A device with gas protection and flow interruption function

Abstract

The present application relates to a kind of device with gas protection and flow interruption function, including shell, gas protection assembly is provided in shell, flow interruption assembly, flow interruption assembly includes valve plate, flow interruption reed, flow interruption reed is set in the bottom of shell, the upper end of valve plate is connected in the inner wall of shell, the lower end of valve plate is suspended and is equipped with flow interruption magnet, when transformer normal operation, valve plate and left sealing surface form an open angle, and keep stable open state, when transformer failure, there is oil flow and flow reaches minimum cut-off flow, valve plate is automatically closed and triggers the flow interruption reed.The present application combines gas relay and flow interruption valve two in one, with gas protection and flow interruption function simultaneously, save cost, reduce the trouble of later maintenance.

Description

Technical Field

[0001] This invention relates to the field of transformer non-electrical protection technology, specifically to a device with gas protection and current interruption functions. Background Technology

[0002] When a minor inter-turn short circuit, discharge, or single-phase grounding occurs inside a transformer, it causes the transformer oil and other materials to decompose, generating gas that can then cause oil spray to impact the gas relay. A protective device that utilizes this characteristic and reflects changes in gas is called gas protection. Gas protection is the primary protection for transformers and is divided into three types: light gas protection, heavy gas protection, and oil loss (low oil level) protection.

[0003] When a transformer encounters an insulation fault or other fault, causing a rapid rise in transformer oil temperature and threatening explosion or fire, the control system, upon receiving critical signals such as electrical fault signals, temperature detection signals, and heavy gas signals, immediately activates the oil draining mechanism—draining oil and relieving pressure—and subsequently initiates the nitrogen injection system. The shut-off valve automatically cuts off the oil flow between the oil conservator and the tank during rapid emergency oil draining in the event of a transformer accident, tank rupture, and large-scale transformer oil spillage, preventing oil leakage from the conservator from contributing to combustion.

[0004] Therefore, to ensure the normal operation of transformers, the gas relay and the shut-off valve provide indispensable gas protection and shut-off functions. Gas relays and shut-off valves are typically installed on the connecting pipes between the transformer and the oil conservator. When a transformer malfunctions, workers determine the type of fault by observing the operation of the gas relay and shut-off valve and the alarm signals they emit. They also check whether the gas relay is operating correctly and reset the shut-off valve's status handle. Because the gas relay and shut-off valve are two separate devices operating independently, maintenance work is very complex and cumbersome. The separate operation of the shut-off valve and gas relay on existing transformers increases costs and reduces the efficiency of transformer maintenance at power plant sites. Summary of the Invention

[0005] The purpose of this invention is to provide a device with gas protection and interruption functions to solve the problems of separate operation of gas relays and interruption valves on existing transformers, high cost, and troublesome maintenance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The utility model provides a device with gas protection and cut-off function, including the casing, be equipped with gas protection subassembly in the casing, the outside of casing is equipped with terminal box, gas protection subassembly is connected with corresponding terminal in terminal box through signal line, still be equipped with cut-off subassembly in the casing, cut-off subassembly includes valve plate, cut-off dry reed, cut-off dry reed sets up at the bottom of casing, the upper end of valve plate is connected in the inner wall of casing, the lower end of valve plate is suspended and is equipped with cut-off magnet, when transformer normal operation, valve plate forms an open angle with left side sealing surface, and keep stable open state, when transformer failure, oil flow leaks and reaches minimum cut-off flow, valve plate is automatically closed and triggers cut-off dry reed.

[0008] Further, the gas protection subassembly includes a light gas module, the light gas module includes a light gas float and a light gas float limiting member, the light gas float limiting member is arranged on the float holder and is used for limiting the upward and downward movement of the light gas float.

[0009] Further, the gas protection subassembly includes an oil loss module, the oil loss module includes an oil loss float and an oil loss float limiting member, the oil loss float limiting member is arranged on the float holder and is used for limiting the upward and downward movement of the oil loss float, and the oil loss float is located below the light gas float.

