Fire-fighting device, converter, control method and related device

Abstract

The invention discloses a fire-fighting device, a converter, a control method and a related device.The fire-fighting device comprises a controller and a switching device, a first port of the controller is connected with fire-fighting equipment and the switching device, and if the level state of the first port is a preset level state, a fire-fighting alarm signal is output; when the fire-fighting equipment signal sent by the fire-fighting equipment is received, the electrical parameters of the protected equipment can be obtained, and then the switching device is controlled to be closed when the electrical parameters meet the preset conditions. Therefore, on the basis that the fire-fighting equipment can protect the protected equipment, if the electrical parameters meet the preset conditions, the switching device can be controlled to be switched on, so that the level state of the first port is the preset level state, the fire-fighting alarm signal is continuously output, and the safety of the power electronic equipment is further improved.

Description

Technical Field

[0001] This application relates to the field of fire protection technology, and in particular to a fire protection device, converter, control method and related devices. Background Technology

[0002] Currently, in order to ensure the safety of power electronic equipment operation, it is necessary to equip power electronic equipment with corresponding fire-fighting devices. For example, a suspended aerosol automatic fire extinguishing device can be installed in the converter of a generator set. When a fire occurs inside the converter, the heat-sensitive wire of the aerosol automatic fire extinguishing device will burn when the temperature inside the converter reaches the specified temperature, causing the aerosol to be sprayed, thereby achieving the fire extinguishing effect.

[0003] However, power electronic equipment still suffers from low safety when using fire-fighting equipment provided by related technologies. Summary of the Invention

[0004] This application provides a fire-fighting device, converter, control method, and related apparatus, aimed at further improving the safety of power electronic equipment.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a fire-fighting device, including a switching device and a controller; a first end of the switching device is connected to a power supply, and a second end of the switching device is connected to a first port of the controller, the first port of the controller being configured to connect to the fire-fighting equipment of the protected device;

[0007] The controller is used to output a fire alarm signal if the level state of the first port is a preset level state; and to control the switching device to close if the electrical parameters of the protected equipment meet preset conditions when receiving a fire equipment signal from the fire equipment.

[0008] Among them, the preset conditions are at least one of the following: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance.

[0009] Optionally, before the switching device is closed, the controller is also used to identify the level state of the first port as a preset level state and output a fire alarm signal.

[0010] Optionally, the switching device is a relay, which includes contacts and a coil. The first end of the contacts is connected to a first power supply, the second end of the contacts is connected to a first port of the controller, the first end of the coil is connected to a second power supply, and the second end of the coil is connected to a second port of the controller. The first power supply and the second power supply may be the same power supply or different power supplies.

[0011] The controller is used to control the level state of the second port to close the contacts when the electrical parameters meet preset conditions.

[0012] Optionally, the controller is also configured to acquire a hardware reset signal sent by the protected device after the control switching device is closed; and control the switching device to open according to the hardware reset signal.

[0013] Optionally, the fire-fighting equipment includes a temperature-sensitive normally open contact, with the first end of the temperature-sensitive normally open contact connected to the fire-fighting power supply and the second end of the temperature-sensitive normally open contact connected to the first port of the controller.

[0014] Optionally, the fire protection power supply and the power supply may be the same power source, or the fire protection power supply and the power supply may be different power sources.

[0015] Optionally, after outputting the fire alarm signal, the controller is also used to output a start signal when the switching device is open and the level state of the first port is not a preset level state.

[0016] Optionally, the controller is also used to acquire the detection reset signal sent by the protected equipment if the fire alarm signal does not disappear after a preset time and the electrical parameters of the protected equipment do not meet the preset conditions; and output a start signal according to the detection reset signal.

[0017] Secondly, embodiments of this application provide a control method for a fire-fighting device, the fire-fighting device including a switching device and a controller; a first end of the switching device is connected to a power supply, a second end of the switching device is connected to a first port of the controller, and the first port of the controller is configured to connect to the fire-fighting equipment of the protected device;

[0018] Control methods include:

[0019] Upon receiving a fire equipment signal from the fire equipment, if the electrical parameters of the protected equipment meet the preset conditions, the control switch is closed; if the level state of the first port is the preset level state, a fire alarm signal is output; the fire equipment signal represents the operation of the fire equipment, and the electrical parameters represent the electrical parameters of the protected equipment when the fire equipment is operating;

[0020] Among them, the preset conditions are at least one of the following: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance.

[0021] Optionally, before the switching device is closed, the method further includes: identifying the level state of the first port as a preset level state and outputting a fire alarm signal.

[0022] Optionally, the switching device is a relay, which includes contacts and a coil. The first end of the contacts is connected to a first power supply, the second end of the contacts is connected to a first port of the controller, the first end of the coil is connected to a second power supply, and the second end of the coil is connected to a second port of the controller.

[0023] When the electrical parameters of the protected equipment meet preset conditions, the control switching device closes, including:

[0024] When the electrical parameters of the protected device meet the preset conditions, control the level state of the second port.

[0025] Optional, also includes:

[0026] After the control switch is closed, the hardware reset signal sent by the protected device is acquired;

[0027] The switching device is turned off based on the hardware reset signal.

[0028] Optionally, after outputting the fire alarm signal, the following may also be included:

[0029] When the switching device is off and the level state of the first port is not the preset level state, a start signal is output.

[0030] Optionally, it also includes: if the fire alarm signal does not disappear after a preset time and the electrical parameters of the protected equipment do not meet the preset conditions, acquiring the detection reset signal sent by the protected equipment; and outputting a start signal based on the detection reset signal.

[0031] Thirdly, embodiments of this application provide a converter, which includes a controller, multiple parallel converter units, and a fire-fighting device as described in the first aspect, wherein the controller is connected to each converter unit.

[0032] Thirdly, embodiments of this application provide a control device, including a processor and a memory, wherein the memory is used to store programs, instructions or code, and the processor is used to execute the programs, instructions or code in the memory to complete the control method of the fire-fighting device as described in the second aspect.

[0033] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which is loaded by a processor to execute the control method of the fire-fighting device as described in the second aspect.

[0034] The fire-fighting device provided in this application embodiment has a controller whose first port is connected to both fire-fighting equipment and a switching device. If the voltage level of the first port is at a preset level, a fire alarm signal is output. When a signal from the fire-fighting equipment is received, the electrical parameters of the protected equipment can be obtained. Then, when the electrical parameters meet preset conditions, the switching device is controlled to close. Thus, based on the fire-fighting equipment's ability to protect the protected equipment, if the electrical parameters meet preset conditions, the switching device can be controlled to close, causing the voltage level of the first port to reach the preset level, thereby continuously outputting a fire alarm signal and further improving the safety of the power electronic equipment. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a structural schematic diagram of a fire-fighting device provided in an embodiment of this application;

[0037] Figure 2a This is a first structural schematic diagram of a fire-fighting device provided in an embodiment of this application;

[0038] Figure 2b This is a schematic diagram of a second structure of a fire-fighting device provided in an embodiment of this application;

[0039] Figure 2c This is a third structural schematic diagram of a fire-fighting device provided in an embodiment of this application;

[0040] Figure 2d This is a fourth structural schematic diagram of a fire-fighting device provided in an embodiment of this application;

[0041] Figure 3 A schematic diagram of another fire-fighting device provided in the embodiments of this application;

[0042] Figure 4 A schematic flowchart illustrating a control method for a fire-fighting device provided in an embodiment of this application;

[0043] Figure 5 A schematic flowchart illustrating another control method for a fire-fighting device provided in an embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0045] Currently, in order to ensure the safe operation of power electronic equipment, it is necessary to equip power electronic equipment with corresponding fire-fighting devices so that when a fire occurs inside the power electronic equipment, the open flame can be extinguished in time, thus avoiding serious damage to the power electronic equipment.

