A static device for switching power between different power sources

Abstract

This invention relates to the field of power supply and distribution technology for important data centers and important low-voltage equipment. Specifically, it discloses a static device for switching power supply between different power sources. The I-channel and II-channel incoming terminals are respectively connected to the incoming terminals of the corresponding main circuit control molded case circuit breakers in the operation display area. The outgoing terminals of the corresponding main circuit control molded case circuit breakers in the operation display area are respectively connected to the incoming terminals of fuses and thyristors in the main circuit area. The outgoing terminals of the thyristors in the main circuit area are connected to the incoming terminals of the corresponding main circuit control molded case circuit breakers. This invention can complete the switching between two power sources in a short time even when the two incoming power sources are of different phases, while simultaneously realizing intelligent protection functions such as comprehensive undervoltage detection, overvoltage detection, and temperature fault detection.

Description

Technical Field

[0001] This invention belongs to the field of power supply and distribution for important data centers and important low-voltage equipment, and specifically relates to a static device for switching power supply between different power sources. Background Technology

[0002] In recent years, with the continuous construction of key national projects and the widespread application of measurement and control equipment, higher requirements have been placed on the continuity and reliability of power supply. Important low-voltage equipment such as communication systems, field monitoring systems, and data centers generally operate in complex environments and are installed in dispersed locations. Once a power outage occurs, it will cause chaos in the control of such equipment, resulting in the destruction or loss of information being processed, which will seriously affect the stable operation of key national projects.

[0003] Existing technologies employ dual power supplies, but require the two incoming power supplies to have the same phase sequence. This makes automatic switching inconvenient or slow, easily causing malfunctions such as interruptions in on-site monitoring system testing, data loss, and misoperation. In particular, it cannot meet the uninterrupted power supply needs of critical industries. Furthermore, this type of power supply device itself does not have power distribution functions, requiring users to equip themselves with a separate distribution box. If one of the distribution switches is replaced, it will affect the normal power supply of other circuits, making subsequent operation and maintenance complex and costly. Moreover, this type of power supply device lacks a universal networking interface, failing to meet users' remote centralized monitoring needs.

[0004] Therefore, there is an urgent need to design a static device for switching power between different power sources to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a static device for switching power between different power sources, which can still complete the switching between the two power sources in a short time when the two incoming power sources are in different phases.

[0006] The technical solution of the present invention is as follows:

[0007] A static device for switching power between different power sources, with a modular layout, and the cabinet contains a main circuit area, an operation display area, a control area, a power distribution area, and a wiring area;

[0008] The main circuit area is located in the upper part of the cabinet, and the circuit components in the main circuit area include fuses and thyristors.

[0009] The operation display area is located below the main circuit area and includes an industrial display screen, indicator lights, and a main circuit control molded case circuit breaker; wherein, the industrial display screen and indicator lights are used to display the status parameters of the two incoming power supplies, the working status of the main circuit control molded case circuit breaker, fault alarm records, and the working status of the device.

[0010] The control area and power distribution area are located below the operation display area; the control area is equipped with a control board; the power distribution area is equipped with a molded case circuit breaker or miniature circuit breaker and its mechanical handle. The mechanical handle is operated to control the opening and closing of the corresponding molded case circuit breaker or miniature circuit breaker to supply power to the load.

[0011] The wiring area is located below the power distribution area. The wiring area includes an incoming terminal (I), an incoming terminal (II), and a load power supply terminal. The incoming terminals (I and II) are connected to the corresponding incoming terminals of the main circuit control molded case circuit breakers in the operation display area. The outgoing terminals of the corresponding main circuit control molded case circuit breakers in the operation display area are connected to the incoming terminals of the fuses and thyristors in the main circuit area. The outgoing terminals of the thyristors in the main circuit area are connected to the corresponding incoming terminals of the main circuit control molded case circuit breakers.

