Digital gas relay

Abstract

The utility model discloses a digital gas relay, comprising a gas relay body, a linear displacement sensor and a terminal display electrically connected with the linear displacement sensor, the gas relay body is rotatably provided with a baffle plate through a rotating shaft, the baffle plate is provided with an upper hinge, and the upper hinge is provided with a lower hinge. One end, far away from the baffle plate, of the upper hinge is connected with one end of a connecting rod; the linear displacement sensor comprises a sleeve fixedly connected with the gas relay body, a pull rod is arranged in the sleeve in a sliding mode, and one end, located outside the sleeve, of the pull rod is connected with the other end of the connecting rod through a lower hinge. The digital gas relay provided by the utility model can monitor the rotation angle of the baffle plate in the gas relay in real time, can avoid heavy gas misoperation caused by damp of the wiring terminal of the gas relay, and greatly improves the accuracy of heavy gas alarm of the gas relay.

Description

Technical Field

[0001] The utility model relates to the technical field of gas relays, in particular to a digital gas relay. Background Technique

[0002] A gas relay is a kind of relay protection device used in oil-immersed transformers and on-load tap-changers, and is installed on the pipeline between the transformer oil tank and the conservator.

[0003] When a fault occurs inside the transformer and causes oil flow surging, the rapidly surging oil flow surges from the transformer oil tank to the conservator, impacting the gas relay installed on the pipeline. When the baffle of the gas relay rotates under the impact of the transient surging oil flow and touches the reed switch behind the baffle, the relay protection circuit is connected, and a heavy gas alarm signal is issued.

[0004] As an important non-electrical quantity protection device in the transformer, accidents of the main transformer tripping caused by misoperation of the heavy gas occur from time to time, seriously affecting the stable operation of the transformer.

[0005] At present, the heavy gas alarm of the traditional gas relay occurs when the reed switch conducts to form a closed loop, which is a switch quantity of (0, 1), and cannot judge the operating state and fault development process of the transformer before the heavy gas fault occurs. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a digital gas relay, which converts the switch quantity of the heavy gas alarm of the gas relay into a continuous quantity to solve the technical problems mentioned in the above background technique.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A digital gas relay of the utility model includes a gas relay body, a linear displacement sensor, and a terminal display electrically connected to the linear displacement sensor. A baffle is rotatably arranged on the gas relay body through a rotating shaft, an upper hinge is arranged on the baffle, and one end of the upper hinge far away from the baffle is connected to one end of a connecting rod; the linear displacement sensor includes a sleeve fixedly connected to the gas relay body, a pull rod is slidably arranged in the sleeve, and one end of the pull rod located outside the sleeve is connected to the other end of the connecting rod through a lower hinge.

[0009] Further, the model of the linear displacement sensor is MIRAN Milang KTM-150mm / a70, and the measuring range is 150mm.

[0010] Further, the outside of the sleeve of the linear displacement sensor is fixedly connected to one end of an L-shaped fixing bracket, and the other end of the fixing bracket is fixedly connected to the frame of the gas relay body.

[0011] Further, the linear displacement sensor is electrically connected to the terminal display through a signal transmission line.

[0012] Further, the gas relay body is provided with a wiring terminal for connecting the signal transmission line and the terminal display.

[0013] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0014] A digital gas relay provided by the present utility model can monitor the rotation angle of the baffle inside the gas relay in real time, can avoid the misoperation of the heavy gas caused by the dampness of the wiring terminal of the gas relay, and greatly improves the accuracy rate of the heavy gas alarm of the gas relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be further described below in conjunction with the drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the digital gas relay of the present utility model when the baffle does not act;

[0017] Figure 2 It is a schematic diagram of the overall structure of the digital gas relay of the present utility model when the baffle acts;

[0018] Figure 3 It is a schematic diagram of the structure of the terminal display of the present utility model;

[0019] Figure 4 It is a partially enlarged schematic diagram of the present utility model;

[0020] Explanation of reference numerals: 1, upper hinge; 2, connecting rod; 3, lower hinge; 4, pull rod; 5, sleeve; 6, fixing bracket; 7, baffle; 8, signal transmission line; 9, wiring terminal; 10, frame; 11, linear displacement sensor; 12, terminal display. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figure 1 shown, a digital gas relay includes a gas relay body, a linear displacement sensor 11, and a terminal display 12 electrically connected to the linear displacement sensor 11.

[0022] A baffle 7 is rotatably installed on the gas relay body through a rotating shaft. An upper hinge 1 is installed at the upper end of the baffle 7. One end of the upper hinge 1 away from the baffle 7 is connected to one end of a connecting rod 2. The linear displacement sensor 11 includes a sleeve 5 fixedly connected to the gas relay body. Specifically, the outside of the sleeve 5 of the linear displacement sensor 11 is fixedly connected to one end of an L-shaped fixing frame 6, and the other end of the fixing frame 6 is fixedly connected to the frame 10 of the gas relay body. The fixing frame 6 can ensure that the linear displacement sensor remains stable during operation and avoid displacement measurement errors caused by vibration or other factors.

