CN216979169U - Grounding current monitoring device and system - Google Patents
Grounding current monitoring device and system Download PDFInfo
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- CN216979169U CN216979169U CN202220295499.3U CN202220295499U CN216979169U CN 216979169 U CN216979169 U CN 216979169U CN 202220295499 U CN202220295499 U CN 202220295499U CN 216979169 U CN216979169 U CN 216979169U
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Abstract
The embodiment of the utility model discloses a grounding current monitoring device and a grounding current monitoring system. The grounding current monitoring device comprises a signal processing module, a signal conversion module, a control module and a display module; the first end of the signal processing module is connected with a grounding wire of the equipment to be monitored, the second end of the signal processing module is connected with the first end of the signal conversion module, the second end of the signal conversion module is connected with the first end of the control module, and the second end of the control module is connected with the display module; the signal processing module is used for amplifying the inflow analog quantity grounding current; the signal conversion module is used for collecting analog quantity grounding current and converting the analog quantity grounding current into digital quantity grounding current; the control module is used for calculating an effective value of the analog quantity grounding current according to the digital quantity grounding current; the display module is used for displaying the effective value of the analog quantity grounding current. This scheme is convenient for staff real-time detection to wait the accurate effective value of monitoring facilities's earth connection electric current.
Description
Technical Field
The embodiment of the utility model relates to the technical field of power electronics, in particular to a grounding current monitoring device and system.
Background
When the iron core of the power transformer is grounded at two points or multiple points, circulation current can be generated inside the iron core of the transformer, so that the iron core of the transformer is locally overheated, and even the iron core is locally burnt. Once the grounding piece of the transformer is fused, the potential of the transformer core can be suspended, and the discharge fault is generated, so that the safe operation of the transformer is seriously threatened. Therefore, monitoring the grounding current of the transformer core is important in the operation process of the transformer.
At present, a tester usually adopts a handheld clamp-on ammeter to measure the grounding current of a transformer core, but the handheld clamp-on ammeter is easily interfered by a power frequency magnetic field, so that the precision of the grounding current of the measured transformer core is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a grounding current monitoring device and a grounding current monitoring system, which can conveniently and quickly measure the grounding current of a transformer iron core and improve the accuracy of the grounding current measurement of the transformer iron core.
In a first aspect, an embodiment of the present invention provides a ground current monitoring device, which includes a signal processing module, a signal conversion module, a control module, and a display module;
the first end of the signal processing module is connected with a grounding wire of the equipment to be monitored, the second end of the signal processing module is connected with the first end of the signal conversion module, the second end of the signal conversion module is connected with the first end of the control module, and the second end of the control module is connected with the display module;
the signal processing module is used for amplifying the inflow analog quantity grounding current; the signal conversion module is used for collecting analog quantity grounding current and converting the analog quantity grounding current into digital quantity grounding current; the control module is used for calculating an effective value of the analog quantity grounding current according to the digital quantity grounding current; the display module is used for displaying the effective value of the analog quantity grounding current.
Optionally, the signal processing module comprises an amplifying unit;
the first end of the amplifying unit is connected with the grounding wire of the device to be monitored, and the second end of the amplifying unit is connected with the first end of the signal conversion module; the amplifying unit is used for amplifying the inflow analog quantity grounding current.
Optionally, the amplifying unit comprises an amplifier and a first voltage regulator;
the input end of the amplifier is used as the first end of the amplifying unit, the output end of the amplifier is used as the second end of the amplifying unit, and the output end of the first voltage stabilizer is connected with the power supply end of the amplifier;
the first voltage stabilizer is used for providing stable voltage for the amplifier, and the amplifier is used for amplifying the analog quantity grounding current flowing in.
Optionally, the signal processing module further includes a filtering unit;
the first end of the filtering unit is used as the first end of the signal processing module, and the second end of the filtering unit is connected with the first end of the amplifying unit; the filtering unit is used for filtering noise waves doped in the inflow analog quantity grounding current.
Optionally, the ground current monitoring device further comprises a communication module, the communication module is connected with the control module, and the communication module is used for sending the effective value of the analog ground current to the remote monitoring device.
Optionally, the ground current monitoring device further comprises a power supply module;
the output end of the power supply module is respectively connected with the signal processing module, the signal conversion module, the control module, the display module and the communication module, and the power supply module is used for supplying power to the signal processing module, the signal conversion module, the control module, the display module and the communication module.