[0012] The output terminal of the main circuit control molded case circuit breaker in the operation display area is connected to the incoming copper busbar of the power distribution circuit in the power distribution area; the output terminal of the molded case circuit breaker or miniature circuit breaker of the corresponding power distribution circuit in the power distribution area is connected to the corresponding load power supply terminal in the wiring area.

[0013] The main circuit control molded case circuit breaker includes a power supply incoming line molded case circuit breaker QF1, a power supply incoming line molded case circuit breaker QF2, a main circuit outgoing line molded case circuit breaker QF3, a power supply bypass molded case circuit breaker QF4, and a power supply bypass molded case circuit breaker QF5.

[0014] The thyristors include a group of thyristors SCR1 and a group of thyristors SCR2;

[0015] The aforementioned molded case circuit breaker or miniature circuit breaker for power distribution circuits includes molded case circuit breaker or miniature circuit breaker QF6, QF7, QF8, QF9, QF10, and QF11.

[0016] The I-channel and II-channel incoming terminals are respectively connected to the incoming terminals of the I-channel power incoming molded case circuit breaker QF1, the II-channel power incoming molded case circuit breaker QF2, the I-channel power bypass molded case circuit breaker QF4, and the II-channel power bypass molded case circuit breaker QF5 in the operation display area; the outgoing terminals of the I-channel power incoming molded case circuit breaker QF1 and the II-channel power incoming molded case circuit breaker QF2 in the operation display area are respectively connected to the incoming terminals of the fuse, the I-group SCR1, and the II-group SCR2 in the main circuit area; the outgoing terminals of the I-group SCR1 and the II-group SCR2 in the main circuit area are connected to the incoming terminal of the main circuit outgoing molded case circuit breaker QF3.

[0017] The main circuit outgoing molded case circuit breaker QF3, the I-circuit bypass molded case circuit breaker QF4, and the II-circuit bypass molded case circuit breaker QF5 in the operation display area are connected to the incoming copper busbar of the power distribution circuit in the power distribution area. The outgoing terminals of the power distribution circuit molded case circuit breakers or miniature circuit breakers QF6, QF7, QF8, QF9, QF10, and QF11 in the power distribution area are connected to the corresponding load power supply terminals in the wiring area.

[0018] During normal operation, the molded case circuit breaker QF1 for the incoming power supply line I, the molded case circuit breaker QF2 for the incoming power supply line II, and the molded case circuit breaker QF3 for the main circuit outgoing line in the operation display area are closed;

[0019] If the load is preferentially powered by the I incoming power supply, then the I group of thyristors SCR1 in the main circuit area will be turned on, and the II group of thyristors SCR2 will not be turned on; when the control board in the control area determines that the I incoming power supply is faulty through the detection circuit, it will turn off the I group of thyristors SCR1 in the main circuit area, trigger the II group of thyristors SCR2 to be turned on, and switch the load from the I incoming power supply to the II incoming power supply;

[0020] When the incoming power supply of line I supplies power to the load, closing the circuit breaker QF4 of the bypass circuit breaker of line I in the operation display area and opening the circuit breaker QF1 of the incoming power supply of line I, the circuit breaker QF2 of the incoming power supply of line II, the circuit breaker QF3 of the main circuit outgoing line, and the circuit breaker QF5 of the bypass circuit breaker of line II in the operation display area can realize online maintenance of the thyristor SCR1 and the thyristor SCR2 of line I in the main circuit area without affecting the power supply to the load;

[0021] When power is supplied first to the second incoming line, the principle is the same as described above.

[0022] An RC branch, including a capacitor and a resistor, is added to the output terminal of the main circuit area. The voltage rise rate is limited by the characteristic that the voltage across the capacitor cannot change abruptly, which prevents the thyristor from being damaged by overvoltage due to oscillation. At the same time, it can avoid the capacitor discharging too much current through the thyristor, which would cause overcurrent and damage the thyristor.

