CN211236630U - Intelligent low-power-consumption AC/DC high-voltage meter - Google Patents

Intelligent low-power-consumption AC/DC high-voltage meter Download PDF

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Publication number
CN211236630U
CN211236630U CN201922356267.5U CN201922356267U CN211236630U CN 211236630 U CN211236630 U CN 211236630U CN 201922356267 U CN201922356267 U CN 201922356267U CN 211236630 U CN211236630 U CN 211236630U
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magnetic latching
triode
resistor
sampling
measuring
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李虎
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Wuhan Huayi Power Technology Co ltd
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Wuhan Huayi Power Technology Co ltd
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Abstract

An intelligent low-power consumption AC/DC high-voltage meter comprises a measuring host machine for sampling and measuring input electric signals and displaying sampling and measuring results, wherein the measuring host machine comprises a DC sampling and measuring unit, an AC peak value sampling and measuring unit and an AC effective value sampling and measuring unit, and also comprises a resistance-capacitance voltage divider for converting high-voltage electric signals into low-voltage electric signals, the input end of the measuring host machine is provided with four magnetic latching relays, the signal input ends of the four magnetic latching relays are connected with the signal output end of the resistance-capacitance voltage divider and are used for accessing low-voltage DC or AC electric signals output by the resistance-capacitance voltage divider, the signal output end of a first magnetic latching relay is accessed into the DC sampling and measuring unit, the signal output end of a second magnetic latching relay is accessed into the AC sampling and measuring unit, and the signal output end of a, and the signal output end of the fourth magnetic latching relay is connected with an alternating current effective value sampling and measuring unit.

Description

Intelligent low-power-consumption AC/DC high-voltage meter
Technical Field
The utility model relates to an electric power industry's alternating current-direct current high-voltage measurement field, concretely relates to intelligence low-power consumption alternating current-direct current high-voltage meter.
Background
At present, the mainstream control boxes in the power industry are divided into two types: a is for switching over the measuring range and measurement project manually, this method needs a plurality of mechanical switches to operate, the cost is higher, the operation feedback is unfriendly, the situation of the easy misoperation that causes; in addition, each single chip microcomputer controls one relay to adjust the access of the high-voltage and low-voltage potentiometer, the method occupies single chip microcomputer resources, and the power consumption of the plurality of relays is large, so that the power supply of the equipment by adopting a battery is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an intelligent low-power consumption alternating current-direct current high-voltage meter, which comprises a measuring host computer used for sampling and measuring the input electric signal and displaying the sampling and measuring result, wherein the measuring host computer comprises four sampling and measuring units, namely a direct current sampling and measuring unit used for carrying out direct current sampling and measuring on the input electric signal, an alternating current sampling and measuring unit used for carrying out alternating current sampling and measuring, an alternating current peak value sampling and measuring unit used for carrying out alternating current peak value sampling and measuring, and an effective resistance-capacitance voltage divider used for converting a high-voltage alternating current or direct current signal into a low-voltage direct current or alternating current signal, the input end of the measuring host computer is provided with four magnetic latching relays, namely a first magnetic latching relay, a second magnetic latching relay, a third magnetic latching relay and a fourth magnetic latching relay, the signal input ends of the four magnetic latching relays are connected with the signal output end of the resistance-capacitance voltage divider and used for being connected with low-voltage direct current or alternating current signals output by the resistance-capacitance voltage divider, the signal output end of the first magnetic latching relay is connected with the direct current sampling measuring unit of the measuring host, the signal output end of the second magnetic latching relay is connected with the alternating current sampling measuring unit of the measuring host, the signal output end of the third magnetic latching relay is connected with the alternating current peak value sampling measuring unit of the measuring host, and the signal output end of the fourth magnetic latching relay is connected with the alternating current effective value sampling measuring unit of the measuring host.
Furthermore, the measurement host machine further comprises a microcontroller for controlling the on-off of the four magnetic latching relays, and the microcontroller is respectively connected with the control ends of the four magnetic latching relays, and sends control signals to the four magnetic latching relays to control the on-off of the four magnetic latching relays.