[0010] Further, the light gas float and the oil loss float are sleeved on the float holder, when the light gas float moves to the lower light gas float limiting member, the light gas dry reed is triggered, and when the oil loss float moves to the lower oil loss float limiting member, the oil loss dry reed is triggered.

[0011] Further, the gas protection subassembly includes a heavy gas module, the heavy gas module includes a baffle, a heavy gas magnet and a heavy gas dry reed, the upper portion of the baffle is connected with the inner wall of the casing, and the lower portion of the baffle is provided with the heavy gas magnet, when a heavy gas accident occurs, the baffle swings from left to right so that the heavy gas magnet triggers the heavy gas dry reed.

[0012] Further, a spring is arranged between the baffle and the casing, when a heavy gas accident occurs, the baffle overcomes the tension of the spring under the impact force.

[0013] Further, a handle is arranged on the outer side of the casing, the handle is connected with the hinge shaft where the valve plate is arranged, and is used for manually adjusting the state of the valve plate.

[0014] Further, a glass window is arranged on one side of the casing.

[0015] Further, a scale is arranged on the glass window.

[0016] The beneficial effects of the present application are as follows:

[0017] The present application combines the gas relay and the cut-off valve into one, and has both gas protection and cut-off functions, saves cost, reduces the trouble of later maintenance, and improves the efficiency of maintenance work.

[0018] Meanwhile, it has light gas protection, heavy gas protection, oil loss protection and cut-off function, is diversified in function, and is independently operated without affecting each other.

[0019] The shell is provided with a glass window, and the window is marked with a scale for easy observation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the front view of the device with gas protection and cut-off function of the present application;

[0021] Fig. 2 is the rear view of the device with gas protection and cut-off function of the present application;

[0022] Fig. 3 is the cross-sectional view of the device with gas protection and cut-off function of the present application.

[0023] Corresponding names of each mark in the figure:

[0024] 1, junction box; 2, glass window; 3, handle; 4, shell; 5, valve plate; 6, baffle; 7, baffle support; 8, spring; 9, cut-off reed; 10, heavy gas magnet; 11, heavy gas reed; 12, cut-off magnet; 13, terminal; 14, light gas float; 15, light gas float limiting piece; 16, float bracket; 17, oil loss float; 18, oil loss float limiting piece. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0026] Embodiment:

[0027] As shown in the drawings, Figs. 1-3 A device with gas protection and cut-off function includes a shell 4, a gas protection assembly and a cut-off assembly are arranged in the shell 4, the gas protection assembly includes a light gas module, an oil loss module and a heavy gas module, the present application can realize gas protection and cut-off protection, and the specific structure will be described below.

[0028] The outer side of the shell 4 is provided with a junction box 1, a plurality of terminals are arranged in the junction box 1 for the wiring of signal lines, and the internal sensing components are connected with the external alarm components and control components, when the corresponding reed switch is triggered to close, the circuit is connected, and the alarm is realized. The gas protection assembly and the cut-off assembly are connected with the corresponding terminals in the junction box 1 through signal lines.

[0029] The casing 4 is connected with oil line pipes at both ends through flanges, one side of which is connected with a transformer and the other side is connected with an oil storage tank.

[0030] In this embodiment, in order to distinguish the light gas, heavy gas, oil loss and flow interruption modules and facilitate understanding, the components with the same function are modified and limited, such as the light gas float 14, the oil loss float 17, the light gas reed tube, the heavy gas reed tube 11 and the like.

[0031] The light gas module comprises the light gas float 14 and a light gas float limiting piece 15, the light gas float limiting piece 15 is arranged on the float bracket 16 and is used for limiting the upward and downward movement of the light gas float 14, that is, the light gas float floats up and down between the two limiting pieces.

[0032] The oil loss module comprises the oil loss float 17 and an oil loss float limiting piece 18, the oil loss float limiting piece 18 is arranged on the float bracket 16 and is used for limiting the upward and downward movement of the oil loss float 17, that is, the light gas float floats up and down between the two limiting pieces. The oil loss float is located below the light gas float.