Optionally, the power supply module comprises a switching power supply and a second voltage regulator;
the output end of the second voltage stabilizer is used as the output end of the power supply module, and the switching power supply is connected with the input end of the second voltage stabilizer; the conversion power supply is used for outputting voltage, and the second voltage stabilizer is used for providing stable voltage for the signal processing module, the signal conversion module, the control module, the display module and the communication module.
Optionally, the control module comprises a single chip microcomputer; the signal conversion module comprises an analog-to-digital converter;
the model of the singlechip is CH563, and the model of the analog-to-digital converter is AD7616 BSTZ.
In a second aspect, an embodiment of the present invention further provides a ground current monitoring system, which includes the ground current monitoring apparatus in any one of the above embodiments, a device to be monitored, and a remote monitoring device;
the grounding current monitoring device is connected with a grounding wire of the equipment to be monitored, and is in remote communication with the remote monitoring equipment; the ground current monitoring device is used for detecting the effective value of the analog quantity ground current flowing out of the ground wire, and the remote monitoring equipment is used for displaying the effective value of the analog quantity ground current flowing out of the ground wire of the equipment to be monitored.
Optionally, the device to be monitored comprises a power transformer.
The embodiment of the utility model amplifies the inflow analog quantity grounding current through the signal processing module, retains the characteristic of the original analog quantity grounding current, and is convenient for a subsequent circuit to accurately process the inflow analog quantity grounding current. The signal conversion module collects the analog quantity ground current, and the accuracy of the analog quantity ground current collected by the signal conversion module can be ensured. The signal conversion module converts the analog quantity grounding current into the digital quantity grounding current, so that the anti-interference performance of the grounding current in the transmission and processing of a subsequent circuit can be enhanced. Therefore, the control module can obtain the effective value of the analog quantity grounding current with higher accuracy according to the digital quantity grounding current calculation. The display module displays the effective value of the analog quantity grounding current, so that a worker can know the effective value of the grounding line current of the equipment to be monitored in real time.
Drawings
Fig. 1 is a schematic structural diagram of a handheld clamp ammeter provided in the prior art;
fig. 2 is a schematic structural diagram of a ground current monitoring device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an amplifying unit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a power module according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a ground current monitoring system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a handheld clamp ammeter provided in the prior art. As shown in fig. 1, the handheld clamp ammeter comprises a current collecting module 110, a rectifying module 120, a digital-to-analog converting module 130 and a display screen 140. The first end of the current collection module 110 is connected to a ground line of the device to be monitored, for example, the clamp head of the current collection module 110 clamps the ground line of the device to be monitored, so that the current collection module 110 can collect the current on the ground line of the device to be monitored and convert the collected current into an instantaneous value signal of millivolt ac or milliamp ac. The second end of the current collection module 110 is connected to the first end of the rectification module 120, the current collection module 110 may transmit the converted instantaneous value signal of the alternating millivolt or the alternating milliampere to the rectification module 120, and the rectification module 120 may process the instantaneous value signal of the alternating millivolt or the alternating milliampere into an instantaneous value signal of the direct millivolt or the direct milliampere. The second end of the rectifying module 120 is connected to the first end of the digital-to-analog conversion module 130, and since the instantaneous value signal of the direct-current millivolt or the direct-current milliamp is an analog signal, the digital-to-analog conversion module 130 can convert the instantaneous value signal of the direct-current millivolt or the direct-current milliamp transmitted by the rectifying module 120 into a digital instantaneous value signal of the direct-current millivolt or the direct-current milliamp. The second end of the digital-to-analog conversion module 130 is connected to the display screen 140, and the digital conversion module can send a digital direct millivolt or direct milliamp instantaneous value signal (an effective value of a transformer core grounding current) to a display unit (an LED nixie tube or a liquid crystal display screen) for displaying.
When the existing rectification module 120 rectifies the received ac millivolt or ac milliamp instantaneous value signal, it is affected by the accuracy of its internal analog circuit electronic components, so that the rectified dc millivolt or dc milliamp instantaneous value signal has a large deviation from the real effective value of the transformer core ground current, resulting in a low measured ground current accuracy of the transformer core.
