Power grid adaptive multifunctional temporary power connection box
By designing a grid-adaptive multifunctional temporary junction box, automatic switching and compatibility between AC and DC power supplies were achieved, solving the problem of cumbersome operation of existing equipment and improving the convenience and safety of temporary power use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-03-31
AI Technical Summary
Existing temporary power supply equipment cannot be compatible with both AC and DC power supply at the same time. It is cumbersome and inefficient to operate, requiring multiple devices to be carried or manual power switching.
A power grid-adaptive multifunctional temporary junction box was designed, which includes an input unit, an output unit, an automatic switching unit, an AC phase sequence double-sided verification component, and a DC voltage double-sided checking component, to realize automatic switching and compatibility of AC and DC power supplies. It adopts an insulation isolation design and a staggered terminal block layout.
It enables rapid and compatible switching between AC and DC power supplies, eliminating the need to carry multiple devices or operate manually, greatly improving the convenience and efficiency of temporary power supply, and avoiding short circuit faults caused by cable inability to connect or incorrect phase sequence and phase.
Smart Images
Figure CN121770321A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fire safety, and in particular to a power grid-adaptive multifunctional temporary junction box. Background Technology
[0002] In temporary power supply scenarios such as building construction, emergency rescue, and outdoor equipment debugging, it is often necessary to use both AC and DC power supply equipment simultaneously. In order to avoid the impact of sudden power outages on operations, two AC backup power supplies are usually required.
[0003] Currently, existing temporary power connection equipment only supports a single AC or DC input, which cannot meet the needs of AC / DC mixed use. Although some equipment can achieve dual AC power switching, it requires manual operation and is not compatible with DC input. This means that when users need temporary power, they either need to carry multiple dedicated devices to adapt to different power types, or they need to manually switch power and check the phase sequence, which is cumbersome and inefficient. Summary of the Invention
[0004] Therefore, the technical problem to be solved by the present invention is that existing temporary power connection equipment is cumbersome to operate and inefficient.
[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a power grid-adaptive multifunctional temporary junction box, which includes an input unit. The input unit includes a first AC input subunit and a second AC input subunit. The first AC input subunit is used to connect to a first AC power source, and the second AC input subunit is used to connect to a second AC power source and also serves as a DC input circuit. Output unit, the output unit is used to output AC or DC power; An automatic switching unit is connected between the input unit and the output unit to enable switching between two AC power sources. AC phase sequence double-sided verification component and DC voltage double-sided inspection component; among them; The AC phase sequence bilateral verification component is connected in series to the AC circuit of the input unit and the output unit for AC phase sequence verification; the DC voltage bilateral checking component is connected in series to the DC circuit of the input unit and the output unit for DC voltage checking. The AC subunit of the input unit is designed to be insulated from the DC circuit, and the temporary AC / DC power supply function is achieved through the cooperation of each unit.
[0006] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the first AC input subunit includes ~1A terminal, ~1B terminal, ~1C terminal, and ~1N terminal; wherein, the input unit adopts a two-layer staggered terminal layout, with the upper terminal corresponding to the first AC input subunit and the lower terminal corresponding to the second AC input subunit.
[0007] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the second AC input subunit includes a ~2A / +DC terminal, a ~2B terminal, a ~2C / -DC terminal, and a ~2N terminal; wherein the ~2A / +DC terminal and the ~2C / -DC terminal constitute a DC input circuit.
[0008] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the output unit includes a ~A / +DC terminal, a ~B terminal, a ~C / -DC terminal, and a ~N terminal; wherein... The ~A / +DC terminal and the ~C / -DC terminal constitute a DC output circuit. The output unit adopts a lower-level terminal arrangement, which corresponds to the lower-level terminal arrangement of the input unit.
[0009] In a preferred embodiment of the power grid adaptable multifunctional temporary junction box of the present invention: the automatic switching unit is connected between the same phase terminals of the first AC input subunit and the second AC input subunit, that is, between the ~1A terminal and the ~2A / +DC terminal, the ~1B terminal and the ~2B terminal, the ~1C terminal and the ~2C / -DC terminal, and the ~1N terminal and the ~2N terminal. The automatic switching unit only conducts one of the AC input subunits and the output unit at any given time.
