CN219085040U - Transformer capacity tester - Google Patents

Abstract

The utility model discloses a transformer capacity tester, which comprises a tester main body and a test wire, wherein the tester main body is electrically connected with a high-voltage side of a tested transformer through the test wire, a short-circuit clamp is electrically connected with a low-voltage side of the tested transformer, the tester main body comprises a processor U1, a voltage terminal JU, a test power supply output terminal JI and a printer PRT, and the processor U1 is respectively and electrically connected with a memory U2, an A/D converter U3, a NANDFLASH memory U4, the printer PRT, a keyboard KEY1, wireless WIFI, three digital power amplifiers GF1, GF2 and GF3, a display LCD1 and an interface USB1. The utility model has the advantages of 0.2 level of accuracy, flexible and convenient use, stable and reliable performance, small volume, light weight, convenient carrying, friendly interface, convenient operation, and capability of accurately and rapidly testing the actual capacity of the transformer and uploading detection data to a cloud platform or other software systems.

Description

Transformer capacity tester

Technical Field

The utility model relates to the technical field of testing, in particular to a transformer capacity tester.

Background

The existing transformer capacity tester needs to be externally connected with auxiliary equipment such as a three-phase test power supply, a voltage regulator, a current booster and the like on a transformer, is inconvenient to carry, and affects the test precision, so that the transformer capacity tester which is accurate in test result and convenient for field use is urgently needed by an electric power department.

Disclosure of Invention

The present utility model is directed to a transformer capacity tester, which solves the problems set forth in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the transformer capacity tester comprises a tester main body and a test wire, wherein the tester main body is electrically connected with a high-voltage side of a tested transformer through the test wire, a short-circuit clamp is electrically connected with a low-voltage side of the tested transformer, the tester main body comprises a processor U1, a voltage terminal JU, a test power supply output terminal JI and a printer PRT, the processor U1 is electrically connected with a memory U2, an A/D converter U3, a NANDFLASH memory U4, the printer PRT, a keyboard KEY1, wireless WIFI, three-way digital power amplifiers GF1, GF2 and GF3, a display LCD1 and an interface USB1 respectively, and the display LCD1 is used for connecting an LCD display screen and a charged capacity touch screen; the USB1 is a standard USB interface and is used for reading and writing data of the USB flash disk.

Preferably, the channels V1, V2 and V3 of the a/D converter U3 are sequentially connected with current transformers TA, TB and TC in series, and the circuits of the current transformers TA, TB and TC are sequentially connected with resistors Ra, rb and Rc in parallel, and the current transformers TA, TB and TC are respectively connected with Ia, ib and Ic of the test power output terminal JI in series, wherein the test wire is connected with a high-voltage side terminal of the tested transformer, and three-phase power signals during capacity test of the transformer are collected and converted into small-voltage signals through the current transformers TA, TB and TC to be connected into the channels V1, V2 and V3 of the analog input of the a/D converter U3.

Preferably, the V4, V5, V6 channels of the a/D converter U3 are respectively connected with the UA, UB, and UC terminals of the voltage terminal JU through resistors, the circuits of the circuits V4 and UA are connected in series with a resistor RU3, and connected in parallel with a resistor RU6 and connected in ground, the circuits of the circuits V5 and UB are connected in series with a resistor RU2, and connected in parallel with a resistor RU5 and connected in ground, the circuits of the circuits V6 and UC are connected in series with a resistor RU1, and connected in parallel with a resistor RU4 and connected in ground, wherein the voltage during capacity test is connected to the tester through JU voltage input terminals, the resistors RU1 and RU4 divide the a phase voltage, the RU2 and RU5 divide the B phase voltage, and the RU3 and RU6 divide the C phase voltage; the voltage in capacity test is divided by a voltage dividing precision resistor and then converted into small voltage signals which are connected into analog input channels V4, V5 and V6 of the A/D converter U3.

Preferably, the serial port 3 of the processor U1 is electrically connected to the WIFI; the TXD1 and RXD1 interfaces of the serial port 1 of the processor U1 are electrically connected with the printer PRT.

Preferably, SDA1, SCL1 and interrupt INT0 of I2C interface 1 of processor U1 are electrically connected to keyboard KEY 1.

