disassembled, judging whether the circuit breaker exceeds the stroke or not, and recording a test result;
step 7, disassembling and examining arc extinguish chamber
The arc extinguish chamber is arranged on the SF 6 The inner cavity of the upper section of the column type circuit breaker consists of a static contact part and a moving contact part;
step 7.1, separating the static contact part and the moving contact part
Firstly, vertically placing an upper section, opening a flange bolt at the upper part of the upper section, then using a top crane to lift out a static contact part, horizontally placing the upper section, and pulling out a movable contact part along the horizontal direction;
after the static contact part and the moving contact part are separated in sequence, the cleanness of the inner wall of the upper section of the porcelain sleeve is checked, whether insulating material chips and metal particles are attached to the inner wall of the upper section of the porcelain sleeve is checked in a mode of wiping the inner wall by using a chipless paper towel, and if yes, sampling and retaining are carried out;
step 7.2, the static contact part is checked
The adsorbent at the top end of the static contact part is removed, the internal structure of the static contact part can be obtained through peeping, the static contact part is of a double-layer cylindrical concentric structure, the main static contact is installed on the inner surface of the outer cylinder, and the arc static contact is installed at the geometric center of the inner cylinder;
checking whether each part in the static contact part has dislocation and abrasion, checking whether the arc static contact is ablated or not, and checking whether the surface of the arc static contact has attached powder or not, if so, sampling, sealing and retaining;
step 7.3, disassembling and inspecting the moving contact part
Firstly, inspecting a shielding cover on the upper side of a nozzle of a movable contact part, specifically, inspecting whether attached powder exists on the inner surface of the shielding cover, inspecting whether attached powder exists on the outer surface and the inner hole surface of a polytetrafluoroethylene nozzle at the upper end of an arc movable contact in the shielding cover, inspecting whether ablation traces exist on the inner surface and the outer surface of the polytetrafluoroethylene nozzle, and sampling, sealing and retaining the powder attached to the surface of the part;
secondly, recording the contact surface of the air cylinder and the active contact as a position A, recording the top end surface of the air cylinder as a position B, and further disassembling and checking the movable contact part;
disassembling the movable contact part into an upper part and a lower part from the position A, wherein the upper end of the inner part of the lower part is provided with a driving contact in a surrounding manner, and whether the driving contact deviates or not is checked; secondly, disassembling the upper part of the movable contact part (14) after disassembly and separation at the position B, specifically, integrally pulling the arc movable contact and the nozzle out of the air cylinder, and then unscrewing a fixing screw to pull the arc movable contact out of the nozzle, so that the disassembly of the parts of the movable contact part is completed; in the disassembly process, whether dislocation or offset occurs in the installation process is gradually checked;
recording the checking result of the step 7;
step 8, detecting the sample
The samples include sample 1 and sample 2;
the sample 1, namely the insulating material scraps and the metal particles obtained by sampling in the step 4 and the step 7, is subjected to detection of the components of the insulating material scraps and the metal particles by an energy spectrum analyzer;
sample 2, i.e., the deposited powder sampled in step 7, was subjected to elemental composition measurement.
Preferably, the specific process of the loop resistance test in step 5 includes: the method comprises the steps of firstly obtaining a loop resistance factory value in factory information of the circuit breaker to be disassembled, then testing the loop resistance of the circuit breaker to be disassembled, and checking whether a test result meets technical requirements or not after testing.
Preferably, the specific manner of the stroke measurement in step 6 is as follows: the original stroke L of the circuit breaker to be disassembled when leaving the factory is obtained firstly, and then the stroke L' of the circuit breaker to be disassembled is directly measured by adopting a mechanical dimension method, and the recorded data is standby for subsequent judgment of whether the circuit breaker to be disassembled exceeds the stroke.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides an SF 6 A method for disassembling and checking column type circuit breaker includes such steps as connecting lever box, ceramic sleeve tube, insulating pull rod, moving contact and static contact 6 The key checking position and key points of each part are also defined by the components of the column type open circuit. The method can enable technicians to get on the hand quickly and improve the disassembling efficiency; meanwhile, in combination with the disassembly process, the equipment operation and maintenance personnel who are not familiar with the internal structure of the equipment can quickly know the SF 6 The internal structure of the column type circuit breaker is beneficial to the development of the work such as simulation calculation and the like.
