Transformer fire response device

Abstract

The utility model discloses a transformer fire response device. Comprising a linear temperature sensing cable unit arranged on a transformer, an OR logic gate unit used for receiving an action signal or a disconnection signal from the linear temperature sensing cable unit, and a circuit breaker unit connected with the transformer, the first AND logic gate is used for receiving a circuit breaking signal from the circuit breaker unit; the fire extinguishing equipment is connected with the output end of the first AND logic gate; and the output end of the logic gate unit is connected with the input end of the first AND logic gate. According to the utility model, under the condition that the line type temperature sensing cable unit is damaged and broken before sending an action signal, the logic gate unit can still identify a broken line signal and send a fire hazard feedback signal to the first AND logic gate, so that the integrity of a fire hazard alarm signal is ensured; the fire extinguishing equipment can receive the alarm in time and take corresponding fire extinguishing measures, fire spreading caused by signal loss is avoided, the reliability is high, and the safety is good.

Description

Technical Field

[0001] The utility model relates to a transformer, in particular to a transformer fire response device. Background Art

[0002] With the rapid development of social economy, the demand for electricity is constantly increasing, and the operation safety of grid accessory equipment, especially transformers, becomes particularly critical. As a core device in the power system, once a transformer fails, it may cause an electrical fire, seriously threatening the safety of power supply personnel and the stable operation of the power system.

[0003] At present, most large transformers in substations are equipped with dedicated fire-fighting equipment, such as foam spray fire extinguishing equipment, fine water mist fire extinguishing equipment, and water spray fire extinguishing equipment, etc., to cope with possible fire accidents. However, due to the relatively high proportion of outdoor transformers and the relatively small number of indoor transformers, traditional point-type temperature or smoke detectors are difficult to meet the fire detection requirements of outdoor transformers. To solve this problem, the currently commonly used fire detection device is a temperature-sensing cable. By evenly winding the linear temperature-sensing cable around the main transformer body and its oil conservator, the temperature changes around the main transformer and the oil conservator can be accurately monitored. When the detected temperature exceeds the preset safety threshold, the temperature-sensing cable will send a feedback signal to the main transformer fire control cabinet to trigger an alarm. However, relying solely on the signal of the temperature-sensing cable to judge whether to initiate fire-fighting measures, this single control mechanism has low reliability and there is a risk of false triggering, which may lead to adverse consequences. To reduce the possibility of false operation, many projects have added the condition of the circuit breaker tripping signal to the control logic. Only when the temperature-sensing cable detects abnormal temperature and the circuit breaker tripping signal are both satisfied, the fire-fighting equipment will be activated (for example, an oil-immersed transformer foam oil-draining fire extinguishing device disclosed in the Chinese patent document with the publication number: CN215136222U). Although this dual-signal control strategy improves the safety of the system to a certain extent, there are still limitations. For example, once the transformer bursts and the temperature-sensing cable breaks, the signal cannot be transmitted, making the fire-fighting equipment unable to be activated in time, thus causing serious consequences. In addition, some transformers with a longer operation life are prone to false signal situations due to the less rigorous detection control logic in the design, which not only increases the commissioning risk but also makes the subsequent maintenance more difficult and difficult to meet the new safety requirements. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a transformer fire response device with high reliability and good safety.

[0005] To solve the above technical problem, the utility model adopts the following technical solutions:

[0006] A transformer fire response device includes a linear temperature sensing cable unit disposed on the transformer, an OR logic gate unit for receiving an action signal or a disconnection signal from the linear temperature sensing cable unit, a circuit breaker unit connected to the transformer, a first AND logic gate for receiving a disconnection signal from the circuit breaker unit, and a fire extinguishing device connected to the output end of the first AND logic gate. The output end of the OR logic gate unit is connected to the input end of the first AND logic gate.

