Monitoring system of power distribution unit

Abstract

The utility model provides a monitoring system of a power distribution unit, which relates to the technical field of power distribution unit monitoring, and comprises a power distribution unit and a monitoring module, the monitoring module is connected with the power distribution unit, the power distribution unit is used for distributing power for a load, and the monitoring module is connected with the power distribution unit. And the monitoring module is used for locally and remotely monitoring the electric power parameters of the power distribution unit, and an electric power parameter measuring circuit is arranged in the monitoring module and is used for measuring the electric power parameters to obtain an electric power parameter measuring result. By supporting real-time monitoring of electric power parameter information, the power supply safety of equipment is effectively improved, and the operation and maintenance efficiency of the equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution unit monitoring, in particular to a monitoring system for a power distribution unit. Background Art

[0002] In the electric power communication industry, the power distribution unit is a core device. For example, the DC 48V power distribution unit installed on the top of the cabinet is mainly responsible for providing stable power to the equipment in the cabinet. The stable operation of the power distribution unit is directly related to the stability and security of the entire system. It is the key to ensure smooth communication. Therefore, it is of great significance to monitor the power distribution unit.

[0003] At present, the power distribution unit in the power communication system still mainly relies on manual operation for power supply management, that is, the staff needs to manually open and close the air switch to manage the power supply of the equipment. However, this traditional management method has obvious limitations. On the one hand, it lacks real-time monitoring of key information such as voltage, current, and air switch status of the two power supply lines and multiple branch outputs of the power distribution unit. The lack of these key information makes it impossible for operation and maintenance personnel to accurately grasp the operating status of the power distribution unit, and it is even more impossible to timely discover and deal with potential problems, resulting in the safety of equipment power supply cannot be fully guaranteed; on the other hand, the traditional power distribution unit lacks remote monitoring. When a fault or abnormal situation occurs, the operation and maintenance personnel cannot be informed immediately and must rely on regular on-site inspections to discover problems. This not only increases the workload of the operation and maintenance personnel, but also leads to low operation and maintenance efficiency.

[0004] The purpose of the utility model is to solve the problem that the current power distribution unit lacks intuitive local monitoring and remote monitoring functions, cannot ensure the power supply safety of the equipment, and the operation and maintenance personnel need to conduct regular inspections. Utility Model Content

[0005] In order to solve the problem that the above-mentioned existing technology cannot support real-time monitoring of the power distribution unit, affecting the power supply safety of the equipment and causing low equipment operation and maintenance efficiency, the utility model proposes a monitoring system involving a power distribution unit, which effectively improves the power supply safety of the equipment and ensures the equipment operation and maintenance efficiency by supporting real-time monitoring of power parameter information.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0007] A monitoring system for a power distribution unit comprises a power distribution unit and a monitoring module, wherein the monitoring module is connected to the power distribution unit, and is characterized in that the power distribution unit is used to distribute power to a load, and the monitoring module is used to locally and remotely monitor power parameters of the power distribution unit, and a power parameter measurement circuit is provided in the monitoring module, and the power parameter measurement circuit is used to measure the power parameters to obtain power parameter measurement results.

[0008] Here, firstly, the monitoring module is provided with an electric parameter measurement circuit. The monitoring module uses the electric parameter measurement circuit to measure the electric parameter of the power distribution unit to obtain the electric parameter measurement result, which is convenient for the monitoring module to perform local and remote monitoring of the electric parameter of the power distribution unit. By supporting real-time monitoring of electric parameter information, the power supply management of the equipment is safer and more convenient, and can be realized with few or no people on duty, which greatly reduces the labor cost brought by regular inspections of operation and maintenance personnel and ensures the efficiency of equipment operation and maintenance.

[0009] Preferably, the power distribution unit includes several power distribution circuits connected to the monitoring module, each power distribution circuit includes a first-level distribution circuit and a second-level distribution circuit, the first-level distribution circuit includes an incoming terminal and a main switch, the monitoring module is connected to one end of the incoming terminal, the other end of the incoming terminal is connected to one end of the main switch, and the other end of the main switch is connected to the second-level distribution circuit; the monitoring module is used to monitor the total voltage of the incoming terminal of the first-level distribution circuit and the circuit breaker status of the main switch.

[0010] Preferably, the second-level distribution circuit includes several parallel current branches, each current branch is provided with a shunt, a branch switch and a load terminal, the other end of the main switch is connected to one end of the shunt, the other end of the shunt is connected to one end of the branch switch, the other end of the branch switch is connected to the load terminal, and the monitoring module is also connected to the shunt and the branch switch respectively; the monitoring module is used to monitor the current of the shunt of the second-level distribution circuit and the open state of the branch switch.

[0011] Preferably, a single chip microcomputer for controlling the power parameter measurement circuit is further provided in the monitoring module, and the single chip microcomputer is connected to the power parameter measurement circuit, so that the single chip microcomputer can output a control signal to the power parameter measurement circuit.

[0012] Preferably, the power parameter measurement circuit includes a voltage measurement circuit, a current measurement circuit and a switch input detection circuit, and the voltage measurement circuit, the current measurement circuit and the switch input detection circuit are respectively bidirectionally connected to the single-chip microcomputer; the power parameters of the power distribution unit are measured through the voltage measurement circuit, the current measurement circuit and the switch input detection circuit.

[0013] Preferably, the power parameter measurement circuit also includes a voltage measurement channel switching circuit and a current measurement channel switching circuit, the output end of the single-chip microcomputer is respectively connected to the input end of the voltage measurement channel switching circuit and the current measurement channel switching circuit, the output end of the voltage measurement channel switching circuit is connected to the voltage measurement circuit, and the output end of the current measurement channel switching circuit is connected to the current measurement circuit; the switching of the voltage measurement circuit is realized by the voltage measurement channel switching circuit, and the switching of the current measurement circuit is realized by the current measurement channel switching circuit.

[0014] Preferably, a buzzer driving circuit is further provided in the monitoring module, and the buzzer driving circuit is connected to the single-chip computer; the buzzer driving circuit is used to give an alarm for overvoltage, undervoltage, power failure, etc. of the voltage measured by the voltage measurement circuit.

[0015] Preferably, the monitoring module also includes an indicator light driving circuit, which is connected to the single-chip computer; the indicator light driving circuit prompts overvoltage, undervoltage, power outage, etc. of the voltage measured by the voltage measurement circuit.