2. Ultrasonic live-line detection is mostly applied to tank-type circuit breakers, SF in production practice 6 The column type circuit breaker rarely uses ultrasonic live detection as a means for detecting discharge or abnormal sound defects on line. In the embodiment of the invention, the SF with abnormal sound defect is targeted 6 The column type breaker applies the sensor of the ultrasonic electrified detection tester to SF 6 After the column type circuit breaker crank arm box is positioned, abnormal sound signals are detected, and metal particles are found on the inner side of the crank arm box in the disassembling process; namely: define SF 6 Feasibility of the column circuit breaker acoustic signal live detection method.
Therefore, the method can be popularized to the field, and the ultrasonic detector is utilized to perform preliminary inspection on the abnormal sound defect of the column type circuit breaker on the premise of ensuring that the detection safety distance is enough (such as a special insulating rod configured by using an instrument), so that the method is more beneficial to defect investigation and diagnosis.
3. In each step of disassembling, the invention provides the main point position and possible defect form of defect investigation and provides the important focus such as SF 6 The problems of cleanliness of the upper section porcelain sleeve and the lower section porcelain sleeve of the column type circuit breaker, displacement of a circuit breaker connecting piece caused by improper installation and transportation and the like are solved, the error that the defect cause cannot be effectively presumed due to the fact that necessary investigation content is omitted in the disassembling process is avoided, and the defect position can be searched and the defect cause can be presumed by power technicians more conveniently.
4. The invention provides an SF 6 The disassembling and checking method of the column type breaker and the process of SF 6 Disassembling method of column type circuit breaker and its abnormal troubleshooting technical key point, able to more efficiently service SF 6 The abnormity diagnosis of the column type circuit breaker solves the practical difficulty of production and accumulates technical experience.
Drawings
FIG. 1 is a flow chart of the disassembling and checking method of the present invention.
FIG. 2 shows SF 6 The column type circuit breaker is schematically shown.
Fig. 3 is a schematic front view of a stationary contact part.
Fig. 4 is a schematic bottom view of the stationary contact.
Fig. 5 is a schematic front view of the moving contact part.
FIG. 6 is a schematic front view of the moving contact part, the nozzle and the arcing contact.
In the figure: 1. an upper section; 2. a lower section; 3. an intermediate connecting portion; 4. a crank arm box; 5. an upper section of porcelain bushing; 6. a lower section of porcelain sleeve; 7. an insulating pull rod; 8. a piston connecting rod; 9. an upper locking pin; 10. an arc extinguishing chamber; 11. an adsorbent; 12. a lower locking pin; 13. a stationary contact portion; 14. a movable contact part; 15. section of the static contact part; 16. an outer cylinder; 17. a main static contact; 18. an inner barrel; 19. an arc stationary contact; 20. a pneumatic cylinder; 21. an active contact; 22. a spout; 23. an arc moving contact; 24. powder; 25. position A; 26. a position B; 27. a shield case; 28. a polytetrafluoroethylene nozzle.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
The invention provides an SF 6 Disassembling and checking method of column type circuit breaker, and SF 6 Column type circuit breaker refers to SF with abnormal sound defect in operation 6 A body portion of the column circuit breaker, free of an operating mechanism; SF having abnormal sound defect in the body 6 The column type circuit breaker is marked as a circuit breaker to be disassembled, and the disassembling and abnormal troubleshooting method is used for performing abnormal troubleshooting on the circuit breaker to be disassembled, namely in the disassembling process of the circuit breaker to be disassembled.
Fig. 1 is a flow chart of the disassembling and inspecting method of the present invention, and as can be seen from fig. 1, the disassembling and inspecting method includes the following steps:
step 1, acquiring structural information and factory information of a circuit breaker to be disassembled;
in this embodiment, the factory information at least includes SF to be disassembled 6 Rated voltage of the column type circuit breaker, a delivery value of the loop resistance and an original stroke L when the column type circuit breaker is delivered from a factory.