[0007] As a further improvement of the above technical solution: The linear temperature sensing cable unit includes a first linear temperature sensing cable and a second linear temperature sensing cable. The OR logic gate unit includes a first OR logic gate and a second OR logic gate. The first linear temperature sensing cable is connected to the input end of the first OR logic gate, and the second linear temperature sensing cable is connected to the input end of the second OR logic gate. The output ends of the first OR logic gate and the second OR logic gate are both connected to the input end of the first AND logic gate.

[0008] As a further improvement of the above technical solution: It further includes a special fire detector unit and a majority decision gate. The special fire detector unit, the output end of the first OR logic gate, and the output end of the second OR logic gate are all connected to the input end of the majority decision gate. The output end of the majority decision gate is connected to the input end of the first AND logic gate.

[0009] As a further improvement of the above technical solution: The special fire detector unit is arranged at intervals from the transformer.

[0010] As a further improvement of the above technical solution: The special fire detector unit includes a first special fire detector and a second special fire detector. Both the first special fire detector and the second special fire detector are connected to the input end of the majority decision gate.

[0011] As a further improvement of the above technical solution: The first special fire detector and the second special fire detector are infrared flame detectors or image-type fire detectors.

[0012] As a further improvement of the above technical solution: It further includes a manual fire alarm button connected to the input end of the OR logic gate unit.

[0013] As a further improvement of the above technical solution: The linear temperature sensing cable unit is a recoverable temperature sensing cable unit.

[0014] As a further improvement of the above technical solution: The linear temperature sensing cable unit is a non-recoverable temperature sensing cable unit and is equipped with a disconnection monitoring component.

[0015] As a further improvement of the above technical solution: The circuit breaker unit includes a second AND logic gate and three circuit breakers respectively connected to the high-voltage side, medium-voltage side, and low-voltage side of the transformer. Each of the circuit breakers is connected to the input terminal of the second AND logic gate, and the output terminal of the second AND logic gate is connected to the input terminal of the first AND logic gate.

[0016] Compared with the prior art, the advantages of the present utility model are as follows: The transformer fire feedback device disclosed by the present utility model combines the fire feedback signal sent by the OR logic gate unit and the open circuit feedback signal sent by the circuit breaker unit to respond to a fire. Specifically, after the OR logic gate unit receives the action signal or the disconnection signal from the linear temperature sensing cable unit, it will send a fire feedback signal to the first AND logic gate. Only when the first AND logic gate receives the fire feedback signal from the OR logic gate unit and the disconnection signal from the circuit breaker unit, will it transmit a fire alarm signal to the fire extinguishing equipment, thereby activating the fire extinguishing equipment to perform fire extinguishing work, effectively avoiding false alarms. Even in the case where the transformer explodes and the linear temperature sensing cable unit is damaged and disconnected before sending an action signal, the OR logic gate unit can still recognize the disconnection signal and send a fire feedback signal to the first AND logic gate, ensuring the integrity of the fire alarm signal, guaranteeing that the fire extinguishing equipment can receive the alarm in a timely manner and take corresponding fire extinguishing measures, avoiding the spread of the fire due to signal loss, with high reliability and good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the response process of the first embodiment of the transformer fire response device of the present utility model.

[0018] Figure 2 is a schematic diagram of the response process of the second embodiment of the transformer fire response device of the present utility model.

[0019] Figure 3 is a schematic diagram of the response process of the third embodiment of the transformer fire response device of the present utility model.

