Gas relay with gas analysis function

Abstract

The invention relates to a gas relay with a gas analysis function, which comprises a relay body, a gas detection box is arranged on the upper side of the relay body, a gas sensor assembly is arranged in the gas detection box, and the gas detection box is connected with a sample inlet in the relay body through a sample inlet pipe. A floating ball switch is arranged at the top in the relay body, a floating ball of the floating ball switch closes a sample inlet of the relay body when the relay body is filled with oil, and the floating ball of the floating ball switch opens the sample inlet of the relay body when the liquid level in the relay body drops to a certain height. When the transformer has a slight fault, light gas is gathered at the upper part in the gas relay, the floating ball descends along with the liquid level, the sample injection port is opened, the light gas fault gas enters the sample injection pipe from the sample injection port and continues to upwards enter the gas detection box, and the sensor assembly can rapidly detect gas components. And a manager judges the fault problem at the far end through the received gas component data.

Description

Technical Field

[0001] The invention relates to the technical field of gas relays, and in particular to a gas relay with a gas analysis function. Background Art

[0002] The gas relay is installed on the pipeline between the oil storage cabinet and the oil tank of the transformer. The gas relay sends out an alarm signal or activates the protection element by detecting the gas or oil flow surge generated by the internal fault of the transformer. The light and heavy gas protection functions are relatively mature, such as the gas relay with independent heavy gas and oil loss functions disclosed in the authorization announcement number CN111883385B.

[0003] If a discharge or overheating fault occurs inside the transformer, the discharge mainly produces hydrogen, while a serious overheating fault may produce more hydrocarbon gases such as methane and acetylene. The current gas relay cannot directly detect and analyze the light gas fault gas, and cannot accurately determine the specific type of fault. These faults may cause safety problems such as corrosion and explosion in the transformer, seriously affecting the safety and service life of the equipment. Therefore, a gas relay with a light gas gas analysis function is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a gas relay with a gas analysis function, which can monitor the concentrations of hydrogen, methane and acetylene in the transformer gas relay in real time, and realize early warning and diagnosis of internal faults of the transformer.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A gas relay with a gas analysis function comprises a relay body. A gas detection box is arranged on the upper side of the relay body. A gas sensor assembly is arranged in the gas detection box. The gas detection box is connected to a sampling port inside the relay body through a sampling tube. A float switch is arranged at the top of the relay body. When the relay body is full of oil, the float of the float switch closes the sampling port of the relay body. When the liquid level in the relay body drops to a certain height, the float of the float switch opens the sampling port of the relay body.

[0007] Furthermore, the gas sensor assembly includes a hydrogen sensor, a methane sensor, and an acetylene sensor, and the hydrogen sensor, the methane sensor, and the acetylene sensor are all connected to a sensor circuit board.

[0008] Furthermore, the gas detection box is provided with an outlet connector, and the inner end of the outlet connector is electrically connected to the sensor circuit board.

[0009] Furthermore, a side wall of the gas detection box is provided with an exhaust valve.

[0010] Furthermore, an oil-gas separation structure is serially connected to the sample inlet tube.

[0011] Furthermore, the injection tube includes a mixing tube and an air inlet pipe, the oil-gas separation structure includes a separation chamber, the upper end of the mixing tube is connected to the bottom of the separation chamber, and the air inlet pipe is connected to one side of the separation chamber so that the separated gas can be discharged from the side.

[0012] Furthermore, a check valve is provided at one end of the injection tube close to the injection port.

[0013] Furthermore, the float switch includes a float and a rocker arm, one end of the rocker arm is hinged on the top wall in the relay body, and the other end is connected to the float.

[0014] Beneficial effects of the present invention:

[0015] When the transformer is operating normally, the gas relay is full of oil, the float is located at the top of the relay body, the sampling tube is closed, and the transformer oil cannot enter the gas detection box. When a minor fault occurs in the transformer, light gas gathers above the inside of the gas relay, the float drops with the liquid level, and the sampling port opens. The light gas fault gas enters the sampling tube from the sampling port, and a trace amount of oil enters the oil-gas separation structure, where oil-gas separation occurs. After the gas comes out from one side, it continues to enter the gas detection box upward for gas composition analysis. The sensor component analyzes hydrogen, methane, and acetylene in the light gas. The response time of the sensor should be short enough to quickly detect changes in gas composition. The sensor converts the detected gas composition and concentration signals into electrical signals, and the collected data is led to the substation on-site relay cabinet through the circuit board output line.

