Pre-debugging detection device before power-on of power distribution unit

Abstract

The utility model discloses a pre-debugging detection device before power-on of a power supply distribution unit, which is characterized in that a rectification unit converts single-phase alternating current into direct current, an inversion unit converts the direct current into three-phase four-wire system alternating current and provides the alternating current for the power supply distribution unit to be detected, and when a loop in the power supply distribution unit to be detected is abnormal, the power supply distribution unit is powered on. The inversion unit stops outputting, the phase sequence detection unit detects whether the phase sequence of the main bus in the to-be-detected power distribution unit is correct, and if the phase sequence is correct, the main bus is correctly installed; in the process of supplying power to the main bus of the PDU, if the power-on is abnormal, the inverter unit stops outputting, the detection device performs rapid protection, and bus faults can be checked in a focused manner subsequently; in the process of supplying power to the secondary loop of the PDU, the interlocking installation and wiring correctness of the PDU can be tested. Compared with detection after normal power-on of the PDU, the detection efficiency can be improved, the probability of short circuit occurrence is reduced, and the risk that the PDU is damaged is reduced; in addition, the device is portable, small in size and light in weight.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply detection, in particular to a pre-debugging detection device for a power distribution unit before power-on. Background Art

[0002] With the rapid development of artificial intelligence technology, a large number of data centers based on computing power are being built, and power distribution units (PDUs) are being deployed and used in large numbers in data centers.

[0003] PDU is used to power the equipment in the data center. However, in the prior art, the detection of whether there is an abnormality in the PDU and whether the phase sequence of the upper and lower ends of the bus tie switch is correct requires detection after power-on. Whether there is an abnormality in the PDU, such as the quality of the interlocking installation, whether the secondary circuit wiring is correct, and whether there is a short circuit in the primary circuit, detection after power-on has low detection efficiency. If there is a short circuit in the main bus in the primary circuit, the PDU may be damaged. Utility Model Content

[0004] The utility model provides a pre-debugging detection device for a power distribution unit before power-on, which is used to solve the problem in the prior art that the PDU is detected after formal power-on, the detection efficiency is low, and there may be a risk of PDU being damaged.

[0005] The utility model provides a pre-commissioning detection device for a power distribution unit before power-on, comprising: an input end, a rectifier unit, an inverter unit, a phase sequence detection unit and at least two output ends;

[0006] The input end is electrically connected to the input end of the rectifier unit, and each output end is electrically connected to the output end of the inverter unit;

[0007] The rectifier unit is used to convert the single-phase alternating current input through the input end into direct current;

[0008] The inverter unit is used to convert the direct current into three-phase four-wire alternating current, and provide the three-phase four-wire alternating current to the power distribution unit to be detected through the at least one output terminal, and stop outputting the three-phase four-wire alternating current when an abnormality occurs in the circuit of the power distribution unit to be detected;

[0009] The first input end of the phase sequence detection unit is electrically connected to the first end of the bus tie switch connected to the main bus in the power distribution unit to be detected, and the second end of the phase sequence detection unit is electrically connected to the second end of the bus tie switch. The phase sequence detection unit is used to detect whether the phase sequence of the main bus is correct during the process in which the inverter unit provides the three-phase four-wire alternating current to the distribution unit to be detected.

[0010] In a possible implementation, it further includes an input switch unit;

[0011] One end of the input switch unit is electrically connected to the input end, and the other end of the input switch unit is electrically connected to the input end of the rectifier unit.

[0012] In a possible implementation, an isolation transformer is also included;

[0013] The primary side of the isolation transformer is electrically connected to the output end of the inverter unit, and the secondary side of the isolation transformer is electrically connected to each output end.

[0014] In a possible implementation, it further includes a branch switch corresponding to each output terminal;

[0015] For any group of branch switches and output ends, one end of the branch switch is electrically connected to the secondary side of the isolation transformer, and the other end of the branch switch is electrically connected to the output end.

[0016] In a possible implementation, it also includes a fuse corresponding to the branch switch;

[0017] One end of the fuse is electrically connected to the other end of the branch switch, and the other end of the fuse is electrically connected to the output end.

[0018] In a possible implementation, the phase sequence detection unit includes a phase detector;

[0019] The first input terminal of the phase check instrument is electrically connected to the first phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the first phase of the second terminal of the bus tie switch; or

[0020] The first input terminal of the phase check instrument is electrically connected to the second phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the second phase of the second terminal of the bus tie switch; or

[0021] The first input terminal of the phase check instrument is electrically connected to the third phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the third phase of the second terminal of the bus tie switch.

[0022] In a possible implementation, the rectifying unit includes a first diode, a second diode, a third diode and a fourth diode;

[0023] The anode of the first diode is electrically connected to the cathode of the second diode and serves as a first input terminal of the rectifying unit, and the cathode of the first diode is electrically connected to the cathode of the third diode and serves as a first output terminal of the rectifying unit;

[0024] The anode of the second diode is electrically connected to the anode of the fourth diode and serves as the second output terminal of the rectifying unit;

[0025] The anode of the third diode is electrically connected to the cathode of the fourth diode and serves as the second input terminal of the rectifying unit.