[0020] In the figure, each reference numeral represents: 1, linear temperature sensing cable unit; 11, first linear temperature sensing cable; 12, second linear temperature sensing cable; 2, OR logic gate unit; 21, first OR logic gate; 22, second OR logic gate; 3, circuit breaker unit; 4, first AND logic gate; 5, second AND logic gate; 6, fire extinguishing equipment; 7, special fire detector unit; 71, first special fire detector; 72, second special fire detector; 8, majority decision gate; 9, manual fire alarm button. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will further describe the present utility model in detail with reference to the accompanying drawings of the specification and specific embodiments.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0023] In the present utility model, unless otherwise clearly defined and limited, terms such as "assembly", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Embodiment 1

[0025] Figure 1 An embodiment of the transformer fire response device of the present utility model is shown. The transformer fire response device of this embodiment includes a linear temperature sensing cable unit 1 provided on the transformer, an OR logic gate unit 2 for receiving an action signal or a break signal from the linear temperature sensing cable unit 1, a circuit breaker unit 3 connected to the transformer, a first AND logic gate 4 for receiving a break signal from the circuit breaker unit 3, and a fire extinguishing device 6 connected to the output end of the first AND logic gate 4. The output end of the OR logic gate unit 2 is connected to the input end of the first AND logic gate 4.

[0026] The transformer fire response device of this embodiment combines the fire feedback signal sent by the OR logic gate unit 2 and the open circuit feedback signal sent by the circuit breaker unit 3 to conduct fire response. Specifically, after the OR logic gate unit 2 receives the action signal or the disconnection signal from the line type temperature sensing cable unit 1, it will send a fire feedback signal to the first AND logic gate 4. Only when the first AND logic gate 4 receives the fire feedback signal from the OR logic gate unit 2 and the open circuit feedback signal from the circuit breaker unit 3, will it transmit a fire alarm signal to the fire extinguishing device 6, thereby activating the fire extinguishing device 6 to perform fire extinguishing work, effectively avoiding false alarms. Even when the transformer explodes and the line type temperature sensing cable unit 1 is damaged and disconnected before sending the action signal, the OR logic gate unit 2 can still recognize the disconnection signal and feedback the signal to the first AND logic gate 4, ensuring the integrity of the fire alarm signal, guaranteeing that the fire extinguishing device 6 can receive the alarm in time and take corresponding fire extinguishing measures, and avoiding the spread of fire caused by signal loss, with high reliability and good safety.

[0027] Further, in this embodiment, the line type temperature sensing cable unit 1 includes a first line type temperature sensing cable 11 and a second line type temperature sensing cable 12, and the OR logic gate unit 2 includes a first OR logic gate 21 and a second OR logic gate 22. The first line type temperature sensing cable 11 is connected to the input end of the first OR logic gate 21, and the second line type temperature sensing cable 12 is connected to the input end of the second OR logic gate 22. The output ends of the first OR logic gate 21 and the second OR logic gate 22 are both connected to the input end of the first AND logic gate 4. By setting the first line type temperature sensing cable 11 and the second line type temperature sensing cable 12, and correspondingly setting the first OR logic gate 21 and the second OR logic gate 22, it can effectively avoid false alarms caused by a single line type temperature sensing cable due to long-term exposure to high electromagnetic fields and aging, which may cause the fire extinguishing device 6 to start abnormally, further improving the anti-false alarm ability. Of course, in other embodiments, the number of line type temperature sensing cables in the line type temperature sensing cable unit 1 can be adjusted.

[0028] Further, in this embodiment, the circuit breaker unit 3 includes a second AND logic gate 5 and three circuit breakers (not shown in the figure) respectively connected to the high voltage side, medium voltage side, and low voltage side of the transformer. Each circuit breaker is connected to the input end of the second AND logic gate 5, and the output end of the second AND logic gate 5 is connected to the input end of the first AND logic gate 4, which can provide overload and open circuit protection for each side winding of the transformer. Each circuit breaker is connected to the input end of the second AND logic gate 5, and the output end of the second AND logic gate 5 is connected to the input end of the first AND logic gate 4. When all circuit breakers trip, the second AND logic gate 5 will send an open circuit feedback signal to the first AND logic gate 4, avoiding the abnormal start of the fire extinguishing device 6 caused by partial circuit breaker tripping without an actual fire, further improving the anti-false alarm ability.