[0023] The industrial display screen uses a touch screen and encapsulates the main circuit hardware and control software. It is connected to the control board in the control area via an RS485 serial interface to update the three-phase voltage and current of the incoming power supply lines I and II, the temperature of the silicon controlled rectifier, and the three-phase voltage and current of the output terminals in real time. It also displays the current operating status of the molded case circuit breaker in the power supply circuit, the current priority setting, and fault record information.

[0024] The control software uses a sliding window detection algorithm to detect voltage faults. The specific detection method is as follows:

[0025] Take one period as the sliding window, and divide the period into n equal parts. Each time, add the sampling points within 1 / n periods to the sliding window, and remove the sampling points within the earliest 1 / n periods from the sliding window. At the same time, directly compare the sampled values ​​with the threshold values. By judging the number of sampling points within the threshold range, the power supply status is determined.

[0026] The control area is divided into a trigger control loop and a temperature control loop, both of which are feedback controls;

[0027] The trigger control circuit consists of a control board in the control area, a Hall element in the main circuit area, a trigger board, and auxiliary contacts of the main circuit control molded case circuit breaker in the operation display area. It transmits the voltage, current, and circuit breaker operating status parameters to the control board in the control area, and determines the operating status of the main circuit power supply line based on these parameters. It then sends corresponding signals to control the on / off state of the thyristor, thereby achieving the purpose of intelligent selection of power supply.

[0028] The temperature control loop consists of a control board in the control area connected to a platinum resistance thermometer and a fan in the main loop area. The temperature information collected by the platinum resistance thermometer is transmitted to the control board in the control area. After judgment, the speed of the fan in the main loop area is controlled by adjusting the duty cycle of the pulse width modulation waveform to cool the system by air cooling.

[0029] The control board in the control area uses a DSP28377D and an LPC1788 microprocessor; the control area and the main circuit area are connected through digital signal input and output interfaces to realize the conversion between external digital signals and DSP signals.

[0030] The control board in the control area is equipped with an RS485 communication interface and an RJ-45 Ethernet interface, which can be directly connected to the monitoring equipment in the central control room to flexibly realize real-time data interaction between upper and lower levels, and provide an expansion interface for realizing intelligent power distribution in a central management mode.

[0031] The power switch of the control circuit in the main circuit area is connected to the DC redundant power supply unit, and two redundant power supplies are used to provide power to the control area.

[0032] The significant advantages of this invention are:

[0033] This invention can switch between two power supplies in a short time even when they are in different phases. It also provides intelligent protection functions such as comprehensive undervoltage detection, overvoltage detection, and temperature fault detection. It displays, records, and analyzes power status information in real time, generates alarm signals that can be transmitted remotely, has power distribution capabilities, a remote monitoring interface, flexible installation, simple and quick maintenance, high reliability, and wide applicability. Specifically:

[0034] (1) This invention develops a sliding window detection algorithm, which realizes rapid digital detection and improves detection accuracy;

[0035] (2) The present invention uses the forced shutdown of the thyristor to achieve the function of fast switching within 5ms;

[0036] (3) The present invention adopts a drawer-type modular structure, which improves the anti-interference capability of the control system, increases the power distribution function, enhances the flexibility of unit module reorganization and utilization, and makes it easier to operate and maintain.

[0037] (4) The control system of the present invention uses two DC redundant power supply units to power the system, which solves the problem of uneven current distribution caused by the unequal voltage of the two circuits and enhances the stability of the system; at the same time, it uses RC branches to protect important components and extend their service life.

[0038] (5) The human-computer interaction interface of the present invention has intuitive operating status and fault prompts, providing a basis for fault diagnosis and improving operation and maintenance efficiency;

[0039] (6) The interface of this invention is flexible and provides an extended interface for realizing intelligent power distribution in a central management mode. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the component mounting structure of the main circuit area and operation display area of ​​the present invention;

[0042] Figure 3 This is a schematic diagram of the main circuit area connection of the present invention;

[0043] Figure 4 This is a schematic diagram of the control area connection of the present invention;

[0044] Figure 5 This is a schematic diagram of the connection of the main road section resistance-capacitance branch circuit of the present invention.

