CN219496522U - Three-phase intelligent ammeter of wiring mode self-adaptation - Google Patents
Three-phase intelligent ammeter of wiring mode self-adaptation Download PDFInfo
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- CN219496522U CN219496522U CN202320867068.4U CN202320867068U CN219496522U CN 219496522 U CN219496522 U CN 219496522U CN 202320867068 U CN202320867068 U CN 202320867068U CN 219496522 U CN219496522 U CN 219496522U
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Abstract
The utility model discloses a wiring mode self-adaptive three-phase intelligent electric energy meter, which comprises a wiring switching module, wherein the wiring switching module comprises a magnetic latching relay, a common contact of the magnetic latching relay is connected with a B-phase voltage acquisition end of the electric energy meter, a normally closed contact is suspended, and a normally open contact is connected with an N line; the second coil terminal of the magnetic latching relay is connected with a first power supply end, the first coil terminal is connected with an output collector of the optocoupler E2, an output emitter of the optocoupler E2 is grounded through a resistor R38, an input positive electrode of the optocoupler E2 is connected with a system power supply end VSYS, and an input negative electrode of the optocoupler E2 is connected with a control output end of the MCU. According to the utility model, the self-adaptive switching of the wiring mode is realized through the MCU and the wiring switching module, so that the electric energy meter meets the metering requirements of different voltage specifications and different wiring modes on the electricity utilization site, and the classified storage and management cost of the electric energy meter is reduced.
Description
Technical Field
The utility model relates to the technical field of electric energy meters, in particular to a wiring mode self-adaptive three-phase intelligent electric energy meter.
Background
The intelligent ammeter is used as one of key terminal products for intelligent power grid construction, and the domestic permeability is more than 90%. The popularization and application of the intelligent electric meter relate to the stable operation of the intelligent electric network and the electricity utilization experience of industrial and civil users. According to different load types, three-phase intelligent electric meters are generally divided into two metering modes: high-voltage metering connected through a voltage transformer and low-voltage metering directly connected through the voltage transformer. The low-voltage metering voltage specifications are 3X57.7/100V and 3X100V, wherein 3X57.7/100V is a three-phase four-wire wiring mode, and 3X100V is a three-phase three-wire wiring mode. The high-voltage metering voltage specification is 3X220/380V, and the three-phase four-wire wiring mode is adopted. The existing electric energy meter only meets the measurement of a single wiring mode, and in order to meet the measurement requirements of different voltage specifications and different wiring modes on a power utilization site, the electric energy meter with different specifications is required to be provided, and the classified storage and management cost of the electric energy meter is high.
Disclosure of Invention
The utility model provides a wiring mode self-adaptive three-phase intelligent electric energy meter, which aims to: the wiring mode self-adaptive switching of the electric energy meter is realized, so that the electric energy meter meets the metering requirements of different voltage specifications and different wiring modes on the electricity utilization site, and the classified storage and management cost of the electric energy meter is reduced.
The technical scheme of the utility model is as follows:
the three-phase intelligent electric energy meter with the self-adaptive wiring mode comprises a three-phase voltage acquisition circuit, a three-phase current acquisition circuit, a metering chip, an MCU and a wiring switching module, wherein a three-phase voltage acquisition end of the electric energy meter is connected with the metering chip through the three-phase voltage acquisition circuit, a three-phase current acquisition end of the electric energy meter is connected with the metering chip through the three-phase current acquisition circuit, and the metering chip is connected with the MCU;
the wiring switching module comprises a magnetic latching relay K1, wherein a public contact of the magnetic latching relay K1 is connected with a B-phase voltage acquisition end of the electric energy meter, a normally closed contact of the magnetic latching relay K1 is suspended, and a normally open contact of the magnetic latching relay K1 is connected with an N line; the second coil terminal of the magnetic latching relay K1 is connected with a first power end ISO12V, and the first power end ISO12V is grounded through a capacitor C54 and an electrolytic capacitor C81 which are connected in parallel; a diode V26 is connected between the first coil terminal and the second coil terminal of the magnetic latching relay K1, and the current conduction direction of the diode V26 is from the first coil terminal to the second coil terminal; the first coil terminal of the magnetic latching relay K1 is connected with the collector of the output end of the optocoupler E2, the emitter of the output end of the optocoupler E2 is grounded through a resistor R38, the positive electrode of the input end of the optocoupler E2 is connected with the system power supply end VSYS, and the negative electrode of the input end of the optocoupler E2 is connected with the control output end RLY_CK of the MCU.
