Main transformer fire control method and system suitable for two-thirds wiring

Abstract

The invention provides a main transformer fire-fighting control method and system suitable for two-thirds wiring, and the method comprises the three steps: dividing the linkage between a main transformer protection cabinet and a main transformer fire-fighting system into a main transformer live-line state and a main transformer non-live-line state; the uncharged state of the main transformer when the main transformer fire extinguishing system is started is ensured by locking tripping signals and division signals of circuit breakers on the high-voltage side and the low-voltage side of the main transformer respectively; a fire signal of the main transformer is sent out by the main transformer fire alarm control cabinet, in order to avoid misjudgment, after at least the fire alarm signals of the two main transformer detectors are received, it is determined that the main transformer is in a fire state, and the main transformer fire alarm signals are sent out; through the logic, the main transformer can be ensured not to be electrified in a fire disaster state, secondary damage to the main transformer is avoided, and meanwhile, the main transformer fire extinguishing system is quickly started.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology for main transformers, and in particular to a fire control method and system for main transformers with two-thirds wiring. Background Technology

[0002] To meet the ever-increasing demand for electricity, a large number of new energy power plants have been put into operation in recent years. In these power plants, a two-thirds main wiring structure is most common. Within this structure, the main transformer is the most critical electrical equipment, and ensuring the proper functioning of its fire protection system is crucial for its operation. With the promotion of unmanned operation modes in 500kV substations, the main transformer, as a core piece of equipment, plays an extremely important role in minimizing fire damage by enabling immediate fire suppression.

[0003] Current transformer fire suppression systems typically activate directly or after a simple delay upon detecting a fire signal. However, if the main transformer is still energized before activating a system like a water sprinkler system, the fine water mist may cause a ground fault in the transformer, resulting in secondary damage. This secondary damage caused by fire suppression operations can even lead to more severe permanent equipment damage than the initial fire, resulting in significant economic losses and risks to power grid operation. This is especially true for power plants with a two-thirds main wiring structure, where the main transformer wiring is complex and requires more reliable electrical isolation logic to prevent fire suppression while the transformer is energized. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fire control method for main transformers with two-thirds wiring, which can solve the problem that live fire suppression of the main transformer in existing transformer fire protection systems may cause grounding short circuit faults.

[0005] Therefore, the present invention adopts the following technical solution: A fire control method for a main transformer with two-thirds wiring includes the following steps: Step 1: The main transformer fire alarm control cabinet confirms whether the main transformer is in a fire state based on the alarm signals from at least two independent main transformer fire detectors. After determining that the main transformer is in a fire state, it outputs the main transformer fire alarm signal to the main transformer protection cabinet. Step 2: After receiving the main transformer fire alarm signal, the main transformer protection cabinet performs the corresponding safety logic verification based on the current state of the main transformer: If the main transformer is in a de-energized state, it verifies the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal; If the main transformer is in a energized state, it controls the disconnection of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and then verifies the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal. Step 3: The main transformer fire alarm control module in the main transformer fire alarm control cabinet receives the main transformer fire alarm system signal. At this time, the main transformer is not energized, and the main transformer fire alarm system is turned on to start fire extinguishing.

[0006] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions: The fire status determination in step one is completed by the first logic processing unit in the main transformer fire alarm control cabinet. The first logic processing unit receives alarm signals from at least two independent main transformer fire detectors and performs a logical AND operation on the received alarm signals. Only when all alarm signals indicate a fire, it outputs a main transformer fire alarm signal.

[0007] The safety logic verification in step two is completed collaboratively by the second, third, and fourth logic processing units within the main transformer protection cabinet. The second logic processing unit receives the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The third logic processing unit receives the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The fourth logic processing unit receives the operation results from the second and third logic processing units and performs a logical OR operation to output the main transformer fire protection system signal.

[0008] The second logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid. The third logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid.

[0009] When either the second or third logic processing unit outputs a valid logic result, the fourth logic processing unit outputs a main transformer fire protection system signal.

[0010] The purpose of this invention is also to overcome the shortcomings of the prior art and provide a fire control system for main transformers with two-thirds wiring, which can solve the problem that the main transformer may experience grounding short circuit faults when extinguishing fires while it is energized in the existing transformer fire protection system.

[0011] Therefore, the present invention adopts the following technical solution: A fire control system for a main transformer with two-thirds wiring includes a main transformer fire alarm control cabinet, a main transformer protection cabinet, and a main transformer fire protection system. The main transformer fire alarm control cabinet is equipped with a first logic processing unit and a main transformer fire protection system control module. The main transformer protection cabinet is equipped with a second logic processing unit, a third logic processing unit, and a fourth logic processing unit. The first logic processing unit is communicatively connected to the second logic processing unit and the third logic processing unit, respectively. The fourth logic processing unit is communicatively connected to the second logic processing unit, the third logic processing unit, and the main transformer fire protection system control module, respectively. The main transformer fire protection system control module is communicatively connected to the main transformer fire protection system.

