Multi-transformer non-electric quantity gas on-line monitoring device

Abstract

A multi-transformer non-electric quantity gas on-line monitoring device relates to the technical field of oil-immersed transformer state on-line monitoring, adopts a method of gas adsorbent adsorption, adsorbent particle conveying and final heating desorption, and does not need to perform adsorption passivation, purging and other operations on a gas pipeline. The problem that the consumption of sample gas in a long-distance gas pipeline is large in the operation is solved, and the sampling device is suitable for low-gas-volume transformer non-electric-quantity gas sampling. One on-line monitoring device realizes on-line quantitative analysis of components of a small amount of gas in a plurality of transformer gas relays, so that the cost is reduced; and the waste of manpower and material resources caused by frequent on-site troubleshooting of operation and maintenance personnel due to light gas misoperation is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of online monitoring of oil-immersed transformer states, and in particular to an online monitoring device for non-electrical gas in multiple transformers. Background Art

[0002] The gas relay is a key device that provides non-electrical protection for the transformer. Under normal conditions, the inside of the gas relay is filled with insulating oil. When a serious fault occurs inside the transformer, gases such as CH4, C2H2, C2H4, C2H6, CO, and CO2 will be generated and gathered inside the gas relay, which will then trigger the corresponding contact action and send out a gas alarm signal. It is necessary to detect the gas content in time and analyze the cause of the fault to avoid accidents.

[0003] At present, after a light gas alarm, manual gas sampling is often used on site to detect whether the gas is flammable by igniting it to roughly determine whether it is residual air in the transformer or flammable gas generated by an internal fault. This method is inefficient and cannot detect the gas composition immediately after a light gas alarm. It is difficult to determine the specific type of fault and cannot take targeted measures. There is no special device or operating procedure for manual ignition, and there is a possibility of human error and misoperation. In the operating environment of UHV transformers, if the internal fault of the transformer develops rapidly, there are great safety and fire hazards in manual on-site inspection of gas. In addition, the substation is located in a remote area. Once a gas alarm occurs in the transformer equipment on site, the traditional gas relay gas detection tools and methods cannot accurately analyze the collected gas composition on site. Oil chromatograph analysts need to arrive at the site to take oil samples for analysis, which is time-consuming and inefficient. Since it is impossible to determine whether there is an internal fault in the transformer in time, it may also cause the equipment fault to expand. There is an urgent need for an online monitoring device for transformer non-electrical gas.

[0004] The existing transformer non-electrical gas online monitoring device has the following problems: (1) it can only detect the non-electrical gas of a single transformer, and the device utilization rate is low; (2) the gas is directly detected by the sensor without separation, there is a cross-interference problem between the gas components, and the detection result has a large error. In order to realize the simultaneous online monitoring of multiple transformer gas relays, the transformer non-electrical gas online monitoring device should be located in the middle of multiple gas relays. The gas extraction pipeline is long, and the pipeline dead volume, pipeline purge replacement, pipeline adsorption passivation and other operations will consume a large amount of sample gas (pipelines longer than 2m generally need to be flushed at a flow rate of about 100ml / min for 2-3min), while the gas volume of the light watt alarm value is only 250-300mL, and the gas volume is difficult to meet the monitoring needs. Summary of the invention

[0005] In order to overcome the deficiencies of the above technologies, the present invention provides a multi-transformer non-electrical gas online monitoring device which can detect the components in the gas after separation, eliminate the cross interference between the multiple components, and provide more accurate detection results.