[0029] Furthermore, in this embodiment, both the first linear heat detection cable 11 and the second linear heat detection cable 12 are recoverable heat detection cables. After the fire is handled, the first linear heat detection cable 11 and the second linear heat detection cable 12 can continue to be put into use without being damaged, improving the utilization efficiency and saving resources.

[0030] Of course, in other embodiments, the first linear heat detection cable 11 and the second linear heat detection cable 12 can also be non-recoverable heat detection cables. Due to the working principle of non-recoverable heat detection cables, it is difficult to provide a broken wire feedback signal. A first broken wire monitoring component for monitoring whether the first linear heat detection cable 11 is broken and a second broken wire monitoring component for monitoring whether the second linear heat detection cable 12 is broken can be provided. The first broken wire monitoring component is connected to the first OR logic gate 21 to transmit the broken wire feedback signal of the first linear heat detection cable 11 to the first OR logic gate 21, and the second broken wire monitoring component is connected to the second OR logic gate 22 to transmit the broken wire feedback signal of the second linear heat detection cable 12 to the second OR logic gate 22.

[0031] Embodiment 2

[0032] Figure 2 Another embodiment of the transformer fire response device of the present utility model is shown. This embodiment is substantially the same as Embodiment 1, with the difference being that:

[0033] The transformer fire response device of this embodiment further includes a special fire detector unit 7 and a majority decision gate 8. The output terminals of the special fire detector unit 7, the first OR logic gate 21, and the second OR logic gate 22 are all connected to the input terminal of the majority decision gate 8, and the output terminal of the majority decision gate 8 is connected to the input terminal of the first AND logic gate 4. Specifically, the special fire detector unit 7 includes a first special fire detector 71 and a second special fire detector 72, and both the first special fire detector 71 and the second special fire detector 72 are connected to the input terminal of the majority decision gate 8. Of course, in other embodiments, the number of special fire detectors in the special fire detector unit 7 can be adjusted. It should be noted that the majority decision gate 8 is a digital logic gate that determines the output state according to the majority of the input signals. When the number of high-level input signals reaches more than half of the total number of inputs, the majority decision gate 8 will output a high level. For example: there are a total of 3 input signals, and only when two or more input signals are high level, the majority decision gate 8 will output a high level. When there are a total of 4 input signals, only when two or more input signals are high level, the majority decision gate 8 will output a high level.

[0034] For the transformer fire response device of this embodiment, when the majority decision gate 8 receives any two of the fire feedback signals from the first special fire detector 71, the fire feedback signal from the second special fire detector 72, the fire feedback signal from the first OR logic gate 21, and the fire feedback signal from the second OR logic gate 22, it will send a fire response signal to the first AND logic gate 4. Only when the first AND logic gate 4 receives the fire response signal sent by the majority decision gate 8 and the open circuit feedback signal of the circuit breaker unit 3, will it send a fire alarm signal to the fire extinguishing device 6 for fire extinguishing. Compared with the first embodiment, the safety redundancy is enhanced, and it is avoided that the linear temperature sensing cable unit 1 fails to send an action signal in time when a fire occurs or cannot send an action signal due to a fault, resulting in the inability of the fire extinguishing device 6 to start normally to extinguish the fire on the transformer, further enhancing the reliability and safety.

[0035] Furthermore, in this embodiment, the special fire detector unit 7 is arranged at intervals with the transformer, that is to say, the special fire detector unit 7 does not contact the transformer, avoiding damage to the special fire detector unit 7 caused by the combustion and explosion of the transformer.

[0036] Furthermore, the first special fire detector 71 and the second special fire detector 72 can be infrared flame detectors or image-type fire detectors. The infrared flame detector can identify the infrared spectral characteristics generated by the flame and is not affected by ambient light, and is suitable for environments containing a large amount of smoke and dust; the image-type fire detector detects fires by analyzing video images. The detector uses a camera to capture scene images and analyzes the image content through image processing algorithms to identify fire characteristics such as smoke and flame, and can monitor a large range. Of course, in other embodiments, other special fire detectors can also be selected according to the actual environment where the transformer is located, which will not be elaborated here.

