Determination method for components of SF6 gas equipment fault melts

A technology for equipment failure and component determination, which is applied in the direction of measuring devices, material separation, and material analysis, can solve problems such as neglect of faulty melts, low content of faulty melts, and difficulties in quantitative analysis of components of SF6 gas equipment faulty melts, etc. Achieving an effect that is helpful for daily maintenance

Active Publication Date: 2014-03-26
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
2 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Such a fault analysis process ignores the fault information contained in the fault melt of SF6 gas equipment, which may lead to misjudgment of the cause of the fault
However, since the gas discharge in the GIS gas chamber is a very complicated physical process, the composition of the melted product of SF6 gas equipment failure is also relatively complex, especially the content of the melted product of some SF6 gas equipment failure is very low, and it is difficult to determine SF6 with a single analysis method. The conte...
View more

Abstract

The invention discloses a determination method for components of SF6 gas equipment fault melts. The determination method comprises the specific steps: A, pre-treating a sample; B, qualitatively and semi-quantitatively analyzing, namely determining sample varieties and corresponding contents in the sample by using an EDS (Energy Dispersive Spectroscopy) and determining chemical group varieties in the sample by using an X-ray diffraction spectroscopy; and C, quantitatively analyzing, namely carrying out an ICP (Inductively Coupled Plasma) test to determine the content of cations in the sample and carrying out an IC (Integrated Circuit) test to determine the content of anions in the sample. According to the determination method for the components of the SF6 gas equipment fault melts, the SF6 gas equipment fault melts can be qualitatively and quantitatively analyzed by organically combining an EDS test, an XRD (X-Ray Diffraction) test, the ICP test and the IC test; the components of the SF6 gas equipment fault melts can be accurately determined so as to be good for analyzing an electrical equipment fault and guiding the operation and the daily maintenance of equipment.

Application Domain

Component separationMaterial analysis by electric/magnetic means +2

Technology Topic

SpectroscopyProduct gas +10

Image

  • Determination method for components of SF6 gas equipment fault melts
  • Determination method for components of SF6 gas equipment fault melts
  • Determination method for components of SF6 gas equipment fault melts

Examples

  • Experimental program(3)

Example Embodiment

[0037] Example 1
[0038] In this example, the SF6 gas equipment fault melt is taken from the gas chamber of a substation GIS bay switch
[0039] A method for determining the composition of SF6 gas equipment failure melt, the specific steps are as follows (please refer to figure 1 ):
[0040] A. Sample pretreatment:
[0041] Take a sample of SF6 gas equipment failure melt and dry it in an oven to obtain sample 1;
[0042] B. Qualitative and semi-quantitative analysis:
[0043] B1. Use EDS spectrometer to perform elemental analysis test on sample 1 to determine the element type and relative content in sample 1. The process parameters of the elemental analysis test are: electron beam diameter: 5-10cm; tungsten electron gun thermal electron current intensity : 20keV; 1~30kV high pressure acceleration; cold finger position ≥40mm; distance ≥16mm; emission angle ≥35°, the results are as follows:
[0044]
[0045] B2. Use an X-ray diffraction spectrometer to test sample 1 to determine the type of compound in sample 1. The process parameters and steps tested by the X-ray diffraction spectrometer are: using a Cu target and a Co target, grind sample 1 into powder (over 800 mesh sieve), evenly smear on the round sample stage, set the scanning angle range of 10°~90°, and the scanning step length of 0.0001°. The results are as follows:
[0046] Fe 3 O 2
[0047] C. Quantitative analysis:
[0048] C1. Take sample 1, accurately weigh it with a precision balance, dissolve it with 69wt% nitric acid, disperse ultrasonically, leave it to stand for 22 hours, and filter with a 0.35μm filter membrane in a 100ml constant-volume bottle to obtain sample 2; The process condition of the ultrasonic dispersion is to disperse for 18 minutes with an ultrasonic disperser at 70°C;
[0049] C2. Determine the types of cations that may appear in sample 2 according to the test results of step B1, and perform ICP test on sample 2 to determine the cation content in sample 2; the ICP test process parameters are: RF power 1000W, carrier gas 1L /min, cooling gas 14L/min, plasma gas 1L/min, purification gas 3.3L/min, observation height 13mm, integration time 4s (take the average of 3 measurements), the results are as follows:
[0050]
[0051] C3. Determine the types of anions that may appear in sample 2 according to the test results of step B1 and step B2, conduct an IC test on sample 2 to determine the anion content in sample 2; the process parameters of the IC test are: chromatographic column: AS9-HC type anion analysis column (250mm×4mm), AS9-HC type guard column (50mm×4mm); mobile phase: 1.6mmol/L sodium bicarbonate + 1.7mmol/L sodium carbonate eluent; 45mmol/L sulfuric acid Suppressor regeneration solution; injection volume: 23μL; flow rate: 1.4mL/min, the results are as follows:
[0052]
[0053] It can be seen from the above analysis results that the main components of the SF6 gas equipment failure melt in Example 1 are carbon black, Fe 2 O 3 , And contains a small amount of Cu and Al elements. Because the SF6 gas equipment fault melt contains a small amount of Cu element, it can be determined that the discharge position is near the contact and caused a certain ablation of the contact; if it contains a small amount of Al element, it can be determined that the discharge distance is large, from the contact position. Extends to the shell (the shell material is Al); there is also the main component of carbon black, indicating that the discharge has also ablated the insulating rod of the switch (mainly epoxy material); there is more Fe element, and it is found that there is burning at the operating mechanism Eclipse traces. In summary, this discharge is in the contact attachment, extending to the insulating rod, housing, and operating mechanism, and it is very likely to be a penetrating discharge caused by internal structural defects.