[0046] As an example, let's take the converter in a generator set as an example of power electronic equipment and aerosol fire extinguishing equipment as an example. Assume that the aerosol fire extinguishing device is installed inside the converter in a suspended manner. When a fire starts inside the converter, any point on the heat-sensitive wire in the aerosol fire extinguishing device will reach a preset temperature and begin to burn. The heat-sensitive wire will then burn into the interior of the aerosol, triggering its ejection. The metal salt particles ejected from the aerosol can absorb a large amount of heat energy inside the converter, reducing the flame temperature. Furthermore, the metal salt particles in the aerosol can adsorb active radicals in the combustion, reducing combustion free radicals, thereby extinguishing the open flame.

[0047] In the above process, the feedback contact inside the aerosol fire extinguishing device is a normally open, heat-sensitive contact. When the heat-sensitive wire burns into the interior of the aerosol, triggering aerosol release, the contact will be affected by the high temperature and change from normally open to normally closed. This feedback signal will be sent to the DI port (Digital Input) of the ARM (Advanced RISC Machine) detection system of the converter. When the ARM detection system detects this feedback signal, it will trigger a fire alarm signal.

[0048] When the aerosol is discharged for a period of time, the temperature of the converter decreases. At this time, the feedback contact inside the aerosol extinguishing device will switch from normally closed to normally open. The DI port of the ARM detection system then determines that the converter is normal and restarts. However, since the previous risk was not checked and the aerosol extinguishing device inside the converter has been used, the reset and restart may cause the converter to arc again, which may lead to a secondary fire.

[0049] Therefore, embodiments of this application provide a fire-fighting device, a converter, a control method, and related apparatus. The fire-fighting device includes a fire-fighting switch and a controller. The first end of the switch is connected to a power supply, and the second end of the switch is connected to the first port of the controller. The first port of the controller is connected to the fire-fighting equipment of the protected device. The controller is used to output a fire alarm signal if the level state of the first port is a preset level state. Upon receiving a fire-fighting equipment signal sent by the fire-fighting equipment, if the electrical parameters of the protected device meet preset conditions, the controller controls the switch to close to maintain the preset level state and outputs a fire alarm signal. The preset conditions are at least one of the following: the current change rate of the protected device is greater than a preset current change rate, the three-phase current balance of the protected device is greater than a preset current balance, the voltage change rate of the protected device is greater than a preset voltage change rate, or the three-phase voltage balance of the protected device is greater than a preset voltage balance.

[0050] Thus, by connecting the first port of the controller to the fire-fighting equipment and the switching device, when the fire-fighting equipment sends a fire-fighting equipment signal, the electrical parameters of the protected equipment can be obtained. Then, when the electrical parameters meet the preset conditions, the switching device is controlled to close. If the level state of the first port is the preset level state, a fire alarm signal is output. Based on the fact that the fire-fighting equipment can protect the protected equipment, if the electrical parameters meet the preset conditions, the switching device can be controlled to close, so that the level state of the first port is the preset level state, thereby continuously outputting a fire alarm signal, further improving the safety of the power electronic equipment.

[0051] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0052] First, the words or technical terms that may appear in the following embodiments will be explained.

[0053] Firefighting equipment refers to equipment or devices used to prevent, control and extinguish fires, such as aerosol fire extinguishing devices, inert gas fire extinguishing devices, carbon dioxide fire extinguishing devices, etc., without being specifically limited here.

[0054] Aerosol fire extinguishing devices are equipment that utilize aerosol technology to extinguish fires. They primarily achieve their extinguishing effect by generating aerosols. The solid extinguishing particles inside rapidly decompose under the action of the aerosol-generating agent, releasing a large amount of highly effective extinguishing substances. These substances can quickly fill the protected space, achieving rapid fire suppression. Aerosol fire extinguishing devices can be classified into two types based on their aerosol generation method: thermal aerosol and cold aerosol.

[0055] Carbon dioxide fire extinguishing systems primarily extinguish fires by removing oxygen, and are suitable for fires involving electrical equipment and flammable liquids. These systems utilize the heat absorbed during the vaporization of liquid carbon dioxide to lower the temperature of the fire and simultaneously dilute the oxygen concentration in the air, thus extinguishing the flames.

[0056] Inert gas fire extinguishing systems primarily consist of a mixture of non-flammable and non-combustible gases such as nitrogen (52%), argon (40%), and carbon dioxide. The most representative example is pyroxene. This mixture is colorless and odorless, and does not decompose upon heating, making it a clean and environmentally friendly extinguishing agent. The extinguishing principle of inert gas fire extinguishing systems is similar to that of carbon dioxide; both rely on diluting the oxygen concentration in the air around the fire to extinguish it. When an inert gas is released into a fire, it rapidly diffuses and fills the entire space, reducing the oxygen content in the air and causing the flames to extinguish due to lack of oxygen.

[0057] The term "power supply" refers to the power source used to provide electrical signals, such as 24VDC, and is not specifically defined here.

[0058] Switching devices refer to controllable devices that have the functions of turning on and off, such as relays, metal-oxide-semiconductor field-effect MOSFET transistors, insulated-gate bipolar transistors (IGBTs), bipolar junction transistors (BJTs), CMOS analog switches, etc., without being specifically limited here.

[0059] A relay is an electrical device that causes a predetermined step change in the controlled quantity in an electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). The working principle of a relay is based on the phenomenon of electromagnetic induction. It mainly consists of an electromagnetic part (including an electromagnetic coil, an iron core, and a spring) and a contact part. When the electromagnetic coil is energized, the generated magnetic field attracts the iron core, causing the contacts to close or open, thereby controlling the on / off state of the circuit.

[0060] A metal-oxide-semiconductor field-effect transistor (MOSFET) is a type of field-effect transistor widely used in analog and digital circuits. A MOSFET's core is a metal-oxide-semiconductor capacitor, and its operating principle involves the accumulation and movement of charge. When a voltage is applied to the gate, it changes the charge distribution on the semiconductor surface, thus forming a conductive channel that controls the current between the source and drain. Based on the channel polarity, MOSFETs can be classified into N-channel (NMOSFET) and P-channel (PMOSFET).

[0061] An Insulated Gate Bipolar Transistor (IGBT) combines the advantages of a power transistor (GTR) and a power MOSFET, exhibiting excellent characteristics and wide applicability. An IGBT turns on by applying a forward gate voltage to form a channel, providing base current to the PNP transistor. Conversely, applying a reverse gate voltage eliminates the channel, allowing reverse base current to flow and turning the IGBT off.

[0062] A bipolar junction transistor (BJT), also known as a bipolar junction transistor or bipolar junction transistor, is a basic electronic component. It consists of two PN junctions with three or more connected regions. The operation of a BJT is based on charge injection and controlled current flow. When a voltage is applied between the emitter and base, a current flows from the emitter to the base; this current is called the base current. Under certain conditions, the base current can cause a larger current to flow from the collector. There are two main types of BJTs: NPN and PNP. In an NPN BJT, both the emitter and collector regions are N-type semiconductors, while the base region is a P-type semiconductor; in a PNP BJT, the opposite is true.