[0010] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: when both the first AC input subunit and the second AC input subunit are powered normally, the automatic switching unit turns on the first AC input subunit. When the first AC input subunit loses power and the second AC input subunit is powered normally, the automatic switching unit switches to turn on the second AC input subunit. When the first AC input subunit is powered back, the automatic switching unit automatically switches back and turns on the first AC input subunit.
[0011] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the AC phase sequence double-sided verification component includes a phase sequence table, an AC incoming phase verification button and an AC outgoing phase verification button; The AC input phase sequence button is connected in series to the AC circuit of the second AC input subunit of the input unit, and the AC output phase sequence button is connected in series to the AC circuit of the output unit. Both output terminals are connected to the phase sequence table. Pressing the AC incoming phase sequence check button or the AC outgoing phase sequence check button will trigger the phase sequence table to perform phase sequence detection for the corresponding circuit.
[0012] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the AC incoming phase verification button and the AC outgoing phase verification button are connected in series. By double-sided phase verification, short circuit faults caused by the phase sequence of the AC input and output circuits being reversed are avoided. When the phase sequence is abnormal, the automatic switching unit can be triggered to lock out.
[0013] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the DC voltage bilateral checking component includes a voltmeter, a DC input voltage checking button and a DC output voltage checking button. The DC input voltage check button is connected in series to the DC circuit of the second AC input subunit of the input unit, and the DC output voltage check button is connected in series to the DC circuit of the output unit; both output terminals are connected to a voltmeter. Pressing the DC input voltage check button or the DC output voltage check button will trigger the voltmeter to detect the voltage of the corresponding circuit.
[0014] In a preferred embodiment of the power grid-adaptive multifunctional temporary junction box of the present invention: the DC input voltage check button and the DC output voltage check button are connected in series. By checking the voltage on both sides, short circuit faults caused by the DC input and output circuits being out of phase are avoided. When the phase is abnormal, the automatic switching unit can be triggered to lock out. The ~2A / +DC terminal and the ~2C / -DC terminal are isolated by the ~2B terminal, and the ~A / +DC terminal and the ~C / -DC terminal are isolated by the ~B terminal. The isolation avoids short circuit faults caused by accidental contact of the DC positive and negative terminals.
[0015] The beneficial effects of this invention are as follows: by using AC / DC terminal multiplexing design and dual-channel AC automatic switching unit, the integrated requirements of AC / DC input compatibility and rapid switching of main and backup power are realized, eliminating the need to carry multiple devices or manual intervention, greatly improving the convenience of temporary power supply. At the same time, the large-size wiring terminals and staggered layout of upper and lower layers effectively solve the problem of cable connectors of emergency generators, chargers and other equipment being unable to be connected, thus improving work efficiency. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A structural diagram of a power grid-adaptive multifunctional temporary junction box is shown. Figure 2 A connection diagram of the input unit, output unit, automatic switching unit, AC phase sequence bilateral verification component, and DC voltage bilateral checking component is shown. Figure 3 A side view of the interior of a grid-adaptive multi-functional temporary junction box is shown. Figure 4 The main circuit diagram of a power grid-adaptive multi-functional temporary junction box is shown. Figure 5 This diagram shows a dual-sided phase sequence diagram of a power grid-adaptive multifunctional temporary junction box. Figure 6 A bilateral DC voltage check diagram of a power grid-adaptive multi-functional temporary junction box is shown. Detailed Implementation
[0017] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0018] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.
[0019] Reference Figures 1-6 This embodiment provides a power grid-adaptive multi-functional temporary junction box, including: Input unit 1 includes a first AC input subunit 11 and a second AC input subunit 12. The first AC input subunit 11 is used to connect to a first AC power source, and the second AC input subunit 12 is used to connect to a second AC power source and also serves as a DC input circuit. The terminals of the two AC input circuits are ~1A, ~1B, ~1C, ~1N and ~2A / +DC, ~2B, ~2C / -DC, ~2N, respectively. The DC input circuit is formed by the ~2A / +DC and ~2C / -DC terminals of the second AC input subunit 12. This design achieves compatibility between AC and DC inputs through terminal multiplexing, eliminating the need for an additional independent DC input interface. This ensures a compact structure while simultaneously meeting the power connection requirements for dual AC backup power supply and DC system maintenance in substations.
