A transformer gas relay intelligent gas collecting box and control method thereof

Abstract

The invention discloses an intelligent gas collecting box for a transformer gas relay and a control method thereof, which relate to the technical field of transformers. The intelligent gas collecting box comprises a box body 30, in which a device box 28, a gas extraction box 12 and a waste oil box 19 are arranged in sequence from top to bottom. The intelligent gas collecting box can automatically and safely extract gas from the transformer gas relay and can monitor gas composition, and the gas extraction process is automatically triggered by an alarm or an action signal of the gas relay. The intelligent gas collecting box can automatically extract gas by triggering an alarm or an action signal of the gas relay without manual intervention, adopts a solenoid valve series design to avoid erroneous oil discharge caused by a solenoid valve failure, adopts a continuous float liquid level gauge to measure and control the gas extraction and oil discharge capacity to avoid misoperation, adopts a palladium alloy sensor to measure the hydrogen concentration in the gas and give a real-time alarm, supports self-checking of the sensor and the solenoid valve, can automatically give an alarm when a function failure occurs in the gas collecting box to avoid misoperation, and supports the output of a communication signal line.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to an intelligent gas collecting box for a transformer gas relay and a control method thereof. Background Art

[0002] Since the transformer gas relay is usually installed on the connecting pipe between the transformer oil pillow and the transformer oil tank, which is located above the transformer oil tank, when the relay alarms or operates, in order to facilitate personnel to observe the gas capacity inside the gas relay and handle and monitor related gases, a gas collecting box is required to lead the gas in the gas relay to the bottom of the transformer, so as to manually take in and exhaust the gas. During the gas taking process, some transformer oil needs to be discharged.

[0003] At present, traditional gas boxes are all operated manually, using the static oil pressure in the transformer oil pillow to guide and remove gas. During the operation, the gas volume and oil level in the gas box are manually observed to avoid incomplete gas guidance, incomplete exhaust and excessive oil discharge. At the same time, manual operation can also avoid accidental oil discharge or contamination of the internal transformer oil. However, there are always several shortcomings in the application of manually operated gas boxes that need to be improved.

[0004] Problems and shortcomings of existing technologies

[0005] (1) Personnel must be present on site to operate the transformer, which increases personnel safety issues;

[0006] (2) Manual operation requires professional training, takes a long time, and is prone to misoperation and excessive oil discharge;

[0007] (3) The process data of gas extraction and detection needs to be manually entered, the degree of automation is low, and the data error is large. Summary of the invention

[0008] The purpose of the present invention is to provide a transformer gas relay intelligent gas collecting box and a control method thereof, which solves the technical problems of automatic gas extraction and gas composition monitoring, and the gas extraction process is automatically triggered by the gas relay alarm or action signal.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A transformer gas relay intelligent gas collecting box comprises a box body, a device box, a gas extraction box and a waste oil box arranged in the box body from top to bottom;

[0011] The device box is provided with a control module, a sensor, a gas intake solenoid valve, and an exhaust solenoid valve. The sensor, the gas intake solenoid valve, and the exhaust solenoid valve are electrically connected to the control module through different data lines respectively. The control module is connected to an external power supply through a power line. The control module communicates with an external gas relay through a data line.

[0012] The gas extraction box is connected to the external gas relay through the gas guide pipe to obtain the oil transmitted by the external gas relay. The gas extraction solenoid valve is arranged on the gas guide pipe to control the resistance of the gas guide pipe.

[0013] A first float for measuring the liquid level of the oil is arranged in the air extraction box;

[0014] The waste oil box is connected to the gas extraction box through a waste oil pipe for draining oil, and the oil discharge battery valve is arranged on the waste oil pipe to control the resistance of the waste oil pipe;

[0015] The gas extraction box is connected to the waste oil box through an exhaust pipe for extracting gas;

[0016] The waste oil box is provided with an exhaust hole for exhausting air, a second float for measuring the liquid level of the oil and an oil drain pipe for leading out the oil. A manual oil drain valve is arranged on the oil drain pipe for controlling the resistance of the oil drain pipe.

[0017] Preferably, the equipment box, the air extraction box and the waste oil box are separated by a partition.

[0018] Preferably, the oil drain battery valve, the second float and the first float are electrically connected to the control module via different data lines respectively.

[0019] Preferably, a first support rod and a second support rod are respectively provided in the air extraction box and the waste oil box, the first float moves up and down along the first support rod, and the second float moves up and down along the second support rod.

