Chemical undisturbed power supply device based on double PT logic switching

Abstract

The utility model discloses a chemical undisturbed power supply device based on double PT logic switching, which comprises an undisturbed switching device, a first PT and a second PT, an MCU control module is integrated in the undisturbed switching device, and the MCU control module is connected with a logic control module and a double-path analog quantity input module. The first PT and the second PT are respectively installed at different positions of the same bus, and the two-way analog quantity input module is respectively connected with the secondary side output of the first PT and the secondary side output of the second PT; and the logic control module is used for receiving signals of the first PT and the second PT, and when the two paths of signals are both lower than a setting value, switching is triggered. According to the utility model, the two-way analog input module and the logic control module are arranged in the undisturbed switching device, and the first PT and the second PT are connected in series on each section of bus; a double-channel analog quantity input module of the undisturbed switching device is connected with secondary side outputs of the first PT and the second PT respectively, and a logic control module receives signals of the first PT and the second PT.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, specifically a chemical non-disruptive power supply device based on dual PT logic switching. Background Technology

[0002] The undisturbed device of the 10kV system in the chemical branch currently switches to acquire single PT signals. To ensure the reliability of operation, the undisturbed device will only start the logic after all voltage and current signals have disappeared, in order to avoid the risk of false tripping caused by PT fuse blowing.

[0003] In the prior art, the invention patent with publication number CN105515172A discloses a method for judging the power supply switching of a pressure transmitter. The input sensor signal is preprocessed by a preamplifier circuit and then processed by a secondary signal processing circuit to generate a digital signal that is sent to a microcontroller. The pressure transmitter is powered by a first power supply. At the same time, the microcontroller communicates bidirectionally with a remote terminal with communication permissions through a first interface and displays the sensor signal processing status on a first flexible display device. The pressure transmitter also has a local backup storage subsystem for storage backup and power backup. The backup power supply and the conventional power supply can be switched.

[0004] Although the power switching judgment method provided by the above patent is for switching power, it is not applicable to power supply in the chemical industry. Power supply in the chemical industry needs to ensure the stability of the power supply system. In reality, after the power supply side loses power, it takes a certain amount of time for the current signal to drop and disappear (the disappearance of current and the program judgment need time to be executed). This causes the disturbance-free switching device to fail to act in time, which in turn causes some equipment to trip due to low voltage, or even the interlocking system to stop. Utility Model Content

[0005] The purpose of this invention is to provide a chemical industry non-disruptive power supply device based on dual PT logic switching, which aims to improve the problem that existing non-disruptive switching devices cannot react and switch quickly, affecting the stable power supply of chemical systems.

[0006] This utility model is implemented as follows:

[0007] A disturbance-free power supply device for chemical plants based on dual-PT logic switching includes a disturbance-free switching device, a first PT, and a second PT. The disturbance-free switching device integrates an MCU control module, which is connected to a logic control module and a dual-channel analog input module. The first PT and the second PT are installed at different locations on the same busbar. The dual-channel analog input module is connected to the secondary outputs of the first PT and the second PT, respectively. The logic control module receives signals from the first PT and the second PT, and triggers switching when both signals are below a set value.

[0008] Preferably, the logic control module includes an analog input unit, a signal processing unit, a logic operation unit, a control output unit, and a human-machine interaction unit; the analog input unit is used to receive the voltage signals output by the first PT and the second PT and complete the analog-to-digital conversion; the signal processing unit is used to filter, calculate the effective value, and compare the amplitude of the received voltage signals; the logic operation unit is used to perform dual PT logic switching judgment; the control output unit is used to send opening and closing commands to the circuit breaker; and the human-machine interaction unit is used for parameter setting, status display, and fault query.

[0009] Preferably, the disturbance-free switching device includes a body, a heat dissipation fin is installed at the rear opening of the body, a through hole is provided on the side of the body along the rear of the heat dissipation fin, a flow guide is installed at the rear opening of the body, a corrugated hose is provided at the rear end of the flow guide, and a cooling fan is connected to the end of the corrugated hose.