Further, a self-locking key SW1 is arranged between the negative electrode of the input end of the optocoupler E2 and the control output end rly_ck of the MCU.
Further, the electric energy meter further comprises a power management module, the power management module is used for supplying power to the metering chip and the MCU, the power management module comprises a rectification filter circuit and a power supply circuit, the input end of the rectification filter circuit is connected with the three-phase voltage acquisition end of the electric energy meter, the output end of the rectification filter circuit is connected with the input end of the power supply circuit, and the first power end ISO12V is used as the output end of the power supply circuit.
Further, the rectifying and filtering circuit comprises a rectifying bridge, a first filtering network and a second filtering network, wherein the three-phase input end of the rectifying bridge is connected with the three-phase voltage acquisition end of the electric energy meter through a thermistor R7, a thermistor R16 and a thermistor R24 respectively, and the three-phase voltage acquisition end of the electric energy meter is connected with an N line through a piezoresistor RV1, a piezoresistor RV2 and a piezoresistor RV3 respectively; the output end of the rectifier bridge is connected with the input end of the second filter network through the first filter network, the output end of the second filter network is connected with the output end of the rectifier filter circuit, and the output end of the second filter network is grounded through the electrolytic capacitor C16 and the electrolytic capacitor C17 in sequence.
Further, the power supply circuit comprises a transformer T1 and a DC-DC chip, a first primary coil of the transformer T1 is connected with the input end of the power supply circuit, a second primary coil of the transformer T1 is connected with a voltage end VDD of the DC-DC chip and used for triggering the DC-DC chip to work, and a secondary coil of the transformer T1 is connected with the output end of the power supply circuit;
the output end of the power supply circuit is connected with the feedback end COMP of the DC-DC chip through the feedback circuit, and the power supply circuit is used for enabling the DC-DC chip to control the duty ratio according to the feedback voltage and the sampling voltage.
Further, the feedback circuit comprises a three-terminal adjustable shunt reference voltage source V25, the anode of the three-terminal adjustable shunt reference voltage source V25 is grounded, the cathode of the three-terminal adjustable shunt reference voltage source V25 is connected with a first connecting point, the reference end of the three-terminal adjustable shunt reference voltage source V25 is connected with a second connecting point, the second connecting point is grounded through a resistor R36, and the second connecting point is also connected with the first power end through a resistor R29; the first connecting point is connected with the second connecting point through a capacitor C21, and the first connecting point is also connected with the second connecting point through a resistor R32 and a capacitor C19 in sequence; the first connecting point is connected with the first power supply end sequentially through a resistor R27, a resistor R23 and an inductor L1, two ends of the resistor R27 are respectively connected with the positive electrode of the input end and the negative electrode of the input end of the optocoupler E1, the emitting electrode of the output end of the optocoupler E1 is grounded, the collecting electrode of the output end of the optocoupler E1 is connected with the feedback end COMP of the DC-DC chip through a resistor R31, and the feedback end COMP of the DC-DC chip is grounded through a capacitor C20.
Further, the first primary coil of the transformer T1 is connected to the input end of the power supply circuit through an RCD circuit, the RCD circuit includes a resistor R3, a resistor R6, a capacitor C2, and a diode V4, the resistor R3 and the resistor R6 are connected in series and then connected in parallel to two ends of the capacitor C2, one end of the capacitor C2 is connected to the input end of the power supply circuit and the first terminal of the first primary coil of the transformer T1, the other end of the capacitor C2 is connected to the cathode of the diode V4, and the anode of the diode V4 is connected to the second terminal of the first primary coil of the transformer T1.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The self-adaptive switching of the wiring mode is realized through the MCU and the wiring switching module, so that the electric energy meter meets the metering requirements of different voltage specifications and different wiring modes on the electricity utilization site, and the classified storage and management cost of the electric energy meter is reduced;
(2) A self-locking key is added between the control output end of the MCU and the magnetic latching relay, and the self-adaptive switching function can be realized by opening or closing a wiring mode through the self-locking key, so that the use is flexible and convenient;
(3) The power management module adopts a switching power supply design, realizes wide-range voltage signal input and voltage stabilization output through feedback circuit adjustment, has low power consumption, high efficiency and wide voltage stabilization range, and can still ensure stable output voltage when the voltage of the power frequency power grid changes greatly.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a circuit block diagram of a patch cord switching module;
FIG. 3 is a circuit block diagram of a power management module;
FIG. 4 is a block diagram of a rectifying and filtering circuit;
fig. 5 is a block diagram of a power supply circuit.