[0026] In a possible implementation, the inverter unit includes an inverter controller, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, and a twelfth switch tube;

[0027] The first end of the first switch tube is electrically connected to the first end of the third switch tube and the first end of the fifth switch tube, and serves as the first input end of the inverter unit, and the second end of the first switch tube is electrically connected to the first end of the second switch tube;

[0028] The second end of the second switch tube is electrically connected to the second end of the seventh switch tube and the first end of the eighth switch tube, and serves as the first output end of the inverter unit;

[0029] The second end of the third switch tube is electrically connected to the first end of the fourth switch tube;

[0030] The second end of the fourth switch tube is electrically connected to the second end of the ninth switch tube and the first end of the tenth switch tube, and serves as the second output end of the inverter unit;

[0031] The second end of the fifth switch tube is electrically connected to the first end of the sixth switch tube;

[0032] The second end of the sixth switch tube is electrically connected to the second end of the eleventh switch tube and the first end of the twelfth switch tube, and serves as the third output end of the inverter unit;

[0033] The first end of the seventh switch tube is electrically connected to the first end of the ninth switch tube and the first end of the eleventh switch tube, and serves as the second input end of the inverter unit;

[0034] The second end of the eighth switch tube is electrically connected to the second end of the tenth switch tube and the second end of the twelfth switch tube, and serves as the third input end of the inverter unit.

[0035] In a possible implementation, a buffer unit is also included;

[0036] The buffer unit is connected between the first output end of the rectifying unit and the second input end of the inverter unit, and is used to divide the input voltage when the input voltage is unstable.

[0037] In a possible implementation, the buffer unit includes a charging resistor and a switch;

[0038] The first end of the charging resistor is electrically connected to the first end of the switch, serving as the first end of the buffer circuit. The second end of the charging resistor is electrically connected to the second end of the switch, serving as the second end of the buffer circuit.

[0039] In a possible implementation, it further includes a filtering unit;

[0040] The filtering unit is connected between the inverter unit, the rectifying unit and the buffer unit, and is used for filtering the direct current output by the rectifying unit.

[0041] In a possible implementation, the filtering unit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first inductor, a second inductor, a thirteenth switch tube, a fourteenth switch tube, a fifth diode, a sixth diode, a seventh diode and an eighth diode;

[0042] The first end of the first capacitor is electrically connected to the first end of the first inductor, the anode of the fifth diode and the second end of the charging resistor, and the second end of the first capacitor is electrically connected to the second end of the thirteenth switch tube, the first end of the fourteenth switch tube, the second end of the second capacitor, the first end of the third capacitor, the second end of the first resistor, the first end of the second resistor and the first input end of the inverter unit;

[0043] The second end of the first inductor is electrically connected to the first end of the thirteenth switch tube and the anode of the sixth diode;

[0044] The cathode of the fifth diode is electrically connected to the cathode of the sixth diode, the first end of the second capacitor, the first end of the first resistor and the second input end of the inverter unit;

[0045] The first end of the second inductor is electrically connected to the cathode of the eighth diode and the second output end of the rectifier unit, and the second end of the second inductor is electrically connected to the second end of the fourteenth switch tube and the cathode of the seventh diode;

[0046] An anode of the seventh diode is electrically connected to an anode of the eighth diode, a second end of the third capacitor, a second end of the second resistor, and a third input end of the inverter unit.

[0047] The beneficial effects of the utility model are as follows:

[0048] The utility model provides a pre-debugging detection device for a power distribution unit. First, a single-phase AC is converted into DC through a rectifier unit, and then the DC is converted into three-phase four-wire AC through an inverter unit, and the converted three-phase four-wire AC is provided to the power distribution unit to be detected. When there is an abnormality in the circuit of the power distribution unit to be detected, the inverter unit stops outputting the three-phase four-wire AC, and the phase sequence detection unit is used to detect whether the phase sequence of the main bus in the power distribution unit to be detected is correct. If the phase sequence is correct, it means that the main bus is installed correctly; in the process of supplying power to the main bus of the PDU, if the power-on is abnormal, the inverter unit stops outputting the three-phase four-wire AC, and the detection device quickly protects, and the bus fault can be focused on in the subsequent investigation; in the process of supplying power to the secondary circuit of the PDU, the interlocking installation and wiring correctness of the PDU can be tested. Compared with the detection after the PDU is normally powered on, the detection efficiency can be improved, the probability of short-circuit accidents can be reduced, and the risk of PDU being damaged can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic diagram of the structure of a pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0051] Figure 2 A schematic diagram of a 2N structure of a power distribution system provided for related technology;

[0052] Figure 3 A simplified structural diagram of a primary circuit in a PDU provided for related technology;

[0053] Figure 4 A simplified structural diagram of a primary circuit in another PDU provided for related technology;