Further, the microcontroller is an STC15F104W microcontroller, the STC15F104W microcontroller has 6 independent IO ports, the measurement host further includes four drive circuits, which are a first drive circuit, a second drive circuit, a third drive circuit and a fourth drive circuit, respectively, the first IO port of the STC15F104W microcontroller is connected with the control end of the first magnetic latching relay through the first drive circuit, the second first IO port is connected with the control end of the second magnetic latching relay through the second drive circuit, the third IO port is connected with the control end of the third magnetic latching relay through the third drive circuit, and the fourth IO port is connected with the control end of the fourth magnetic latching relay through the fourth drive circuit.
Further, the first driving circuit comprises a resistor R11, a resistor R12, a resistor R13, a first triode and a second triode, a first IO port of the STC15F104W microcontroller is respectively connected with bases of the first triode and the second triode through a resistor R13, an emitter of the first triode is connected with a first magnetic latching coil of the first magnetic latching relay, a collector of the first triode is grounded through a resistor R11, a collector of the second triode is connected with a second magnetic latching coil of the first magnetic latching relay, and a transmitter is grounded through a resistor R12;
the second driving circuit comprises a resistor R21, a resistor R22, a resistor R23, a third triode and a fourth triode, a second IO port of the STC15F104W microcontroller is respectively connected with bases of the third triode and the fourth triode through a resistor R23, an emitter of the third triode is connected with a first magnetic latching coil of the second magnetic latching relay, a collector of the third triode is grounded through a resistor R21, a collector of the fourth triode is connected with a second magnetic latching coil of the second magnetic latching relay, and a transmitter is grounded through a resistor R22;
the third driving circuit comprises a resistor R31, a resistor R32, a resistor R33, a fifth triode and a sixth triode, a third IO port of the STC15F104W microcontroller is respectively connected with bases of the fifth triode and the sixth triode through a resistor R33, an emitter of the fifth triode is connected with a first magnetic latching coil of a third magnetic latching relay, a collector of the fifth triode is grounded through a resistor R31, a collector of the sixth triode is connected with a second magnetic latching coil of the third magnetic latching relay, and a transmitter is grounded through a resistor R32;
the fourth driving circuit comprises a resistor R41, a resistor R42, a resistor R43, a seventh triode and an eighth triode, a fourth IO port of the STC15F104W microcontroller is respectively connected with bases of the seventh triode and the eighth triode through a resistor R33, an emitter of the seventh triode is connected with a first magnetic latching coil of the fourth magnetic latching relay, a collector of the seventh triode is grounded through a resistor R41, a collector of the eighth triode is connected with a second magnetic latching coil of the fourth magnetic latching relay, and a transmitter is grounded through a resistor R42.
Furthermore, a key switch is further included, a fifth IO port of the STC15F104W microcontroller is connected to a 5V voltage through the key switch, and the fifth IO port is further grounded through a resistor R4.
Further, the resistance-capacitance voltage divider includes high-voltage equalizing ring, insulating cylinder, box, is used for making the ground connection post of resistance-capacitance voltage divider ground connection and is used for the signal output port with the signal of telecommunication output after the conversion of resistance-capacitance voltage divider, high-voltage equalizing ring pass through the insulating cylinder install in on the box, ground connection post and signal output part all set up in on the box.
Furthermore, the measurement host computer still includes the casing, be provided with the liquid crystal display that is used for showing the sampling result on the casing, be used for showing the function pilot lamp of sampling project, be used for switching over the button change over switch of sampling project, be used for inserting the signal input port of input electrical signal, liquid crystal display, function pilot lamp and button change over switch all with STC15F104W microcontroller is connected, signal input port is connected with resistance-capacitance voltage divider signal output port for insert the low pressure direct current or the alternating current signal of resistance-capacitance voltage divider output.
Further, the function indicator lamps comprise a direct current indicator lamp, an alternating current indicator lamp, a peak value indicator lamp and an effective value indicator lamp.
Further, a measurement range switch is arranged on the shell and connected with the STC15F104W microcontroller.
The utility model discloses following beneficial effect has:
1. the utility model discloses a magnetic latching relay switches sampling item, only switches at magnetic latching relay and needs the consumption in the twinkling of an eye, and the hold time does not need consume power, greatly reduced circuit consumption.
