Device for preventing gas protection maloperation of transformer

Abstract

The utility model discloses a device for preventing transformer gas protection maloperation, which belongs to the technical field of transformer gas protection and comprises a gas relay deflation valve, a signal converter, a wire connector and a high-voltage switch cabinet. A first output terminal of the signal converter is electrically connected with a light gas protection end of the high-voltage switch cabinet, and a second output terminal and a third output terminal of the signal converter are electrically connected with an input end of the wire connector. A fourth output terminal of the signal converter is electrically connected with a heavy gas protection end of the high-voltage switch cabinet; and an output end of the wire connector is electrically connected with a power supply of the high-voltage switch cabinet. According to the utility model, the tripping phenomenon of the transformer caused by gas protection maloperation in the deflation operation process of the gas relay of the transformer can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of transformer gas protection technology, specifically to a device for preventing transformer gas protection from malfunctioning. Background Technology

[0002] A gas relay (also known as a gas protection relay) is a protective device used in transformers, primarily in power systems, to monitor internal transformer faults. The gas relay is installed in the pipeline between the transformer's oil conservator and tank, and operates based on the gas or oil flow surge generated by an internal transformer fault. When a fault occurs inside the transformer, such as gas generated by oil decomposition or oil flow surge, it pushes the components inside the gas relay, triggering the relay contacts to actuate, sending an alarm signal (light gas) or activating protective components to automatically disconnect the transformer (heavy gas). The gas sources in the gas relay mainly include gases generated by transformer oil decomposition due to internal transformer faults and residual gases not completely vented after transformer maintenance. If too much gas accumulates inside the gas relay, it may cause the gas protection to trip, affecting normal operation; therefore, the gas relay needs to be vented. Currently, venting is mainly done manually on-site. To avoid the heavy gas protection malfunctioning and causing the transformer to trip during venting, the corresponding protection pressure plate generally needs to be disconnected before the venting operation. However, in actual operation, due to various reasons such as the operator's lack of professional skills or weak sense of responsibility, accidents such as the failure to disconnect the protection pressure plate before the gas release operation, resulting in the transformer's heavy gas protection tripping, occur from time to time. Utility Model Content

[0003] The main purpose of this utility model is to solve the above-mentioned technical problems to a certain extent, and to propose a device to prevent transformer gas protection from tripping erroneously. This device can effectively avoid the phenomenon of transformer tripping caused by gas protection erroneously tripping during the gas relay venting operation.

[0004] The above-mentioned problems to be solved by this utility model are achieved through the following technical solution:

[0005] A device for preventing transformer gas protection from malfunctioning is proposed, comprising a gas relay vent valve, a signal converter, a connector, and a high-voltage switchgear. The gas relay vent valve includes a valve body, a vent valve adjusting rod, and a piezoelectric sensor. The valve body has an outlet that communicates with the outside and inside. The vent valve adjusting rod is movably mounted on the valve body and switches the outlet between open and closed states as the adjusting rod moves on the valve body. The piezoelectric sensor is sleeved on the vent valve adjusting rod to sense the pressure exerted on the adjusting rod when it moves.

[0006] The piezoelectric sensor is electrically connected to the input terminal of the signal converter, the first output terminal of the signal converter is electrically connected to the light gas protection terminal of the high-voltage switchgear, the second and third output terminals of the signal converter are respectively electrically connected to the input terminal of the connector, the fourth output terminal of the signal converter is electrically connected to the heavy gas protection terminal of the high-voltage switchgear, and the output terminal of the connector is electrically connected to the power supply of the high-voltage switchgear.

[0007] In some embodiments, the input terminals of the connector include a light gas protection contact terminal and a heavy gas protection contact terminal, the second output terminal of the signal converter is electrically connected to the light gas protection contact terminal, and the third output terminal of the signal converter is electrically connected to the heavy gas protection contact terminal.

[0008] In some embodiments, the output terminal of the connector includes a light gas protection contact terminal and a heavy gas protection contact terminal, which are electrically connected to the second power supply and the first power supply of the high-voltage switchgear, respectively.

[0009] In some embodiments, the vent valve adjusting rod is movably connected to the valve body via a threaded assembly, wherein the vent valve adjusting rod is in a closed state when tightened, and in a closed state when loosened.

[0010] In some embodiments, the air outlet is located at the lower end of the valve body.

[0011] In some embodiments, the area of ​​the piezoelectric sensor is larger than the contact area with the vent valve adjusting rod.

