CN109459280B - Transformer gas on-site sampling device and method - Google Patents
Transformer gas on-site sampling device and method Download PDFInfo
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- CN109459280B CN109459280B CN201811063165.8A CN201811063165A CN109459280B CN 109459280 B CN109459280 B CN 109459280B CN 201811063165 A CN201811063165 A CN 201811063165A CN 109459280 B CN109459280 B CN 109459280B
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- 238000005070 sampling Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims description 52
- 238000001514 detection method Methods 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000010891 electric arc Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
Abstract
The invention discloses a transformer gas field sampling device and a transformer gas field sampling method, wherein the transformer gas field sampling device comprises an air exhaust device, a first connecting pipe and a communicating pipe, wherein the air exhaust device is provided with a first air exhaust head, and the communicating pipe comprises a first port, a second port and a third port which are communicated with each other; one end of the first connecting pipe is communicated with the first opening, the other end of the first connecting pipe is provided with a connecting joint used for being connected with the gas relay, the second opening is communicated with the first air exhaust head, and the third opening is provided with an elastic sealing plug. The invention provides a transformer gas field sampling device and a transformer gas field sampling method, which have good sealing performance and can effectively avoid gas leakage or pollution of sample gas caused by external air entering; simple structure, low manufacturing cost and the like.
Description
Technical Field
The invention relates to the technical field of power equipment test tools, in particular to a transformer gas field sampling device and method.
Background
In an electric power system, a large transformer is a core device of the whole power supply system, and the failure of the large transformer has serious influence on the reliability of power supply and the normal operation of the system. The gas protection is a protection device of an oil-immersed transformer, is a main protection component in the transformer, and can sensitively act on turn-to-turn and interlayer short circuits of the transformer, iron core faults, internal faults of a sleeve, internal disconnection of a winding, insulation degradation, oil level reduction and other faults. The gas relay is arranged on a connecting pipe between the transformer box cover and the oil storage tank, and when a fault occurs in the oil-immersed transformer, the electric arc decomposes the insulating material and generates a large amount of gas or causes oil flow impact, the contact of the gas relay is enabled to act. And an alarm signal is sent out in time or the transformer is automatically cut off, so that the safe operation of the equipment is protected.
Once the alarm of the gas relay occurs, a maintainer needs to acquire gas in the gas relay on the site of the transformer and judge whether a fault occurs inside the transformer and the type of the fault through analysis of gas components, so that the acquisition of the gas relay is particularly important. The gas relay of the transformer sends gas to the gas collecting box through a pipeline, and the traditional sampling method is that a needle cylinder and the gas collecting box are connected through a flexible leather hose, and the gas in the gas collecting box is pumped into the needle cylinder. This method has the following disadvantages: (1) the joints of the hose, the gas collecting box and the needle cylinder have no good sealing performance, and gas leakage or external air entering is easy to occur so as to pollute sample gas. (2) The gas of the gas relay can not be quantified, and the information of the total gas quantity is lacked for judging the fault of the transformer.
Chinese patent application publication No. CN204594751U, published as 2015, 08 and 25, entitled "transformer gas taking device", discloses a transformer gas taking device, which comprises a vacuumizing gas collecting bag, and is structurally characterized in that the upper end of one side of the vacuumizing gas collecting bag is provided with a vertical rubber sealing gas taking hole, the upper end of the other side of the vacuumizing gas collecting bag is provided with an F-shaped rubber hose, the horizontal pipe at the upper end of the F-shaped rubber hose is provided with an upper check valve, and the horizontal pipe at the middle part of the F-shaped rubber hose is provided with a lower check valve; an upper connecting nut is arranged at the outer end of the transverse pipe at the upper end of the F-shaped rubber hose, and a lower connecting nut is arranged at the outer end of the transverse pipe in the middle of the F-shaped rubber hose; and scale strips are vertically arranged on the lower middle part of the side of the F-shaped rubber hose on the vacuumizing air collecting bag. But the device can not actively suck air, and the air suction efficiency is low; the vacuum bag can not be reused, a new vacuum bag needs to be replaced every time air is taken, and the air tightness of the connection between the vacuum bag and the hose can not be ensured; and the device cannot accurately measure the total amount of the gas.
