CN107167758B - Transformer transformation ratio and polarity tester with waveform display function - Google Patents

Transformer transformation ratio and polarity tester with waveform display function Download PDF

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Publication number
CN107167758B
CN107167758B CN201710560723.0A CN201710560723A CN107167758B CN 107167758 B CN107167758 B CN 107167758B CN 201710560723 A CN201710560723 A CN 201710560723A CN 107167758 B CN107167758 B CN 107167758B
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China
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resistor
pin
capacitor
voltage
chip
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CN107167758A (en
Inventor
陶永茂
陶继来
于正涛
关凯
韩小虎
李悦悦
王白石
杨帆
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/20Measuring number of turns; Measuring transformation ratio or coupling factor of windings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/72Testing of electric windings

Abstract

A transformer transformation ratio and polarity tester with a waveform display function belongs to the technical field of relay protection test instruments of power systems, and particularly relates to a transformer transformation ratio and polarity tester with a waveform display function. The invention provides a transformer transformation ratio and polarity tester with a waveform display function, which is convenient to use and reliable in testing. The invention comprises an inverter, a battery, a voltage regulator and a measuring meter with a waveform display function and capable of measuring the primary added voltage effective value of a voltage transformer and the secondary voltage output value of the voltage transformer.

Description

Transformer transformation ratio and polarity tester with waveform display function
Technical Field
The invention belongs to the technical field of relay protection test instruments of power systems, and particularly relates to a transformer transformation ratio and polarity tester with a waveform display function.
Background
The polarity and transformation ratio check work of the current and voltage transformers before formal live operation is indispensable, and the correctness of the check result is very important.
The traditional Current Transformer (CT) polarity test method is as follows: the dot polarity of dry cell is adopted.
As shown in FIG. 1: at the moment of closing the CT primary side switch K, the CT secondary induction current flows out from K1 and flows back to the end K2 through the ammeter, the current flows in from the + end of the direct current ammeter and flows out from the-end, and the pointer of the direct current ammeter deflects in the forward direction, otherwise, at the moment of disconnecting the K, the pointer of the ammeter deflects in the reverse direction. It is explained that the L1 terminal of the primary coil and the K1 terminal of the secondary coil of the current transformer are the same polarity terminals. The method for checking the polarity has the advantages of multiple test links, unobvious effect and easy error of test results due to wiring errors or no alignment of the method.
The traditional Current Transformer (CT) transformation ratio test method comprises the following steps: and (3) introducing a large current i1 into a primary coil of the CT, measuring a secondary current i2 of the CT, and calculating the ratio of i1 to i2 to be the transformation ratio of the CT. The disadvantages of this method are: the experimental instrument is heavy, dozens of jin are achieved, the experimental instrument is not easy to carry, the experimental line is thick and heavy, the accuracy of the experimental result is poor, and the workload is large.
Disclosure of Invention
The invention aims at the problems and provides a transformer transformation ratio and polarity tester with a waveform display function, which is convenient to use and reliable in testing.
The invention adopts the following technical scheme that the device comprises an inverter, a battery, a voltage regulator and a measuring meter with a waveform display function and capable of measuring the primary added voltage effective value of a voltage transformer and the secondary voltage output value of the voltage transformer.
The measuring meter comprises an alternating current input part, a waveform output and phase detection circuit, a rectification filter circuit, an analog-to-digital conversion circuit, a main control part, a voltage stabilizing circuit and a display screen, wherein an input port of the alternating current input part is respectively connected with a measuring end of a primary coil of the measuring meter, a measuring end of a secondary coil of the measuring meter and an output port of a gain switching control part, an output port of the alternating current input part is respectively connected with an input port of the rectification filter circuit and an input port of the waveform output and phase detection circuit, and an output port of the rectification filter circuit is connected with an input port of the analog-to-digital.
The main control part is respectively connected with the input port of the gain switching control part, the output port of the waveform output and phase detection circuit, the output port of the analog-to-digital conversion circuit, the display screen and the voltage stabilizing circuit.
Preferably, the inverter of the invention is an inverter with 500W or 1000W of power, 12V of direct current input and 220V of alternating current output, the battery is a lithium ion battery or a lead-acid maintenance-free battery with 12V and 20-100 ampere hours, and the voltage regulator is a voltage regulator with 220 AC input and 0-250V of voltage power of 500W output.
As another preferred scheme, the main control part comprises an STM32F103VDT6 chip U7 and an STM32F103VDT6 chip U21.
The waveform output and phase detection circuit comprises opa2333 chip UA7 and opa2333 chip UA 8.
The analog-to-digital conversion circuit comprises an ad7705 chip U1.
The alternating current input part comprises an opa2333 chip UA1 and an opa2333 chip UA2, a pin 3 of the UA1 is respectively connected with an anode of a diode D1, a cathode of the diode D2, one end of a resistor R4, one end of a resistor R9, one end of a resistor R11, one end of a resistor R14 and one end of a resistor R16, the other end of the resistor R4 is connected with one end of a primary coil of the voltage transformer sequentially through a resistor R5 and a capacitor C5, a cathode of the diode D1 is connected with an AVCC5V end, and an anode of the diode D2 is connected; the other end of the resistor R9 is connected with pin 1 of the SN74LVC1G3157DCKR chip U2, and pin 6 of U2 is connected with pin 53 of U7.
The other end of the resistor R11 is connected with pin 1 of the SN74LVC1G3157DCKR chip U3, and pin 6 of U3 is connected with pin 52 of U7.