[0045] In the diagram: 1. Main circuit area; 2. Operation display area; 3. Industrial display screen; 4. Indicator light; 5. Control area; 6. Power distribution area; 7. External wiring area; 8. Cabinet; 9. Hall effect sensor; 10. Fuse; 11. Platinum resistance thermometer; 12. Trigger board; 13. Capacitor; 14. Resistor; 15. SCR; 16. Control circuit power switch; 17. DC redundant power supply unit; 18. Fan; 19. Main circuit control molded case circuit breaker; 20. Power input terminal for circuit I; 21. Power input terminal for circuit II; 22. Power input circuit breaker for circuit I (QF1); 23. Power input circuit breaker for circuit II (QF2); 24. SCR1 (Group I); 25. 26. Group II SCR2; 27. Circuit Breaker I (Power Supply Bypass) QF4; 28. Main Circuit Outgoing Circuit Breaker QF3; 29. ​​Circuit Breaker II (Power Supply Bypass) QF5; 30. Power Distribution Circuit Incoming Copper Busbar; 31. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF6; 32. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF7; 33. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF8; 34. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF9; 35. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF10; 36. Power Distribution Circuit Molded Case Circuit Breaker or Miniature Circuit Breaker QF11; 37. Load Power Supply Terminal; 38. User. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] like Figures 1-5 The static device shown is a power switching device between different power sources. It adopts a modular layout. The cabinet 8 is equipped with a main circuit area 1, an operation display area 2, a control area 5, a power distribution area 6, and a wiring area 7.

[0048] The main circuit area 1 is located in the upper part of the cabinet 8. The circuit components of the main circuit area 1 include components such as fuses 10, capacitors 13, resistors 14, and silicon controlled rectifiers (SCRs) 15, as well as Hall effect sensors 9, platinum resistance thermometers 11, trigger boards 12, control circuit power switches 16, DC redundant power supply units 17, and fans 18. The SCRs 15 include a group of SCRs I (SCR124) and a group of SCRs II (SCR225).

[0049] The operation display area 2 is located below the main circuit area 1 and includes an industrial display screen 3, indicator lights 4, and a main circuit control molded case circuit breaker 19. The main circuit control molded case circuit breaker 19 includes a power inlet molded case circuit breaker QF122 (I-channel), a power inlet molded case circuit breaker QF223 (II-channel), a main circuit outlet molded case circuit breaker QF327, a power bypass molded case circuit breaker QF426 (I-channel), and a power bypass molded case circuit breaker QF528 (II-channel). The industrial display screen 3 and indicator lights 4 are located on the front door of the cabinet 8 and are used to display the status parameters of the two incoming power lines, the operating status of the main circuit control molded case circuit breaker 19, fault alarm records, and the operating status of the device.

[0050] Both the control area 5 and the power distribution area 6 are drawer-type structures, located below the operation display area 2. The control area 5 houses the control board, which is the core of the entire device. The power distribution area 6 contains molded case circuit breakers or miniature circuit breakers for the power distribution circuits and their mechanical handles. The on / off state of the corresponding molded case circuit breaker or miniature circuit breaker can be controlled by operating the mechanical handle to supply power to the load. The molded case circuit breakers or miniature circuit breakers include QF630, QF731, QF832, QF933, QF1034, and QF1135.

