A gas relay
By changing the oil tank structure of the light gas protective part of the gas relay to a floating block type and adding a memory device to the heavy gas part, the problem of complex structure and easy damage in the prior art is solved, and more reliable fault detection and accidents are achieved Type judgment.
Patent Information
- Application Number
- CN202010268346.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-04-08
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2040-04-08
AI Technical Summary
When existing gas relays detect light and heavy gas failures, their structure is complex and easy to damage, resulting in unstable contact signal output, making it difficult to accurately judge the type of accident.
The oil tank lever structure of the light gas protection part is changed to a floating block structure, and a memory device is added to the heavy gas part to record the movement of the flow velocity plate to facilitate the judgment of the type of accident.
It improves the reliability and structural stability of light gas fault detection, simplifies components, reduces the risks of deformation and cracking, and facilitates the judgment of heavy gas fault types through memory devices, improving maintenance convenience.
Smart Images
Figure CN111261456B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of transformer protection relays, and in particular relates to a gas relay. Background Art
[0002] The functions of the gas relays currently supplied on the market for protecting oil-immersed transformers are light gas and heavy gas protection. When a light gas or heavy gas fault occurs in the transformer, the gas relay provides a contact signal output to the transformer's protection device, thereby realizing sound and light alarms or cutting off the power supply of the transformer, thereby achieving the purpose of protecting the transformer.
[0003] The main contents of light gas are:
[0004] 1) Air enters the transformer due to oil filtration or oil filling or loose cooling system;
[0005] 2) The oil level is lower than the light gas float of the gas relay due to temperature drop or oil leakage;
[0006] 3) Transformer failure produces a small amount of gas;
[0007] 4) A through fault occurs.
[0008] The main contents of heavy gas are:
[0009] 1) A serious fault occurs inside the transformer;
[0010] 2) There is a fault in the gas circuit;
[0011] 3) A through fault occurs in the nearby area.
[0012] Take QJ-50 gas relay as an example. Figure 4 As shown. The interfaces on the left and right sides of the shell are connected to the oil in the transformer. When the transformer is running, all the parts in the shell cavity are immersed in the transformer oil. The oil tank is also filled with oil and connected to the counterweight through a rod. The counterweight and the oil tank are supported by shaft 2, and the oil tank is maintained in a horizontal position in the oil in the form of a lever. The distance between the counterweight and shaft 2 can be adjusted through the thread on the rod to adjust the balancing torque so that the oil tank is in a horizontal state in the transformer oil.
[0013] When the transformer is caused by light gas, the temperature drops and oil leaks, the liquid level of the oil in the transformer will drop. When the liquid level of the oil drops below the upper opening of the oil tank, the transformer oil in the oil tank will not flow out. When the liquid level of the oil continues to drop, the buoyancy of the transformer oil decreases, and its gravity increases. Under the action of the lever principle, the oil tank begins to rotate clockwise and drop. When the liquid level of the transformer oil drops to the set position, the magnet 2 fixed outside the oil tank approaches the reed switch 2, and the contact in the reed switch 2 moves, and the contact signal is sent to the junction box through the wire and the terminal. The other end of the terminal in the junction box sends the contact signal to the transformer protection device, which sends an audible and visual alarm signal or lets the transformer protection device cut off the power supply to protect the transformer from further expansion of the accident. This part of the protection provides output contact signals for transformer light gas faults.
[0014] If the transformer has a serious internal fault due to heavy gas, the oil inside the transformer will surge due to local overheating and other reasons. The direction of this surge is from the left port to the right port of the shell. The velocity plate is pushed by the surge, causing the velocity plate to rotate counterclockwise around axis 1. The velocity plate also drives the attached magnet 1 to swing right. When the magnet 1 approaches the reed switch 1 to a certain distance, the reed switch 1 sends a contact signal. This signal is sent to the junction box through the wires and terminals in the shell. The external protection device obtains the contact signal from the terminals in the junction box.
[0015] The space inside the junction box and the space inside the shell cavity are sealed and isolated from each other.