2. The magnetic latching relay is controlled through the microcontroller, and through the driving circuit, two magnetic latching coils of the magnetic latching relay can be controlled through one IO port of the microcontroller, so that the using amount of the IO port of the main control chip is greatly reduced, the main control chip with fewer IO ports can be selected, and the cost of the main control chip is greatly reduced.
Drawings
Fig. 1 is an overall circuit connection diagram of an intelligent low-power consumption ac/dc high-voltage meter provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit connection between a microprocessor and a magnetic latching relay according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit connection between a microprocessor and a key switch according to an embodiment of the present invention;
fig. 4 is an external structure diagram of a rc voltage divider according to an embodiment of the present invention;
fig. 5 is an external structure diagram of the measurement host provided in the embodiment of the present invention.
Description of reference numerals: 1. liquid crystal display, 2, function pilot lamp, 3, button change over switch, 4, measuring range change over switch, 5, signal input port, 6, high-voltage equalizer ring, 7, insulating cylinder, 8, ground post, 9, signal output port, 10, box.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an intelligent low-power consumption ac/dc high-voltage meter, which includes a measurement host for sampling and measuring an input electrical signal and displaying a sampling measurement result, the measurement host includes four sampling measurement units, a dc sampling measurement unit for performing dc sampling measurement on the input electrical signal, an ac sampling measurement unit for performing ac sampling measurement, an ac peak sampling measurement unit for performing ac peak sampling measurement, and an ac effective value sampling measurement unit for performing ac effective value sampling measurement, and further includes a resistance-capacitance divider for converting a high-voltage ac or dc signal into a low-voltage dc or ac signal, the input end of the measurement host is provided with four magnetic latching relays, which are a first magnetic latching relay, a second magnetic latching relay, a third magnetic latching relay, and a fourth magnetic latching relay, the signal input ends of the four magnetic latching relays are connected with the signal output end of the resistance-capacitance voltage divider and used for being connected with low-voltage direct current or alternating current signals output by the resistance-capacitance voltage divider, the signal output end of the first magnetic latching relay is connected with the direct current sampling measuring unit of the measuring host, the signal output end of the second magnetic latching relay is connected with the alternating current sampling measuring unit of the measuring host, the signal output end of the third magnetic latching relay is connected with the alternating current peak value sampling measuring unit of the measuring host, and the signal output end of the fourth magnetic latching relay is connected with the alternating current effective value sampling measuring unit of the measuring host.
In the above embodiment, switching of sampling items is realized by controlling on/off states of four magnetic latching relays, for example, a first magnetic latching relay is controlled to be on, other magnetic latching relays are controlled to be off, and an input electrical signal is connected to a direct current sampling measurement unit, so that direct current sampling measurement is performed on the input electrical signal, the magnetic latching relays only need power consumption at the switching moment, power consumption does not need to be consumed in a holding time, and power consumption of a circuit can be greatly reduced.
Preferably, the measurement host further comprises a microcontroller for controlling on/off of the four magnetic latching relays, and the microcontroller is connected with the control ends of the four magnetic latching relays respectively, and sends control signals to the four magnetic latching relays to control on/off of the four magnetic latching relays.
Preferably, the microcontroller is an STC15F104W microcontroller, the STC15F104W microcontroller includes an internal oscillation circuit and an internal reset circuit, and can operate independently without adding any external devices, the STC15F104W microcontroller has 6 independent IO ports, the measurement host further includes four driving circuits, which are respectively a first driving circuit, a second driving circuit, a third driving circuit and a fourth driving circuit, the first IO port of the STC15F104W microcontroller is connected to the control terminal of the first magnetic latching relay through the first driving circuit, the second IO port is connected to the control terminal of the second magnetic latching relay through the second driving circuit, the third IO port is connected to the control terminal of the third magnetic latching relay through the third driving circuit, and the fourth IO port is connected to the control terminal of the fourth magnetic latching relay through the fourth driving circuit.
