CN208399622U - A kind of power utility check instrument for checking low-voltage power line leakage point of electricity - Google Patents

Abstract

The utility model discloses the power utility check instrument that one kind can check low-voltage power line leakage point of electricity, including host and PAD main body, soldering has four road electric current input interfaces, current sample amplifying circuit, phase-locked loop circuit and frequency measurement, AD analog to digital conversion circuit and DSP2812 data processing on circuit board inside the host, the circuit board of PAD body interior is shown equipped with terminal and control module, is connected with the terminal plate being connected with four road electric current input interfaces on the outer wall of host.Originally the power utility check instrument of low-voltage power line leakage point of electricity can be checked, the terminal plate of the corresponding insertion host of current clamp, the corresponding access voltage wiring terminal of voltage tester line, by the way that input signal converts sampled data by AD7606 after current sample amplifying circuit, it send and is calculated by DSP2812 data processing, finally determine that electric leakage is the rear there are the front of current line or route by a series of vector sum scheduling algorithm, then by repeatedly testing the final route place determined in the presence of electric leakage in the different location of route.

Description

A kind of power utility check instrument for checking low-voltage power line leakage point of electricity

Technical field

The utility model relates to detecting instrument technical field, specially a kind of use that can check low-voltage power line leakage point of electricity Electric medical-examination device.

Background technique

Power utility check instrument currently on the market only has test three-phase voltage three-phase current substantially, then realizes electric energy meter error Verification, some common functions such as wiring differentiation.And for the presence or absence of electric leakage need by other tool or instrument come into The case where row detection, this mode has electric leakage for the route between from transformer to user can not find electric leakage, and there are points.

Utility model content

The purpose of this utility model is to provide the power utility check instrument that one kind can check low-voltage power line leakage point of electricity, have The advantages of can detecte and whether leak electricity, and showing data using portable instrument, solves the problems of the prior art.

To achieve the above object, the utility model provides the following technical solutions: one kind can check low-voltage power line electric leakage The power utility check instrument of point, including host and PAD main body, soldering has the input of four road electric currents to connect on the circuit board inside the host Mouth, current sample amplifying circuit, phase-locked loop circuit and frequency measurement, AD analog to digital conversion circuit and DSP2812 data processing, PAD main body Internal circuit board is shown equipped with terminal and control module, is connected on the outer wall of host and is connected with four road electric current input interfaces Terminal plate, be respectively equipped with voltage wiring terminal and current wiring terminal on the terminal plate, what voltage wiring terminal was embedded in Voltage tester line is installed on conducting wire, current clamp is connected on the conducting wire that current wiring terminal is embedded in, four road electric current is defeated The output end of incoming interface connects with current sample amplifying circuit and phase-locked loop circuit and frequency measurement respectively, current sample amplifying circuit Output end is connect with AD analog to digital conversion circuit, the output end of phase-locked loop circuit and frequency measurement and AD analog to digital conversion circuit 14 with DSP2812 data processing be connected DSP2812 data processing and terminal show and control module between pass through and be wirelessly connected.

Preferably, the current sample amplifying circuit meets capacitor C203, capacitor by the pin 1 of amplifier AD8221 chip The parallel interface of C106 and resistance R331, capacitor C106 and resistance R331 earth, the pin 4 of amplifier AD8221 chip Connect the parallel interface of capacitor C203 and IR01, the parallel interface of another the termination capacitor C235 and resistance R330 of IR01, capacitor The series connection of pin 7 IR04 of the other end of C235 and resistance R330 ground connection, amplifier AD8221 chip meets diode ID01, diode The parallel interface of ID02 and IC94.

Preferably, the AD analog to digital conversion circuit is connected with the pin 11 of TMS320F2812 chip in the partial circuit of CPU Capacitor C98 ground connection, 10 series capacitance C99 of the pin ground connection of TMS320F2812 chip, 76 He of pin of TMS320F2812 chip 77 parallel-connected transistor oscillator CX01 distinguish series capacitance CC02 and capacitor CC03 ground connection.