In this embodiment, the SF of the abnormal sound 6 The voltage class of the pole type circuit breaker is 220kV, audible 'buzzing' abnormal sound is generated near the crank arm box 4 of the pole type circuit breaker, the sound of the abnormal sound is higher than the background noise of the operation of the transformer substation, and the abnormal sound is similar to metal vibration sound. For this reason, the operator will use his SF 6 The column break body sections are transported to a high voltage test hall for analysis.
Step 2, develop the electrified detection of acoustic signal before disassembling the circuit breaker, include:
standing the gas-filled SF 6 The column circuit breaker is fixed on a test bracket, keeps the ground insulation distance not less than 2.5m, and carries out an alternating current withstand voltage test with the external test voltage of SF 6 80% of the leaving alternating current test voltage of the column type circuit breaker, and recording the alternating current withstand voltage test result;
after the alternating-current withstand voltage test is finished and the discharge is carried out, a sensor of the ultrasonic electrified detection tester is attached to the crank arm box 4; step-Up external applicationTest voltage to SF 6 After the column circuit breaker operates the phase voltage, keeping the pressure application time to be not less than 10min, and recording an acoustic signal in the pressure application process by using an ultrasonic electrified detection tester;
in this example, the SF after the inflation standing is first verified 6 The pressure of the column type circuit breaker is rated pressure, and no SF is confirmed 6 After gas leakage, use of SF 6 SF of comprehensive tester for standing inflated gas 6 Column type circuit breaker develops SF 6 Testing the purity and decomposition products of the gas; then SF is added 6 The column-type circuit breaker is vertically fixed on a test bracket and is SF in operation according to the regulation 6 The alternating current test voltage of the column type circuit breaker is 80% of the factory alternating current test voltage, namely 368kV, and the test time is 1min.
In this example, after the 1min ac withstand voltage test was passed, SF was performed under the condition that the applied voltage value was the operating voltage 6 And detecting the sound signal of the column type circuit breaker in an electrified way. During detection, the ultrasonic sensor is adhered to the crank arm box 4, the external applied voltage is increased to 127kV of the operating phase voltage, and the applied voltage time is kept to be not less than 10min. In this embodiment, the acoustic signal detection result shows: the circuit breaker has abnormal sound, and the discharge frequency is about 2 times/min.
In this embodiment, the ultrasonic live detection tester has varying quality, and the sensors disposed therein have different sensitivities. For the circuit breaker to be disassembled with the abnormal sound audible by human ears in operation, the number of the sensors is increased or the sensors with high sensitivity are selected to determine whether the abnormal sound comes from the circuit breaker to be disassembled.
Step 3, separating the upper section 1 and the lower section 2 of the breaker to be disassembled
Unscrewing a connecting bolt of the middle connecting part 3 of the circuit breaker to be disassembled, separating an upper section of the porcelain sleeve 5 from a lower section of the porcelain sleeve 6, and viewing a piston connecting rod 8;
checking whether the upper locking pin 9 arranged at the piston connecting rod 8 is loosened or not and whether discharge traces exist or not, and recording;
and (4) dismantling the upper side locking pin 9 and the piston connecting rod 8 to complete the separation of the upper section 1 and the lower section 2 of the circuit breaker to be disassembled.
In this embodiment, the connecting bolt of the intermediate connecting part 3 of the upper section 1 and the lower section 2 is checked to determine whether displacement occurs between the upper section 1 and the lower section 2; in actual production, some manufacturers can perform corresponding position calibration after the connecting bolts of the middle connecting part 3 are screwed in place, and the calibration is more beneficial to determining whether the upper section 1 and the lower section 2 are displaced.
Step 4, disassembling and checking the lower section 2
Unscrewing connecting bolts of the crank arm box 4 and the lower section of the porcelain sleeve 6, and extracting the crank arm box 4 and the insulating pull rod 7 connected with the crank arm box from the lower section of the porcelain sleeve 6 integrally;
whether the surface of the insulating pull rod 7 is smooth or dirty or not is checked, whether the crank arm joint and the lower side locking pin 12 in the crank arm box 4 are loosened or not and whether discharge traces exist or not is checked and recorded;
the inner wall cleanliness factor of lower section porcelain bushing 6 and the inner wall cleanliness factor of turning arm case 4 are investigated, and is concrete, use the mode of chipless paper handkerchief wiping to check whether the inner wall adheres to insulating material piece and metal particle, if have, the sample is saved.
