CN211955652U - Power consumption measuring circuit of distribution transformer terminal and distribution transformer terminal - Google Patents
Power consumption measuring circuit of distribution transformer terminal and distribution transformer terminal Download PDFInfo
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- CN211955652U CN211955652U CN202020462032.4U CN202020462032U CN211955652U CN 211955652 U CN211955652 U CN 211955652U CN 202020462032 U CN202020462032 U CN 202020462032U CN 211955652 U CN211955652 U CN 211955652U
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Abstract
The utility model relates to a distribution transformer terminal power consumption measuring circuit and a distribution transformer terminal, which belong to the intelligent technical field of distribution transformer terminals and comprise a voltage power consumption measuring circuit and/or a current power consumption measuring circuit; the voltage power consumption measuring circuit comprises a first measuring chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage; the first metering chip is used for calculating the voltage power consumption of each phase according to the voltage and the phase current of each phase of the three-phase voltage of the acquired distribution transformer terminal; the current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, wherein the second metering chip is used for calculating the current power consumption of each phase according to the collected voltage of each phase of the three-phase current of the distribution and transformation terminal in combination with the applied current, and the problems that the power consumption of the distribution and transformation terminal needs to be repeatedly wired, the precision is poor and the efficiency is low in the power consumption detection process are solved.
Description
Technical Field
The utility model relates to a join in marriage and become terminal consumption measuring circuit and join in marriage and become terminal belongs to and joins in marriage and becomes intelligent technical field in terminal.
Background
The intelligent distribution Transformer Terminal (TTU) is mainly used in a rural power grid intelligent low-voltage distribution box, the terminal adopts a GPRS/CDMA data communication mode, a public GSM mobile communication network is used as a carrier, a field RS485 bus, an infrared ray and other communication modes are used for assisting, a circuit breaker, a residual current leakage action circuit breaker, a reactive compensation switching state, a distribution transformer working condition, a metering electric energy meter and the like in the rural power grid distribution box are used as main control management objects, relevant power utilization information is monitored, power supply and utilization monitoring, control and management are achieved, and the intelligent distribution transformer terminal has multiple functions of remote meter reading, power utilization abnormal information alarming, load management and control and the like. The intelligent monitoring system is the first choice equipment for realizing the modernization of the working condition monitoring and the power utilization management of the distribution transformer in the power enterprise, and is also an important means for realizing the demand side management.
In the key technology research process of the industrialization of intelligent distribution transformer terminal products, the power consumption measurement of an intelligent distribution Transformer Terminal (TTU) is a conventional detection item of a detection item, and a 6-bit and 12-bit detection device is generally adopted according to different manufacturers. The power consumption detection of the existing intelligent distribution Transformer Terminal (TTU) generally comprises two types of voltage power consumption detection and current power consumption detection, an external millivoltmeter and an alternating milliammeter are generally required to test the two indexes respectively, and each phase of current needs to be tested respectively, so that repeated wiring is required during production test; in addition, at the test position of each test, the contact resistance introduces a phase-cause measurement error to the result, so that the measurement result is inaccurate, and the batch production and the inspection efficiency are very low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a join in marriage and become terminal consumption measuring circuit and join in marriage and become terminal to solve and join in marriage and become terminal consumption testing process need repeat wiring, poor, the inefficiency problem of precision.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a distribution transformer terminal power consumption measuring circuit, which comprises a voltage power consumption measuring circuit and/or a current power consumption measuring circuit;
the voltage power consumption measuring circuit comprises a first measuring chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage;
the primary side of the current transformer is connected with a corresponding phase line of the three-phase voltage of the distribution and transformation terminal in a sampling manner, and the secondary side of the current transformer is connected with the first metering chip;
the primary side of the voltage transformer is connected with a corresponding phase circuit of the three-phase voltage of the distribution and transformation terminal through each corresponding first voltage division circuit, and the secondary side of the voltage transformer is connected with the first metering chip;
the first metering chip is used for calculating the voltage power consumption of each phase according to the voltage and the phase current of each phase of the three-phase voltage of the acquired distribution transformer terminal;
the current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, the second voltage division circuit is connected with a corresponding phase circuit of the three-phase current of the distribution and transformation terminal in a sampling mode, and the second voltage division circuit is further connected with the second metering chip;
and the second metering chip is used for calculating the current power consumption of each phase according to the collected electric voltage of each phase of the three-phase current of the distribution and transformation terminal in combination with the applied current.
