A power supply monitoring system

Abstract

The embodiment of the application discloses a power supply monitoring system, which comprises a data acquisition board, the data acquisition board comprises a power supply bus and a plurality of power supply branch feeders which are electrically connected with the power supply bus; an electromagnetic air switch, an on-board leakage current sensor, a first on-board current sensor and a voltage detection circuit are arranged on each power supply branch feeder; a second on-board current sensor, an alternating current intrusion detection circuit and a resistance control circuit are further arranged on the data acquisition board and are electrically connected with the power supply bus; in the same monitoring unit, a processor is electrically connected with a signal conditioning circuit, the signal conditioning circuit acquires power supply data and transmits the power supply data to the processor, and the processor controls the switching state of the electromagnetic air switch according to the power supply data. The DC feeder screen is highly integrated and intelligent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current screen power supply, and particularly relates to a power supply monitoring system. BACKGROUND

[0002] The direct current screen is an important component of the power system in the power plant and the transformer substation, and the stability and reliability thereof are directly related to the normal operation of the power system. The direct current feeder screen, as the direct current output of the direct current screen, mainly supplies power to the direct current devices, circuit breakers, emergency lighting and other devices in the station. At present, the direct current feeder screen has multiple branch direct current outputs, and the number of branches is usually within 60, and in some cases, the number of branches exceeds 60. The direct current outputs of the branches are monitored by multiple independent modules of different types, such as a branch power detection module for detecting the on-off of the branch, an insulation resistance detection module for detecting the insulation resistance, and a current detection module for detecting the current in the line. The structure is relatively disordered, and the modules are connected by wires, which is prone to cause misconnection and is not convenient for overall debugging. In addition, the direct current feeder screen on the market has low integration and low intelligence. SUMMARY

[0003] The present application provides a power supply monitoring system, which realizes high integration and high intelligence of the direct current feeder screen.

[0004] According to an aspect of the present application, a power supply monitoring system is provided, comprising:

[0005] at least one monitoring unit, each monitoring unit comprising a data acquisition board and a data processing board;

[0006] The data acquisition board comprises a power supply bus and a plurality of power supply branch feeders electrically connected to the power supply bus; an electromagnetic air switch, an on-board leakage current sensor, a first on-board current sensor and a voltage detection circuit are arranged on each power supply branch feeder;

[0007] The on-board leakage current sensor is used for detecting the branch leakage current on the power supply branch feeder;

[0008] The first on-board current sensor is used for detecting the branch current on the power supply branch feeder;

[0009] The voltage detection circuit is used for detecting the branch voltage of the power supply branch;

[0010] A second on-board current sensor, an alternating current intrusion detection circuit and a resistance control circuit are further arranged on the data acquisition board, and the second on-board current sensor, the alternating current intrusion detection circuit and the resistance control circuit are electrically connected to the power supply bus;

[0011] The second on-board current sensor is used for detecting the bus current on the power supply bus;

[0012] The alternating current intrusion detection circuit is used for detecting the alternating current intruding into the power supply bus, detecting the bus voltage value of the bus and the ground voltage value of the bus;

[0013] The electric resistance control circuit is used for controlling the resistance value between the bus and the ground;

[0014] The data processing board is provided with a processor and a signal conditioning circuit;

[0015] In the same monitoring unit:

[0016] The processor is electrically connected with the signal conditioning circuit, and the signal conditioning circuit is electrically connected with the electromagnetic air switch, the on-board leakage current sensor, the first on-board current sensor, the voltage detection circuit, the second on-board current sensor, the alternating current intrusion detection circuit and the electric resistance control circuit on the data acquisition board;

[0017] The signal conditioning circuit is used for acquiring the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value, and transmitting the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value to the processor;

[0018] The processor is used for controlling the switching state of the electromagnetic air switch according to the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value.

[0019] Optionally, the processor is used for calculating the branch insulation resistance value of each branch, the branch power of each branch, the bus power and the bus insulation resistance value according to the branch leakage current, the branch current, the branch voltage, the bus current, the bus voltage value, the ground voltage value and the resistance value, and controlling the switching state of the electromagnetic air switch according to the branch insulation resistance value, the branch power, the branch current, the bus power, the bus insulation resistance value and the alternating current intruding into the power supply bus.

[0020] Optionally, the processor is used for:

[0021] When the branch insulation resistance exceeds a first set resistance value, the electromagnetic air switch on the power supply branch feeder is controlled to be turned off;

[0022] When the bus insulation resistance value exceeds a second set resistance value or the alternating current intrudes into the power supply bus, the electromagnetic air switches on all power supply branch feeders connected with the bus are controlled to be turned off;

[0023] When the branch power or the bus power exceeds a set power value, an alarm is sent out.

[0024] Optionally, the processor is configured to compare each branch current with the current waveforms in the fault and sub-health knowledge base under different power supply states when the branch insulation resistance and the busbar insulation resistance both meet the requirements and no AC power is introduced into the power supply bus, and determine the power supply state of the power supply branch feeder according to the comparison result.

[0025] Optionally, the processor is configured to determine that the power supply branch feeder is working normally when the branch current is consistent with the current waveform under the normal power supply state in the fault and sub-health knowledge base, determine that the power supply branch feeder has a fault and control the electromagnetic air switch on the power supply branch feeder to be turned off when the branch current is consistent with the current waveform under the fault state in the fault and sub-health knowledge base, determine that the power supply branch is working in a sub-health state when the branch current is consistent with the current waveform under the sub-health power supply state in the fault and sub-health knowledge base, and send a prompt information to the staff when the branch current is inconsistent with the current waveforms in the fault and sub-health knowledge base.