In this embodiment, a small amount of white granular and linear impurities are attached to the inner wall of the lower section of porcelain sleeve 6, a suspected insulating material is remained, a plurality of metal chips are found in the crank arm box 4, and the lower section of porcelain sleeve is sampled, sealed and retained as required in the disassembling process.
Step 5, testing loop resistance
And adjusting the arc extinguish chamber 10 to a switching-on position, measuring the loop resistance of the circuit breaker to be disassembled, and recording the test result of the loop resistance.
Specifically, a factory value of loop resistance in factory information of the circuit breaker to be disassembled is obtained firstly, then loop resistance testing is carried out on the circuit breaker to be disassembled, and whether a testing result meets technical requirements or not is checked after testing. In this embodiment, referring to the status maintenance rule, it can be determined whether the loop resistance test result meets the requirement of the technical range.
Step 6, measuring the stroke
And measuring the stroke of the circuit breaker to be disassembled, judging whether the circuit breaker exceeds the stroke or not, and recording a test result.
Specifically, the original stroke L of the circuit breaker to be disassembled when the circuit breaker leaves the factory in the factory information is firstly obtained, then the stroke L' of the circuit breaker to be disassembled is directly measured by adopting a mechanical dimension method, and the recorded data is reserved and used for subsequently judging whether the circuit breaker to be disassembled exceeds the stroke.
Step 7, disassembling and checking arc extinguishing chamber 10
The arc extinguishing chamber 10 is installed at the SF 6 The inner cavity of the upper section 1 of the column breaker is composed of a static contact part 13 and a moving contact part 14;
step 7.1, separating the stationary contact part 13 from the moving contact part 14
Firstly, vertically placing an upper section 1, opening a flange bolt at the upper part of the upper section 1, then using a top crane to lift out a static contact part 13, then horizontally placing the upper section 1, and pulling out a movable contact part 14 along the horizontal direction;
after the static contact part 13 and the movable contact part 14 are separated in sequence, the cleanness of the inner wall of the upper section porcelain sleeve 5 is checked, whether insulating material scraps and metal particles are attached to the inner wall of the upper section porcelain sleeve 5 is checked in a mode of wiping the inner wall by using a chipless paper towel, and if yes, sampling and retaining are carried out;
step 7.2, the static contact parts 13 are checked
The adsorbent 11 at the top end of the static contact part 13 is removed, the internal structure of the static contact part 13 can be obtained through peeping, the static contact part 13 is of a double-layer cylindrical concentric structure, the main static contact 17 is installed on the inner surface of the outer cylinder 16, and the arc static contact 19 is installed at the geometric center of the inner cylinder 18;
checking whether the components in the static contact part 13 have dislocation and abrasion phenomena, checking whether the arc static contact 19 is ablated or not, and checking whether the surface has attached powder or not, if so, sampling, sealing and retaining;
step 7.3, disassemble and investigate the moving contact part 14
Firstly, inspecting the shielding cover 27 on the upper side of the nozzle 22 of the movable contact part 14, specifically, inspecting whether the powder is adhered to the inner surface of the shielding cover 27, inspecting whether the powder is adhered to the outer surface and the inner hole surface of the polytetrafluoroethylene nozzle 28 positioned at the upper end of the arc movable contact 23 in the shielding cover 27, inspecting whether the ablation trace is formed on the inner surface and the outer surface of the polytetrafluoroethylene nozzle 28, and sampling, sealing and retaining the powder adhered to the surface of the part;
secondly, recording the contact surface of the air cylinder 20 and the active contact 21 as a position A25 and the top end surface of the air cylinder 20 as a position B26, and further disassembling and examining the movable contact part 14;
the moving contact part 14 is disassembled into an upper part and a lower part from the position A25, the upper end of the inner part of the lower part is provided with a driving contact 21 in a surrounding way, and whether the driving contact 21 deviates or not is checked; secondly, disassembling the upper part of the movable contact part 14 after disassembly and separation at a position B26, specifically, integrally pulling the arc movable contact 23 and the nozzle 22 out of the air cylinder 20, and then unscrewing the fixing screw to pull the arc movable contact 23 out of the nozzle 22, so that the component disassembly of the movable contact part 14 is completed; in the disassembly process, whether dislocation or offset occurs in the installation process is gradually checked;
and recording the checking result of the step 7.