[0016] Preferably, the monitoring module further includes a serial communication circuit, the single-chip microcomputer is bidirectionally connected to the serial communication circuit, and the serial communication circuit is connected to a remote monitoring system via a protocol converter to facilitate remote monitoring.

[0017] Preferably, the monitoring module further includes a display unit, and the display unit is bidirectionally connected to the single-chip microcomputer to facilitate real-time display of the power parameters monitored by the monitoring module.

[0018] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0019] The utility model proposes a monitoring system for a power distribution unit, comprising a power distribution unit and a monitoring module, wherein the monitoring module is connected to the power distribution unit. First, the monitoring module is provided with a power parameter measurement circuit, and the monitoring module uses the power parameter measurement circuit to measure the power parameters of the power distribution unit to obtain the power parameter measurement results, so that the monitoring module can perform local and remote monitoring of the power parameters of the power distribution unit. By supporting real-time monitoring of power parameter information, equipment power supply management is safer and more convenient, and can be implemented with less or no personnel on duty, which greatly reduces the labor cost caused by regular inspections by operation and maintenance personnel and ensures equipment operation and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural diagram showing a monitoring system of a power distribution unit proposed in an embodiment of the utility model;

[0021] Figure 2 A power distribution circuit diagram showing a power distribution unit proposed in an embodiment of the utility model;

[0022] Figure 3 Another power distribution circuit diagram of the power distribution unit proposed in the embodiment of the utility model is shown;

[0023] Figure 4 A diagram showing the working principle of the monitoring module proposed in the embodiment of the utility model;

[0024] Figure 5 A structural diagram showing a monitoring module proposed in an embodiment of the present utility model;

[0025] Figure 6 A circuit diagram showing a single chip microcomputer according to an embodiment of the present utility model;

[0026] Figure 7 A diagram showing a first circuit channel in a voltage measurement channel switching circuit proposed in an embodiment of the utility model;

[0027] Figure 8 A second circuit channel diagram of the voltage measurement channel switching circuit proposed in the embodiment of the utility model is shown;

[0028] Fig. 9 A voltage measurement circuit diagram is shown in the embodiment of the present utility model;

[0029] Fig.10 A diagram showing a first current switching channel in a current measurement channel switching circuit proposed in an embodiment of the present utility model;

[0030] Fig.11 A diagram showing a second current switching channel in the current measurement channel switching circuit proposed in an embodiment of the utility model;

[0031] Fig.12 A diagram showing a third current switching channel in the current measurement channel switching circuit proposed in an embodiment of the utility model;

[0032] Fig.13 A diagram showing a fourth current switching channel in the current measurement channel switching circuit proposed in an embodiment of the utility model;

[0033] Fig.14 A diagram showing the fifth current switching channel in the current measurement channel switching circuit proposed in the embodiment of the utility model;

[0034] Fig.15 A sixth current switching channel diagram in the current measurement channel switching circuit proposed in the embodiment of the utility model is shown;

[0035] Fig.16A diagram showing the seventh current switching channel in the current measurement channel switching circuit proposed in the embodiment of the utility model;

[0036] Fig.17 A diagram showing an eighth current switching channel in the current measurement channel switching circuit proposed in an embodiment of the present utility model;

[0037] Fig.18 A current measurement circuit diagram is shown in the embodiment of the present utility model;

[0038] Fig.19 The switch input detection circuit diagram proposed in the embodiment of the utility model is shown;

[0039] Fig. 20 Another switch input detection circuit diagram proposed in the embodiment of the utility model is shown;

[0040] Fig.21 A buzzer driving circuit diagram proposed in an embodiment of the utility model is shown;

[0041] Fig. 22 A circuit diagram showing an indicator light driving circuit proposed in an embodiment of the utility model;

[0042] Fig.23 A diagram showing the remote working principle of the monitoring module proposed in the embodiment of the utility model;

[0043] Fig.24 It shows a serial communication circuit diagram proposed in an embodiment of the utility model.

[0044] 1. Power distribution unit; 2. Monitoring module; 21. Power parameter measurement circuit; 211. Voltage measurement circuit; 212. Current measurement circuit; 213. Switch input detection circuit; 214. Voltage measurement channel switching circuit; 215. Current measurement channel switching circuit; 22. Single chip microcomputer; 23. Buzzer drive circuit; 24. Indicator light drive circuit; 25. Serial communication circuit; 26. Display unit. DETAILED DESCRIPTION

[0045] The accompanying drawings are only used for illustrative purposes and are not to be construed as limiting the present application;

[0046] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual sizes. The description of the directions of parts such as "upper" and "lower" is not a limitation of the present application.

[0047] It is understandable to those skilled in the art that some well-known contents may be omitted in the drawings;

[0048] The terms used to describe the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limiting the present application;

[0049] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0050] Example 1

[0051] See also Figure 1 This embodiment proposes a monitoring system for a power distribution unit, including a power distribution unit 1 and a monitoring module 2. The monitoring module 2 is connected to the power distribution unit 1. The power distribution unit 1 is used to distribute power to the load. The monitoring module 2 is used to locally and remotely monitor the power parameters of the power distribution unit. The monitoring module 2 is provided with a power parameter measurement circuit 21. The power parameter measurement circuit 21 is used to measure the power parameters and obtain power parameter measurement results. The power distribution unit 1 is a DC 48V power distribution unit. The power parameters include information such as voltage, current, power, circuit breaker status, alarms, and system parameters.

[0052] The power distribution unit 1 includes two power distribution circuits connected to the monitoring module 2. Figure 2The first power distribution circuit includes a first-level distribution circuit and a second-level distribution circuit, the first-level distribution circuit includes a -48V incoming terminal, a 0V incoming terminal and a main switch QFA, the monitoring module 2 is connected to one end of the -48V incoming terminal of the first-level distribution circuit, the other end of the -48V incoming terminal of the first-level distribution circuit is connected to one end of the main switch QFA, the other end of the main switch QFA is connected to the second-level distribution circuit in the first power distribution circuit, the second-level distribution circuit in the first power distribution circuit includes 4 parallel current branches, The first current branch is provided with a shunt RA1, a branch switch QFA1 and a load terminal R1, the other end of the main switch QFA is connected to one end of the shunt RA1, the other end of the shunt RA1 is connected to one end of the branch switch QFA1, the other end of the branch switch QFA1 is connected to the load terminal R1, and the monitoring module 2 is also connected to the shunt RA1 and the branch switch QFA1 respectively; the second current branch is provided with a shunt RA2, a branch switch QFA2 and a load terminal R2, the other end of the main switch QFA is connected One end of the shunt RA2, the other end of the shunt RA2 is connected to one end of the branch switch QFA2, the other end of the branch switch QFA2 is connected to the load terminal R2, and the monitoring module 2 is also connected to the shunt RA2 and the branch switch QFA2 respectively; the third current branch is provided with a shunt RA3, a branch switch QFA3 and a load terminal R3, the other end of the main switch QFA is connected to one end of the shunt RA3, the other end of the shunt RA3 is connected to one end of the branch switch QFA3, and the branch switch QF The other end of A3 is connected to the load terminal R3, and the monitoring module 2 is also connected to the shunt RA3 and the branch switch QFA3 respectively; the fourth current branch is provided with a shunt RA4, a branch switch QFA4 and a load terminal R4, the other end of the main switch QFA is connected to one end of the shunt RA4, the other end of the shunt RA4 is connected to one end of the branch switch QFA4, the other end of the branch switch QFA4 is connected to the load terminal R4, and the monitoring module 2 is also connected to the shunt RA4 and the branch switch QFA4 respectively.