Preferably, the USB interface signals usb_d+1 and usb_d-1 of the processor U1 are electrically connected to the interface USB1; the LCD controller signal line LCD1 of the processor U1 is electrically connected with the display LCD 1.

Preferably, the PWM output PWM1, PWM2, PWM3 ports of the processor U1 are respectively connected to signal inputs of three digital power amplifiers GF1, GF2, GF3, and signal outputs of the three digital power amplifiers GF1, GF2, GF3 are respectively electrically connected to the current transformers TA, TB, TC.

Compared with the prior art, the utility model has the beneficial effects that: the utility model has the advantages of 0.2 level of accuracy, flexible and convenient use, stable and reliable performance, small volume, light weight, convenient carrying, friendly interface and convenient operation, can accurately and rapidly test the actual capacity of the transformer, and can upload detection data to a cloud platform or other software systems; the utility model has reasonable design, low cost, firmness, durability, safety, reliability, simple operation, time and labor saving, fund saving, compact structure and convenient use.

Drawings

FIG. 1 is a functional block diagram of a transformer capacity tester according to the present utility model;

FIG. 2 is an electrical schematic diagram of a transformer capacity tester according to the present utility model;

FIG. 3 is a functional interface diagram of a transformer capacity tester according to the present utility model;

FIG. 4 is a diagram showing a parameter setting interface of the transformer capacity tester according to the present utility model;

fig. 5 is a diagram of a capacity test interface of the transformer capacity tester according to the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-5, an embodiment of the present utility model is provided: the transformer capacity tester comprises a tester main body and a test wire, wherein the tester main body is electrically connected with a high-voltage side of a tested transformer through the test wire, a short-circuit clamp is electrically connected with a low-voltage side of the tested transformer, the tester main body comprises a processor U1, a voltage terminal JU, a test power supply output terminal JI and a printer PRT, and the processor U1 is electrically connected with a memory U2, an A/D converter U3, a NANDFLASH memory U4, the printer PRT, a keyboard KEY1, wireless WIFI, three-way digital power amplifiers GF1, GF2 and GF3, a display LCD1 and an interface USB1 respectively;

the tester main body comprises a 32-bit high-speed ARM microprocessor, a memory which is SDRAM, a flash NORFLASH, a flash NANDFLASH, a 16-bit A/D converter, an 8-inch color liquid crystal LCD display screen, a capacitive touch screen, a standard USB interface and a printer; the tester main body program software adopts a uCOSIII operating system, a uCGUI graph and a FatFs file system; ARM micro-processing, namely selecting LPC1788FDB208, designing with low power consumption, and arranging an LCD controller, a 96K byte RAM, a 512K byte program memory, an I2C interface, an SPI interface and a UART interface in the ARM micro-processing;

the tester main body comprises a processor U1, a printer PRT, a voltage terminal JU and a test power supply output terminal JI, wherein the processor U1 is electrically connected with a memory U2, an A/D converter U3, a NANDFLASH memory U4, digital power amplifiers GF1, GF2, GF3, a keyboard KEY1, wireless WIFI, a display LCD1 and an interface USB1; the A/D converter U3 is respectively connected with secondary of the through current transformers TA, TB and TC and is connected with the voltage input terminal JU through the voltage dividing precision resistors RU 1-6;

in one embodiment, referring to FIG. 2, U1 is an ARM microprocessor, employing a low power programmable microprocessor model LPC1788FDB 208; u2 is SDRAM, and HY57V561620T-H is adopted; u4 is NANDFLASH, K9F8G08UOA is adopted; u3 is an A/D converter, a 16-bit analog-to-digital converter AD7606BSTZ with a 250K conversion rate is selected, and WiFi is a wireless WiFi module; KEY1 is a keyboard control module; PRT is a micro printer; LCD1 is an LCD display control interface connected with an 8 inch true color LCD display screen and provided with a charged touch screen; the USB1 is a standard USB interface and is used for reading and writing data of the USB flash disk;

the three current transformers TA, TB and TC adopt through-core current transformers, 0.01A-10A class 0.05 current transformers are selected for measuring the current of the transformer capacity test; the voltage terminal JU adopts four colors of yellow, green, red and black; RU1 to RU8 are precision resistors; the test line consists of three yellow, green and red strip clamp lines. The current transformer adopts a core-through structure, adopts a 1J85 permalloy iron core, has high magnetic permeability and good linearity, is additionally provided with a shielding cover, has strong anti-interference capability, and meets the level requirement of 0.05 level accuracy within the current range of 0.01A-10A. The transformer capacity tester has the advantages of small volume, light weight, portability, convenient and quick operation, safe and reliable use and suitability for field testing of various transformer capacities.