[0037] Embodiment Three

[0038] Figure 3 Another embodiment of the transformer fire response device of the present utility model is shown. This embodiment is substantially the same as the first embodiment, except that:

[0039] The transformer fire response device of this embodiment further includes a manual fire alarm button 9 connected to the input end of the AND-OR logic gate unit 2. As long as the OR logic gate unit 2 receives the disconnection signal of the linear temperature sensing cable unit 1, the action signal of the linear temperature sensing cable unit 1, or the alarm signal of the manual fire alarm button 9, it can send a fire feedback signal. Compared with the first embodiment, it is avoided that the linear temperature sensing cable unit 1 fails to send an action signal in time during long-term exposure to strong magnetic fields and aging, resulting in the failure of the fire extinguishing device 6 to start normally, improving the safety and reliability, and being more suitable for the situation where there are staff to monitor the transformer in real time.

[0040] Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the technical content disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A transformer fire response device, characterized in that: It includes a linear heat detection cable unit (1) provided on a transformer, an OR logic gate unit (2) for receiving an action signal or a disconnection signal from the linear heat detection cable unit (1), a circuit breaker unit (3) connected to the transformer, a first AND logic gate (4) for receiving a disconnection signal from the circuit breaker unit (3), and a fire extinguishing device (6) connected to the output end of the first AND logic gate (4). The output end of the OR logic gate unit (2) is connected to the input end of the first AND logic gate (4).

2. The transformer fire response device according to claim 1, wherein: The linear heat detection cable unit (1) includes a first linear heat detection cable (11) and a second linear heat detection cable (12). The OR logic gate unit (2) includes a first OR logic gate (21) and a second OR logic gate (22). The first linear heat detection cable (11) is connected to the input end of the first OR logic gate (21), and the second linear heat detection cable (12) is connected to the input end of the second OR logic gate (22). The output ends of the first OR logic gate (21) and the second OR logic gate (22) are both connected to the input end of the first AND logic gate (4).

3. The transformer fire response device according to claim 2, characterized in that: It further includes a special fire detector unit (7) and a majority decision gate (8). The special fire detector unit (7), the output end of the first OR logic gate (21), and the output end of the second OR logic gate (22) are all connected to the input end of the majority decision gate (8). The output end of the majority decision gate (8) is connected to the input end of the first AND logic gate (4).

4. The transformer fire response device according to claim 3, characterized in that: The special fire detector unit (7) is arranged at intervals from the transformer.

5. The transformer fire response device according to claim 3, characterized in that: The special fire detector unit (7) includes a first special fire detector (71) and a second special fire detector (72). Both the first special fire detector (71) and the second special fire detector (72) are connected to the input end of the majority decision gate (8).

6. The transformer fire response device according to claim 5, wherein: The first special fire detector (71) and the second special fire detector (72) are infrared flame detectors or image-type fire detectors.

7. The transformer fire response device according to claim 1, characterized in that: It further includes a manual fire alarm button (9) connected to the input end of the OR logic gate unit (2).

8. The transformer fire response device according to claim 1, characterized in that: The linear heat detection cable unit (1) is a recoverable heat detection cable unit.

9. The transformer fire response device according to claim 1, characterized in that: The linear heat detection cable unit (1) is a non-recoverable heat detection cable unit and is equipped with a disconnection monitoring component.

10. The transformer fire response device according to any one of claims 1 to 9, characterized in that: The circuit breaker unit (3) includes a second AND logic gate (5) and three circuit breakers respectively connected to the high-voltage side, medium-voltage side, and low-voltage side of the transformer. Each circuit breaker is connected to the input end of the second AND logic gate (5). The output end of the second AND logic gate (5) is connected to the input end of the first AND logic gate (4).

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