CN212845894U - Real-time monitoring circuit for line condition of user electric meter - Google Patents
Real-time monitoring circuit for line condition of user electric meter Download PDFInfo
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- CN212845894U CN212845894U CN202020921450.5U CN202020921450U CN212845894U CN 212845894 U CN212845894 U CN 212845894U CN 202020921450 U CN202020921450 U CN 202020921450U CN 212845894 U CN212845894 U CN 212845894U
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Abstract
The utility model discloses a real-time monitoring circuit of user's ammeter circuit condition, including user's ammeter circuit, difference amplifier module and voltage comparator module, PNP triode circuit, the warning device that are used for connecting the user's ammeter, difference amplifier module includes difference amplification processing unit, single-ended signal isolation output unit and output single-ended signal zero setting circuit, produces voltage when there is not the short circuit at user's ammeter both ends, does not drive warning device; and when the differential amplification processing unit detects short circuits at two ends of the user ammeter, the warning device is driven to give an alarm. The utility model discloses the short-circuit fault of branch line port where the user ammeter is located is monitored on line in real time; and after the short circuit fault of the branch line port where the user electric meter is located is monitored, a warning lamp is generated to flash and give an alarm.
Description
Technical Field
The utility model relates to a connect the technical field of user's ammeter's circuit real-time supervision, concretely relates to technique of real-time supervision circuit of user's ammeter circuit condition.
Background
With the rapid development of the social and economic level, the continuously rising power demand promotes the development of the power industry and promotes the comprehensive upgrade of the power grid system. In order to improve the service quality of the power industry and bring better electricity consumption experience for residents, the construction of the smart power grid is also carried out rapidly. At present, in the construction of a smart power grid, a low-voltage centralized meter reading system is more and more mature, and is applied to a plurality of places, so that intelligent remote meter reading is realized, and the meter reading efficiency and the electronization settlement rate are effectively improved. However, the low-voltage meter reading system still has some problems, and RS485 short circuit faults sometimes occur in the meter reading system. When the short circuit fault occurs at the port of the RS485, the communication paralysis of the RS485 area can be caused, no reliable tool can be used for quickly positioning a fault point at present, the fault detection can be carried out only by a binary breakpoint method, the troubleshooting and the processing are required to be carried out for one day or even longer, and the electronic settlement rate and the online rate are seriously influenced. And the RS485 is the name of a cable.
Therefore, it is very important to monitor the line condition of the user electric meter in real time.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a real-time monitoring circuit of user's ammeter circuit condition carries out real-time supervision to the branch circuit condition of connecting the user's ammeter, warns when the short circuit appears, plays and carries out fault indication to short circuit department, does benefit to fortune dimension personnel and discovers the fault point fast.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a real-time supervision circuit of user's ammeter line condition which characterized in that: the real-time monitoring circuit for the line condition of the user electric meter comprises a user electric meter line, a differential amplifier module, a voltage comparator module, a PNP triode circuit and a warning device, wherein the user electric meter line is used for being connected with a user electric meter; the single-ended signal isolation output unit comprises a fifth second chip, the fifth second chip is a voltage follower, the fifth second chip is provided with a positive input end, a negative input end and an output end, the output end of the fifth second chip is connected with the negative input end of the fifth second chip to form an isolated signal output end, the voltage comparator module comprises a sixth chip, a first four resistor and a first three resistor which are connected in series, the sixth chip is a voltage comparator, the sixth chip is provided with a third pin which is a positive input end and a second pin which is a reverse input end, the first pin is an output end, a series node of the first four resistor and the first three resistor is connected with a second pin of the sixth chip, the node voltage of the series node of the first four resistor and the first three resistor is 1V, the PNP triode circuit comprises a PNP triode, an input differential signal pin of the third chip of the differential amplification processing unit is connected with a user ammeter line, the output signal pin of the third chip of the differential amplification processing unit is connected with the positive input end of the fifth second chip of the single-ended signal isolation output unit through the first and second resistors, the isolated signal output end of the fifth second chip of the single-ended signal isolation output unit is connected with the positive input end of the sixth chip of the voltage comparator module, the output end of the sixth chip is in circuit connection with the PNP triode, the emitting electrode of the PNP triode is connected with the warning device circuit, the differential amplification processing unit detects two ends of the user ammeter, when no short circuit occurs at the two ends of the user electric meter, the differential amplification processing unit amplifies the voltage at the two ends of the user electric meter to the maximum 3.7V and sends the voltage to the voltage comparator module, when the voltage comparator module detects that the input voltage is greater than the threshold value 1V, outputting a high level, not driving the PNP triode, and not driving the warning device; when two ends of a user electric meter are short-circuited and the differential amplification processing unit detects that two ends of the user electric meter are short-circuited, two ends of the differential amplification processing unit are also short-circuited, at the moment, the differential amplification processing unit directly outputs a low level to the voltage comparator module, the voltage comparator module sets that an input voltage threshold value is greater than 1V and outputs a high level, and when the input voltage threshold value is less than 1V, the voltage comparator module outputs a low level, and the voltage comparator module outputs a low level and directly makes the PNP triode drive warning device give an alarm.