[0054] Figure 5 A simplified structural diagram of a secondary circuit in a PDU provided for related technology;

[0055] Figure 6 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0056] Figure 7 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0057] Figure 8 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0058] Fig. 9 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0059] Fig.10 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0060] Fig.11 A schematic diagram of the structure of another pre-power-on pre-debugging detection device for a power distribution unit provided by an embodiment of the utility model;

[0061] Fig.12 A schematic structural diagram of another pre-power-on pre-debugging detection device for a power distribution unit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0063] Currently, the PDU needs to be powered on normally to check whether the switch interlocking of the PDU, whether the wiring is correct, and whether there is a short circuit. However, the detection efficiency is low when the switch interlocking installation, wiring, and short circuit in the PDU are checked after normal power-on, and there is a risk of damaging the PDU.

[0064] Based on the above problems, the present invention provides a pre-power-on pre-debugging detection device for a power distribution unit. Figure 1 As shown, it includes: an input end (AC~220V), a rectifier unit 11, an inverter unit 12, a phase sequence detection unit 13 and at least two output ends (A1, A2, A3, ..., An, Bn, Cn), where n is a positive integer greater than or equal to 2;

[0065] The input end is electrically connected to the input end of the rectifier unit 11, and each output end is electrically connected to the output end of the inverter unit 12;

[0066] The rectifier unit 11 is used to convert the single-phase AC power input through the input terminal into DC power;

[0067] The inverter unit 12 is used to convert direct current into three-phase four-wire alternating current, and provide the three-phase four-wire alternating current to the power distribution unit to be detected through at least one output terminal, and stop outputting the three-phase four-wire alternating current when there is an abnormality in the circuit of the power distribution unit to be detected;

[0068] The first input end of the phase sequence detection unit 13 is electrically connected to the first end of the bus tie switch connected to the main bus in the power distribution unit to be detected, and the second end of the phase sequence detection unit 13 is electrically connected to the second end of the bus tie switch. The phase sequence detection unit 13 is used to detect whether the phase sequence of the main bus is correct when the inverter unit 12 provides three-phase four-wire alternating current to the distribution unit to be detected.

[0069] The pre-commissioning detection device for power distribution unit before power on provided by the embodiment of the utility model first converts single-phase AC into DC through the rectifier unit, then converts DC into three-phase four-wire AC through the inverter unit, and provides the converted three-phase four-wire AC to the power distribution unit to be detected. When there is an abnormality in the circuit of the power distribution unit to be detected, the inverter unit stops outputting three-phase four-wire AC, and detects whether the phase sequence of the main bus in the power distribution unit to be detected is correct through the phase sequence detection unit. If the phase sequence is correct, it means that the main bus is installed correctly; in the process of supplying power to the main bus of the PDU, if the power on is abnormal, the inverter unit stops outputting three-phase four-wire AC, the detection device quickly protects, and the bus fault can be focused on in the future; in the process of supplying power to the secondary circuit of the PDU, the interlocking installation and wiring correctness of the PDU can be tested. Compared with the detection after the PDU is normally powered on, the detection efficiency can be improved, the probability of short circuit accidents can be reduced, and the risk of PDU damage can be reduced.

[0070] In addition, the detection device has the characteristics of small size, portability and light weight.

[0071] In an embodiment of the utility model, the inverter unit provides three-phase four-wire alternating current to the power distribution unit to be detected, and can provide three-phase four-wire alternating current for the main bus of the power distribution unit to be detected, and can also provide three-phase four-wire alternating current for the secondary circuit of the power distribution unit to be detected. The circuit formed by the main bus in the power distribution unit can be called a primary circuit, and the control circuit in the power distribution unit can be called a secondary circuit. The power distribution unit is explained below.

[0072] In related technologies, PDUs usually adopt a 2N structure mode, which usually includes "two incoming lines and one busbar switch" with electrical and mechanical interlocks. Whether the PDU interlock is installed properly and whether the wiring is correct depends on post-power-on debugging. Passive debugging and detection are inefficient, and when problems occur, engineers have few support resources and high processing pressure.

[0073] like Figure 2 As shown, the 2N structure power distribution system includes PDU1, PDU2, PDU3, load 1 and load 2. PDU2 and PDU3 each include one input terminal, and PDU1 includes two input terminals. The primary circuit in the PDU including one input terminal is as shown in FIG. Figure 3 As shown, the primary circuit of the PDU including two input terminals is as follows Figure 4 As shown, the secondary circuits in the PDU with one input terminal and the PDU with two input terminals are as follows Figure 5 As shown in FIG. 1 , when a PDU including one input terminal is tested, since the PDU does not include a bus tie switch, it is not necessary to test whether the main bus phase sequence is correct. At this time, only one phase of the three-phase four-wire AC power converted by the inverter unit is connected to the Figure 5 The power supply end (L12 and N) of the secondary circuit is electrically connected. If the inverter unit outputs three-phase four-wire AC power normally, it is determined that the interlocking installation is correct and the secondary circuit is connected correctly. If the inverter unit stops outputting three-phase four-wire AC power, it is determined that the interlocking installation is wrong and the secondary circuit is connected incorrectly. Notify the staff to check.

