Transformer comprehensive tester

one.Transformer comprehensive testerDesign purpose

Designed for protection and measurement purposesCT/PTPerform automatic testing, suitable for both laboratory and on-site testing.

two.Transformer comprehensive testerreference standard

GB 1207-2006TheGB 1208-2006

threeMain features

•support detectionCTandPT

•satisfyGB1207TheGB1208Waiting for regulatory requirements.

No need for external auxiliary equipment, all testing items can be completed on a single machine.

•Equipped with a miniature fast printer, it can directly print test results on site.

•Easy to operate with intelligent prompts, making it easier for users to get started..

•Large screen LCD, graphical display interface.

•Automatically given according to regulationsCT/PT(Excitation) inflection point value.

•Automatically given5%and10%Error curve.

•Can be saved3000Group testing data, not lost after power failure.

•supportUData transfer can be done through standard methodsPCRead and generateWORDreport.

•Compact and lightweight ≤22KgVery conducive to on-site testing.

4The main testing functions of the tester are: (see table)1）

table1

five.Main technical parameters of the tester: (See table)2）

table2

5.1Requirements for working conditions

input voltage220Vac±10%Rated frequency50Hz；

The tester should be powered by a power socket with protective grounding. If there is a problem with the connection of the protective ground or if the power supply is not isolated from the ground, the tester can still be used, but we do not guarantee safety;

The environmental temperature corresponding to the parameter is23℃±5℃；

The guaranteed value is valid for one year after factory calibration. 、

six. Touchscreen transformer calibrator?Product hardware structure

6.1Panel structure:(Image)1）

picture1

6.2Panel annotation:

1 —— Equipment grounding terminal

2 ——UDisk transfer storage port

3 ——Printer

4 ——LCD display

5 ——Overcurrent protection (power) switch

6 ——Host power switch

7 ——P1TheP2：CTtransformation ratio/During polarity testing, the high current output port

8 ——S1TheS2：CTtransformation ratio/During polarity testing, the secondary side access port

9 ——K1TheK2：CT/PTDuring the excitation (volt ampere) characteristic test, the voltage output port,

Voltage methodCTtransformation ratio/During polarity testing, the secondary access terminal

10 ——ATheX：PTtransformation ratio/When polarized, the primary side access port

11 ——aThex：PTtransformation ratio/When polarity is reached, the secondary side access port

12 ——L1TheL2Voltage methodCTtransformation ratio/During polarity testing, one access terminal

13 ——D1TheD2Secondary direct resistance test

14 ——Host power socket

seven.Introduction to operation mode and main interface

7.1Main menu (See figure)2）

Default entry after booting upCTTesting,CTThe main menu for testing includes "excitation", "load", "direct resistance", "variable ratio polarity", "angle difference ratio", "AC withstand voltage", and "primary current" , "Data Query", "System Settings" The“PT”10Select options.

PTThe main menu for testing includes "excitation", "load", "direct resistance", "variable ratio polarity", "angle difference ratio", "AC withstand voltage", and "data query" The“CT”8Select options.

eighty percent.CTtest

CTExcitation (volt ampere) characteristic test

inCTIn the main interface, click on "Voltage current characteristics" After selecting the option, you will enter the testing interface as shown in the figure4.

（1）Parameter settings:

Excitation current: setting range（0—20A）If the current output of the instrument reaches the set value during the experiment, the current will automatically stop rising to avoid damaging the equipment. Usually, the current setting value is greater than or equal to1AYou can test the inflection point value.

Excitation voltage: setting range（0—2500V）The set voltage for the instrument output is usually slightly higher than the inflection point voltage, which can make the proportion displayed on the curve more coordinated. If the voltage is set too high, the curve will be closer to the curveYAxis, voltage set too low, curve close toXAxis. If the voltage reaches the set value during the experiment, the boosting will automatically stop to avoid damaging the equipment.

（2）Experiment:

The wiring diagram can be found on the interface of the testerK1TheK2For the voltage output terminal, during the testK1TheK2Connect the transformers separatelyS1TheS2All terminals of the transformer should be disconnected. After checking the wiring is correct, turn on the power switch and select the "Start" option to start the test.

During the experiment, the white status bar above will prompt "testing in progress", and the tester will start to automatically increase the voltage and current. After the tester completes the detection, the experiment will end and the volt ampere characteristic curve will be drawn.

Attention: Image4The "Calibration" function is mainly used to view the output voltage and current values of the equipment, and is not used for transformer function testing. Please refer to Appendix 1 for details.

picture4，CTExcitation characteristic testing interface

2）Operating instructions for volt ampere characteristic (excitation) test results

After the experiment, the volt ampere characteristic test curve and data were displayed (see figure)5）. The various operation functions on this interface are as follows:

hit Print: After clicking "Print", print the volt ampere characteristic (excitation) curve and data successively, making it convenient for users to make reports. Simultaneously reducing the frequency of replacing printing paper, saving time, and improving efficiency.