[0012] The present invention also proposes a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-5.

[0013] The present invention also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method according to any one of claims 1-5.

[0014] Compared with the prior art, this invention has the following advantages and beneficial effects: the interlock between the main transformer protection cabinet and the main transformer fire protection system is divided into a main transformer energized state and a main transformer de-energized state, and the tripping signals and tripping signals of the circuit breakers on the high and low voltage sides of the main transformer are blocked respectively to ensure that the main transformer is de-energized when the main transformer fire protection system is started; the fire signal of the main transformer is issued by the main transformer fire alarm control cabinet. In order to avoid false judgment, the main transformer is determined to be in a fire state only after receiving fire alarm signals from at least two main transformer detectors, and a main transformer fire alarm signal is issued; through the above logic, it can be ensured that the main transformer is de-energized when the main transformer fire protection system is started during a fire, avoiding secondary damage to the main transformer while quickly starting the main transformer fire protection system. Attached Figure Description

[0015] Figure 1 This is a two-thirds electrical main wiring diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the locking logic of the present invention. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] This invention provides a fire control method for a main transformer with two-thirds wiring, comprising the following steps: Step 1: The main transformer fire alarm control cabinet confirms whether the main transformer is in a fire state based on the alarm signals from at least two independent main transformer fire detectors. After determining that the main transformer is in a fire state, it outputs the main transformer fire alarm signal to the main transformer protection cabinet. Step 2: After receiving the main transformer fire alarm signal, the main transformer protection cabinet performs the corresponding safety logic verification based on the current state of the main transformer: If the main transformer is in a de-energized state, it verifies the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal; If the main transformer is in a energized state, it controls the disconnection of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and then verifies the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal. Step 3: The main transformer fire protection system control module in the main transformer fire alarm control cabinet receives the main transformer fire protection system signal. At this time, the main transformer is not energized. The main transformer fire protection system is activated to start the fire extinguishing process. The fire status judgment in Step 1 is completed by the first logic processing unit in the main transformer fire alarm control cabinet. The first logic processing unit receives alarm signals from at least two independent main transformer fire detectors and performs a logical AND operation on the received alarm signals. Only when all alarm signals indicate a fire, the main transformer fire alarm signal is output.

[0020] The safety logic verification in step two is completed collaboratively by the second, third, and fourth logic processing units within the main transformer protection cabinet. The second logic processing unit receives the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The third logic processing unit receives the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The fourth logic processing unit receives the operation results from the second and third logic processing units and performs a logical OR operation to output the main transformer fire protection system signal.

[0021] The second logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid. The third logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid.

[0022] When either the second or third logic processing unit outputs a valid logic result, the fourth logic processing unit outputs a main transformer fire protection system signal.

[0023] This invention provides a fire control system for a main transformer with two-thirds wiring, comprising a main transformer fire alarm control cabinet, a main transformer protection cabinet, and a main transformer fire protection system. The main transformer fire alarm control cabinet is equipped with a first logic processing unit and a main transformer fire protection system control module. The main transformer protection cabinet is equipped with a second logic processing unit, a third logic processing unit, and a fourth logic processing unit. The first logic processing unit is communicatively connected to the second and third logic processing units, and the fourth logic processing unit is communicatively connected to the second and third logic processing units and the main transformer fire protection system control module. The main transformer fire protection system control module is communicatively connected to the main transformer fire protection system.

[0024] like Figure 1 As shown, this is a common two-thirds electrical main wiring configuration in new energy power plants, where CB1 and CB2 are high-voltage side circuit breakers in two-thirds of the main transformer series, and CB3 is the low-voltage side circuit breaker of the main transformer. like Figure 2 As shown, after the main transformer fire alarm control cabinet receives two fire alarm signals from the main transformer fire detectors, it performs AND logic to determine that the main transformer is in a fire state and outputs the main transformer fire alarm signal to the main transformer protection cabinet. The fire signal of the main transformer is sent from the main transformer fire alarm control cabinet to the main transformer protection cabinet. After the main transformer protection cabinet determines that the interlocking logic is met, it releases the main transformer fire protection system signal to the main transformer fire alarm control cabinet, thereby activating the main transformer fire protection system.