Detailed Description
The technical scheme of the utility model is described in detail below with reference to the accompanying drawings:
referring to fig. 1, a three-phase intelligent electric energy meter with self-adaptive wiring mode comprises a three-phase voltage acquisition circuit 6, a three-phase current acquisition circuit 1, a metering chip 2, an MCU4 and a wiring switching module 5, wherein a three-phase voltage acquisition end of the electric energy meter is connected with the metering chip 2 through the three-phase voltage acquisition circuit 6, a three-phase current acquisition end of the electric energy meter is connected with the metering chip 2 through the three-phase current acquisition circuit 1, and the metering chip 2 is connected with the MCU 4. The MCU4 is of the type HT6025, and the metering chip 2 is of the type ATT7022.
As shown in fig. 2, the wiring switching module 5 comprises a magnetic latching relay K1, wherein a common contact of the magnetic latching relay K1 is connected with a B-phase voltage acquisition end of the electric energy meter, a normally closed contact of the magnetic latching relay K1 is suspended, and a normally open contact of the magnetic latching relay K1 is connected with an N line; the second coil terminal of the magnetic latching relay K1 is connected with a first power end ISO12V, and the first power end ISO12V is grounded through a capacitor C54 and an electrolytic capacitor C81 which are connected in parallel; a diode V26 is connected between the first coil terminal and the second coil terminal of the magnetic latching relay K1, and the current conduction direction of the diode V26 is from the first coil terminal to the second coil terminal; the first coil terminal of the magnetic latching relay K1 is connected with the collector of the output end of the optocoupler E2, the emitter of the output end of the optocoupler E2 is grounded through a resistor R38, the positive electrode of the input end of the optocoupler E2 is connected with the system power supply end VSYS, and the negative electrode of the input end of the optocoupler E2 is connected with the control output end RLY_CK of the MCU 4.
The magnetic latching relay K1 is used for controlling the short circuit between B and N and is a key device for realizing self-adaptive switching; v26 is used for cutting off reverse pulse voltage generated by instant conduction of the relay; c81 and C54 are used for providing driving capability for controlling the magnetic latching relay K1; the optocoupler E2 ensures that the magnetic latching relay K1 is isolated from the MCU control pin.
The working principle of the wiring switching module 5 is as follows: the electric energy meter circuit defaults to a 3P4W three-phase four-wire wiring mode, and the MCU4 judges whether the current wiring mode is a 3P4W three-phase four-wire wiring mode or a 3P3W three-phase three-wire wiring mode according to ABC three-phase voltage. If the wiring is 3P3W, MCU4 sends control signal through RLY_CK, optocoupler E2 switches on, magnetic latching relay K1 coil gets the electricity, and magnetic latching relay K1's normally open contact is closed to make the inside B phase voltage acquisition end of electric energy meter short circuit with N line, the electric energy meter wiring mode switches over to 3P3W.
Preferably, a self-locking key SW1 is arranged between the negative electrode of the input end of the optocoupler E2 and the control output end rliy_ck of the MCU 4. A self-locking key is added between a control output end RLY_CK of the MCU4 and the magnetic latching relay K1, the self-adaptive switching can be performed only by pressing the key, and if the switching is not needed, the key is not needed to be pressed, so that the use is flexible and convenient.
As shown in fig. 3, the three-phase intelligent electric energy meter further comprises a power management module 3, the power management module 3 is used for supplying power to the metering chip 2 and the MCU4, the power management module 3 comprises a rectifying and filtering circuit 3-1 and a power supply circuit 3-2, an input end of the rectifying and filtering circuit 3-1 is connected with a three-phase voltage acquisition end of the electric energy meter, an output end of the rectifying and filtering circuit 3-1 is connected with an input end of the power supply circuit 3-2, and a first power end ISO12V is used as an output end of the power supply circuit 3-2.