The other end of the resistor R14 is connected with pin 1 of the SN74LVC1G3157DCKR chip U4, and pin 6 of U4 is connected with pin 51 of U7.
The other end of the resistor R16 is connected with pin 1 of the SN74LVC1G3157DCKR chip U6, and pin 6 of U6 is connected with pin 48 of U7.
A pin 1 of the UA1 is respectively connected with one end of a resistor R2, one end of a capacitor C6 and one end of a resistor R12, the other end of the resistor R12 is respectively connected with a pin 2 of the UA1 and one end of a resistor R15, the other end of the resistor R15 is connected with 2.5V, and the other end of the resistor R2 is respectively connected with a pin 3 of the UA7 and one end of the capacitor C21; the other end of a capacitor C6 is respectively connected with one end of a resistor R7, one end of a capacitor C8, one end of a capacitor C10, one end of a resistor R13 and 6 pins of a UA1 through a resistor R8, the other end of a resistor R7 is respectively connected with one end of a resistor R6, the other end of a capacitor C8 and a cathode of a diode D4, the other end of a resistor R6 is respectively connected with one end of a capacitor C7 and one end of a resistor R3, the other end of a resistor R3 is respectively connected with one end of a capacitor C9 and a7 pin of a U1, the other end of a capacitor C9 is respectively connected with the other end of a capacitor C7, an 8 pin of the U7, the other end of a capacitor C7, the other end of a resistor R7 and an anode of the diode D7, a cathode of the diode D7 is respectively connected with an anode.
A pin 3 of the UA2 is respectively connected with an anode of a diode D6, a cathode of a diode D7, one end of a resistor R20, one end of a resistor R26, one end of a resistor R27, one end of a resistor R31 and one end of a resistor R33, the other end of the resistor R20 is connected with one end of a secondary coil of a voltage transformer sequentially through a resistor R21 and a capacitor C24, a cathode of the diode D6 is connected with an AVCC5V end, and an anode of the diode D7 is connected with an AGND end; the other end of the resistor R26 is connected with pin 1 of the SN74LVC1G3157DCKR chip U9, and pin 6 of U9 is connected with pin 47 of U7.
The other end of the resistor R27 is connected with pin 1 of the SN74LVC1G3157DCKR chip U10, and pin 6 of U10 is connected with pin 46 of U7.
The other end of the resistor R31 is connected with pin 1 of the SN74LVC1G3157DCKR chip U11, and pin 6 of U11 is connected with pin 45 of U7.
The other end of the resistor R33 is connected with pin 1 of the SN74LVC1G3157DCKR chip U12, and pin 6 of U12 is connected with pin 44 of U7.
A pin 1 of the UA2 is respectively connected with one end of a resistor R17, one end of a capacitor C23 and one end of a resistor R29, the other end of the resistor R29 is respectively connected with a pin 2 of the UA2 and one end of a resistor R32, the other end of the resistor R32 is connected with 2.5V, and the other end of the resistor R17 is respectively connected with a pin 3 of the UA8 and one end of the capacitor C33; the other end of a capacitor C23 is respectively connected with one end of a resistor R24, one end of a capacitor C28, one end of a capacitor C31, one end of a resistor R30 and 6 feet of a UA2 through a resistor R25, the other end of a resistor R24 is respectively connected with one end of a resistor R23, the other end of a capacitor C28 and a cathode of a diode D8, the other end of a resistor R23 is respectively connected with one end of a capacitor C26 and one end of a resistor R22, the other end of a resistor R22 is respectively connected with one end of a capacitor C30 and 6 feet of a U1, the other end of a capacitor C30 is respectively connected with the other end of a capacitor C26, an 11 foot of the U26, the other end of the capacitor C26, the other end of the resistor R26 and an anode of the diode D26, a cathode of the diode D26 is respectively connected with an anode of the.
The other end of the primary coil of the voltage transformer and the other end of the secondary coil of the voltage transformer are connected with the AGND.
2 pins of the UA7 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C29 through a capacitor C130, the other end of the capacitor C29 is connected with an AVCC5V power supply, and 1 pin of the UA7 is respectively connected with 97 pins of U21 and 97 pins of U7; the capacitor C21 is respectively connected with a pin 6 of the UA7 and one end of the resistor R28 through a resistor R19, the other end of the resistor R28 is respectively connected with a pin 7 of the UA7 and one end of the resistor R18, the other end of the resistor R18 is respectively connected with a pin 31 of the U21 and one end of the capacitor C22, and the other end of the capacitor C22 is connected with AGND; the 5 pin of UA7 is connected to 1.5V.
2 pins of the UA8 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C43 through a capacitor C152, the other end of the capacitor C43 is connected with an AVCC5V power supply, and 1 pin of the UA8 is respectively connected with 98 pins of U21 and 98 pins of U7; the capacitor C33 is respectively connected with a pin 6 of the UA8 and one end of the resistor R38 through a resistor R36, the other end of the resistor R38 is respectively connected with a pin 7 of the UA8 and one end of the resistor R37, the other end of the resistor R37 is respectively connected with a pin 32 of the U21 and one end of the capacitor C34, and the other end of the capacitor C34 is connected with AGND; the 5 pin of UA8 is connected to 1.5V.