[0063] CMOS analog switches are analog switching circuits based on CMOS (Complementary Metal-Oxide-Semiconductor) technology, typically composed of a combination of pMOS and nMOS transistors. CMOS analog switches utilize the complementary characteristics of pMOS and nMOS transistors, controlling the switch's on / off state by controlling the gate voltage. When the pMOS gate voltage is low, the pMOS is turned on; when the nMOS gate voltage is high, the nMOS is turned on. Because pMOS and nMOS are complementary, CMOS analog switches offer advantages in low power consumption and high noise suppression.

[0064] Arcing refers to an electrical phenomenon that occurs when a switch fails to effectively activate its arc-extinguishing thermal element when the rated short-circuit breaking current exceeds its maximum capacity. Specifically, when the current exceeds the switch's absolute breaking capacity, the arc-extinguishing thermal element at the switch's trip connection may malfunction, leading to the generation of an electric arc. An electric arc is a gas discharge phenomenon; when the voltage exceeds the air's withstand capability, the air ionizes and becomes a conductor, thus generating an arc. Arcs typically bypass insulators and run along their surface, causing damage. For example, the high temperature of the arc can melt or shatter the insulator, potentially leading to a fire.

[0065] A short circuit fault occurs when a phase conductor in an electrical circuit comes into contact with another phase conductor, a phase conductor and a neutral conductor or ground without passing through a load or with very low resistance, causing a sharp increase in current in the electrical circuit. During a short circuit, the rapid increase in current generates enough heat to melt metal conductors and may even ignite surrounding flammable materials, creating an open flame.

[0066] An overload fault refers to a situation where the load on an electrical circuit or equipment exceeds its rated value and cannot be eliminated within a specified time. Prolonged overload operation can lead to increased heat generation in the electrical circuit or equipment; if heat dissipation is poor, the temperature will continue to rise, potentially igniting surrounding flammable materials.

[0067] Poor contact faults refer to the phenomenon where poor contact at the connection points between wires or between wires and electrical equipment in an electrical circuit leads to increased resistance and localized overheating. Specifically, the increased resistance at poor contact points causes more heat to be generated when current flows through them; if this heat cannot be dissipated in time, it can potentially ignite.

[0068] Insulation aging or damage refers to the phenomenon where the insulation layer of electrical circuits or equipment ages or is damaged due to long-term use, environmental factors (such as humidity, high temperature, corrosion, etc.), or external forces. When the insulation layer ages or is damaged, the metal parts of the electrical circuits or equipment may be exposed, increasing the risk of short circuits and leakage, and potentially leading to open flames.

[0069] Equipment failure refers to the fact that when certain power electronic devices, such as transformers and motors, experience internal faults (such as short circuits in windings or insulation damage), they may generate high temperatures or electric arcs, which can then ignite open flames.

[0070] The rate of change of current refers to the ratio of the change in current (the difference between the current values ​​at two moments) to the time taken, usually expressed in A / s (amperes per second).

[0071] Three-phase current balance refers to the degree to which the three-phase currents in a three-phase AC circuit have equal amplitudes and a phase difference of 120 degrees. Ideally, the three-phase currents and voltages are sinusoidal waveforms with no phase or amplitude differences.

[0072] The rate of change of voltage is the ratio of the change in voltage to time, usually expressed in V / s (volts per second).

[0073] Three-phase voltage balance is similar to three-phase current balance; it refers to the degree to which the voltage amplitudes of the three phases are equal and their phases differ by 120 degrees in a three-phase AC circuit.

[0074] The coil of a relay is a key component inside the relay, typically made of copper or aluminum wire wound and encased in insulating material. The coil's primary function is to generate a magnetic field. When energized, the coil produces an electromagnetic field based on the flow of current. This electromagnetic field attracts other parts of the relay (such as the iron core), thus triggering the relay's operation.

[0075] The contacts of a relay are the internal points used to connect or disconnect the circuit. They are typically one or more pairs of silver alloy contacts, and their switching state is changed by controlling the on / off state of the coil. Contacts are one of the most important components of a relay, directly participating in the control and switching process of the circuit. Relay contacts have two states: normally open and normally closed. Normally open contacts are open when the relay coil is not energized, while normally closed contacts are closed. When the relay coil is energized, the state of the contacts changes; normally open contacts close, and normally closed contacts open, thus controlling the circuit.

[0076] A high level refers to a high voltage state as opposed to a low level. In logic levels, the minimum allowable high input level (Vih) for a logic gate to be high is the standard for a high level. When the input level is higher than this threshold, it is generally considered a high level.

[0077] A low level refers to a low voltage state as opposed to a high level. In logic levels, the maximum allowable low input level (Vil) for a logic gate to have a low input is the standard for a low level. When the input level is below this threshold, it is generally considered a low level.

[0078] See Figure 1 This figure is a structural schematic diagram of a fire-fighting device provided in an embodiment of this application, combined with... Figure 1 As shown, the fire-fighting device provided in this application embodiment may include a switching device 101 and a controller 102.

[0079] The first end of the switching device 101 is connected to the power supply, and the second end of the switching device 101 is connected to the first port of the controller 102. The first port of the controller 102 is configured to connect to the fire protection equipment of the protected equipment.

[0080] A controller refers to a device that processes and controls input signals to generate corresponding output signals. It should be noted that, in the embodiments of this application, the controller can be a standalone controller, the controller of the protected device, or the controller of the system in which the protected device resides; no specific limitations are made here.

[0081] It should be understood that if the controller in the fire protection system is a separate controller, it communicates with the controller of the protected equipment and the controller of the system in which the protected equipment is located; if the controller in the fire protection system is the controller of the system in which the protected equipment is located, it communicates with the controller of the protected equipment. In this case, if the controller in the fire protection system is the controller of the protected equipment, hardware costs can be saved.

[0082] Firefighting equipment can be equipped with feedback circuits, which are circuits within the equipment used to send electrical signals to the controller. It should be understood that in order to promptly relay the fire status (normal or fire-prone) of the protected equipment to the controller, a corresponding electrical signal needs to be sent via the feedback circuit. This allows the controller to determine whether the protected equipment is in a normal state or experiencing a fire based on the signal received from the feedback circuit. It should be noted that the feedback circuit of firefighting equipment can be integrated internally or installed as a separate circuit in the same location as the protected equipment for easy detection and signal output.

[0083] As an example, taking an aerosol fire extinguishing device, assuming the preset level is high, the first end of the feedback contact in the aerosol fire extinguishing device is connected to the fire protection power supply, and the second end of the feedback contact is connected to the first port of the controller. The fire protection power supply and the feedback contact constitute a feedback circuit. When the protected equipment is in a normal state (no fire has occurred), the feedback contact is normally open, the first port does not receive a high-level signal, and the controller does not output a fire fault signal. If a fire occurs in the protected equipment at this time, the feedback contact changes from normally open to normally closed, the fire protection power supply sends a high-level signal to the first port through the feedback contact, the level of the first port is high, and the controller outputs a fire alarm signal.