[0016] Figure 4 Among them, 01 is the shell; 02 is the magnet 1; 03 is the flow plate; 04 is the reed switch 1; 05 is the shaft 1; 06 is the counterweight; 07 is the shaft 2; 08 is the terminal box; 09 is the terminal; 010 is the oil tank; 011 is the magnet 2; 012 is the reed switch 2. Summary of the invention
[0017] like Figure 1As shown, the content of the present invention is to change the oil tank lever type structure of the light gas protection part into a floating block type structure. The specific gravity of the first floating block 9 is less than the specific gravity of the transformer oil, and the first floating block 9 can move up and down along the guide rod 7. When the housing 1 is full of transformer oil, the first floating block 9 floats to the upper limited position under the action of buoyancy. When the oil level of the transformer oil drops, the first floating block 9 will also drop with the drop of the oil level. When the first floating block 9 drops to the set position, that is, the position of the light gas alarm, the second magnet 10 fixed on the first floating block 9 approaches the second reed switch 8, and the contact in the second reed switch 8 is actuated. The contact signal of the second reed switch 8 is sent to the protection device of the transformer through the wires, the terminal and the junction box of the gas relay inside the housing 1. The purpose of sound and light alarm or power cut-off is achieved, and the transformer is protected from the expansion or spread of the accident that occurred in the transformer. The advantages of this part of the present invention are: compared with the QJ-50 type gas relay, the number of components used is small, and the structure of the floating block 2 used is relatively simple, and it is not easy to deform and crack. The original oil tank and the lever fulcrum structure had complex adhesive and were prone to cracking, which affected the action of the gas relay and prevented the contact signal from being output.
[0018] For the heavy gas part, the present invention adds a memory device 14 in the housing 1. Its purpose is that when a heavy gas failure occurs, not only the first reed switch 4 outputs a contact signal, but also gives a memory indication of the action of the velocity plate 3. This action indication also includes the possible action of the velocity plate 3, while the first reed switch 4 is not triggered. In other words, as long as the velocity plate has a more obvious action, it can be recorded by the memory device 14. The advantage of adding a memory device 14 is that it is easy to directly determine the type of accident. Paint the pointer 17 red for easy observation, which is of great benefit to equipment maintenance personnel in quickly identifying the type of accident and the status of the equipment.
[0019] When heavy gas occurs, the velocity plate 3 is driven by the surge of oil. When it rotates counterclockwise around the first axis 5, the protrusion on the velocity plate 3 hits the lower part of the memory device 14, causing the memory device 14 to rotate counterclockwise around the second axis 12. The memory device 14 is equipped with a second float 18. When the memory device 14 rotates counterclockwise to a certain angle to the right of the vertical center line of the second axis 12, the second float 18 continues to rotate the memory device 14 counterclockwise under the action of buoyancy. Until the sliding column 19 on the memory device 14 is limited by the upper end of the arc-shaped hole of the limit plate 13, the memory device 14 can no longer rotate. At this time, the angle of rotation of the pointer 17 on the memory device 14 has a visual indication function.
[0020] A third magnet 16 is fixedly mounted on the memory device 14, and its function is to indicate the reset of the memory device 14. Since the space inside the housing of the gas relay is filled with transformer oil and is sealed, the third magnet 16 cannot be directly reset after the heavy gas fault is eliminated. The method is to use a magnet outside the gas relay to attract the third magnet 16 on the memory device 14 through the observation window to pull the memory device 14 back to the starting position. This starting position is located on the left side of the vertical center line of the second shaft 12, and the memory device 14 is restricted by the limit plate 13 from continuing to rotate clockwise. The buoyancy of the transformer oil cannot allow the memory device 14 to continue to rotate and get positioned.
[0021] The reed switch is a commercially available product.