The embodiment of the utility model provides a grounding current monitoring device, and fig. 2 is a schematic structural diagram of the grounding current monitoring device provided by the embodiment of the utility model. As shown in fig. 2, the ground current monitoring apparatus includes a signal processing module 210, a signal conversion module 220, a control module 230, and a display module 240; a first end of the signal processing module 210 is connected to a ground line of the device to be monitored, a second end of the signal processing module 210 is connected to a first end of the signal conversion module 220, a second end of the signal conversion module 220 is connected to a first end of the control module 230, and a second end of the control module 230 is connected to the display module 240; the signal processing module 210 is used for amplifying the incoming analog quantity ground current; the signal conversion module 220 is configured to collect an analog ground current and convert the analog ground current into a digital ground current; the control module 230 is used for calculating an effective value of the analog quantity ground current according to the digital quantity ground current; the display 240 module is used for displaying the effective value of the analog quantity ground current.
The signal processing module 210 may amplify the incoming analog ground current, and retains the characteristics of the original analog ground current, so that the subsequent circuit can accurately process the incoming analog ground current. The signal conversion module 220 can collect the amplified analog ground current, and can ensure the accuracy of the analog ground current collected by the signal conversion module 220. The signal conversion module 220 correspondingly converts the analog quantity ground current into the digital quantity ground current while collecting the analog quantity ground current, so that the anti-interference performance of the ground current in the transmission and processing of a subsequent circuit can be enhanced, and the accuracy of the subsequent circuit for calculating the effective value of the analog quantity ground current is improved. The control module 230 may calculate the effective value of the analog ground current according to the digital ground current, and since the digital ground current is obtained by digital quantization according to the amplified original analog ground current, the control module 230 has high accuracy of calculating the effective value of the analog ground current according to the digital ground current. The display module 240 can display the effective value of the analog ground current, so that the worker can know the magnitude of the ground line current of the device to be monitored in real time, and thus, whether the device to be monitored has a ground fault or not is judged.
Specifically, a first end of the signal processing module 210 is connected to a ground line of the device to be monitored, and the signal processing module 210 may obtain an analog ground current through the ground line of the device to be monitored and amplify the obtained analog ground current. The second end of the signal processing module 210 is connected to the first end of the signal conversion module 220, the signal processing module 210 can transmit the amplified analog ground current to the signal conversion module 220, and the signal conversion module 220 can collect the analog ground current within a preset time according to the periodicity of the analog ground current and convert the collected analog ground current into digital ground current, so that the accuracy of the collected current data can be guaranteed, and the anti-interference performance of the output current data can be improved. The second end of the signal conversion module 220 is connected to the first end of the control module 230, and after the control module 230 receives all the digital ground currents transmitted from the signal conversion module 220, the control module can calculate the effective value of the high-precision analog ground current according to all the received digital ground currents. The second end of the control module 230 is connected to the display module 240, and the control module 230 can output the effective value of the analog ground current to the display module 240 for display, so as to facilitate the real-time viewing of the staff.
The embodiment of the utility model amplifies the inflow analog quantity grounding current through the signal processing module, retains the characteristic of the original analog quantity grounding current, and is convenient for a subsequent circuit to accurately process the inflow analog quantity grounding current. The signal conversion module collects the analog quantity ground current, and the accuracy of the analog quantity ground current collected by the signal conversion module can be ensured. The signal conversion module converts the analog quantity grounding current into the digital quantity grounding current, so that the anti-interference performance of the grounding current in the transmission and processing of a subsequent circuit can be enhanced. Therefore, the control module can obtain the effective value of the analog quantity grounding current with higher accuracy according to the digital quantity grounding current calculation. The display module displays the effective value of the analog quantity grounding current, so that a worker can know the effective value of the grounding line current of the equipment to be monitored in real time.
Fig. 3 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 3, the signal processing module 210 includes an amplifying unit 211; a first end of the amplifying unit 211 is connected to a ground line of the device to be monitored, and a second end of the amplifying unit 211 is connected to a first end of the signal conversion module 220; the amplifying unit 211 is used to amplify the incoming analog ground current.
The first end of the amplifying unit 211 is connected to a ground line of the device to be monitored, and the amplifying unit 211 may obtain the analog ground current through the ground line of the device to be monitored, and amplify the obtained analog ground current. The second end of the amplifying unit 211 is connected to the first end of the signal converting module 220, and the amplifying unit 211 may transmit the amplified analog ground current to the signal converting module 220. When the amplifying unit 211 amplifies the analog ground current flowing in, the characteristics of the original analog ground current are retained, and the accuracy of the analog ground current flowing in the subsequent circuit is ensured.