[0074] If the PDU includes two input terminals, such as Figure 4 As shown, it is a simplified structural diagram of a primary circuit of a PDU provided by the related technology. Figure 4 The PDU shown in the figure includes two input terminals, namely, 1#AC input terminal and 2#AC input terminal. In actual applications, 1#AC input terminal and 2#AC input terminal can both be AC ​​input, or one of them can be AC ​​input and the other can be input by a diesel generator. For the PDU including two input terminals, it includes two incoming line switches and one bus tie switch, and the two incoming line switches and one bus tie switch are both arranged on the main bus.

[0075] When the detection device provided by the embodiment of the utility model is used to detect the primary circuit of the PDU, the detection device may include two groups of output terminals (A1, B1, C1 and A2, B2, C2). When the detection device provided by the embodiment of the utility model is used to detect the PDU, the output terminals A1, B1 and C1 of the detection device are connected to Figure 4 Connect the 1#A input terminal in the detection device to the output terminals A2, B2 and C2 of the detection device. Figure 4 The 2# AC input terminal of the bus tie switch is connected, the first end of the bus tie switch is connected to the first input terminal of the phase sequence detection unit 13, and the second end of the bus tie switch is connected to the second input terminal of the phase sequence detection unit 13.

[0076] After the above connection is completed, close the incoming line switch 1 and the incoming line switch 2, and the three-phase four-wire AC power is input into the 1# AC input terminal of the PDU through A1, B1 and C1, and is input into the 2# AC input terminal of the PDU through A2, B2 and C2. After the two input terminals of the PDU are input with three-phase four-wire AC power, the three-phase four-wire AC current input from the 1# AC input terminal is sent to the first terminal of the bus tie switch, i.e., 3L21, 3L22 and 3L23, and the three-phase four-wire AC current input from the 2# AC input terminal is sent to the second terminal of the bus tie switch, i.e., 3L11, 3L12 and 3L13. The phase sequence detection unit 13 detects whether the phase sequences of 3L21 and 3L11 are the same, whether the phase sequences of 3L22 and 3L12 are the same, and whether the phase sequences of 3L23 and 3L13 are the same. If the detected phase sequences are the same, it is determined that the phase sequence of the main bus is correct.

[0077] In one embodiment, if Figure 6 As shown, the detection device provided in the embodiment of the present application may also include an input switch unit 14, one end of the input switch unit 14 is electrically connected to the input end of the pre-debugging detection device before power-on of the power distribution unit, and the other end of the input switch unit 14 is electrically connected to the input end of the rectifier unit 11.

[0078] from Figure 6 It can be seen that the input switch unit 14 includes a switch connected between the live wire input terminal and the rectifier unit 11, and a switch connected between the neutral wire input terminal and the rectifier unit 11. When both switches are closed, the input single-phase AC current enters the rectifier unit 11.

[0079] In a specific implementation, the input switch unit 14 may include a switch, which can be connected between the live wire input terminal and the rectifier unit 11, or between the neutral wire input terminal and the rectifier unit 11. When the switch is closed, the input single-phase AC current enters the rectifier unit 11.

[0080] The input switch unit 14 in the embodiment of the present application acts as a main switch of the detection device. When the input switch unit 14 is closed, the subsequent stage of the detection device is powered on, and when the input switch unit 14 is opened, the subsequent stage of the detection device is powered off.

[0081] In one embodiment, if Figure 7 As shown, the detection device provided in the embodiment of the present application may further include an isolation transformer 15;

[0082] The primary side of the isolation transformer 15 is electrically connected to the output end of the inverter unit 12, and the secondary side of the isolation transformer 15 is electrically connected to the output end of the pre-debugging detection device of the power distribution unit before power-on, outputting three-phase four-wire AC power A, B and C and N phases (N phase is not drawn in the figure).

[0083] The isolation transformer 15 has an isolation function, isolating the inverter unit 12 and the power distribution unit to be detected, and has a protection function.

[0084] In the specific implementation, Figure 8 The detection device provided in the embodiment of the present application may further include a branch switch corresponding to each group of output terminals;

[0085] For any set of branch switches and output terminals, one end of the branch switch is electrically connected to the secondary side of the isolation transformer 15, and the other end of the branch switch is electrically connected to the output terminal.

[0086] For example, one end of the branch switch 161 is electrically connected to the secondary side of the isolation transformer 15 , and the other end of the branch switch 161 is electrically connected to the output terminals A1 , B1 , and C1 .

[0087] In the embodiment of the utility model, when providing power to the secondary circuit of the PDU, any branch switch can be selected to be closed. For example, by closing the branch switch 161, any phase among A1, B1 and C1 and the N phase can be used to provide power to the secondary circuit of the PDU. For another example, by closing the branch switch 16n, any phase among An, Bn and Cn and the N phase can be used to provide power to the secondary circuit of the PDU.