[0026] Optionally, the processor is configured to report the power supply state to a monitoring platform.

[0027] Optionally, the signal conditioning circuit comprises an insulation resistance detection control circuit, an AC introduction conditioning circuit, a busbar voltage conditioning circuit, a busbar current conditioning circuit, a branch current conditioning circuit, a branch voltage conditioning circuit, a branch leakage current conditioning circuit and an analog-to-digital converter.

[0028] The insulation resistance detection control circuit is electrically connected with the resistance control circuit, the AC introduction detection circuit and the processor, the AC introduction conditioning circuit is electrically connected with the AC introduction detection circuit and the analog-to-digital converter, the busbar voltage conditioning circuit is electrically connected with the resistance control circuit and the analog-to-digital converter, the busbar current conditioning circuit is electrically connected with the second on-board current sensor and the analog-to-digital converter, the branch current conditioning circuit is electrically connected with the first on-board current sensor and the analog-to-digital converter, the branch voltage conditioning circuit is electrically connected with the voltage detection circuit and the analog-to-digital converter, and the branch leakage current conditioning circuit is electrically connected with the on-board leakage current sensor and the analog-to-digital converter.

[0029] The insulation resistance detection control circuit is configured to obtain the insulation resistance values of the positive busbar and the negative busbar to ground, obtain the voltage values of the positive busbar and the negative busbar to ground when different resistance values are introduced by using the resistance control circuit and the AC introduction detection circuit, and calculate the busbar insulation resistance value by using the simultaneous equations, and transmit the busbar insulation resistance value to the processor.

[0030] The AC introduction conditioning circuit is configured to obtain the AC power introduced into the power supply bus, the busbar voltage value and the voltage to ground detected by the AC introduction detection circuit, and transmit the AC power introduced into the power supply bus, the busbar voltage value and the voltage to ground to the analog-to-digital converter.

[0031] The bus voltage conditioning circuit is configured to obtain the resistance value detected by the resistance control circuit and transmit the resistance value to the analog-to-digital converter.

[0032] The bus current conditioning circuit is configured to obtain the bus current detected by the second on-board current sensor and transmit the bus current to the analog-to-digital converter.

[0033] The branch current conditioning circuit is configured to obtain the branch current detected by the first on-board current sensor and transmit the branch current to the analog-to-digital converter.

[0034] The branch voltage conditioning circuit is configured to obtain the branch voltage detected by the voltage detection circuit and transmit the branch voltage to the analog-to-digital converter.

[0035] The branch leakage current conditioning circuit is configured to obtain the branch leakage current detected by the on-board leakage current sensor and transmit the branch leakage current to the analog-to-digital converter.

[0036] The analog-to-digital converter and the processor are electrically connected.

[0037] The analog-to-digital converter is configured to perform analog-to-digital conversion on the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current flowing into the power bus, the bus voltage value, the voltage-to-ground value, and the resistance value, and transmit the converted values to the processor.

[0038] Optionally, the data processing board further comprises a CAN communication interface, an RS485 communication interface, and a short-range wireless module.

[0039] When the power supply monitoring system comprises at least two monitoring units, the data processing boards of different monitoring units are connected in sequence through at least one of the CAN communication interface, the RS485 communication interface, and the short-range wireless module.

[0040] The processor of each data processing board is configured to transmit the power supply data and the power supply state to the processor of the data processing board of the next-level monitoring unit, and the processor of the data processing board of the last-level monitoring unit is configured to transmit the received power supply data and power supply state to the monitoring platform. The power supply data comprises the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current flowing into the power bus, the bus voltage value, the voltage-to-ground value, and the resistance value.

[0041] Optionally, the data processing board further comprises an Ethernet communication interface and a 4G / 5G module.

[0042] The processor of the data processing board of the last-level monitoring unit is configured to transmit the received power supply data and power supply state to the monitoring platform through at least one of the CAN communication interface, the RS485 communication interface, the Ethernet communication interface, and the 4G / 5G module.

[0043] Optionally, the data acquisition board and the data processing board are connected through a power strip.

[0044] The power supply monitoring system provided by the embodiment of the application comprises at least one monitoring unit, each monitoring unit comprises a data acquisition board and a data processing board; the data acquisition board comprises a power supply bus and a plurality of power supply branch feeders electrically connected with the power supply bus; an electromagnetic air switch, an on-board leakage current sensor, a first on-board current sensor and a voltage detection circuit are arranged on each power supply branch feeder; a processor and a signal conditioning circuit are arranged on the data processing board; in the same monitoring unit: the processor is electrically connected with the signal conditioning circuit, the signal conditioning circuit is electrically connected with the electromagnetic air switch, the on-board leakage current sensor, the first on-board current sensor, the voltage detection circuit, a second on-board current sensor, an alternating current intrusion detection circuit and a resistance control circuit on the data acquisition board; the signal conditioning circuit is used for acquiring branch leakage current, branch current, branch voltage, bus current, alternating current intruding on the power supply bus, bus voltage value, ground voltage value and resistance resistance value, and transmitting the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding on the power supply bus, the bus voltage value, the ground voltage value and the resistance resistance value to the processor; the processor is used for controlling the switching state of the electromagnetic air switch according to the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding on the power supply bus, the bus voltage value, the ground voltage value and the resistance resistance value. In this embodiment, the electromagnetic air switch, the on-board leakage current sensor, the first on-board current sensor, the voltage detection circuit, the second on-board current sensor, the alternating current intrusion detection circuit and the resistance control circuit are integrated on the data acquisition board, the processor and the signal conditioning circuit are integrated on the data processing board, so that the entire circuit board can realize all functions without the need of wiring connection, is highly integrated, greatly reduces the difficulty of on-site assembly and debugging, improves the efficiency, realizes comprehensive monitoring and protection of the power supply system. The monitoring unit adopts modular design, is easy to expand and upgrade. At the same time, since each sensor and circuit is integrated on the data acquisition board, it is convenient to maintain and replace. The processor can make intelligent decisions according to the collected data, control the switching state of the electromagnetic air switch, realize automatic protection and recovery of the circuit, improve the reliability and stability of the power supply system, and realize high integration and high intelligence of the DC feeder screen.