In this embodiment, the investigation finds that the main fixed contact 17 of the fixed contact part 13 has no dislocation or abrasion; the static arc contact 19 is slightly worn, normal wear caused by disconnection is judged, decomposition products in the arcing process of the arc static contact 19 are attached to the surface of the static arc contact, the static arc contact is gray and granular after meeting air, and the static arc contact is sampled, sealed and retained according to requirements in the disassembly process.
In this embodiment, the grey granular powder is attached to the upper surface of polytetrafluoroethylene nozzle 28, also piles up a certain amount of grey powder in shield 27, and the sealed storage of taking a sample as required in the process of disassembling.
In the embodiment, the SF is combined with the moving contact part-the spout and the arc moving contact front view schematic diagram shown in figure 6 6 After the bolts of all parts of the column type circuit breaker are screwed in place, the installer marks the corresponding positions, namely the calibration line penetrating through the bolts and the nuts, and the disassembly positions are not displaced by verification.
Step 8, detecting the sample
The samples include sample 1 and sample 2;
the method comprises the steps of 1, namely, sampling the insulating material scraps and the metal particles obtained in the steps 4 and 7, and detecting the components of the insulating material scraps and the metal particles in the sample by using an energy spectrum analyzer;
sample 2 was the adhered powder sampled in step 7, and the elemental composition of this sample was measured.
In this embodiment, the metal debris inside the crank case 4 is copper debris detected by the energy spectrum analyzer, and the metal particles should be a cause of audible "buzzing" and abnormal sound caused by the ears near the crank case 4 of the circuit breaker through study and judgment. The powder of the arc extinguish chamber 10 is mainly composed of fluorine and iron elements which account for about 80 percent of the total weight of the powder by element component measurement, and the powder meets the requirement of SF 6 The main components of the metal electrode of the circuit breaker and the gas insulation medium material; in combination with the ablation of the arc stationary contact 17 and the arc movable contact 23, the possibility of high-energy discharge in the arc extinguishing chamber is eliminated.
In the embodiment, the recorded alternating-current voltage withstand test result and the test and detection data such as the sound signal and the loop resistance test result in the pressure applying process are recorded by the ultrasonic live-line detection tester, and compared with the SF in normal operation, the SF in the embodiment is empirically judged 6 Circuit breaker, the table SF 6 The amount of the gray powder accumulated in the breaker shield 27 is large, which is an abnormal phenomenon, and it is presumed that the arc extinguishing chamber member is displaced by an accidental collision during transportation.
FIGS. 2-6 show a 220kV SF 6 The main body structure of the column circuit breaker, as can be seen from fig. 2-6, SF in the invention 6 The structure and components of the column breaker are as follows:
220kV SF 6 the column type circuit breaker is vertically arranged on a cement pillar and consists of an upper section 1 and a lower section 2, and an upper section porcelain sleeve 5 and a lower section porcelain sleeve 6 are connected into a whole through a middle connecting part 3.
The lower end of a section porcelain sleeve 6 of the lower section 2 is connected with a crank arm box 4, the main internal part of the lower section 2 is an insulating pull rod 7, the upper end of the insulating pull rod 7 is connected with an arc extinguish chamber 10 through a piston connecting rod 8 and an upper side locking pin 9, and the lower end of the insulating pull rod 7 is connected with the crank arm box 4 through a lower side locking pin 12. The internally mounted part of the upper section 1 is the entire SF 6 The core component of the column type circuit breaker comprises an arc extinguishing chamber 10 composed of a fixed contact part 13 (figures 3 and 4) and a movable contact part 14 (figures 5 and 6), and an adsorbent arranged at the top end of the fixed contact part 1311。
Referring to the cross-sectional view of the cross-sectional portion 15 of the fixed contact in fig. 3, it can be seen that the fixed contact 13 is a double-layered concentric cylinder structure, the inner surface of the outer cylinder 16 is provided with the main fixed contact 17, and referring to fig. 4, the fixed contact 17 is rectangular sheet-shaped and is welded to the inner surface of the outer cylinder 16 piece by piece, the geometric center of the inner cylinder 18 is provided with the arc fixed contact 19, and the arc fixed contact 19 is cylindrical and has a hemispherical top end.