[0022] Technical solution of the present invention
[0023] A gas relay comprises: a housing, a first magnet, a velocity plate, a first reed switch, a second reed switch, a guide rod, a first floating block and a second magnet; the characteristics are as follows: the guide rod is fixedly mounted at a set position in the housing, a hole is opened on the first floating block in the housing, the guide rod is sleeved in the hole opened on the first floating block, and the first floating block moves up and down along the axial direction of the guide rod; limit blocks are installed above and below the guide rod to limit the up and down movement range of the first floating block; a second magnet is fixed at the lower part of the first floating block, and a second reed switch is fixedly mounted below the guide rod in the housing and is located below the second magnet; when the second magnet moves downward to the set position, the contact in the second reed switch is actuated; when the second magnet moves upward to the set position, the contact in the second reed switch returns to its original state; the action signal of the contact in the second reed switch is transmitted to the junction box through the wires arranged in the housing and the terminal posts that pass through the junction box wall in a sealed manner; a velocity plate is installed below the second reed switch in the housing, and the velocity plate is installed on the first axis On the upper part, one end of the tension spring is connected to the tension adjustment member 11 in the shell, and the other end of the tension spring is connected to the upper part of the velocity plate, which is higher than the hole connected to the first axis in the middle of the velocity plate; the top of the velocity plate is limited to the set position by the limit plate in the shell, and does not continue to rotate clockwise; the first reed switch is fixedly installed below the tension adjustment member 11, and the first magnet is fixedly installed on the right side of the lower end of the velocity plate. The first magnet rotates counterclockwise with the velocity plate, driving the first magnet to move to the right. When the first magnet approaches the first reed switch to the set distance, the contact in the first reed switch is actuated; the first magnet moves to the left to the set position, and the contact in the first reed switch returns to its original state; the action signal of the contact in the first reed switch is transmitted to the junction box through the wire set in the shell and the terminal sealed through the wall of the junction box; a second axis is fixedly installed at the set position of the shell, and a memory device is installed through the second axis; a limit plate is fixedly installed at the set position of the shell, and the limit plate is used to limit the action range of the memory device.
[0024] The memory device is mainly composed of a crank, a third magnet, a pointer, a second floating block and a slide column; the lower end of the crank is fixedly connected to the outer cylindrical surface of the second floating block, and the end surface of one side of the second floating block is fixedly equipped with a slide column.
[0025] A third magnet is fixedly mounted on the end surface of the other side of the second floating block, and a pointer is fixedly connected to the upper end of the crank, on the same side as the third magnet;
[0026] An arc-shaped long hole is opened on the limit plate, and the two ends of the arc-shaped long hole are the two extreme limit ends of the swing of the memory device; the sliding column on the memory device is placed in the arc-shaped long hole; the extreme position of the clockwise swing of the sliding column on the memory device is located on the left side of the vertical center axis of the second shaft, the flow rate plate rotates counterclockwise to the set angle, and the set raised part on it hits the memory device to rotate counterclockwise, and the vertical center line of the second floating block on the memory device passes through the vertical center axis of the second shaft to the right side of the vertical center axis of the second shaft.
[0027] There are multiple guide rods, and the axes of the multiple guide rods are parallel to each other and fixed at set positions in the shell cavity. The corresponding first floating blocks are provided with multiple matching guide holes.
[0028] There are multiple second reed switches. When the second magnet moves downward to a set position, the contacts in the multiple second reed switches are actuated; when the second magnet moves upward to a set position, the contacts in the multiple second reed switches return to their original state.
[0029] There are multiple first reed switches. When the first magnet moves rightward to a set position, the contacts in the multiple first reed switches are actuated; when the first magnet moves leftward to a set position, the contacts in the multiple first reed switches return to their original states.
[0030] The invention has the advantages of using the floating position change of the first floating block in the transformer oil to judge the light gas fault. Compared with the original lever principle to judge the light gas fault, it has the advantages of fewer components, simple structure and high working reliability. Due to structural reasons, the transformer oil temperature often changes cyclically in the original oil tank design, the position of the oil surface in the transformer changes frequently, causing the oil tank to swing repeatedly. After a long time, the oil tank is prone to cracking locally, affecting the working performance.