As shown in fig. 4, the rectifying and filtering circuit 3-1 includes a rectifying bridge, a first filtering network 3-1-1 and a second filtering network 3-1-2, wherein three-phase input ends of the rectifying bridge are respectively connected with three-phase voltage acquisition ends of the electric energy meter through a thermistor R7, a thermistor R16 and a thermistor R24, and the three-phase voltage acquisition ends of the electric energy meter are respectively connected with an N line through a piezoresistor RV1, a piezoresistor RV2 and a piezoresistor RV 3. The piezoresistor and the thermistor are used for a front-stage protection circuit to protect the overvoltage and overcurrent conditions of the input end. The output end of the rectifier bridge is connected with the input end of the second filter network 3-1-2 through the first filter network 3-1-1, specifically, the first filter network 3-1-1 comprises a safety capacitor C14 and a common mode inductance L2, the safety capacitor C14 is connected between the positive output end and the negative output end of the rectifier bridge, and the common mode inductance L2 is connected in parallel at two ends of the safety capacitor C14. The safety capacitor is used for inhibiting differential mode interference and has the functions of power supply filtering and energy storage, and the common mode inductor is used for inhibiting common mode interference. The output end of the second filter network 3-1-2 is connected with the output end of the rectifying filter circuit 3-1, and the output end of the second filter network 3-1-2 is grounded through the electrolytic capacitor C16 and the electrolytic capacitor C17 in sequence. The rectifying and filtering circuit 3-1 converts an alternating voltage into a direct voltage. Specifically, the first filter network 3-1-1 is used for suppressing external signal interference, and the second filter network 3-1-2 is used for converting pulsating direct current voltage into smooth direct current voltage, wherein the model of the current limiting protection chip D2 is DMHV-1400-B.
As shown in fig. 5, the power supply circuit 3-2 includes a transformer T1 and a DC-DC chip, a first primary winding of the transformer T1 is connected to an input terminal of the power supply circuit 3-2, the first primary winding of the transformer T1 is further connected to a switch output terminal SW of the DC-DC chip, a second primary winding of the transformer T1 is connected to one end of a resistor R33 sequentially through a diode V11 and a resistor R21, one end of the resistor R33 is grounded through a capacitor C23, the other end of the resistor R33 is connected to a voltage terminal VDD of the DC-DC chip for triggering the DC-DC chip to operate, and the secondary winding of the transformer T1 is connected to an output terminal of the power supply circuit 3-2 through a capacitor C22; the output end of the power supply circuit 3-2 is connected with the feedback end COMP of the DC-DC chip through the feedback circuit 3-2-2, the acquisition end CS of the DC-DC chip is grounded through a resistor R34 and a resistor R35 which are connected in parallel, and the DC-DC chip controls the duty ratio according to the feedback voltage and the sampling voltage, so that wide-range voltage input and stable voltage output are realized. The DC-DC chip is 8234T.
Preferably, the feedback circuit 3-2-2 includes a three-terminal adjustable shunt reference voltage source V25, an anode of the three-terminal adjustable shunt reference voltage source V25 is grounded, a cathode of the three-terminal adjustable shunt reference voltage source V25 is connected to a first connection point, a reference end of the three-terminal adjustable shunt reference voltage source V25 is connected to a second connection point, the second connection point is grounded through a resistor R36, and the second connection point is also connected to the first power supply end through a resistor R29; the first connecting point is connected with the second connecting point through a capacitor C21, and the first connecting point is also connected with the second connecting point through a resistor R32 and a capacitor C19 in sequence; the first connecting point is connected with the first power supply end sequentially through a resistor R27, a resistor R23 and an inductor L1, two ends of the resistor R27 are respectively connected with the positive electrode of the input end and the negative electrode of the input end of the optocoupler E1, the emitting electrode of the output end of the optocoupler E1 is grounded, the collecting electrode of the output end of the optocoupler E1 is connected with the feedback end COMP of the DC-DC chip through a resistor R31, and the feedback end COMP of the DC-DC chip is grounded through a capacitor C20. The resistor R29, the resistor R36, the optocoupler E1 and the three-terminal adjustable shunt reference voltage source V25 form a control network to monitor output voltage, and control signals are fed back to COMP; resistor R23 and resistor R27 provide control loop dc gain and resistor R32 and capacitor C19 provide loop compensation. The three-terminal adjustable shunt reference voltage source V25 is model TL431.