[0012] The technical solution provided in this application has the following advantages compared with the prior art:

[0013] This utility model allows the vent to switch between open and closed states as the vent valve adjusting rod moves on the valve body. When the operator performs a venting operation on the gas relay, the vent valve bolt must be loosened first. At this time, the signal conversion device outputs a low level (dry contact disconnected), and the secondary circuits of the light gas protection terminal and the heavy gas protection terminal of the high-voltage switchgear are disconnected. If the operator forgets to disconnect the protection pressure plate, even if the light gas protection and heavy gas protection contacts of the gas relay are closed, it will not cause the transformer gas protection to trip erroneously. This effectively avoids the phenomenon of transformer tripping due to erroneous gas protection during the venting operation of the transformer gas relay. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the device for preventing transformer gas protection from malfunctioning according to this utility model;

[0016] Figure 2 This is a schematic diagram of the gas relay vent valve of this utility model in the tightened state;

[0017] Figure 3 This is a schematic diagram of the gas relay vent valve of this utility model in the open state.

[0018] Explanation of icon numbers:

[0019] 1-Gas relay vent valve; 101-Valve body; 102-Vent valve adjusting rod; 103-Piezoelectric sensor; 104-Gas outlet; 2-Signal converter; 201-Input terminal; 202-First output terminal; 203-Second output terminal; 204-Third output terminal; 205-Fourth output terminal; 3-Connector; 301-Heavy gas protection contact terminal input terminal; 302-Light gas protection contact terminal input terminal; 303-Heavy gas protection contact terminal output terminal; 304-Light gas protection contact terminal output terminal; 4-High voltage switchgear; 401-Light gas protection terminal; 402-Heavy gas protection terminal; 403-First power supply; 404-Second power supply. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] like Figure 1-3 As shown, this utility model proposes a device to prevent transformer gas protection from malfunctioning, including a gas relay vent valve 1, a signal converter 2, a connector 3, and a high-voltage switchgear 4. The gas relay vent valve 1 includes a valve body 101, a vent valve adjusting rod 102, and a piezoelectric sensor 103. The valve body 101 has an outlet 104 connected to the outside and inside. The vent valve adjusting rod 102 is movably disposed on the valve body 101, and the outlet 104 switches between open and closed states as the vent valve adjusting rod 102 moves on the valve body 101. The piezoelectric sensor 103 is sleeved on the vent valve adjusting rod 102 to sense the pressure on the vent valve adjusting rod 102 when it moves. The area of ​​the piezoelectric sensor 103 is larger than the contact area with the vent valve adjusting rod 102, thereby ensuring the contact area between the vent valve adjusting rod 102 and the piezoelectric sensor 103 when the vent valve adjusting rod moves.

[0024] The piezoelectric sensor 103 outputs a voltage signal. The piezoelectric sensor 103 is electrically connected to the input terminal 201 of the signal converter 2. The output terminals of the signal converter 2 include a first output terminal 202, a second output terminal 203, a third output terminal 204, and a fourth output terminal 205, all of which are dry contacts. The input terminals of the connector 3 include a heavy gas protection contact terminal 301 and a light gas protection contact terminal 302. The first output terminal 202 of the signal converter 2 is electrically connected to the light gas protection terminal 401 of the high-voltage switchgear 4, and the second output terminal 203 of the signal converter 2 is electrically connected to the light gas protection contact terminal 405. The input terminal 302 is electrically connected for sending a signal for light gas protection. The third output terminal 204 of the signal converter 2 is electrically connected to the input terminal 301 of the heavy gas protection contact terminal. The fourth output terminal 205 of the signal converter 2 is electrically connected to the heavy gas protection terminal 402 of the high-voltage switchgear 4 for tripping under heavy gas protection. The output terminals of the connector 3 include the heavy gas protection contact terminal output terminal 303 and the light gas protection contact terminal output terminal 304. The heavy gas protection contact terminal output terminal 303 and the light gas protection contact terminal output terminal 304 are electrically connected to the first power supply 403 and the second power supply 404 of the high-voltage switchgear 4, respectively.