Compared with prior art, the beneficial effects of the utility model are as follows:

Originally the power utility check instrument that low-voltage power line leakage point of electricity can be checked, by A, B, the corresponding insertion host of C current clamp is connect Neutral line current at Qc, is clamped insertion pulse input end, the corresponding access voltage wiring terminal of voltage tester line leads to by the Qa of line plate, Qb It crosses and converts input signal to sampled data by AD7606 after current sample amplifying circuit, send by DSP2812 data processing It calculates, finally determines that electric leakage is the rear there are the front of current line or route by a series of vector sum scheduling algorithm, Then by repeatedly testing the final route place determined in the presence of electric leakage in the different location of route, machine passes through PAD after carefully connecting the wire Ontology executes various functions order, and operation more safe ready, large screen display data are more intuitive, and all test datas are whole It is stored on PAD ontology, conveniently checks in the future and data upload.

Detailed description of the invention

Fig. 1 is the overall structure figure of the utility model；

Fig. 2 is the terminal plate structure chart of the utility model；

Fig. 3 is the module connection figure of the utility model；

Fig. 4 is the sampling operational amplifier circuit schematic diagram of the utility model；

Fig. 5 is the part catenation principle figure of the CPU and AD7606 of the utility model；

Fig. 6 is the CPU and WiFi module catenation principle figure of the utility model.

In figure: 1, host；11, four road electric current input interface；12, current sample amplifying circuit；13, phase-locked loop circuit and survey Frequently；14, AD analog to digital conversion circuit；15, DSP2812 data processing；2, PAD main body；21, terminal is shown and control module；3, it connects Line plate；31, voltage wiring terminal；311, voltage tester line；32, current wiring terminal；321, current clamp.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

A kind of power utility check instrument that can check low-voltage power line leakage point of electricity referring to FIG. 1-2, including host 1 and PAD master Body 2, soldering has four road electric current input interfaces 11, current sample amplifying circuit 12, phase-locked loop circuit on the circuit board inside host 1 And frequency measurement 13, AD analog to digital conversion circuit 14 and DSP2812 data processing 15, the circuit board inside PAD main body 2 are aobvious equipped with terminal Show and control module 21, be connected with the terminal plate 3 being connected with four road electric current input interfaces 11 on the outer wall of host 1, on terminal plate 3 It is respectively equipped with voltage wiring terminal 31 and current wiring terminal 32, voltage is installed on the conducting wire that voltage wiring terminal 31 is embedded in P-wire 311 increases neutral line current sampling to realize comprising A phase current, B phase current, the four roads letter of C phase current and neutral line current Number synchronized sampling is calculated by carrying out component in X-axis and Y-axis respectively to four road current signals and then calculates vector sum, to Final vector sum is then determined to have electric leakage when exceeding a certain particular value, the electric current in each phase is by using respectively in each phase Individual pincerlike meter detection, so detection can be carried out to each position of route substantially to finally determine the existing ground of electric leakage It is square, current clamp 321 is connected on the conducting wire that current wiring terminal 32 is embedded in, current clamp 321 accesses the Qa, Qb, Qc on panel Place, neutral line current cramp joint is entered to indicate on panel at the aviation plug seat of P, can measure 4 road current signals simultaneously, includes A phase electricity Stream, B phase current, C phase current and neutral line current signal acquire four road current signals by different location on the line and pass through number According to analytical calculation obtain with the presence or absence of electric leakage and leak electricity there are point near route,

Referring to Fig. 3, the output end of four road electric current input interfaces 11 respectively with current sample amplifying circuit 12 and phaselocked loop Circuit and frequency measurement 13 connect, and the output end of current sample amplifying circuit 12 is connect with AD analog to digital conversion circuit, phase-locked loop circuit and The output end of frequency measurement 13 and AD analog to digital conversion circuit 14 be connected with DSP2812 data processing 15 DSP2812 data processing 15 with Terminal show and control module 21 between by being wirelessly connected, using CPU and WIFI module telecommunication circuit then with PAD main body 2 Connection, can show three-phase voltage, electric current in conjunction with 2 technology of PAD main body, the parameters such as power pass through at any time on PAD main body 2 PAD main body 2 realizes the various functions of power utility check, and PAD main body 2 directly stores every test data, and amount of storage can accomplish very Greatly.