[0033] The light gas float 14 and the oil loss float 17 are sleeved on the float bracket 16 and float up and down with the change of the oil level; a double-float structure is adopted, which is simple in structure; in the prior art, an independent float ball structure is adopted. When the light gas float moves to the lower light gas float limiting piece 15, the light gas reed tube is triggered; when the oil loss float moves to the lower oil loss float limiting piece 18, the oil loss reed tube is triggered. The light gas reed tube and the oil loss reed tube can be arranged in the float bracket 16.

[0034] The gas protection assembly further comprises a heavy gas module, the heavy gas module comprises a baffle 6, a heavy gas magnet 10 and a heavy gas reed tube 11, the upper part of the baffle 6 is connected with the inner wall of the casing 4 and is installed through a baffle support 7, the lower part of the baffle 6 is provided with the heavy gas magnet 10, a spring 8 is further arranged between the baffle 6 and the casing 4, one end of the spring 8 is fixed on the baffle support 7, and in a normal state, the baffle 6 is in an inclined right state. When a heavy gas accident occurs, the baffle can overcome the tension of the spring 8 by the impact force, the baffle 6 swings from left to right so that the heavy gas magnet 10 triggers the heavy gas reed tube 11.

[0035] The flow interruption assembly comprises a valve plate 5 and a flow interruption reed tube 9, the flow interruption reed tube 9 is arranged at the bottom of the casing 4. The upper end of the valve plate 5 is connected with the inner wall of the casing 4, the lower end of the valve plate 5 is suspended and provided with a flow interruption magnet 12. When the transformer operates normally, the valve plate 5 and the left sealing surface form an open included angle and remain in a stable open state, when the transformer fails, oil leaks and the flow reaches the minimum closing flow, the valve plate 5 is automatically closed and triggers the flow interruption reed tube 9 (the oil flow direction isFig. 3 The handle 3 is connected with the hinge shaft where the valve plate 5 is located, and is used for manually adjusting the state of the valve plate 5.

[0036] The connection mode of the upper end of the valve plate 5 is the prior art, and the prior art independently arranged shutoff valve also has the valve plate 5 and the handle 3, and is used during oil injection and oil discharge, so that a specific structure diagram is not given, and the valve plate 5 can be simply understood as follows: the upper end of the valve plate 5 is hingedly connected, and a torsional spring is arranged at the hinge connection position, so that the valve plate 5 can be maintained in a certain state, and the valve plate 5 can be rotated under force.

[0037] The housing 4 is further provided with a transparent glass window 2, and the glass window 2 is marked with a scale, so that the internal oil flow condition and the volume value of the light gas can be observed and estimated. The glass window 2 is located on the opposite side of the housing 4 where the handle 3 is arranged.

[0038] The above arrangement can realize the following functions.

[0039] Light gas protection:

[0040] When the internal fault of the transformer oil tank is relatively slight or in the initial stage, the oil in the oil tank is decomposed and vaporized, a small amount of gas is accumulated at the top of the device, the oil level is lowered, the light gas float 14 is lowered to the light gas float limiting piece 15, the light gas reed tube is triggered, a closed loop is formed, and a light gas alarm signal is transmitted.

[0041] Oil loss protection:

[0042] When the transformer has a serious oil leakage, the oil level in the device begins to drop, the light gas float 14 triggers the light gas reed tube, and an alarm signal is sent. When the transformer oil continues to flow, the oil in the oil storage tank, the oil pipeline and the device is emptied, the oil loss float 17 sinks to the lower oil loss float limiting piece 18, triggers the oil loss reed tube, forms a closed loop, and the device starts oil loss protection, cuts off the power supply connected to the transformer (trips).