The utility model discloses a design a distribution transformer terminal consumption measurement circuit, each looks voltage, current information in voltage, the current sensor sampling three-phase voltage through measurement chip and corresponding looks to the calculation obtains the voltage consumption, and/or obtains each phase current in the three-phase current through measurement chip and the bleeder circuit that corresponds looks, thereby calculates and obtains the current consumption that corresponds each phase. Through this consumption measurement circuit, only need once wiring, just can realize the whole detection of the consumption of three-phase, effectively reduced the wiring number of times, simultaneously in the testing process, voltage current information synchronous measurement has effectively reduced consumption measuring error simultaneously, has improved batch production, the efficiency of inspection.
The MCU is connected with the first metering chip and the second metering chip in a sampling mode, controls and connects the enabling ends of the first metering chip and the second metering chip and is used for gating the corresponding metering chips according to test requirements.
Further, the first metering chip and the second metering chip are RN8302B chips, and the secondary side of the current transformer is connected with a current input pin of the first metering chip; the secondary side of the voltage transformer is connected with a voltage input pin of the first metering chip; and the second voltage division circuit is connected with a current input pin of the second metering chip.
And the communication circuit is connected with the MCU and used for uploading the power consumption information acquired by the MCU.
Furthermore, a signal conditioning circuit is further arranged between the first metering chip and the MCU and between the second metering chip and the MCU, and the signal conditioning circuit is a triode amplifying circuit.
Further, the communication circuit is a 485 communication circuit.
The metering power supply circuit comprises a voltage conversion chip, wherein the voltage input end of the voltage conversion chip is connected with a direct-current power supply and is grounded through a voltage stabilizing tube; and the output end of the voltage conversion chip is connected with the first metering chip and the second metering chip.
Furthermore, the second voltage division circuit comprises a plurality of voltage division resistors connected in series, and a clamping diode is connected between the voltage division resistors and the second metering chip.
The utility model also provides a distribution transformer terminal, including the distribution transformer terminal body to and distribution transformer terminal consumption measuring circuit, distribution transformer terminal consumption measuring circuit includes voltage consumption measuring circuit and/or current consumption measuring circuit;
the voltage power consumption measuring circuit comprises a first measuring chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage;
the primary side of the current transformer is connected with a corresponding phase line of the three-phase voltage of the distribution and transformation terminal in a sampling manner, and the secondary side of the current transformer is connected with the first metering chip;
the primary side of the voltage transformer is connected with a corresponding phase circuit of the three-phase voltage of the distribution and transformation terminal through each corresponding first voltage division circuit, and the secondary side of the voltage transformer is connected with the first metering chip;
the first metering chip is used for calculating the voltage power consumption of each phase according to the voltage and the phase current of each phase of the three-phase voltage of the acquired distribution transformer terminal;
the current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, the second voltage division circuit is connected with a corresponding phase circuit of the three-phase current of the distribution and transformation terminal in a sampling mode, and the second voltage division circuit is further connected with the second metering chip;
and the second metering chip is used for calculating the current power consumption of each phase according to the acquired current of each phase of the three-phase current of the distribution and transformation terminal.
The utility model discloses a design a distribution transformer terminal consumption measurement circuit, each phase voltage, current information in voltage, the current sensor sampling three-phase voltage through measurement chip and corresponding looks to the calculation obtains the voltage consumption, and/or obtains each phase voltage combination in the three-phase current through measurement chip and the bleeder circuit of corresponding looks and applys the electric current, thereby calculates the electric current consumption that obtains corresponding each looks. Through this consumption measurement circuit, only need once wiring, just can realize the whole detection of the consumption of three-phase, effectively reduced the wiring number of times, simultaneously in the testing process, voltage current information synchronous measurement has effectively reduced consumption measuring error simultaneously, has improved batch production, the efficiency of inspection.
