A multi-channel current measurement system

Abstract

The embodiment of the present invention discloses a multi-channel current measurement system, which includes: multiple communication-connected subsystems, each of which includes an interface module, a communication module and multiple measurement modules, and the communication module and the measurement module are both electrically connected to the interface module; the interface module is used to receive an external input current; the measurement module is used to measure the current transmitted by the interface module, and transmit the measured current to the communication module through the interface module; the communication module is used to transmit the current measured by the measurement module to an external monitoring device that is communicatively connected to the multi-channel current measurement system, and the communication module adopts a multi-channel communication mode. The multi-channel current measurement system provided by the embodiment of the present invention can improve the measurement efficiency and the reliability of the measurement, and realize the real-time online monitoring of the current.

Description

Technical Field

[0001] The embodiments of the present invention relate to current measurement technology, and in particular to a multi-channel current measurement system. Background Art

[0002] In the process of measuring current, such as measuring the current signal output by the self-powered neutron detector in the core of a nuclear power plant, the measurement system measures the input current to use the measured current to characterize the neutron flux rate around the neutron detector, which is proportional to the reactor power. If the reliability of the current measurement is low, it may affect the measurement and control of the core based on the neutron flux rate. Therefore, it is necessary to measure the current accurately and reliably.

[0003] At present, the existing current measurement systems usually have fewer channels for transmitting current and less current data that can be measured simultaneously, which affects the measurement efficiency. Generally, they can only measure currents at the microampere level, which affects the reliability of current measurement. Summary of the invention

[0004] The embodiment of the present invention provides a multi-channel current measurement system to improve measurement efficiency and measurement reliability and realize real-time online monitoring of current.

[0005] The embodiment of the present invention provides a multi-channel current measurement system, comprising: a plurality of communication-connected subsystems, each of which comprises an interface module, a communication module and a plurality of measurement modules, and the communication module and the measurement module are both electrically connected to the interface module;

[0006] The interface module is used to receive external input current;

[0007] The measuring module is used to measure the current transmitted by the interface module, and transmit the measured current to the communication module through the interface module;

[0008] The communication module is used to transmit the current measured by the measurement module to an external monitoring device that is communicatively connected to the multi-channel current measurement system. The communication module adopts a multi-channel communication mode.

[0009] Optionally, the measurement module includes a signal conditioning circuit, an analog-to-digital conversion unit and a first processor, and the signal conditioning circuit is electrically connected to the first processor through the analog-to-digital conversion unit; the signal conditioning circuit is used to convert the input current signal into a voltage signal, and the first processor is used to process the voltage signal to obtain a corresponding current value, and store and output the current value.

[0010] Optionally, the signal conditioning circuit includes a capacitor, a first resistor, a second resistor and an operational amplifier, the negative input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the capacitor, the first resistor is connected in parallel with the capacitor, and the positive input terminal of the operational amplifier is grounded through the second resistor; the parameters of each component in the signal conditioning circuit are adjusted and determined based on the input current signal.

[0011] Optionally, the measurement module further includes a first communication interface and a first state indication unit, and the first communication interface and the first state indication unit are both electrically connected to the first processor;

[0012] The first processor is used to output the current value through the first communication interface, and is also used to generate a status indication signal according to the working status of the signal conditioning circuit and the working status of the analog-to-digital conversion unit, and send the status indication signal to the first status indication unit. The first status indication unit is used to issue status prompt information according to the status indication signal.

[0013] Optionally, the interface module includes a cable leakage detection circuit, a second communication interface and multiple signal interfaces, the interface module is electrically connected to the communication module through the second communication interface, and the cable leakage detection circuit is electrically connected to the measurement module through the signal interface; the measurement module is used to transmit the measured current to the communication module through the second communication interface, and the cable leakage detection circuit is used to detect whether the current input through the cable leaks in the cable.

[0014] Optionally, the cable leakage detection circuit includes a third resistor and a switch, the third resistor and the switch are connected in parallel, one end of the switch serves as the input end of the interface module, and the other end of the switch is electrically connected to the measurement module; the measurement module is also used to control the on and off of the switch.