[0053] See also Figure 3The second power distribution circuit includes a first-level distribution circuit and a second-level distribution circuit, the first-level distribution circuit in the second power distribution circuit includes a -48V incoming terminal, a 0V incoming terminal and a main switch QFB, the monitoring module 2 is connected to one end of the -48V incoming terminal of the first-level distribution circuit in the second power distribution circuit, the other end of the -48V incoming terminal of the first-level distribution circuit is connected to one end of the main switch QFB, the other end of the main switch QFB is connected to the second-level distribution circuit in the second power distribution circuit, the second-level distribution circuit in the second power distribution circuit The loop includes 4 parallel current branches, wherein the fifth current branch is provided with a shunt RB1, a branch switch QFB1 and a load terminal R5, the other end of the main switch QFB is connected to one end of the shunt RB1, the other end of the shunt RB1 is connected to one end of the branch switch QFB1, the other end of the branch switch QFB1 is connected to the load terminal R5, and the monitoring module 2 is also connected to the shunt RB1 and the branch switch QFB1 respectively; the sixth current branch is provided with a shunt RB2, a branch switch QFB2 and a load terminal R6, the main switch The other end of QFB is connected to one end of the shunt RB2, the other end of the shunt RB2 is connected to one end of the branch switch QFB2, the other end of the branch switch QFB2 is connected to the load terminal R6, and the monitoring module 2 is also connected to the shunt RB2 and the branch switch QFB2 respectively; the seventh current branch is provided with a shunt RB3, a branch switch QFB3 and a load terminal R7, the other end of the main switch QFB is connected to one end of the shunt RB3, the other end of the shunt RB3 is connected to one end of the branch switch QFB3, and the branch The other end of the main switch QFB3 is connected to the load terminal R7, and the monitoring module 2 is also connected to the shunt RB3 and the branch switch QFB3 respectively; the eighth current branch is provided with a shunt RB4, a branch switch QFB4 and a load terminal R8, the other end of the main switch QFB is connected to one end of the shunt RB4, the other end of the shunt RB4 is connected to one end of the branch switch QFB4, the other end of the branch switch QFB4 is connected to the load terminal R8, and the monitoring module 2 is also connected to the shunt RB4 and the branch switch QFB4 respectively. Figure 4The monitoring module measures the total voltage A and total voltage B of the two DC -48V incoming terminals and the current of the eight current branches to monitor the voltage, current, power and other parameters of the two incoming lines and eight branches and to issue alarms for overvoltage, undervoltage, power outages and other situations; the monitoring module collects the status of each switch to monitor and issue alarms for the status of the two main switches QFA-QFB and the eight branch switches. It should be specially stated that the monitoring module is connected to the -48V incoming terminals of the two power distribution circuits, and the total voltage A and the total voltage B are respectively taken from the -48V incoming terminals of the two power distribution circuits to power the monitoring module. The monitoring module measures the total voltage A and the total voltage B to realize voltage monitoring of the two incoming lines; the monitoring module is connected to the sampling points of the eight shunts RA1-RB4 to realize the measurement of the current of the eight current branches; the monitoring module is connected to the auxiliary contacts of the two main switches QFA, QFB and the eight branch switches QFA1, QFA2, QFA3, QFA4, QFB1, QFB2, QFB3, QFB4 to realize the measurement of the states of the two main switches and the eight branch switches;

[0054] See also Figure 5 , the monitoring module 2 is also provided with a single-chip microcomputer 22 for controlling the power parameter measurement circuit 21, and the single-chip microcomputer 22 is connected to the power parameter measurement circuit 21. The monitoring module 2 also has a display unit 26, and the display unit 26 is bidirectionally connected to the single-chip microcomputer 22 through a UART interface; the single-chip microcomputer 22 sends the voltage, current, circuit breaker status, alarm information, system parameters, etc. to the display screen through the serial port for display. The user can modify the system parameters through the display screen, and the display screen sends the modified parameters to the single-chip microcomputer through the UART interface. The display screen of the monitoring module can display the various working status parameters of the power distribution unit in real time, and the various setting parameters of the monitoring module can be changed by touch input; the display screen adopts a serial port screen, which is used to display the incoming line voltage, current, branch current, circuit breaker status, alarm and system parameters of the intelligent DC 48V power distribution unit, and the user can modify the system parameters by touching the display screen.

[0055] In this embodiment, the monitoring module is applied to the intelligent DC 48V power distribution unit. The monitoring module integrates functions such as measurement, status acquisition, data processing, display, and data upload, which reduces costs, simplifies installation, and makes the management of the DC 48V power distribution unit more efficient and intelligent, reducing manpower investment; the monitoring module can monitor the two incoming lines of the DC 48V power distribution unit in the computer room and the status, voltage, current, power and other parameters of each branch in real time. Various parameters and power distribution conditions can be directly displayed on the monitoring module, allowing users to intuitively understand the power consumption of each line, and at the same time it can also promote the intelligent management of equipment power consumption. It should also be specially stated that the present embodiment proposes a monitoring system for a power distribution unit. First, the monitoring module is provided with a power parameter measurement circuit. The monitoring module uses the power parameter measurement circuit to measure the power parameters of the power distribution unit to obtain the power parameter measurement results, which is convenient for the monitoring module to perform local and remote monitoring of the power parameters of the power distribution unit. By supporting real-time monitoring of power parameter information, the power supply management of the equipment is safer and more convenient, and can be implemented with few or no people on duty, which greatly reduces the labor cost caused by regular inspections by operation and maintenance personnel and ensures the efficiency of equipment operation and maintenance.