The MCU is connected with the first metering chip and the second metering chip in a sampling mode, controls and connects the enabling ends of the first metering chip and the second metering chip and is used for gating the corresponding metering chips according to test requirements.
Further, the first metering chip and the second metering chip are RN8302B chips, and the secondary side of the current transformer is connected with a current input pin of the first metering chip; the secondary side of the voltage transformer is connected with a voltage input pin of the first metering chip; and the second voltage division circuit is connected with a current input pin of the second metering chip.
And the communication circuit is connected with the MCU and used for uploading the power consumption information acquired by the MCU.
Furthermore, a signal conditioning circuit is further arranged between the first metering chip and the MCU and between the second metering chip and the MCU, and the signal conditioning circuit is a triode amplifying circuit.
Further, the communication circuit is a 485 communication circuit.
The metering power supply circuit comprises a voltage conversion chip, wherein the voltage input end of the voltage conversion chip is connected with a direct-current power supply and is grounded through a voltage stabilizing tube; and the output end of the voltage conversion chip is connected with the first metering chip and the second metering chip.
Furthermore, the second voltage division circuit comprises a plurality of voltage division resistors connected in series, and a clamping diode is connected between the voltage division resistors and the second metering chip.
Drawings
Fig. 1 is a schematic diagram of a voltage power consumption measuring circuit in embodiment 1 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 2 is a schematic diagram of voltage detection in the voltage power consumption measuring circuit in the embodiment 1 of the power consumption measuring circuit of the distribution transformer terminal of the utility model;
fig. 3 is a schematic diagram of a metering power supply in the embodiment 1 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 4 is a schematic diagram of a current power consumption measuring circuit in embodiment 2 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 5 is a schematic diagram of a power consumption measuring circuit in embodiment 3 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 6 is a schematic diagram of the MCU connection in embodiment 3 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 7 is a schematic diagram of a signal conditioning circuit in embodiment 3 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 8 is a schematic diagram of a 485 communication circuit in the embodiment 3 of the power consumption measuring circuit of the distribution transformer terminal of the present invention;
fig. 9 is a display interface diagram of the upper computer in the embodiment 3 of the power consumption measuring circuit of the distribution transformer terminal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
The features and properties of the present invention are described in further detail below with reference to examples.
Distribution transformer terminal power consumption measurement circuit embodiment 1:
the embodiment provides a power consumption measuring circuit of a distribution transformer terminal, which comprises a voltage power consumption measuring circuit, wherein the voltage power consumption in the embodiment is the active power of three phases of the distribution transformer terminal. The voltage power consumption measuring circuit mainly comprises a first metering chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage. Specifically, as shown in fig. 1, the current measuring device comprises a first metering chip 1U3 and current transformers CT-A, CT-B, CT-C respectively and correspondingly connected with corresponding phase lines of A, B, C three phases.
For mut mutexample, voltage and current detection of a phase line of a voltage phase A and calculation of voltage power consumption are performed, a primary side of a current transformer CT-A is connected with the phase A of the three-phase voltage of the distribution terminal in a sampling mode, and a secondary side of the current transformer CT-A is connected with the first metering chip 1U3, so that collected current information is sent to the first metering chip 1U 3. In order to prevent short circuit of alternating current, thermistors RT 7-RT 9 for preventing short circuit of alternating current 220V are further arranged in the embodiment.
As shown in fig. 2, the primary side of the voltage transformer 1PT-a is connected to the corresponding phase line of the three-phase voltage of the distribution and transformation terminal through the corresponding first voltage dividing circuit, that is, the first interface of the primary side is connected to the phase a uin through the first voltage dividing circuit, the second interface is connected to the neutral point un, and the secondary side of the voltage transformer is connected to the first metering chip 1U 3. The first voltage division circuit is a resistor 1RA 5-1 RA10 which are connected in series. In this embodiment, the secondary side of the voltage transformer is sampled by a sampling resistor 1RA/B/C13 and then connected to the first metering chip. Where uin and Uaout represent the application node locations.
The first metering chip 1U3 calculates voltage power consumption of each phase according to each phase voltage and each phase current of the three-phase voltage of the distribution transformer terminal. In this embodiment, the metering chip is an RN8302B chip, and the secondary side of the current transformer is connected to an IAP pin and an IAN pin, or an IBP pin and an IBN pin, or an ICP pin and an ICN pin of the first metering chip; and the secondary side of the voltage transformer is connected with VAP and VAN pins, or VBP and VBN pins, or VCP and VCN pins of the first metering chip.
