CN216013495U - Electricity inspection appearance with low pressure four ways primary current measurement - Google Patents
Electricity inspection appearance with low pressure four ways primary current measurement Download PDFInfo
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- CN216013495U CN216013495U CN202121887841.0U CN202121887841U CN216013495U CN 216013495 U CN216013495 U CN 216013495U CN 202121887841 U CN202121887841 U CN 202121887841U CN 216013495 U CN216013495 U CN 216013495U
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Abstract
The utility model discloses an electricity utilization inspection instrument with low-voltage four-path primary current measurement. The electricity utilization inspection tester host comprises a three-phase voltage and secondary current input unit, a sampling amplification filter circuit, an ADC (analog to digital converter), a host MCU (micro control unit), a display unit, a touch switch, a communication unit and a host power supply unit; the primary current measuring slave comprises four paths of primary current input units, a sampling amplification filter circuit, an ADC, a slave MCU, a communication unit and a slave power supply unit. The master machine and the slave machine are directly connected by wires, synchronous measurement is carried out by using a clock signal, the master machine measures voltage and secondary side current, and the slave machine carries out primary current synchronous measurement and leakage current calculation; the synchronous measurement and comparison of parameters such as the amplitude, the phase and the total distortion of the primary and secondary currents can be realized, the transformation ratio, the polarity, the phase sequence and the wiring analysis can be carried out, the primary and secondary powers and the electric quantity can be simultaneously calculated, and the comprehensive error check of the metering device can be carried out.
Description
Technical Field
The utility model relates to the field of electricity utilization inspection, in particular to an electricity utilization inspection instrument with low-voltage four-path primary current measurement.
Background
The electricity utilization inspection is closely related to resident electricity utilization, production electricity utilization, office electricity utilization and the like, and is a behavior of ensuring normal power supply of a power enterprise and helping a user to perform safe and economic electricity utilization. The electricity utilization inspection work is very critical, and plays a great role in ensuring the safe electricity utilization of customers and the reasonable recovery of the electricity quantity and the electricity charge.
The electricity utilization inspection is mainly through checking the transformer ratio, checking the wiring of a secondary circuit, checking the error of the electric energy meter to check the metering device, timely correcting and supplementing the electric quantity when finding a problem, timely replacing a fault meter, and ensuring accurate metering. However, the current electricity inspection instrument mostly adopts the method of only measuring secondary voltage and current at the tail of the electric energy meter for judgment, a clear judgment result cannot be obtained when the load type of a user is not clear, the transformation ratio of a mutual inductor in a metering device cannot be checked and checked, the whole error of the metering device cannot be checked, and a method for measuring the leakage current of a low-voltage line is also lacked. Therefore, an electricity inspection tester capable of directly and synchronously measuring primary and secondary multi-path currents is needed in field work, the transformation ratio of a three-phase transformer and the wiring of a secondary circuit can be directly inspected, electricity stealing behaviors of the secondary circuit in modes of phase shifting, shunting, half-wave rectification, harmonic injection and the like can be found, and leakage current in a circuit can also be found.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an electricity utilization tester with low-voltage four-path primary current measurement for improving the functions required in the existing field electricity utilization tester.
The utility model provides the following technical scheme:
the utility model provides an electricity utilization inspection instrument with low-voltage four-path primary current measurement. The electricity utilization inspection tester host comprises three-phase voltages Ua, Ub and Uc, three-phase secondary currents Ia, Ib and Ic input units, a sampling amplification filter circuit, an ADC, a host MCU, a display unit, a touch switch, a communication unit and a host power supply unit; after three-phase voltage and secondary current are input, the three-phase voltage and the secondary current are input into an ADC (analog to digital converter) through a sampling amplification filter circuit, and an analog signal is processed into a digital signal and then processed by a host MCU (microprogrammed control unit); the display unit is directly connected with the host MCU, directly displays the measurement result on a host interface, and can be controlled by the touch switch to display and switch different interfaces; the communication unit is connected with the host computer MCU, and utilizes digital communication to transmit and receive signals of a host computer and a slave computer, the host computer of the electricity inspection instrument transmits a synchronous clock signal to the slave computer, and the slave computer is controlled to carry out synchronous measurement; the power supply unit adopts a built-in lithium battery and an external power supply to supply power to the whole power utilization inspection instrument host system, and meanwhile, the host and the slave are connected through wires to supply power to the slave power supply unit from the host power supply unit. The master MCU realizes voltage and secondary current measurement and communication control of the primary current measurement slave, reads four paths of primary current of the primary current measurement slave, compares the four paths of primary current with the primary and secondary amplitudes, phases, distortion rates and transformation ratio polarities, analyzes the transformation ratio, the polarities and the phase sequence of the primary and secondary currents, uses the analysis result for auxiliary wiring judgment, realizes primary side power and electric quantity calculation, and performs comprehensive error check on the metering device.