[0015] Optionally, the interface module also includes an overvoltage protection circuit and a channel switch control circuit. The overvoltage protection circuit is electrically connected to the cable leakage detection circuit through the channel switch control circuit. The overvoltage protection circuit and the channel switch control circuit are both electrically connected to the measurement module. The measurement module is also used to control the working state of the interface module through the channel switch control circuit.

[0016] Optionally, the overvoltage protection circuit includes a first diode and a second diode, the channel switch control circuit includes a relay, the coil of the relay is electrically connected to the measurement module, the anode of the first diode is electrically connected to the anode of the second diode through a resistor, the anode of the first diode is also grounded through the normally open contact of the relay, the cathode of the first diode is electrically connected to the cathode of the second diode, the cathode of the first diode is also electrically connected to the measurement module, and the anode of the second diode is grounded through the normally open contact of the relay.

[0017] Optionally, the communication module includes a second processor, a third communication interface and a second status indication unit, and the third communication interface and the second status indication unit are both electrically connected to the second processor; the second processor is used to integrate and store the current measured by each measurement module, and transmit the current to an external monitoring device through the third communication interface.

[0018] Optionally, each subsystem communicates with each other through its own interface module, one subsystem among the multiple subsystems is a master subsystem, and the other subsystems are slave subsystems. The slave subsystem is used to transmit the current measured by itself to the master subsystem, and the master subsystem is used to transmit the current measured by itself and the current measured by the slave subsystem to an external monitoring device.

[0019] The multi-channel current measurement system provided by the embodiment of the present invention includes multiple communication-connected subsystems, each subsystem includes an interface module, a communication module and multiple measurement modules, the communication module and the measurement module are both electrically connected to the interface module, the current transmitted by the interface module is measured by the measurement module, and the measured current is transmitted to the communication module through the interface module, so that the communication module transmits the current measured by the measurement module to an external monitoring device that is communicatively connected to the multi-channel current measurement system. The multi-channel current measurement system provided by the embodiment of the present invention can simultaneously measure multiple external input currents through multiple measurement modules of multiple subsystems, thereby increasing the number of currents measured simultaneously, that is, improving the measurement efficiency, and the communication module adopts a multi-channel communication mode to prevent the signal transmission from being affected when a certain channel fails, thereby improving the reliability of the measurement, and the current measured by the measurement module can be transmitted to the external monitoring device through the communication module, realizing real-time online monitoring of the current. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural block diagram of a multi-channel current measurement system provided by Embodiment 1 of the present invention;

[0021] Figure 2 is a structural block diagram of a measurement module provided in Embodiment 2 of the present invention;

[0022] Figure 3 It is a structural diagram of the connection between an interface module and a measurement module provided by the second embodiment of the present invention;

[0023] Figure 4 is a structural block diagram of an interface module provided in Embodiment 3 of the present invention;

[0024] Figure 5 It is a structural block diagram of a communication module provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] Embodiment 1

[0027] Figure 1 It is a structural block diagram of a multi-channel current measurement system provided in Example 1 of the present invention. This embodiment can be applied to current measurement and other aspects, and can be applied to the output current measurement scenario of the self-sufficient neutron detector in the core of a nuclear power plant. The multi-channel current measurement system includes: multiple communication-connected subsystems 100, each subsystem 100 includes an interface module 10, a communication module 20 and multiple measurement modules 30, and the communication module 20 and the measurement module 30 are both electrically connected to the interface module 10.

[0028] Among them, the interface module 10 is used to receive external input current; the measurement module 30 is used to measure the current transmitted by the interface module 10, and transmit the measured current to the communication module 20 through the interface module; the communication module 20 is used to transmit the current measured by the measurement module 30 to an external monitoring device that is communicatively connected to the multi-channel current measurement system, and the communication module 20 adopts a multi-channel communication mode.