The warning device is an LED warning lamp. The LED is a Light Emitting Diode (LED) for short.
The third chip is provided with a second pin and a third pin to form the input differential signal pin, a sixth pin to form the output signal pin, a first pin and an eighth pin to form the amplification signal pin, a seventh resistor is connected in series between the first pin and the eighth pin and used for amplifying output voltage, the seventh resistor is used for adjusting amplification factor, and a fifth pin to form the input reference voltage pin, so that the output of the sixth pin is more accurate.
The differential amplification processing unit further comprises an output single-ended signal zero setting circuit, the output single-ended signal zero setting circuit comprises a fifth chip, the fifth chip is a voltage follower and is used for connecting a fifth pin of the third chip, the positive input end of the fifth chip is connected with an eighth resistor and a ninth resistor, one end of the eighth resistor is connected with a positive voltage, the other end of the eighth resistor is connected with one end of the ninth resistor and is connected with the positive input end of the fifth chip together, one end of the ninth resistor is connected with a negative voltage, the eighth resistor and the ninth resistor are connected in series with a node which is 0V to form the zero setting device, and the voltage of the fifth pin of the third chip is 0V.
The utility model discloses following beneficial effect has:
the utility model discloses the real-time supervision circuit of user's ammeter circuit condition is owing to including the user's ammeter circuit that is used for connecting the user's ammeter, differential amplifier module and voltage comparator module, PNP triode circuit, warning device, consequently utilize differential amplifier module and voltage comparator module to carry out real-time supervision to the circuit condition, when the short circuit appears, light the warning light and warn, play and carry out fault indication's effect to the short circuit department, be favorable to fortune dimension personnel to discover the fault point fast, improve fortune dimension efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a portion of a circuit within a real-time monitoring circuit for line conditions of a consumer electric meter according to the present invention;
fig. 2 is the utility model discloses use in the circuit schematic diagram in ammeter RS485 branch line short circuit fault warning device.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.