The primary current measuring slave of the electricity utilization inspection instrument comprises four paths of primary currents IA, IB, IC and IN input units, a sampling amplification filter circuit, an ADC, a slave MCU, a communication unit and a slave power supply unit. After the master power supply unit powers on the slave power supply unit, the primary current measurement slave starts to synchronously measure the primary side current when receiving the clock synchronization signal of the power utilization inspection instrument master; the four-path primary current input unit processes the acquired primary current through the sampling amplification filter circuit, the sampling filter circuit is connected with the ADC, the ADC converts an analog signal into a digital signal and then processes the digital signal by the MCU, and the communication unit uploads a measurement result to the host machine of the electricity utilization inspection instrument through digital communication.
The utility model has the following beneficial effects:
(1) the utility model adopts wired direct connection between the electricity inspection tester host and the primary current measurement slave, thereby improving the anti-interference capability and the synchronous measurement precision;
(2) the power supply of the secondary machine for primary current measurement of the utility model is directly provided by the power utilization inspection instrument main machine, and the design of the secondary machine is simplified;
(3) in the utility model, the electricity inspection tester host sends a synchronous measurement clock signal to the primary current measurement slave, and the electricity inspection tester host and the primary current measurement slave precisely and synchronously measure primary and secondary currents to obtain a secondary accurate amplitude transformation ratio and a phase relation and calculate primary power and electric quantity;
(4) the utility model can measure the amplitude and phase of A, B, C, N four-path current on the primary side synchronously from the secondary machine, and simultaneously check the measurement result in real time on the electricity inspection tester host, and obtain the current leakage on the primary side through vector calculation;
(5) the utility model discloses the electricity inspection tester host computer is to the voltage of secondary side and the calculation of measuring of electric current, and primary current measurement is followed the synchronous measurement of a secondary current amplitude, phase place, total distortion rate isoparametric and is compared, carries out transformation ratio, polarity and the phase sequence analysis of one, secondary current, carries out the wiring and differentiates, calculates one, secondary power and electric quantity, carries out metering device comprehensive error check-up.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model.
In the drawings:
FIG. 1 is a schematic diagram of the overall system of the present invention;
fig. 2 is a schematic diagram of a three-phase four-wire connection for field applications of the present invention.
Detailed Description
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as meaning either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to fig. 1, the electricity inspection instrument with low-voltage four-path primary current measurement provided by the utility model comprises an electricity inspection instrument host S1 and a primary current measurement slave S2, wherein the electricity inspection instrument host S1 and the primary current measurement slave S2 are in wired connection.