[0020] A control method for an intelligent gas collecting box of a transformer gas relay comprises the following steps:

[0021] Step 1: Establishing a transformer gas relay intelligent gas collecting box;

[0022] Step 2: The control module determines whether there is air in the air extraction box by detecting the position of the first float: if yes, first open the air extraction solenoid valve, then open the exhaust solenoid valve to exhaust, until the first float rises to the top of the air extraction box, indicating that all the air has been exhausted and the air extraction box is full of transformer oil, and then execute step 3; if no, execute step 3;

[0023] Step 3: The control module closes the air intake solenoid valve and the exhaust solenoid valve;

[0024] Step 4: When the external gas relay generates a light gas alarm or a heavy gas action, its alarm and protection action signals are transmitted to the control module, and the automatic gas extraction process includes the following steps:

[0025] Step A1: The control module executes a delay, and after the delay is completed, executes step 4;

[0026] Step A2: The control module controls the opening of the air intake solenoid valve and the oil discharge battery valve to simultaneously take in air and discharge oil;

[0027] Step A3: When the position of the first float drops, it indicates that air is being taken out. When the position of the first float stops dropping, it indicates that the air is taken out. The control module first closes the oil discharge battery valve and then closes the air taking out solenoid valve.

[0028] Step 5: The control module executes a delay, and after the delay is completed, executes step 6;

[0029] Step 6: The control module executes a delay. After the delay is completed, the sensor collects the hydrogen concentration measurement in the gas extraction box, compares the measurement data with the threshold, and performs remote communication and alarm;

[0030] Step 7: Exhaust according to the method of step 2;

[0031] Step 8: Before executing the exhaust or oil draining process from step 2 to step 6, the oil level in the waste oil box needs to be checked by the second float. If the upper limit has been reached, the control module remotely reminds the personnel to empty the waste oil box on site to avoid oil overflow of the transformer;

[0032] Step 9: The control module counts the number of actions and performs self-checks on the oil level and sensor status, thereby closing all solenoid valves under abnormal conditions and issuing remote alarms to remind personnel to handle the situation, thereby ensuring the reliable operation of the device. The sensor is a hydrogen sensor.

[0033] The invention discloses an intelligent gas collecting box for a transformer gas relay and a control method thereof, which solves the technical problems of automatic gas extraction and gas composition monitoring, and the gas extraction process being automatically triggered by a gas relay alarm or action signal. The invention can trigger automatic gas extraction by a gas relay alarm or action signal without manual intervention, adopts a solenoid valve series design to avoid erroneous oil discharge caused by a solenoid valve failure, adopts a continuous float liquid level gauge to measure and control the gas extraction and oil discharge capacity to avoid misoperation, adopts a palladium alloy sensor to measure the hydrogen concentration in the gas and give a real-time alarm, supports sensor and solenoid valve self-inspection, can automatically give an alarm when a gas collecting box fails, avoids misoperation, supports communication signal line output, and can realize remote data transmission, recording and accident recall. The invention can replace the possibility of safety accidents caused by manual on-site gas extraction, and does not affect the safe operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the system architecture of the present invention. DETAILED DESCRIPTION

[0035] Embodiment 1:

[0036] like Figure 1The transformer gas relay intelligent gas collecting box shown in the figure comprises a box body 30, in which a device box 28, a gas extraction box 12 and a waste oil box 19 are arranged in sequence from top to bottom;

[0037] The device box 28 is provided with a control module 7, a sensor 22, a gas intake solenoid valve 23, and an exhaust solenoid valve 9. The sensor 22, the gas intake solenoid valve 23, and the exhaust solenoid valve 9 are electrically connected to the control module 7 through different data lines 21, respectively. The control module 7 is connected to an external power supply through a power line 3. The control module 7 communicates with an external gas relay 1 through a data line 21.

[0038] The gas extraction box 12 is connected to the external gas relay 1 through the gas guide pipe 24, and is used to obtain the oil 26 transmitted from the external gas relay 1. The gas extraction solenoid valve 23 is arranged on the gas guide pipe 24, and is used to control the resistance of the gas guide pipe 24.

[0039] A first float 11 for measuring the liquid level of the oil 26 is provided in the air extraction box 12;

[0040] The waste oil box 19 is connected to the gas extraction box 12 through a waste oil pipe 27 for extracting oil 26, and the oil discharge battery valve 20 is arranged on the waste oil pipe 27 to control the flow resistance of the waste oil pipe 27;

[0041] The gas extraction box 12 is connected to the waste oil box 19 through an exhaust pipe 10 for extracting gas;

[0042] The waste oil box 19 is provided with an exhaust hole 13 for exhausting air, a second float 16 for measuring the liquid level of the oil 26 and an oil drain pipe 18 for conducting the oil 26 . A manual oil drain valve 17 is provided on the oil drain pipe 18 for controlling the resistance of the oil drain pipe 18 .