[0006] The technical solution adopted by the present invention to overcome the technical problems is: A multi-transformer non-electrical gas online monitoring device, comprising: N Buchholz relays; N vertically arranged adsorption cabins I, each of which is filled with a gas adsorbent, and the gas outlet of each gas relay is connected to the gas inlet on the top of the corresponding adsorption cabin I through a pipeline via a solenoid valve I; An adsorption cabin II is arranged in a vertical direction, the adsorption cabin II is filled with a gas adsorbent, and a heating unit is arranged on the outside of the adsorption cabin II; A fan, wherein the air inlet end thereof is connected to the carrier gas inlet through a pipeline via a solenoid valve III, the air outlet end of the fan is respectively connected to ball valve IV and ball valve V, the other end of ball valve IV is respectively connected to N ball valves I, solenoid valve II and ball valve III through pipelines, the other end of ball valve I is connected to the top of the corresponding adsorption cabin I, the other end of solenoid valve II is connected to the top of the corresponding adsorption cabin I, the other end of ball valve III is respectively connected to the corresponding ball valve II, ball valve VI and ball valve VII, the other end of ball valve II is connected to the bottom of the corresponding adsorption cabin I, the other end of ball valve VII is connected to the bottom of adsorption cabin II, the other end of ball valve VI is respectively connected to the other end of ball valve V and ball valve VIII, and the other end of ball valve VIII is connected to the top of adsorption cabin II; A reciprocating pump, wherein the air inlet end is connected to the top of the adsorption cabin II and the electromagnetic valve IV through pipelines, the other end of the electromagnetic valve IV is connected to the atmosphere, and the air outlet end is connected to the electromagnetic valve V and the air inlet at the top of the air storage cylinder, the air outlet at the top of the air storage cylinder is connected to the gas concentration detection device through a pipeline via the electromagnetic valve VI, a piston is slidably installed in the air storage cylinder along the vertical direction, and a piston driving mechanism is arranged on the air storage cylinder to drive the piston to move in the vertical direction.

[0007] Preferably, N is a positive integer greater than or equal to 2.

[0008] In order to detect the oil level of the transformer, a liquid level meter is installed at the outlet of the above-mentioned gas relay.

[0009] In order to count the total amount of gas, a flow meter is provided on the pipeline between the solenoid valve I and the air inlet at the top of the adsorption cabin I.

[0010] Preferably, the heating unit is an electric heater.

[0011] In order to buffer the carrier gas, a buffer tank is also included, and the buffer tank is arranged on the pipeline between the fan and the solenoid valve III.

[0012] Furthermore, the piston driving mechanism is an electric push rod installed at the lower end of the gas storage cylinder. The axial direction of the piston rod of the electric push rod is arranged in the vertical direction, and the head end of the piston rod passes through the bottom of the gas storage cylinder and is connected to the lower end surface of the piston.

[0013] Furthermore, the gas concentration detection device is a chromatographic separation column and a gas concentration detector connected to the chromatographic separation column.

[0014] Furthermore, it also includes a six-way valve, a first connection port of the six-way valve is connected to the carrier gas inlet through a pipeline via an electromagnetic valve Ⅶ, a first connection port is connected to the air inlet of a chromatographic separation column, the air outlet of the chromatographic separation column is connected to the air inlet of a gas concentration detector, a third connection port is connected to the sixth connection port of the six-way valve via a quantitative ring, a fifth connection port is connected to the air outlet at the top of the gas storage cylinder via an electromagnetic valve Ⅵ, and a fourth connection port is connected to the atmosphere via an electromagnetic valve VIII.

[0015] In order to facilitate the detection of the air pressure in the air storage cylinder, a pressure sensor connected to the top of the air storage cylinder is also included.

[0016] The beneficial effects of the present invention are: through the method of gas adsorbent adsorption, conveying adsorbent particles, and finally heating and desorption, there is no need for adsorption passivation and purging of the gas pipeline, which solves the problem of large sample gas consumption in long-distance gas pipelines, and is suitable for non-electrical gas sampling of transformers with low gas volume. An online monitoring device can realize online quantitative analysis of the components of a small amount of gas in multiple transformer gas relays, reducing costs; effectively reducing the waste of manpower and material resources caused by frequent on-site inspections by operation and maintenance personnel due to light gas misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; In the figure, 1. gas relay 2. liquid level meter 3. solenoid valve I 4. flow meter 5. adsorption chamber I 6. ball valve I 7. ball valve II 8. solenoid valve II 9. ball valve III 10. ball valve IV 11. ball valve V 12. fan 13. buffer tank 14. solenoid valve III 15. carrier gas inlet 16. adsorption chamber II 17. ball valve VI 18. ball valve VII 19. electric heater 20. ball valve VIII 21. solenoid valve IV 22. reciprocating pump 23. solenoid valve V 24. gas storage cylinder 25. piston 26. electric push rod 27. pressure sensor 28. solenoid valve VI 29. six-way valve 30. solenoid valve VII 31. quantitative ring 32. solenoid valve VIII 33. chromatographic separation column 34. gas concentration detector. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 The present invention is further described.