Example Embodiment

[0054] Example 2
[0055] In this embodiment, the SF6 gas equipment fault melt is taken from the gas chamber of a GIS bay switch in a certain substation.
[0056] A method for determining the composition of SF6 gas equipment failure melt, the specific steps are as follows:
[0057] A. Sample pretreatment:
[0058] Take a sample of SF6 gas equipment failure melt and dry it in an oven to obtain sample 1;
[0059] B. Qualitative and semi-quantitative analysis:
[0060] B1. Use EDS spectrometer to perform elemental analysis test on sample 1 to determine the element type and relative content in sample 1. The process parameters of the elemental analysis test are: electron beam diameter: 5-10cm; tungsten electron gun thermal electron current intensity : 20keV; 1~30kV high pressure acceleration; cold finger position ≥40mm; distance ≥16mm; emission angle ≥35°, the results are as follows:
[0061]
[0062] B2. Use an X-ray diffraction spectrometer to test sample 1 to determine the type of compound in sample 1. The process parameters and steps tested by the X-ray diffraction spectrometer are: using a Cu target and a Co target, grind sample 1 into powder (over 800 mesh sieve), evenly smear on the round sample stage, set the scanning angle range of 10°~90°, and the scanning step length of 0.0001°. The results are as follows:
[0063] C
[0064] C. Quantitative analysis:
[0065] C1. Take sample 1, accurately weigh it with a precision balance, dissolve it with 69wt% nitric acid, disperse ultrasonically, and let it stand for 26 hours, and then filter with a 0.55μm filter membrane in a 100ml constant volume bottle to obtain sample 2; The process conditions of the ultrasonic dispersion are at 90° C. for 12 minutes with an ultrasonic disperser;
[0066] C2. Determine the types of cations that may appear in sample 2 according to the test results of step B1, and perform ICP test on sample 2 to determine the cation content in sample 2; the ICP test process parameters are: radio frequency power 1200W, carrier gas 1.4 L/min, cooling gas 18L/min, plasma gas 1.2L/min, purification gas 3.7L/min, observation height 17mm, integration time 8s (take the average of 3 measurements), the results are as follows:
[0067]
[0068] C3. Determine the types of anions that may appear in sample 2 according to the test results of step B1 and step B2, conduct an IC test on sample 2 to determine the anion content in sample 2; the process parameters of the IC test are: chromatographic column: AS9-HC type anion analysis column (250mm×4mm), AS9-HC type guard column (50mm×4mm); mobile phase: 1.8mmol/L sodium bicarbonate + 1.9mmol/L sodium carbonate eluent; 55mmol/L sulfuric acid Suppressor regeneration solution; injection volume: 27μL; flow rate: 1.6mL/min, the results are as follows:
[0069]
[0070] It can be seen from the above analysis results that the main components of the SF6 gas equipment failure melt in Example 2 are carbon black, Fe 2 O 3 , And contains a small amount of Ni element, Cr element, Mn element and Al element. Because the main component is carbon black, it shows that the discharge has also ablated the insulating rod of the switch (mainly epoxy material); there are more Fe elements, no ablation marks at the operating mechanism, and a small amount of Ni, Cr Element, Mn element (in steel), it means that Fe element comes from the outside and is steel. In summary, this discharge is caused by external foreign matter (steel).

