Arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened
By designing the arc voltage fault detection and alarm system after the opening of the refining furnace vacuum circuit breaker, the problem of the arc voltage fault not being promptly alarmed after the opening of the refining furnace is solved, and the effect of timely discovering faults and preventing accidents is achieved.
Patent Information
- Application Number
- CN202411310327.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-04-08
AI Technical Summary
In refining furnaces, there may be arc pressure failure after the vacuum circuit breaker is opened, but the existing system cannot alarm in time, making it difficult to quickly detect the cause of the failure and may endanger the safety of the operator.
An arc voltage fault detection alarm system was designed after the vacuum circuit breaker of the refining furnace was opened. This system used the arc voltage from the analog signal to numerical value to determine whether the three-phase arc voltage was greater than 30V, and in the high-voltage non-closing state, the closing indicator light flashed and the HMI pop-up alarm was alerted to the operator for the fault condition.
The system can detect damage to the vacuum arc extinguishing chamber in advance and deal with it in a timely manner, avoid high-pressure blasting and other accidents, and ensure the safety of operators.
Smart Images
Figure CN119785539A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of refinery furnace alarm system design, in particular to an arc voltage fault detection alarm system after a refinery furnace vacuum circuit breaker is opened. Background Art
[0002] The vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no need for maintenance after arc extinguishing, and is widely used in distribution networks.
[0003] Vacuum circuit breakers are indoor power distribution devices in 3~10kV, 50Hz three-phase AC systems. They can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. They are particularly suitable for use in places that require oil-free operation, less maintenance, and frequent operation. Circuit breakers can be configured in center cabinets, double-layer cabinets, and fixed cabinets to control and protect high-voltage electrical equipment.
[0004] Vacuum circuit breakers can usually be divided into multiple voltage levels. The low-voltage type is generally used for explosion-proof electrical applications, such as coal mines, steel mills, etc. The rated current reaches 5000A, the breaking current reaches a good level of 50kA, and has developed to a voltage level of 35kV.
[0005] The opening and closing pull rod of the vacuum circuit breaker in the refining furnace is broken, resulting in arc voltage on the electrode after the circuit breaker is opened, or the vacuum interrupter of the vacuum circuit breaker is broken down and turned on, and there is still arc voltage after opening. There is no alarm prompt after the fault occurs, and the cause of the fault cannot be found quickly. At this time, if the operator touches the electrode, it may be dangerous. Summary of the invention
[0006] The technical problem to be solved by the present invention is that arc voltage still exists after the circuit breaker is opened, and there is no alarm prompt after a fault occurs, so the cause of the fault cannot be found quickly, and it may be dangerous if the operator touches the electrode at this time.
[0007] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is an arc voltage fault detection and alarm system after the vacuum circuit breaker of a refining furnace is opened, comprising the following steps: Step 1: Convert the arc voltage from an analog signal into a numerical value; Step 2: Check if the arc voltage of three phases A, B and C is greater than 30V; Step 3: In the high voltage non-closing state, the arc voltage is greater than 30V, and the closing indicator light flashes to alarm; Step 4: In the high voltage non-closing state, the arc voltage is greater than 30V, and the circuit breaker is opened for 2-4 seconds, M8.0 is powered, Q0.3 is energized, and the HMI pop-up window alarm is triggered; Step 5: The Q0.3 vacuum circuit breaker alarm is energized and high voltage closing is not allowed.
[0008] The beneficial effects achieved by the present invention using the above structure are as follows: after the vacuum interrupter of the vacuum circuit breaker is slightly broken down, a small arc voltage will also be generated behind the circuit breaker in the open state. This alarm system can be used to detect damage to the vacuum interrupter early and handle it in time to avoid accidents such as high-voltage explosions. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a program setting diagram of step 1 of the arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened proposed by the present invention; Figure 2 It is a program setting diagram of step 2 of the arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened proposed by the present invention; Figure 3 It is a program setting diagram of step 3 of the arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened proposed by the present invention; Figure 4 It is a program setting diagram of step 4 of the arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened proposed by the present invention; Figure 5 This is a program setting diagram of step 5 of the arc voltage fault detection and alarm system after the refining furnace vacuum circuit breaker is opened proposed by the present invention. DETAILED DESCRIPTION
[0010] As the instruction manual Figure 1~Figure 5 As shown, the present invention is an arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened, and DB2.DBX0.0 in the figure is a reset button. Example 1
[0011] The steps include: Step 1: Convert the arc voltage from an analog signal into a numerical value; Step 2: Check if the arc voltage of three phases A, B and C is greater than 30V; Step 3: In the high voltage non-closing state, the arc voltage is greater than 30V, and the closing indicator light flashes to alarm; Step 4: In the high voltage non-closing state, the arc voltage is greater than 30V, and the circuit breaker is opened for 2 seconds, M8.0 is powered, Q0.3 is energized, and the HMI pop-up window alarm is triggered; Step 5: The Q0.3 vacuum circuit breaker alarm is energized and high voltage closing is not allowed. Example 2
[0012] The steps include: Step 1: Convert the arc voltage from an analog signal into a numerical value; Step 2: Check if the arc voltage of three phases A, B and C is greater than 30V; Step 3: In the high voltage non-closing state, the arc voltage is greater than 30V, and the closing indicator light flashes to alarm; Step 4: In the high voltage non-closing state, the arc voltage is greater than 30V, and the circuit breaker is opened for 3 seconds, M8.0 is powered, Q0.3 is energized, and the HMI pop-up window alarm is triggered; Step 5: The Q0.3 vacuum circuit breaker alarm is energized and high voltage closing is not allowed. Example 3
[0013] The steps include: Step 1: Convert the arc voltage from an analog signal into a numerical value; Step 2: Check if the arc voltage of three phases A, B and C is greater than 30V; Step 3: In the high voltage non-closing state, the arc voltage is greater than 30V, and the closing indicator light flashes to alarm; Step 4: In the high-voltage non-closed state, the arc voltage is greater than 30V, and the circuit breaker is opened for 4 seconds, M8.0 is powered, Q0.3 is energized, and the HMI pop-up window alarm is triggered; Step 5: The Q0.3 vacuum circuit breaker alarm is energized and high voltage closing is not allowed.
[0014] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. Arc voltage fault detection and alarm system after the vacuum circuit breaker of the refining furnace is opened, characterized in that: The steps include: Step 1: Convert the arc voltage from an analog signal into a numerical value; Step 2: Check if the arc voltage of three phases A, B and C is greater than 30V; Step 3: In the high voltage non-closing state, the arc voltage is greater than 30V, and the closing indicator light flashes to alarm; Step 4: In the high voltage non-closing state, the arc voltage is greater than 30V, and the circuit breaker is opened for 2-4 seconds, M8.0 is powered, Q0.3 is energized, and the HMI pop-up window alarm is triggered; Step 5: The Q0.3 vacuum circuit breaker alarm is energized and high voltage closing is not allowed.