[0019] A multi-transformer non-electrical gas online monitoring device comprises: N gas relays 1; N vertically arranged adsorption cabins Ⅰ 5, each adsorption cabin Ⅰ 5 is filled with gas adsorbent, and the gas outlet of each gas relay 1 is connected to the gas inlet at the top of the corresponding adsorption cabin Ⅰ 5 through a pipeline via a solenoid valve Ⅰ 3; an adsorption cabin Ⅱ 16, which is arranged in the vertical direction, the adsorption cabin Ⅱ 16 is filled with gas adsorbent, and a heating unit is arranged on the outside of the adsorption cabin Ⅱ 16; a fan 12, the air inlet end of which is connected to the carrier gas inlet 15 through a pipeline via a solenoid valve Ⅲ 14, the air outlet end of the fan 12 is respectively connected to a ball valve Ⅳ 10 and a ball valve Ⅴ 11, the other end of the ball valve Ⅳ 10 is respectively connected to N ball valves Ⅰ 6, solenoid valve Ⅱ 8 and ball valve Ⅲ 9 through pipelines, the other end of the ball valve Ⅰ 6 is connected to the top of the corresponding adsorption cabin Ⅰ 5, and the other end of the solenoid valve Ⅱ 8 is connected to the corresponding adsorption cabin Ⅰ 5, the other end of the ball valve III 9 is respectively connected to the corresponding ball valve II 7, ball valve VI 17 and ball valve VII 18, the other end of the ball valve II 7 is connected to the bottom of the corresponding adsorption cabin I 5, the other end of the ball valve VII 18 is connected to the bottom of the adsorption cabin II 16, the other end of the ball valve VI 17 is respectively connected to the other end of the ball valve V 11 and the ball valve VIII 20, and the other end of the ball valve VIII 20 is connected to the top of the adsorption cabin II 16; a reciprocating pump 22, the air inlet end of which is respectively connected to the top of the adsorption cabin II 16 and the electromagnetic valve IV 21 through pipelines, the other end of the electromagnetic valve IV 21 is connected to the atmosphere, and the air outlet end thereof is respectively connected to the air inlet of the electromagnetic valve V 23 and the top of the air storage cylinder 24, and the air outlet at the top of the air storage cylinder 24 is connected to the top of the air storage cylinder 24 through a pipeline through the electromagnetic valve VI 28 is connected to the gas concentration detection device, a piston 25 is slidably installed in the gas storage cylinder 24 along the vertical direction, and a piston driving mechanism is arranged on the gas storage cylinder 24 to drive the piston 25 to move along the vertical direction.

[0020] The workflow is as follows: S1. The default state of each solenoid valve and ball valve is closed. When a gas relay 1 alarms, the piston driving mechanism drives the piston 25 to the top of the gas storage cylinder 24. At this time, the effective volume in the gas storage cylinder 24 is 0. Open the solenoid valve IV 21, open the ball valve I 6, ball valve III 9, ball valve IV 10, ball valve V 11, ball valve VI 17, ball valve VIII 20, start the reciprocating pump 22, and after the reciprocating pump 22 works, it will pump air, and the pipeline at the front end of the reciprocating pump 22 and the front end of the solenoid valve III 14, the adsorption cabin I 5 and the adsorption cabin II 16, the buffer tank 13, etc. will be vacuumed. The fan 12 is regarded as a passage when it is not working.