Preferably, the first driving circuit includes a resistor R11, a resistor R12, a resistor R13, a first triode and a second triode, the first IO port of the STC15F104W microcontroller is connected to the bases of the first triode and the second triode respectively through a resistor R13, the emitter of the first triode is connected to the first magnetic latching coil of the first magnetic latching relay, the collector of the first triode is grounded through a resistor R11, the collector of the second triode is connected to the second magnetic latching coil of the first magnetic latching relay, and the transmitter is grounded through a resistor R12, as shown in fig. 2, for example, when the first IO port outputs a high level, the first triode is turned on, the second triode is turned off, and the magnetic latching relay is attracted and held; when the first IO port outputs a low level, the first triode is conducted, the second triode is cut off, the magnetic latching relay is disconnected and kept, when the first IO port is set to be in a high-resistance state, the first triode and the second triode are both cut off, the coil of the magnetic latching relay is not electrified and does not act, and the method can expand the control quantity of IO.
The second driving circuit comprises a resistor R21, a resistor R22, a resistor R23, a third triode and a fourth triode, a second IO port of the STC15F104W microcontroller is respectively connected with bases of the third triode and the fourth triode through a resistor R23, an emitter of the third triode is connected with a first magnetic latching coil of the second magnetic latching relay, a collector of the third triode is grounded through a resistor R21, a collector of the fourth triode is connected with a second magnetic latching coil of the second magnetic latching relay, and a transmitter is grounded through a resistor R22;
the third driving circuit comprises a resistor R31, a resistor R32, a resistor R33, a fifth triode and a sixth triode, a third IO port of the STC15F104W microcontroller is respectively connected with bases of the fifth triode and the sixth triode through a resistor R33, an emitter of the fifth triode is connected with a first magnetic latching coil of a third magnetic latching relay, a collector of the fifth triode is grounded through a resistor R31, a collector of the sixth triode is connected with a second magnetic latching coil of the third magnetic latching relay, and a transmitter is grounded through a resistor R32;
the fourth driving circuit comprises a resistor R41, a resistor R42, a resistor R43, a seventh triode and an eighth triode, a fourth IO port of the STC15F104W microcontroller is respectively connected with bases of the seventh triode and the eighth triode through a resistor R33, an emitter of the seventh triode is connected with a first magnetic latching coil of the fourth magnetic latching relay, a collector of the seventh triode is grounded through a resistor R41, a collector of the eighth triode is connected with a second magnetic latching coil of the fourth magnetic latching relay, and a transmitter is grounded through a resistor R42.
The circuit connection diagrams of the second driving circuit, the third driving circuit and the fourth driving circuit are similar to those of fig. 2, and are not shown one by one here.
Preferably, a key switch 3 is further included, the fifth IO port of the STC15F104W microcontroller is connected to a 5V voltage through the key switch 3, and the fifth IO port is further grounded through a resistor R4, as shown in fig. 3, when no key is pressed, the microcontroller detects a low level, if the key is pressed, the microcontroller detects a high level, and the number of times of pressing is stored and recorded each time the key is pressed, for example, when the key is pressed for the first time, the first magnetic latching relay is controlled to be attracted, when the key is pressed for the second time, the second magnetic latching relay is controlled to be attracted, and so on, so that the function switching is cycled among four effective values of direct current, alternating current peak value and alternating current.
Preferably, as shown in fig. 4, the resistance-capacitance voltage divider includes a high voltage equalizing ring 6, an insulating cylinder 7, a box 10, a grounding column 8 for grounding the resistance-capacitance voltage divider and a signal output port 9 for outputting an electrical signal converted by the resistance-capacitance voltage divider, the high voltage equalizing ring is installed on the box 10 through the insulating cylinder 7, the grounding column 8 and the signal output port 9 are both disposed on the box 10, and the resistance-capacitance voltage divider divides the high voltage electrical signal by using a high precision resistance capacitor, for example, the voltage division ratio is 1000, so as to convert an alternating current or direct current high voltage electrical signal into a low voltage direct current or alternating current electrical signal.