[0043] Preferably, the equipment box 28, the air extraction box 12 and the waste oil box 19 are separated by a partition.

[0044] Preferably, the oil drain battery valve 20 , the second float 16 and the first float 11 are electrically connected to the control module 7 via different data lines 21 , respectively.

[0045] Preferably, a first support rod 31 and a second support rod 16 are respectively provided in the air extraction box 12 and the waste oil box 19 , the first float 11 moves up and down along the first support rod 31 , and the second float 15 moves up and down along the second support rod 16 .

[0046] In this embodiment, the control module 7 includes an MCU and its peripheral circuits, and the model of the MCU is STM32F407ZGT6.

[0047] The model of sensor 22 is GTM-70;

[0048] Embodiment 2:

[0049] The control method of a transformer gas relay intelligent gas collecting box described in Example 2 is implemented on the basis of a transformer gas relay intelligent gas collecting box described in Example 1, and includes the following steps:

[0050] Step 1: Establishing a transformer gas relay intelligent gas collecting box;

[0051] Step 2: The control module 7 determines whether there is air in the air extraction box 12 by detecting the position of the first float 11: if yes, first open the air extraction solenoid valve 23, then open the exhaust solenoid valve 9 to exhaust, until the first float 11 rises to the top of the air extraction box 12, indicating that all the air has been exhausted and the air extraction box 12 is full of transformer oil 26, and then execute step 3; if no, execute step 3;

[0052] Step 3: The control module 7 closes the air intake solenoid valve 23 and the exhaust solenoid valve 9;

[0053] Step 4: When the external gas relay 1 generates a light gas alarm or a heavy gas action, its alarm and protection action signals are transmitted to the control module 7, and the automatic gas extraction process is entered, which specifically includes the following steps:

[0054] Step A1: the control module 7 executes a delay, and then executes step 4 after the delay is completed;

[0055] Step A2: the control module 7 controls the opening of the air intake solenoid valve 23 and the oil discharge battery valve 20 to take in air and discharge oil at the same time;

[0056] Step A3: When the position of the first float 11 drops, it indicates that air is being taken out. When the position of the first float 11 stops dropping, it indicates that the air is taken out. The control module 7 first closes the oil discharge battery valve 20 and then closes the air taking out solenoid valve 23.

[0057] Since the external gas relay is connected to the transformer oil pillow and the pressure is greater than the air extraction box pressure, when the air extraction solenoid valve and the oil drain solenoid valve are opened at the same time, the faulty gas in the gas relay will be pressed into the air extraction box, and the gas will stay on the upper part of the air extraction box. When all the gas enters the air extraction box, the oil will be pressed into the air extraction box and discharged from the oil drain port below, and the liquid level will no longer drop.

[0058] Step 5: The control module 7 executes a delay, and then executes step 6 after the delay is completed;

[0059] Step 6: The control module 7 executes a delay. After the delay is completed, the hydrogen concentration measurement in the gas extraction box 12 obtained by the acquisition sensor 22 is collected, and the measurement data is compared with the threshold value, and remote communication and alarm are performed;

[0060] Step 7: Exhaust according to the method of step 2;

[0061] Step 8: Before executing the exhaust or oil draining process from step 2 to step 6, the oil level in the waste oil box 19 needs to be checked by the second float 16. If the oil level has reached the upper limit, the control module 7 remotely reminds the personnel to empty the waste oil box 19 on site to avoid oil overflow of the transformer;

[0062] Step 9: The control module 7 counts the number of actions and performs self-checks on the oil level and the status of the sensor 22, thereby closing all solenoid valves under abnormal conditions and issuing remote alarms to remind personnel to handle the process, thereby ensuring the reliable operation of the device. The sensor 22 is a hydrogen sensor.

[0063] The invention discloses an intelligent gas collecting box for a transformer gas relay and a control method thereof, which solves the technical problems of automatic gas extraction and gas composition monitoring, and the gas extraction process being automatically triggered by a gas relay alarm or action signal. The invention can trigger automatic gas extraction by a gas relay alarm or action signal without manual intervention, adopts a solenoid valve series design to avoid erroneous oil discharge caused by a solenoid valve failure, adopts a continuous float liquid level gauge to measure and control the gas extraction and oil discharge capacity to avoid misoperation, adopts a palladium alloy sensor to measure the hydrogen concentration in the gas and give a real-time alarm, supports sensor and solenoid valve self-inspection, can automatically give an alarm when a gas collecting box fails, avoids misoperation, supports communication signal line output, and can realize remote data transmission, recording and accident recall. The invention can replace the possibility of safety accidents caused by manual on-site gas extraction, and does not affect the safe operation of the transformer.