[0021] S2. Close the electromagnetic valve IV 21, ball valve I 6, ball valve III 9, ball valve IV 10, ball valve V 11, ball valve VI 17, ball valve VIII 20 and reciprocating pump 22. Then open the first electromagnetic valve I 3, and the gas automatically enters the adsorption cabin I 5 under the action of pressure. When the gas in the adsorption cabin I 5 reaches the set gas volume, close the electromagnetic valve I 3. At this time, the CH4, C2H2, C2H4, C2H6, CO, CO2 and other sample gases in the gas are all fixed in the gas adsorbent in the adsorption cabin I 5.

[0022] S3. Close all solenoid valves and ball valves, then open ball valve II 7, ball valve I 6, ball valve IV 10, ball valve VI 17, ball valve VIII 20, the third solenoid valve 16, and solenoid valve IV 21, start the fan 12 to draw the carrier gas input from the carrier gas inlet 15 into the adsorption cabin I 5, and the carrier gas flow forms a thrust to input the gas adsorbent in the adsorption cabin I 5 from the bottom through the ball valve II 7 and the ball valve VI 17 to the top of the adsorption cabin II 16 and enter the adsorption cabin II 16, and the carrier gas in the adsorption cabin II 16 is discharged into the atmosphere through the solenoid valve IV 21.

[0023] S4. Close all electromagnetic valves, ball valves and blowers, then open electromagnetic valve V 23, start reciprocating pump 22, discharge carrier gas in adsorption chamber II 16 into external atmosphere through electromagnetic valve V 23, and close reciprocating pump 22 and electromagnetic valve V 23. Start the heating unit, raise the temperature inside adsorption chamber II 16 to 150°C, start reciprocating pump 22 and piston drive mechanism, the piston drive mechanism drives piston 25 to move in the direction of increasing volume (downward), adsorption chamber II 16 is heated to heat gas adsorbent, gas is precipitated and then drawn into gas storage cylinder 24, after the gas pressure in gas storage cylinder 24 reaches the set value, close all electromagnetic valves and ball valves, close reciprocating pump 22, close the heating unit, the piston drive mechanism pushes the piston to move so that the gas pressure in the cavity is between 0.10MPa and 0.11MPa, higher than this pressure pushes the piston to move in the direction of increasing volume, otherwise it moves in the direction of decreasing volume.

[0024] S5. Close all electromagnetic valves and ball valves, then open electromagnetic valve VI 28, and the gas enters the gas concentration detection device to measure the concentration value of each component in the gas.

[0025] S6. Close all solenoid valves and ball valves, open ball valve Ⅰ 6, ball valve Ⅲ 9, ball valve Ⅴ 11, ball valve Ⅷ 20, ball valve Ⅶ 18, open solenoid valve Ⅱ 8, solenoid valve Ⅲ 14, start fan 12 to draw carrier gas into adsorption cabin Ⅱ 16, the carrier gas flow forms thrust to release the gas in adsorption cabin Ⅱ 16, and the gas adsorbent enters adsorption cabin Ⅰ 5 from the top of adsorption cabin Ⅰ 5 through ball valve Ⅶ 18, ball valve Ⅲ 9, ball valve Ⅰ 6, and the carrier gas in adsorption cabin Ⅰ 5 is discharged to the external atmosphere from the gas pipeline where solenoid valve Ⅱ 8 is located.

[0026] The multi-transformer non-electrical gas online monitoring device of the present invention quantitatively takes gas and fixes gases such as CH4, C2H2, C2H4, C2H6, CO, CO2 in a gas adsorbent, and transmits the gas adsorbent particles to the adsorption chamber II 16 at the front end of the reciprocating pump 22 through the fan 12, and finally monitors through a gas concentration detection device. The device solves the problem of large-scale consumption of sample gas such as pipeline adsorption passivation, cleaning and purging faced by the above-mentioned gas when it is transmitted to the monitoring module through a long-distance gas pipeline, and has a low gas intake requirement. In addition, the components in the gas are separated and then detected to eliminate cross-interference between multiple components, and the detection results are more accurate.

[0027] In one embodiment of the present invention, N is a positive integer greater than or equal to 2.