The 1 pin of U1 is connected with the 71 pin of U7, the 2 pin of U1 is respectively connected with one end of a crystal oscillator Y1 and one end of a capacitor C11, the other end of the capacitor C11 is respectively connected with the 3 pin of U1 at the other end of the crystal oscillator Y1 through a capacitor C12, the 4 pin of U1 is connected with the 70 pin of U7, the 5 pin of U1 is connected with the 29 pin of U7, the 6 pin of U1 is connected with the 29 pin of U7, the 14 pin of U1 is connected with the 68 pin of U7, the 13 pin of U1 is connected with the 67 pin of U7, the 12 pin of U1 is connected with the 66 pin of U7, the 10 pin of U1 is respectively connected with one end of a resistor R134, one end of a capacitor C1, one end of a capacitor C2, one end of a capacitor C3 and one end of a capacitor C4, the other end of the resistor R134 is respectively connected with one end of AGND and rheostat R1, the other end of the capacitor C36 1 is connected with another AVCC5V, the other end of the capacitor C1.
The 26 leg of U7 is connected to the 78 leg of U21, and the 25 leg of U7 is connected to the 79 leg of U21.
In addition, the voltage stabilizing circuit comprises a REF02 chip U30, an LM358 chip UA13, a KA34063A chip U31 and a PAM2312 chip U32, wherein 2 feet of the U30 are connected with a battery through a resistor R110, 6 feet of the U30 are respectively connected with one end of a resistor R111 and one end of a resistor R119, the other end of the resistor R119 is respectively connected with one end of a resistor R122 and 5 feet of the UA13, the other end of the resistor R122 is respectively connected with AGND and 4 feet of the U30, 7 feet of the UA13 are respectively connected with 6 feet of the UA13 and one end of the resistor R125, and the other end of the resistor R125 is grounded through a capacitor C; the other end of the resistor R125 is a 2.5V voltage end; the other end of the resistor R111 is connected with a pin 3 of the UA13, a pin 1 of the UA13 is connected with a base electrode of an NPN triode Q1 through a resistor R114, a collector electrode of the triode Q1 is connected with a pin 2 of the U30, an emitter electrode of the triode Q1 is a VCC5V power supply end and is respectively connected with a pin 2 of the UA13, one end of a resistor R112, one end of a variable resistor R115 and one end of a resistor R113, the other end of the resistor R112 is a 1.5V voltage end and is respectively connected with one end of a resistor R117 and one end of a capacitor C119, and the other end of; the adjusting end of the variable resistor R115 is a 2.7V voltage end and is grounded through the capacitor C120, and the other end of the variable resistor R115 is grounded; the other end of the resistor R113 is a 3V voltage end and is respectively connected with one end of the resistor R118 and one end of the capacitor C121, and the other end of the resistor R118 and the other end of the capacitor C121 are grounded.
Pin 1 of U31 is connected to anode of diode D27 and one end of inductor L2, cathode of diode D27 is connected to one end of resistor R121 and battery, the other end of resistor R121 is connected to one end of resistor R126 and pin 5 of U31, the other end of resistor R126 is grounded, the other end of inductor L2 is connected to one end of resistor R120, one end of resistor R123, pin 6 of U31 and power supply terminal VCC5V, the other end of resistor R120 is connected to pin 8 of U31, and the other end of resistor R123 is connected to pin 7 of U31.
A pin 1 of the U32 is connected with a power supply end of VCC5 through a resistor R127, a pin 2 of the U32 is respectively connected with a pin 5 of the resistors R131 and U32 through a resistor R130, the other end of the resistor R131 is respectively connected with one end of an inductor L4 and one end of an inductor L5, the other end of the inductor L4 is connected with a pin 3 of the U32, and the other end of the inductor L5 is connected with a power supply end of VCC 3.3; the 4-pin of U32 is connected to the VCC5 power supply terminal.
The invention has the beneficial effects.
The invention integrates the tester and the measuring meter together to produce a portable tester which can complete the test of CT transformation ratio and polarity at one time.
The tester has the functions of displaying the waveform and testing the effective value of the sine wave, and has high-precision testing effect on large and small voltages.
The invention uses the mode of transformation ratio to test the transformation ratio; polarity test was performed with the waveform display function. And combining the two tests into a one-step test; the tester and the meter of the test meter are combined into a whole to form a comprehensive tester.
Different from the traditional and widely used method for testing the transformation ratio polarity of the transformer, the invention combines two works of transformation ratio and polarity test into one by utilizing a current transformer, a voltage transformer transformation ratio and a polarity tester with a waveform display function.
The invention utilizes the small voltage to check the transformation ratio and the polarity of the voltage transformer with large transformation ratio.
The invention can use the voltage ratio method to replace the current ratio method to carry out the transformation ratio verification on the current transformer, and uses the waveform display and comparison method to carry out the polarity verification on the current transformer.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a wiring diagram of a traditional test method for polarity verification of a current transformer.
Fig. 2 shows voltage waveforms of a secondary winding when the transformers a and C have the same polarity.
Fig. 3 shows voltage waveforms of a secondary winding when transformers a and C are reversed polarity terminals.
Fig. 4 is a block diagram of the present invention.
Fig. 5 is a schematic diagram of an ac input part circuit and a rectifying and filtering circuit of the present invention.
FIG. 6 is a circuit diagram of waveform output and phase detection according to the present invention.
Fig. 7 is a circuit diagram of the rectifying and filtering circuit of fig. 5.
Fig. 8 and 9 are circuit diagrams of analog-to-digital conversion according to the present invention.
Fig. 10 is a schematic circuit diagram of the main control portion of the present invention.