[0088] When supplying power to the primary circuit of the PDU, you can choose to close any two branch switches therein. For example, by closing branch switch 161 and branch switch 16n, you can use A1, B1, C1 and N to provide power to the 1# AC input terminal of the PDU, and use An, Bn, Cn and N to provide power to the 2# AC input terminal of the PDU.

[0089] In one embodiment, the detection device may further include a fuse corresponding to each phase sequence of each output terminal, and for each fuse, a first end of the fuse is electrically connected to a branch switch, and a second end of the fuse is electrically connected to the phase sequence corresponding to the fuse.

[0090] like Fig. 9 As shown, the detection device also includes insurance F11, insurance F12, insurance F13, ... insurance Fn1, insurance Fn2 and insurance Fn3, insurance F11 is connected between the branch switch 161 and the phase sequence output terminal A1, insurance F12 is connected between the branch switch 161 and the phase sequence output terminal B1, insurance F13 is connected between the branch switch 161 and the phase sequence output terminal C1, ... insurance Fn1 is connected between the branch switch 16n and the phase sequence output terminal An, insurance Fn2 is connected between the branch switch 16n and the phase sequence output terminal Bn, and insurance Fn3 is connected between the branch switch 16n and the phase sequence output terminal Cn.

[0091] In the embodiment of the present application, the fuse plays a protective role. When a short circuit fault occurs, the fuse blows quickly and the detection device stops outputting.

[0092] In one embodiment, the phase sequence detection unit 13 can be a phase checker, a first input terminal of the phase checker is electrically connected to the first phase of the first end of the bus tie switch, and a second terminal of the phase checker is electrically connected to the first phase of the second end of the bus tie switch; or the first input terminal of the phase checker is electrically connected to the second phase of the first end of the bus tie switch, and the second terminal of the phase checker is electrically connected to the second phase of the second end of the bus tie switch; or the first input terminal of the phase checker is electrically connected to the third phase of the first end of the bus tie switch, and the second terminal of the phase checker is electrically connected to the third phase of the second end of the bus tie switch.

[0093] In the specific implementation, Fig.10 As shown, the nuclear phase instrument usually includes two input terminals, namely Fig.10 The first input terminal "1" and the second input terminal "2" in the phase analyzer 131, the detection device provided by the embodiment of the utility model may include one phase analyzer or three phase analyzers, such as Fig.11 As shown, when a phase checker is included, each phase at both ends of the bus tie switch is manually plugged in and out. For example, 3L11 at the first end of the bus tie switch is electrically connected to the first input terminal "1" of the phase checker 131, and 3L21 at the second end of the bus tie switch is electrically connected to the second input terminal "2" of the phase checker 131 to detect whether the phase sequence of 3L11 at the first end of the bus tie switch and 3L21 at the second end of the bus tie switch are the same. If they are the same, the "Compliance" display light of the phase checker 131 is turned on, and then 3L12 at the first end of the bus tie switch is electrically connected to the first input terminal "1" of the phase checker 131, and 3L21 at the second end of the bus tie switch is electrically connected to the second input terminal "2" of the phase checker 131. 22 is electrically connected to the second input terminal "2" of the phase check instrument 131 to detect whether the phase sequence of 3L12 at the first end of the main coupling switch and 3L22 at the second end of the main coupling switch is the same. If they are the same, the "Compliance" display light of the phase check instrument 131 is lit. Finally, 3L13 at the first end of the main coupling switch is electrically connected to the first input terminal "1" of the phase check instrument 131, and 3L23 at the second end of the main coupling switch is electrically connected to the second input terminal "2" of the phase check instrument 131 to detect whether the phase sequence of 3L13 at the first end of the main coupling switch and 3L23 at the second end of the main coupling switch is the same. If they are the same, the "Compliance" display light of the phase check instrument 131 is lit.

[0094] After the phase checker is powered on, the indicator light corresponding to "self-test" flashes and the phase checker enters the detection mode. If the phase sequence is the same, the indicator light corresponding to "compliant" on the phase checker lights up. If the phase sequence is different, the indicator light corresponding to "compliant" will not light up. If one phase is not energized, the indicator light corresponding to "error" will light up, accompanied by a buzzer sound, indicating that the phase check conditions do not meet the requirements.

[0095] like Fig.11 As shown, if the detection device includes three phase checkers, namely phase checker 132, phase checker 133 and phase checker 134, the first input terminal "1" of the phase checker 132 is electrically connected to 3L11 of the first end of the bus tie switch, and the second input terminal "2" of the phase checker 132 is electrically connected to 3L21 of the second end of the bus tie switch, and the phase checker 132 detects whether the phase sequence of 3L11 and 3L21 is the same;

[0096] The first input terminal "1" of the phase checker 133 is electrically connected to 3L12 of the first terminal of the bus tie switch, and the second input terminal "2" of the phase checker 133 is electrically connected to 3L22 of the second terminal of the bus tie switch. The phase checker 133 detects whether the phase sequence of 3L12 and 3L22 is the same;

[0097] The first input terminal "1" of the phase checker 134 is electrically connected to 3L13 of the first terminal of the bus tie switch, and the second input terminal "2" of the phase checker 134 is electrically connected to 3L23 of the second terminal of the bus tie switch. The phase checker 134 detects whether the phase sequence of 3L13 and 3L23 is the same;

[0098] In the embodiment of the present application, if the detection results of phase checker 132, phase checker 133 and phase checker 134 all indicate that the phase sequence is correct, then the phase sequence of the three-phase four-wire alternating current is determined to be correct; if the detection result of one of the phase checkers indicates that the phase sequence is incorrect, then the phase sequence of the three-phase four-wire alternating current is determined to be incorrect.