[0010] Preferably, the front of the machine body is provided with a control panel, the front sides of the machine body are symmetrically provided with fixing feet, the fixing feet are provided with fixing holes, and the sides of the machine body are provided with set screws near the rear opening.

[0011] Preferably, the heat dissipation fins are made of aluminum, and mounting plates are symmetrically arranged on both sides of the heat dissipation fins. The mounting plates are provided with multiple mounting holes, and the heat dissipation fins are fixed to the inside of the rear opening of the machine body by bolts.

[0012] Preferably, the drainage hood has an adapter pipe at its rear end and an insert ring at its front end, the insert ring being inserted into the opening at the rear end of the machine body; the set screw rests against the insert ring.

[0013] Preferably, one end of the corrugated hose is provided with an installation cap, which is threadedly connected to the adapter pipe; the other end of the corrugated hose is provided with a flow guide.

[0014] Preferably, the cooling fan is installed inside the air guide shroud and is threadedly connected to the air guide shroud. The top of the cooling fan is provided with a pressure ring for pressing against the top of the air guide shroud. A connecting wire is provided on the side of the cooling fan, and a connecting plug is provided at the end of the connecting wire.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model incorporates a dual-channel analog input module and a logic control module within a disturbance-free switching device, with a first PT and a second PT connected in series on each bus section. The dual-channel analog input module of the disturbance-free switching device is connected to the secondary outputs of the first PT and the second PT, respectively. The logic control module receives signals from the first PT and the second PT, and triggers switching when both signals are below the set value. This method simplifies the system structure, reduces maintenance costs, shortens switching time, and effectively prevents equipment tripping accidents caused by power switching delays by eliminating the current detection link.

[0017] 2. By incorporating a corrugated flexible hose and an exhaust fan, the heat generated by the non-disruptive switching device can be directly discharged to the outside of the electrical control cabinet, thus preventing the heat from being discharged into the cabinet and increasing the heat dissipation burden on the non-disruptive switching device. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of the entire utility model;

[0019] Figure 2 This is a structural block diagram of the logic control module of this utility model;

[0020] Figure 3 This is a schematic diagram of the connection between the first PT and the second PT of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the disturbance-free switching device of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the body of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the heat dissipation fins of this utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the drainage cover of this utility model;

[0025] Figure 8 This is a structural schematic diagram of the corrugated flexible hose of this utility model.

[0026] Figure 9 This is a schematic diagram of the cooling fan of this utility model.

[0027] In the diagram: 1. Main body; 11. Control panel; 12. Mounting foot; 13. Mounting hole; 14. Set screw; 2. Heat dissipation fins; 21. Mounting plate; 22. Mounting hole; 3. Flow guide cover; 31. Adapter pipe; 32. Insert ring; 4. Corrugated flexible hose; 41. Mounting cap; 42. Flow guide cover; 5. Cooling fan; 51. Pressure ring; 52. Connecting wire; 53. Connecting plug. Detailed implementation method:

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0030] Example 1

[0031] like Figure 1 and Figure 3 As shown, a disturbance-free power supply device for chemical plants based on dual PT logic switching includes a disturbance-free switching device, a first PT, and a second PT. The disturbance-free switching device integrates an MCU control module, which is connected to a logic control module and a dual-channel analog input module. The first PT and the second PT are installed at different positions on the same busbar. The dual-channel analog input module is connected to the secondary outputs of the first PT and the second PT, respectively. The logic control module is used to receive signals from the first PT and the second PT, and triggers switching when both signals are lower than the set value.

[0032] like Figure 2 As shown, the logic control module includes an analog input unit, a signal processing unit, a logic operation unit, a control output unit, and a human-machine interface unit. The analog input unit is used to receive the voltage signals output by the first PT and the second PT and complete the analog-to-digital conversion. The signal processing unit is used to filter, calculate the effective value, and compare the amplitude of the received voltage signals. The logic operation unit is used to perform dual PT logic switching judgment. The control output unit is used to send opening and closing commands to the circuit breaker. The human-machine interface unit is used for parameter setting, status display, and fault query.