[0084] It should be understood that since the feedback circuit and the circuit containing the switching device are two separate branches, and the output terminals of both branches are connected to the first port, if the level signals of the two circuits are different, it may lead to logic confusion. Furthermore, if the level signal difference between the two circuits is too large, it may generate a large current difference, causing some components to withstand excessive current and become damaged. Therefore, in this embodiment, the power supply connected to the first terminal of the switching device has the same voltage as the power supply connected to the feedback circuit of the fire-fighting equipment.

[0085] The controller 102 is used to output a fire alarm signal if the level state of the first port is a preset level state; when it receives a fire equipment signal sent by the fire equipment, if the electrical parameters of the protected equipment meet the preset conditions, it controls the switching device to close.

[0086] The protected equipment refers to electrical electronic equipment equipped with fire-fighting devices, such as converters, filters, rectifiers, inverters, etc., without specific limitations. Fire-fighting equipment can be installed inside or outside the protected equipment, and can be installed on the top, side, bottom, etc. of the cabinet of the protected equipment, without specific limitations.

[0087] Fire equipment signal refers to the signal sent by fire equipment when it is used. This signal can be provided by the feedback circuit of the fire equipment or by the fire equipment itself; no specific limitation is made here. It should be understood that in the embodiments of this application, when the fire equipment is used, it outputs a fire equipment signal. This signal indicates that a fire has occurred in the protected equipment. When the fire equipment signal is input to the first port of the controller, causing the first port to reach a preset level, the controller outputs a fire alarm signal to achieve the purpose of timely alarm when a fire occurs in the protected equipment. As one possible implementation, the fire equipment signal can be a high-level signal or a low-level signal.

[0088] Electrical parameters refer to key measurement data used to evaluate the protected equipment. They reflect the state of power supply, current, and signal output values ​​and are used to measure the performance of the protected equipment. Electrical parameters can include current, voltage, etc., without specific limitations.

[0089] Preset conditions refer to the conditions that satisfy the closing of the switching device. The preset conditions are at least one of the following: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance.

[0090] To illustrate the advantages of various preset condition combinations, some possible combinations of preset conditions are introduced below:

[0091] (1) The preset condition is: the current change rate of the protected equipment is greater than the preset current change rate. Since the current changes rapidly under conditions such as short circuit and overload, by obtaining the current change rate of the protected equipment, it is possible to quickly respond to abnormal conditions such as short circuit and overload in the protected equipment, so as to cut off the power supply in time to prevent serious consequences such as equipment damage and fire.

[0092] (2) The preset condition is: the voltage change rate of the protected equipment is greater than the preset voltage change rate. Since voltage detection is relatively convenient and quick, the fault or abnormality in the protected equipment can be quickly detected by the voltage change rate.

[0093] (3) The preset condition is that the three-phase current balance of the protected equipment is greater than the preset current balance. Since the three-phase current imbalance may be caused by the fault of the protected equipment, line aging or uneven load, detecting the three-phase current imbalance is beneficial to prevent equipment overheating, efficiency reduction and damage, and also helps to maintain the stability and reliability of the power grid.

[0094] (4) The preset condition is that the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. Similar to the three-phase current balance, the three-phase voltage imbalance may also lead to equipment performance degradation and damage. Therefore, detecting the three-phase voltage balance can help maintain the normal operation of the protected equipment and the stability of the power grid.

[0095] (5) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate and the three-phase current balance of the protected equipment is greater than the preset current balance. By considering both the current change rate and the three-phase current balance, the electrical condition of the protected equipment can be assessed more comprehensively, providing more comprehensive protection. The combined use of the two preset conditions can mutually verify each other, improving the accuracy and reliability of the protection.

[0096] (6) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate and the voltage change rate of the protected equipment is greater than the preset voltage change rate. By considering both the current change rate and the voltage change rate at the same time, the current change rate can accurately reflect the status of the protected equipment, and the voltage change rate can be quickly obtained to determine whether the protected equipment has failed, thereby improving the accuracy and reliability of the protection.

[0097] (7) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate and the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. It should be understood that the combination of the two preset conditions can verify each other and improve the accuracy and reliability of the protection.

[0098] (8) The preset conditions are: the three-phase current balance of the protected equipment is greater than the preset current balance and the voltage change rate of the protected equipment is greater than the preset voltage change rate. It should be understood that the combination of the two preset conditions can verify each other and improve the accuracy and reliability of the protection.

[0099] (9) The preset conditions are: the three-phase current balance of the protected equipment is greater than the preset current balance and the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. It should be understood that the combination of the two preset conditions can verify each other and improve the accuracy and reliability of the protection.

[0100] (10) The preset conditions are: the voltage change rate of the protected equipment is greater than the preset voltage change rate and the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. Simultaneous detection of the voltage change rate and the three-phase voltage balance can more effectively protect the equipment from the effects of voltage fluctuations and imbalances. The combination of the two preset conditions helps to maintain the protected equipment in a stable voltage environment and improves the stability and reliability of the protected equipment.

[0101] (11) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, and the voltage change rate of the protected equipment is greater than the preset voltage change rate. By judging through the three preset conditions, it can be applied to protected equipment with different characteristics and operating environments, and can flexibly cope with various complex electrical protection needs.

[0102] (12) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, and the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. By judging through the three preset conditions, it can be applied to protected equipment with different characteristics and operating environments, and can flexibly cope with various complex electrical protection needs.

[0103] (13) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate, the voltage change rate of the protected equipment is greater than the preset voltage change rate, and the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. By judging through the three preset conditions, it can be applied to protected equipment with different characteristics and operating environments, and can flexibly cope with various complex electrical protection needs.

[0104] (14) The preset conditions are: the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. By judging through the three preset conditions, it can be applied to protected equipment with different characteristics and operating environments, and can flexibly cope with various complex electrical protection needs.

[0105] (15) The preset conditions are: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance. It should be understood that by simultaneously detecting multiple electrical parameters (such as current change rate, three-phase current balance, voltage change rate and three-phase voltage balance), the operating status and safety of the protected equipment can be more comprehensively evaluated, a more complex and refined protection logic can be constructed, a higher level of protection can be provided, and the protected equipment can be protected in a timely and effective manner under various abnormal conditions.

[0106] The preset current change rate refers to the maximum allowable current change rate of the protected equipment under normal operating conditions. In one possible implementation, the preset current change rate is within a preset period t, and the rated current change rate is within ±x% (for example, x% is 50%), but it is not limited to this and is not specifically limited here.

[0107] The preset current balance refers to the maximum allowable imbalance of the protected equipment under normal operating conditions. In one possible implementation, according to the standard, the preset current balance range is that the load imbalance rate shall not exceed ±20%. The load imbalance rate refers to the percentage difference between the maximum and minimum current values ​​in the three-phase current.

[0108] The preset voltage change rate refers to the maximum voltage change rate allowed for the protected equipment under normal operating conditions. In one possible implementation, the preset voltage change rate of a single phase does not exceed the rated ±x% (for example, x% is 50%), but it is not limited to this and is not specifically limited here.

[0109] The preset voltage balance refers to the maximum allowable imbalance of the protected equipment under normal operating conditions. It should be noted that in this embodiment, the voltage balance can be represented by the amplitude or frequency of the three-phase voltages. For example, the preset voltage balance may be that the amplitudes of the three-phase voltages should be equal and their phases should differ by 120 degrees, or the preset voltage balance may be the rated frequency ± x% (10%). If the amplitude difference of the three-phase voltages is too large, the phase relationship is incorrect, or the frequency exceeds the rated frequency, it may indicate a fault or abnormality in the power system.