[0023] A pull rod 4 is slidably installed in the sleeve 5. One end of the pull rod 4 located outside the sleeve 5 is connected to the other end of the connecting rod 2 through a lower hinge 3.

[0024] In this embodiment, the model of the linear displacement sensor 11 is MIRAN Milang KTM-150mm / a70, and the measuring range is 150mm, which can meet the measurement requirements for the rotation of the baffle 7.

[0025] The linear displacement sensor 11 is electrically connected to the terminal display 12 through a signal transmission line 8. The sleeve 5 is the main body of the linear displacement sensor 11, and the pull rod 4 serves as a measuring mechanism and can slide in the sleeve 5; the signal transmission line 8 is the signal transmission part of the linear displacement sensor. The linear displacement sensor can monitor the displacement data of the pull rod 4 in the sleeve 5 and transmit the data outward through the data transmission line 8 to ensure the accuracy and real-time of the data.

[0026] A wiring terminal 9 for connecting the signal transmission line 8 and the terminal display 12 is installed on the gas relay body. The wiring terminal 9 has two more lines arranged compared to other wiring terminals. One line is connected to the signal transmission line 8 and can receive the displacement data of the baffle 7 measured by the linear displacement sensor, and the other line is connected to the terminal display 12 and is responsible for transmitting the baffle displacement data to the terminal display.

[0027] The terminal display 12 has a pre-written algorithm and program built in, which can convert the received displacement data of the baffle 7 into baffle rotation angle data and display it. The integration of this algorithm program enables the operator to intuitively understand the rotation angle information of the gas relay baffle and facilitates monitoring.

[0028] The gas relay should be installed on the connecting pipeline between the oil-immersed transformer oil tank and the conservator. The inner diameter of the connecting pipe should be the same as the pipeline diameter of the relay, and the arrow on the relay must point to the conservator.

[0029] Before the specific application of this utility model, multiple experiments should be conducted to record the baffle rotation angle when the heavy gas of the gas relay operates. Based on the experimental data, the setting value of the baffle rotation angle when the heavy gas of the gas relay operates can be obtained.

[0030] When this utility model is specifically applied, turn on the terminal display. When the heavy gas of the gas relay operates, observe whether the baffle rotation angle reaches the setting value. When the heavy gas of the gas relay operates but the baffle rotation angle does not reach the setting value, it may be a malfunction caused by the moisture absorption of the wiring terminal of the gas relay. Only when the baffle rotation angle reaches the setting value can it be shown that the heavy gas of the gas relay has operated, effectively avoiding the malfunction caused by the moisture absorption of the heavy gas signal wiring terminal of the gas relay and improving the accuracy of the gas relay alarm.

[0031] A digital gas relay provided by this utility model can monitor the baffle rotation angle inside the gas relay in real time, avoid the heavy gas malfunction caused by the moisture absorption of the wiring terminal of the gas relay, and greatly improve the accuracy of the heavy gas alarm of the gas relay.

[0032] The embodiments described above are only descriptions of the preferred embodiments of this utility model, and do not limit the scope of this utility model. Without departing from the design spirit of this utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of this utility model shall fall within the protection scope determined by the claims of this utility model.

Claims

1. A digital gas relay, characterized in that: It includes a gas relay body, a linear displacement sensor, and a terminal display electrically connected to the linear displacement sensor. A baffle is rotatably arranged on the gas relay body through a rotating shaft. An upper hinge is arranged on the baffle, and one end of the upper hinge away from the baffle is connected to one end of a connecting rod. The linear displacement sensor includes a sleeve fixedly connected to the gas relay body. A pull rod is slidably arranged in the sleeve, and one end of the pull rod outside the sleeve is connected to the other end of the connecting rod through a lower hinge.

2. The digital gas relay according to claim 1, wherein: The model of the linear displacement sensor is MIRAN Milang KTM-150mm / a70, with a measuring range of 150mm.

3. The digital gas relay according to claim 1, wherein: The outside of the sleeve of the linear displacement sensor is fixedly connected to one end of an L-shaped fixing frame, and the other end of the fixing frame is fixedly connected to the frame of the gas relay body.

4. The digital gas relay according to claim 1, wherein: The linear displacement sensor is electrically connected to the terminal display through a signal transmission line.

5. The digital gas relay according to claim 4, characterized in that: The gas relay body is provided with a wiring terminal for connecting the signal transmission line and the terminal display.

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