[0025] like Figure 2 As shown, during normal operation of the transformer, the vent valve regulating rod 102 is in a tightened state. The piezoelectric sensor 103 below the vent valve regulating rod 102 generates charge under pressure. This charge is converted into a voltage signal. The voltage signal is output as a dry contact signal by the signal converter 2. The dry contact is connected in series to the secondary circuit of the light gas protection terminal 401 and the heavy gas protection terminal 402 of the high-voltage switchgear 4. When the vent valve regulating rod 102 is fully tightened, the piezoelectric sensor 103 is subjected to external force. At this time, the output voltage signal exceeds the threshold, and the signal converter 2 outputs a high level (dry contact closes). If the light gas protection terminal 401 and the heavy gas protection terminal 402 of the high-voltage switchgear 4 are closed at this time, the secondary circuit can be connected to ensure the normal operation of the gas protection.

[0026] In this embodiment, the movement of the vent valve adjusting rod 102 on the valve body 101 switches the vent port 104 between open and closed states. Figure 3As shown, when the operator performs the gas release operation on the gas relay, the gas release valve bolt must be loosened first. At this time, the signal conversion device outputs a low level (dry contact is open), and the secondary circuits of the light gas protection terminal 401 and the heavy gas protection terminal 402 of the high-voltage switchgear 4 form a break. If the operator forgets to disconnect the protection pressure plate, even if the light gas protection and heavy gas protection contacts of the gas relay are closed, it will not cause the transformer gas protection to trip erroneously. This can effectively avoid the phenomenon of transformer tripping due to gas protection erroneous tripping during the gas release operation of the transformer gas relay.

[0027] For example, the vent valve adjusting rod 102 is movably connected to the valve body 101 by a threaded assembly. By turning the vent valve adjusting rod 102, it can move up and down on the valve body 101 and open or close the vent port 104. The vent port 104 is located at the lower end of the valve body 101 so that the vent valve adjusting rod 102 can adjust the opening or closing of the vent port 104 within a small stroke range. When the vent valve adjusting rod 102 is tightened, the vent port 104 is in a closed state, and when the vent valve adjusting rod 102 is loosened, the vent port 104 is in an open state.

[0028] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A device for preventing mal-operation of transformer gas protection, characterized in that, The gas relay exhaust valve, the signal converter, the connector and the high-voltage switch cabinet, the gas relay exhaust valve comprises a valve body, an exhaust valve adjusting rod and a piezoelectric sensor, the valve body is communicated with the inside and the outside and is provided with an air outlet, the exhaust valve adjusting rod is movably arranged in the valve body, and the air outlet is switched between the open and closed states with the movement of the exhaust valve adjusting rod on the valve body, and the piezoelectric sensor is sleeved on the exhaust valve adjusting rod and is used for sensing the pressure received when the exhaust valve adjusting rod moves. The piezoelectric sensor is electrically connected with the input terminal of the signal converter, the first output terminal of the signal converter is electrically connected with the light gas protection end of the high-voltage switch cabinet, the second output terminal and the third output terminal of the signal converter are respectively electrically connected with the input end of the connector, the fourth output terminal of the signal converter is electrically connected with the heavy gas protection end of the high-voltage switch cabinet, and the output end of the connector is electrically connected with the power supply of the high-voltage switch cabinet.

2. The device for preventing mal-operation of transformer gas protection according to claim 1, characterized in that, The input end of the connector comprises a light gas protection contact terminal post input terminal and a heavy gas protection contact terminal post input terminal, the second output terminal of the signal converter is electrically connected with the light gas protection contact terminal post input terminal, and the third output terminal of the signal converter is electrically connected with the heavy gas protection contact terminal post input terminal.

3. The device for preventing mal-operation of transformer gas protection according to claim 1, characterized in that, The output end of the connector comprises a light gas protection contact terminal post output terminal and a heavy gas protection contact terminal post output terminal, and the light gas protection contact terminal post output terminal and the heavy gas protection contact terminal post output terminal are respectively electrically connected with the second power supply and the first power supply of the high-voltage switch cabinet.

4. The device for preventing mal-operation of transformer gas protection according to claim 1, characterized in that, The exhaust valve adjusting rod is movably connected with the valve body in a threaded assembly mode, wherein the air outlet is in the closed state when the exhaust valve adjusting rod is tightened, and the air outlet is in the open state when the exhaust valve adjusting rod is loosened.

5. The device for preventing mal-operation of transformer gas protection according to claim 1, characterized in that, The air outlet is arranged at the lower end of the valve body.

6. The device for preventing mal-operation of transformer gas protection according to claim 1, characterized in that, The area of the piezoelectric sensor is greater than the contact area of the exhaust valve adjusting rod.

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