Fig. 4 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 4, the amplifying unit includes an amplifier 2111 and a first regulator 2112; an input end of the amplifier 2111 serves as a first end of the amplifying unit, an output end of the amplifier 2111 serves as a second end of the amplifying unit, and an output end of the first regulator 2112 is connected with a power supply end of the amplifier 2111; the first regulator 2112 is used to supply a stable voltage to the amplifier 2111, and the amplifier 2111 is used to amplify an analog ground current flowing thereinto.
The input end of the amplifier 2111 serves as the first end of the amplifying unit, that is, the input end of the amplifier 2111 is connected to the ground line of the device to be monitored, and the amplifier 2111 may obtain the analog ground current through the ground line of the device to be monitored and amplify the obtained analog ground current. The output end of the amplifier 2111 serves as the second end of the amplifying unit, that is, the output end of the amplifier 2111 is connected to the first end of the signal converting module 220, and the amplifier 2111 can transmit the amplified analog ground current to the signal converting module 220. When the amplifier 2111 amplifies the inflow analog quantity grounding current, the characteristics of the original analog quantity grounding current can be kept, and the accuracy of the analog quantity grounding current flowing into a subsequent circuit is ensured. The output terminal of the first regulator 2112 is connected to the power supply terminal of the amplifier 2111, and the first regulator 2112 can supply a stable voltage to the amplifier 2111 to ensure normal and stable operation of the amplifier 2111.
Fig. 5 is a schematic circuit diagram of an amplifying unit according to an embodiment of the present invention. As shown in fig. 5, the amplification unit includes an amplifier 2111 of type ADA4522 and a first regulator 2112 of type LT 3032. The amplifier 2111 with the model of ADA4522 has the characteristics of zero drift, low noise, low power consumption, interference resistance and the like, and can accurately amplify analog grounding current. The first regulator 2112 with the model number LT3032 has a wide input voltage range from +/-2.3V to +/-20V, can provide an adjustable output voltage from +/-1.22V to +/-20V, adopts a very small and low-cost ceramic output capacitor, has the characteristics of high stability and transient response, and can provide a stable voltage matched with the amplifier 2111.
Fig. 6 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 6, the signal processing module 210 further includes a filtering unit 212; a first end of the filtering unit 212 is used as a first end of the signal processing module 210, and a second end of the filtering unit 212 is connected with a first end of the amplifying unit; the filtering unit 212 is used for filtering noise doped in the incoming analog ground current.
The first end of the filtering unit 212 serves as the first end of the signal processing module 210, that is, the first end of the filtering unit 212 is connected to the ground line of the device to be monitored, and the filtering unit 212 may obtain the analog ground current through the ground line of the device to be monitored and filter the obtained analog ground current to filter noise waves doped in the analog ground current flowing in, thereby further improving the accuracy of the analog ground current input to a subsequent circuit. The second terminal of the filtering unit 212 is connected to the first terminal of the amplifying unit, so that the amplifying unit can amplify the analog ground current with the noise filtered.
Fig. 7 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 7, the ground current monitoring apparatus further includes a communication module 250, the communication module 250 is connected to the control module 230, and the communication module 250 is configured to send the effective value of the analog ground current to the remote monitoring device.
The communication module 250 is connected to the control module 230, the control module 230 can transmit the calculated effective value of the high-precision analog quantity ground current to the communication module 250, and the communication module 250 can transmit the data to the remote monitoring device in communication connection with the communication module after receiving the effective value of the high-precision analog quantity ground current. Therefore, the communication module 250 is a bridge for information communication between the control module 230 and the remote monitoring device, so that the effective value of the analog ground current can be displayed on the remote monitoring device, and monitoring personnel can know the magnitude of the ground wire current of the device to be monitored in real time conveniently.
Fig. 8 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 8, the ground current monitoring device further includes a power module 260; the output end of the power module 260 is connected to the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250, respectively, and the power module 260 is configured to supply power to the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250.
The power module 260 includes a plurality of output terminals, and the voltage output by each output terminal is different in magnitude, so that the power module 260 can be connected to the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250 through different output terminals, to respectively provide suitable power for the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250, thereby ensuring that the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250 can stably, efficiently and accurately operate under rated power.