[0031] The added memory device provides an indication signal for the action of the heavy gas, making it easier for maintenance personnel to observe and judge the type of accident. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 This is a schematic diagram of the structure of a gas relay of the present invention;
[0033] Figure 2 is a schematic diagram of the memory device structure;
[0034] Figure 3 for Figure 2 Left view of
[0035] Figure 4 This is a schematic diagram of the structure of the QJ-50 gas relay. DETAILED DESCRIPTION
[0036] Example 1
[0037] A gas relay comprises: a housing 1, a first magnet 2, a velocity plate 3, a first reed switch 4, a second reed switch 8, a guide rod 7, a first floating block 9 and a second magnet 10; characterized in that: the guide rod 7 is fixedly mounted at a set position in the housing 1, a hole is opened on the first floating block 9 in the housing 1, the guide rod 7 is sleeved in the hole opened on the first floating block 9, and the first floating block 9 moves up and down along the axis direction of the guide rod 7; limit blocks are installed above and below the guide rod 7 to limit the up and down movement range of the first floating block 9; a second floating block 9 is fixed at the lower part of the first floating block 9 The second reed switch 8 is fixedly mounted below the guide rod 7 in the housing 1 and is located below the second magnet 10; when the second magnet 10 moves downward to a set position, the contact in the second reed switch 8 is actuated; when the second magnet 10 moves upward to a set position, the contact in the second reed switch 8 returns to its original state; the action signal of the contact in the second reed switch 8 is transmitted to the junction box through the wires arranged in the housing 1 and the terminal that passes through the junction box wall in a sealed manner; a velocity plate 3 is mounted below the second reed switch 8 in the housing 1, and the velocity plate 3 is mounted on the first On the shaft 5, one end of the tension spring 6 is connected to the tension adjustment piece 11 in the shell 1, and the other end of the tension spring 6 is connected to the upper part of the velocity plate 3, which is higher than the hole connected to the first shaft 5 in the middle of the velocity plate 3; the top of the velocity plate 3 is limited to the set position by the limit plate in the shell 1, and does not continue to rotate clockwise; the first reed switch 4 is fixedly installed under the tension adjustment piece 11, and the first magnet 2 is fixedly installed on the right side of the lower end of the velocity plate 3. The first magnet 2 rotates counterclockwise with the velocity plate 3, driving the first magnet 2 to move rightward, and the first magnet 2 is close to the first reed switch 4. When the set distance is reached, the contact in the first reed switch 4 is actuated; the first magnet 2 moves leftward to the set position, and the contact in the first reed switch 4 returns to its original state; the action signal of the contact in the first reed switch 4 is transmitted to the junction box through the wires arranged in the housing 1 and the terminal sealed through the wall of the junction box; a second shaft 12 is fixedly mounted at the set position of the housing 1, and a memory device 14 is installed through the second shaft 12; a limit plate 13 is fixedly mounted at the set position of the housing 1, and the limit plate 13 is used to limit the action range of the memory device 14.
[0038] like Figure 1As shown, this embodiment has the function of a light gas relay, but the mechanical transmission method used is completely different. It also has the function of a heavy gas relay, and at the same time adds the indication function of a heavy gas fault accident. It is convenient for on-site maintenance personnel to observe and indicate the signal function. The first floating block 9 is made of foam rubber, and its specific gravity is less than that of transformer oil.