Fig. 11-14 are exploded views of fig. 10 from top to bottom.
FIGS. 15-17 are schematic diagrams of a voltage regulator circuit of the present invention.
Fig. 18 is a schematic circuit diagram of an ac input portion of fig. 5.
Detailed Description
As shown in the figure, the voltage regulator comprises an inverter, a battery, a voltage regulator and a measuring meter with a waveform display function, wherein the measuring meter is capable of measuring an effective value of primary added voltage of a voltage transformer and an output value of secondary voltage of the voltage transformer, a power input end of the inverter is connected with the battery, a power output end of the inverter is connected with a power input end of the voltage regulator, a power output end of the voltage regulator is connected with a primary coil of the voltage transformer, the primary coil of the voltage transformer is connected with a measuring end of a primary coil of the measuring meter, a secondary coil of the voltage transformer is connected with a measuring end of a secondary coil of the measuring meter, and a power.
The measuring meter comprises an alternating current input part, a waveform output and phase detection circuit, a rectification filter circuit, an analog-to-digital conversion circuit, a main control part, a voltage stabilizing circuit and a display screen, wherein an input port of the alternating current input part is respectively connected with a measuring end of a primary coil of the measuring meter, a measuring end of a secondary coil of the measuring meter and an output port of a gain switching control part, an output port of the alternating current input part is respectively connected with an input port of the rectification filter circuit and an input port of the waveform output and phase detection circuit, and an output port of the rectification filter circuit is connected with an input port of the analog-to-digital.
The main control part is respectively connected with the input port of the gain switching control part, the output port of the waveform output and phase detection circuit, the output port of the analog-to-digital conversion circuit, the display screen and the voltage stabilizing circuit.
The inverter is an inverter with the power of 500W or 1000W, the input of the inverter is direct current 12V, the output of the inverter is alternating current 220V sine wave, the battery is a lithium ion battery or a lead-acid maintenance-free battery with the power of 12V and 20-100 ampere hours, and the voltage regulator is a voltage regulator which inputs 220 AC and outputs the voltage power of 0-250V and 500W.
The main control part comprises an STM32F103VDT6 chip U7 and an STM32F103VDT6 chip U21.
The waveform output and phase detection circuit comprises opa2333 chip UA7 and opa2333 chip UA 8.
The analog-to-digital conversion circuit comprises an ad7705 chip U1.
The alternating current input part comprises an opa2333 chip UA1 and an opa2333 chip UA2, a pin 3 of the UA1 is respectively connected with an anode of a diode D1, a cathode of a diode D2, one end of a resistor R4, one end of a resistor R9, one end of a resistor R11, one end of a resistor R14 and one end of a resistor R16, the other end of a resistor R4 is sequentially connected with one end (end A of the voltage transformer in the figure 4) of a primary coil of the voltage transformer through a resistor R5 and a capacitor C5, a cathode of the diode D1 is connected with an AVCC5V end, and an anode of the diode D2; the other end of the resistor R9 is connected with pin 1 of the SN74LVC1G3157DCKR chip U2, and pin 6 of U2 is connected with pin 53 of U7.
The other end of the resistor R11 is connected with pin 1 of the SN74LVC1G3157DCKR chip U3, and pin 6 of U3 is connected with pin 52 of U7.
The other end of the resistor R14 is connected with pin 1 of the SN74LVC1G3157DCKR chip U4, and pin 6 of U4 is connected with pin 51 of U7.
The other end of the resistor R16 is connected with pin 1 of the SN74LVC1G3157DCKR chip U6, and pin 6 of U6 is connected with pin 48 of U7.
A pin 1 of the UA1 is respectively connected with one end of a resistor R2, one end of a capacitor C6 and one end of a resistor R12, the other end of the resistor R12 is respectively connected with a pin 2 of the UA1 and one end of a resistor R15, the other end of the resistor R15 is connected with 2.5V, and the other end of the resistor R2 is respectively connected with a pin 3 of the UA7 and one end of the capacitor C21; the other end of a capacitor C6 is respectively connected with one end of a resistor R7, one end of a capacitor C8, one end of a capacitor C10, one end of a resistor R13 and 6 pins of a UA1 through a resistor R8, the other end of a resistor R7 is respectively connected with one end of a resistor R6, the other end of a capacitor C8 and a cathode of a diode D4, the other end of a resistor R6 is respectively connected with one end of a capacitor C7 and one end of a resistor R3, the other end of a resistor R3 is respectively connected with one end of a capacitor C9 and a7 pin of a U1, the other end of a capacitor C9 is respectively connected with the other end of a capacitor C7, an 8 pin of the U7, the other end of a capacitor C7, the other end of a resistor R7 and an anode of the diode D7, a cathode of the diode D7 is respectively connected with an anode.
A pin 3 of the UA2 is connected to an anode of a diode D6, a cathode of a diode D7, one end of a resistor R20, one end of a resistor R26, one end of a resistor R27, one end of a resistor R31, and one end of a resistor R33, respectively, the other end of the resistor R20 is connected to one end of a secondary coil of a voltage transformer (the end B of the voltage transformer in fig. 4) sequentially through a resistor R21 and a capacitor C24, a cathode of the diode D6 is connected to the end AVCC5V, and an anode of the diode D7 is connected to the; the other end of the resistor R26 is connected with pin 1 of the SN74LVC1G3157DCKR chip U9, and pin 6 of U9 is connected with pin 47 of U7.