With reference to fig. 5 and 6, the main components of the moving contact part 14 include a puffer cylinder 20, a driving contact 21, an arc contact 23, a spout 22, a shield 27, a teflon nozzle 28, etc., and the driving contact 21 is a spring contact finger in fig. 5 and 6. SF 6 When the column circuit breaker opens the current, the arc extinguish chamber 10 is in working state, the air cylinder 20 of the moving contact part 14 compresses SF 6 Gas, compressed SF 6 Gas is ejected from the nozzle 22 for extinguishing the arc. In view of the structure of the moving contact part 14, the position a25 and the position B26 need to be disassembled twice during disassembly, so as to facilitate the inspection of such key components after disassembling the driving contact 21, the spout 22, the shield 27, the teflon nozzle 28, and the like.

Claims (3)

1. SF (sulfur hexafluoride) 6 Disassembling and checking method of column type circuit breaker, and SF 6 Column type circuit breaker refers to SF with abnormal sound defect in operation 6 The body part of the column type circuit breaker is called as the circuit breaker to be disassembled, and is characterized in that the disassembling and checking method comprises the following steps:
step 1, acquiring structural information and factory information of a circuit breaker to be disassembled;
step 2, develop the electrified detection of acoustic signal before the circuit breaker of waiting to disassemble, include:
standing the aerated SF 6 The column circuit breaker is fixed on a test bracket, keeps the ground insulation distance not less than 2.5m, and carries out an alternating current withstand voltage test with the external test voltage of SF 6 80% of the outgoing AC test voltage of the column type circuit breaker, and recording the AC withstand voltage test result;
after the AC withstand voltage test is finished and the discharge is carried out, the ultrasonic wave is electrifiedA sensor of the detection tester is pasted on the crank arm box (4); step-wise increase of applied test voltage to SF 6 After the column circuit breaker operates the phase voltage, keeping the pressure application time to be not less than 10min, and recording an acoustic signal in the pressure application process by using an ultrasonic electrified detection tester;
step 3, separating the upper section (1) and the lower section (2) of the breaker to be disassembled
Unscrewing a connecting bolt of a middle connecting part (3) of the circuit breaker to be disassembled, separating an upper section of the porcelain sleeve (5) from a lower section of the porcelain sleeve (6), and viewing a piston connecting rod (8);
checking whether the upper locking pin (9) arranged at the piston connecting rod (8) is loosened or not and whether discharge traces exist or not and recording;
dismantling the upper side locking pin (9) and the piston connecting rod (8) to complete the separation of the upper section (1) and the lower section (2) of the circuit breaker to be dismantled;
step 4, disassembling and examining the lower section (2)
Unscrewing connecting bolts of the crank arm box (4) and the lower section of the porcelain sleeve (6), and integrally extracting the crank arm box (4) and an insulating pull rod (7) connected with the crank arm box from the lower section of the porcelain sleeve (6);
whether the surface of the insulating pull rod (7) is smooth or dirty or not is checked, whether the crank arm joint and the lower side locking pin (12) in the crank arm box (4) are loosened or not and whether discharge traces exist or not is checked and recorded;
checking the cleanliness of the inner wall of the lower section of the porcelain bushing (6) and the cleanliness of the inner wall of the crank arm box (4), specifically, checking whether insulating material chips and metal particles are attached to the inner wall in a chipless paper towel wiping mode, and if so, sampling and retaining;
step 5, testing loop resistance
Adjusting an arc extinguish chamber (10) to a switching-on position, measuring the loop resistance of the circuit breaker to be disassembled, and recording the test result of the loop resistance;
step 6, measuring the travel
Measuring the stroke of the circuit breaker to be disassembled, judging whether the circuit breaker exceeds the stroke or not, and recording a test result;
step 7, disassembling and inspecting arc-extinguishing chamber (10)
The arc extinguish chamber (10) is arranged at SF 6 In the inner cavity of the upper section (1) of the column type circuit breaker, the inner cavity is composed ofA static contact part (13) and a moving contact part (14);
step 7.1, separating the static contact part (13) and the moving contact part (14)
Firstly, vertically placing an upper section (1), opening a flange bolt at the upper part of the upper section (1), then using a top crane to lift out a static contact part (13), horizontally placing the upper section (1), and pulling out a movable contact part (14) along the horizontal direction;