[0033] Example 2

[0034] like Figure 1 and Figure 3As shown, a disturbance-free power supply device for chemical plants based on dual PT logic switching includes a disturbance-free switching device, a first PT, and a second PT. The disturbance-free switching device integrates an MCU control module, which is connected to a logic control module and a dual-channel analog input module. The first PT and the second PT are installed at different positions on the same busbar. The dual-channel analog input module is connected to the secondary outputs of the first PT and the second PT, respectively. The logic control module is used to receive signals from the first PT and the second PT, and triggers switching when both signals are lower than the set value.

[0035] like Figure 2 As shown, the logic control module includes an analog input unit, a signal processing unit, a logic operation unit, a control output unit, and a human-machine interface unit. The analog input unit is used to receive the voltage signals output by the first PT and the second PT and complete the analog-to-digital conversion. The signal processing unit is used to filter, calculate the effective value, and compare the amplitude of the received voltage signals. The logic operation unit is used to perform dual PT logic switching judgment. The control output unit is used to send opening and closing commands to the circuit breaker. The human-machine interface unit is used for parameter setting, status display, and fault query.

[0036] like Figure 4 As shown, the disturbance-free switching device includes a body 1. Heat dissipation fins 2 are installed at the rear opening of the body 1. These fins absorb heat generated inside the body 1, facilitating heat dissipation. A through-hole is provided on the side of the body 1 behind the heat dissipation fins 2, ensuring ventilation at the rear of the body 1 for further heat dissipation. A flow guide shroud 3 is installed at the rear opening of the body 1. A corrugated hose 4 is located at the rear of the flow guide shroud 3. The flow guide shroud 3, in conjunction with the corrugated hose 4, guides the airflow. A cooling fan 5 is connected to the end of the corrugated hose 4. The cooling fan 5 works with the through-hole at the rear of the body 1 to facilitate airflow, thereby removing the heat generated on the heat dissipation fins 2.

[0037] like Figure 5 As shown, the front of the main body 1 is provided with a control panel 11, which facilitates the operation of the main body 1. The front sides of the main body 1 are symmetrically provided with fixing feet 12, and fixing holes 13 are provided on the fixing feet 12. The fixing feet 12 and fixing holes 13 facilitate the fixing of the main body 1 to the control cabinet of the power system. Set screws 14 are provided on both sides of the main body 1 near the rear opening, which facilitates the fixing of the drain cover 3.

[0038] like Figure 6 As shown, the heat dissipation fins 2 are made of aluminum, and mounting plates 21 are symmetrically arranged on both sides of the heat dissipation fins 2. The mounting plates 21 are provided with multiple mounting holes 22. The heat dissipation fins 2 are fixed to the inner side of the rear opening of the body 1 by bolts. This structure ensures that the heat dissipation fins 2 are stably connected and used with the body 1.

[0039] like Figure 7 As shown, the drainage cover 3 has an adapter pipe 31 at its rear end, which facilitates connection with the corrugated hose 4. The drainage cover 3 has an insert ring 32 at its front end, which is inserted into the opening at the rear end of the body 1; the set screw 14 rests against the insert ring 32, ensuring the stable installation and use of the drainage cover 3.

[0040] like Figure 8 As shown, one end of the corrugated hose 4 is provided with a mounting cap 41, which is threadedly connected to the adapter pipe 31; the other end of the corrugated hose 4 is provided with a flow guide 42, which is used to connect to the cooling fan 5.

[0041] like Figure 9 As shown, the cooling fan 5 is installed inside the air guide shroud 42 and is threadedly connected to the air guide shroud 42. The top of the cooling fan 5 is provided with a pressure ring 51 for pressing against the top of the air guide shroud 42. The side of the cooling fan 5 is provided with a connecting wire 52, and the end of the connecting wire 52 is provided with a connecting plug 53. The connecting wire 52 and the connecting plug 53 facilitate the power supply to the cooling fan 5.