The other end of the resistor R27 is connected with pin 1 of the SN74LVC1G3157DCKR chip U10, and pin 6 of U10 is connected with pin 46 of U7.
The other end of the resistor R31 is connected with pin 1 of the SN74LVC1G3157DCKR chip U11, and pin 6 of U11 is connected with pin 45 of U7.
The other end of the resistor R33 is connected with pin 1 of the SN74LVC1G3157DCKR chip U12, and pin 6 of U12 is connected with pin 44 of U7.
A pin 1 of the UA2 is respectively connected with one end of a resistor R17, one end of a capacitor C23 and one end of a resistor R29, the other end of the resistor R29 is respectively connected with a pin 2 of the UA2 and one end of a resistor R32, the other end of the resistor R32 is connected with 2.5V, and the other end of the resistor R17 is respectively connected with a pin 3 of the UA8 and one end of the capacitor C33; the other end of a capacitor C23 is respectively connected with one end of a resistor R24, one end of a capacitor C28, one end of a capacitor C31, one end of a resistor R30 and 6 feet of a UA2 through a resistor R25, the other end of a resistor R24 is respectively connected with one end of a resistor R23, the other end of a capacitor C28 and a cathode of a diode D8, the other end of a resistor R23 is respectively connected with one end of a capacitor C26 and one end of a resistor R22, the other end of a resistor R22 is respectively connected with one end of a capacitor C30 and 6 feet of a U1, the other end of a capacitor C30 is respectively connected with the other end of a capacitor C26, an 11 foot of the U26, the other end of the capacitor C26, the other end of the resistor R26 and an anode of the diode D26, a cathode of the diode D26 is respectively connected with an anode of the.
The other end of the primary coil of the voltage transformer and the other end of the secondary coil of the voltage transformer are connected with the AGND.
2 pins of the UA7 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C29 through a capacitor C130, the other end of the capacitor C29 is connected with an AVCC5V power supply, and 1 pin of the UA7 is respectively connected with 97 pins of U21 and 97 pins of U7; the capacitor C21 is respectively connected with a pin 6 of the UA7 and one end of the resistor R28 through a resistor R19, the other end of the resistor R28 is respectively connected with a pin 7 of the UA7 and one end of the resistor R18, the other end of the resistor R18 is respectively connected with a pin 31 of the U21 and one end of the capacitor C22, and the other end of the capacitor C22 is connected with AGND; the 5 pin of UA7 is connected to 1.5V.
2 pins of the UA8 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C43 through a capacitor C152, the other end of the capacitor C43 is connected with an AVCC5V power supply, and 1 pin of the UA8 is respectively connected with 98 pins of U21 and 98 pins of U7; the capacitor C33 is respectively connected with a pin 6 of the UA8 and one end of the resistor R38 through a resistor R36, the other end of the resistor R38 is respectively connected with a pin 7 of the UA8 and one end of the resistor R37, the other end of the resistor R37 is respectively connected with a pin 32 of the U21 and one end of the capacitor C34, and the other end of the capacitor C34 is connected with AGND; the 5 pin of UA8 is connected to 1.5V.
The 1 pin of U1 is connected with the 71 pin of U7, the 2 pin of U1 is respectively connected with one end of a crystal oscillator Y1 and one end of a capacitor C11, the other end of the capacitor C11 is respectively connected with the 3 pin of U1 at the other end of the crystal oscillator Y1 through a capacitor C12, the 4 pin of U1 is connected with the 70 pin of U7, the 5 pin of U1 is connected with the 29 pin of U7, the 6 pin of U1 is connected with the 29 pin of U7, the 14 pin of U1 is connected with the 68 pin of U7, the 13 pin of U1 is connected with the 67 pin of U7, the 12 pin of U1 is connected with the 66 pin of U7, the 10 pin of U1 is respectively connected with one end of a resistor R134, one end of a capacitor C1, one end of a capacitor C2, one end of a capacitor C3 and one end of a capacitor C4, the other end of the resistor R134 is respectively connected with one end of AGND and rheostat R1, the other end of the capacitor C36 1 is connected with another AVCC5V, the other end of the capacitor C1.
The 26 leg of U7 is connected to the 78 leg of U21, and the 25 leg of U7 is connected to the 79 leg of U21.
The voltage acquisition of the invention is performed by high-precision ad acquisition after rectification and filtering, and the invention has the advantages of waveform display and the precision of a universal meter.
The voltage stabilizing circuit comprises a REF02 chip U30, an LM358 chip UA13, a KA34063A chip U31 and a PAM2312 chip U32, wherein a pin 2 of the U30 is connected with a battery through a resistor R110, a pin 6 of the U30 is respectively connected with one end of a resistor R111 and one end of a resistor R119, the other end of the resistor R119 is respectively connected with one end of a resistor R122 and a pin 5 of the UA13, the other end of the resistor R122 is respectively connected with an AGND and a pin 4 of the U30, a pin 7 of the UA13 is respectively connected with a pin 6 of the UA13 and one end of a resistor R125, and the other end of the resistor; the other end of the resistor R125 is a 2.5V voltage end; the other end of the resistor R111 is connected with a pin 3 of the UA13, a pin 1 of the UA13 is connected with a base electrode of an NPN triode Q1 through a resistor R114, a collector electrode of the triode Q1 is connected with a pin 2 of the U30, an emitter electrode of the triode Q1 is a VCC5V power supply end and is respectively connected with a pin 2 of the UA13, one end of a resistor R112, one end of a variable resistor R115 and one end of a resistor R113, the other end of the resistor R112 is a 1.5V voltage end and is respectively connected with one end of a resistor R117 and one end of a capacitor C119, and the other end of; the adjusting end of the variable resistor R115 is a 2.7V voltage end and is grounded through the capacitor C120, and the other end of the variable resistor R115 is grounded; the other end of the resistor R113 is a 3V voltage end and is respectively connected with one end of the resistor R118 and one end of the capacitor C121, and the other end of the resistor R118 and the other end of the capacitor C121 are grounded.