Example Embodiment

[0071] Example 3
[0072] In this example, the SF6 gas equipment fault melt is taken from the gas chamber of a substation GIS bay switch
[0073] A method for determining the composition of SF6 gas equipment failure melt, the specific steps are as follows (please refer to figure 2 ):
[0074] A. Sample pretreatment:
[0075] Take a sample of SF6 gas equipment failure melt and dry it in an oven to obtain sample 1;
[0076] B. Qualitative and semi-quantitative analysis:
[0077] B1. Use EDS spectrometer to perform elemental analysis test on sample 1 to determine the element type and relative content in sample 1. The process parameters of the elemental analysis test are: electron beam diameter: 5-10cm; tungsten electron gun thermal electron current intensity : 20keV; 1~30kV high pressure acceleration; cold finger position ≥40mm; distance ≥16mm; emission angle ≥35°, the results are as follows:
[0078]
[0079] B2. Use an X-ray diffraction spectrometer to test sample 1 to determine the type of compound in sample 1. The process parameters and steps tested by the X-ray diffraction spectrometer are: using a Cu target and a Co target, grind sample 1 into powder (over 800 mesh sieve), evenly smear on the round sample stage, set the scanning angle range of 10°~90°, and the scanning step length of 0.0001°. The results are as follows:
[0080] C
[0081] C. Quantitative analysis:
[0082] C1. Take sample 1, accurately weigh it with a precision balance, dissolve it with 69wt% nitric acid, disperse ultrasonically, leave it to stand for 24 hours, and filter with a 0.45μm filter membrane in a 100ml constant-volume bottle to obtain sample 2; The process condition of the ultrasonic dispersion is to use an ultrasonic disperser for 15 minutes at 80°C;
[0083] C2. Determine the types of cations that may appear in sample 2 according to the test results of step B1, and conduct ICP test on sample 2 to determine the cation content in sample 2. The ICP test process parameters are: radio frequency power 1100W, carrier gas 1.2 L/min, cooling gas 16L/min, plasma gas 1.1L/min, purification gas 3.5L/min, observation height 15mm, integration time 6s (take the average of 3 measurements), the results are as follows:
[0084]
[0085]
[0086] C3. Determine the types of anions that may appear in sample 2 according to the test results of step B1 and step B2, conduct an IC test on sample 2 to determine the anion content in sample 2, and the process parameters of the IC test are: chromatographic column: AS9-HC type anion analysis column (250mm×4mm), AS9-H C type guard column (50mm×4mm); mobile phase: 1.7mmol/L sodium bicarbonate + 1.8mmol/L sodium carbonate eluent; 50mmol/L Sulfuric acid suppressor regenerant; injection volume: 25μL; flow rate: 1.5mL/min, the results are as follows:
[0087]
[0088] It can be seen from the above analysis results that the main components of the SF6 gas equipment failure melt of Example 3 are carbon black and AlF 3 , And contains a small amount of Ni element, Si element, Na element, Ag element and Al element. Because the main component is carbon black, it means that the discharge has also ablated the insulating rod of the switch (mainly epoxy material); a small amount of Ni and Ag elements indicate that the contact material is ablated, indicating that the discharge location is near the contact.
[0089] It can be seen from the above three embodiments that the determination of the fault location and cause of the fault by measuring the composition of the SF6 gas equipment fault melt is a powerful means for fault analysis. Through the analysis of a large number of failure laws, it is also beneficial to summarize the failure laws of SF6 gas equipment and avoid failures.

PUM

PropertyMeasurementUnit
Diameter5.0 ~ 10.0cm
Launch angle>= 35.0deg

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products