[0042] Working principle: In use, the disturbance-free switching device is installed on the control cabinet of the power system, and the exhaust end of the cooling fan 5 is installed on the outside of the control cabinet through the corrugated hose 4 to ensure that the heat generated by the disturbance-free switching device is directly discharged to the outside of the control cabinet. The setting value is set through the disturbance-free switching device. Then, the entire power system is operated. When the logic control module receives the first PT signal and the second PT signal, both of which are lower than the setting value, the switching is triggered without waiting for the current signal to disappear.

[0043] In summary, compared with the prior art, this application sets up a non-disruptive switching device with a dual-channel analog input module and a logic control module inside, and connects a first PT and a second PT in series on each bus section. The dual-channel analog input module of the non-disruptive switching device is connected to the secondary output of the first PT and the second PT respectively. The logic control module receives the signals from the first PT and the second PT, and triggers switching when both signals are lower than the set value. This method simplifies the system structure, reduces maintenance costs, shortens the switching time, and effectively prevents equipment tripping accidents caused by power switching delays by eliminating the current detection link.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A disturbance-free power supply device for chemical plants based on dual PT logic switching, comprising a disturbance-free switching device, a first PT, and a second PT, characterized in that, The disturbance-free switching device integrates an MCU control module, which is connected to a logic control module and a dual-channel analog input module. The first PT and the second PT are installed at different positions on the same bus. The dual-channel analog input module is connected to the secondary outputs of the first PT and the second PT respectively. The logic control module is used to receive the signals from the first PT and the second PT, and triggers switching when both signals are lower than the set value.

2. The chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 1, characterized in that, The logic control module includes an analog input unit, a signal processing unit, a logic operation unit, a control output unit, and a human-machine interface unit. The analog input unit receives voltage signals from the first and second power breaker (PT) and performs analog-to-digital conversion. The signal processing unit filters, calculates the effective value, and compares the amplitude of the received voltage signals. The logic operation unit performs dual-PT logic switching judgment. The control output unit sends opening and closing commands to the circuit breaker. The human-machine interface unit is used for parameter setting, status display, and fault query.

3. The chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 1, characterized in that, The disturbance-free switching device includes a body (1), a heat dissipation fin (2) is installed at the rear opening of the body (1), a through hole is provided on the side of the body (1) along the rear of the heat dissipation fin (2), a flow guide shroud (3) is installed at the rear opening of the body (1), a corrugated hose (4) is provided at the rear end of the flow guide shroud (3), and a cooling fan (5) is connected to the end of the corrugated hose (4).

4. A chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 3, characterized in that, The front of the machine body (1) is provided with a control panel (11), and the front sides of the machine body (1) are symmetrically provided with fixing feet (12), the fixing feet (12) are provided with fixing holes (13), and the sides of the machine body (1) near the rear opening are provided with set screws (14).

5. A chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 3, characterized in that, The heat dissipation fins (2) are made of aluminum, and mounting plates (21) are symmetrically provided on both sides of the heat dissipation fins (2). The mounting plates (21) are provided with multiple mounting holes (22). The heat dissipation fins (2) are fixed to the inner side of the rear opening of the body (1) by bolts.

6. A chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 4, characterized in that, The drainage cover (3) has a connecting pipe (31) at the rear end and a plug ring (32) at the front end. The plug ring (32) is inserted into the opening at the rear end of the machine body (1). The set screw (14) abuts against the plug ring (32).

7. A chemical plant disturbance-free power supply device based on dual PT logic switching according to claim 6, characterized in that, One end of the corrugated hose (4) is provided with an installation cap (41), which is threadedly connected to the adapter pipe (31); the other end of the corrugated hose (4) is provided with a flow guide (42).

8. A chemical industry disturbance-free power supply device based on dual PT logic switching according to claim 7, characterized in that, The cooling fan (5) is installed inside the air guide (42) and is threadedly connected to the air guide (42). The top of the cooling fan (5) is provided with a pressure ring (51) for pressing against the top of the air guide (42). The side of the cooling fan (5) is provided with a connecting wire (52) and the end of the connecting wire (52) is provided with a connecting plug (53).

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