Pin 1 of U31 is connected to anode of diode D27 and one end of inductor L2, cathode of diode D27 is connected to one end of resistor R121 and battery, the other end of resistor R121 is connected to one end of resistor R126 and pin 5 of U31, the other end of resistor R126 is grounded, the other end of inductor L2 is connected to one end of resistor R120, one end of resistor R123, pin 6 of U31 and power supply terminal VCC5V, the other end of resistor R120 is connected to pin 8 of U31, and the other end of resistor R123 is connected to pin 7 of U31.
A pin 1 of the U32 is connected with a power supply end of VCC5 through a resistor R127, a pin 2 of the U32 is respectively connected with a pin 5 of the resistors R131 and U32 through a resistor R130, the other end of the resistor R131 is respectively connected with one end of an inductor L4 and one end of an inductor L5, the other end of the inductor L4 is connected with a pin 3 of the U32, and the other end of the inductor L5 is connected with a power supply end of VCC 3.3; the 4-pin of U32 is connected to the VCC5 power supply terminal.
The AC input part of FIG. 18 adopts resistance voltage division to realize automatic control of voltage gain, and the input voltage is divided into five gears of 0-200mV, 200mV-2V, 2V-20V, 20V-200V and 200V-500V. D1, D2 prevent over-voltage from damaging the operational amplifier. The high-precision operational amplifier realizes sine wave output with the maximum wave crest taking 2.5V as a central line not exceeding 5V. The gear adjustment is realized by connecting input signals R9, R11, R14 and R16 with 2.5v respectively through a processor to generate 5 gears for 2.5v partial pressure.
As shown in fig. 6, the sine wave shaping output circuit and the phase detection circuit, the waveform is input into the voltage limiting operational amplifier UA7B through C21, and the sine wave fluctuating in the 0-3V interval with 1.5V as the center is output to the high-speed ADC inside the cpu. The UA7A operational amplifier works in a comparator mode, and when the voltage is larger than 2.7V output, the high level of the output of the operational amplifier triggers the processor to realize phase detection. INT1, INT2 are zero-crossing trigger terminals.
As shown in FIG. 7, the high-precision voltage acquisition circuit adopts a differential voltage output (V1 +, V1-) form, and the waveform is input into UA1B through C6 for mean value rectification and filtering.
As shown in fig. 8, the high-precision analog-to-digital conversion circuit adopts a 16-bit AD7705 conversion chip to realize high-precision voltage acquisition with a voltage acquisition precision of 4 bits and a half.
The invention utilizes 12V direct current provided by a lithium ion battery to be connected to an A/B input end of an inverter, and an alternating current sine wave power supply with the frequency of 50HZ is output from a C/D end through the conversion of the inverter. The power supply is used as a working power supply for testing the transformation ratio and the polarity of the voltage transformer to replace a common wall power supply, and the power supply and the test instrument are integrally designed, so that the power supply saves labor and reduces the magnitude weight of test wiring.
The 50HZ AC sine wave power supply generated by the inverter is connected to the input end A/B of the voltage regulator, and the working voltage required by the transformation ratio polarity of the test voltage transformer of 0-250V is output through the terminal C/D through the air switch K and the isolation transformer in the voltage regulator.
Then the C/D voltage output by the voltage regulator is added to the A/B end of the primary coil of the voltage transformer and the A/B end of the test meter with the waveform display function; in addition, the secondary coil terminal C/D of the voltage transformer (or the current transformer) is connected to the C/D end of the measuring meter with the waveform display function.
The ratio U2/U1 of the AC voltage U1 read from the A/B terminal of the meter and the C/D terminal voltage U2 is the transformation ratio.
The U1 voltage waveform is shown if it is the same as the U2 voltage waveform, as in FIG. 2, then the A and C terminals of the transformer or current transformer are homopolar (while B and D are homopolar).
Voltage waveform of U1 shown if the U1 and U2 voltage waveforms are opposite, as in fig. 3, the a and C terminals of the voltage or current transformer are opposite polarity terminals (while B and D are opposite polarity terminals).