after the static contact part (13) and the moving contact part (14) are separated in sequence, the cleanness of the inner wall of the upper section porcelain sleeve (5) is checked, whether insulating material chips and metal particles are attached to the inner wall of the upper section porcelain sleeve (5) or not is checked in a mode of wiping the inner wall by using a chipless paper towel, and if yes, sampling and retaining are carried out;
step 7.2, the static contact part (13) is checked
The adsorbent (11) at the top end of the static contact part (13) is removed, the internal structure of the static contact part (13) can be obtained through peeping, the static contact part (13) is of a double-layer cylindrical concentric structure, a main static contact (17) is installed on the inner surface of the outer cylinder (16), and an arc static contact (19) is installed at the geometric center of the inner cylinder (18);
checking whether each part in the static contact part (13) has dislocation and abrasion, checking whether the arc static contact (19) is ablated or not and whether powder is attached to the surface or not, and sampling, sealing and retaining if the surface of the arc static contact (19) is attached with the powder;
step 7.3, disassemble and investigate the moving contact part (14)
Firstly, checking a shielding case (27) on the upper side of a nozzle (22) of a movable contact part (14), specifically, checking whether powder is adhered to the inner surface of the shielding case (27), checking whether powder is adhered to the outer surface and the inner hole surface of a polytetrafluoroethylene nozzle (28) at the upper end of an arc movable contact (23) in the shielding case (27), checking whether ablation traces exist on the inner surface and the outer surface of the polytetrafluoroethylene nozzle (28), wherein the powder is adhered to the surface of the part, sampling, sealing and retaining;
secondly, recording the contact surface of the air cylinder (20) and the active contact (21) as a position A (25) and the top end surface of the air cylinder (20) as a position B (26), and further disassembling and checking the moving contact part (14);
disassembling the moving contact part (14) into an upper part and a lower part from a position A (25), wherein the upper end of the inner part of the lower part is provided with a driving contact (21) in a surrounding way, and whether the driving contact (21) deviates or not is checked; secondly, disassembling the upper part of the disassembled and separated movable contact part (14) at a position B (26), specifically, integrally pulling out the arc movable contact (23) and the nozzle (22) from the air cylinder (20), and unscrewing a fixing screw to pull out the arc movable contact (23) from the nozzle (22), so that the parts of the movable contact part (14) are completely disassembled; in the disassembly process, whether dislocation or deviation occurs in the installation process is gradually checked;
recording the checking result of the step 7;
step 8, detecting the sample
The samples include sample 1 and sample 2;
the sample 1, namely the insulating material scraps and the metal particles obtained by sampling in the step 4 and the step 7, is subjected to detection of the components of the insulating material scraps and the metal particles by an energy spectrum analyzer;
sample 2 was the adhered powder sampled in step 7, and the elemental composition of this sample was measured.
2. SF according to claim 1 6 The column type circuit breaker disassembling and checking method is characterized in that the specific process of the loop resistance test in the step 5 comprises the following steps: the method comprises the steps of firstly obtaining a loop resistance factory value in factory information of the circuit breaker to be disassembled, then testing the loop resistance of the circuit breaker to be disassembled, and checking whether a test result meets technical requirements or not after testing.
3. SF according to claim 1 6 The column type circuit breaker disassembling and checking method is characterized in that the stroke measurement in the step 6 is carried out in a specific mode as follows: the method comprises the steps of firstly obtaining original stroke L of the circuit breaker to be disassembled when the circuit breaker leaves the factory from factory information, then directly measuring the stroke L' of the circuit breaker to be disassembled by adopting a mechanical dimension method, and recording data for later use to judge whether the circuit breaker to be disassembled exceeds the stroke.
CN202211401973.7A 2022-11-10 2022-11-10 SF (sulfur hexafluoride) 6 Disassembling and checking method for column type circuit breaker Pending CN115542145A (en)

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