The utility model electricity utilization tester host S1 comprises a three-phase voltage and current input unit 1, a sampling amplification filter circuit 2, an ADC3, a host MCU4, a display unit 5, a touch switch 6, a communication unit 7 and a host power supply unit 8; the three-phase voltage and current input unit 1 is connected with the input end of the sampling amplification filter circuit 2, the output end of the sampling amplification filter circuit 2 is connected with the ADC3 and the host MCU4, the host MCU4 is connected with the display unit 5, the touch switch 6 and the communication unit 7, the touch switch 6 is connected with the display unit 7, and the host power supply unit 8 is connected with the whole system of the electricity utilization inspection tester host S1;
the utility model primary current measurement slave machine S2 comprises a four-way primary current input unit 9, a sampling amplification filter circuit 10, an ADC11, a slave MCU12, a communication unit 13 and a slave power supply unit 14; the four-path primary current input unit 9 is connected with the input end of the sampling amplification filter circuit 10, the output end of the sampling amplification filter circuit 10 is connected with the ADC11 and the slave MCU12, the slave MCU12 is connected with the communication unit 13, and the slave power supply unit 14 is connected with the whole system of the primary current measuring slave;
the utility model discloses three-phase voltage, current input unit 1 includes voltage input Ua1-1, voltage input Ub1-2, voltage input Uc1-3, current input Ia1-4, current input Ib1-5 and current input Ic 1-6; and acquiring data such as amplitude, phase, frequency and the like of three-phase voltages Ua, Ub and Uc and three-phase currents Ia, Ib and Ic of the secondary side A, B, C. The three-phase voltage is directly connected, and the three-phase current is connected through a current clamp;
the utility model discloses four ways primary current input unit 9 includes primary current input IA9-1, primary current input IB9-2, primary current input IC9-3 and primary current input IN 9-4; and acquiring data of four paths of currents UA, UB, UC and UN on the primary side A, B, C, N.
The utility model discloses sampling amplification filter circuit 2 reads the measuring signal in three-phase voltage, 1 secondary circuit of electric current unit, samples, filters, enlargies the processing.
The utility model discloses ADC3 carries out analog-to-digital conversion to the secondary side signal after sampling amplification filter circuit 2 handles, converts analog signal into digital signal.
The utility model discloses host computer MCU4 carries out FFT computational analysis to the three-phase voltage of digital signal' S the secondary side and the amplitude of electric current, the phase place, frequency, power factor etc. power consumption parameter, give synchronous clock signal with electricity inspection tester host computer S1 and give primary current measurement from machine S2, carry out synchronous measurement, read primary side primary current measurement from four ways primary current measurement data of machine S2, once compare simultaneously with secondary amplitude, the phase place, distortion rate and transformation ratio polarity, the transformation ratio of a secondary current is analyzed out, polarity and phase sequence, distinguish the supplementary wiring of analysis result, power, the electric quantity calculation once carries out simultaneously, carry out metering device comprehensive error check.
The utility model discloses display element 5 adopts the true color TFT of high resolution to show, will once side, secondary side measurement, analysis and judgement result with multiple modes such as vector diagram in real time with the screen display show.
Utility model 6 is to display element 5 touch control, controls display element 5 and carries out different interface display and switching.
The utility model discloses communication unit 7 carries out with electric inspection appearance host computer S1 and primary current measurement and communicates from between the machine S2, and with electric inspection appearance host computer S1 and primary current measurement from machine S2 wired connection, primary current measurement is from machine S2 with measured data through digital communication transmission for with electric inspection appearance host computer S1.
The utility model discloses host computer power supply unit 8 comprises built-in lithium cell and external charging source, supplies power for electricity inspection tester host computer S1 and primary current measurement from machine S2 entire system unit.
The utility model discloses four ways primary current input unit 9 is used for gathering primary loop A, B, C, N four ways primary current amplitude, phase data.
The utility model discloses sampling amplification filter circuit 10 samples, enlargies, filtering processing with the primary current amplitude of four ways, phase data of primary loop A, B, C, N who gathers.
The utility model discloses ADC11 carries out analog-to-digital conversion to the signal that once inclines after sampling amplification filter circuit 10 handles, converts analog signal into digital signal.
The utility model discloses from the whole system of machine S2 of machine MCU12 control primary current measurement machine, carry out FFT computational analysis to amplitude, phase place, the frequency of the four ways primary current of the side of digital signal.
Utility model communication unit 13 sends the current measurement once from machine S2 measured data for electricity inspection tester host computer S1, and electricity inspection tester host computer S1 carries out the analysis and calculation.
The utility model is directly supplied with power from the host power supply unit 8 from the slave power supply unit 14, and supplies power to the whole system from the S2 for primary current measurement.