[0029] Specifically, when measuring the weak current (the weak current may be a current of microampere or nanoampere level) output by the self-powered neutron detector of the nuclear power plant core, the weak current output by the self-powered neutron detector is transmitted to the interface module 10 of the multi-channel current measurement system through a cable, and the interface module 10 receives the input current and transmits the current to the measurement module 30. The measurement module 30 measures the current transmitted by the interface module 10, such as performing signal conversion on the current, converting the current signal into a voltage signal, and the voltage signal at this time is an analog voltage signal. The measurement module 30 then converts the analog voltage signal into a digital voltage signal, and processes the digital voltage signal to obtain a corresponding current value, which is transmitted to an external monitoring device connected to the multi-channel current measurement system through the communication module 20 to realize real-time online monitoring of the current. The communication module 20 can adopt a multi-channel communication mode such as a two-way redundant communication mode, and when one of the channels fails, the other channel can be used to transmit electrical signals such as current, thereby improving the reliability of system communication. Figure 1In the example, a multi-channel current measurement system includes three subsystems, namely, subsystem 1, subsystem 2 and subsystem 3. Each subsystem includes one interface module, 10 measurement modules and two communication modules. The interface module can transmit signals to the measurement module through the signal interface set by itself. The interface module can set 10 signal interfaces corresponding to the 10 measurement modules to transmit signals. If each signal interface can transmit 10 signals and one measurement module can measure 10 current signals at the same time, each subsystem can realize real-time measurement of 100 current signals at the same time, that is, the multi-channel current measurement system can realize real-time measurement of 300 current signals at the same time, thereby increasing the number of currents measured simultaneously; and one of the two communication modules can be in working state and the other as a standby. When the communication module in working state fails, the standby communication module can be put into operation to prevent the signal transmission from being affected by the communication module failure, thereby improving the reliability of the system.

[0030] It should be noted that Figure 1 The number of measurement modules is only for illustrative purposes, and the specific number can be set according to actual conditions and is not limited here.

[0031] The multi-channel current measurement system provided in this embodiment can simultaneously measure multiple external input currents through multiple measurement modules of multiple subsystems, thereby increasing the number of currents measured simultaneously, that is, improving the measurement efficiency. The communication module adopts a multi-channel communication mode to prevent the signal transmission from being affected when a certain channel fails, thereby improving the measurement reliability. The current measured by the measurement module can be transmitted to an external monitoring device through the communication module, thereby realizing real-time online monitoring of the current.

[0032] Embodiment 2

[0033] Figure 2 It is a structural block diagram of a measurement module provided in Embodiment 2 of the present invention. Based on Embodiment 1, optionally, the measurement module includes a signal conditioning circuit 31, an analog-to-digital conversion unit 32 and a first processor 33, and the signal conditioning circuit 31 is electrically connected to the first processor 33 through the analog-to-digital conversion unit 32; the signal conditioning circuit 31 is used to convert the input current signal into a voltage signal, and the first processor 33 is used to process the voltage signal to obtain a corresponding current value, and store and output the current value.

[0034] Among them, the voltage signal converted by the signal conditioning circuit 31 is an analog voltage signal, and the analog-to-digital conversion unit 32 may include an A / D converter. The A / D converter converts the analog voltage signal into a digital voltage signal and transmits the digital voltage signal to the first processor 33. The first processor 33 processes the digital voltage signal to obtain a corresponding current value, thereby realizing the measurement of the external input current. The first processor 33 can store the current value so as to call the measured current value at any time.

[0035] Figure 3 It is a structural diagram of the connection between an interface module and a measurement module provided in Embodiment 2 of the present invention. Optionally, the signal conditioning circuit 31 includes a capacitor C, a first resistor R1, a second resistor R2 and an operational amplifier Q. The negative input terminal of the operational amplifier Q is electrically connected to the output terminal of the operational amplifier Q through the capacitor C. The first resistor R1 is connected in parallel with the capacitor C. The positive input terminal of the operational amplifier Q is grounded through the second resistor R2. The parameters of each component in the signal conditioning circuit are adjusted and determined based on the input current signal.

[0036] Specifically, the signal conditioning circuit 31 amplifies the current signal and linearly converts it into a voltage signal through the operational amplifier Q and the components electrically connected to the operational amplifier Q. The relationship between the input current I and the output voltage V of the operational amplifier Q is: V=-I*R1. The parameters of each component can be adjusted and determined based on the input current signal. For example, the first resistor R1 is determined to be 499 ohms, the capacitor C is 510pF, the second resistor R2 is 0 ohms, the open-loop DC gain of the operational amplifier Q is 120dB, the offset voltage is ±26uV, the temperature drift is -1.5uV / ℃, and the common mode rejection ratio is 100dB. The component parameters are adjusted and determined based on the input current signal to ensure that the measurement circuit under the determined component parameters can measure the external input current more accurately, thereby improving the measurement accuracy.