Preferably, as shown in fig. 5, the measurement host further includes a housing, the housing is provided with a liquid crystal display screen 1 for displaying a sampling result, a function indicator lamp 2 for displaying a sampling item, a key switch 3 for switching the sampling item, and a signal input port 5 for accessing an input electrical signal, the liquid crystal display screen 1, the function indicator lamp 2, and the key switch 3 are all connected to the STC15F104W microcontroller, and the signal input port 5 is connected to a signal output port 9 of the resistance-capacitance voltage divider for accessing a low-voltage direct current or alternating current signal output by the resistance-capacitance voltage divider.
Preferably, the function indicator lamps 2 include a direct current indicator lamp, an alternating current indicator lamp, a peak indicator lamp and an effective value indicator lamp, and when the high-voltage meter is in a certain item sampling test, the corresponding indicator lamps are controlled to be on.
Preferably, a measuring range selector switch 4 for controlling a measuring range is further disposed on the housing, and the measuring range selector switch 4 is connected with the STC15F104W microcontroller.
It should be noted that all the "connections" of the present invention are represented as electrical connections.
It should be noted that the claimed solution of the present invention is to select and connect various hardware devices, and those skilled in the art can obtain the corresponding upper program without objection when learning the hardware solution of the present invention, so that the claimed solution of the present invention does not relate to the improvement of the program.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (9)

1. An intelligent low-power consumption AC/DC high-voltage meter comprises a measuring host machine used for sampling and measuring input electric signals and displaying sampling and measuring results, wherein the measuring host machine comprises four sampling and measuring units, namely a DC sampling and measuring unit used for carrying out DC sampling and measuring on the input electric signals, an AC sampling and measuring unit used for carrying out AC sampling and measuring, an AC peak value sampling and measuring unit used for carrying out AC peak value sampling and measuring and an AC effective value sampling and measuring unit used for carrying out AC effective value sampling and measuring, the intelligent low-power consumption AC/DC high-voltage meter is characterized by also comprising a resistance-capacitance voltage divider used for converting high-voltage AC or DC signals into low-voltage DC or AC signals, four magnetic latching relays are arranged at the input end of the measuring host machine, and are respectively a first magnetic latching relay, a second magnetic latching relay, a third magnetic latching relay and a fourth magnetic latching, the signal input ends of the four magnetic latching relays are connected with the signal output end of the resistance-capacitance voltage divider and used for being connected with low-voltage direct current or alternating current signals output by the resistance-capacitance voltage divider, the signal output end of the first magnetic latching relay is connected with the direct current sampling measuring unit of the measuring host, the signal output end of the second magnetic latching relay is connected with the alternating current sampling measuring unit of the measuring host, the signal output end of the third magnetic latching relay is connected with the alternating current peak value sampling measuring unit of the measuring host, and the signal output end of the fourth magnetic latching relay is connected with the alternating current effective value sampling measuring unit of the measuring host.
2. The intelligent low-power consumption alternating-current/direct-current/high-voltage meter according to claim 1, wherein the measurement host further comprises a microcontroller for controlling on/off of the four magnetic latching relays, and the microcontroller is respectively connected with control ends of the four magnetic latching relays and sends control signals to the four magnetic latching relays to control on/off of the four magnetic latching relays.
3. The intelligent low-power consumption AC/DC high-voltage meter according to claim 2, wherein the microcontroller is an STC15F104W microcontroller, the STC15F104W microcontroller has 6 independent IO ports, the measurement host further comprises four driving circuits, namely a first driving circuit, a second driving circuit, a third driving circuit and a fourth driving circuit, the first IO port of the STC15F104W microcontroller is connected with the control terminal of the first magnetic latching relay through the first driving circuit, the second IO port is connected with the control terminal of the second magnetic latching relay through the second driving circuit, the third IO port is connected with the control terminal of the third magnetic latching relay through the third driving circuit, and the fourth IO port is connected with the control terminal of the fourth magnetic latching relay through the fourth driving circuit.