In one embodiment, the V1, V2, V3 channels of the a/D converter U3 are sequentially connected in series with current transformers TA, TB, TC, and the circuits of the current transformers TA, TB, TC are sequentially connected in parallel with resistors Ra, rb, rc, the current transformers TA, TB, TC are respectively connected in series with Ia, ib, ic of the test power output terminal JI, the current transformers TA, TB, TC are connected with the high voltage side terminal of the tested transformer through the test wire, and the three-phase power signals during the capacity test of the transformer are collected and converted into small voltage signals through the current transformers TA, TB, TC to be connected with the analog input V1, V2, V3 channels of the a/D converter U3.

In one embodiment, the V4, V5, V6 channels of the a/D converter U3 are respectively connected with the UA, UB, and UC terminals of the voltage terminal JU through resistors, the circuits of the circuits V4 and UA are connected in series with a resistor RU3, and connected in parallel with a resistor RU6 and grounded, the circuits of the circuits V5 and UB are connected in series with a resistor RU2, and connected in parallel with a resistor RU5 and grounded, and the circuits of the circuits V6 and UC are connected in series with a resistor RU1, and connected in parallel with a resistor RU4 and grounded;

the voltage input terminal JU is used for being connected with a tester to input voltage, and the output end of the voltage input terminal JU is electrically connected with the A/D converter U3 through resistors RU1-RU 6; the inputs of resistors RU1, RU2 and RU3 are connected with the UA, UB and UC output ends of a voltage input terminal JU1, and the outputs of the resistors RU1, RU2 and RU3 are connected with an A/D converter U3; one end of each resistor RU4, RU5 and RU6 is connected with the GND end, and the other end of each resistor RU4, RU2 and RU3 is respectively connected with the output end of each resistor RU1, RU2 and RU 3; resistors RU1-RU6 are used to input the divided voltage;

the power supply during capacity test is connected to the tester through a JU voltage input terminal, resistors RU1 and RU4 divide the A phase voltage, RU2 and RU5 divide the B phase voltage, RU3 and RU6 divide the C phase voltage, RU1, RU2 and RU3 select precision resistors with 7KΩ -0.05-0.5W high precision temperature coefficient of 5ppm, RU4, RU5 and RU6 select precision resistors with 3KΩ -0.05-0.25W high precision temperature coefficient of 5ppm, and the test voltage is converted into small voltage signals after being divided by the precision resistors and is connected to analog input V4, V5 and V6 channels of the A/D converter U3; during capacity test, three-phase current signals of a power supply are collected and converted into small voltage signals through TA, TB and TC through a core-penetrating current transformer, and the small voltage signals are connected into analog input V1, V2 and V3 channels of an A/D converter U3; the processor U1 reads the digital signals converted by the A/D converter U3, calculates the tested electric parameters and transformer capacity, displays the electric parameters and the transformer capacity on an LCD according to requirements, and can also be connected with the mobile phone APP through the WIFI module to read data.

In one embodiment, the serial port 3 of the processor U1 is electrically connected to the wireless WIFI; the TXD1 and RXD1 interfaces of the serial port 1 of the processor U1 are connected with the printer PRT.

In one embodiment, SDA1, SCL1 and INT0 of I2C interface 1 of the processor U1 are all electrically connected to the keyboard KEY 1.

In one embodiment, the USB interface signals USB_D+1 and USB_D-1 of the processor U1 are electrically connected with the interface USB1; the LCD controller signal line LCD1 of the processor U1 is electrically connected with the display LCD 1.

In one embodiment, the PWM output PWM1, PWM2, PWM3 ports of the processor U1 are respectively connected to the signal inputs of three digital power amplifiers GF1, GF2, GF3, and the signal outputs of the three digital power amplifiers GF1, GF2, GF3 are respectively electrically connected to the current transformers TA, TB, TC.