[0037] in addition, Figure 3 Taking 8 signal conditioning circuits in the measurement module as an example, each measurement module in the multi-channel current system can measure 8 current signals simultaneously. Each signal conditioning circuit has other electrically connected circuits. The number of signal conditioning circuits in the measurement module can be set according to actual conditions and is not limited here.

[0038] refer to Figure 2 Optionally, the measurement module 30 also includes a first communication interface 34 and a first state indication unit 35, both of which are electrically connected to the first processor 33; the first processor 33 is used to output the current value through the first communication interface 34, and is also used to generate a state indication signal according to the working state of the signal conditioning circuit 31 and the working state of the analog-to-digital conversion unit 32, and send the state indication signal to the first state indication unit 35, and the first state indication unit 35 is used to issue a state prompt information according to the state indication signal.

[0039] Specifically, the first processor 33 can transmit the current value to the communication module through the first communication interface 34 to realize the transmission of the current value. The first processor 33 can detect the working status of the signal conditioning circuit 31 and the working status of the analog-to-digital conversion unit 32, and generate a status indication signal according to the working status of the signal conditioning circuit 31 and the working status of the analog-to-digital conversion unit 32. For example, when the signal conditioning circuit 31 fails and does not work and / or the analog-to-digital conversion unit 32 fails and does not work, that is, no signal is transmitted to the first processor 33, the first processor 33 can generate a fault status indication signal and send the fault status indication signal to the first status indication unit 35. The first status indication unit 35 sends a status prompt information according to the fault status indication signal, such as the indicator light of the first status indication unit 35 is on, to prompt that the signal conditioning circuit 31 and / or the analog-to-digital conversion unit 32 are faulty, so as to facilitate relevant personnel to timely understand the working status of the measurement module 30 and take corresponding measures when the measurement module 30 fails.

[0040] The multi-channel current measurement system provided in this embodiment converts the input current signal into a voltage signal through a signal conditioning circuit, and the first processor processes the voltage signal to obtain a corresponding current value, and stores and outputs the current value, so that the communication module transmits the current measured by the measurement module to an external monitoring device that is connected to the multi-channel current measurement system. The multi-channel current measurement system provided in this embodiment can simultaneously measure multiple external input currents through multiple measurement modules of multiple subsystems, thereby increasing the number of currents measured simultaneously, that is, improving the measurement efficiency, and the communication module adopts a multi-channel communication mode to prevent the signal transmission from being affected when a certain channel fails, thereby improving the reliability of the measurement, and the current measured by the measurement module can be transmitted to the external monitoring device through the communication module to realize real-time online monitoring of the current; and the first status indication unit can send a status prompt information according to the status indication signal, so that the relevant staff can timely understand the working status of the measurement module and take corresponding measures when the measurement module fails.

[0041] Embodiment 3

[0042] Figure 4 It is a structural block diagram of an interface module provided in Embodiment 3 of the present invention. Based on Embodiment 1, optionally, the interface module 10 includes a cable leakage detection circuit 11, a second communication interface 12 and a plurality of signal interfaces 13, the interface module 10 is electrically connected to the communication module 20 through the second communication interface 12, and the cable leakage detection circuit 11 is electrically connected to the measurement module 30 through the signal interface 13; the measurement module 30 is used to transmit the measured current to the communication module 20 through the second communication interface 12, and the cable leakage detection circuit 11 is used to detect whether the current input through the cable is leaking in the cable.

[0043] Among them, the external input current can be transmitted to the interface module 10 through the cable, and the number of the signal interface 13 can correspond to the number of the measurement module 30, that is, the interface module 10 transmits the current signal to the measurement module 30 through the signal interface 13 corresponding to the measurement module 30, and the measurement module 30 transmits the measured current to the communication module 20 through the second communication interface 12 to realize the current transmission. When the cable leakage detection circuit 11 and the measurement module 30 have signal transmission, the measurement module 30 can detect whether the current input through the cable is leaking in the cable by controlling the cable leakage detection circuit 11, so as to realize the insulation performance detection of the current access cable.