The measurement of the phases B and C is the same as the above process, and therefore, the detailed description thereof is omitted. In the embodiment, because the current of the voltage line is small (the upper limit is 200mA), a mutual inductor CT-A/B/C (200mA:2.5mA) can be adopted for sampling, and the secondary side of the mutual inductor is connected to the metering chip after being sampled by sampling resistors 1RA/B/C1 and 1 RA/B/C2. The voltage signal is divided by a resistor 1 RA/B/C5-1 RA/B/C10 and then input into the n mutext stage by an isolation transformer 1 PT-A/B/C. Of course, according to the actual application requirements, other standard transformer types can be selected.
As shown in fig. 3, the present embodiment further provides a metering power supply circuit, where the metering power supply circuit includes a voltage conversion chip, and a voltage input end of the voltage conversion chip is connected to a dc power supply and grounded through a voltage regulator tube; and the output end of the voltage conversion chip is connected with the first metering chip and the second metering chip.
Distribution transformer terminal power consumption measurement circuit embodiment 2:
in this embodiment, a power consumption measuring circuit for measuring current power consumption, that is, apparent power of a distribution transformer terminal is provided, as shown in fig. 4, in this embodiment, the current power consumption measuring circuit includes a second voltage dividing circuit and a second metering chip 2U3, the second voltage dividing circuit is connected to a corresponding phase line of three-phase current of the distribution transformer terminal in a sampling manner, and the second voltage dividing circuit is further connected to the second metering chip 2U 3; the second metering core calculates the current power consumption of each phase according to the collected voltage of each phase of the three-phase current of the distribution terminal in combination with the applied current; the second voltage division circuit is connected with an IAP pin and an IAN pin, or an IBP pin and an IBN pin, or an ICP pin and an ICN pin of the second metering chip. In fig. 4 IA +, IA-denote the voltages across the measured current line, i.e. across the measured current measuring line.
In this embodiment, firstly, the voltage and current channels are the same for the metering chip, and are only different in name to the outside, and the external circuit is required to cooperate to realize the voltage/current measurement function, and are the same for the metering chip (both are connected to the ADC after passing through the amplifying circuit); secondly, the number of voltage measurement paths required for measuring the power consumption of the current path is 4 (A, B, C three-phase and zero sequence), and considering that the voltage path of the metering chip is only 3 paths, the current path is 4 paths; thus, the voltage is designed to be connected to the current pin of the second metering chip during the voltage measurement, but is still essentially the voltage measured across the line. Specifically, taking the channel a as an example, RT3 is used for short-circuit protection, 2RA15, 2RA1, 2RA2 and 2RA16 are used for input divided voltage sampling, 2RA3 and 2CA3, 2RA4 and 2CA4 form a filter circuit, and D1 and D2 play a clamping role; on the sample, the ratio of the input and output voltages is 1: 4.
in this embodiment, the applied current is obtained by communicating with the current generating device through the upper computer, or by communicating with the MCU.
In the embodiment, the voltage of the current loop is small (the upper limit is 2V), and the current loop is connected to a rear-stage metering chip after being subjected to voltage division sampling by adopting resistors of 2RA/B/C1, 2RA/B/C2, 2RA/B/C15 and 2 RA/B/C16.
As a further improvement of the embodiment, if the distribution transformer terminal is not connected to the stage current loop and the stage does not have the epitope automatic short-circuit function, the maximum 6A current of the stage is completely loaded on the voltage dividing resistor of the second voltage dividing circuit at this time, which may cause resistor burnout (or may cause current to stop outputting due to too heavy load), a PTC self-recovery fuse RT3-RT6 is added at the current input port to prevent the 6A signal from being directly connected to the system, the voltage dividing resistor adopts a 3W high-power resistor to prevent the self-recovery fuse from being burnt out in the action process, and simultaneously, the clamping diodes D1-D8 are added at the sampling resistor to protect the pins of the metering chip from being damaged.