[0045] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below only show some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0047] Figure 1 is a schematic diagram of a power supply monitoring system module provided by the embodiment of the present application;

[0048] Figure 2 is an expansion diagram of a power supply monitoring system provided by the embodiment of the present application;

[0049] Figure 3 is a flowchart of a power supply monitoring system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the person skilled in the art better understand the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should be within the scope of protection of the present application.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0052] The embodiment of the present application provides a power supply monitoring system, Figure 1 is a schematic diagram of a power supply monitoring system module provided by the embodiment of the present application, referring to Figure 1 , the power supply monitoring system comprises:

[0053] at least one monitoring unit, each monitoring unit comprising a data acquisition board 10 and a data processing board 20;

[0054] The data acquisition board 10 comprises a power supply bus and a plurality of power supply branch feeders electrically connected with the power supply bus; each power supply branch feeder is provided with an electromagnetic air switch 11, an on-board leakage current sensor 12, a first on-board current sensor 13 and a voltage detection circuit 14;

[0055] The on-board leakage current sensor 12 is used for detecting the branch leakage current on the power supply branch feeder;

[0056] The first on-board current sensor 13 is used for detecting the branch current on the power supply branch feeder;

[0057] The voltage detection circuit 14 is used for detecting the branch voltage of the power supply branch;

[0058] The data acquisition board 10 is further provided with a second on-board current sensor 15, an alternating current intrusion detection circuit 16 and a resistance control circuit 17, and the second on-board current sensor 15, the alternating current intrusion detection circuit 16 and the resistance control circuit 17 are electrically connected with the power supply bus;

[0059] The second on-board current sensor 15 is used for detecting the bus current on the power supply bus;

[0060] The alternating current intrusion detection circuit 16 is used for detecting the alternating current intruding into the power supply bus, detecting the bus voltage value of the bus and the ground voltage value of the bus;

[0061] The resistance control circuit 17 is used for controlling the resistance value between the bus and the ground;

[0062] The data processing board 20 is provided with a processor 30 and a signal conditioning circuit 70;

[0063] In the same monitoring unit:

[0064] The processor 30 is electrically connected with the signal conditioning circuit 70, and the signal conditioning circuit 70 is electrically connected with the electromagnetic air switch 11, the on-board leakage current sensor 12, the first on-board current sensor 13, the voltage detection circuit 14, the second on-board current sensor 15, the alternating current intrusion detection circuit 16 and the resistance control circuit 17 on the data acquisition board 10;

[0065] The signal conditioning circuit 70 is used for acquiring the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value, and transmitting the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value to the processor 30;

[0066] The processor 30 is configured to control the switching state of the electromagnetic air switch 11 according to the branch leakage current, the branch current, the branch voltage, the bus current, the AC power surging into the power supply bus, the bus voltage value, the ground voltage value, and the resistance value.

[0067] The on-board leakage current sensor 12 can be a closed-loop magnetic flux gate on-board leakage current sensor 12, the data acquisition board 10 supports DC 110V, DC 220V, DC 48V and AC 220V input, and can support a maximum of 100A continuous current input. The feeder output end 19 can support both 32A current output and 64A current output. The system takes power from the bus end, supports AC and DC input, and converts the required 5V and ±12V power supply through the AC / DC power module 50. The processor 30 uses a high-performance processor RK3568, which detects the output of each branch feeder while collecting the branch leakage current, the branch current, the branch voltage, the bus current, the AC power surging into the power supply bus, the bus voltage value, the ground voltage value, and the resistance value, and calculates the operating state of each branch and bus. In the data acquisition board 10, IN1-IN12 are control signals sent by the data processing board 20 to the electromagnetic air switch 11, I1-I12 are leakage currents output by the on-board leakage current sensor 12 on the multiple power supply branch feeders, which are transmitted to the branch leakage current conditioning circuit 27 in the data processing board 20; LI1-LI12 are currents output by the first on-board current sensor 13 on the multiple power supply branch feeders, which are transmitted to the branch current conditioning circuit 25 in the data processing board 20; MI1 is a current output by the second on-board current sensor 15 on the bus negative, MI2 is a current output by the second on-board current sensor 15 on the bus positive, and MI1 and MI2 are both transmitted to the bus current conditioning circuit 24 in the data processing board 20; LV1-LV12 are voltages output by the voltage detection circuit 14 on the multiple power supply branch feeders, which are transmitted to the branch voltage conditioning circuit 26 in the data processing board 20.