[0110] It should be noted that, under normal operating conditions, the protected equipment's current change rate is less than or equal to the preset current change rate, the protected equipment's three-phase current balance is less than or equal to the preset current balance, the protected equipment's voltage change rate is less than or equal to the preset voltage change rate, and the protected equipment's three-phase voltage balance is less than or equal to the preset voltage balance.

[0111] A fire alarm signal is a signal used to indicate that a fire has occurred in the protected equipment. In one possible implementation, the controller can output the fire alarm signal to the host computer so that the host computer does not restart the protected equipment; in another possible implementation, the controller can decide not to restart the protected equipment based on the output fire alarm signal, and no specific limitation is made here.

[0112] Level states are used to describe the voltage level or the high / low state of a signal in a circuit. In digital circuits, level states are usually divided into two types: high level and low level, corresponding to logic "1" and "0" respectively.

[0113] The preset level state refers to the level state that corresponds to the output fire alarm signal. The determination condition of this preset level state depends on the level signal output by the fire protection equipment. For example, a high-level signal output by the fire protection equipment indicates that a fire has occurred in the protected equipment. As one possible implementation, the preset level state is high. In this case, the controller 102 is used to output a fire alarm signal if the level state received at the first port is high.

[0114] It should be noted that a high-level signal usually indicates a higher voltage level, which may make the signal more stable in some cases and reduce false triggering caused by voltage fluctuations or noise interference. Therefore, in this embodiment, the preset level state can be a high level, that is, when the level signal of the first port is a high level, a fire alarm signal is output.

[0115] In some other possible implementations, the preset level state can also be a low-level signal. Assuming the feedback circuit of the fire-fighting equipment includes a one-time contact (e.g., a contact that melts when exposed to high temperatures), the feedback circuit continuously outputs a high-level signal when the protected equipment is operating normally. If a fire occurs in the protected equipment, the one-time contact melts due to high temperature, and the feedback circuit outputs no level signal (which can also be understood as a low-level signal). The absence of a level output from the fire-fighting equipment's feedback circuit indicates a fire in the protected equipment. Therefore, the preset level state can be no level. In this case, the controller 102 outputs a fire alarm signal if the level state of the first port is no level.

[0116] It should be noted that, in the embodiments of this application, the electrical parameters of the protected equipment can be received at any time, such as continuously receiving electrical parameters before receiving a fire fault signal, periodically receiving electrical parameters before receiving a fire fault signal, obtaining electrical parameters when receiving a fire fault signal, or obtaining electrical parameters after receiving a fire fault signal, etc. The timing of receiving electrical parameters is not limited here.

[0117] It should also be noted that, in the embodiments of this application, the timing for determining whether the electrical parameters meet the preset conditions can be at the time of receiving the fire equipment signal or at any time after receiving the fire equipment signal, so the timing for determining the electrical parameters is not limited.

[0118] It should be understood that there are various reasons why protected equipment may catch fire, such as arcing, short circuits, overloads, poor contact, insulation aging or damage, equipment malfunctions, etc. If the feedback circuit of the fire-fighting equipment no longer outputs a signal that meets the preset level due to the extinguishing of an open flame or a drop in temperature, the controller will consider the protected equipment to have returned to normal and then restart it. However, since the previous risk was not assessed and the fire-fighting equipment installed on the protected equipment has already been used, a reset and restart may cause the protected equipment to experience the aforementioned fault again, which could potentially lead to a secondary fire.

[0119] Therefore, in this embodiment, when the switching device is open, the electrical parameters of the protected equipment are acquired. Based on these electrical parameters, the state of the protected equipment is reflected, and then the switching device is controlled to close when the electrical parameters meet preset conditions. Since the first end of the switching device is connected to the power supply and the second end is connected to the first port of the controller, if the switching device is closed, the power supply will provide a level signal that conforms to the preset level state to the first port, thereby causing the controller to output a fire fault signal.

[0120] The fire protection device provided in this application embodiment has a controller that acquires the electrical parameters of the protected equipment when the switching device is open. When the electrical parameters meet the preset conditions, it can be assumed that the protected equipment still cannot start. By controlling the switching device to close, the power supply provides a level signal to the first port. At this time, if the feedback circuit of the fire protection device no longer sends a level signal, the power supply can still make the level state of the first port a preset level state, and continuously output a fire alarm signal, so as to prevent the protected equipment from restarting before the fault is eliminated, and further improve the safety of the power electronic equipment.

[0121] Based on the fire-fighting device provided in the above embodiments, in one possible implementation, before the switching device is closed, the controller is also used to identify that the level state of the first port is a preset level state, identify that the fire-fighting equipment has triggered fire extinguishing, and output a fire alarm signal.

[0122] It should be understood that when a fire occurs in the protected equipment, the fire-fighting equipment will extinguish the fire on the one hand, and send an electrical signal through the feedback circuit on the other hand, so that the electrical level of the first port is at the preset level. At this time, the controller can recognize that the electrical level of the first port is at the preset level and output a fire alarm signal to protect the protected equipment.

[0123] Based on the fire-fighting device provided in the above embodiments, combined with Figure 2a As shown, in one possible implementation, in Figure 1 Based on this, the fire-fighting equipment includes a feedback circuit. The first end of the feedback circuit is connected to the fire-fighting power supply, and the second end of the feedback circuit is connected to the first port of the controller 102. The switching device 101 is a relay, which includes a contact 2011 and a coil 2012. The first end of the contact 2011 is connected to the first power supply, and the second end of the contact 2011 is connected to the first port of the controller 102. The first end of the coil 2012 is connected to the second power supply, and the second end of the coil 2012 is connected to the second port of the controller 102.

[0124] In the embodiments of this application, Figure 2a The voltage of the fire-fighting power supply, the voltage of the first power supply, and the voltage of the second power supply are the same, for example. Figure 2a The image shows that the voltage of the fire protection power supply, the voltage of the first power supply, and the voltage of the second power supply are all 25V.

[0125] In another possible implementation, to avoid logic errors caused by voltage differences, such as Figure 2b As shown, the voltage of the fire protection power supply is the same as that of the first power supply, while the voltage of the second power supply can be different from that of the first power supply. For example, [example shown]. Figure 2b As shown, the voltage of the fire protection power supply and the voltage of the first power supply are 25V, and the voltage of the second power supply is 30V.

[0126] It should be noted that in another possible implementation, see [link to relevant documentation]. Figure 2c If the voltage of the fire-fighting power supply, the voltage of the first power supply, and the voltage of the second power supply are all the same, then the first power supply and the second power supply are the same power supply X.

[0127] In another possible implementation, see Figure 2c When the voltage of the fire-fighting power supply, the voltage of the first power supply, and the voltage of the second power supply are all the same, the power supply X is the same.

[0128] Combination Figures 2a to 2d As shown, it should be understood that the voltage of the first power supply and the voltage of the second power supply can be the same or different; the voltage of the first power supply and the voltage of the fire protection power supply must be the same. If the voltage of the first power supply and the voltage of the fire protection power supply are different, a voltage difference will exist between them, which may lead to a logic conflict, preventing the controller from correctly identifying the signal status.

[0129] It should be noted that, in the embodiments of this application, the first power supply, the second power supply, and the fire protection power supply can be the same power supply or different power supplies.

[0130] If the first power supply, the second power supply, and the fire protection power supply are all different power supplies, the reliability of the three power supplies can be guaranteed, and the problem of switch failure caused by power supply failure when the three power supplies share the same power supply can be avoided.