Disclosure of Invention
The invention provides a transformer gas field sampling device and a method for overcoming the defects in the prior art, which have good sealing performance and can effectively avoid gas leakage or pollution of sample gas caused by external air entering; simple structure, low manufacturing cost and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transformer gas on-site sampling device comprises an air extracting device, a first connecting pipe and a communicating pipe, wherein a first air extracting head is arranged on the air extracting device, and the communicating pipe comprises a first port, a second port and a third port which are communicated with each other; one end of the first connecting pipe is communicated with the first opening, the other end of the first connecting pipe is provided with a connecting joint used for being connected with the gas relay, the second opening is communicated with the first air exhaust head, and the third opening is provided with an elastic sealing plug. Through implementing above-mentioned technical scheme, can carry out on-the-spot sample to transformer gas. The connecting joint can adopt a quick joint in the prior art, so that the sealing performance can be ensured, and the quick connection of the device can be realized. The air extractor can generate negative pressure to suck air into the air extractor. The elastic sealing plug is tightly plugged in the third through hole and can be replaced, so that the insertion of the needle head of the sampling needle tube can be ensured, and the air tightness of the device can be ensured when the needle head of the sampling needle tube is pulled out. When the device is used for sampling gas, the connecting joint is connected with a sampling joint of a gas collecting box of a transformer, an air extractor is pulled, when liquid enters the air extractor, the gas in the gas collecting box is emptied, a switch on the sampling joint of the gas collecting box is closed, after the liquid in a first connecting pipe enters the air extractor, a needle head of a sampling needle tube is inserted into an elastic sealing plug, and a proper amount of gas to be detected is taken out; and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
Preferably, the air extracting device comprises an air extracting pipe and a piston rod, the first air extracting head is communicated with the air extracting pipe, a piston head is arranged at one end of the piston rod, the air extracting pipe is in sliding connection with the piston head, and the air extracting pipe is provided with scale marks. The exhaust tube is completely or partially transparent, the position of the piston head of the exhaust tube can be observed, and the internal gas volume can be read. The piston rod is pulled to generate negative pressure in the air exhaust pipe, the air exhaust function is realized, and the volume of the air in the air exhaust pipe can be read out through the scale marks.
Preferably, a second air exhaust head communicated with the air exhaust pipe is arranged on the air exhaust pipe, a three-way joint is arranged on the connecting joint, the first connecting pipe is communicated with the connecting joint through the three-way joint, the three-way joint comprises a first interface, a second interface and a third interface which are mutually communicated, the first interface is communicated with the first connecting pipe, the second interface is communicated with the connecting joint, the third interface is communicated with the second air exhaust head through the second connecting pipe, and a switch valve is arranged on the third interface. Through implementing above-mentioned technical scheme, can guarantee that the liquid in the first connecting tube gets into the exhaust tube completely, can confirm to measure buchholz relay's gaseous total amount accurately. The first connecting pipe diameter is less, and transformer oil viscosity is great, and when the switch on the gas collection box sampling joint was closed, the one end that first connecting pipe was equipped with coupling joint was airtight, because the atmospheric pressure difference principle, the liquid of connecting in the first connecting pipe hardly gets into in the gas-extraction pipe completely, leads to the gas volume to measure inaccurately. When the gas in the gas collection box is discharged and liquid appears in the connecting pipe, the switch on the sampling connector of the gas collection box is closed, then the switch valve is opened, the second connecting pipe is communicated with the first connecting pipe, a loop can be formed when the switch on the sampling connector of the gas collection box is closed, the height of the liquid and gas interface in the first connecting pipe is different from the height of the liquid and gas interface in the second connecting pipe at the moment, a height difference is formed, the pressure intensity of the two interfaces is different, the liquid can form backflow, and the liquid can completely flow into the exhaust pipe. After the liquid completely enters the exhaust tube, reading the volume V of the gas in the exhaust tube2Will V2With gas volume V in pre-calibrated device connection tubes and other gaps1Adding to obtain the measured gas volume VGeneral assembly. Then inserting the needle head of the sampling needle tube into the elastic sealing plug, and taking out a proper amount of gas to be detected; and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
Preferably, an air valve is arranged on the connecting joint. The gas valve can be closed after the gas in the gas collection box is exhausted, the connecting joint can be detached after the gas valve is closed, and the device is transferred to other places for other steps.