[0020] It also includes an output unit 5, which is used to output AC and DC power. The AC output circuit terminals are ~A / +DC, ~B, ~C / -DC, and ~N, and the DC output circuit terminals are ~A / +DC and ~C / -DC. The specifications of the output terminals match those of the input terminals, which can be adapted to large-size cable connectors of emergency generators, emergency chargers, and other equipment, thus solving the problem of cables being unable to be connected due to the small wiring terminals of existing power supply panels.
[0021] It also includes an automatic switching unit 3, which is connected between the input unit 1 and the output unit 5 to realize the switching of the two AC power sources. The unit uses a motor-type switching switch, which can respond to the power supply status changes of the two AC power sources and avoid the problem of the two incoming lines being unable to switch due to AC contactor failure.
[0022] It also includes an AC phase sequence bilateral verification component 2 and a DC voltage bilateral checking component 5; wherein, the AC phase sequence bilateral verification component 2 is connected in series to the AC circuit of the input unit 1 and the output unit 5 for AC phase sequence verification; the DC voltage bilateral checking component 4 is connected in series to the DC circuit of the input unit 1 and the output unit 5 for DC voltage checking.
[0023] The AC subunit and DC circuit of input unit 1 adopt an insulation isolation design. Through the cooperation of each unit, the temporary power connection function of AC and DC power supply is realized. Specifically, the insulation isolation design adopts the method of using AC circuit and DC circuit together. That is, by optimizing the wiring spacing and insulation material separation, it is ensured that AC and DC circuits do not interfere with each other when they are working. At the same time, the AC input circuit of input unit 1 adopts a staggered wiring method with two layers, which increases the wiring operation space and avoids mutual interference when wiring between the upper and lower layers, which meets the usage requirements of the complex wiring environment of the substation.
[0024] In actual use, if AC power is required, the first AC input subunit 11 or the second AC input subunit 12 can be selected to connect to the corresponding AC power source. The automatic switching unit 3 enables flexible switching between main and backup power sources, allowing replacement of faulty power sources without power outages. This solves the problem of long-term power outages and waiting for spare parts when dealing with AC contactor faults in existing technologies. If DC power is required, it can be directly connected through the ~2A / +DC and ~2C / -DC terminals of the second AC input subunit 12 without the need for additional adapters. After power is connected, the AC phase sequence is verified by the AC phase sequence double-sided verification component 2 or the DC voltage is checked by the DC voltage double-sided checking component 4. After confirming that the wiring is correct, the output unit 5 outputs power stably to the terminal equipment, ultimately realizing various temporary power connection functions such as temporary power connection when AC is unavailable, temporary power connection when switching between dual AC sources, temporary power connection for emergency generator vehicles, and temporary power connection for emergency chargers or battery dischargers.
[0025] As an optional embodiment, this embodiment aims to clarify the terminal configuration and terminal layout of each unit, thereby improving wiring compatibility and structural compactness.
[0026] The first AC input subunit 11 includes a ~1A terminal 111, a ~1B terminal 112, a ~1C terminal 113, and a ~1N terminal 114. The input unit 1 adopts a two-layer staggered terminal layout, with the upper terminal corresponding to the first AC input subunit 11 and the lower terminal corresponding to the second AC input subunit 12. This two-layer staggered layout design can effectively increase the wiring operation space and avoid interference between the upper and lower terminal blocks and cables when operators connect or disconnect cables. At the same time, the layered layout makes the wiring path of the two AC inputs clearer, which is convenient for quick identification and operation on site.
[0027] The second AC input subunit 12 includes a ~2A / +DC terminal 121, a ~2B terminal 122, a ~2C / -DC terminal 123, and a ~2N terminal 124. Among them, the ~2A / +DC terminal 121 and the ~2C / -DC terminal 123 constitute a DC input circuit. AC input and DC input functions are realized through different terminals of the same subunit, eliminating the need for an additional independent DC input interface. This greatly simplifies the overall structure of the device, making the junction box small and portable. At the same time, the functional reuse design of the terminals also reduces redundant components and lowers the manufacturing cost of the device.