[0131] If the first and second power supplies are the same power source, and the fire protection power supply is a different power source, or if the first and fire protection power supplies are the same power source, and the second power supply is a different power source, this ensures the reliability of all three power supplies and avoids the problem of switch failure caused by power supply failure when all three power supplies share the same power source. Furthermore, since the output voltage of the power supply can fluctuate, if the three power supplies use different power sources, voltage fluctuations in one power source may be transmitted to the other through the circuit, affecting the stability of the entire system. Therefore, to improve system stability, while ensuring power supply reliability, the first and second power supplies can be the same power source, or the first and fire protection power supplies can be the same power source, further enhancing system stability.

[0132] If the first power supply, the second power supply, and the fire protection power supply are the same power source, voltage fluctuations caused by using different power sources can be avoided, reducing risk points and further improving the stability of the entire system.

[0133] The controller 102 is used to control the level state of the second port to close the contacts when the electrical parameters of the protected device meet the preset conditions.

[0134] It should be understood that contacts are divided into normally open contacts and normally closed contacts. If the contact is normally open and the electrical parameters meet the preset conditions, the controller 102 can control the level of the second port to be high, so that the coil is energized, thereby changing the contact from the normally open state to the normally closed state. If the contact is normally closed and the electrical parameters meet the preset conditions, the controller 102 can control the level of the second port to be 0, so that the coil is de-energized, thereby changing the contact from the normally open state to the normally closed state.

[0135] It should be understood that relays are well-suited for handling high-power loads, such as high voltage and high current, making them ideal for use as switching devices in fire protection systems. Furthermore, their relatively simple mechanical structure facilitates maintenance and replacement. In the event of a malfunction, users can quickly locate and repair the problem, reducing maintenance costs and time.

[0136] Based on the fire protection device provided in the above embodiments, if the switching device is open and the controller outputs a fire alarm signal, it can be considered that the protected equipment is not in a fault state. As a possible implementation, the controller 102 is also used to output a start signal when the switching device is open and the level state of the first port is not a preset level state.

[0137] The start signal refers to the signal used to control the restart of the protected device.

[0138] It should be noted that the controller 102 can control the protected device to restart directly after the level state of the first port is not at the preset level state; alternatively, it can receive a software reset signal sent by the host computer to restart the protected device when the level state of the first port is not at the preset level state. No specific limitation is made here. The software reset signal refers to the signal sent to the controller to control the restart of the protected device.

[0139] It should be understood that if the switching device is open and the controller outputs a fire alarm signal, it can be reset by software to improve the timeliness of the protected equipment's resumption of operation.

[0140] Further research revealed that if the electrical parameters of the protected equipment meet the preset conditions, the controller will control the switching device to close. At this time, it can be assumed that the protected equipment is faulty (such as arcing). After the switching device is closed, the level of the first port of the controller will remain at the preset level. At this time, the controller will continuously output a fire alarm signal to indicate that the protected equipment is in a faulty state.

[0141] However, when the protected device returns to normal, it can start normally, but because the switching device remains closed, the protected device cannot be restarted.

[0142] Therefore, based on the fire-fighting device provided in the above embodiments, as a possible implementation, the controller 102 can also be used to acquire the hardware reset signal sent by the protected equipment after the control switch is closed; and control the switch to open according to the hardware reset signal.

[0143] A hardware reset signal is a signal sent by the protected device. The hardware reset signal is derived from the protected device's detection module. The hardware reset signal is used to indicate that the switching device is open.

[0144] It should be understood that the protected equipment is generally equipped with a detection module, which is used to detect whether the internal workings of the protected equipment are normal. Therefore, after the switching device is closed, the detection module of the protected equipment can be used to determine whether the protected equipment has returned to normal. When the detection module detects that the protected equipment is normal, a hardware reset signal is sent to the controller so that the controller can control the switching device to open.

[0145] It should be noted that the protected equipment may experience both true and false arcing. True arcing refers to a genuine arcing fault in the protected equipment that triggers the fire suppression system. False arcing (such as short circuits, fire suppression system malfunctions, or fires caused by non-fault reasons) refers to a situation where the protected equipment does not actually arc, but the fire suppression system is triggered. If the protected equipment experiences arcing (true or false), the detection module will perform internal checks. If the detection result indicates a fault in the protected equipment (such as true arcing, short circuits, etc.), the detection module will not send a hardware reset signal to the controller 102, and the controller 102 will not control the protected equipment to restart. If the detection result indicates that the protected equipment does not have a fault (including cases where a fault existed initially but then disappeared), the detection module can send a hardware reset signal to the controller 102, allowing the controller 102 to control the protected equipment to restart.

[0146] In one possible implementation, the detection module of the protected device can automatically perform detection after the protected device stops due to a fault, or it can perform detection after the protected device returns to normal, or it can perform detection by receiving detection commands sent by the controller. No specific limitations are made here.

[0147] The detection command refers to the instruction sent by the controller to the detection module of the protected device, used to control the detection module to perform detection on the protected device. When the controller 102 is not the controller of the protected device, the detection command can be sent by the controller 102 to the controller of the protected device, and then sent by the controller of the protected device to the detection module; the controller 102 can also send the detection command directly to the detection module, without specific limitations.

[0148] The controller 102 can acquire a hardware reset signal sent by the protected device (detection module or controller of the protected device) after the switching device is closed; or send a detection command to the detection module of the protected device and acquire a hardware reset signal, without being specifically limited here.

[0149] In this embodiment, after the switching device is closed, regardless of whether the feedback circuit of the fire protection equipment outputs a level signal, the power supply will continuously output a level signal that conforms to the preset level state, so that the protected equipment is always in a fire fault state (the controller continuously outputs a fire alarm signal). At this time, the detection module of the protected equipment can be further linked to determine whether the protected equipment is normal. When the detection result indicates that the protected equipment is normal, a hardware reset signal is sent to the controller to disconnect the switching device. In this way, the operational risks caused by software reset after the protected equipment fails can be avoided. This avoids the operational risks of software reset operation after a real arc in the converter cabinet, thus improving the safety of the protected equipment.

[0150] Based on the fire-fighting device provided in the above embodiments, the fire-fighting equipment may output a fire-fighting equipment signal when the fire-fighting equipment is used (or can be understood as working), or it may output a fire-fighting equipment signal due to aging, malfunction, or other reasons. If the fire-fighting equipment signal is output due to aging, malfunction, or other reasons, the fire-fighting equipment signal will be continuously output, and the corresponding controller will continuously output a fire alarm signal. However, the protected equipment has not experienced a fire or the fire has been extinguished, and the protected equipment is normal and without fault. Consequently, the continuously output fire alarm signal prevents the protected equipment from restarting.

[0151] To address this issue, in one possible implementation, if the fire alarm signal does not disappear after a preset time and the electrical parameters of the protected equipment do not meet the preset conditions, the controller can also acquire the detection reset signal sent by the protected equipment and output a start signal based on the detection reset signal.

[0152] The detection reset signal is a signal used to instruct the controller to force a start. This detection reset signal can be output by the detection module of the protected equipment or by the temperature detection module of the protected equipment.