When the input voltage is in a low range, the output voltage of the rectifying and filtering circuit 3-1 is reduced, the primary side voltage of the transformer T1 is reduced, but the power supply voltage range of the DC-DC chip is met, the DC-DC chip can be started normally, but the voltage of the secondary side of the transformer T1 is reduced, the actual design requirement is not met, at the moment, the feedback circuit 3-2-2 feeds back a signal to the COMP pin of the DC-DC chip, the duty ratio of the system is increased, and the power supply can be started normally; when the input voltage is in a high range, the output voltage of the rectifying and filtering circuit 3-1 is increased, the primary side voltage of the transformer T1 is increased, DC-DC is started normally at the moment, and at the moment, the feedback circuit 3-2-2 feeds back signals to the COMP pin of the DC-DC chip due to the increase of the secondary side voltage of the transformer T1, so that the duty ratio of the system is reduced, the power supply can be started normally, and therefore, wide-range voltage input and stable voltage output are realized.
Further preferably, the first primary winding of the transformer T1 is connected to the input terminal of the power supply circuit 3-2 through the RCD circuit 3-2-1, the RCD circuit 3-2-1 includes a resistor R3, a resistor R6, a capacitor C2, and a diode V4, the resistor R3 and the resistor R6 are connected in series and then connected to two ends of the capacitor C2 in parallel, one end of the capacitor C2 is connected to the input terminal of the power supply circuit 3-2 and the first terminal (6 pins) of the first primary winding of the transformer T1, the other end of the capacitor C2 is connected to the cathode of the diode V4, and the anode of the diode V4 is connected to the second terminal (4 pins) of the first primary winding of the transformer T1. The RCD circuit is used for suppressing Vds spike voltage.
The scope of the present utility model includes, but is not limited to, the above embodiments, and any conceivable alternatives, modifications, and improvements made to the present technology fall within the scope of the present utility model.
Claims (7)
1. A three-phase intelligent ammeter of wiring mode self-adaptation, its characterized in that: the three-phase voltage acquisition circuit (6), the three-phase current acquisition circuit (1), the metering chip (2), the MCU (4) and the wiring switching module (5), wherein a three-phase voltage acquisition end of the electric energy meter is connected with the metering chip (2) through the three-phase voltage acquisition circuit (6), a three-phase current acquisition end of the electric energy meter is connected with the metering chip (2) through the three-phase current acquisition circuit (1), and the metering chip (2) is connected with the MCU (4);
the wiring switching module (5) comprises a magnetic latching relay K1, wherein a public contact of the magnetic latching relay K1 is connected with a B-phase voltage acquisition end of the electric energy meter, a normally closed contact of the magnetic latching relay K1 is suspended, and a normally open contact of the magnetic latching relay K1 is connected with an N line; the second coil terminal of the magnetic latching relay K1 is connected with a first power end ISO12V, and the first power end ISO12V is grounded through a capacitor C54 and an electrolytic capacitor C81 which are connected in parallel; a diode V26 is connected between the first coil terminal and the second coil terminal of the magnetic latching relay K1, and the current conduction direction of the diode V26 is from the first coil terminal to the second coil terminal; the first coil terminal of the magnetic latching relay K1 is connected with the collector of the output end of the optocoupler E2, the emitter of the output end of the optocoupler E2 is grounded through a resistor R38, the positive electrode of the input end of the optocoupler E2 is connected with the system power supply end VSYS, and the negative electrode of the input end of the optocoupler E2 is connected with the control output end RLY_CK of the MCU (4).
2. The wiring-mode-adaptive three-phase intelligent ammeter according to claim 1, wherein: a self-locking key SW1 is arranged between the negative electrode of the input end of the optocoupler E2 and the control output end RLY_CK of the MCU (4).
3. The wiring-mode-adaptive three-phase intelligent ammeter according to claim 1, wherein: the power supply device is characterized by further comprising a power supply management module (3), wherein the power supply management module (3) is used for supplying power to the metering chip (2) and the MCU (4), the power supply management module (3) comprises a rectification filter circuit (3-1) and a power supply circuit (3-2), the input end of the rectification filter circuit (3-1) is connected with the three-phase voltage acquisition end of the electric energy meter, the output end of the rectification filter circuit (3-1) is connected with the input end of the power supply circuit (3-2), and the first power supply end ISO12V is used as the output end of the power supply circuit (3-2).