[0099] It should be noted that, in order to make the detection more accurate, after the switch in the input switch unit of the closing detection device is closed, the switch in the branch switch unit is closed after 1 minute.

[0100] In one embodiment, if Fig.12 As shown, the detection device provided by the present novel embodiment may further include a buffer unit 17,

[0101] The buffer unit 17 is connected between the first output terminal of the rectifying unit 11 and the second input terminal of the inverter unit 12, and is used to divide the input voltage when the input voltage is unstable.

[0102] like Fig.12 As shown, the detection device provided in the embodiment of the present application may also include a filtering unit 18, such as Fig.12 As shown;

[0103] The filter unit 18 is connected between the inverter unit 12 , the rectifier unit 11 and the buffer unit 17 , and is used for filtering the direct current output by the rectifier unit 18 .

[0104] Combine the following Fig.12 , the specific structures of the rectifying unit 11, the inverting unit 12, the buffer unit 17 and the filtering unit 18 are described in detail.

[0105] The rectifier unit provided in the embodiment of the utility model may be a PFC rectifier circuit. Fig.12 As shown, the rectifying unit 11 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4;

[0106] The anode of the first diode D1 is electrically connected to the cathode of the second diode D2 and serves as a first input terminal of the rectifying unit 11, and the cathode of the first diode D1 is electrically connected to the cathode of the third diode D3 and serves as a first output terminal of the rectifying unit 11;

[0107] The anode of the second diode D2 is electrically connected to the anode of the fourth diode D4 and serves as the second output terminal of the rectifying unit 11;

[0108] An anode of the third diode D3 is electrically connected to a cathode of the fourth diode D4 and serves as a second input terminal of the rectifying unit 11 .

[0109] like Fig.12 As shown, the inverter unit 12 includes an inverter controller (not shown in the figure), a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11 and a twelfth switch tube Q12;

[0110] The first end of the first switch tube Q1 is electrically connected to the first end of the third switch tube Q3 and the first end of the fifth switch tube Q5, and serves as the first input end of the inverter unit 12. The second end of the first switch tube Q1 is electrically connected to the first end of the second switch tube Q2.

[0111] The second end of the second switch tube Q2 is electrically connected to the second end of the seventh switch tube Q7 and the first end of the eighth switch tube Q8, and serves as the first output end of the inverter unit 12;

[0112] The second end of the third switch tube Q3 is electrically connected to the first end of the fourth switch tube Q4;

[0113] The second end of the fourth switch tube Q4 is electrically connected to the second end of the ninth switch tube Q9 and the first end of the tenth switch tube Q10, and serves as the second output end of the inverter unit 12;

[0114] The second end of the fifth switch tube Q5 is electrically connected to the first end of the sixth switch tube Q6;

[0115] The second end of the sixth switch tube Q6 is electrically connected to the second end of the eleventh switch tube Q11 and the first end of the twelfth switch tube Q12, and serves as the third output end of the inverter unit 12;

[0116] The first end of the seventh switch tube Q7 is electrically connected to the first end of the ninth switch tube Q9 and the first end of the eleventh switch tube Q11, and serves as the second input end of the inverter unit 12;

[0117] The second end of the eighth switch tube Q8 is electrically connected to the second end of the tenth switch tube Q10 and the second end of the twelfth switch tube Q12 , and serves as the third input end of the inverter unit 12 .

[0118] like Fig.12 As shown, the buffer unit 17 includes a charging resistor R and a switch K;

[0119] A first end of the charging resistor R is electrically connected to a first end of the switch K, serving as a first end of the buffer unit, and a second end of the charging resistor R is electrically connected to a second end of the switch K, serving as a second end of the buffer unit.

[0120] When the input voltage is in a stable state, switch K is closed. When the input voltage is unstable, especially when the input voltage is too large, switch K is opened, thereby dividing the charging voltage and reducing the impact of the input voltage on the devices in the inverter unit.