The utility model discloses directly be applied to the on-the-spot low pressure three-phase four-wire mode secondary side that has the mutual-inductor and once side the electrical parameter measurement.
Specifically, with reference to the description shown in fig. 2, the utility model is applied to the field application of the three-phase four-wire connection mode, the device is simply accessed to the electric energy meter, the voltages of the secondary side electric energy meter of the circuit to be measured, namely, the A phase (II), the B phase (III), the C phase (III) and the zero line (III), are sequentially accessed to the A, B, C, N voltage input jack of the electricity inspection tester host S1, and the three-phase voltage is measured; currents Ia, Ib and Ic of the electricity inspection tester host S1 are respectively clamped into a current transformer and secondarily connected to the phase A current, the phase B current and the phase C current of the tail current of the electric energy meter, and three-phase secondary current is measured; the primary side A, B, C, N of the line under test brings the current clamps corresponding to the slaves IA, IB, IC, IN into the primary positions of the current transformers to perform four primary current measurements.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The electricity utilization inspection instrument with the low-voltage four-path primary current measurement is characterized by comprising an electricity utilization inspection instrument host and a primary current measurement slave; the device is suitable for measuring the electricity consumption parameters of a low-voltage three-phase four-wire connection mode with a mutual inductor on site;
the electricity utilization inspection tester host comprises three-phase voltages Ua, Ub and Uc, three-phase secondary currents Ia, Ib and Ic input units, a sampling amplification filter circuit, an ADC, a host MCU, a display unit, a touch switch, a communication unit and a host power supply unit; the three-phase voltages Ua, Ub and Uc and the three-phase secondary currents Ia, Ib and Ic input units are connected with the input end of a sampling amplification filter circuit, the output end of the sampling amplification filter circuit is connected with an ADC and a host MCU, the host MCU is connected with a display unit, a touch switch and a communication unit, the touch switch is connected with the display unit, and a host power supply unit is connected with the whole system of a host of the electricity utilization inspection instrument;
the primary current measuring slave comprises four paths of primary current input units, a sampling amplification filter circuit, an ADC, a slave MCU, a communication unit and a slave power supply unit; the four-path primary current input unit is connected with the input end of the sampling amplification filter circuit, the output end of the sampling amplification filter circuit is connected with the ADC and the slave MCU, the slave MCU is connected with the communication unit, and the slave power supply unit is connected with the whole system of the primary current measuring slave;
the electricity utilization inspection tester host computer and the secondary current measurement are connected by wire.
2. The electricity inspection tester with low-voltage four-way primary current measurement according to claim 1, wherein the master machine of the electricity inspection tester with low-voltage four-way primary current measurement and the primary current measurement slave machine are connected by wire, and the master machine of the electricity inspection tester sends a synchronous clock signal to the primary current measurement slave machine to control the primary current measurement slave machine to realize synchronous measurement.
3. The electrical inspection instrument with low-voltage four-way primary current measurement according to claim 1, wherein the master power supply unit supplies power to the entire system unit of the master of the electrical inspection instrument, and directly supplies power to the primary current measurement slave.
4. The electrical inspection instrument with low-voltage four-way primary current measurement according to claim 1, wherein the communication unit performs communication between the electrical inspection instrument host and the primary current measurement slave, and the primary current measurement slave transmits measurement data to the host through digital communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121887841.0U CN216013495U (en) | 2021-08-12 | 2021-08-12 | Electricity inspection appearance with low pressure four ways primary current measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121887841.0U CN216013495U (en) | 2021-08-12 | 2021-08-12 | Electricity inspection appearance with low pressure four ways primary current measurement |
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| Publication Number | Publication Date |
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| CN216013495U true CN216013495U (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121887841.0U Active CN216013495U (en) | 2021-08-12 | 2021-08-12 | Electricity inspection appearance with low pressure four ways primary current measurement |
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| Country | Link |
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| CN (1) | CN216013495U (en) |
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2021
- 2021-08-12 CN CN202121887841.0U patent/CN216013495U/en active Active
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