Claims

1. An intelligent gas collecting box for a transformer gas relay, characterized in that: The invention comprises a box body (30), wherein a device box (28), a gas extraction box (12) and a waste oil box (19) are sequentially arranged in the box body (30) from top to bottom; A control module (7), a sensor (22), a gas intake solenoid valve (23), and an exhaust solenoid valve (9) are arranged in the device box (28); the sensor (22), the gas intake solenoid valve (23), and the exhaust solenoid valve (9) are electrically connected to the control module (7) via different data lines (21), respectively; the control module (7) is connected to an external power supply via a power line (3), and the control module (7) communicates with an external gas relay (1) via a data line (21); The gas extraction box (12) is connected to the external gas relay (1) via the gas guide pipe (24) and is used to obtain the oil (26) transmitted by the external gas relay (1). The gas extraction solenoid valve (23) is arranged on the gas guide pipe (24) and is used to control the flow resistance of the gas guide pipe (24); A first float (11) for measuring the liquid level of the oil (26) is arranged in the air extraction box (12); The waste oil box (19) is connected to the gas extraction box (12) through a waste oil pipe (27) for draining oil (26); an oil discharge battery valve (20) is arranged on the waste oil pipe (27) for controlling the flow resistance of the waste oil pipe (27); The gas extraction box (12) is connected to the waste oil box (19) through an exhaust pipe (10) for extracting gas; The waste oil box (19) is provided with an exhaust hole (13) for exhausting air, a second float (15) for measuring the liquid level of the oil (26), and an oil drain pipe (18) for draining the oil (26); a manual oil drain valve (17) is provided on the oil drain pipe (18) for controlling the flow resistance of the oil drain pipe (18); The control module (7) includes an MCU and its peripheral circuits, and the model of the MCU is STM32F407ZGT6; The model of the sensor (22) is GTM-70; A first support rod (31) and a second support rod (16) are respectively provided in the air extraction box (12) and the waste oil box (19); the first float (11) moves up and down along the first support rod (31); and the second float (15) moves up and down along the second support rod (16).

2. The intelligent gas collecting box for a transformer gas relay according to claim 1, characterized in that: The equipment box (28), the air extraction box (12) and the waste oil box (19) are all separated by a partition.

3. The intelligent gas collecting box for a transformer gas relay according to claim 1, characterized in that: The oil drain battery valve (20), the second float (15) and the first float (11) are electrically connected to the control module (7) via different data lines (21) respectively.

4. A control method for an intelligent gas collecting box of a transformer gas relay, characterized in that: The steps include: Step 1: Establish a transformer gas relay intelligent gas collecting box as described in any one of claims 1-3; Step 2: The control module (7) determines whether there is air in the air extraction box (12) by detecting the position of the first float (11). If yes, the air extraction solenoid valve (23) is first opened, and then the exhaust solenoid valve (9) is opened to exhaust air until the first float (11) rises to the top of the air extraction box (12), indicating that all the air has been exhausted and the air extraction box (12) is filled with transformer oil (26), and step 3 is executed; if no, step 3 is executed; Step 3: The control module (7) closes the air intake solenoid valve (23) and the exhaust solenoid valve (9); Step 4: When the external gas relay (1) generates a light gas alarm or a heavy gas action, its alarm and protection action signals are transmitted to the control module (7), and the automatic gas extraction process specifically includes the following steps: Step A1: the control module (7) executes a delay, and after the delay is completed, executes step 4; Step A2: the control module (7) controls the opening of the air intake solenoid valve (23) and the oil discharge battery valve (20) to simultaneously take in air and discharge oil; Step A3: When the position of the first float (11) drops, it indicates that air is being taken out. When the position of the first float (11) stops dropping, it indicates that air is taken out. The control module (7) first closes the oil discharge battery valve (20) and then closes the air taking out solenoid valve (23); Step 5: The control module (7) executes a delay, and after the delay is completed, executes step 6; Step 6: the control module (7) executes a delay, and after the delay is completed, the hydrogen concentration measurement in the gas extraction box (12) obtained by the sensor (22) is collected, and the measured data is compared with the threshold value, and remote communication and alarm are performed; Step 7: Exhaust according to the method of step 2; Step 8: Before executing the exhaust or oil draining process from step 2 to step 6, the oil level in the waste oil box (19) needs to be checked by the second float (15). If the oil level has reached the upper limit, the control module (7) remotely reminds the personnel to empty the waste oil box (19) on site to avoid oil overflow of the transformer; Step 9: The control module (7) counts the number of actions and performs self-checks on the oil level and the status of the sensor (22), thereby closing all solenoid valves under abnormal conditions and issuing remote alarms to remind personnel to handle the situation, thereby ensuring the reliable operation of the device. The sensor (22) is a hydrogen sensor.

Images