[0044] Combination Figure 3 and Figure 4 Optionally, the cable leakage detection circuit 11 includes a third resistor R3 and a switch K, the third resistor R3 and the switch K are connected in parallel, one end of the switch K serves as the input end of the interface module 10, and the other end of the switch K is electrically connected to the measurement module 30; the measurement module 30 is also used to control the on and off of the switch K.

[0045] Specifically, the first processor in the measurement module 30 can control the on and off of the switch K. When the first processor controls the switch K to be closed, the third resistor R3 is short-circuited, and the current input through the cable is transmitted to the first processor through the closed switch K; when the first processor controls the switch K to be disconnected, the current input through the cable is transmitted to the first processor through the third resistor R3. The signal sizes transmitted to the first processor when the switch K is closed and disconnected are different. The first processor can store the difference in signal sizes when the cable insulation performance is good and the current is transmitted to the first processor through the above two different paths. The first processor can determine whether the current corresponding to the currently received signal is leaked in the cable according to the stored corresponding information. If the difference in signal sizes currently received through the above two different paths is different from the difference in stored signal sizes, it can be determined that the current is leaking in the cable, indicating that the insulation performance of the cable is damaged, and the first processor can generate a corresponding prompt signal and transmit the prompt signal to the communication module 20, so as to transmit the prompt signal to the external monitoring device through the communication module 20, so as to facilitate the relevant staff to understand the insulation performance of the cable through the prompt signal received by the external monitoring device, and take corresponding measures in time when the insulation performance of the cable is damaged, that is, when there is current leakage.

[0046] Optionally, the interface module 10 also includes an overvoltage protection circuit 14 and a channel switch control circuit 15. The overvoltage protection circuit 14 is electrically connected to the cable leakage detection circuit 11 through the channel switch control circuit 15. The overvoltage protection circuit 14 and the channel switch control circuit 15 are both electrically connected to the measurement module 30. The measurement module 30 is also used to control the working state of the interface module 10 through the channel switch control circuit 15.

[0047] Specifically, when the voltage across the overvoltage protection circuit 14 is too large, the overvoltage protection circuit 14 can clamp the voltage across the overvoltage protection circuit 14 to prevent the circuit connected to it from being over-voltage and damaging the circuit components and affecting the normal operation of the circuit. The current in the channel switch control circuit 15 can be transmitted to the measurement module 30 through the cable leakage detection circuit 11. The measurement module 30 can control the on and off of the channel switch control circuit 15, thereby controlling whether the interface module 10 receives the external input current. When the current needs to be detected, the external monitoring device can send an instruction to the measurement module 30 through the communication module 20. The measurement module 30 controls the channel switch control circuit 15 to be turned on according to the instruction to measure the external input current.

[0048] Optionally, the overvoltage protection circuit 14 includes a first diode D1 and a second diode D2, and the channel switch control circuit 15 includes a relay T, the coil of the relay T is electrically connected to the measurement module 30, the anode of the first diode D1 is electrically connected to the anode of the second diode D2 through a resistor, the anode of the first diode D1 is also grounded through the normally open contact of the relay T, the cathode of the first diode D1 is electrically connected to the cathode of the second diode D2, the cathode of the first diode D1 is also electrically connected to the measurement module 30, and the anode of the second diode D2 is grounded through the normally open contact of the relay T.

[0049] The voltage flowing through the first diode D1 and the second diode D2 can be transmitted to the first processor, and the overvoltage protection circuit 14 can clamp the voltage in the circuit through the first diode D1 and the second diode D2 to achieve overvoltage protection. The first processor in the measurement module 30 can control the coil of the relay T to be energized or de-energized, thereby controlling the switching state of the normally open contact of the relay T. When the first processor controls the coil of the relay T to be energized, the normally open contact of the relay T is closed, and the external input current is transmitted to the cable leakage detection circuit 11 through the normally open contact of the relay T, thereby controlling the on-off state of the channel switch control circuit 15 through the first processor to achieve control of current transmission.