4. The intelligent low-power consumption AC/DC high-voltage meter according to claim 3,
the first driving circuit comprises a resistor R11, a resistor R12, a resistor R13, a first triode and a second triode, a first IO port of the STC15F104W microcontroller is respectively connected with bases of the first triode and the second triode through a resistor R13, an emitter of the first triode is connected with a first magnetic latching coil of a first magnetic latching relay, a collector of the first triode is grounded through a resistor R11, a collector of the second triode is connected with a second magnetic latching coil of the first magnetic latching relay, and a transmitter is grounded through a resistor R12;
the second driving circuit comprises a resistor R21, a resistor R22, a resistor R23, a third triode and a fourth triode, a second IO port of the STC15F104W microcontroller is respectively connected with bases of the third triode and the fourth triode through a resistor R23, an emitter of the third triode is connected with a first magnetic latching coil of the second magnetic latching relay, a collector of the third triode is grounded through a resistor R21, a collector of the fourth triode is connected with a second magnetic latching coil of the second magnetic latching relay, and a transmitter is grounded through a resistor R22;
the third driving circuit comprises a resistor R31, a resistor R32, a resistor R33, a fifth triode and a sixth triode, a third IO port of the STC15F104W microcontroller is respectively connected with bases of the fifth triode and the sixth triode through a resistor R33, an emitter of the fifth triode is connected with a first magnetic latching coil of a third magnetic latching relay, a collector of the fifth triode is grounded through a resistor R31, a collector of the sixth triode is connected with a second magnetic latching coil of the third magnetic latching relay, and a transmitter is grounded through a resistor R32;
the fourth driving circuit comprises a resistor R41, a resistor R42, a resistor R43, a seventh triode and an eighth triode, a fourth IO port of the STC15F104W microcontroller is respectively connected with bases of the seventh triode and the eighth triode through a resistor R33, an emitter of the seventh triode is connected with a first magnetic latching coil of the fourth magnetic latching relay, a collector of the seventh triode is grounded through a resistor R41, a collector of the eighth triode is connected with a second magnetic latching coil of the fourth magnetic latching relay, and a transmitter is grounded through a resistor R42.
5. The intelligent low-power consumption AC/DC high-voltage meter according to claim 3, further comprising a push-button switch, wherein the fifth IO port of the STC15F104W microcontroller is connected to 5V voltage through the push-button switch, and the fifth IO port is further connected to ground through a resistor R4.
6. The intelligent low-power consumption alternating-current/direct-current/high-voltage meter according to claim 1, wherein the resistance-capacitance voltage divider comprises a high-voltage equalizing ring, an insulating cylinder, a box body, a grounding column for grounding the resistance-capacitance voltage divider and a signal output port for outputting an electric signal converted by the resistance-capacitance voltage divider, the high-voltage equalizing ring is mounted on the box body through the insulating cylinder, and the grounding column and the signal output port are both arranged on the box body.
7. The intelligent low-power consumption alternating-current/direct-current/high-voltage meter according to claim 3, wherein the measurement host further comprises a housing, the housing is provided with a liquid crystal display for displaying a sampling result, a function indicator lamp for displaying a sampling item, a key switch for switching the sampling item, and a signal input port for accessing an input electrical signal, the liquid crystal display, the function indicator lamp, and the key switch are all connected with the STC15F104W microcontroller, and the signal input port is connected with a signal output port of the resistance-capacitance voltage divider and used for accessing a low-voltage direct-current or alternating-current electrical signal output by the resistance-capacitance voltage divider.
8. The intelligent low-power consumption alternating-current and direct-current high-voltage meter according to claim 7, wherein the function indicator lamps comprise a direct-current indicator lamp, an alternating-current indicator lamp, a peak indicator lamp and a valid value indicator lamp.
9. The intelligent low-power consumption AC/DC high-voltage meter according to claim 7, wherein a measurement range switch is further disposed on the housing, and the measurement range switch is connected to the STC15F104W microcontroller.
CN201922356267.5U 2019-12-25 2019-12-25 Intelligent low-power-consumption AC/DC high-voltage meter Active CN211236630U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113094313A (en) * 2021-04-15 2021-07-09 江西省水投江河信息技术有限公司 Water conservancy RTU interface multiplexing and low-power consumption realization system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113094313A (en) * 2021-04-15 2021-07-09 江西省水投江河信息技术有限公司 Water conservancy RTU interface multiplexing and low-power consumption realization system

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