Preferably, the piston head is provided with a clamping groove, a sealing ring is arranged in the clamping groove, the inner side of the sealing ring is in contact with the piston head, and the outer side of the sealing ring is in contact with the inner wall of the exhaust tube. The structure can ensure the tightness of the sampling device.
Preferably, the first connection tube is a transparent tube. The condition of the first connecting pipe can be observed, the gas in the gas collecting box is completely extracted, and meanwhile, when the reading is ensured, the liquid in the first connecting pipe is completely emptied.
Preferably, the piston rod is provided with a hand-pulling piece, and the hand-pulling piece is arranged at one end opposite to the piston head. The structure can facilitate the movement of the piston rod during air suction.
Preferably, the elastic sealing plug material is rubber. The elastic sealing plug is made of rubber materials, so that the insertion of the needle head of the sampling needle tube can be ensured, and the air tightness of the device can be ensured when the needle head of the sampling needle tube is pulled out.
A transformer gas field sampling method adopts a transformer gas field sampling device, and comprises the following steps:
a. capacity measurement:
a1. putting the connecting joint into the measured liquid, opening the air valve and the switch valve, and pulling the piston rod to fill each part of the device with the measured liquid;
a2. the piston rod is pushed to the bottom, so that the exhaust pipe is ensured not to have the measured liquid, and the connecting pipe and other gaps of the device are ensured to be filled with the measured liquid;
a3. closing the gas valve and taking the connecting joint out of the measured liquid;
a4. opening the air valve, pulling the piston rod to make all the measured liquid enter the air exhaust pipe;
a5. reading out the liquid volume of the exhaust tube and recording as the gap gas volume V1；
b. Connecting: connecting the connecting joint with a sampling joint of a gas collecting box of a transformer, closing a switch valve, opening an air valve of the connecting joint, and opening a switch on the sampling joint of the gas collecting box;
c. air suction: pulling the piston rod to enable the gas to be detected to enter the exhaust pipe, stopping sucking when continuous liquid appears in the connecting pipe, and closing the air valve on the connecting joint;
d. standing: opening the switch valve, standing the device for a period of time, and allowing all liquid in the connecting pipe to enter the exhaust pipe;
e. reading: after no liquid exists in the connecting pipe, reading the gas volume V of the exhaust pipe2；
f. And (3) calculating: calculating the volume V of the gas to be measuredGeneral assembly，VGeneral assembly＝V1+V2；
g. Sampling: inserting the needle head of the sampling needle tube into the elastic sealing plug, and taking out a proper amount of gas to be detected;
h. and (3) detection: and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
Through implementing above-mentioned technical scheme, can guarantee the sealed effect of on-the-spot sample to transformer gas on-the-spot sample, the total amount of gas in the measurement gas collection box that simultaneously can be accurate.
Preferably, the method further comprises the following steps between the step c and the step d:
i. separation: and d, taking the connecting joint down from the gas collecting box, transferring the connecting joint to a proper position, and then performing step d.
Through implementing above-mentioned technical scheme, can close gas collection box switch after the gas in the gas collection box all gets into sampling device, take off the device and take to the environment that is more fit for doing the experiment and test, avoid being in near the relay for a long time, to reducing the hidden danger of personal safety.