[0028] Output unit 5 includes ~A / +DC terminal 51, ~B terminal 52, ~C / -DC terminal 53, and ~N terminal 54. The output terminals are consistent with the input terminals and are designed to accommodate large-size cable connectors, allowing direct connection to the cable connectors of emergency generators, emergency chargers, or battery dischargers. This completely solves the problem of cables being unable to be connected due to the small size of the existing power supply panel terminals. The corresponding layout of the lower-level terminals of the output and input units allows for more organized cable routing, reduces cross-tangling, lowers the probability of wiring errors, and facilitates future cable maintenance and repair.
[0029] In addition, the terminal layout of input unit 1 and output unit 5 both follow the conventional wiring logic of power systems. ~A / +DC terminal 51, ~1A terminal 111, and ~2A / +DC terminal 121 correspond to the phase lines, ~N terminal 54, ~1N terminal 114, and ~2N terminal 124 correspond to the neutral lines, and ~C / -DC terminal 53 and ~2C / -DC terminal 123 correspond to the DC negative pole. The unified terminal marking and layout logic can reduce the learning cost for operators, improve wiring efficiency, and further ensure the safety and reliability of temporary power connection operations.
[0030] As an optional embodiment, this embodiment aims to realize the automatic switching and priority operation function of dual AC power sources, and improve the power supply continuity in temporary power supply scenarios.
[0031] The automatic switching unit 3 is connected between the same-phase terminals of the first AC input subunit 11 and the second AC input subunit 12, namely, between the ~1A terminal 111 and the ~2A / +DC terminal 121, the ~1B terminal 112 and the ~2B terminal 122, the ~1C terminal 113 and the ~2C / -DC terminal 123, and the ~1N terminal 114 and the ~2N terminal 124. At any given time, the automatic switching unit 3 only conducts one of the AC input subunits and the output unit 5. The automatic switching unit 3 uses a motor-type switching switch inside. This type of switch has the characteristics of rapid switching response and high stability. It can accurately realize the conflict-free switching of the two AC power supplies, avoid the circuit short circuit or equipment damage caused by the simultaneous conduction of the two power supplies, and ensure the safety and stability of the power supply circuit.
[0032] When both the first AC input subunit 11 and the second AC input subunit 12 are powered normally, the automatic switching unit 3 turns on the first AC input subunit 11; when the first AC input subunit 11 loses power and the second AC input subunit 12 is powered normally, the automatic switching unit 3 switches to turn on the second AC input subunit 12; when the first AC input subunit 11 is powered back, the automatic switching unit 3 automatically switches back to turn on the first AC input subunit 11. In the priority switching logic, the first AC input subunit 11 serves as the main power circuit, and the second AC input subunit 12 serves as the backup power circuit. The switching time of the switching switch is ≤2s, which can minimize the power interruption time and avoid the shutdown of terminal equipment due to untimely power switching. At the same time, the automatic switching function does not require manual intervention, which can effectively solve the problem of needing to manually switch the power and waiting for spare parts when the AC contactor fails in the prior art, making fault handling more efficient and significantly reducing the safety risks in temporary power supply scenarios.
[0033] As an optional embodiment, this embodiment aims to realize the phase sequence double-sided verification and safety interlocking function of AC circuit to avoid short circuit faults caused by incorrect phase sequence.
[0034] The AC phase sequence double-sided verification component 2 includes a phase sequence table 21, an AC input phase sequence verification button 22, and an AC output phase sequence verification button 23. The AC input phase sequence verification button 22 is connected in series to the AC circuit of the input unit 1, and the AC output phase sequence verification button 23 is connected in series to the AC circuit of the output unit 5. The output terminals of both are connected to the phase sequence table 21. Pressing the AC input phase sequence verification button 22 or the AC output phase sequence verification button 23 can trigger the phase sequence table 21 to perform phase sequence detection of the corresponding circuit. The phase sequence table determines the phase sequence by the rotation direction of the circular pointer. When the pointer rotates clockwise, it indicates that the circuit phase sequence is positive and meets the power supply requirements of the terminal equipment. When the pointer rotates counterclockwise, it indicates that the circuit phase sequence is negative. Direct power supply may cause the equipment to reverse, be damaged, or even cause a short circuit fault.