[0051] The wiring area 7 is located below the power distribution area 6. Within the wiring area 7, the left side contains the I-way incoming terminal 20 and the II-way incoming terminal 21, and the right side contains the load power supply terminal 36. The I-way incoming terminal 20 and the II-way incoming terminal 21 in the wiring area 7 are respectively connected to the QF122, QF223, QF426, and QF528 incoming terminals in the operation display area 2. The QF122 and QF223 outgoing terminals in the operation display area 2 are respectively connected to the fuse 10, the I-way SCR124, and the II-way SCR225 incoming terminals in the main circuit area 1. The I-way SCR124 and the II-way SCR225 in the main circuit area 1... The output terminal 25 is connected to the input terminal of QF327; the output terminals of QF327, QF426 and QF528 in the operation display area 2 are connected to the copper busbar 29 of the power distribution circuit in the power distribution area 6; the output terminals of the molded case circuit breakers or miniature circuit breakers QF630, QF731, QF832, QF933, QF1034 and QF1135 in the power distribution circuit in the power distribution area 6 are connected to the corresponding load power supply terminals 36 in the wiring area 7, namely ①, ②, ③, ④, ⑤ and ⑥.

[0052] In this embodiment, during normal operation, QF122, QF223, and QF327 in operation display area 2 are closed. If the load is preferentially powered by the I-line power supply, SCR124 in main circuit area 1 is turned on, and SCR225 is not turned on. When the control board in control area 5 determines that the I-line power supply is faulty through the detection circuit, it will turn off SCR124 in main circuit area 1, triggering SCR225 to turn on, switching the load from the I-line power supply to the II-line power supply. When the I-line power supply is supplying power to the load, closing QF426 in operation display area 2 and opening QF122, QF223, QF327, and QF528 in operation display area 2 allows for online maintenance and repair of SCR124 and SCR225 in main circuit area 1 without affecting the power supply to the load. The principle is the same when the II-line power supply is preferentially powered.

[0053] like Figure 5 As shown, an RC branch including capacitor 13 and resistor 14 is added to the output terminal of the main circuit section 1 to protect important components, extend their service life, and improve control accuracy. The characteristic that the voltage across capacitor 13 cannot change abruptly limits the voltage rise rate, preventing damage to the thyristor 15 due to overvoltage caused by oscillation. Simultaneously, it avoids excessive discharge current through capacitor 13 to the thyristor 15, which could cause overcurrent and damage the thyristor 15.

[0054] The control circuit power switch 16 in the main circuit area 1 is connected to the DC redundant power supply unit 17. The dual redundant power supply provides the necessary power to the control area 5, which solves the problem of uneven current distribution caused by the unequal voltage of the two circuits and enhances the stability of the control system.

[0055] Industrial display screen 3 uses a touch screen and encapsulates the main circuit hardware and control software required for display. It can be easily connected to the control board in control area 5 via RS485 serial interface to update the three-phase voltage and current of the I and II incoming power lines, the temperature of the main circuit thyristor, and the three-phase voltage and current of the output terminals in real time. At the same time, it displays the current operating status of the molded case circuit breaker in the power supply circuit, the current priority setting, fault records, and other information.

[0056] The control board in control area 5 is the core of the entire power supply unit. In this embodiment, the control board uses a small-package, low-power DSP28377D and LPC1788 microprocessor. It boasts high processing speed and strong processing capabilities, and can simultaneously possess more AD sampling ports, achieving a sampling accuracy of up to 16 bits. Control area 5 is connected to main circuit area 1 via digital signal input and output interfaces to achieve the conversion between external digital signals and DSP signals. Control board signal input refers to converting external 5V switching signals into the 3.3V switching signals required by the DSP; output refers to converting the digital signals output by the DSP into relay switching actions. To ensure that external signals do not interfere with the control signals and to perform corresponding level conversions, both the input and output of the switching signals are isolated using optocouplers.