[0068] Specifically, the electromagnetic air switch 11 on each power supply branch circuit controls the on-off state of the circuit, the indicator light 18 indicates whether each branch is in normal working condition, the on-board leakage current sensor 12 detects the branch leakage current, the first on-board current sensor 13 detects the branch current, the voltage detection circuit 14 detects the branch voltage, the second on-board current sensor 15 detects the bus current on the power supply bus, the AC intrusion detection circuit 16 detects whether AC has intruded into the power supply bus, measures the bus voltage value and the ground voltage value, the resistance control circuit 17 controls the resistance value between the bus and the ground according to the preset conditions or the instructions of the processor 30, and is used to adjust or detect certain specific electrical parameters; the signal conditioning circuit receives the analog signals transmitted from each sensor and circuit on the data acquisition board 10, performs filtering, amplification, conversion and other processing to ensure that the signal quality is suitable for subsequent processing by the processor 30. The processed signals (including branch leakage current, branch current, branch voltage, bus current, AC intruded into the power supply bus, bus voltage value, ground voltage value, and resistance value) are transmitted to the processor 30, the processor 30 receives the data transmitted by the signal conditioning circuit 70, analyzes and judges according to the preset conditions, and according to the analysis result, the processor 30 decides whether to control the on-off state of the electromagnetic air switch 11 to realize the on-off control of the power supply branch, thereby protecting the circuit safety or responding to abnormal conditions.

[0069] The power supply monitoring system provided by the embodiment of the application comprises at least one monitoring unit, each monitoring unit comprising a data acquisition board 10 and a data processing board 20; the data acquisition board 10 comprises a power supply bus and a plurality of power supply branch feeders electrically connected to the power supply bus; each power supply branch feeder is provided with an electromagnetic air switch 11, an on-board leakage current sensor 12, a first on-board current sensor 13 and a voltage detection circuit 14; the data processing board 20 is provided with a processor 30 and a signal conditioning circuit 70; in the same monitoring unit: the processor 30 is electrically connected to the signal conditioning circuit 70, and the signal conditioning circuit 70 is electrically connected to the electromagnetic air switch 11, the on-board leakage current sensor 12, the first on-board current sensor 13, the voltage detection circuit 14, a second on-board current sensor 15, an alternating current intrusion detection circuit 16 and a resistance control circuit 17 on the data acquisition board 10; the signal conditioning circuit 70 is used to acquire branch leakage current, branch current, branch voltage, bus current, alternating current intruding into the power supply bus, bus voltage value, ground voltage value and resistance resistance value, and transmit the branch leakage current, branch current, branch voltage, bus current, alternating current intruding into the power supply bus, bus voltage value, ground voltage value and resistance resistance value to the processor 30; the processor 30 is used to control the switching state of the electromagnetic air switch 11 according to the branch leakage current, branch current, branch voltage, bus current, alternating current intruding into the power supply bus, bus voltage value, ground voltage value and resistance resistance value. In this embodiment, the electromagnetic air switch 11, the on-board leakage current sensor 12, the first on-board current sensor 13, the voltage detection circuit 14, the second on-board current sensor 15, the alternating current intrusion detection circuit 16 and the resistance control circuit 17 are integrated on the data acquisition board 10, and the processor 30 and the signal conditioning circuit 70 are integrated on the data processing board 20, so that the entire circuit board can realize all functions without wiring connection, is highly integrated, greatly reduces the difficulty of on-site assembly and debugging, improves the efficiency, realizes comprehensive monitoring and protection of the power supply system. The monitoring unit adopts modular design and is easy to expand and upgrade. At the same time, since each sensor and the acquisition circuit are integrated on the data acquisition board 10, it is convenient to maintain and replace. The processor 30 can make intelligent decisions according to the collected data, control the switching state of the electromagnetic air switch 11, realize automatic protection and recovery of the circuit, improve the reliability and stability of the power supply system, and realize high integration and high intelligence of the DC feeder screen.

[0070] Optionally, the processor 30 is used to calculate the branch insulation resistance value of each branch, the branch power of each branch, the bus power and the bus insulation resistance value according to the branch leakage current, the branch current, the branch voltage, the bus current, the bus voltage value, the ground voltage value and the resistance resistance value, and control the switching state of the electromagnetic air switch 11 according to the branch insulation resistance value, the branch power, the branch current, the bus power, the bus insulation resistance value and the alternating current intruding into the power supply bus.

[0071] Wherein, the branch insulation resistance value is calculated by collecting the bus voltage value and the branch leakage current, and solving the equation set. The branch power is calculated by the product of the branch voltage and the branch current. The bus power is calculated by the product of the bus voltage and the bus current. The bus insulation resistance value is calculated by the resistance value between the positive and negative bus and the ground, and the bus voltage value, and solving the equation set.

[0072] Specifically, the processor 30 receives various electrical parameters from the data acquisition board 10 through the signal conditioning circuit, including the branch leakage current, the branch current, the branch voltage, the bus current, the bus voltage value, the ground voltage value, and the resistance value. The processor 30 checks, filters, and normalizes these raw data to ensure the accuracy and reliability of the data. The insulation resistance value of each branch is calculated by using the bus voltage value and the branch leakage current, and solving the equation set. The insulation resistance value reflects the insulation performance of the branch to the ground. The power of each branch is calculated by using the branch voltage and the branch current through the power formula (P=UI). The power value reflects the energy consumption of the branch. The power of the bus is calculated by using the bus voltage and the bus current through the power formula (P=UI). The power value reflects the energy consumption of the bus. The bus insulation resistance value is calculated by using the resistance value between the positive and negative bus and the ground, and the bus voltage value, and solving the equation set. The processor 30 compares the calculated branch insulation resistance value, branch power, bus power, branch current, and bus insulation resistance value with the set value, or judges whether the AC power has been introduced into the power supply bus. If the branch insulation resistance value, branch power, bus power, branch current, and bus insulation resistance value exceed the limit value or the AC power has been introduced into the power supply bus, the processor 30 makes a control decision. The processor 30 sends a control signal to the electromagnetic air switch 11 to disconnect the corresponding branch or bus to protect the safety of the circuit and equipment. The processor can also report the abnormal situation and various data to the monitoring platform.