[0035] The AC input phase sequence check button 22 and the AC output phase sequence check button 23 are connected in series. The double-sided phase sequence check avoids short circuit faults caused by reverse phase sequence of AC input and output circuits. When the phase sequence is abnormal, the automatic switching unit 3 can be triggered to lock out. This series design requires that the circuit can only conduct normally after both the input and output circuits are detected to be in the correct phase sequence, forming a dual phase sequence protection. If reverse phase sequence is detected in either circuit, the AC phase sequence double-sided check component 2 will immediately send a signal to the automatic switching unit 3 to trigger its lockout function, preventing power output. The lockout state can only be released after the operator adjusts the phase sequence and re-verifies it to be qualified. This design eliminates the safety hazards caused by incorrect phase sequence from the source, making AC temporary power connection work safer and more reliable.
[0036] As an optional embodiment, this embodiment aims to realize the DC circuit voltage bilateral checking and short-circuit isolation functions to adapt to the access requirements of DC power equipment.
[0037] The DC voltage bilateral checking component 4 includes a voltmeter 41, a DC input voltage checking button 42, and a DC output voltage checking button 43. The DC input voltage checking button 42 is connected in series to the DC circuit of the second AC input subunit 12 of the input unit 1, and the DC output voltage checking button 43 is connected in series to the DC circuit of the output unit 5. Both outputs are connected to the voltmeter 41. Pressing either the DC input voltage checking button 42 or the DC output voltage checking button 43 triggers the voltmeter 41 to perform voltage detection on the corresponding circuit. The voltmeter 41 can display the voltage value of the detected circuit in real time. After connecting the DC power supply, the operator can press the DC input voltage checking button 42 to confirm whether the input voltage meets the rated voltage requirements of the terminal equipment, avoiding damage to the equipment due to excessively high or low voltage. Pressing the DC output voltage checking button 43 verifies whether the DC input and output circuit voltages are in phase, avoiding short circuit faults caused by out-of-phase DC input and output circuits. At the same time, the bilateral voltage checking design can also promptly detect problems such as loose circuit wiring and poor contact, facilitating rapid on-site troubleshooting.
[0038] The DC input voltage check button 42 and the DC output voltage check button 43 are connected in series. By checking the voltage on both sides, short circuit faults caused by the opposite phase of the DC input and output circuits can be avoided. When the phase is abnormal, the automatic switching unit 3 can be triggered to lock. The ~2A / +DC terminal 121 and the ~2C / -DC terminal 123 are isolated by the ~2B terminal 122, and the ~A / +DC terminal 51 and the ~C / -DC terminal 53 are isolated by the ~B terminal 52. The isolation avoids short circuit faults caused by accidental contact of the DC positive and negative terminals. The isolation design separates the DC positive and negative terminals by physical distance, which can effectively prevent short circuit faults caused by accidental contact of the DC positive and negative terminals by operators during wiring or maintenance. It can also avoid short circuits caused by accidental situations such as foreign objects falling, further improving the safety of temporary DC power connection and adapting to scenarios with extremely high safety requirements such as the maintenance of DC systems in substations.
[0039] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.
Claims
1. A power grid-adaptive multi-functional temporary junction box, characterized in that: include, The input unit (1) includes a first AC input subunit (11) and a second AC input subunit (12). The first AC input subunit (11) is used to connect to a first AC power source, and the second AC input subunit (12) is used to connect to a second AC power source and also serves as a DC input circuit. Output unit (5), the output unit (5) is used to output AC and DC power; Automatic switching unit (3), which is connected between input unit (1) and output unit (5), is used to switch between two AC power sources; AC phase sequence double-sided verification component (2) and DC voltage double-sided verification component (4); among which, The AC phase sequence double-sided verification component (2) is connected in series to the AC circuit of the input unit (1) and the output unit (5) for AC phase sequence verification; the DC voltage double-sided inspection component (4) is connected in series to the DC circuit of the input unit (1) and the output unit (5) for DC voltage inspection. The AC subunit of the input unit (1) is designed to be insulated from the DC circuit, and the temporary power connection function of AC and DC power supply is realized through the cooperation of each unit.
2. The power grid-adaptive multifunctional temporary junction box according to claim 1, characterized in that: The first AC input subunit (11) includes a ~1A terminal (111), a ~1B terminal (112), a ~1C terminal (113), and a ~1N terminal (114); wherein, the input unit (1) adopts a two-layer staggered terminal layout, with the upper terminal corresponding to the first AC input subunit (11) and the lower terminal corresponding to the second AC input subunit (12).