[0057] Control zone 5 can be divided into a trigger control loop and a temperature control loop, both of which are feedback control. The trigger control loop consists of a control board within control zone 5 connected to the Hall element 9 and trigger board 12 in main circuit zone 1, and the auxiliary contacts of the main circuit control molded case circuit breaker 19 in operation display zone 2. It transmits sampled voltage, current, and circuit breaker operating status parameters to the control board within control zone 5, and determines the operating status of the main circuit power supply line based on these parameters, sending corresponding signals to control the on / off state of SCR124 and SCR225, achieving intelligent selection of the power supply. The temperature control loop consists of a control board within control zone 5 connected to the platinum resistance thermometer 11 and fan 18 in main circuit zone 1. The temperature information collected by the platinum resistance thermometer 11 is transmitted to the control board within control zone 5. After judgment, the fan speed is controlled by adjusting the duty cycle of the pulse width modulation waveform, using air cooling to cool the system and improve system reliability.

[0058] This invention integrates a voltage fault detection method into dedicated software, employing a sliding window algorithm to smoother RMS value detection and improve detection accuracy. The principle is to use a single period as the sliding window, dividing the period into n equal parts. Each time, sampling points within 1 / n of the period are added to the sliding window, while the earliest collected sampling points within the first 1 / n periods are removed. This updates the RMS value every 1 / n periods, improving the accuracy of RMS value calculation. Simultaneously, the sampled value is directly compared to a threshold value; the power supply status is determined by the number of sampling points within the threshold range, eliminating the need to wait for the entire measurement period and thus shortening the voltage fault detection time.

[0059] The control board in control area 5 is equipped with an RS485 communication interface and an RJ-45 Ethernet interface, which can be directly connected to the monitoring equipment in the central control room to flexibly realize real-time data interaction between upper and lower levels, and provide an expansion interface for realizing intelligent power distribution in a central management mode.

[0060] Compared to existing technologies, this invention employs a sliding window detection algorithm, which can quickly detect power status and complete the switching between two power sources within 5ms, providing intuitive operating status and fault indications. This device has no phase sequence requirements for the front-end power supply and has power distribution functions, which can flexibly meet the user's power distribution needs. This device has a remote monitoring interface, which can realize remote monitoring functions in a central management mode.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A static device for switching power supply between different power sources, characterized in that: The modular layout is adopted, and the cabinet (8) is equipped with a main circuit area (1), an operation display area (2), a control area (5), a power distribution area (6), and a wiring area (7). The main circuit area (1) is located in the upper part of the cabinet (8), and the circuit components of the main circuit area (1) include fuses (10) and thyristors (15). The operation display area (2) is located below the main circuit area (1) and includes an industrial display screen (3), indicator lights (4), and a main circuit control molded case circuit breaker (19); wherein, the industrial display screen (3) and indicator lights (4) are used to display the status parameters of the two incoming power supplies, the working status of the main circuit control molded case circuit breaker (19), fault alarm records, and the working status of this device; The control area (5) and the power distribution area (6) are located below the operation display area (2); a control board is provided in the control area (5); a molded case circuit breaker or miniature circuit breaker and its mechanical handle are provided in the power distribution area (6). The opening and closing of the corresponding molded case circuit breaker or miniature circuit breaker is controlled by operating the mechanical handle to realize the power supply to the load. The wiring area (7) is located below the power distribution area (6). The wiring area (7) is provided with an incoming terminal (20), an incoming terminal (21), and a load power supply terminal (36). The incoming terminal (20) and the incoming terminal (21) are respectively connected to the incoming terminals of the corresponding main circuit control molded case circuit breakers (19) in the operation display area (2). The outgoing terminals of the corresponding main circuit control molded case circuit breakers (19) in the operation display area (2) are respectively connected to the incoming terminals of the fuses (10) and the thyristors (15) in the main circuit area (1). The outgoing terminals of the thyristors (15) in the main circuit area (1) are connected to the incoming terminals of the corresponding main circuit control molded case circuit breakers (19). The output terminal of the main circuit control molded case circuit breaker (19) in the operation display area (2) is connected to the incoming copper busbar (29) of the power distribution circuit in the power distribution area (6); the output terminal of the molded case circuit breaker or miniature circuit breaker of the power distribution circuit in the power distribution area (6) is connected to the corresponding load power supply terminal (36) in the wiring area (7).