[0056] Example 2

[0057] See also Figure 5 The power parameter measurement circuit 21 includes a voltage measurement circuit 211, a current measurement circuit 212 and a switch input detection circuit 213. The voltage measurement circuit 211, the current measurement circuit 212 and the switch input detection circuit 213 are respectively bidirectionally connected to the single chip computer 22.

[0058] The power parameter measurement circuit 21 also includes a voltage measurement channel switching circuit 214 and a current measurement channel switching circuit 215. The output end of the single-chip computer 22 is respectively connected to the input ends of the voltage measurement channel switching circuit 214 and the current measurement channel switching circuit 215. The output end of the voltage measurement channel switching circuit 214 is connected to the voltage measurement circuit 211, and the output end of the current measurement channel switching circuit 215 is connected to the current measurement circuit 212.

[0059] The voltage measurement channel switching circuit 214 includes two circuit channels corresponding to the power distribution circuit. Figure 6 and Figure 7, the first circuit channel corresponds to the first power distribution loop, the first circuit channel includes resistor R75, resistor R80, transistor Q10, resistor R70, resistor R76, first chip OC9, resistor R71, resistor R72, resistor R73, resistor R77 and resistor R78, the model of the first chip OC9 is OC-KAQW216, one end of the resistor R80 is connected to the interface V_CH1 of the single-chip microcomputer, the other end of the resistor R80 is respectively connected to one end of the resistor R75 and the base of the transistor Q10, the other end of the resistor R75 is respectively connected to the external power supply and the emitter of the transistor Q10, the collector of the transistor Q10 is respectively connected to one end of the resistor R70 and one end of the resistor R76, one end of the resistor R70 is connected to the first pin of the first chip OC9, the second pin of the first chip OC9 is grounded, and one end of the resistor R76 is connected to the first The third pin of chip OC9 and the fourth pin of the first chip OC9 are grounded, the fifth pin V_COM- and the seventh pin V_COM+ of the first chip OC9 are respectively connected to the input end of the voltage measurement circuit, the eighth pin of the first chip OC9 is respectively connected to one end of the resistor R73 and one end of the resistor R71, the other end of the resistor R71 is connected to one end of the resistor R72, the other end of the resistor R72 is connected to the input end 0V_1 of the first circuit channel, the input end 0V_1 is connected to the 0V incoming terminal of the total voltage A, the sixth pin of the first chip OC9 is respectively connected to the other end of the resistor R73 and one end of the resistor R77, the other end of the resistor R77 is connected to one end of the resistor R78, the other end of the resistor R78 is connected to the input end -48V_1 of the first circuit channel, and the input end -48V_1 is connected to the -48V incoming terminal of the total voltage A;

[0060] See also Figure 6 and Figure 8The second circuit channel includes a resistor R88, a resistor R92, a transistor Q11, a resistor R83, a resistor R89, a second chip OC10, a resistor R84, a resistor R85, a resistor R87, a resistor R90 and a resistor R91. The model of the second chip OC10 is OC-KAQW216. One end of the resistor R92 is connected to the interface V_CH2 of the single-chip computer. The other end of the resistor R92 is respectively connected to one end of the resistor R88 and the base of the transistor Q11. The other end of the resistor R88 is respectively connected to the external power supply and the emitter of the transistor Q11. The collector of the transistor Q11 is respectively connected to one end of the resistor R83 and one end of the resistor R89. One end of the resistor R83 is connected to the first pin of the second chip OC10. The second pin of the second chip OC10 is grounded. One end of the resistor R89 ​​is connected to the third pin of the second chip OC10. The fourth pin of the second chip OC10 is grounded, the fifth pin V_COM- and the seventh pin V_COM+ of the second chip OC10 are respectively connected to the input end of the voltage measurement channel switching circuit, the eighth pin of the second chip OC10 is respectively connected to one end of the resistor R87 and one end of the resistor R84, the other end of the resistor R84 is connected to one end of the resistor R85, the other end of the resistor R85 is connected to the input end 0V_2 of the second circuit channel, the input end 0V_2 is connected to the 0V incoming terminal of the total voltage B, the sixth pin of the second chip OC10 is respectively connected to the other end of the resistor R87 and one end of the resistor R90, the other end of the resistor R90 is connected to one end of the resistor R91, the other end of the resistor R91 is connected to the input end -48V_2 of the second circuit channel, the input end -48V_2 is connected to the -48V incoming terminal of the total voltage B;

[0061] See also Figure 6 and Fig. 9The voltage measurement circuit 211 includes a resistor R79, a resistor R81, a capacitor C52, a resistor R74, a resistor R86, a capacitor C53, an amplifier U11, a capacitor C47, a capacitor C51, a resistor R82, a third chip U12, a fourth chip U13, a resistor R66, a resistor R67, a capacitor C48, a capacitor C49, a capacitor C50, a resistor R68 and a resistor R69. The model of the third chip U12 is ADS1110A0IDBVR, and the model of the fourth chip U13 is NSI8100N. One end of the resistor R79 is connected to the pin V_COM+ of the voltage measurement channel switching circuit 214, and one end of the resistor R81 is connected to the pin V_COM+ of the voltage measurement channel switching circuit 214. 4 is connected to pin V_COM-, the other end of resistor R79 is connected to one end of capacitor C52, one end of resistor R74 and the third pin of amplifier U11 respectively, the other end of capacitor C52 and the other end of resistor R74 are grounded together, the other end of resistor R81 is connected to the fourth pin of amplifier U11, one end of resistor R86 and one end of capacitor C53 respectively, the fifth pin of amplifier U11 is connected to the external power supply, one end of capacitor C47 and one end of capacitor C51 respectively, the other end of capacitor C47 and the other end of capacitor C51 are grounded together; the second pin of amplifier U11 is grounded, the first pin of amplifier U11 is connected to the other end of resistor R86, the other end of capacitor C53 and the One end of the resistor R82 is connected to the pin Vin+ of the third chip U12, the other end of the resistor R82 is connected to the pin GND of the third chip U12 is grounded, the pin SCL of the third chip U12 is respectively connected to the pin SCL1 of the fourth chip U13 and one end of the resistor R66, the pin Vin- of the third chip U12 is grounded, the pin VDD of the third chip U12 and the pin VCC1 of the fourth chip U13 are commonly connected to the external power supply, the pin SDA of the third chip U12 is respectively connected to the pin SDA1 of the fourth chip U13 and one end of the resistor R67, one end of the capacitor C48 and the capacitor C49 are commonly grounded, and the other ends of the capacitors C48, C49, the resistor R66 and the resistor R67 are commonly grounded. The fourth chip U13 is connected to the external power supply; the pin GND1 of the fourth chip U13 is grounded, the pin VCC2 of the fourth chip U13 is connected to the external power supply, the pin SDA2 of the fourth chip U13 is respectively connected to the pin I2C1_SDA of the single-chip computer and one end of the resistor R68, the pin SCL2 of the fourth chip U13 is respectively connected to the pin I2C1_SCL of the single-chip computer and one end of the resistor R69, one end of the capacitor C50 is grounded, and the other ends of the capacitor C50, the resistor R68 and the resistor R69 are commonly connected to the external power supply; the two solid-state relays are turned on in turn by alternating the high and low levels output by V_CH1 and V_CH2, so that the total voltage A and the total voltage B are measured in turn by the voltage measurement circuit.