[0153] It should be understood that when a fire alarm signal is continuously output and electrical parameters do not meet preset conditions, the temperature of the protected equipment can be detected to determine whether the protected equipment is in a fire state. The temperature of the protected equipment can be obtained through a detection module or a temperature detection module. A detection module is a module installed on the protected equipment itself, while a temperature detection module refers to a module installed on the protected equipment to detect its temperature, such as a thermistor or temperature sensor, etc., without specific limitations here.

[0154] In this implementation, if the fire alarm signal does not disappear after a preset time and the electrical parameters of the protected equipment do not meet the preset conditions, a detection reset signal is further received. This allows the protected equipment to be restarted based on the start signal, avoiding the problem of the protected equipment being unable to restart due to the fire alarm signal not disappearing for a long time, thus improving the stability and reliability of the system.

[0155] Based on the fire-fighting device provided in the above embodiments, see [link / reference]. Figure 3 This figure is a structural schematic diagram of another fire-fighting device provided in an embodiment of this application. (Combined with...) Figure 3 As shown, the fire-fighting device provided in this application embodiment may include a switching device 101 and a controller 102. The fire-fighting equipment may include a thermal wire 301, an aerosol 302, and a temperature-sensitive normally open contact 303. The thermal wire 301 is connected to the aerosol 302. The first end of the temperature-sensitive normally open contact 303 is connected to the fire-fighting power supply, and the second end of the temperature-sensitive normally open contact 303 is connected to the first port DI1 of the controller 102. The switching device 101 is a relay 201. The relay 201 includes a contact 2011 and a coil 2012. The first end of the contact 2011 is connected to a first power supply, and the second end of the contact 2011 is connected to the first port DI1 of the controller 102. The first end of the coil 2012 is connected to a second power supply, and the second end of the coil 2012 is connected to the second port DO1 of the controller 102.

[0156] It should be noted that the normally open temperature sensor contact 303 and the fire protection power supply form a feedback circuit, which is connected to the first port of the controller.

[0157] It should be noted that the components that are the same as those in the embodiments of the present application are referenced in the accompanying drawings of the components in the embodiments of the above embodiments. For related explanations, please refer to the explanations of the components in the embodiments of the above embodiments, which will not be repeated here.

[0158] It should be noted that in the embodiments of this application, the voltage of the fire-fighting power supply, the first power supply, and the second power supply is the same, and the voltage can be 24VDC.

[0159] It should be understood that when a fire occurs in the protected equipment, the thermal wire 301 will burn after reaching a preset temperature A (the temperature at which the thermal wire burns) at any point; after the thermal wire 301 burns into the aerosol 302, it will trigger the aerosol 302 to be ejected; at the same time, the normally open temperature sensor 303 will change from a normally open state to a normally closed state after exceeding a preset temperature B (the temperature at which the normally open temperature sensor closes); the fire protection power supply will output a high-level signal to the first port DI1 of the controller 102; after the controller 102 detects that the level of DI1 is high, the controller 102 will output a fire alarm signal.

[0160] Furthermore, after outputting the fire alarm signal (before the switch device 101 is closed), the controller 102 acquires the electrical parameters of the protected equipment; when the electrical parameters meet the preset conditions, the controller 102 controls the second port DO1 to 0V, the coil 2012 is de-energized, and the contact 2011 is closed; when the electrical parameters do not meet the preset conditions, the controller 102 controls the second port DO1 to output a high level, the coil 2012 is energized, and the contact 2011 is opened.

[0161] When the fire-fighting equipment lowers the temperature of the protected equipment and extinguishes the open flame, the normally open temperature sensor 303 changes from a normally closed state to a normally open state after the temperature drops below the preset temperature B. The fire-fighting power supply stops sending a high-level signal to the first port DI1 of the controller 102. If the switch 101 is open, the fire-fighting power supply stops sending a high-level signal to the first port DI1 of the controller 102. The controller 102 receives a software reset signal sent by the host computer. At this time, the fire fault signal can be cleared based on the software reset signal, and the protected equipment can be restarted. If the switch 101 is closed, the fire-fighting power supply stops sending a high-level signal to the first port DI1 of the controller 102, the first power supply sends a high-level signal to the first port DI1, and the controller 102 receives a hardware reset signal sent by the detection module of the protected equipment, so that the switch 101 is open, the controller 102 stops outputting the fire fault signal, clears the fire fault signal, and controls the protected equipment to restart.

[0162] The fire protection device provided in this application embodiment, if the level state of the first port of the controller is a preset level state (the level of the first port is high level), will report a fire alarm signal and shut down for protection; further, it will determine whether the electrical parameters of the protected equipment meet preset conditions. If the preset conditions are met, it will not be allowed to reset by software reset signal, and it will need to further link the detection module of the protected equipment to detect the protected equipment. If the protected equipment is in a normal state, the controller can control the switching device to disconnect by hardware reset signal and clear the fire fault signal to ensure that the equipment inspection and recovery are completed and improve the safety of power electronic equipment.

[0163] Based on the fire-fighting device provided in the above embodiments, see [link / reference]. Figure 4 This figure is a schematic flowchart of a control method for a fire-fighting device provided in an embodiment of this application. The fire-fighting device in this embodiment includes fire-fighting equipment, a switching device, and a controller; the first end of the switching device is connected to a power supply, the second end of the switching device is connected to the first port of the controller, and the feedback circuit in the fire-fighting equipment is connected to the first port of the controller;

[0164] The control method provided in this application embodiment may include:

[0165] S401: Obtain the electrical parameters of the protected equipment based on the fire equipment signal received from the fire equipment.

[0166] S402: If the electrical parameters of the protected equipment meet the preset conditions, the control switch will be closed.

[0167] After the switching device is closed, the power supply connected to the switching device outputs a preset level signal to the first port.

[0168] S403: If the electrical parameters of the protected equipment do not meet the preset conditions, the control switch will disconnect.

[0169] If the voltage level of the first port is a preset voltage level, a fire alarm signal is output.

[0170] Among them, the preset conditions are at least one of the following: the current change rate of the protected equipment is greater than the preset current change rate, the three-phase current balance of the protected equipment is greater than the preset current balance, the voltage change rate of the protected equipment is greater than the preset voltage change rate, or the three-phase voltage balance of the protected equipment is greater than the preset voltage balance.

[0171] As an example, before the switching device is closed, the method also includes: identifying the level state of the first port as a preset level state and outputting a fire alarm signal.

[0172] As an example, the default level is high.

[0173] As an example, the switching device is a relay, which includes contacts and a coil. A first end of the contacts is connected to a first power supply, and a second end of the contacts is connected to a first port of the controller. A first end of the coil is connected to a second power supply, and a second end of the coil is connected to a second port of the controller.

[0174] If the electrical parameters of the protected equipment meet the preset conditions, the control switch will close, including:

[0175] When the electrical parameters of the protected device meet the preset conditions, the level state of the second port is controlled to close the contacts.

[0176] As an example, it also includes:

[0177] After the control switch is closed, the hardware reset signal sent by the protected device is acquired;

[0178] The switching device is turned off based on the hardware reset signal.

[0179] As an example, after outputting the fire alarm signal, the method further includes: outputting a start signal to restart the protected equipment when the switching device is open and the level state of the first port is not a preset level state.

[0180] The control method of the fire-fighting device provided in this application embodiment has the same beneficial effects as the fire-fighting device provided in the above embodiments, and will not be repeated here.

[0181] Based on the fire-fighting device provided in the above embodiments, see [link / reference]. Figure 5 The figure is a flowchart illustrating another control method for a fire-fighting device provided in an embodiment of this application.