The utility model discloses real-time supervision circuit of user's ammeter circuit condition, including the user's ammeter circuit, difference amplifier module and voltage comparator module, PNP triode circuit, the warning device that are used for connecting the user's ammeter, difference amplifier module includes difference amplification processing unit, single-ended signal keeps apart output unit and output single-ended signal zero setting circuit, and output single-ended signal zero setting circuit carries out the circuit connection with difference amplification processing unit and is used for difference amplifier module's output direct current signal zero setting, and difference amplification processing unit includes the third chip, the third chip mainly constitutes a difference amplifier through operational amplifier, the third chip is equipped with input difference signal foot, output signal foot; the single-ended signal isolation output unit comprises a fifth second chip, the fifth second chip is a voltage follower, the fifth second chip is provided with a positive input end, a negative input end and an output end, the output end of the fifth second chip is connected with the negative input end of the fifth second chip to form an isolated signal output end, the voltage comparator module comprises a sixth chip, a first fourth resistor and a first third resistor which are connected in series, the sixth chip is a voltage comparator, the sixth chip is provided with a third pin which is a positive input end and a second pin which is a reverse input end, the first pin is an output end, a series node of the first fourth resistor and the first third resistor is connected with a second pin of the sixth chip, the node voltage of the series node of the first fourth resistor and the first third resistor is 1V, the PNP triode circuit comprises a PNP triode, and an input differential signal pin of the third chip of the differential amplification processing unit is connected with a user ammeter line, the output signal pin of the third chip of the differential amplification processing unit is connected with the positive input end of the fifth second chip of the single-ended signal isolation output unit through the first and second resistors, the isolated signal output end of the fifth second chip of the single-ended signal isolation output unit is connected with the positive input end of the sixth chip of the voltage comparator module, the output end of the sixth chip is in circuit connection with the PNP triode, the emitting electrode of the PNP triode is connected with the warning device circuit, the differential amplification processing unit detects two ends of the user ammeter, when no short circuit occurs at the two ends of the user electric meter, the differential amplification processing unit amplifies the voltage at the two ends of the user electric meter to the maximum 3.7V and sends the voltage to the voltage comparator module, when the voltage comparator module detects that the input voltage is greater than the threshold value 1V, outputting a high level, not driving the PNP triode, and not driving the warning device; when two ends of a user electric meter are short-circuited and the differential amplification processing unit detects that two ends of the user electric meter are short-circuited, two ends of the differential amplification processing unit are also short-circuited, at the moment, the differential amplification processing unit directly outputs a low level to the voltage comparator module, the voltage comparator module sets that an input voltage threshold value is greater than 1V and outputs a high level, and when the input voltage threshold value is less than 1V, the voltage comparator module outputs a low level, and the voltage comparator module outputs a low level and directly makes the PNP triode drive warning device give an alarm.
Wherein the warning device is an LED warning lamp. The third chip is provided with a second pin and a third pin to form the input differential signal pin, a sixth pin to form the output signal pin, a first pin and an eighth pin to form an amplification signal pin, a seventh resistor is connected in series between the first pin and the eighth pin to amplify output voltage, the seventh resistor is used for adjusting amplification factor, and a fifth pin to form an input reference voltage pin, so that the output of the sixth pin is more accurate. The differential amplification processing unit further comprises an output single-ended signal zero setting circuit, the output single-ended signal zero setting circuit comprises a fifth chip, the fifth chip is a voltage follower and is used for connecting a fifth pin of the third chip, the positive input end of the fifth chip is connected with an eighth resistor and a ninth resistor, one end of the eighth resistor is connected with a positive voltage, the other end of the eighth resistor is connected with one end of the ninth resistor and is connected with the positive input end of the fifth chip together, one end of the ninth resistor is connected with a negative voltage, the series node of the eighth resistor and the ninth resistor is 0V to form the zero setting device, and the voltage of the fifth pin of the third chip is 0V.
The utility model discloses accomplish following function: the warning device monitors the short-circuit fault of a branch line port of a user ammeter in real time on line; and after the short-circuit fault of the branch line port of the user electric meter is monitored, a warning lamp is generated to flash and give an alarm.
FIG. 1 is a schematic diagram of a portion of a circuit within a real-time monitoring circuit for line conditions of a consumer electric meter according to the present invention; fig. 2 is the utility model discloses the real-time supervision circuit of user's ammeter circuit condition is used for ammeter RS485 branch line short circuit fault warning device's example mode. Ammeter RS485 branch line short-circuit fault warning device is except including the utility model discloses the real-time supervision circuit of user's ammeter circuit condition still including two way relay drive module, shell and power module, power module truns commercial power 220V into 5V constant voltage power supply.