[0039] Example 2
[0040] Embodiment 2 of a gas relay is substantially the same as Embodiment 1, except that:
[0041] The memory device 14 is mainly composed of a crank 15, a third magnet 16, a pointer 17, a second floating block 18 and a slide post 19; the lower end of the crank 15 is fixedly connected to the outer cylindrical surface of the second floating block 18, the end surface of one side of the second floating block 18 is fixedly equipped with the slide post 19, the end surface of the other side of the second floating block 18 is fixedly equipped with the third magnet 16, and the pointer 17 is fixedly connected to the upper end of the crank 15, on the same side as the third magnet 16;
[0042] An arc-shaped long hole is provided on the limit plate 13, and the two ends of the arc-shaped long hole are the two extreme limit ends of the swing of the memory device 14; the sliding column 19 on the memory device 14 is placed in the arc-shaped long hole; the extreme position of the clockwise swing of the sliding column 19 on the memory device 14 is located on the left side of the vertical center axis of the second shaft 12, the velocity plate 3 rotates counterclockwise to a set angle, and the set raised part on it hits the memory device 14 to rotate counterclockwise, and the vertical center line of the second floating block 18 on the memory device 14 passes through the vertical center axis of the second shaft 12 to the right side of the vertical center axis of the second shaft 12.
[0043] like Figure 1 As shown, when the memory device 14 is immersed in transformer oil, the transformer oil has buoyancy on the memory device 14. The second floating block 18 on the memory device 14 is made of foam rubber, and its specific gravity is less than that of transformer oil. This embodiment describes the detailed structure of the memory device 14.
[0044] In the original state of the memory device 14, the center of gravity of the second floating block 18 is on the left side of the vertical central axis of the second shaft 12. At this time, the memory device 14 rotates clockwise under the buoyancy of the second floating block 18. The left end of the arc-shaped hole on the limiting plate 13 is restricted, and the memory device 14 cannot continue to rotate clockwise and is positioned.
[0045] The velocity plate 3 rotates counterclockwise to a set angle, and the set convex part on it hits the memory device 14 to rotate counterclockwise. When the center of gravity of the second floating block 18 on the memory device 14 moves to the right side of the vertical central axis of the second shaft 12, the buoyancy of the transformer oil on the second floating block 18 causes the memory device 14 to continue to rotate counterclockwise until the right end of the arc-shaped hole on the limit plate 13 is limited, causing the memory device 14 to stop and position. This action process of the memory device 14 realizes a memory indication of heavy gas faults.
[0046] When the heavy gas fault of the transformer is repaired, the third magnet 16 on the memory device 14 is attracted by an external magnet through the transparent window of the gas relay, so that the memory device 14 returns to the initial position.
[0047] Example 3
[0048] Embodiment 3 of a gas relay is substantially the same as Embodiment 1, except that:
[0049] There are two guide rods 7, and the axes of the two guide rods 7 are parallel to each other and fixed at set positions in the cavity of the shell 1. The first floating block 9 connected to them is provided with a plurality of matching guide holes.
[0050] Considering that the first floating block 9 has a good stable motion state under the action of the buoyancy of the transformer oil, a guide rod 7 is added.
[0051] Example 4
[0052] Embodiment 4 of a gas relay is substantially the same as embodiment 1, except that:
[0053] There are two second reed switches 8. When the second magnet 10 moves downward to a set position, the contacts in the two second reed switches 8 are actuated; when the second magnet 10 moves upward to a set position, the contacts in the two second reed switches 8 return to their original state.
[0054] Example 5
[0055] There are two first reed switches 4. When the first magnet 2 moves rightward to a set position, the contacts in the two first reed switches 4 are actuated; when the first magnet 2 moves leftward to a set position, the contacts in the two first reed switches 4 return to their original states.
[0056] Usually, a pair of contact signals in the same state output by a relay is not enough for a relay protection system. In this embodiment, the number of reed switches is set to two, that is, two pairs of contact signals are output.