Distribution transformer terminal power consumption measurement circuit embodiment 3:
the power consumption measuring circuit of the distribution transformer terminal in embodiment 1 measures the active power of each phase of the distribution transformer terminal, and the power consumption measuring circuit of the distribution transformer terminal in embodiment 2 measures the power of each phase.
The difference between this embodiment and the above-mentioned embodiment 1 and embodiment 2 of the power consumption measurement circuit of the distribution transformer terminal is only that in this embodiment, the circuits in the embodiment 1 and embodiment 2 of the power consumption measurement circuit of the distribution transformer terminal are used to detect the active power and the apparent power.
Therefore, the present embodiment provides a scheme for selecting the metering mode by using the MCU. Specifically, as shown in fig. 5 and 6, in this embodiment, a connection form between the MCU and the power consumption measurement circuit in the power consumption measurement circuit of the distribution terminal in embodiment 1 and the power consumption measurement circuit in the power consumption measurement circuit of the distribution terminal in embodiment 2 is provided. The MCU is connected with the first metering chip and the second metering chip in a sampling mode, the two metering chips are connected in parallel through buses and are controlled to be connected with the enabling ends of the first metering chip and the second metering chip, so that the corresponding metering chips are gated according to test requirements, and switching selection is performed through chip selection pins, so that the independent measurement of the distribution transformer terminal power consumption measuring circuit embodiment 1 and the distribution transformer terminal power consumption measuring circuit embodiment 3 can be realized, and the combined measurement of the distribution transformer terminal power consumption measuring circuit embodiment 3 can also be realized.
As an improvement of this embodiment, as shown in fig. 7, this embodiment further provides a signal conditioning circuit, and the signal conditioning circuit is a triode amplifier circuit. The output ends of the first metering chip and the second metering chip are connected with a control electrode, namely a base electrode, of the triode N2, and the collector electrode of the triode N2 is connected with a direct-current power supply and is also connected with an MCU as an output.
In this embodiment, still be provided with corresponding RS485 communication circuit, realize the communication of MCU and host computer. As shown in fig. 8, the metering chip 1U3 outputs power data to the single chip microcomputer U1 after AD conversion and multiplication of the received voltage signal and current signal. The metering chip 2U3 outputs current data to the single chip microcomputer U1 after AD conversion of the received current signals. The single chip microcomputer U1 transmits the data to the upper computer and the master control of the table body in real time through the communication chip U9 after the data are stored.
Application example:
the following table 1 is the main measurement index measured in this example:
TABLE 1
As shown in the following table 2, the measured power consumption data of the current line is recorded by the current power consumption measuring circuit in the power consumption measuring circuit of the distribution transformer terminal in embodiment 2 under different standard voltages:
TABLE 2
The following table 3 is used for recording voltage data measured by using a voltage transformer in the distribution transformer terminal power consumption measuring circuit 1:
TABLE 3
The following table 4 is a record of current data measured by using a current transformer in the power consumption measurement circuit 1 of the distribution transformer terminal:
TABLE 4
Table 5 below shows the calculated power consumption of the voltage line, i.e., the active power and apparent power data.
TABLE 5
As shown in fig. 9, the measured voltage, current and power data are sent to the upper computer for display after measurement and calculation.
Distribution terminal embodiment:
the embodiment also provides a distribution transformer terminal, which comprises a distribution transformer terminal body, a distribution transformer terminal power consumption measuring circuit and a distribution transformer terminal power consumption measuring circuit
The device comprises a voltage power consumption measuring circuit and/or a current power consumption measuring circuit;
the voltage power consumption measuring circuit comprises a first measuring chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage;
the primary side of the current transformer is connected with a corresponding phase line of the three-phase voltage of the distribution and transformation terminal in a sampling manner, and the secondary side of the current transformer is connected with the first metering chip;
the primary side of the voltage transformer is connected with a corresponding phase circuit of the three-phase voltage of the distribution and transformation terminal through each corresponding first voltage division circuit, and the secondary side of the voltage transformer is connected with the first metering chip;
the first metering chip is used for calculating the voltage power consumption of each phase according to the voltage and the phase current of each phase of the three-phase voltage of the acquired distribution transformer terminal;
the current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, the second voltage division circuit is connected with a corresponding phase circuit of the three-phase current of the distribution and transformation terminal in a sampling mode, and the second voltage division circuit is further connected with the second metering chip;
and the second metering chip is used for calculating the current power consumption of each phase according to the acquired voltage of each phase of the three-phase current of the distribution and transformation terminal and by combining the applied current.