[0050] The multi-channel current measurement system provided in this embodiment can measure multiple external input currents simultaneously through multiple measurement modules of multiple subsystems, thereby increasing the number of currents measured simultaneously, that is, improving the measurement efficiency. The communication module adopts a multi-channel communication mode to prevent the influence of signal transmission when a certain channel fails, thereby improving the reliability of measurement. The current measured by the measurement module can be transmitted to an external monitoring device through the communication module to realize real-time online monitoring of the current; and the cable detection circuit detects whether the current input through the cable is leaking in the cable, thereby realizing the insulation performance detection of the current access cable. The overvoltage protection circuit can realize overvoltage protection of the circuit. The on-off state of the channel switch control circuit is controlled by the first processor to realize the control of current transmission.

[0051] Embodiment 4

[0052] Figure 5 It is a structural block diagram of a communication module provided in Embodiment 4 of the present invention. Based on Embodiment 1, optionally, the communication module 20 includes a second processor 21, a third communication interface 22, and a second state indication unit 23, and the third communication interface 22 and the second state indication unit 23 are both electrically connected to the second processor 21; the second processor 21 is used to integrate and store the current measured by each measurement module 30, and transmit the current to the external monitoring device 40 through the third communication interface 22.

[0053] Among them, the second processor 21 can transmit the current measured by each measurement module 30 to the external monitoring device 40 through the third communication interface 22, so as to realize the real-time monitoring of the current by the external monitoring device 40, and the second processor 21 can uniformly store the current measured by each measurement module 30, so as to facilitate the current retrieval at any time. The second processor 21 can detect the working state of the third communication interface 22. For example, when the second processor 21 detects that the third communication interface 22 fails and cannot transmit current, it generates an interface fault signal and sends the interface fault signal to the second state indication unit 23. The second state indication unit 23 sends a prompt message according to the received interface fault signal, such as the indicator light of the second state indication unit 23 is on, indicating that the third communication interface 22 fails, so as to prompt the relevant staff to take timely measures.

[0054] In addition, the communication module 20 may further include a human-machine interface and an Ethernet interface. The communication module 20 may also transmit the current to the local terminal device through the human-machine interface and transmit the current to the external monitoring device 40 through the Ethernet interface.

[0055] refer to Figure 1 Optionally, each subsystem communicates with each other through its own interface module. One of the multiple subsystems is a master subsystem, and the other subsystems are slave subsystems. The slave subsystem is used to transmit the current measured by itself to the master subsystem, and the master subsystem is used to transmit the current measured by itself and the current measured by the slave subsystem to an external monitoring device.

[0056] Specifically, Figure 1 As an example, subsystem 1, subsystem 2 and subsystem 3 communicate through their respective interface modules 10. Figure 1 Subsystem 1 is used as the master subsystem, and subsystems 2 and 3 are used as slave subsystems. Subsystems 2 and 3 transmit their own measured currents to the interface module 10 of subsystem 1 through their respective interface modules 10, and subsystem 1 transmits its own measured current and the currents measured by subsystems 2 and 3 to the external monitoring device through the communication module 20, thereby realizing the unified output of current in the multi-channel current measurement system.

[0057] The multi-channel current measurement system provided in this embodiment can measure multiple external input currents simultaneously through multiple measurement modules of multiple subsystems, thereby increasing the number of currents measured simultaneously, that is, improving the measurement efficiency. The communication module adopts a multi-channel communication mode to prevent the influence of signal transmission when a certain channel fails, thereby improving the reliability of measurement. The current measured by the measurement module can be transmitted to an external monitoring device through the communication module to realize real-time online monitoring of the current; and when the third communication interface fails, a corresponding prompt message is issued through the second status indication unit to prompt relevant staff to take measures in time, and the current measured by itself and the current measured by the slave subsystem are transmitted to the external monitoring device through the main subsystem, thereby realizing the unified output of the current in the multi-channel current measurement system.