Excitation data: Click "Previous" Next page "can be used to flip up and down data.

guarantee Save: Click on the "Save" option and press to save the current measured data. After successful saving, the status bar will display "Saved". And it can be viewed in the data query menu.

Error Curve: After selecting the "Error Curve", the screen will display the settings of the error curve for the volt ampere characteristic test. After setting the parameters, select5%or10%The error curve is the calculated error curve.

Custom printing: The program will follow the instructions in the table10Print the current value.

The following four items are the settings for calculating the error curve:

rated load ：CTRated load on the secondary side.

Rated secondary ：CTRated current on the secondary side

ALFAccurate limit coefficient, such as the measured valueCTThe nameplate is“5P10”， “10”It is the limiting coefficient.

5%: Automatically calculated5%Error curve data and display error curve.

10%: Automatically calculated10%Error curve data and display error curve.

CTVariable ratio polarity test

enterCTAfter selecting the polarity menu, first choose the testing method for the casingCTWhen the impedance is too high to measure the transformation ratio, or when the wiring position is too high to carry heavy current wires, please choose the voltage method.

1Current method for polarity testing of variable ratio.

1）Parameter settings:

Enter the testing interface as shown in the figure6.

Primary side test current: 0 ～600ATesting equipmentP1TheP2High current output from the terminal;

Secondary side rated current:1Aor5A.

2）Experiment:

CTOne side connectionP1TheP2，CTSecondary side connectionS1TheS2The secondary winding that is not tested should be short circuited. After setting the rated current and number of the secondary side, close the power switch, select the "Start" option, and the test will begin.

The white status bar above will prompt 'Testing' until the test is completed and the automatic testing interface is exited, or press”停止”Artificially suspending the experiment, the device will automatically stop the experiment after the test is completed. After the experiment is completed, the results of the variable ratio polarity test will be displayed. can choose Save " Use the "Print" and "Return" options to proceed to the next step.

The same color terminal of the instrument itself is the same phase terminal, that isP1pick upCTofP1，S1pick upCTofS1At that time, the polarity test result was negative polarity.

2Voltage method variable ratio polarity test.

1）Parameter settings:

inCTIn the main interface, select "Variable Ratio Polarity" and enter the testing interface as shown in the figure7, Set up

Secondary side rated current:1Aor5A.

2）Experiment:

CTOne side connectionL1TheL2，CTSecondary side connectionK1TheK2The secondary winding that is not tested does not need to be short circuited. After setting the rated current and number of the secondary side, close the power switch, select the "Start" option, and the test will begin.

8.3TheCTAngle difference ratio test

CTThe angle difference ratio test, like the variable ratio polarity test, can choose between two testing methods: current method or voltage method.

1）Parameter settings:

inCTIn the main interface, select "Angle difference ratio difference" and enter the testing interface (as shown in the figure)8）(Note: The actual rated transformation ratio value on the transformer nameplate should be referred to for setting)

Rated once:CTRated current at one time:0～25000A

Rated secondary:5A/1A.

Rated load: Transformer capacity.

Actual load: According to the rated load setting, two states of full load and light load can be automatically calculated (light load refers to full load)25%).

2）Experiment:

CTOne side connectionP1TheP2，CTSecondary side connectionS1TheS2After setting the parameters and checking the wiring for accuracy, turn on the power switch, select the "Start" option, and the experiment will begin.

During the experiment, the experiment can be terminated by pressing the controller. After the test is completed, the phase angle difference between the primary and secondary sides will be automatically calculated, and the percentage difference between the actual measured variable ratio and the user set rated variable ratio will be determined. can choose Save " Use the "Print" and "Exit" options to proceed to the next step. 、

5TheCTSecondary circuit test

1）Parameter settings:

inCTIn the main interface, select "Secondary Circuit" and enter the testing interface (as shown in the figure)9），

Set the current value:0～600A.

2）Experiment:

CTOne side connectionP1TheP2，CTConnect the secondary side to the secondary load. After setting the current flow, close the power switch, click the "Start" option, and the experiment will start. The current holding time will be displayed on the progress bar0～200A:maintain10minute; greater than200A～300A: Maintain2minute;greater than300A: Maintain3second).

CTAC voltage withstand test

1）Parameter settings:

inCTIn the main interface, select "AC withstand voltage" and enter the testing interface (as shown in the figure)10），

Set the set voltage value:0～2500V.

2）Experiment:

testedCTSecondary side short circuit and tester voltage output portK2Connection, voltage output port on the other endK1Connect the transformer housing. After checking the wiring, close the power switch and select The "Start" option starts boosting when pressed, and the default voltage holding time is1During the testing process, the instrument detects the leakage current between the secondary winding of the transformer and the casing in real-time. If a rapid increase in current is detected, it will automatically return to zero and the page will display "unqualified".