[0025] like Figure 2As shown, after the main transformer protection cabinet receives the main transformer fire alarm signal from the main transformer fire alarm control cabinet, if the main transformer is in a de-energized state (maintenance state), the main transformer fire alarm signal, the occupancy signals of the main transformer high-voltage side circuit breakers CB1 and CB2, and the occupancy signal of the main transformer low-voltage side circuit breaker CB3 are subjected to AND logic judgment. If all conditions are met, a determination signal is output. like Figure 2 As shown, after the main transformer protection cabinet receives the fire alarm signal from the main transformer fire alarm control cabinet, if the main transformer is in a live state (normal operating state) at this time, the fire alarm signal, the trip signals of the main transformer high voltage side circuit breakers CB1 and CB2, and the trip signal of the main transformer low voltage side circuit breaker CB3 are judged by AND logic. If all conditions are met, a determination signal is output. like Figure 2 As shown, in the above two main transformer states, if either of the above conditions is satisfied, the main transformer protection cabinet will output a signal to the main transformer fire alarm cabinet to release the main transformer fire protection system to the control module of the main transformer fire alarm control cabinet. like Figure 2 As shown, after receiving the signal from the main transformer protection cabinet to release the main transformer fire protection system, the control module of the main transformer fire alarm control cabinet sends a start signal to the main transformer fire protection system, thereby activating the main transformer fire protection system.

[0026] The present invention provides a fire control method for main transformers with two-thirds wiring, which can realize standardized design, factory production, assembly construction and modular construction.

[0027] Based on the description and accompanying drawings of this invention, those skilled in the art can readily manufacture or use the fire control method of this invention for main transformers with two-thirds wiring, and can achieve the positive effects described in this invention.

[0028] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first" and "second" are also used merely for brevity and are not intended to indicate or imply relative importance.

[0029] Furthermore, in practicing the claims of this invention, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are covered by the scope of the claims of the present invention, and will not be listed here.

Claims

1. A fire control method for a main transformer with two-thirds wiring, characterized in that, Includes the following steps: Step 1: The main transformer fire alarm control cabinet confirms whether the main transformer is in a fire state based on the alarm signals from at least two independent main transformer fire detectors. After determining that the main transformer is in a fire state, it outputs the main transformer fire alarm signal to the main transformer protection cabinet. Step 2: After receiving the main transformer fire alarm signal, the main transformer protection cabinet performs the corresponding safety logic verification based on the current state of the main transformer: If the main transformer is in a de-energized state, it verifies the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal; If the main transformer is in a energized state, it controls the disconnection of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and then verifies the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers and determines whether they are all valid. If they are all valid, it outputs the main transformer fire protection system signal. Step 3: The main transformer fire alarm control module in the main transformer fire alarm control cabinet receives the main transformer fire alarm system signal. At this time, the main transformer is not energized, and the main transformer fire alarm system is turned on to start fire extinguishing.

2. The fire control method for a main transformer with two-thirds wiring as described in claim 1, characterized in that, The fire status determination in step one is completed by the first logic processing unit in the main transformer fire alarm control cabinet. The first logic processing unit receives alarm signals from at least two independent main transformer fire detectors and performs a logical AND operation on the received alarm signals. Only when all alarm signals indicate a fire, the main transformer fire alarm signal is output.

3. The fire control method for a main transformer with two-thirds wiring as described in claim 1, characterized in that, The safety logic verification in step two is completed collaboratively by the second, third, and fourth logic processing units within the main transformer protection cabinet. The second logic processing unit receives the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The third logic processing unit receives the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers, and performs a logical AND operation. The fourth logic processing unit receives the operation results from the second and third logic processing units and performs a logical OR operation to output the main transformer fire protection system signal.

4. A fire control method for a main transformer with two-thirds wiring as described in claim 3, characterized in that, The second logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip position signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid. The third logic processing unit outputs a valid logic result only when the main transformer fire alarm signal and the trip signals of the low-voltage side circuit breaker and the two high-voltage side circuit breakers are all valid.

5. A fire control method for a main transformer with two-thirds wiring as described in claim 4, characterized in that, When either the second or third logic processing unit outputs a valid logic result, the fourth logic processing unit outputs a main transformer fire protection system signal.

6. A fire control system for a main transformer with two-thirds wiring, used to implement the fire control method for a main transformer with two-thirds wiring as described in any one of claims 1-5, characterized in that, The system includes a main transformer fire alarm control cabinet, a main transformer protection cabinet, and a main transformer fire protection system. The main transformer fire alarm control cabinet is equipped with a first logic processing unit and a main transformer fire protection system control module. The main transformer protection cabinet is equipped with a second logic processing unit, a third logic processing unit, and a fourth logic processing unit. The first logic processing unit is communicatively connected to the second logic processing unit and the third logic processing unit, respectively. The fourth logic processing unit is communicatively connected to the second logic processing unit, the third logic processing unit, and the main transformer fire protection system control module, respectively. The main transformer fire protection system control module is communicatively connected to the main transformer fire protection system.

7. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1-5.

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