[0028] In one embodiment of the present invention, a liquid level meter 2 is installed at the gas outlet of the gas relay 1. The liquid level meter 2 can detect the liquid level of the transformer oil at the gas outlet of the gas relay 1 in real time to prevent the transformer oil from entering the entire online monitoring device.

[0029] In one embodiment of the present invention, a flow meter 4 is provided on the pipeline between the solenoid valve Ⅰ 3 and the air inlet at the top of the adsorption cabin Ⅰ 5. The flow meter 4 can detect the flow rate of the gas delivered by the gas relay 1 in real time.

[0030] In one embodiment of the present invention, the heating unit is an electric heater 19. The installation is simple and the operation is stable.

[0031] In one embodiment of the present invention, a buffer tank 13 is further included, and the buffer tank 13 is arranged on the pipeline between the fan 12 and the solenoid valve III 14. The buffer tank 13 can buffer the carrier gas input from the carrier gas inlet 15 to prevent the fan 12 from delivering insufficient carrier gas.

[0032] In one embodiment of the present invention, the piston driving mechanism is an electric push rod 26 installed at the lower end of the gas storage cylinder 24. The axial direction of the piston rod of the electric push rod 26 is arranged in the vertical direction, and the head end of the piston rod passes through the bottom of the gas storage cylinder 24 and is connected to the lower end surface of the piston 25. The piston rod of the electric push rod 26 extends outward, and drives the piston 25 to move upward. The piston rod of the electric push rod 26 retracts inward, and drives the piston 25 to move downward. The structure is simple and the operation is reliable.

[0033] In one embodiment of the present invention, the gas concentration detection device is a chromatographic separation column 33 and a gas concentration detector 34 connected to the chromatographic separation column 33. The chromatographic separation column 33 is used to separate CH4, C2H2, C2H4, C2H6, CO, and CO2 in the transformer non-electrical gas, and the gas concentration detector 34 detects the concentrations of CH4, C2H2, C2H4, C2H6, CO, and CO2. The chromatographic separation column 33 is used to separate the transformer non-electrical gas with relatively complex components, thereby avoiding the cross-interference phenomenon caused by the non-separation of gas in the traditional sensor detection method and improving the accuracy of the detection result.

[0034] In this embodiment, preferably, a six-way valve 29 is further included, wherein the first connection port of the six-way valve 29 is connected to the carrier gas inlet 15 through a pipeline via a solenoid valve VII 30, the first connection port is connected to the gas inlet of the chromatographic separation column 33, the gas outlet of the chromatographic separation column 33 is connected to the gas inlet of the gas concentration detector 34, the third connection port is connected to the sixth connection port of the six-way valve 29 through a quantitative ring 31, the fifth connection port is connected to the gas outlet at the top of the gas storage cylinder 24 through a solenoid valve VI 28, and the fourth connection port is connected to the atmosphere through a solenoid valve VIII 32. In the initial state, the first interface of the six-way valve 29 is connected to the second interface, the third interface is connected to the fourth interface, and the fifth interface is connected to the sixth interface. The carrier gas enters the chromatographic separation column 33 from the carrier gas inlet 15 through the second interface channel, and the gas in the gas storage cylinder 24 enters the quantitative ring 31 through the sixth interface, and is finally discharged to the atmosphere through the fourth interface. After the set time, the six-way valve 29 is switched to connect the first interface with the sixth interface, and the second interface with the third interface. The carrier gas passes through the sixth interface to send the quantitative gas in the quantitative ring 31 into the chromatographic separation column 33 through the third interface and the second interface for separation, and outputs different component gases in a time sequence and enters the gas concentration detector 34 to detect the gas concentration.