[0121] like Fig.12 As shown, the filtering unit 18 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a first inductor L1, a second inductor L2, a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8;

[0122] The first end of the first capacitor C1 is electrically connected to the first end of the first inductor L1, the anode of the fifth diode D5 and the second end of the charging resistor R, and the second end of the first capacitor C1 is electrically connected to the second end of the thirteenth switch tube Q13, the first end of the fourteenth switch tube Q14, the second end of the second capacitor C2, the first end of the third capacitor C3, the second end of the first resistor R1, the first end of the second resistor R2 and the first input end of the inverter unit 12;

[0123] The second end of the first inductor L1 is electrically connected to the first end of the thirteenth switch tube Q13 and the anode of the sixth diode D6;

[0124] The cathode of the fifth diode D5 is electrically connected to the cathode of the sixth diode D6, the first end of the second capacitor C2, the first end of the first resistor R1 and the second input end of the inverter unit 12;

[0125] The first end of the second inductor L2 is electrically connected to the cathode of the eighth diode D8 and the second output end of the rectifier unit 11, and the second end of the second inductor L2 is electrically connected to the second end of the fourteenth switch tube Q14 and the cathode of the seventh diode D7;

[0126] An anode of the seventh diode D7 , an anode of the eighth diode D8 , a second end of the third capacitor C3 , a second end of the second resistor R2 , and a third input end of the inverter unit 12 are electrically connected.

[0127] like Fig.12 As shown, a power distribution unit pre-power-on and debugging detection device provided by an embodiment of the utility model may also include a fuse F2 and a fuse F3, the fuse F2 is connected between the live wire input terminal and the input switch unit, and the fuse F3 is connected between the neutral wire input terminal and the input switch unit.

[0128] In the embodiment of the present application, the fuse plays a protective role. When a short circuit fault occurs, the fuse blows quickly and the detection device stops outputting.

[0129] The pre-debugging detection device for the power distribution unit provided by the embodiment of the utility model converts single-phase AC into three-phase four-wire AC, that is, AC→DC→AC conversion. The microprocessor in the inverter unit can be used as the core to control the devices in the inverter unit in MPWM mode. Digital frequency division, D / A conversion, instantaneous value feedback, sinusoidal pulse width modulation and other technologies can be used to increase the power of a single machine to 2W~10KW. The output of the isolation transformer is used to increase the stability of the whole machine. The inverter controller in the inverter unit has short circuit, overcurrent, overload, overheating and other protection functions to ensure reliable operation of the power supply, and outputs a standard sine wave, that is, three-phase four-wire AC. The phase angle of the three-phase four-wire AC is 120°, and the harmonic distortion rate is less than 2%, which meets the national three-phase power quality standards, and the power supply phase-to-phase voltage is 380V. At least two outputs are connected in parallel, and each phase is equipped with a fast-fuse fuse. If the rear-end load is short-circuited, the fast-fuse fuse will blow, or the branch switch will trip, or the device will terminate the output prematurely for protection. If the fuse blows, it is easy to replace with low cost.

[0130] The detection device in the embodiment of the utility model has a power of up to 2W to 10KW, thereby achieving a small current output. When a PDU fails, the small current will not damage the PDU.

[0131] The phase sequence detection unit in the detection device quickly detects whether the phase sequence of the two connected signals is correct by judging the angle difference of the phase angles of the two connected signals. If incorrect, it prompts a phase sequence error. Specifically, when the angle difference is less than or equal to the preset angle, it is determined to be in phase, that is, the phases are the same. When the angle difference is greater than the preset angle, it is determined to be a phase sequence error.

[0132] Connect the two three-phase four-wire AC generated by the detection device to the two AC input terminals of the PDU respectively. After power-on, if the phase sequence detection is correct and there is no short-circuit fault, it means that the PDU bus is normal. When the power is officially turned on later, the PDU will not have short-circuit arcing and other phenomena, reducing losses. If a short-circuit fault occurs, the fuse will blow or the inverter protection will stop the output, or the branch switch will be opened; at the same time, since the short-circuit point has limited energy from the power supply end, a short circuit will not burn the equipment, thereby playing a role in troubleshooting and rapid diagnosis.

[0133] Those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. A pre-commissioning detection device for a power distribution unit before power-on, characterized in that: include: An input terminal, a rectifying unit, an inverting unit, a phase sequence detecting unit and at least two output terminals; The input end is electrically connected to the input end of the rectifier unit, and each output end is electrically connected to the output end of the inverter unit; The rectifier unit is used to convert the single-phase alternating current input through the input end into direct current; The inverter unit is used to convert the direct current into three-phase four-wire alternating current, and provide the three-phase four-wire alternating current to the power distribution unit to be detected through the at least one output terminal, and stop outputting the three-phase four-wire alternating current when an abnormality occurs in the circuit of the power distribution unit to be detected; The first input end of the phase sequence detection unit is electrically connected to the first end of the bus tie switch connected to the main bus in the power distribution unit to be detected, and the second end of the phase sequence detection unit is electrically connected to the second end of the bus tie switch. The phase sequence detection unit is used to detect whether the phase sequence of the main bus is correct during the process in which the inverter unit provides the three-phase four-wire alternating current to the power distribution unit to be detected.

2. The detection device according to claim 1, characterized in that Also included is an input switch unit; One end of the input switch unit is electrically connected to the input end, and the other end of the input switch unit is electrically connected to the input end of the rectifier unit.