2. The static device for switching power supply between different power sources as described in claim 1, characterized in that: The main circuit control molded case circuit breaker (19) includes a power supply incoming line molded case circuit breaker QF1 (22), a power supply incoming line molded case circuit breaker QF2 (23), a main circuit outgoing line molded case circuit breaker QF3 (27), a power supply bypass molded case circuit breaker QF4 (26) and a power supply bypass molded case circuit breaker QF5 (28). The thyristor (15) includes a group of thyristors SCR1 (24) and a group of thyristors SCR2 (25); The molded case circuit breaker or miniature circuit breaker of the power distribution circuit includes QF6 (30), QF7 (31), QF8 (32), QF9 (33), QF10 (34), and QF11 (35). The I-channel incoming terminal (20) and II-channel incoming terminal (21) are respectively connected to the incoming terminals of the I-channel power incoming molded case circuit breaker QF1 (22), the II-channel power incoming molded case circuit breaker QF2 (23), the I-channel power bypass molded case circuit breaker QF4 (26), and the II-channel power bypass molded case circuit breaker QF5 (28) in the operation display area (2); the I-channel power incoming molded case circuit breaker QF1 (22), the II-channel power incoming molded case circuit breaker QF2 (23), the I-channel power bypass molded case circuit breaker QF4 (26), and the II-channel power bypass molded case circuit breaker QF5 (28) in the operation display area (2); 22) The output terminals of the molded case circuit breaker QF2 (23) for the power supply input of circuit II are connected to the input terminals of the fuse (10), the first group of thyristors SCR1 (24), and the second group of thyristors SCR2 (25) in the main circuit area (1), respectively; the output terminals of the first group of thyristors SCR1 (24) and the second group of thyristors SCR2 (25) in the main circuit area (1) are connected to the input terminal of the molded case circuit breaker QF3 (27) for the main circuit output. The main circuit outgoing molded case circuit breaker QF3 (27), the I-circuit power bypass molded case circuit breaker QF4 (26), and the II-circuit power bypass molded case circuit breaker QF5 (28) in the operation display area (2) are connected to the incoming copper busbar (29) of the power distribution circuit in the power distribution area (6); the molded case circuit breaker or miniature circuit breaker QF6 (30) of the power distribution circuit in the power distribution area (6) is connected to the incoming copper busbar (29) of the power distribution circuit in the power distribution area (6). The outgoing terminals of the molded case circuit breaker or miniature circuit breaker QF7 (31), the molded case circuit breaker or miniature circuit breaker QF8 (32), the molded case circuit breaker or miniature circuit breaker QF9 (33), the molded case circuit breaker or miniature circuit breaker QF10 (34), and the molded case circuit breaker or miniature circuit breaker QF11 (35) of the power circuit are connected to the corresponding load power supply terminals (36) in the wiring area (7).

3. The static device for switching power supply between different power sources as described in claim 2, characterized in that: During normal operation, the molded case circuit breaker QF1 (22) for the incoming power supply line I, the molded case circuit breaker QF2 (23) for the incoming power supply line II, and the molded case circuit breaker QF3 (27) for the outgoing main circuit in the operation display area (2) are closed; If the load is preferentially powered by the I-line power supply, then the I-group SCR1 (24) in the main circuit area (1) will be turned on, and the II-group SCR2 (25) will not be turned on; when the control board in the control area (5) determines that the I-line power supply is faulty through the detection circuit, it will turn off the I-group SCR1 (24) in the main circuit area (1), trigger the II-group SCR2 (25) to be turned on, and switch the load from the I-line power supply to the II-line power supply; When the incoming power supply of the I-line supplies power to the load, close the I-line power bypass molded case circuit breaker QF4 (26) in the operation display area (2), and open the I-line power incoming molded case circuit breaker QF1 (22), the II-line power incoming molded case circuit breaker QF2 (23), the main circuit outgoing molded case circuit breaker QF3 (27), and the II-line power bypass molded case circuit breaker QF5 (28) in the operation display area (2). This allows for online maintenance of the I-group thyristor SCR1 (24) and the II-group thyristor SCR2 (25) in the main circuit area (1) without affecting the power supply to the load.