[0035] In one embodiment of the present invention, a pressure sensor 27 is further included which is connected to the top of the gas storage cylinder 24. The pressure sensor 27 can conveniently measure the pressure of the gas in the gas storage cylinder 24, so that the pressure value is between 0.1 MPa and 0.11 MPa. When the pressure value reaches the set value, the piston drive mechanism stops moving and the piston 25 maintains the corresponding position.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-transformer non-electrical gas online monitoring device, characterized in that: include: N Buchholz relays (1); N vertically arranged adsorption chambers I (5), each of which is filled with a gas adsorbent, and the gas outlet of each gas relay (1) is connected to the gas inlet at the top of the corresponding adsorption chamber I (5) through a pipeline via a solenoid valve I (3); An adsorption chamber II (16) is arranged in a vertical direction, the adsorption chamber II (16) is filled with a gas adsorbent, and a heating unit is arranged on the outside of the adsorption chamber II (16); The air inlet end of the fan (12) is connected to the carrier gas inlet (15) through a pipeline via a solenoid valve III (14), and the air outlet end of the fan (12) is respectively connected to the ball valve IV (10) and the ball valve V (11), and the other end of the ball valve IV (10) is respectively connected to N ball valves I (6), solenoid valve II (8) and ball valve III (9) through pipelines, and the other end of the ball valve I (6) is connected to the top of the corresponding adsorption cabin I (5), and the other end of the solenoid valve II (8) is connected to the top of the corresponding adsorption cabin I ( 5), the other end of the ball valve III (9) is respectively connected to the corresponding ball valve II (7), ball valve VI (17) and ball valve VII (18), the other end of the ball valve II (7) is connected to the bottom of the corresponding adsorption cabin I (5), the other end of the ball valve VII (18) is connected to the bottom of the adsorption cabin II (16), the other end of the ball valve VI (17) is respectively connected to the other end of the ball valve V (11) and the ball valve VIII (20), the other end of the ball valve VIII (20) is connected to the top of the adsorption cabin II (16); A reciprocating pump (22) has an air inlet end connected to the top of the adsorption chamber II (16) and the electromagnetic valve IV (21) through pipelines, the other end of the electromagnetic valve IV (21) is connected to the atmosphere, and an air outlet end connected to the electromagnetic valve V (23) and the air inlet at the top of the gas storage cylinder (24), respectively. The air outlet at the top of the gas storage cylinder (24) is connected to the gas concentration detection device through a pipeline via the electromagnetic valve VI (28). A piston (25) is slidably mounted in the gas storage cylinder (24) in a vertical direction. A piston driving mechanism is arranged on the gas storage cylinder (24) for driving the piston (25) to move in the vertical direction.

2. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: N is a positive integer greater than or equal to 2.

3. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: A liquid level meter (2) is installed at the gas outlet of the gas relay (1).

4. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: A flow meter (4) is provided on the pipeline between the solenoid valve I (3) and the air inlet at the top of the adsorption cabin I (5).

5. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: The heating unit is an electric heater (19).

6. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: It also includes a buffer tank (13), wherein the buffer tank (13) is arranged on the pipeline between the fan (12) and the solenoid valve III (14).

7. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: The piston driving mechanism is an electric push rod (26) installed at the lower end of the gas storage cylinder (24). The axial direction of the piston rod of the electric push rod (26) is arranged in the vertical direction, and the head end of the piston rod passes through the bottom of the gas storage cylinder (24) and is connected to the lower end surface of the piston (25).

8. The multi-transformer non-electrical gas online monitoring device according to claim 1 is characterized in that: The gas concentration detection device comprises a chromatographic separation column (33) and a gas concentration detector (34) connected to the chromatographic separation column (33).

9. The multi-transformer non-electrical gas online monitoring device according to claim 8 is characterized in that: It also includes a six-way valve (29), a first connection port of the six-way valve (29) is connected to the carrier gas inlet (15) through a pipeline via an electromagnetic valve VII (30), a first connection port is connected to the gas inlet of a chromatographic separation column (33), a gas outlet of the chromatographic separation column (33) is connected to the gas inlet of a gas concentration detector (34), a third connection port is connected to the sixth connection port of the six-way valve (29) via a quantitative ring (31), a fifth connection port is connected to the gas outlet at the top of the gas storage cylinder (24) via an electromagnetic valve VI (28), and a fourth connection port is connected to the atmosphere via an electromagnetic valve VIII (32).

10. The multi-transformer non-electrical gas online monitoring device according to claim 1, characterized in that: It also includes a pressure sensor (27) connected to the top of the gas storage cylinder (24).

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