3. The detection device according to claim 1, characterized in that: Also included is an isolation transformer; The primary side of the isolation transformer is electrically connected to the output end of the inverter unit, and the secondary side of the isolation transformer is electrically connected to each output end.

4. The detection device according to claim 3, characterized in that: Also included is a branch switch corresponding to each output terminal; For any group of branch switches and output ends, one end of the branch switch is electrically connected to the secondary side of the isolation transformer, and the other end of the branch switch is electrically connected to the output end.

5. The detection device according to claim 4, characterized in that: It also includes insurance corresponding to the branch circuit breaker; One end of the fuse is electrically connected to the other end of the branch switch, and the other end of the fuse is electrically connected to the output end.

6. The detection device according to claim 1, characterized in that: The phase sequence detection unit includes a phase detector; The first input terminal of the phase check instrument is electrically connected to the first phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the first phase of the second terminal of the bus tie switch; or The first input terminal of the phase check instrument is electrically connected to the second phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the second phase of the second terminal of the bus tie switch; or The first input terminal of the phase check instrument is electrically connected to the third phase of the first terminal of the bus tie switch, and the second terminal of the phase check instrument is electrically connected to the third phase of the second terminal of the bus tie switch.

7. The detection device according to claim 1, characterized in that: The rectifying unit comprises a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is electrically connected to the cathode of the second diode and serves as a first input terminal of the rectifying unit, and the cathode of the first diode is electrically connected to the cathode of the third diode and serves as a first output terminal of the rectifying unit; The anode of the second diode is electrically connected to the anode of the fourth diode and serves as the second output terminal of the rectifying unit; The anode of the third diode is electrically connected to the cathode of the fourth diode and serves as the second input terminal of the rectifying unit.

8. The detection device according to claim 2, characterized in that: The inverter unit includes an inverter controller, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube; The first end of the first switch tube is electrically connected to the first end of the third switch tube and the first end of the fifth switch tube, and serves as the first input end of the inverter unit, and the second end of the first switch tube is electrically connected to the first end of the second switch tube; The second end of the second switch tube is electrically connected to the second end of the seventh switch tube and the first end of the eighth switch tube, and serves as the first output end of the inverter unit; The second end of the third switch tube is electrically connected to the first end of the fourth switch tube; The second end of the fourth switch tube is electrically connected to the second end of the ninth switch tube and the first end of the tenth switch tube, and serves as the second output end of the inverter unit; The second end of the fifth switch tube is electrically connected to the first end of the sixth switch tube; The second end of the sixth switch tube is electrically connected to the second end of the eleventh switch tube and the first end of the twelfth switch tube, and serves as the third output end of the inverter unit; The first end of the seventh switch tube is electrically connected to the first end of the ninth switch tube and the first end of the eleventh switch tube, and serves as the second input end of the inverter unit; The second end of the eighth switch tube is electrically connected to the second end of the tenth switch tube and the second end of the twelfth switch tube, and serves as the third input end of the inverter unit.

9. The detection device according to claim 8, characterized in that: Also includes a buffer unit; The buffer unit is connected between the first output end of the rectifying unit and the second input end of the inverter unit, and is used to divide the input voltage when the input voltage is unstable.

10. The detection device according to claim 9, characterized in that: The buffer unit includes a charging resistor and a switch; The first end of the charging resistor is electrically connected to the first end of the switch, serving as the first end of the buffer unit, and the second end of the charging resistor is electrically connected to the second end of the switch, serving as the second end of the buffer unit.

11. The detection device according to claim 10, characterized in that: Also includes a filtering unit; The filtering unit is connected between the inverter unit, the rectifying unit and the buffer unit, and is used for filtering the direct current output by the rectifying unit.

12. The detection device according to claim 11, characterized in that: The filtering unit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first inductor, a second inductor, a thirteenth switch tube, a fourteenth switch tube, a fifth diode, a sixth diode, a seventh diode and an eighth diode; The first end of the first capacitor is electrically connected to the first end of the first inductor, the anode of the fifth diode and the second end of the charging resistor, and the second end of the first capacitor is electrically connected to the second end of the thirteenth switch tube, the first end of the fourteenth switch tube, the second end of the second capacitor, the first end of the third capacitor, the second end of the first resistor, the first end of the second resistor and the first input end of the inverter unit; The second end of the first inductor is electrically connected to the first end of the thirteenth switch tube and the anode of the sixth diode; The cathode of the fifth diode is electrically connected to the cathode of the sixth diode, the first end of the second capacitor, the first end of the first resistor and the second input end of the inverter unit; The first end of the second inductor is electrically connected to the cathode of the eighth diode and the second output end of the rectifier unit, and the second end of the second inductor is electrically connected to the second end of the fourteenth switch tube and the cathode of the seventh diode; An anode of the seventh diode is electrically connected to an anode of the eighth diode, a second end of the third capacitor, a second end of the second resistor, and a third input end of the inverter unit.

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