Therefore, the transformation ratio and polarity test of the transformer is completed at one time.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (2)

1. The instrument comprises an inverter, a battery, a voltage regulator and a measuring meter with a waveform display function and capable of measuring a primary added voltage effective value and a secondary voltage output value of the voltage transformer, and is characterized in that a power input end of the inverter is connected with the battery, a power output end of the inverter is connected with a power input end of the voltage regulator, a power output end of the voltage regulator is connected with a primary coil of the voltage transformer, the primary coil of the voltage transformer is connected with a measuring end of the primary coil of the measuring meter, a secondary coil of the voltage transformer is connected with a measuring end of the secondary coil of the measuring meter, and a power supply end of the measuring meter is connected with the battery;
the measuring meter comprises an alternating current input part, a waveform output and phase detection circuit, a rectification filter circuit, an analog-to-digital conversion circuit, a main control part, a voltage stabilizing circuit and a display screen, wherein an input port of the alternating current input part is respectively connected with a measuring end of a primary coil of the measuring meter, a measuring end of a secondary coil of the measuring meter and an output port of a gain switching control part;
the main control part is respectively connected with an input port of the gain switching control part, an output port of the waveform output and phase detection circuit, an output port of the analog-to-digital conversion circuit, a display screen and a voltage stabilizing circuit;
the main control part comprises an STM32F103VDT6 chip U7 and an STM32F103VDT6 chip U21;
the waveform output and phase detection circuit comprises an opa2333 chip UA7 and an opa2333 chip UA 8;
the analog-to-digital conversion circuit comprises an ad7705 chip U1;
the alternating current input part comprises an opa2333 chip UA1 and an opa2333 chip UA2, a pin 3 of the UA1 is respectively connected with an anode of a diode D1, a cathode of the diode D2, one end of a resistor R4, one end of a resistor R9, one end of a resistor R11, one end of a resistor R14 and one end of a resistor R16, the other end of the resistor R4 is connected with one end of a primary coil of the voltage transformer sequentially through a resistor R5 and a capacitor C5, a cathode of the diode D1 is connected with an AVCC5V end, and an anode of the diode D2 is connected; the other end of the resistor R9 is connected with pin 1 of the SN74LVC1G3157DCKR chip U2, and pin 6 of U2 is connected with pin 53 of U7;
the other end of the resistor R11 is connected with pin 1 of the SN74LVC1G3157DCKR chip U3, and pin 6 of U3 is connected with pin 52 of U7;
the other end of the resistor R14 is connected with pin 1 of the SN74LVC1G3157DCKR chip U4, and pin 6 of U4 is connected with pin 51 of U7;
the other end of the resistor R16 is connected with pin 1 of the SN74LVC1G3157DCKR chip U6, and pin 6 of U6 is connected with pin 48 of U7;
a pin 1 of the UA1 is respectively connected with one end of a resistor R2, one end of a capacitor C6 and one end of a resistor R12, the other end of the resistor R12 is respectively connected with a pin 2 of the UA1 and one end of a resistor R15, the other end of the resistor R15 is connected with 2.5V, and the other end of the resistor R2 is respectively connected with a pin 3 of the UA7 and one end of the capacitor C21; the other end of a capacitor C6 is respectively connected with one end of a resistor R7, one end of a capacitor C8, one end of a capacitor C10, one end of a resistor R13 and 6 pins of a UA1 through a resistor R8, the other end of a resistor R7 is respectively connected with one end of a resistor R6, the other end of a capacitor C8 and a cathode of a diode D4, the other end of a resistor R6 is respectively connected with one end of a capacitor C7 and one end of a resistor R3, the other end of a resistor R3 is respectively connected with one end of a capacitor C9 and a7 pin of a U1, the other end of a capacitor C9 is respectively connected with the other end of a capacitor C7, an 8 pin of the U7, the other end of a capacitor C7, the other end of a resistor R7 and an anode of the diode D7, a cathode of the diode D7 is respectively connected with an anode;
a pin 3 of the UA2 is respectively connected with an anode of a diode D6, a cathode of a diode D7, one end of a resistor R20, one end of a resistor R26, one end of a resistor R27, one end of a resistor R31 and one end of a resistor R33, the other end of the resistor R20 is connected with one end of a secondary coil of a voltage transformer sequentially through a resistor R21 and a capacitor C24, a cathode of the diode D6 is connected with an AVCC5V end, and an anode of the diode D7 is connected with an AGND end; the other end of the resistor R26 is connected with pin 1 of the SN74LVC1G3157DCKR chip U9, and pin 6 of U9 is connected with pin 47 of U7;
the other end of the resistor R27 is connected with pin 1 of the SN74LVC1G3157DCKR chip U10, and pin 6 of U10 is connected with pin 46 of U7;
the other end of the resistor R31 is connected with pin 1 of the SN74LVC1G3157DCKR chip U11, and pin 6 of U11 is connected with pin 45 of U7;
the other end of the resistor R33 is connected with pin 1 of the SN74LVC1G3157DCKR chip U12, and pin 6 of U12 is connected with pin 44 of U7;
a pin 1 of the UA2 is respectively connected with one end of a resistor R17, one end of a capacitor C23 and one end of a resistor R29, the other end of the resistor R29 is respectively connected with a pin 2 of the UA2 and one end of a resistor R32, the other end of the resistor R32 is connected with 2.5V, and the other end of the resistor R17 is respectively connected with a pin 3 of the UA8 and one end of the capacitor C33; the other end of a capacitor C23 is respectively connected with one end of a resistor R24, one end of a capacitor C28, one end of a capacitor C31, one end of a resistor R30 and 6 feet of UA2 through a resistor R25, the other end of a resistor R24 is respectively connected with one end of a resistor R23, the other end of a capacitor C28 and a cathode of a diode D8, the other end of a resistor R23 is respectively connected with one end of a capacitor C26 and one end of a resistor R22, the other end of a resistor R22 is respectively connected with one end of a capacitor C30 and 6 feet of U1, the other end of a capacitor C30 is respectively connected with the other end of a capacitor C26, an 11 foot of U26, the other end of a capacitor C26, the other end of a resistor R26 and an anode of a diode D26, a cathode of the diode D26 is respectively connected with an anode of the diode D36;