The invention has the beneficial effects that: (1) the sealing performance is good, and gas leakage or pollution of sample gas caused by external air entering can be effectively avoided; (2) the total gas amount of the gas relay can be accurately measured; (3) simple structure, low manufacturing cost and the like; (4) the device can be taken down to be brought to an environment more suitable for testing, operation near the relay for a long time is avoided, and hidden dangers of personal safety are reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: air exhaust device 1, exhaust tube 1.1, piston rod 1.2, first head of bleeding 1.3, piston head 1.4, scale mark 1.5, second head of bleeding 1.6, first connecting pipe 2, communicating pipe 3, first opening 3.1, second opening 3.2, third opening 3.3, attach fitting 4, elastic sealing plug 5, three way connection 6, first interface 6.1, second interface 6.2, third interface 6.3, pneumatic valve 7, draw-in groove 8, sealing washer 9, second connecting pipe 10, hand power piece 11, ooff valve 12.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1:
as shown in fig. 1, the transformer gas on-site sampling device comprises an air extraction device 1, a first connecting pipe 2 and a communicating pipe 3, wherein the air extraction device 1 is provided with a first air extraction head 1.3, and the communicating pipe 3 comprises a first through opening 3.1, a second through opening 3.2 and a third through opening 3.3 which are communicated with each other; 2 one end of first connecting pipe and first opening 3.1 intercommunication, the 2 other ends of first connecting pipe are equipped with the attach fitting 4 that is used for being connected with the gas collection box, and second opening 3.2 and first gas extraction head 1.3 intercommunication are equipped with elastic sealing plug 5 on the third opening 3.3. Through implementing above-mentioned technical scheme, can carry out on-the-spot sample to transformer gas. The connecting joint 4 can adopt a quick joint in the prior art, so that the sealing performance can be ensured, and the quick connection of the device can be realized. The elastic sealing plug 5 is tightly plugged in the third through hole 3.3 and can be replaced, so that the insertion of the needle head of the sampling needle tube can be ensured, and the air tightness of the device can be ensured when the needle head of the sampling needle tube is pulled out. When the device is used for sampling gas, the connecting joint 4 is connected with a sampling joint of a gas collecting box of a transformer, the air extractor 1 is pulled, when liquid enters the air extractor 1, the gas in the gas collecting box is emptied, a switch on the sampling joint of the gas collecting box is closed, after the liquid in the first connecting pipe 2 enters the air extractor 1, a needle head of a sampling needle tube is inserted into an elastic sealing plug 5, and a proper amount of gas to be detected is taken out; and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
The air extracting device 1 comprises an air extracting pipe 1.1 and a piston rod 1.2, the first air extracting head 1.3 is communicated with the air extracting pipe 1.1, a piston head 1.4 is arranged at one end of the piston rod 1.2, the air extracting pipe 1.1 is connected with the piston head 1.4 in a sliding mode, and scale marks 1.5 are arranged on the air extracting pipe 1.1. The exhaust tube 1.1 is completely or partially transparent, the position of the piston head of the exhaust tube 1.1 can be observed, and the internal gas volume can be read. The piston rod 1.2 is pulled to generate negative pressure in the exhaust tube, the exhaust function is realized, and the volume of the gas in the exhaust tube 1.1 can be read out through the scale mark 1.5.
The exhaust pipe 1.1 is provided with a second exhaust head 1.6 communicated with the exhaust pipe 1.1, the connecting joint 4 is provided with a three-way joint 6, the first connecting pipe 2 is communicated with the connecting joint 4 through the three-way joint 6, the three-way joint 6 comprises a first interface 6.1, a second interface 6.2 and a third interface 6.3 which are communicated with each other, the first interface 6.1 is communicated with the first connecting pipe 2, the second interface 6.2 is communicated with the connecting joint 4, the third interface 6.3 is communicated with the second exhaust head 1.6 through a second connecting pipe 10, and the third interface 6.3 is provided with a switch valve 12. Through implementing above-mentioned technical scheme, can guarantee that the liquid in first connecting pipe 2 gets into exhaust tube 1.1 completely, can confirm to measure the gas total amount of buchholz relay accurately. The pipe diameter of the first connecting pipe 2 is small, the viscosity of the transformer oil is large, when a switch on a sampling connector of the gas collecting box is turned off, one end, provided with the connecting connector 4, of the first connecting pipe 2 is closed, and due to the air pressure difference principle, liquid in the first connecting pipe 2 is connected and hardly enters the exhaust pipe 1.1 completely, so that the gas volume is inaccurate to measure. When the gas in the gas collecting box is exhausted, the gas appears in the connecting pipeWhen liquid is in use, a switch on the sampling joint of the gas collection box is closed, then the switch valve 12 is opened, the second connecting pipe 10 is communicated with the first connecting pipe 2, a loop can be formed when the switch on the sampling joint of the gas collection box is closed, and the height of the liquid and gas interface in the first connecting pipe 2 is different from the height of the liquid and gas interface in the second connecting pipe 10 at the moment, so that a height difference is formed, the pressure intensity of the two interfaces is different, the liquid can form backflow, and the liquid can completely flow into the exhaust pipe 1.1. After the liquid completely enters the exhaust tube 1.1, the volume V of the gas in the exhaust tube 1.1 is read2Will V2With previously calibrated means, the volume V of gas in the first connecting pipe 2 and other gaps1Adding to obtain the measured gas volume VGeneral assembly. Then inserting the needle head of the sampling needle tube into the elastic sealing plug 5, and taking out a proper amount of gas to be detected; and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
And an air valve 7 is arranged on the connecting joint 4. The gas valve 7 can be closed after the gas in the gas collection box is exhausted, the connecting joint 4 can be detached after the gas valve 7 is closed, and the device can be transferred to other places for other steps.