[0062] The current measurement channel switching circuit 215 includes 8 current switching channels, namely:

[0063] See also Fig.10 The first current switching channel includes a resistor R30, a resistor R33, a transistor Q2, a resistor R25, a resistor R31 and a first switching chip OC1. One end of the resistor R33 is connected to the pin I_CH1 of the single-chip computer, and the other end of the resistor R33 is respectively connected to one end of the resistor R30 and the base of the transistor Q2. The other end of the resistor R30 is respectively connected to the external power supply and the emitter of the transistor Q2. The collector of the transistor Q2 is respectively connected to one end of the resistor R25 and one end of the resistor R31. The other end of the resistor R25 is connected to the first switching chip O The first pin of C1 and the second pin of the first switching chip OC1 are grounded, the other end of the resistor R31 is connected to the third pin of the first switching chip OC1, the fourth pin of the first switching chip OC1 is grounded, the input pins I_CH1_N and I_CH1_P of the first switching chip OC1 are respectively connected to the positive and negative sampling points of the shunt RA1 in the first current branch, and the output pins I_COM+ and I_COM- of the first switching chip OC1 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0064] See also Fig.11 The second current switching channel includes a resistor R38, a resistor R41, a transistor Q3, a resistor R37, a resistor R40 and a second switching chip OC2. One end of the resistor R41 is connected to the pin I_CH2 of the single-chip computer, and the other end of the resistor R41 is respectively connected to one end of the resistor R38 and the base of the transistor Q3. The other end of the resistor R38 is respectively connected to the external power supply and the emitter of the transistor Q3. The collector of the transistor Q3 is respectively connected to one end of the resistor R37 and one end of the resistor R40. The other end of the resistor R37 is connected to the second switching chip O The first pin of C2 and the second pin of the second switching chip OC2 are grounded, the other end of the resistor R40 is connected to the third pin of the second switching chip OC2, the fourth pin of the second switching chip OC2 is grounded, the input pins I_CH2_N and I_CH2_P of the second switching chip OC2 are respectively connected to the positive and negative sampling points of the shunt RA2 in the second current branch, and the output pins I_COM+ and I_COM- of the second switching chip OC2 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0065] See also Fig.12The third current switching channel includes a resistor R43, a resistor R45, a transistor Q4, a resistor R42, a resistor R44 and a third switching chip OC3. One end of the resistor R45 is connected to the pin I_CH3 of the single-chip computer, the other end of the resistor R45 is respectively connected to one end of the resistor R43 and the base of the transistor Q4, the other end of the resistor R43 is respectively connected to the external power supply and the emitter of the transistor Q4, the collector of the transistor Q4 is respectively connected to one end of the resistor R42 and one end of the resistor R44, the other end of the resistor R42 is connected to the first pin of the third switching chip OC3, the second pin of the third switching chip OC3 is grounded, the other end of the resistor R44 is connected to the third pin of the third switching chip OC3, the fourth pin of the third switching chip OC3 is grounded, and the input pins I CH3 N and I CH3 of the third switching chip OC3 are connected. P is respectively connected to the positive and negative sampling points of the shunt RA3 in the third current branch, and the output pins I_COM+ and I_COM- of the third switching chip OC3 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0066] See also Fig.13 The fourth current switching channel includes a resistor R47, a resistor R49, a transistor Q5, a resistor R46, a resistor R48 and a fourth switching chip OC4, one end of the resistor R49 is connected to the pin I_CH4 of the single-chip computer, the other end of the resistor R49 is respectively connected to one end of the resistor R47 and the base of the transistor Q5, the other end of the resistor R47 is respectively connected to the external power supply and the emitter of the transistor Q5, the collector of the transistor Q5 is respectively connected to one end of the resistor R46 and one end of the resistor R48, the other end of the resistor R46 is connected to the fourth switching chip O The first pin of C4 and the second pin of the fourth switching chip OC4 are grounded, the other end of the resistor R48 is connected to the third pin of the fourth switching chip OC4, the fourth pin of the fourth switching chip OC4 is grounded, the input pins I_CH4_N and I_CH4_P of the fourth switching chip OC4 are respectively connected to the positive and negative sampling points of the shunt RA4 in the fourth current branch, and the output pins I_COM+ and I_COM- of the fourth switching chip OC4 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0067] See also Fig.14The fifth current switching channel includes a resistor R51, a resistor R53, a transistor Q6, a resistor R50, a resistor R52 and a fifth switching chip OC5. One end of the resistor R53 is connected to the pin I_CH5 of the single-chip computer, and the other end of the resistor R53 is respectively connected to one end of the resistor R51 and the base of the transistor Q6. The other end of the resistor R51 is respectively connected to the external power supply and the emitter of the transistor Q6. The collector of the transistor Q6 is respectively connected to one end of the resistor R50 and one end of the resistor R52. The other end of the resistor R50 is connected to the fifth switching chip O The first pin of C5 and the second pin of the fifth switching chip OC5 are grounded, the other end of the resistor R52 is connected to the third pin of the fifth switching chip OC5, the fourth pin of the fifth switching chip OC5 is grounded, the input pins I_CH5_N and I_CH5_P of the fifth switching chip OC5 are respectively connected to the positive and negative sampling points of the shunt RA5 in the fifth current branch, and the output pins I_COM+ and I_COM- of the fifth switching chip OC5 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0068] See also Fig.15 The sixth current switching channel includes a resistor R55, a resistor R57, a transistor Q7, a resistor R54, a resistor R56 and a sixth switching chip OC6, one end of the resistor R57 is connected to the pin I_CH6 of the single-chip computer, the other end of the resistor R57 is respectively connected to one end of the resistor R55 and the base of the transistor Q7, the other end of the resistor R55 is respectively connected to the external power supply and the emitter of the transistor Q7, the collector of the transistor Q7 is respectively connected to one end of the resistor R54 and one end of the resistor R56, the other end of the resistor R54 is connected to the first pin of the sixth switching chip OC6, the second pin of the sixth switching chip OC6 is grounded, the other end of the resistor R56 is connected to the third pin of the sixth switching chip OC6, the fourth pin of the sixth switching chip OC6 is grounded, and the input pins I CH6 N and I CH6 of the sixth switching chip OC6 are P is respectively connected to the positive and negative sampling points of the shunt RA6 in the sixth current branch, and the output pins I_COM+ and I_COM- of the sixth switching chip OC6 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0069] See also Fig.16The seventh current switching channel includes a resistor R59, a resistor R61, a transistor Q8, a resistor R58, a resistor R60 and a seventh switching chip OC7. One end of the resistor R61 is connected to the pin I_CH7 of the single-chip computer, and the other end of the resistor R61 is respectively connected to one end of the resistor R59 and the base of the transistor Q8. The other end of the resistor R59 is respectively connected to the external power supply and the emitter of the transistor Q8. The collector of the transistor Q8 is respectively connected to one end of the resistor R58 and one end of the resistor R60. The other end of the resistor R58 is connected to the seventh switching chip O The first pin of C7 and the second pin of the seventh switching chip OC7 are grounded, the other end of the resistor R60 is connected to the third pin of the seventh switching chip OC7, the fourth pin of the seventh switching chip OC7 is grounded, the input pins I_CH7_N and I_CH7_P of the seventh switching chip OC7 are respectively connected to the positive and negative sampling points of the shunt RA7 in the seventh current branch, and the output pins I_COM+ and I_COM- of the seventh switching chip OC7 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0070] See also Fig.17 The eighth current switching channel includes a resistor R63, a resistor R65, a transistor Q9, a resistor R62, a resistor R64 and an eighth switching chip OC8, one end of the resistor R65 is connected to the pin I_CH8 of the single-chip computer, the other end of the resistor R65 is respectively connected to one end of the resistor R93 and the base of the transistor Q9, the other end of the resistor R63 is respectively connected to the external power supply and the emitter of the transistor Q9, the collector of the transistor Q9 is respectively connected to one end of the resistor R62 and one end of the resistor R65, the other end of the resistor R62 is connected to the eighth switching chip O The first pin of C8 and the second pin of the eighth switching chip OC8 are grounded, the other end of the resistor R64 is connected to the third pin of the eighth switching chip OC8, the fourth pin of the eighth switching chip OC8 is grounded, the input pins I_CH8_N and I_CH8_P of the eighth switching chip OC8 are respectively connected to the positive and negative sampling points of the shunt RA8 in the eighth current branch, and the output pins I_COM+ and I_COM- of the eighth switching chip OC8 are respectively connected to the input pins I_COM+ and I_COM- of the current measurement circuit;