[0043] Heavy gas protection:

[0044] Specifically, when the internal fault of the transformer oil tank is serious, the oil in the oil tank is decomposed and vaporized, a large amount of gas is generated, the pressure in the oil tank is rapidly increased, the gas and oil flow rapidly to the oil storage tank (from the left side of the device to the right side), and the gas and oil flow impact the baffle. When the flow rate reaches the setting value of the heavy gas, the baffle 6 drives the heavy gas magnet 10 to displace the heavy gas reed tube 11, forms a closed loop, sends a heavy gas tripping action, cuts off the power supply connected to the transformer (trips), and thus realizes the function of heavy gas protection. Fig. 3

[0045] Shutoff function: ​

[0046] When the transformer is in normal operation, the handle 3 is in the running state position, when the transformer fails, the oil flow leaks, and the flow reaches the minimum off flow, the valve plate 5 is automatically closed under the pressure difference generated by the rapid passage of the oil flow, the flow breaking magnet 12 at the bottom of the valve plate 5 triggers the flow breaking reed 9 below, forming a closed loop, at this time, the closed loop connects the alarm signal loop through the wiring terminal 13 in the wiring box 1, and the oil tank no longer supplies oil to the transformer tank. After the transformer is removed, the transformer oil stops leaking, and the device can be reset by the handle 3, that is, by rotating the handle 3 to drive the valve plate 5 to rotate in the opposite direction by a certain angle.

[0047] The present application is not limited to the above-mentioned best mode, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution with the same or similar to the present application falls within the scope of the present application.

Claims

1. A device with gas protection and interruption functions, comprising a housing, a gas protection component disposed within the housing, and a junction box disposed outside the housing, wherein the gas protection component is connected to a corresponding terminal in the junction box via a signal line, characterized in that: The housing is also equipped with a flow interruption assembly, which includes a valve plate and a flow interruption reed switch. The flow interruption reed switch is located at the bottom of the housing. The upper end of the valve plate is connected to the inner wall of the housing, and the lower end of the valve plate is suspended and equipped with a flow interruption magnet. When the transformer is running normally, the valve plate forms an open angle with the left sealing surface and remains in a stable open state. When the transformer malfunctions and oil leaks out and the flow reaches the minimum shut-off flow, the valve plate automatically closes and triggers the flow interruption reed switch.

2. The device with gas protection and flow interruption functions according to claim 1, characterized in that: The gas protection component includes a light gas module, which includes a light gas float and a light gas float limiter. The light gas float limiter is mounted on the float frame and is used to limit the upward and downward movement of the light gas float.

3. The device with gas protection and flow interruption functions according to claim 2, characterized in that: The gas protection component includes an oil loss module, which includes an oil loss float and an oil loss float limiting component. The oil loss float limiting component is mounted on the float frame and is used to limit the upward and downward movement of the oil loss float. The oil loss float is located below the light gas float.

4. The device with gas protection and flow interruption functions according to claim 3, characterized in that: Both the light gas float and the oil loss float are mounted on the float frame. When the light gas float moves to the lower light gas float limiter, it triggers the light gas reed switch; when the oil loss float moves to the lower oil loss float limiter, it triggers the oil loss reed switch.

5. The device with gas protection and flow interruption functions according to claim 1, characterized in that: The gas protection component includes a heavy gas module, which includes a baffle, a heavy gas magnet, and a heavy gas reed switch. The upper part of the baffle is connected to the inner wall of the housing, and the lower part of the baffle is provided with the heavy gas magnet. When a heavy gas accident occurs, the baffle swings from left to right, causing the heavy gas magnet to trigger the heavy gas reed switch.

6. The device with gas protection and flow interruption functions according to claim 5, characterized in that: A spring is also provided between the baffle and the housing. In the event of a heavy gas accident, the impact force on the baffle overcomes the tension of the spring.

7. The device with gas protection and flow interruption functions according to claim 1, characterized in that: A handle is provided on the outside of the housing, and the handle is connected to the hinge shaft where the valve plate is located, for manually adjusting the state of the valve plate.

8. The device with gas protection and flow interruption functions according to any one of claims 1 to 7, characterized in that: A glass window is provided on one side of the casing.

9. The device with gas protection and flow interruption functions according to claim 8, characterized in that: The glass window has markings.

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