[0073] Optionally, the processor 30 is configured to:

[0074] When the branch insulation resistance exceeds a first set resistance value, control the electromagnetic air switch 11 on the power supply branch feeder to be disconnected;

[0075] When the bus insulation resistance value exceeds a second set resistance value, or the AC power has been introduced into the power supply bus, control the electromagnetic air switch 11 on all power supply branch feeders connected to the bus to be disconnected;

[0076] When the branch power or the bus power exceeds a set power value, an alarm is issued.

[0077] Specifically, after the power supply monitoring system is started, the processor 30 is initialized, and the preset first set resistance value, second set resistance value and set power value and other parameters are loaded. The processor 30 is connected to and monitors each sensor in the power supply system, and calculates the branch insulation resistance, busbar insulation resistance, whether the alternating current is introduced into the power supply busbar, the busbar power and the branch power and other data. If the insulation resistance value of a power supply branch exceeds the first set resistance value, the processor 30 immediately judges that there is a risk such as leakage or insulation damage in the branch, and the processor 30 sends a control signal to make the electromagnetic air switch 11 on the power supply branch feeder line be disconnected, so as to cut off the power supply of the fault branch and prevent potential safety accidents. If the busbar insulation resistance value exceeds the second set resistance value, or the alternating current is detected to be introduced into the power supply busbar, the processor 30 judges that there is a risk such as instability of the busbar system or damage of the equipment, and the processor 30 sends a control signal to make all the electromagnetic air switches 11 on the power supply branch feeder lines connected with the busbar be disconnected, so as to ensure the safety of the entire power supply system. If the power of a power supply branch or the busbar power exceeds the set power value, the processor 30 judges that there is a risk such as overload operation or abnormal fluctuation of the branch or busbar, which may damage the equipment or cause a fire, and the processor 30 does not directly cut off the power supply, but sends an alarm signal (such as audible and light alarm, sending a short message or email notification, etc.) to remind the operation and maintenance personnel to take timely measures to handle the overload problem.

[0078] Optionally, the processor 30 is configured to compare each branch current with the current waveforms in the fault and sub-health knowledge base under different power supply states when the branch insulation resistance and the busbar insulation resistance meet the requirements and no alternating current is introduced into the power supply busbar, and determine the power supply state of the power supply branch feeder line according to the comparison result.

[0079] In the method, the current waveform data under abnormal conditions can be simulated by using each fault load, so as to establish the fault and sub-health knowledge base of each load.

[0080] Specifically, under the condition that the branch insulation resistance and the busbar insulation resistance meet the requirements and no alternating current is introduced into the power supply busbar, the processor 30 collects the current data of each branch, and compares the collected current waveform with the current waveforms in the fault and sub-health knowledge base under different power supply states, to identify whether the current waveform of the current power supply branch feeder line matches a certain fault or sub-health state in the knowledge base. According to the comparison result, the processor 30 determines the power supply state of the power supply branch feeder line. If the current waveform matches the fault waveform in the knowledge base, it is judged that the branch has a fault; if it matches the sub-health waveform, it is judged that the branch is in a sub-health state; and if it matches the normal waveform, it is judged that the branch is in a normal power supply state.

[0081] Optionally, the processor 30 is configured to determine that the power supply branch feeder is normal when the branch current is consistent with the current waveform in the normal power supply state in the fault and sub-health knowledge base, determine that the power supply branch feeder has a fault and control the electromagnetic air switch 11 on the power supply branch feeder to be disconnected when the branch current is consistent with the current waveform in the fault state in the fault and sub-health knowledge base, and determine that the power supply branch is working in a sub-health state when the branch current is consistent with the current waveform in the sub-health power supply state in the fault and sub-health knowledge base, and send a prompt message to the staff when the branch current is inconsistent with the current waveform in the fault and sub-health knowledge base.

[0082] Specifically, if the current waveform is consistent with the normal power supply state waveform in the knowledge base, the processor 30 determines that the branch feeder is normal. If the current waveform is consistent with the fault state waveform in the knowledge base, the processor 30 determines that the branch feeder has a fault. The processor 30 will immediately send a control signal to make the electromagnetic air switch 11 on the branch feeder disconnected to cut off the power supply of the fault branch and prevent the fault from spreading or causing a larger safety accident. If the current waveform is consistent with the sub-health power supply state waveform in the knowledge base, the processor 30 determines that the branch feeder is working in a sub-health state. When it is determined that the branch feeder has a fault or is in a sub-health state, the processor 30 will immediately send an alarm signal (such as an audible and visual alarm, send a short message or email notification, etc.) to remind the operation and maintenance personnel to take timely measures for processing.

[0083] Optionally, the processor 30 is configured to determine the power supply state and report to the monitoring platform.

[0084] Specifically, the processor 30 determines the power supply state by comparing and analyzing the collected data using the knowledge base and sends it to the monitoring platform through the communication network.

[0085] Optionally, the signal conditioning circuit includes an insulation resistance detection control circuit 21, an alternating current intrusion conditioning circuit 22, a bus voltage conditioning circuit 23, a bus current conditioning circuit 24, a branch current conditioning circuit 25, a branch voltage conditioning circuit 26, a branch leakage current conditioning circuit 27, and an analog-to-digital converter 28.