Fig. 9 is a schematic structural diagram of another grounding current monitoring device according to an embodiment of the present invention. As shown in fig. 9, the power supply module 260 includes a switching power supply 261 and a second regulator 262; the output end of the second voltage stabilizer 262 is used as the output end of the power module 260, and the conversion power 261 is connected with the input end of the second voltage stabilizer 262; the conversion power source 261 is used for outputting a voltage, and the second voltage regulator 262 is used for providing a stable voltage to the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250.
The switching power supply 261 has a rectifying function, and the second voltage regulator has a voltage-regulating function. Specifically, the conversion power source 261 is connected to an input terminal of the second regulator 262, and the conversion power source 261 may output the rectified voltage to the second regulator 262. The output terminal of the second voltage stabilizer 262 is used as the output terminal of the power module 260, that is, the output terminal of the second voltage stabilizer 262 is respectively connected to the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250, and the second voltage stabilizer 262 can provide stable and suitable voltage for the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250, so as to ensure that the signal processing module 210, the signal conversion module 220, the control module 230, the display module 240 and the communication module 250 can stably, efficiently and accurately operate under rated power.
Fig. 10 is a schematic circuit diagram of a power module according to an embodiment of the present invention. As shown in fig. 10, the switching power source 261 includes a first dc-dc regulator chip 2611 of type URB2424LD, a second dc-dc regulator chip 2612 of type URA2415LD, and a third dc-dc regulator chip 2613 of type URB2409 YMD. For example, the first dc-dc voltage regulation chip 2611 may regulate an input 24V dc voltage; the second dc-dc voltage stabilization chip 2612 may step down the 24V dc voltage and output a 15V dc voltage; the third dc-dc regulator chip 2613 may step down the 24V dc voltage and output a 9V dc voltage. The second voltage stabilizer 262 includes a first voltage stabilization chip 2621 of model ADP7104ARDZ, a voltage reference chip 2622 of model ADP 421BRZ, a second voltage stabilization chip 2623 of model ADP7104ARDZ, a third voltage stabilization chip 2624 of model ADP7118AUJZ, and a fourth voltage stabilization chip 2625 of model ADP7118 AUJZ.
Optionally, the control module comprises a single chip microcomputer; the signal conversion module comprises an analog-to-digital converter; the model of the singlechip is CH563, and the model of the analog-to-digital converter is AD7616 BSTZ.
Specifically, the signal conversion module may adopt an analog-to-digital converter with a model number of AD7616BSTZ, and the control module may adopt a single chip microcomputer with a model number of CH 563. The analog-to-digital converter of the AD7616BSTZ model can convert the acquired analog quantity grounding current into digital quantity grounding current so as to improve the anti-interference performance of current data. The single chip microcomputer of the CH563 type can calculate the effective value of the high-precision analog quantity grounding current according to all the received digital quantity grounding currents.
Illustratively, an analog-to-digital converter of AD7616BSTZ type acquires signals processed by a signal processing module within one period (20ms) of analog ground current with a sampling period of 200ms, that is, 100 groups of analog ground current data can be acquired, and an effective value I of a ground line current of a device to be monitored is obtained through calculation by a single chip microcomputer of CH563 type, and the calculation formula is as follows:
in the above formula: i is the effective value of the earth wire current of the equipment to be monitored, N is the sampling times, INAnd the digital quantity grounding current collected for the Nth time.
Fig. 11 is a schematic structural diagram of a ground current monitoring system according to an embodiment of the present invention. As shown in fig. 11, the ground current monitoring system includes a ground current monitoring device 001, a device to be monitored 002 and a remote monitoring device 003; the grounding current monitoring device 001 is connected with a grounding wire of the equipment to be monitored 002, and the grounding current monitoring device 001 is in remote communication with the remote monitoring equipment 003; the ground current monitoring device 001 is used for detecting the effective value of the analog quantity ground current flowing out of the ground wire, and the remote monitoring equipment 003 is used for displaying the effective value of the analog quantity ground current flowing out of the ground wire of the equipment to be monitored 002.
Wherein, wireless communication is adopted between the grounding current monitoring device 001 and the remote monitoring equipment 003. The grounding current monitoring system comprises the grounding current monitoring device 001 provided by any embodiment of the utility model, so that the grounding current monitoring system has the beneficial effects of the grounding current monitoring device 001 provided by the embodiment of the utility model, and the details are not repeated herein.