The piston head 1.4 is provided with a clamping groove 8, a sealing ring 9 is arranged in the clamping groove 8, the inner side of the sealing ring 9 is in contact with the piston head 1.4, and the outer side of the sealing ring 9 is in contact with the inner wall of the exhaust tube 1.1. The structure can ensure the tightness of the sampling device.
The first connecting pipe 2 is a transparent pipe. The condition of the first connecting pipe 2 can be observed, the gas in the gas collecting box is ensured to be completely extracted, and meanwhile, the liquid in the first connecting pipe 2 is completely emptied when the reading is ensured.
The piston rod 1.2 is provided with a hand-pulling piece 11, and the hand-pulling piece 11 is arranged at one end opposite to the piston head 1.4. The structure can facilitate the movement of the piston rod 1.2 during air suction.
The elastic sealing plug 5 is made of rubber. The elastic sealing plug 5 is made of rubber materials, so that the insertion of the needle head of the sampling needle tube can be ensured, and the air tightness of the device can be ensured when the needle head of the sampling needle tube is pulled out.
Example 2:
a transformer gas field sampling method adopts a transformer gas field sampling device, and comprises the following steps:
a. capacity measurement:
a1. putting the connecting joint 4 into the measured liquid, opening the air valve 7 and the switch valve 12, and pulling the piston rod 1.2 to fill each part of the device with the measured liquid;
a2. the piston rod 1.2 is pushed to the bottom, so that the exhaust tube 1.1 is ensured not to have the measured liquid, and the connecting tube and other gaps of the device are ensured to be filled with the measured liquid;
a3. the air valve 7 is closed, and the connecting joint 4 is taken out of the measured liquid;
a4. opening the air valve 7, pulling the piston rod 1.2 to enable all the measured liquid to enter the air exhaust pipe 1.1;
a5. reading out the liquid volume of the exhaust tube 1.1 and recording as the interstitial gas volume V1；
b. Connecting: connecting the connecting joint 4 with a sampling joint of a gas collecting box of a transformer, closing the switch valve 12, opening the air valve 7 of the connecting joint 4, and opening a switch on the sampling joint of the gas collecting box;
c. air suction: pulling the piston rod 1.2 to enable the gas to be measured to enter the exhaust tube 1.1, stopping sucking when continuous liquid appears in the connecting tube, and closing the air valve 7 on the connecting joint 4;
d. standing: opening the switch valve 12, standing the device for a period of time, and allowing all liquid in the connecting pipe to enter the exhaust pipe 1.1;
e. reading: after no liquid exists in the connecting pipe, the gas volume V of the exhaust pipe 1.1 is read2；
f. And (3) calculating: calculating the volume V of the gas to be measuredGeneral assembly，VGeneral assembly＝V1+V2；
g. Sampling: inserting the needle head of the sampling needle tube into the elastic sealing plug 5, and taking out a proper amount of gas to be detected;
h. and (3) detection: and injecting the gas to be detected in the sampling needle tube into a detection instrument for detection.
Through implementing above-mentioned technical scheme, can guarantee the sealed effect of on-the-spot sample to transformer gas on-the-spot sample, the total amount of gas in the measurement gas collection box that simultaneously can be accurate.
The method also comprises the following steps between the step c and the step d:
i. separation: and d, taking the connecting joint 4 off the gas collecting box, transferring the connecting joint to a proper position, and performing step d.
Through implementing above-mentioned technical scheme, can close gas collection box switch after the gas in the gas collection box all gets into sampling device, can take off the device and take to the environment that is more suitable for doing the experiment and test, avoid being in near relay for a long time and operate, to reducing the hidden danger of personal safety.
The invention has the beneficial effects that: the sealing performance is good, and gas leakage or pollution of sample gas caused by external air entering can be effectively avoided; the total gas amount of the gas relay can be accurately measured; simple structure, low manufacturing cost and the like; the device can be taken down to be brought to an environment more suitable for testing, operation near the relay for a long time is avoided, and hidden dangers of personal safety are reduced.