[0058] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-channel current measurement system, characterized in that: include: A plurality of communication-connected subsystems, each of which comprises an interface module, a communication module and a plurality of measurement modules, wherein the communication module and the measurement module are both electrically connected to the interface module; wherein the communication module comprises a human-machine interface and an Ethernet interface; The interface module is used to receive external input current; The measuring module is used to measure the current transmitted by the interface module, and transmit the measured current to the communication module through the interface module; The communication module is used to transmit the current measured by the measurement module to an external monitoring device that is communicatively connected to the multi-channel current measurement system, and the communication module adopts a multi-channel communication mode; The interface module includes a cable leakage detection circuit, a second communication interface and multiple signal interfaces. The interface module is electrically connected to the communication module through the second communication interface, and the cable leakage detection circuit is electrically connected to the measurement module through the signal interface; the measurement module is used to transmit the measured current to the communication module through the second communication interface, and the cable leakage detection circuit is used to detect whether the current input through the cable leaks in the cable.

2. The multi-channel current measurement system according to claim 1, characterized in that: The measurement module includes a signal conditioning circuit, an analog-to-digital conversion unit and a first processor. The signal conditioning circuit is electrically connected to the first processor through the analog-to-digital conversion unit. The signal conditioning circuit is used to convert the input current signal into a voltage signal. The first processor is used to process the voltage signal to obtain a corresponding current value, and store and output the current value.

3. The multi-channel current measurement system according to claim 2, characterized in that: The signal conditioning circuit includes a capacitor, a first resistor, a second resistor and an operational amplifier, the negative input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the capacitor, the first resistor is connected in parallel with the capacitor, and the positive input terminal of the operational amplifier is grounded through the second resistor; the parameters of each component in the signal conditioning circuit are adjusted and determined based on the input current signal.

4. The multi-channel current measurement system according to claim 2, characterized in that: The measurement module further includes a first communication interface and a first state indication unit, wherein the first communication interface and the first state indication unit are both electrically connected to the first processor; The first processor is used to output the current value through the first communication interface, and is also used to generate a status indication signal according to the working status of the signal conditioning circuit and the working status of the analog-to-digital conversion unit, and send the status indication signal to the first status indication unit, and the first status indication unit is used to issue status prompt information according to the status indication signal.

5. The multi-channel current measurement system according to claim 1, characterized in that: The cable leakage detection circuit includes a third resistor and a switch, the third resistor and the switch are connected in parallel, one end of the switch serves as the input end of the interface module, and the other end of the switch is electrically connected to the measurement module; the measurement module is also used to control the on and off of the switch.

6. The multi-channel current measurement system according to claim 1, characterized in that: The interface module also includes an overvoltage protection circuit and a channel switch control circuit. The overvoltage protection circuit is electrically connected to the cable leakage detection circuit through the channel switch control circuit. The overvoltage protection circuit and the channel switch control circuit are both electrically connected to the measurement module. The measurement module is also used to control the working state of the interface module through the channel switch control circuit.

7. The multi-channel current measurement system according to claim 6, characterized in that: The overvoltage protection circuit includes a first diode and a second diode, and the channel switch control circuit includes a relay, the coil of the relay is electrically connected to the measurement module, the anode of the first diode is electrically connected to the anode of the second diode through a resistor, the anode of the first diode is also grounded through a normally open contact of the relay, the cathode of the first diode is electrically connected to the cathode of the second diode, the cathode of the first diode is also electrically connected to the measurement module, and the anode of the second diode is grounded through the normally open contact of the relay.

8. The multi-channel current measurement system according to claim 1, characterized in that: The communication module includes a second processor, a third communication interface and a second state indication unit, and the third communication interface and the second state indication unit are both electrically connected to the second processor; The second processor is used to integrate and store the currents measured by each measurement module, and transmit the currents to the external monitoring device through the third communication interface.

9. The multi-channel current measurement system according to claim 1, characterized in that: Each subsystem communicates with each other through its own interface module. One subsystem among the multiple subsystems is a master subsystem, and the other subsystems are slave subsystems. The slave subsystem is used to transmit the current measured by itself to the master subsystem, and the master subsystem is used to transmit the current measured by itself and the current measured by the slave subsystem to the external monitoring device.

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