[0086] The insulation resistance detection control circuit 21 is electrically connected with the injection resistance control circuit 17, the AC intrusion detection circuit 16 and the processor 30 respectively, the AC intrusion conditioning circuit 22 is electrically connected with the AC intrusion detection circuit 16 and the analog-digital converter 28 respectively, the bus voltage conditioning circuit 23 is electrically connected with the injection resistance control circuit 17 and the analog-digital converter 28 respectively, the branch current conditioning circuit 24 is electrically connected with the second on-board current sensor 15 and the analog-digital converter 28 respectively, the branch current conditioning circuit 25 is electrically connected with the first on-board current sensor 13 and the analog-digital converter 28 respectively, the branch voltage conditioning circuit 26 is electrically connected with the voltage detection circuit 14 and the analog-digital converter 28 respectively, and the branch leakage current conditioning circuit 27 is electrically connected with the on-board leakage current sensor 12 and the analog-digital converter 28 respectively;

[0087] The insulation resistance detection control circuit 21 is used for obtaining the insulation resistance value of the positive and negative bus to the ground, and obtaining the voltage value of the positive and negative bus to the ground when different resistance values are injected by using the injection resistance control circuit 17 and the AC intrusion detection circuit 16, so as to calculate the bus insulation resistance value by using simultaneous equations, and transmit the bus insulation resistance value to the processor 30;

[0088] The AC intrusion conditioning circuit 22 is used for obtaining the AC power, the bus voltage value and the ground voltage value of the power supply bus detected by the AC intrusion detection circuit 16, and transmitting the AC power, the bus voltage value and the ground voltage value of the power supply bus to the analog-digital converter 28;

[0089] The bus voltage conditioning circuit 23 is used for obtaining the resistance value detected by the injection resistance control circuit 17, and transmitting the resistance value to the analog-digital converter 28;

[0090] The bus current conditioning circuit 24 is used for obtaining the bus current detected by the second on-board current sensor 15, and transmitting the bus current to the analog-digital converter 28;

[0091] The branch current conditioning circuit 25 is used for obtaining the branch current detected by the first on-board current sensor 13, and transmitting the branch current to the analog-digital converter 28;

[0092] The branch voltage conditioning circuit 26 is used for obtaining the branch voltage detected by the voltage detection circuit 14, and transmitting the branch voltage to the analog-digital converter 28;

[0093] The branch leakage current conditioning circuit 27 is used for obtaining the branch leakage current detected by the on-board leakage current sensor 12, and transmitting the branch leakage current to the analog-digital converter 28;

[0094] The analog-digital converter 28 and the processor 30 are electrically connected;

[0095] The analog-to-digital converter 28 is used to convert the branch leakage current, the branch current, the branch voltage, the bus current, the AC power surges on the power bus, the bus voltage value, the ground voltage value and the resistance value into digital signals, and then transmit the digital signals to the processor 30.

[0096] Specifically, the insulation resistance detection control circuit 21 obtains the insulation resistance value of the positive and negative bus to ground, and obtains the voltage value of the positive and negative bus to ground when different resistance values are put in by using the put-in resistance control circuit 17 and the AC surge detection circuit 16. The bus insulation resistance value is calculated by solving the equation set, and the bus insulation resistance value is transmitted to the processor 30. The AC surge detection circuit 16 detects whether AC power surges on the power bus, and measures the bus voltage value and the ground voltage value. The AC surge conditioning circuit 22 conditions the AC power surges on the power bus, the bus voltage value and the ground voltage value, and transmits the conditioned signals to the analog-to-digital converter 28. The bus voltage conditioning circuit 23 obtains the resistance value related to the bus voltage through the put-in resistance control circuit 17. The bus current conditioning circuit 24 obtains the bus current value from the second on-board current sensor 15. The conditioned bus voltage and current signals are transmitted to the analog-to-digital converter 28. The branch current conditioning circuit 25 obtains the branch current value from the first on-board current sensor 13. The branch voltage conditioning circuit 26 obtains the branch voltage value from the voltage detection circuit 14. The conditioned branch current and voltage signals are transmitted to the analog-to-digital converter 28. The branch leakage current conditioning circuit 27 obtains the branch leakage current value from the on-board leakage current sensor 12. The conditioned branch leakage current signal is transmitted to the analog-to-digital converter 28. The analog-to-digital converter 28 receives all analog signals from the signal conditioning circuit, and converts all analog signals into digital signals. The converted digital signals are transmitted to the processor 30 for subsequent processing and analysis. The processor 30 determines the state of the power supply system according to the received digital signals. If the processor 30 detects any abnormality or fault, the processor 30 will trigger the corresponding early warning or alarm mechanism to notify the operation and maintenance personnel or the monitoring platform.

[0097] Figure 2 is an expansion diagram of a power supply monitoring system provided by an embodiment of the present application, referring to Figure 2 The data processing board 20 further comprises a CAN communication interface 31, an RS485 communication interface 32 and a short-range wireless module 33.

[0098] When the power supply monitoring system comprises at least two monitoring units, the data processing boards 20 of different monitoring units are sequentially connected through at least one of the CAN communication interface 31, the RS485 communication interface 32 and the short-range wireless module 33.

[0099] The processor 30 of the data processing board 20 of each monitoring unit is configured to transmit the power supply data and the power supply state to the processor 30 of the data processing board 20 of the next-level monitoring unit, and the processor 30 of the data processing board 20 of the last-level monitoring unit is configured to transmit the received power supply data and power supply state to the monitoring platform; the power supply data includes branch leakage current, branch current, branch voltage, bus current, AC power surging into the power supply bus, bus voltage value, ground voltage value, and resistance value.

[0100] Specifically, the data processing board 20 of each monitoring unit collects branch leakage current, branch current, branch voltage, bus current, AC power surging into the power supply bus, bus voltage value, ground voltage value, and resistance value of the power supply system through the respective sensors and signal conditioning circuits. The processor 30 pre-processes the collected data to ensure the accuracy and reliability of the data. The processor 30 transmits the processed power supply data and power supply state to the processor 30 of the data processing board 20 of the next-level monitoring unit through the selected communication interface, and the transmission is performed level by level until the last-level monitoring unit. The data transmission between different monitoring units is realized through the CAN communication interface 31, the RS485 communication interface 32, or the short-range wireless module 33. The processor 30 of the last-level monitoring unit collects all the data transmitted by the upper-level monitoring units, and summarizes and arranges all the received data and the power supply data and power supply state of itself. The processor 30 of the last-level monitoring unit uploads the summarized power supply data and power supply state to the monitoring platform through the selected communication mode.