Claims
1. A gas relay comprising: The invention comprises a housing (1), a first magnet (2), a velocity plate (3), a first reed switch (4), a second reed switch (8), a guide rod (7), a first floating block (9), a second magnet (10), and a junction box; the invention is characterized in that: the guide rod (7) is fixedly mounted at a set position in the housing (1); a hole is provided on the first floating block (9) in the housing (1); the guide rod (7) is sleeved in the hole provided on the first floating block (9); the first floating block (9) moves up and down along the axis direction of the guide rod (7); limit blocks are provided above and below the guide rod (7) to limit the up and down movement range of the first floating block (9); a hole is fixed at the lower part of the first floating block (9); A second magnet (10) is fixedly provided with a second reed switch (8) below the guide rod (7) in the housing (1) and is located below the second magnet (10); when the second magnet (10) moves downward to a set position, the contact in the second reed switch (8) is actuated; when the second magnet (10) moves upward to a set position, the contact in the second reed switch (8) returns to its original state; an actuation signal of the contact in the second reed switch (8) is transmitted to the junction box through a wire arranged in the housing (1) and a terminal sealed and passing through the wall of the junction box; a velocity plate (3) is provided below the second reed switch (8) in the housing (1), and the velocity plate (3) is provided at the first On a shaft (5), one end of a tension spring (6) is connected to a tension adjustment member (11) in a housing (1), and the other end of the tension spring (6) is connected to the upper part of the velocity plate (3), higher than the hole in the middle of the velocity plate (3) connected to the first shaft (5); the top end of the velocity plate (3) is limited by a limit plate in the housing (1) to be placed in a set position and does not continue to rotate clockwise; the first reed switch (4) is fixedly mounted below the tension adjustment member (11), and the first magnet (2) is fixedly mounted on the right side of the lower end of the velocity plate (3); the first magnet (2) rotates counterclockwise with the velocity plate (3), driving the first magnet (2) to move rightward, and the first magnet (2) is close to the first When the reed switch (4) reaches a set distance, the contact in the first reed switch (4) is actuated; the first magnet (2) moves leftward to a set position, and the contact in the first reed switch (4) returns to an original state; an actuation signal of the contact in the first reed switch (4) is transmitted to the junction box via a wire arranged in the housing (1) and a terminal sealed and passing through the wall of the junction box; a second shaft (12) is fixedly mounted at the set position of the housing (1), and a memory device (14) is mounted via the second shaft (12); a limit plate (13) is fixedly mounted at the set position of the housing (1), and the limit plate (13) is used to limit the action range of the memory device (14).
2. A gas relay according to claim 1, characterized in that: The memory device (14) is mainly composed of a crank (15), a third magnet (16), a pointer (17), a second floating block (18) and a slide column (19); the lower end of the crank (15) is fixedly connected to the outer cylindrical surface of the second floating block (18); the end surface of one side of the second floating block (18) is fixedly mounted with the slide column (19); the end surface of the other side of the second floating block (18) is fixedly mounted with the third magnet (16); the pointer (17) is fixedly connected to the upper end of the crank (15) on the same side as the third magnet (16); the limit plate (13) is provided with an arc-shaped long hole, and the two ends of the arc-shaped long hole are for memory. The memory device (14) has two limit limit ends for swinging; the slide column (19) on the memory device (14) is placed in the arc-shaped long hole; the limit position of the slide column (19) on the memory device (14) swinging in the clockwise direction is located on the left side of the vertical center axis of the second shaft (12); the velocity plate (3) rotates counterclockwise to a set angle, and the set protrusion on it hits the memory device (14) and rotates counterclockwise, and the vertical center line of the second floating block (18) on the memory device (14) passes through the vertical center axis of the second shaft (12) and reaches the right side of the vertical center axis of the second shaft (12).
3. A gas relay according to claim 1, characterized in that: There are a plurality of guide rods (7), the axes of which are parallel to each other and fixed at set positions in the cavity of the shell (1), and a plurality of matching guide holes are provided on the correspondingly connected first floating blocks (9).
4. A gas relay according to claim 1, characterized in that: There are a plurality of second reed switches (8), and when the second magnet (10) moves downward to a set position, the contacts in the plurality of second reed switches (8) are actuated; and when the second magnet (10) moves upward to a set position, the contacts in the plurality of second reed switches (8) return to their original state.
5. A gas relay according to claim 1, characterized in that: There are a plurality of first reed switches (4), and when the first magnet (2) moves rightward to a set position, the contacts in the plurality of first reed switches (4) are actuated; and when the first magnet (2) moves leftward to a set position, the contacts in the plurality of first reed switches (4) return to their original state.