Wherein the relay coil and the relay double-way switch form two paths of relays, the triode is a PNP triode and is used for controlling the conduction of a 5V power supply so as to control the power supply switch of the relay double-way switch, the relay coil is used for controlling the opening and closing of the relay double-way switch, the two paths of relays are provided with a first pin and an eighth pin to form a relay coil pin, an emitting electrode of the triode is electrically connected with the eighth pin of the two paths of relays, the first pin is connected with a power supply ground, the two paths of relays are also provided with a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin, the fourth pin, the fifth pin and the sixth pin form a first path of relays, the second pin, the third pin and the fourth pin form a second path of relays, and the fourth pin and the fifth pin of the two paths of relays are disconnected and, the sixth pin and the seventh pin are closed by default, the second pin and the third pin are closed by default, the third pin and the sixth pin are used for connecting an RS485 trunk line interface, the second pin and the seventh pin are used for connecting an RS485 branch line interface, namely a user electric meter interface, the output end of the differential amplifier module is connected with the input end of the voltage comparator module, the output end of the voltage comparator module is divided into two paths, one path is connected with the base electrode of the triode, the other path is connected with the warning lamp module, the collector of the triode is connected with a 5V power supply, the input differential signal end of the differential amplifier module is connected with an RS485 branch line interface, namely a user electric meter interface, the differential amplifier module and the voltage comparator module are used for monitoring the RS485 branch line condition of the electric meter in real time, when a short circuit occurs, the two relays are driven to disconnect the RS485 trunk line, and the LED warning lamp is turned on to warn.
The differential amplifier module detects the AB both ends of user's ammeter, produces voltage when there is not the short circuit at the AB both ends of user's ammeter, and differential amplifier amplifies the voltage of the AB both ends of user's ammeter to the highest 3.7V and gives the voltage comparator module this moment, and output high level when the voltage comparator module detects that input voltage is greater than threshold value 1V, so do not drive the PNP triode, do not drive the warning light. In the figure, a differential amplifier is a core component of a differential amplification processing unit in a differential amplifier module, and a voltage comparator is a core component of a voltage comparator module.
As shown in fig. 2, when the two ends of the user electric meter AB are short-circuited and the differential amplifier module detects the short circuit of the two ends of the user electric meter AB, the two ends of the differential amplifier are also short-circuited, at this time, the differential amplifier directly outputs a low level (-1V-0.5V) to the voltage comparator module, the voltage comparator module outputs a high level when setting an input voltage threshold value greater than 1V and outputs a low level when setting an input voltage threshold value less than 1V, so that the voltage comparator outputs a low level, the voltage comparator outputs a low level and directly enables the PNP triode to drive the two relay contacts, wherein the two relays are closed by default and are opened, thereby achieving the purpose of protecting the trunk line RS485 and simultaneously driving the warning lamp to flash by the PNP triode. The power module gets electricity from the alternating current 220V end of the ammeter and converts the electricity into a direct current 5V power supply, namely the 220V is converted into 5V voltage stabilization as shown in the figure, and the voltage stabilization is used by each module power supply. The figure shows the abbreviation used for the user meter AB, i.e. the user meter AB typeface.
In fig. 1 and 2: + 5V: represents +5V of power; -5V: represents power-5V; GND: representing the power ground.
The following pin numbers are described according to the languages commonly used in the industry, such as pin 1, i.e., the first pin, and pin 2, i.e., the second pin, for space saving, not to be listed; the chip numbers are also described in accordance with the languages customary in the industry, such as U3, i.e., the third chip, and U5.1, i.e., the fifth chip. The user meter interface in the figure is the user meter interface. The user meter is short for the user electric meter.