the other end of the primary coil of the voltage transformer and the other end of the secondary coil of the voltage transformer are connected with the AGND;
2 pins of the UA7 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C29 through a capacitor C130, the other end of the capacitor C29 is connected with an AVCC5V power supply, and 1 pin of the UA7 is respectively connected with 97 pins of U21 and 97 pins of U7; the capacitor C21 is respectively connected with a pin 6 of the UA7 and one end of the resistor R28 through a resistor R19, the other end of the resistor R28 is respectively connected with a pin 7 of the UA7 and one end of the resistor R18, the other end of the resistor R18 is respectively connected with a pin 31 of the U21 and one end of the capacitor C22, and the other end of the capacitor C22 is connected with AGND; the 5 pins of the UA7 are connected with 1.5V voltage;
2 pins of the UA8 are connected with 2.7V voltage and are respectively connected with AGND and one end of a capacitor C43 through a capacitor C152, the other end of the capacitor C43 is connected with an AVCC5V power supply, and 1 pin of the UA8 is respectively connected with 98 pins of U21 and 98 pins of U7; the capacitor C33 is respectively connected with a pin 6 of the UA8 and one end of the resistor R38 through a resistor R36, the other end of the resistor R38 is respectively connected with a pin 7 of the UA8 and one end of the resistor R37, the other end of the resistor R37 is respectively connected with a pin 32 of the U21 and one end of the capacitor C34, and the other end of the capacitor C34 is connected with AGND; the 5 pins of the UA8 are connected with 1.5V voltage;
a pin 1 of the U is connected with a pin 71 of the U, a pin 2 of the U is respectively connected with one end of a crystal oscillator Y and one end of a capacitor C, the other end of the capacitor C is respectively connected with a pin 3 of the U at the other end of the crystal oscillator Y through the capacitor C, a pin 4 of the U is connected with a pin 70 of the U, a pin 5 of the U is connected with a pin 29 of the U, a pin 6 of the U is connected with a pin 29 of the U, a pin 14 of the U is connected with a pin 68 of the U, a pin 13 of the U is connected with a pin 67 of the U, a pin 12 of the U is connected with a pin 66 of the U, a pin 10 of the U is respectively connected with one end of a resistor R134, one end of the capacitor C and one end of the capacitor C, the other end of the resistor R134 is respectively connected with AGND and one end of a rheostat;
the 26 pin of U7 is connected with the 78 pin of U21, and the 25 pin of U7 is connected with the 79 pin of U21;
the inverter is an inverter with the power of 500W or 1000W, the input of the inverter is direct current 12V, the output of the inverter is alternating current 220V sine wave, the battery is a lithium ion battery or a lead-acid maintenance-free battery with the power of 12V and 20-100 ampere hours, and the voltage regulator is a voltage regulator which inputs 220 AC and outputs the voltage power of 0-250V and 500W.
2. The instrument for testing the transformation ratio and the polarity of the mutual inductor with the waveform display function according to claim 1, wherein the voltage stabilizing circuit comprises a REF02 chip U30, an LM358 chip UA13, a KA34063A chip U31 and a PAM2312 chip U32, 2 pins of U30 are connected with a battery through a resistor R110, 6 pins of U30 are respectively connected with one end of a resistor R111 and one end of a resistor R119, the other end of the resistor R119 is respectively connected with one end of a resistor R122 and 5 pins of UA13, the other end of the resistor R122 is respectively connected with AGND and 4 pins of U30, 7 pins of UA13 are respectively connected with 6 pins of UA13 and one end of a resistor R125, and the other end of the resistor R125 is grounded through a capacitor C127; the other end of the resistor R125 is a 2.5V voltage end; the other end of the resistor R111 is connected with a pin 3 of the UA13, a pin 1 of the UA13 is connected with a base electrode of an NPN triode Q1 through a resistor R114, a collector electrode of the triode Q1 is connected with a pin 2 of the U30, an emitter electrode of the triode Q1 is a VCC5V power supply end and is respectively connected with a pin 2 of the UA13, one end of a resistor R112, one end of a variable resistor R115 and one end of a resistor R113, the other end of the resistor R112 is a 1.5V voltage end and is respectively connected with one end of a resistor R117 and one end of a capacitor C119, and the other end of; the adjusting end of the variable resistor R115 is a 2.7V voltage end and is grounded through the capacitor C120, and the other end of the variable resistor R115 is grounded; the other end of the resistor R113 is a 3V voltage end and is respectively connected with one end of a resistor R118 and one end of a capacitor C121, and the other end of the resistor R118 and the other end of the capacitor C121 are grounded;
pin 1 of U31 is connected with anode of diode D27 and one end of inductance L2, cathode of diode D27 is connected with one end of resistance R121 and battery, the other end of resistance R121 is connected with one end of resistance R126 and 5 pins of U31, the other end of resistance R126 is grounded, the other end of inductance L2 is connected with one end of resistance R120, one end of resistance R123, 6 pins of U31 and VCC5V power end, the other end of resistance R120 is connected with 8 pins of U31, the other end of resistance R123 is connected with 7 pins of U31;
a pin 1 of the U32 is connected with a power supply end of VCC5 through a resistor R127, a pin 2 of the U32 is respectively connected with a pin 5 of the resistors R131 and U32 through a resistor R130, the other end of the resistor R131 is respectively connected with one end of an inductor L4 and one end of an inductor L5, the other end of the inductor L4 is connected with a pin 3 of the U32, and the other end of the inductor L5 is connected with a power supply end of VCC 3.3; the 4-pin of U32 is connected to the VCC5 power supply terminal.
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