Optionally, the device to be monitored comprises a power transformer.
When two or more points of the transformer core are grounded, circulation current can be generated in the transformer core, so that the transformer core is locally overheated, even the iron core is locally burnt, and the safe operation of the transformer can be seriously threatened, so that the monitoring of the grounding current of the transformer core is very important in the operation process of the transformer.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A grounding current monitoring device is characterized by comprising a signal processing module, a signal conversion module, a control module and a display module;
the first end of the signal processing module is connected with a grounding wire of equipment to be monitored, the second end of the signal processing module is connected with the first end of the signal conversion module, the second end of the signal conversion module is connected with the first end of the control module, and the second end of the control module is connected with the display module;
the signal processing module is used for amplifying the inflow analog quantity grounding current; the signal conversion module is used for collecting the analog quantity grounding current and converting the analog quantity grounding current into digital quantity grounding current; the control module is used for calculating an effective value of the analog quantity grounding current according to the digital quantity grounding current; the display module is used for displaying the effective value of the analog quantity grounding current.
2. The ground current monitoring device according to claim 1, characterized in that the signal processing module comprises an amplifying unit;
the first end of the amplifying unit is connected with a grounding wire of the device to be monitored, and the second end of the amplifying unit is connected with the first end of the signal conversion module; the amplifying unit is used for amplifying the analog quantity grounding current flowing in.
3. The ground current monitoring device according to claim 2, characterized in that the amplifying unit comprises an amplifier and a first voltage regulator;
the input end of the amplifier is used as the first end of the amplifying unit, the output end of the amplifier is used as the second end of the amplifying unit, and the output end of the first voltage stabilizer is connected with the power supply end of the amplifier;
the first voltage stabilizer is used for providing stable voltage for the amplifier, and the amplifier is used for amplifying the analog quantity grounding current flowing in.
4. The ground current monitoring device according to claim 3, characterized in that the signal processing module further comprises a filtering unit;
the first end of the filtering unit is used as the first end of the signal processing module, and the second end of the filtering unit is connected with the first end of the amplifying unit; the filtering unit is used for filtering noise waves doped in the inflow analog quantity grounding current.
5. The ground current monitoring device according to claim 1, further comprising a communication module, wherein the communication module is connected to the control module, and the communication module is configured to transmit the effective value of the analog ground current to a remote monitoring device.
6. The ground current monitoring device of claim 5, further comprising a power module;
the output end of the power supply module is respectively connected with the signal processing module, the signal conversion module, the control module, the display module and the communication module, and the power supply module is used for supplying power to the signal processing module, the signal conversion module, the control module, the display module and the communication module.
7. The ground current monitoring device according to claim 6, wherein the power module comprises a switching power supply and a second voltage regulator;
the output end of the second voltage stabilizer is used as the output end of the power supply module, and the switching power supply is connected with the input end of the second voltage stabilizer; the conversion power supply is used for outputting voltage, and the second voltage stabilizer is used for providing stable voltage for the signal processing module, the signal conversion module, the control module, the display module and the communication module.
8. The ground current monitoring device of claim 1, wherein the control module comprises a single chip; the signal conversion module comprises an analog-to-digital converter;
the model of the single chip microcomputer is CH563, and the model of the analog-to-digital converter is AD7616 BSTZ.
9. An earth current monitoring system, characterized by comprising the earth current monitoring device of any one of claims 1-8, equipment to be monitored and remote monitoring equipment;
the grounding current monitoring device is connected with a grounding wire of the equipment to be monitored, and the grounding current monitoring device is in remote communication with the remote monitoring equipment; the ground current monitoring device is used for detecting the effective value of the analog quantity ground current flowing out of the ground wire, and the remote monitoring equipment is used for displaying the effective value of the analog quantity ground current flowing out of the ground wire of the equipment to be monitored.
10. The ground current monitoring system of claim 9, wherein the device to be monitored comprises a power transformer.
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| CN202220295499.3U CN216979169U (en) | 2022-02-14 | 2022-02-14 | Grounding current monitoring device and system |
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| CN202220295499.3U CN216979169U (en) | 2022-02-14 | 2022-02-14 | Grounding current monitoring device and system |
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