U3 third chip: the instrument operational amplifier is used for amplifying input differential signals; wherein pin 2, i.e., the second pin, and pin 3, i.e., the third pin, are input differential signal pins, and pin 6, i.e., the sixth pin, is an output signal pin; the pin 1, namely the first pin, and the pin 8, namely the eighth pin, are amplification pins, and the series resistor can amplify output voltage; the pin 5, i.e., the fifth pin, is the input reference voltage pin, so that the pin 6, i.e., the sixth pin, outputs more accurately. R7 is seventh resistance: the value is 49.9 K.OMEGA./1%, and is connected in series at pin 1 and pin 3 of U3, so that U3 amplifies the output voltage. R12 is the first diode: the value of 1K Ω reduces the signal current output at pin 6 of U3 and reduces interference. U5 is referred to as the fifth chip: a dual operational amplifier (U5.1, i.e., a fifth first chip, and U5.2, i.e., a fifth second chip); u5.2, namely the fifth chip, forms a voltage follower to enhance the driving capability of the output voltage of the pin 6 of U3 and reduce interference; u5.1, the fifth chip, constitutes pin 5 of the voltage follower connection U3. R8 eighth resistor, R9 ninth resistor: the value is 1K omega, the serial node of R8 and R9 is 0V and is connected with the pin 5 of U5.1 to form a zero regulator, so that the voltage of the pin 5 of U3 is 0V. R14, i.e., a first fourth resistor, R13, i.e., a first third resistor: the node voltage of the series connection of R14 and R13 is 1V with the values of 39K omega and 10K omega. U6 is referred to as the sixth chip: the voltage comparator only uses one voltage comparator U6.1, namely a sixth chip, a pin 3 of the U6.1, namely a third pin of the sixth chip, is a positive phase input end, a pin 2, namely a second pin of the sixth chip, is an inverted phase input end, and the output voltages of the pins 1 and 2 of the U5.2 are compared; pin 1 of U6.1 is the output terminal; the node voltage of the series connection of R14 and R13 is connected with the inverting input/output end of the pin 2 of U6.1, so that the inverting input end of the pin 2 of U6.1 is 1V; when the voltage of the pin 3 of the U6.1 is greater than the voltage of the pin 2 of the U6.1, the pin 1 of the U6.1 outputs a high level (not less than 1.5V and not more than 3.9V); when the voltage of pin 3 of U6.1 is less than the voltage of pin 2 of U6.1, pin 1 of U6.1 outputs a low level (not more than 3.9V). R16 is the first sixth resistor; with a value of 4.7K omega, a voltage of 5V is pulled up, keeping transistor Q2 in an off state. R15 is the first five resistances: a value of 3.6K omega, reduces the effect of the current. Q2 is PNP triode with model number of 2N3904, and is manufactured by Anson; the function is to control the RELAY2, i.e. the power switch of the two-way RELAY. RELAY 2: two-way relay, model HFD4/5-S, factory building door macro-switch equipment; pin 1 and pin 8 are coils; the pin 4, the pin 5 and the pin 6 are one path of relay, and the pin 2, the pin 3 and the pin 4 are a second path of relay; pins 4 and 5 of the schematic diagram are not used; pin 6 and pin 7 are closed by default, and pin 2 and pin 3 are closed by default. According to the working principle, when the Q2 triode is switched on, the pin 1 and the pin 8 of the RELAY2 are powered on, then the pin 6 and the pin 7 are disconnected, and the pin 2 and the pin 3 are disconnected, so that the trunk line A, the trunk line B and a user electric meter are disconnected. The LED indicates a red light, and the transistor Q2 lights when turned on. R17 first seventh resistance: the value is 1K Ω, reducing the current.