[0101] Optionally, the data processing board 20 further comprises an Ethernet communication interface 34 and a 4G / 5G module 35.

[0102] The processor 30 of the data processing board 20 of the last-level monitoring unit is configured to transmit the received power supply data and power supply state to the monitoring platform through at least one of the CAN communication interface 31, the RS485 communication interface 32, the Ethernet communication interface 34, and the 4G / 5G module 35.

[0103] Specifically, the processor 30 of the last-level monitoring unit collects all the data transmitted by the upper-level monitoring units, and summarizes and arranges the data. The processor 30 of the last-level monitoring unit uploads the summarized power supply data and power supply state to the monitoring platform through at least one of the CAN communication interface 31, the RS485 communication interface 32, the Ethernet communication interface 34, and the 4G / 5G module 35. The monitoring platform can further analyze, store, and display the power supply data and the power supply state.

[0104] Since the single data acquisition board 10 supports 12 branch feeder outputs, if 36 or 60 straight-line outputs are needed, multiple monitoring units (consisting of the data acquisition board 10 and the data processing board 20) are used to expand through the CAN communication interface 31 and the RS485 communication interface 32, and the expanded data is processed by a data processing board to realize efficient and unified processing and uploading of the data. The 4G / 5G module 35 of the data processing board 20 can send the collected raw data and the data processing result to the monitoring platform. Data transmission can also be performed through the Ethernet communication interface 34.

[0105] Optionally, the data acquisition board 10 and the data processing board 20 are connected through the power strip 40.

[0106] Specifically, the two boards are connected into a whole through the 30-pin power strip 40 terminals in the data acquisition board 10 and the 30-pin power strip 40 terminals in the data processing board 20.

[0107] Figure 3 is a flowchart of a power supply monitoring system provided by an embodiment of the present application, referring to Figure 3 First, the number of branches needed is determined, and the system is configured, including determining the number of monitoring units needed, electrically connecting the processor and the signal conditioning circuit, etc. After the system self-checking is completed, the data of the busbar and each branch, including voltage, current, leakage current, etc. is collected. The processor calculates the insulation resistance of the busbar and the branch, respectively, and judges whether there is alternating current intrusion. If the insulation resistance is out of limit or there is alternating current intrusion, the processor controls the electromagnetic air switch to disconnect the abnormal branch output. If the insulation resistance is not out of limit or there is no alternating current intrusion, the processor records the data of each feeder output load in real time. The data of each feeder output load is compared and analyzed with the fault and sub-health knowledge base to determine whether it is consistent. If not, the human is notified to handle the on-site fault. If it is consistent, the comparison result is consistent with the fault model, the processor controls the electromagnetic air switch to disconnect the abnormal branch output, and reports the information to the monitoring platform. If the comparison result is consistent with the sub-health model, the processor issues a sub-health prediction, and reports the information to the monitoring platform. If the data is normal, the branch is normally output, and the information is reported to the monitoring platform through the wireless transmission mode.

[0108] It should be understood that the various forms of the flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0109] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the application shall be included in the scope of the application.

Claims

1. A power supply monitoring system, characterized by, The power supply monitoring system comprises: at least one monitoring unit, each monitoring unit comprising a data acquisition board and a data processing board; the data acquisition board comprises a power supply bus and a plurality of power supply branch feeders electrically connected to the power supply bus; each power supply branch feeder is provided with an electromagnetic air switch, an on-board leakage current sensor, a first on-board current sensor and a voltage detection circuit; the on-board leakage current sensor is used to detect the branch leakage current on the power supply branch feeder; the first on-board current sensor is used to detect the branch current on the power supply branch feeder; the voltage detection circuit is used to detect the branch voltage of the power supply branch feeder; the data acquisition board is further provided with a second on-board current sensor, an alternating current intrusion detection circuit and a resistance control circuit, all of which are electrically connected to the power supply bus; the second on-board current sensor is used to detect the bus current on the power supply bus; the alternating current intrusion detection circuit is used to detect the alternating current intruding into the power supply bus, the bus voltage value and the ground voltage value of the bus; the resistance control circuit is used to control the resistance value between the bus and the ground; the data processing board is provided with a processor and a signal conditioning circuit; in the same monitoring unit: the processor is electrically connected to the signal conditioning circuit, and the signal conditioning circuit is electrically connected to the electromagnetic air switch, the on-board leakage current sensor, the first on-board current sensor, the voltage detection circuit, the second on-board current sensor, the alternating current intrusion detection circuit and the resistance control circuit on the data acquisition board; the signal conditioning circuit is used to obtain the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value, and transmit them to the processor; the processor is used to control the switching state of the electromagnetic air switch according to the branch leakage current, the branch current, the branch voltage, the bus current, the alternating current intruding into the power supply bus, the bus voltage value, the ground voltage value and the resistance value.

2. The power supply monitoring system according to claim 1, wherein: the processor is used to calculate the branch insulation resistance value of each branch, the branch power of each branch, the bus power and the bus insulation resistance value according to the branch leakage current, the branch current, the branch voltage, the bus current, the bus voltage value, the ground voltage value and the resistance value, and control the switching state of the electromagnetic air switch according to the branch insulation resistance value, the branch power, the branch current, the bus power, the bus insulation resistance value and the alternating current intruding into the power supply bus.