3. The power grid-adaptive multifunctional temporary junction box according to claim 2, characterized in that: The second AC input subunit (12) includes a ~2A / +DC terminal (121), a ~2B terminal (122), a ~2C / -DC terminal (123), and a ~2N terminal (124); wherein the ~2A / +DC terminal (121) and the ~2C / -DC terminal (123) constitute a DC input circuit.
4. The power grid-adaptive multifunctional temporary junction box according to claim 3, characterized in that: The output unit (5) includes a ~A / +DC terminal (51), a ~B terminal (52), a ~C / -DC terminal (53), and a ~N terminal (54); wherein, The ~A / +DC terminal (51) and ~C / -DC terminal (53) constitute a DC output circuit. The output unit (5) adopts a lower terminal block arrangement, which corresponds to the lower terminal block arrangement of the input unit (1).
5. The power grid-adaptive multifunctional temporary junction box according to claim 4, characterized in that: The automatic switching unit (3) is connected between the same phase terminals of the first AC input subunit (11) and the second AC input subunit (12), namely between the ~1A terminal (111) and the ~2A / +DC terminal (121), the ~1B terminal (112) and the ~2B terminal (122), the ~1C terminal (113) and the ~2C / -DC terminal (123), and the ~1N terminal (114) and the ~2N terminal (124). The automatic switching unit (3) can only conduct one AC input subunit and the output unit (5) at any given time.
6. The power grid-adaptive multi-functional temporary junction box according to claim 5, characterized in that: When both the first AC input subunit (11) and the second AC input subunit (12) are powered normally, the automatic switching unit (3) turns on the first AC input subunit (11). When the first AC input subunit (11) loses power and the second AC input subunit (12) is powered normally, the automatic switching unit (3) switches to turn on the second AC input subunit (12). When the first AC input subunit (11) is powered back, the automatic switching unit (3) automatically switches back and turns on the first AC input subunit (11).
7. The power grid-adaptive multifunctional temporary junction box according to claim 6, characterized in that: The AC phase sequence double-sided verification component (2) includes a phase sequence table (21), an AC incoming phase verification button (22), and an AC outgoing phase verification button (23). The AC input phase detection button (22) is connected in series to the AC circuit of the second AC input subunit (12) of the input unit (1), and the AC output phase detection button (23) is connected in series to the AC circuit of the output unit (5). The output terminals of both are connected to the phase sequence table (21). Pressing the AC incoming phase check button (22) or the AC outgoing phase check button (23) will trigger the phase sequence table (21) to perform phase sequence detection of the corresponding circuit.
8. The power grid-adaptive multifunctional temporary junction box according to claim 7, characterized in that: The AC input phase check button (22) and the AC output phase check button (23) are connected in series. By checking the phases on both sides, the short circuit fault caused by the opposite phase sequence of the AC input and output circuits can be avoided. When the phase sequence is abnormal, the automatic switching unit (3) can be triggered to lock.
9. The power grid-adaptive multifunctional temporary junction box according to claim 8, characterized in that: The DC voltage bilateral inspection component (4) includes a voltmeter (41), a DC input voltage inspection button (42), and a DC output voltage inspection button (43). The DC input voltage check button (42) is connected in series to the DC circuit of the second AC input subunit (12) of the input unit (1), and the DC output voltage check button (43) is connected in series to the DC circuit of the output unit (5). The output terminals of both are connected to the voltmeter (41). Pressing the DC input voltage check button (42) or the DC output voltage check button (43) will trigger the voltmeter (41) to perform the corresponding circuit voltage detection.
10. The power grid-adaptive multifunctional temporary junction box according to claim 9, characterized in that: The DC input voltage check button (42) and the DC output voltage check button (43) are connected in series. By checking the voltage on both sides, the short circuit fault caused by the opposite phase of the DC input and output circuits can be avoided. When the phase is abnormal, the automatic switching unit (3) can be triggered to lock. The ~2A / +DC terminal (121) and the ~2C / -DC terminal (123) are isolated by the ~2B terminal (122). The ~A / +DC terminal (51) and the ~C / -DC terminal (53) are isolated by the ~B terminal (52). The isolation avoids the short circuit fault caused by the accidental contact of the DC positive and negative terminals.