[0071] See also Fig.18The current measurement circuit 212 includes a resistor R34, a resistor R35, a resistor R32, a capacitor R33, a capacitor R37, an amplifier U7, a resistor R39, a capacitor C39, a resistor R36, a first current measurement chip U8, a second current measurement chip U9, a resistor R26, a resistor R27, a capacitor C34, a capacitor C35, a capacitor C36, a resistor R28 and a resistor R29. The model of the first current measurement chip U8 is ADS1110A0IDBVR, and the model of the second current measurement chip U9 is NSI8100N. One end of the resistor R34 is connected to the pin I_COM+ of the current measurement channel switching circuit 215, and one end of the resistor R35 is connected to the pin I_COM-, the other end of the resistor R34 is respectively connected to one end of the capacitor C38, one end of the resistor R32 and the third pin of the amplifier U7, the other end of the capacitor C38 and the other end of the resistor R32 are grounded together, the other end of the resistor R35 is respectively connected to the fourth pin of the amplifier 7, one end of the resistor R39 and one end of the capacitor C39, the fifth pin of the amplifier 7 is respectively connected to the external power supply, one end of the capacitor C33 and one end of the capacitor C37, the other end of the capacitor C33 and the other end of the capacitor C37 are grounded together; the second pin of the amplifier 7 is grounded, the first pin of the amplifier U7 is respectively connected to the other end of the resistor R39, the other end of the capacitor C39 and one end of the resistor R36, the other end of the resistor R36 is connected to the The pin Vin+ of the first current measuring chip U8, the pin GND of the first current measuring chip U8 is grounded, the pin SCL of the first current measuring chip U8 is connected to the pin SCL1 of the second current measuring chip U9 and one end of the resistor R26 respectively, the pin Vin- of the first current measuring chip U8 is grounded, the pin VDD of the first current measuring chip U8 and the pin VCC1 of the second current measuring chip U9 are connected to the external power supply, the pin SDA of the first current measuring chip U8 is connected to the pin SDA1 of the second current measuring chip U9 and one end of the resistor R27 respectively, one end of the capacitor C34 and the capacitor C35 are grounded together, and the other ends of the capacitor C34, the capacitor C35, the resistor R26 and the resistor R27 are connected together Connect an external power supply; pin GND1 of the second current measuring chip U9 is grounded, pin VCC2 of the second current measuring chip U9 is connected to the external power supply, pin SDA2 of the second current measuring chip U9 is respectively connected to pin I2C1_SDA of the single-chip computer and one end of resistor R28, pin SCL2 of the second current measuring chip U9 is respectively connected to pin I2C1_SCL of the single-chip computer and one end of resistor R29, one end of capacitor C36 is grounded, and the other ends of capacitor C36, resistor R28 and resistor R29 are commonly connected to the external power supply; eight solid-state relays are turned on in turn by outputting high and low levels in turn from I_CH1 to I_CH8, so that the eight branch currents are measured in turn by the current measurement circuit.