It should be noted that the above embodiments are only preferred embodiments of the present invention and the technical principles applied, and any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a real-time supervision circuit of user's ammeter line condition which characterized in that: the real-time monitoring circuit for the line condition of the user electric meter comprises a user electric meter line for connecting the user electric meter, a differential amplifier module, a voltage comparator module, a PNP triode circuit and a warning device,
the differential amplifier module comprises a differential amplification processing unit, a single-ended signal isolation output unit and an output single-ended signal zero setting circuit, the output single-ended signal zero setting circuit is in circuit connection with the differential amplification processing unit and is used for output direct-current signal zero setting of the differential amplifier module, the differential amplification processing unit comprises a third chip, the third chip is a differential amplifier and mainly comprises an operational amplifier, and the third chip is provided with an input differential signal pin and an output signal pin; the single-ended signal isolation output unit comprises a fifth second chip, the fifth second chip is a voltage follower, the fifth second chip is provided with a positive input end, a negative input end and an output end, the output end of the fifth second chip is connected with the negative input end of the fifth second chip to form an isolated signal output end, the voltage comparator module comprises a sixth chip, a first fourth resistor and a first third resistor which are connected in series, the sixth chip is a voltage comparator, the sixth chip is provided with a third pin which is a positive input end, a second pin which is a reverse input end and a first pin which is an output end, a series node of the first fourth resistor and the first third resistor is connected with the second pin of the sixth chip, the node voltage of the series node of the first fourth resistor and the first third resistor is 1V, and the PNP triode circuit comprises a PNP triode,
an input differential signal pin of a third chip of the differential amplification processing unit is connected with a line of a user electric meter, an output signal pin of the third chip of the differential amplification processing unit is connected with a positive input end of a fifth second chip of the single-ended signal isolation output unit through a first diode and a second resistor, an isolated signal output end of the fifth second chip of the single-ended signal isolation output unit is connected with a positive input end of a sixth chip of the voltage comparator module, an output end of the sixth chip is connected with a PNP triode in a circuit mode, an emitting electrode of the PNP triode is connected with a warning device in a circuit mode, the differential amplification processing unit detects two ends of the user electric meter, when the two ends of the user electric meter are not short-circuited, voltage is generated, the differential amplification processing unit amplifies the voltage at the two ends of the user electric meter to the maximum 3.7V to the voltage comparator module, and when the voltage comparator module detects that the input voltage is greater than, the PNP triode is not driven, and the warning device is not driven; when two ends of a user electric meter are short-circuited and the differential amplification processing unit detects that two ends of the user electric meter are short-circuited, two ends of the differential amplification processing unit are also short-circuited, at the moment, the differential amplification processing unit directly outputs a low level to the voltage comparator module, the voltage comparator module sets that an input voltage threshold value is greater than 1V and outputs a high level, and when the input voltage threshold value is less than 1V, the voltage comparator module outputs a low level, and the voltage comparator module outputs a low level and directly makes the PNP triode drive warning device give an alarm.
2. The circuit for real-time monitoring of line conditions of a consumer meter of claim 1, wherein: the warning device is an LED warning lamp.
3. The circuit for real-time monitoring of line conditions of a consumer meter of claim 1, wherein: the third chip is provided with a second pin and a third pin to form the input differential signal pin, a sixth pin to form the output signal pin, a first pin and an eighth pin to form the amplification signal pin, a seventh resistor is connected in series between the first pin and the eighth pin and used for amplifying output voltage, the seventh resistor is used for adjusting amplification factor, and a fifth pin to form the input reference voltage pin, so that the output of the sixth pin is more accurate.
4. The circuit of claim 3, wherein the circuitry is configured to monitor the line condition of the consumer meter in real time: the differential amplification processing unit further comprises an output single-ended signal zero setting circuit, the output single-ended signal zero setting circuit comprises a fifth chip, the fifth chip is a voltage follower and is used for connecting a fifth pin of the third chip, the positive input end of the fifth chip is connected with an eighth resistor and a ninth resistor, one end of the eighth resistor is connected with a positive voltage, the other end of the eighth resistor is connected with one end of the ninth resistor and is connected with the positive input end of the fifth chip together, one end of the ninth resistor is connected with a negative voltage, the eighth resistor and the ninth resistor are connected in series with a node which is 0V to form the zero setting device, and the voltage of the fifth pin of the third chip is 0V.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117330828A (en) * | 2023-09-27 | 2024-01-02 | 怀化建南机器厂有限公司 | Electric energy meter with client short-circuit protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117330828A (en) * | 2023-09-27 | 2024-01-02 | 怀化建南机器厂有限公司 | Electric energy meter with client short-circuit protection function |
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