In one embodiment, referring to FIG. 3, the functions of the tester are displayed in the form of icons, clicking on a different icon, and the tester implements the corresponding function.

The operation flow of the transformer capacity comprehensive tester is as follows:

step one: the on-site wiring is realized, the low-voltage side voltage binding post a B C of the transformer is reliably short-circuited by a short-circuit wire, one end of the test wire is respectively connected with the power source output terminal and the voltage terminal of the tester according to colors, the A binding post of the high-voltage side of the Huang Xianga transformer is connected with the B binding post of the high-voltage side of the transformer by a green wire, and the C binding post of the high-voltage side of the transformer is connected with the red wire by a clamping way.

Step two: the on-site tester turns on the tester power switch, and the tester displays the interface of FIG. 3, waiting for the tester to select a function.

Step three: the field tester clicks the capacity test icon of the tester, the tester displays the interface of fig. 4, inputs corresponding contents in the upper left corner parameter input area, and clicks the start test after the input is completed.

Step four: the tester enters a testing state, the tester displays the interface of fig. 5, and the testing data are displayed in the corresponding data fields; the on-site tester clicks a button of a functional box on the right side of the tester to complete a corresponding function, such as clicking a 'print result', the printer prints out a test result report, clicking a 'save result', the test data is saved in a memory, clicking a 'exit', and returning to the functional interface of fig. 3.

Step five: the field tester clicks other function icons of the tester to implement corresponding function tests, such as: harmonic measurement, waveform display, data browsing, etc.

The utility model can measure the actual capacity of the transformer on site, has small volume, light weight, convenient carrying, convenient and quick operation and safe and reliable use.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

1. The transformer capacity tester, its characterized in that: the tester comprises a tester main body and a test wire, wherein the tester main body is electrically connected with a high-voltage side of a tested transformer through the test wire, a short-circuit clamp is electrically connected with a low-voltage side of the tested transformer, the tester main body comprises a processor U1, a voltage terminal JU, a test power output terminal JI and a printer PRT, and the processor U1 is electrically connected with a memory U2, an A/D converter U3, a NANDFLASH memory U4, the printer PRT, a keyboard KEY1, wireless WIFI, three digital power amplifiers GF1, GF2, GF3, a display LCD1 and an interface USB1 respectively.

2. The transformer capacity tester of claim 1, wherein: the V1, V2 and V3 channels of the A/D converter U3 are sequentially connected with current transformers TA, TB and TC in series, the circuits of the current transformers TA, TB and TC are sequentially connected with resistors Ra, rb and Rc in parallel, and the current transformers TA, TB and TC are respectively connected with Ia, ib and Ic of the test power supply output terminal JI in series.

3. The transformer capacity tester of claim 2, wherein: the V4, V5 and V6 channels of the A/D converter U3 are respectively and electrically connected with UA, UB and UC terminals of the voltage terminal JU through resistors, a resistor RU3 is connected in series with the circuits of the circuits V4 and UA, a resistor RU6 is connected in parallel with the circuits of the circuits V5 and UB, a resistor RU2 is connected in series with the circuits of the circuits V5 and UB, the circuits of the circuits V6 and UC are connected in parallel with a resistor RU1 and connected in parallel with the circuits of the circuits V6 and UC and connected in parallel with the resistor RU4 to the ground.

4. A transformer capacity tester as claimed in claim 3, wherein: the serial port 3 of the processor U1 is electrically connected with the wireless WIFI; the TXD1 and RXD1 interfaces of the serial port 1 of the processor U1 are connected with the printer PRT.

5. The transformer capacity tester of claim 4, wherein: SDA1, SCL1 and INT0 of the I2C interface 1 of the processor U1 are connected with the keyboard KEY 1.

6. The transformer capacity tester of claim 5, wherein: the USB interface signals USB_D+1 and USB_D-1 of the processor U1 are connected with the interface USB1; the LCD controller signal line LCD1 of the processor U1 is connected with the display LCD 1.

7. The transformer capacity tester of claim 6, wherein: the PWM output PWM1, PWM2 and PWM3 ports of the processor U1 are respectively connected with the signal inputs of three paths of digital power amplifiers GF1, GF2 and GF3, and the signal outputs of the three paths of digital power amplifiers GF1, GF2 and GF3 are respectively connected with the current transformers TA, TB and TC in series.

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