[0072] See also Fig.19 and Fig. 20, the switch input detection circuit 213 includes 10 detection channels, namely: the first detection channel includes a resistor R97, a first detection chip U15, and a resistor R98, one end of the resistor R97 is connected to the first power input terminal V1, the other end of the resistor R97 is connected to the first pin of the first detection chip U15, the second pin QFA1_IN of the first detection chip U15 is connected to the auxiliary contact of the branch switch QFA1, the third pin of the first detection chip U15 is grounded, the fourth pin SA1 of the first detection chip U15 is respectively connected to the pin PE14 of the single-chip computer and one end of the resistor R98, and the other end of the resistor R98 is connected to the external power supply; the second detection channel includes a resistor R101, a second detection chip U17 and a resistor R102 , one end of the resistor R101 is connected to the first power input terminal V1, the other end of the resistor R101 is connected to the first pin of the second detection chip U17, the second pin QFA2_IN of the second detection chip U17 is connected to the auxiliary contact of the branch switch QFA2, the third pin of the second detection chip U17 is grounded, the fourth pin SA2 of the second detection chip U17 is respectively connected to the pin PE13 of the microcontroller and one end of the resistor R102, and the other end of the resistor R102 is connected to the external power supply; the third detection channel includes a resistor R105, a third detection chip U19 and a resistor R106, one end of the resistor R105 is connected to the first power input terminal V1, the other end of the resistor R105 is connected to the first pin of the third detection chip U19, and ... The second pin QFA3_IN of the chip U19 is connected to the auxiliary contact of the branch switch QFA3, the third pin of the third detection chip U19 is grounded, the fourth pin SA3 of the third detection chip U19 is respectively connected to the pin PE12 of the single-chip computer and one end of the resistor R106, and the other end of the resistor R106 is connected to the external power supply; the fourth detection channel includes a resistor R109, a fourth detection chip U21 and a resistor R110, one end of the resistor R109 is connected to the first power input terminal V1, the other end of the resistor R109 is connected to the first pin of the fourth detection chip U21, the second pin QFA4_IN of the fourth detection chip U21 is connected to the auxiliary contact of the branch switch QFA4, the third pin of the fourth detection chip U21 is grounded, and the fourth detection The fourth pin SA4 of the test chip U21 is respectively connected to the pin PE11 of the single-chip computer and one end of the resistor R110, and the other end of the resistor R110 is connected to the external power supply; the fifth detection channel includes a resistor R113, a fifth detection chip U23 and a resistor R114, one end of the resistor R113 is connected to the first power input terminal V1, the other end of the resistor R113 is connected to the first pin of the fifth detection chip U23, the second pin QFA_IN of the fifth detection chip U23 is connected to the auxiliary contact of the main switch QFA, the third pin of the fifth detection chip U23 is grounded, the fourth pin SA of the fifth detection chip U23 is respectively connected to the pin PE15 of the single-chip computer and one end of the resistor R114, and the other end of the resistor R114 is connected to the external power supply;The sixth detection channel includes a resistor R99, a sixth detection chip U16 and a resistor R100, one end of the resistor R99 is connected to the second power input terminal V2, the other end of the resistor R99 is connected to the first pin of the sixth detection chip U16, the second pin QFB1_IN of the sixth detection chip U16 is connected to the auxiliary contact of the branch switch QFB1, the third pin of the sixth detection chip U16 is grounded, the fourth pin SB1 of the sixth detection chip U16 is respectively connected to the pin PE9 of the single-chip computer and one end of the resistor R100, and the other end of the resistor R100 is connected to the external power supply; the seventh detection channel includes a resistor R103, a seventh detection chip U18 and a resistor R104, one end of the resistor R103 is connected to the second power input The eighth detection channel includes a resistor R107, an eighth detection chip U20 and a resistor R108, one end of the resistor R107 is connected to the second power supply input terminal V2, the other end of the resistor R107 is connected to the first pin of the eighth detection chip U18, the second pin QFB2_IN of the seventh detection chip U18 is connected to the auxiliary contact of the branch switch QFB2, the third pin of the seventh detection chip U18 is grounded, the fourth pin SB2 of the seventh detection chip U18 is respectively connected to the pin PE8 of the single-chip computer and one end of the resistor R104, and the other end of the resistor R104 is connected to the external power supply; the eighth detection channel includes a resistor R107, an eighth detection chip U20 and a resistor R108, one end of the resistor R107 is connected to the second power supply input terminal V2, the other end of the resistor R107 is connected to the first pin of the eighth detection chip U20, and the second pin QF B3_IN is connected to the auxiliary contact of the branch switch QFB3, the third pin of the eighth detection chip U20 is grounded, the fourth pin SB3 of the eighth detection chip U20 is respectively connected to the pin PE7 of the single-chip computer and one end of the resistor R108, and the other end of the resistor R108 is connected to the external power supply; the ninth detection channel includes a resistor R111, a ninth detection chip U22 and a resistor R112, one end of the resistor R107 is connected to the second power supply input terminal V2, the other end of the resistor R107 is connected to the first pin of the eighth detection chip U20, the second pin QFB4_IN of the ninth detection chip U22 is connected to the auxiliary contact of the branch switch QFB4, the third pin of the ninth detection chip U22 is grounded, and the ninth detection chip U22 The fourth pin SB4 is respectively connected to the pin PB1 of the single-chip computer and one end of the resistor R112, and the other end of the resistor R112 is connected to the external power supply; the tenth detection channel includes a resistor R115, a tenth detection chip U24 and a resistor R116, one end of the resistor R105 is connected to the second power input terminal V2, the other end of the resistor R105 is connected to the first pin of the tenth detection chip U24, the second pin QFB_IN of the tenth detection chip U24 is connected to the auxiliary contact of the main switch QFB, the third pin of the tenth detection chip U24 is grounded, the fourth pin SB of the tenth detection chip U24 is respectively connected to the pin PE10 of the single-chip computer and one end of the resistor R116, and the other end of the resistor R116 is connected to the external power supply;The output pins SA1, SA2, SA3, SA4, SA, SB1, SB2, SB3, SB4, and SB of the switch input detection circuit are respectively connected to the 10 GPIO pins of the microcontroller; the input pins QFA1_IN, QFA2_IN, QFA3_IN, QFA4_IN, QFA_IN, QFB1_IN, QFB2_IN, QFB3_IN, QFB4_IN, and QFB_IN of the switch input detection circuit are respectively connected to the auxiliary contacts of 10 switches to detect 10 circuit breaker states. ;