Claims (8)
1. A transformer gas on-site sampling device is characterized by comprising an air extracting device, a first connecting pipe and a communicating pipe, wherein the air extracting device is provided with a first air extracting head, and the communicating pipe comprises a first port, a second port and a third port which are communicated with each other; one end of the first connecting pipe is communicated with the first through hole, the other end of the first connecting pipe is provided with a connecting joint for connecting with a gas relay, the second through hole is communicated with the first air extraction head, and the third through hole is provided with an elastic sealing plug;
the air extracting device comprises an air extracting pipe and a piston rod, and the first air extracting head is communicated with the air extracting pipe; the air exhaust pipe is provided with a second air exhaust head communicated with the air exhaust pipe, the connecting joint is provided with a three-way joint, the first connecting pipe is communicated with the connecting joint through the three-way joint, the three-way joint comprises a first interface, a second interface and a third interface which are mutually communicated, the first interface is communicated with the first connecting pipe, the second interface is communicated with the connecting joint, the third interface is communicated with the second air exhaust head through a second connecting pipe, and the third interface is provided with a switch valve; the piston rod is provided with a hand-pulling piece, and the hand-pulling piece is arranged at one end opposite to the piston head.
2. The transformer gas field sampling device according to claim 1, wherein a piston head is arranged at one end of the piston rod, the exhaust pipe is slidably connected with the piston head, and the exhaust pipe is provided with scale marks.
3. The transformer gas on-site sampling device as claimed in claim 1 or 2, wherein the connecting joint is provided with a gas valve.
4. The transformer gas on-site sampling device according to claim 1 or 2, wherein the piston head is provided with a clamping groove, a sealing ring is arranged in the clamping groove, the inner side of the sealing ring is in contact with the piston head, and the outer side of the sealing ring is in contact with the inner wall of the exhaust pipe.
5. The on-site transformer gas sampling device according to claim 1 or 2, wherein the first connection pipe is a transparent pipe.
6. The on-site transformer gas sampling device according to claim 1 or 2, wherein the elastic sealing plug material is rubber.
7. The transformer gas on-site sampling method adopts the transformer gas on-site sampling device of claim 3, and is characterized by comprising the following steps of:
a. capacity measurement:
a1. putting the connecting joint into the measured liquid, opening the air valve and the switch valve, and pulling the piston rod to fill each part of the device with the measured liquid;
a2. the piston rod is pushed to the bottom, so that the exhaust pipe is ensured not to have the measured liquid, and the first connecting pipe, the second connecting pipe and other gaps of the device are ensured to be filled with the measured liquid;
a3. closing the gas valve and taking the connecting joint out of the measured liquid;
a4. opening the air valve, pulling the piston rod to make all the measured liquid enter the air exhaust pipe;
a5. reading out the liquid volume of the exhaust tube and recording as the gap gas volume V1；
b. Connecting: connecting the connecting joint with a sampling joint of a gas collecting box of a transformer, closing a switch valve, opening an air valve of the connecting joint, and opening a switch on the sampling joint of the gas collecting box;
c. air suction: pulling the piston rod to enable the gas to be detected to enter the exhaust pipe, stopping sucking when continuous liquid appears in the connecting pipe, and closing the air valve on the connecting joint;
d. standing: opening the switch valve, standing the device for a period of time, and allowing all liquid in the connecting pipe to enter the exhaust pipe;
e. reading: after no liquid exists in the connecting pipe, reading the gas volume V of the exhaust pipe2；
f. And (3) calculating: calculating the volume V of the gas to be measuredGeneral assembly= V1+ V2；
g. Sampling: inserting the needle head of the sampling needle tube into the elastic sealing plug, and taking out a proper amount of gas to be detected;
h. and (3) detection: and injecting the gas in the sampling needle tube into a detection instrument for detection.
8. The on-site transformer gas sampling method according to claim 7, further comprising the steps of, between step c and step d:
i. separation: and d, taking the connecting joint down from the gas collecting box, transferring the connecting joint to a proper position, and then performing step d.
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| CN110530687B (en) * | 2019-09-18 | 2022-04-29 | 国网山东省电力公司莱芜供电公司 | Gaseous detection device of SF6 |
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