[0016] The gas detection box is directly fixed on the upper side of the traditional gas relay, with a compact structure. When gas is generated in the gas relay, the float switch can automatically control the collection of fault gas and transmit it to the sensor component for analysis. The sampling method is simple and efficient.

[0017] Furthermore, after the analysis of the generated gas is completed, the gas can be discharged through the exhaust valve, or a gas extraction device can be connected to collect the fault gas for further in-depth research.

[0018] Through reasonable design, the added functional components do not affect the original structure, and the light and heavy gas and oil loss protection functions of the traditional gas relay are retained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural principle diagram of a gas relay with a gas analysis function according to the present invention;

[0020] Figure 2 It is a partial view of the gas relay with gas analysis function of the present invention (float switch closed state);

[0021] Figure 3 It is a partial view of the gas relay with gas analysis function of the present invention (float switch is opened).

[0022] The names corresponding to the marks in the figure are:

[0023] 1. Outlet connector; 2. Gas detection box; 3. Sensor circuit board; 4. Exhaust valve; 5. Relay body; 6. Hydrogen sensor; 7. Methane sensor; 8. Acetylene sensor; 9. Inlet pipe; 10. Oil and gas separation structure; 11. Check valve; 12. Float switch; 13. Float; 14. Rocker; 15. Inlet; A. Liquid level; B. Gas. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] Example:

[0026] like Figure 1-Figure 3 As shown, a gas relay with a gas analysis function includes a relay body 5, which refers to the shell part of a traditional gas relay. After improvement, a gas detection box 2 is arranged on the upper side of the relay body 5 to monitor the concentration of hydrogen, methane and acetylene in the gas relay in real time. Light and heavy gas action components are also arranged in the relay body 5, retaining the original light and heavy gas protection functions.

[0027] A gas sensor assembly is provided in the gas detection box 2, and the gas sensor assembly includes a hydrogen sensor 6, a methane sensor 7, and an acetylene sensor 8, and the hydrogen sensor 6, the methane sensor 7, and the acetylene sensor 8 are all connected to the sensor circuit board 3. The hydrogen sensor 6, the methane sensor 7, and the acetylene sensor 8 are used to monitor the components in the collected sample and the corresponding concentrations of hydrogen, methane, and acetylene.

[0028] The gas detection box 2 is provided with an outlet connector 1 , and the inner end of the outlet connector 1 is electrically connected to the sensor circuit board 3 .

[0029] The gas detection box 2 is connected to the injection port 15 inside the relay body 5 through the injection tube. A float switch 12 is provided at the top of the relay body 5. The float switch 12 includes a float and a swing rod 14. One end of the swing rod 14 is hinged on the top wall inside the relay body 5, and the other end is connected to the float 13. When the relay body 5 is full of oil, the float 13 of the float switch 12 closes the injection port 15. When the liquid level A in the relay body 5 drops to a certain height, the float of the float switch 12 drops, and the injection port 15 is released, that is, the injection port 15 is opened. The lower end surface of the injection port 15 is designed to be concave spherical to fit the surface of the float 13.

[0030] When the transformer is operating normally, the gas relay is full of oil, the float 13 is located at the top of the gas relay, the sampling tube is closed, and the transformer oil cannot enter the gas detection box 2. When a minor fault occurs in the transformer, light gas gathers above the gas relay, the liquid level A drops, the float drops accordingly, and the sampling port 15 opens, and the light gas fault gas B enters the sampling tube from the sampling port 15 and then enters the gas detection box 2 for analysis.