4. The static device for switching power supply between different power sources as described in claim 1, characterized in that: An RC branch consisting of a capacitor (13) and a resistor (14) is added to the output terminal of the main circuit region (1). The voltage rise rate is limited by the characteristic that the voltage across the capacitor (13) cannot change abruptly, so as to prevent the thyristor (15) from being damaged due to overvoltage caused by oscillation. At the same time, it can avoid the capacitor (13) from having an excessive discharge current through the thyristor (15), which would cause overcurrent and damage the thyristor (15).

5. A static device for switching power between different power sources as described in claim 1, characterized in that: The industrial display screen (3) adopts a touch screen display, encapsulates the main circuit hardware and control software, and connects to the control board in the control area (5) through the RS485 serial interface. It updates the three-phase voltage and current of the I and II incoming power supplies, the temperature of the thyristor (15), the three-phase voltage and current of the output terminal, and displays the current working status of the molded case circuit breaker in the current power supply circuit, the current priority setting, and fault record information.

6. The static device for switching power supply between different power sources as described in claim 5, characterized in that: The control software uses a sliding window detection algorithm to detect voltage faults. The specific detection method is as follows: Take one period as the sliding window, and divide the period into n equal parts. Each time, add the sampling points within 1 / n periods to the sliding window, and remove the sampling points within the earliest 1 / n periods from the sliding window. At the same time, directly compare the sampled values ​​with the threshold values. By judging the number of sampling points within the threshold range, the power supply status is determined.

7. A static device for switching power between different power sources as described in claim 1, characterized in that: The control area (5) is divided into a trigger control loop and a temperature control loop, both of which are feedback controls; The trigger control circuit is composed of the control board in the control area (5), the Hall element (9) in the main circuit area (1), the trigger board (12), and the auxiliary contacts of the main circuit control molded case circuit breaker (19) in the operation display area (2). It transmits the voltage, current and circuit breaker operating status parameters to the control board in the control area (5) by sampling the voltage, current and circuit breaker operating status parameters, and judges the operating status of the main circuit power supply line based on these parameters, and sends corresponding signals to control the on and off of the thyristor (15) to achieve the purpose of intelligent selection of power supply. The temperature control loop consists of a control board in the control area (5) connected to a platinum resistance thermometer (11) and a fan (18) in the main loop area (1). The temperature information collected by the platinum resistance thermometer (11) is transmitted to the control board in the control area (5) for judgment. The speed of the fan (18) in the main loop area (1) is controlled by adjusting the duty cycle of the pulse width modulation waveform to cool the system by air cooling.

8. A static device for switching power supply between different power sources as described in claim 1, characterized in that: The control board in the control area (5) uses DSP28377D and LPC1788 microprocessors; the control area (5) and the main circuit area (1) are connected through digital signal input and output interfaces to realize the conversion between external digital signals and DSP signals.

9. A static device for switching power supply between different power sources as described in claim 1, characterized in that: The control board in the control area (5) is equipped with an RS485 communication interface and an RJ-45 Ethernet interface, which can be directly connected to the monitoring equipment in the central control room to flexibly realize the real-time data interaction function between the upper and lower levels, and provide an extended interface for realizing intelligent power distribution in the central management mode.

10. A static device for switching power supply between different power sources as described in claim 1, characterized in that: The control circuit power switch (16) in the main circuit area (1) is connected to the DC redundant power supply unit (17), and two redundant power supplies are used to provide power to the control area (5).

Images