[0182] Combination Figure 5 As shown, the control method for the fire-fighting device provided in this application embodiment may include:

[0183] S501: Monitor the protected equipment.

[0184] In this embodiment, electrical parameters, temperature parameters, etc., of the protected equipment can be detected, and no specific limitation is made here. The method of monitoring the parameters (electrical parameters, temperature parameters, etc.) of the protected equipment can be continuous monitoring; it can also be periodic monitoring of the parameters of the protected equipment; or it can be stopping the monitoring after conditional judgment of the parameters (such as whether the electrical parameters meet preset conditions), and resuming monitoring after the protected equipment is restarted. The monitoring method is not limited here.

[0185] S502: Determine whether the level state of the first port is the preset level state. If yes, proceed to step S503; otherwise, proceed to step S501.

[0186] S503: Outputs fire alarm signal to control the shutdown of protected equipment.

[0187] S504: Check whether the electrical parameters of the protected equipment meet the preset conditions. If yes, proceed to step S505; otherwise, proceed to step S508.

[0188] S505: Controls the closing of the switching device and outputs a preset level signal.

[0189] Since the circuit containing the switching device continuously outputs a preset level signal, a fire alarm signal will be continuously output based on the continuously output preset level signal, and the protected equipment will be shut down indefinitely.

[0190] S506: Outputs fire alarm signal and waits for hardware reset signal.

[0191] After outputting a fire alarm signal, it needs to wait for a hardware reset signal sent by the protected device. The detection module of the protected device will only output a hardware reset signal when it detects that the protected device is normal and without fault; otherwise, it will not output a hardware reset signal.

[0192] S507: Determine whether a hardware reset signal has been received. If yes, proceed to step S508; otherwise, proceed to step S506.

[0193] S508: Control switch device is disconnected, waiting for software reset signal.

[0194] S509: Determine whether a software reset signal has been received. If yes, proceed to step S510; otherwise, proceed to step S508.

[0195] S510: Clear fire alarm messages and restart the protected equipment.

[0196] The control method of the fire-fighting device provided in this application embodiment has the same beneficial effects as the fire-fighting device provided in the above embodiments, and will not be repeated here.

[0197] Furthermore, this application also provides a converter, which includes a controller, a plurality of parallel converter units, and a fire-fighting device as described in any of the above embodiments, wherein the controller is connected to each of the converter units.

[0198] It should be noted that the converter provided in this application embodiment can be a wind power converter, an energy storage converter, a hydropower converter or other types of converter, and no specific limitation is made here.

[0199] This application embodiment also provides a control device, combined with Figure 6 As shown, the control device may include a memory 611 and a processor 612. The processor 612 may be connected to the protected equipment, which is equipped with fire-fighting equipment. Figure 6 As shown, the memory can be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disks, removable disks, etc.

[0200] The memory 611 can store computer instructions. When the computer instructions stored in the memory 611 are executed by the processor 612, the processor 612 can be used to execute the control method of the fire-fighting device. The memory 611 can also store data, such as preset level states, preset conditions, and other information involved in the above embodiments.

[0201] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).

[0202] This application also provides a readable storage medium for storing the methods provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0203] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0204] In the embodiments of this application, the terms "first" and "second" (if they exist) are used only as name identifiers and do not represent the order of first and second.

[0205] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fire fighting device, characterized in that The application relates to a fire protection device and a controller thereof. The controller is configured to output a fire alarm signal if the level state of the first port is a preset level state. The controller is configured to control the switch device to close if the electrical parameter of the protected device meets a preset condition after receiving a fire device signal sent by the fire device. The preset condition is at least one of the following: the current change rate of the protected device is greater than a preset current change rate, the three-phase current balance degree of the protected device is greater than a preset current balance degree, the voltage change rate of the protected device is greater than a preset voltage change rate, or the three-phase voltage balance degree of the protected device is greater than a preset voltage balance degree.

2. The fire fighting device of claim 1, wherein The switch device is a relay, the relay comprises contacts and a coil, a first end of the contacts is connected to a first power supply, a second end of the contacts is connected to the first port of the controller, a first end of the coil is connected to a second power supply, and a second end of the coil is connected to a second port of the controller; the first power supply and the second power supply are the same power supply or different power supplies. The controller is configured to control the level state of the second port to make the contacts close when the electrical parameter meets the preset condition.

3. The fire fighting device of claim 1, wherein The controller is further configured to acquire a hardware reset signal sent by the protected device after controlling the switch device to close, and control the switch device to open according to the hardware reset signal.

4. Fire fighting device according to any of claims 1-3, characterized in that The fire device comprises a temperature-sensitive normally open contact, a first end of the temperature-sensitive normally open contact is connected to a fire protection power supply, and a second end of the temperature-sensitive normally open contact is connected to the first port of the controller.

5. The fire fighting device of claim 4, wherein The fire protection power supply and the power supply are the same power supply, or the fire protection power supply and the power supply are different power supplies.

6. The fire extinguishing device of claim 1, wherein After outputting the fire alarm signal, the controller is further configured to output a start signal when the switch device is open and the level state of the first port is not the preset level state.

7. A fire extinguishing device according to any one of claims 1-6, characterised in that The controller is further configured to acquire a detection reset signal sent by the protected device if the fire alarm signal does not disappear after a preset time length and the electrical parameter of the protected device does not meet the preset condition, and output a start signal according to the detection reset signal.

8. A control method of a fire extinguishing apparatus, characterized by, The application relates to a fire protection device and a controller thereof. The controller is configured to output a fire alarm signal if the level state of the first port is a preset level state. The controller is configured to control the switch device to close if the electrical parameter of the protected device meets a preset condition after receiving a fire device signal sent by the fire device. The fire device signal indicates that the fire device works, and the electrical parameter indicates the electrical parameter of the protected device when the fire device works. The preset condition is at least one of the following: a current change rate of the protected device is greater than a preset current change rate, a three-phase current balance degree of the protected device is greater than a preset current balance degree, a voltage change rate of the protected device is greater than a preset voltage change rate, or a three-phase voltage balance degree of the protected device is greater than a preset voltage balance degree.

9. The control method according to claim 8, characterized by, The switch device is a relay, and the relay includes a contact and a coil. A first end of the contact is connected to a first power supply, a second end of the contact is connected to a first port of the controller, a first end of the coil is connected to a second power supply, and a second end of the coil is connected to a second port of the controller. The method further includes: When the electrical parameter of the protected device meets the preset condition, the second port is controlled to have a level state.

10. The control method according to claim 8, characterized by After the switch device is controlled to be closed, the method further includes: A hardware reset signal sent by the protected device is acquired. The switch device is controlled to be disconnected according to the hardware reset signal.

11. A current transformer, characterized by The converter includes a controller, a plurality of parallel-connected current conversion units, and the fire-fighting device according to any one of claims 1-7, and the controller is connected to each of the current conversion units.

12. A control device characterized by comprising: The fire-fighting device includes a processor and a memory. The processor is connected to the controller. The memory is used to store programs, instructions, or codes. The processor is used to execute the programs, instructions, or codes in the memory to complete the control method of the fire-fighting device according to any one of claims 8-10.

13. A computer-readable storage medium, characterized in that, A computer program is stored, and the computer program is loaded by a processor to execute the control method of the fire-fighting device according to any one of claims 8-10.

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