The specific structure of the power consumption measurement circuit of the distribution terminal has been described in detail in embodiments 1, 2, and 3 of the power consumption measurement circuit of the distribution terminal, and thus is not described herein again.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A power consumption measuring circuit of a distribution transformer terminal is characterized by comprising a voltage power consumption measuring circuit and/or a current power consumption measuring circuit;
the voltage power consumption measuring circuit comprises a first measuring chip, a current transformer for measuring each phase of current and a voltage transformer for measuring each phase of voltage;
the primary side of the current transformer is connected with a corresponding phase line of the three-phase voltage of the distribution and transformation terminal in a sampling manner, and the secondary side of the current transformer is connected with the first metering chip;
the primary side of the voltage transformer is connected with a corresponding phase circuit of the three-phase voltage of the distribution and transformation terminal through each corresponding first voltage division circuit, and the secondary side of the voltage transformer is connected with the first metering chip;
the first metering chip is used for calculating the voltage power consumption of each phase according to the voltage and the phase current of each phase of the three-phase voltage of the acquired distribution transformer terminal;
the current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, the second voltage division circuit is connected with a corresponding phase circuit of the three-phase current of the distribution and transformation terminal in a sampling mode, and the second voltage division circuit is further connected with the second metering chip;
and the second metering chip is used for calculating the current power consumption of each phase according to the collected voltage of each phase of the three-phase current of the distribution and transformation terminal in combination with the applied current.
2. The power consumption measurement circuit of the distribution transformer terminal according to claim 1, further comprising an MCU, wherein the MCU is connected to the first metering chip and the second metering chip in a sampling manner, and controls the enable terminals connected to the first metering chip and the second metering chip, so as to gate the corresponding metering chip according to the test requirement.
3. The power consumption measurement circuit of the distribution transformer terminal of claim 1, wherein the first metering chip and the second metering chip are RN8302B chips, and the secondary side of the current transformer is connected with a current input pin of the first metering chip; the secondary side of the voltage transformer is connected with a voltage input pin of the first metering chip; and the second voltage division circuit is connected with a current input pin of the second metering chip.
4. The power consumption measurement circuit of the distribution transformer terminal according to claim 2, further comprising a communication circuit, wherein the communication circuit is connected to the MCU and is configured to upload power consumption information collected by the MCU.
5. The power consumption measurement circuit of the distribution transformer terminal according to claim 1, wherein a signal conditioning circuit is further arranged between the first metering chip and the MCU, and between the second metering chip and the MCU, and the signal conditioning circuit is a triode amplifying circuit.
6. The power consumption measurement circuit of the distribution transformer terminal of claim 4, wherein the communication circuit is a 485 communication circuit.
7. The power consumption measuring circuit of the distribution transformer terminal according to claim 1, further comprising a metering power circuit, wherein the metering power circuit comprises a voltage conversion chip, and a voltage input end of the voltage conversion chip is connected with a direct current power supply and is grounded through a voltage regulator tube; and the output end of the voltage conversion chip is connected with the first metering chip and the second metering chip.
8. The power consumption measurement circuit of the distribution transformer terminal according to claim 1, wherein the second voltage division circuit comprises a plurality of voltage division resistors connected in series, and a clamping diode is further connected between the voltage division resistors and the second metering chip.
9. A distribution terminal, characterized in that it comprises a distribution terminal body and a distribution terminal power consumption measuring circuit according to any of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020462032.4U CN211955652U (en) | 2020-04-01 | 2020-04-01 | Power consumption measuring circuit of distribution transformer terminal and distribution transformer terminal |
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| CN202020462032.4U CN211955652U (en) | 2020-04-01 | 2020-04-01 | Power consumption measuring circuit of distribution transformer terminal and distribution transformer terminal |
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| CN211955652U true CN211955652U (en) | 2020-11-17 |
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