[0031] An oil-gas separation structure 10 is connected in series to the sampling tube. For ease of description, the sampling tube is defined to include a mixing tube and an air inlet pipe 9. The oil-gas separation structure 10 includes a separation chamber. The upper end of the mixing tube is connected to the bottom of the separation chamber. The air inlet pipe 9 is connected to one side of the separation chamber so that the separated gas can be discharged from the side. When the trace oil contained in the sampled gas passes through the separation chamber, the sampled gas moves upward, and the trace oil settles at the bottom of the separation chamber by gravity. The gas enters the gas detection box 2 from one side through the air inlet pipe 9.

[0032] A check valve 11 is provided at one end of the injection tube near the injection port, and the check valve 11 can be threadedly connected to the injection port, and the injection gas can only enter the gas detection box 2 in one direction through the check valve 11. The check valve 11 is a micro check valve; a micro check valve with a model of CVD0.G18.0N.000G1 / 8 thread can be used.

[0033] The side wall of the gas detection box 2 is provided with an exhaust valve 4, and after the gas detection is completed, the gas can be exhausted through the exhaust valve 4. The gas can also be manually collected from the exhaust valve 4 and further brought back to the laboratory for analysis of gas composition and concentration.

[0034] Principle of Buchholz relay with gas analysis function:

[0035] When the transformer is operating normally, the gas relay is full of oil, the float 13 is located at the top of the relay body, the sampling tube is closed, and the transformer oil cannot enter the gas detection box 2. When a minor fault occurs in the transformer, light gas gathers above the inside of the gas relay, the float drops, and after the sampling port is opened, the light gas fault gas B enters the sampling tube from the sampling port 15, and a trace amount of oil enters the oil-gas separation structure 10 to separate oil and gas. After the gas comes out from one side, it continues to enter the gas detection box 2 upward for gas component analysis. The sensor component analyzes hydrogen, methane, and acetylene in the light gas. The response time of the sensor should be short enough to quickly detect changes in gas composition. The sensor converts the detected gas composition and concentration signal into an electrical signal, and the collected data is led to the substation site relay cabinet through the circuit board outlet line. The collected data includes information such as gas composition, concentration, and detection time. After the analysis is completed, the exhaust port can be opened through the exhaust valve 4 to discharge the gas, or the gas extraction device can be connected to collect the fault gas for further research.

[0036] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A gas relay with a gas analysis function, characterized in that: The invention comprises a relay body, a gas detection box is arranged on the upper side of the relay body, a gas sensor assembly is arranged in the gas detection box, the gas detection box is connected with the sampling port inside the relay body through the sampling tube, a float switch is arranged at the top of the relay body, when the relay body is full of oil, the float of the float switch closes the sampling port of the relay body, when the liquid level in the relay body drops to a certain height, the float of the float switch opens the sampling port of the relay body.

2. The gas relay with gas analysis function according to claim 1, characterized in that: The gas sensor assembly comprises a hydrogen sensor, a methane sensor and an acetylene sensor, and the hydrogen sensor, the methane sensor and the acetylene sensor are all connected to a sensor circuit board.

3. The gas relay with gas analysis function according to claim 2, characterized in that: The gas detection box is provided with an outlet connector, and the inner end of the outlet connector is electrically connected to the sensor circuit board.

4. The gas relay with gas analysis function according to claim 1, characterized in that: The side wall of the gas detection box is provided with an exhaust valve.

5. The Buchholz relay with gas analysis function according to claim 1, characterized in that: An oil-gas separation structure is serially connected to the sample injection tube.

6. The Buchholz relay with gas analysis function according to claim 1, characterized in that: The injection tube includes a mixing tube and an air inlet pipe. The oil-gas separation structure includes a separation chamber. The upper end of the mixing tube is connected to the bottom of the separation chamber. The air inlet pipe is connected to one side of the separation chamber so that the separated gas can be discharged from the side.

7. The Buchholz relay with gas analysis function according to claim 1, characterized in that: A check valve is arranged at one end of the injection tube close to the injection port.

8. The Buchholz relay with gas analysis function according to claim 1, characterized in that: The float switch comprises a float and a swing rod, one end of the swing rod is hinged on the top wall in the relay body, and the other end is connected to the float.

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