4. A wiring-mode-adaptive three-phase intelligent ammeter according to claim 3, wherein: the rectification filter circuit (3-1) comprises a rectification bridge, a first filter network (3-1-1) and a second filter network (3-1-2), wherein the three-phase input end of the rectification bridge is connected with the three-phase voltage acquisition end of the electric energy meter through a thermistor R7, a thermistor R16 and a thermistor R24 respectively, and the three-phase voltage acquisition end of the electric energy meter is connected with an N line through a piezoresistor RV1, a piezoresistor RV2 and a piezoresistor RV3 respectively; the output end of the rectifier bridge is connected with the input end of the second filter network (3-1-2) through the first filter network (3-1-1), the output end of the second filter network (3-1-2) is connected with the output end of the rectifier filter circuit (3-1), and the output end of the second filter network (3-1-2) is grounded through an electrolytic capacitor C16 and an electrolytic capacitor C17 in sequence.
5. A wiring-mode-adaptive three-phase intelligent ammeter according to claim 3, wherein: the power supply circuit (3-2) comprises a transformer T1 and a DC-DC chip, a first primary coil of the transformer T1 is connected with the input end of the power supply circuit (3-2), a second primary coil of the transformer T1 is connected with a voltage end VDD of the DC-DC chip and used for triggering the DC-DC chip to work, and a secondary coil of the transformer T1 is connected with the output end of the power supply circuit (3-2);
the output end of the power supply circuit (3-2) is connected with the feedback end COMP of the DC-DC chip through the feedback circuit (3-2-2) and is used for enabling the DC-DC chip to control the duty ratio according to the feedback voltage and the sampling voltage.
6. The wiring-mode-adaptive three-phase intelligent ammeter according to claim 5, wherein: the feedback circuit (3-2-2) comprises a three-terminal adjustable shunt reference voltage source V25, wherein the anode of the three-terminal adjustable shunt reference voltage source V25 is grounded, the cathode of the three-terminal adjustable shunt reference voltage source V25 is connected with a first connecting point, the reference end of the three-terminal adjustable shunt reference voltage source V25 is connected with a second connecting point, the second connecting point is grounded through a resistor R36, and the second connecting point is also connected with the first power end through a resistor R29; the first connecting point is connected with the second connecting point through a capacitor C21, and the first connecting point is also connected with the second connecting point through a resistor R32 and a capacitor C19 in sequence; the first connecting point is connected with the first power supply end sequentially through a resistor R27, a resistor R23 and an inductor L1, two ends of the resistor R27 are respectively connected with the positive electrode of the input end and the negative electrode of the input end of the optocoupler E1, the emitting electrode of the output end of the optocoupler E1 is grounded, the collecting electrode of the output end of the optocoupler E1 is connected with the feedback end COMP of the DC-DC chip through a resistor R31, and the feedback end COMP of the DC-DC chip is grounded through a capacitor C20.
7. The wiring-mode-adaptive three-phase intelligent ammeter according to claim 5, wherein: the first primary coil of the transformer T1 is connected with the input end of the power supply circuit (3-2) through an RCD circuit (3-2-1), the RCD circuit comprises a resistor R3, a resistor R6, a capacitor C2 and a diode V4, the resistor R3 and the resistor R6 are connected in series and then connected with the two ends of the capacitor C2 in parallel, one end of the capacitor C2 is connected with the input end of the power supply circuit and the first terminal of the first primary coil of the transformer T1, the other end of the capacitor C2 is connected with the cathode of the diode V4, and the anode of the diode V4 is connected with the second terminal of the first primary coil of the transformer T1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320867068.4U CN219496522U (en) | 2023-04-18 | 2023-04-18 | Three-phase intelligent ammeter of wiring mode self-adaptation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320867068.4U CN219496522U (en) | 2023-04-18 | 2023-04-18 | Three-phase intelligent ammeter of wiring mode self-adaptation |
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| CN219496522U true CN219496522U (en) | 2023-08-08 |
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