Fig. 4-6 is please referred to, current sample amplifying circuit 12 meets capacitor C203, electricity by the pin 1 of amplifier AD8221 chip Hold the parallel interface of C106 and resistance R331, capacitor C106 and resistance R331 earth, amplifier AD8221 chip draw Foot 4 connects the parallel interface of capacitor C203 and IR01, the parallel interface of another the termination capacitor C235 and resistance R330 of IR01, capacitor The series connection of pin 7 IR04 of the other end of C235 and resistance R330 ground connection, amplifier AD8221 chip meets diode ID01, diode The pin 11 of TMS320F2812 chip in the partial circuit of the parallel interface of ID02 and IC94, AD analog to digital conversion circuit 14 and CPU Series capacitance C98 ground connection, 10 series capacitance C99 of the pin ground connection of TMS320F2812 chip, the pin of TMS320F2812 chip 76 and 77 parallel-connected transistor oscillator CX01 distinguish series capacitance CC02 and capacitor CC03 ground connection.

In summary: originally can check the power utility check instrument of low-voltage power line leakage point of electricity, by A, B, C current clamp 321 is corresponding At the Qa of the terminal plate 3 of insertion host, Qb, Qc, by 321 insertion pulse input ends of neutral line current pincers, voltage tester line 311 is corresponding Voltage wiring terminal 31 is accessed, by turning input signal to sampled data by AD7606 after current sample amplifying circuit 12 It changes, send and calculated by DSP2812 data processing 15, finally determine that electric leakage is to exist to work as front by a series of vector sum scheduling algorithm The front on road or the rear of route, then by repeatedly testing the final route determined in the presence of electric leakage in the different location of route Place, machine execute various functions order by PAD after carefully connecting the wire, operation more safe ready, large screen display data are more straight It sees, all test datas are all stored on PAD ontology 2, conveniently check in the future and data upload.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (3)

1. one kind can check the power utility check instrument of low-voltage power line leakage point of electricity, including host (1) and PAD main body (2), feature Be: soldering has four road electric current input interfaces (11), current sample amplifying circuit on the internal circuit board of the host (1) (12), phase-locked loop circuit and frequency measurement (13), AD analog to digital conversion circuit (14) and DSP2812 data processing (15), PAD main body (2) Internal circuit board is shown equipped with terminal and control module (21), is connected on the outer wall of host (1) and four road electric currents input Interface (11) connected terminal plate (3) is respectively equipped with voltage wiring terminal (31) and current wiring terminal on the terminal plate (3) (32), it is equipped with voltage tester line (311) on the conducting wire that voltage wiring terminal (31) is embedded in, current wiring terminal (32) is embedded It is connected on the conducting wire entered current clamp (321), the output end of the four roads electric current input interface (11) is put with current sample respectively Big circuit (12) and phase-locked loop circuit and frequency measurement (13) connect, the output end and AD analog-to-digital conversion of current sample amplifying circuit (12) The output end of circuit connection, phase-locked loop circuit and frequency measurement (13) and AD analog to digital conversion circuit (14) with DSP2812 data processing (15) DSP2812 data processing (15) and the terminal of being connected show and control module (21) between pass through and be wirelessly connected.

2. the power utility check instrument that one kind according to claim 1 can check low-voltage power line leakage point of electricity, it is characterised in that: The current sample amplifying circuit (12) connects capacitor C203, capacitor C106 and resistance by the pin 1 of amplifier AD8221 chip The parallel interface of R331, capacitor C106 and resistance R331 earth, the pin 4 of amplifier AD8221 chip connect capacitor C203 and The parallel interface of IR01, the parallel interface of another the termination capacitor C235 and resistance R330 of IR01, capacitor C235 and resistance R330 Other end ground connection, the pin 7 of amplifier AD8221 chip connect IR04 connect diode ID01, diode ID02 and IC94's and Connecting port.

3. the power utility check instrument that one kind according to claim 1 can check low-voltage power line leakage point of electricity, it is characterised in that: The AD analog to digital conversion circuit (14) and the 11 series capacitance C98 of pin of TMS320F2812 chip in the partial circuit of CPU connect Ground, 10 series capacitance C99 of the pin ground connection of TMS320F2812 chip, the parallel-connected transistor of pin 76 and 77 of TMS320F2812 chip Oscillator CX01 distinguishes series capacitance CC02 and capacitor CC03 ground connection.