[0073] Example 3

[0074] See also Figure 6 and Fig.21 The monitoring module 2 is also provided with a buzzer drive circuit 23, and the buzzer drive circuit 23 is bidirectionally connected to the single-chip computer 22; the buzzer drive circuit 23 includes a BUZZER port, a resistor R19, a resistor R20, a transistor Q1, a resistor R16 and a buzzer, and the pin PC0 of the single-chip computer 22 is connected to the BUZZER port, the BUZZER port is connected to one end of the resistor R19, and the other end of the resistor R19 is respectively connected to the base of the transistor Q1 and one end of the resistor R20, and the other end of the resistor R20 is grounded together with the emitter of the transistor Q1, and the transistor Q The collector of the single-chip microcomputer 22 is connected to the first pin of the buzzer, the second pin of the buzzer is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the external power supply 5V; the buzzer driving circuit 23 is bidirectionally connected to the pin PC0 of the single-chip microcomputer 22 through the BUZZER port, and the BUZZER port outputs a high level to saturate the transistor Q1, thereby driving the buzzer in the buzzer driving circuit 23 to make a sound, and the single-chip microcomputer 22 outputs a low level through the pin PC0 to make the transistor Q1 in a cut-off state, thereby driving the buzzer of the buzzer driving circuit 23 to stop making a sound. The buzzer driving circuit 23 enables the monitoring module to provide a buzzer sound alarm for the alarm information, and records the alarm generation and recovery time in combination with the display unit text alarm.

[0075] See also Figure 6 and Fig. 22 The monitoring module 2 also includes an indicator light driving circuit 24, which is connected to the single-chip computer 22; the indicator light driving circuit 24 includes a resistor R23 and an LED indicator light, one end of the resistor R23 is connected to an external power supply, the other end of the resistor R23 is connected to the positive electrode of the LED indicator light, and the negative electrode of the LED indicator light is connected to the pin PC1 of the single-chip computer 22; the single-chip computer 22 is connected to the indicator light driving circuit 24 via the pin PC1, and the pin PC1 turns on the LED indicator light by outputting a low level, and turns off the LED indicator light by outputting a high level.

[0076] Example 4

[0077] See also Figure 6 and Fig.23 The monitoring module 2 also includes a serial communication circuit 25, the single-chip microcomputer 22 is bidirectionally connected to the serial communication circuit 25, and the serial communication circuit 25 is connected to the remote monitoring system through a protocol converter; wherein the serial communication circuit 25 is a serial port to RS485 circuit, and the protocol converter is an IEC61850 protocol converter, see Figure 6 and Fig.24 , the single-chip computer 22 is connected to one end of the serial port to RS485 circuit through the UART interface USART2_TX, USART2_RX and the GPIO interface RS485_DE, and the other end of the serial port to RS485 circuit is connected to the wiring terminal CN3, and the IEC61850 protocol converter is connected to the monitoring module 2 through the wiring terminal CN3. The serial communication circuit provides a serial port to RS485 circuit interface for the monitoring module, which can be connected to the IEC61850 protocol converter as a slave device, and the IEC61850 protocol converter is then connected to the remote monitoring system to realize remote monitoring. Various parameters and power distribution conditions can be directly displayed in the monitoring module and the remote monitoring system, allowing users to intuitively understand the power consumption of each line, and at the same time it can also promote the intelligent management of equipment power consumption.

[0078] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A monitoring system for a power distribution unit, comprising a power distribution unit (1) and a monitoring module (2), wherein the monitoring module (2) is connected to the power distribution unit (1), and characterized in that: The power distribution unit (1) is used to distribute power to a load; The monitoring module (2) is used to locally and remotely monitor the power parameters of the power distribution unit. The monitoring module (2) is provided with a power parameter measurement circuit (21). The power parameter measurement circuit (21) is used to measure the power parameters to obtain power parameter measurement results.

2. The monitoring system of the power distribution unit according to claim 1, characterized in that: The power distribution unit (1) comprises a plurality of power distribution circuits connected to the monitoring module (2), each power distribution circuit comprising a first-level distribution circuit and a second-level distribution circuit, the first-level distribution circuit comprising an incoming terminal and a main switch, the monitoring module (2) being connected to one end of the incoming terminal, the other end of the incoming terminal being connected to one end of the main switch, and the other end of the main switch being connected to the second-level distribution circuit.

3. The monitoring system of the power distribution unit according to claim 2, characterized in that: The second-level distribution loop includes a plurality of parallel current branches, each of which is provided with a shunt, a branch switch and a load terminal, the other end of the main switch is connected to one end of the shunt, the other end of the shunt is connected to one end of the branch switch, the other end of the branch switch is connected to the load terminal, and the monitoring module (2) is also connected to the shunt and the branch switch respectively.

4. The monitoring system of the power distribution unit according to claim 1, characterized in that: The monitoring module (2) is also provided with a single-chip microcomputer (22) for controlling the power parameter measurement circuit (21); the single-chip microcomputer (22) is connected to the power parameter measurement circuit (21).

5. The monitoring system of the power distribution unit according to claim 4, characterized in that: The electric power parameter measurement circuit (21) comprises a voltage measurement circuit (211), a current measurement circuit (212) and a switch value input detection circuit (213); the voltage measurement circuit (211), the current measurement circuit (212) and the switch value input detection circuit (213) are respectively bidirectionally connected to the single chip computer (22).

6. The monitoring system of the power distribution unit according to claim 5, characterized in that: The electric power parameter measurement circuit (21) further comprises a voltage measurement channel switching circuit (214) and a current measurement channel switching circuit (215); the output end of the single chip computer (22) is respectively connected to the input ends of the voltage measurement channel switching circuit (214) and the current measurement channel switching circuit (215); the output end of the voltage measurement channel switching circuit (214) is connected to the voltage measurement circuit (211); and the output end of the current measurement channel switching circuit (215) is connected to the current measurement circuit (212).

7. The monitoring system of the power distribution unit according to claim 4, characterized in that: A buzzer drive circuit (23) is also provided in the monitoring module (2), and the buzzer drive circuit (23) is connected to the single chip computer (22).

8. The monitoring system of the power distribution unit according to claim 4, characterized in that: The monitoring module (2) also has an indicator light driving circuit (24), and the indicator light driving circuit (24) is connected to the single chip computer (22).

9. The monitoring system of a power distribution unit according to claim 4, characterized in that: The monitoring module (2) also has a serial communication circuit (25), the single chip computer (22) is bidirectionally connected to the serial communication circuit (25), and the serial communication circuit (25) is connected to a remote monitoring system via a protocol converter.

10. The monitoring system of a power distribution unit according to claim 4, characterized in that: The monitoring module (2) also has a display unit (26), and the display unit (26) is bidirectionally connected to the single-chip computer (22).

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