3. The power supply monitoring system according to claim 2, wherein: the processor is used to: When the branch insulation resistance exceeds a first set resistance value, the electromagnetic air switch on the power supply branch feeder is controlled to be turned off; When the busbar insulation resistance value exceeds a second set resistance value, or when AC power is injected into the power supply busbar, the electromagnetic air switches on all power supply branch feeders connected to the busbar are controlled to be turned off; When the branch power or the busbar power exceeds a set power value, an alarm is issued.

4. The power supply monitoring system according to claim 2, wherein: When the branch insulation resistance and the busbar insulation resistance both meet the requirements, and no AC power is injected into the power supply busbar, the processor compares each branch current with the current waveforms in the pre-stored fault and sub-health knowledge base under different power supply states, and determines the power supply state of the power supply branch feeder according to the comparison result.

5. The power supply monitoring system according to claim 4, wherein: When the branch current is consistent with the current waveform under the normal power supply state in the fault and sub-health knowledge base, the processor determines that the power supply branch feeder is working normally; when the branch current is consistent with the current waveform under the fault state in the fault and sub-health knowledge base, the processor determines that the power supply branch feeder has a fault, and controls the electromagnetic air switch on the power supply branch feeder to be turned off; when the branch current is consistent with the current waveform under the sub-health power supply state in the fault and sub-health knowledge base, the processor determines that the power supply branch is working in a sub-health state; and when the branch current is inconsistent with the current waveforms in the fault and sub-health knowledge base, the processor issues a reminder information to the staff.

6. The power supply monitoring system according to claim 5, wherein: After determining the power supply state, the processor reports to the monitoring platform.

7. The power supply monitoring system according to claim 1, wherein: The signal conditioning circuit includes an insulation resistance detection control circuit, an AC injection conditioning circuit, a busbar voltage conditioning circuit, a busbar current conditioning circuit, a branch current conditioning circuit, a branch voltage conditioning circuit, a branch leakage current conditioning circuit, and an analog-to-digital converter; The insulation resistance detection control circuit is electrically connected to the power supply resistance control circuit, the AC injection detection circuit, and the processor; the AC injection conditioning circuit is electrically connected to the AC injection detection circuit and the analog-to-digital converter; the busbar voltage conditioning circuit is electrically connected to the power supply resistance control circuit and the analog-to-digital converter; the busbar current conditioning circuit is electrically connected to the second on-board current sensor and the analog-to-digital converter; the branch current conditioning circuit is electrically connected to the first on-board current sensor and the analog-to-digital converter; the branch voltage conditioning circuit is electrically connected to the voltage detection circuit and the analog-to-digital converter; and the branch leakage current conditioning circuit is electrically connected to the on-board leakage current sensor and the analog-to-digital converter. ​ The insulation resistance detection control circuit is used to obtain the insulation resistance value of the positive and negative bus to the ground, and the AC intrusion detection circuit and the resistance control circuit are used to obtain the voltage value of the positive and negative bus to the ground when different resistance values are input, so as to solve the equation set to calculate the bus insulation resistance value, and the bus insulation resistance value is transmitted to the processor; The AC intrusion conditioning circuit is used to obtain the AC power, bus voltage value and ground voltage value of the power supply bus detected by the AC intrusion detection circuit, and transmit the AC power, bus voltage value and ground voltage value of the power supply bus to the analog-to-digital converter; The bus voltage conditioning circuit is used to obtain the resistance value detected by the resistance control circuit, and transmit the resistance value to the analog-to-digital converter; The bus current conditioning circuit is used to obtain the bus current detected by the second on-board current sensor, and transmit the bus current to the analog-to-digital converter; The branch current conditioning circuit is used to obtain the branch current detected by the first on-board current sensor, and transmit the branch current to the analog-to-digital converter; The branch voltage conditioning circuit is used to obtain the branch voltage detected by the voltage detection circuit, and transmit the branch voltage to the analog-to-digital converter; The branch leakage current conditioning circuit is used to obtain the branch leakage current detected by the on-board leakage current sensor, and transmit the branch leakage current to the analog-to-digital converter; The analog-to-digital converter and the processor are electrically connected; The analog-to-digital converter is used to convert the branch leakage current, branch current, branch voltage, bus current, AC power, bus voltage value, ground voltage value and resistance value into digital signals, and transmit them to the processor.

8. The power supply monitoring system according to claim 1, wherein: The data processing board further comprises a CAN communication interface, an RS485 communication interface and a short-range wireless module; When the power supply monitoring system comprises at least two monitoring units, the data processing boards of different monitoring units are connected in sequence through at least one of the CAN communication interface, the RS485 communication interface and the short-range wireless module; The processor of the data processing board of each monitoring unit is used to transmit the power supply data and the power supply state to the processor of the data processing board of the next level monitoring unit, and the processor of the data processing board of the last level monitoring unit is used to transmit the received power supply data and power supply state to the monitoring platform; the power supply data comprises the branch leakage current, the branch current, the branch voltage, the bus current, the AC power, the bus voltage value, the ground voltage value and the resistance value.

9. The power supply monitoring system according to claim 8, wherein: The data processing board further comprises an Ethernet communication interface and a 4G / 5G module; The processor of the data processing board of the last level monitoring unit is used to transmit the received power supply data and power supply state to the monitoring platform through at least one of the CAN communication interface, the RS485 communication interface, the Ethernet communication interface and the 4G / 5G module.

10. The power supply monitoring system of claim 1, wherein, including: The data acquisition board and the data processing board are connected through a power strip.

Images