7TheCTLoad test

Parameter settings:

inCTIn the main test interface, select to enter the "Secondary Load" test interface (as shown in the figure)11），

Set the rated current on the secondary side:1Aor5A.

Line resistance: only used when testing the load box (set according to the load box nameplate)

Experiment:

The tester'sK1TheK2Connect the tested load (load) to the voltage output terminal of the testerK1TheK2After checking the wiring, select "Start" to start the test. After the test is completed, the load test results will be displayed. You can choose Save " Use the "Print" and "Exit" options to proceed to the next step.

8Direct resistance test:

1）School Zero:

inCTIn the main test interface, select to enter the "DC Resistance" test interface (as shown in the figure)12）Before the experiment, the testing wires should be zeroed firstCTSelect from the menu displayed on the main interface DC resistanceTest item, enter the direct resistance test interface and select "zero calibration",Before zeroing, connect the wire clamp of the test wire (short-circuit the test wire), and then perform zeroing. After zeroing is completed, the interface will prompt "zeroing completed".

2）Experiment:

After the zero calibration is completed, refer to the diagram24Connect the test line and the testerD1TheD2Connect the tested winding and select Start " Press the key to start the test, and after the test is completed, the direct resistance test result will be displayed, which can be selected Save " Use the "Print" and "Return" options to proceed to the next step.

9.PTtest

1ThePTExcitation characteristic test

1)Parameter settings

inPTIn the main testing interface, select to enter the "Voltage Current Characteristics" testing interface (as shown in the figure)13），

Excitation current（0～20A）The output current is the set current output by the instrument. If the current reaches the set value during the experiment, the current will automatically stop rising. usually1AThe inflection point value can be tested.

Excitation voltage:100V、100/√3、100/3The150VThe220VThe350V.

2）Experiment:

The tester has a voltage output terminal, and during the test, it willK1TheK2Connect the transformers separatelyaThexThe zero terminal of the primary winding of the voltage transformer is grounded. After checking the wiring is correct, close the power switch and select "Start" After selecting the option, testing begins.

During the experiment, the white status bar above will prompt "testing in progress", and the tester will start to automatically increase the voltage and current. After the tester completes the detection, the experiment will end and the volt ampere characteristic curve will be drawn.

3）ThePT(Excitation) Test Results Operating Instructions

Please refer toCTTest result explanation

2ThePTVariable ratio polarity test

1）Parameter settings: The test interface is shown in the figure15.

once:0～2500V.

secondary:100V、100/√3、100/3The150VThe220V.

2）Start the experiment:

PTOne side connectionATheX，PTSecondary side connectionaThexAfter setting the rated voltage and number of the secondary side, close the power switch and select Press the "Start" option on the controller to start the experiment.

The white status bar above will prompt "testing in progress" until the test is completed and the test interface is exited, or the controller is pressed to manually terminate the test. After the test is completed, the results of the variable ratio polarity test will be displayed. can choose Save " Use the "Print" and "Exit" options to proceed to the next step.

The same color terminal of the instrument itself is the same phase terminal, that isApick upPTofA，Xpick upPTofXAt that time, the polarity test result was negative polarity.

3ThePTAngle difference ratio test

1）Parameter settings:

inPTIn the main test interface, select to enter the "Angle Difference Ratio Difference" test interface (as shown in the figure)16）(Note: The actual rated transformation ratio value on the transformer nameplate should be referred to for setting)

Rated once: 3～500KV

Rated secondary:100V、100/√3、100/3The150VThe220V

Rated load: Transformer capacity.

Actual load: According to the rated load setting, two states of full load and light load can be automatically calculated (light load refers to full load)25%).

2）Experiment:

PTOne side connectionATheX，CTSecondary side connectionaThexAfter setting the parameters, select the "Start" option and press the controller to start the experiment.

During the experiment, the experiment can be terminated by pressing the controller. After the test is completed, the phase angle difference between the primary and secondary sides will be automatically calculated, and the percentage difference between the actual measured variable ratio and the user set rated variable ratio will be determined. press Print "to print out the test results, Save "will save the test results, 'Exit' returns to the parameter settings menu. If all displays are9If the error exceeds the display range, please check the set value.

5ThePTAC voltage withstand test

1）Parameter settings:

inPTIn the main testing interface, select to enter the "AC Voltage Endurance" test interface (as shown in the figure)17），

Set the set voltage value:0～2500V.

2）Experiment:

testedPTSecondary side short circuit and tester voltage output portK2Connection, voltage output port on the other endK1Connect the transformer housing. After checking the wiring, close the power switch and select The "Start" option starts boosting when pressed, and the default voltage holding time is1During the testing process, the instrument detects the leakage current between the secondary winding of the transformer and the casing in real-time. If a rapid increase in current is detected, it will automatically return to zero and the page will display a test abnormality.

6ThePTLoad test

1）Parameter settings:

inPTIn the main testing interface, select to enter the "Load" testing interface (as shown in the figure)18），

Set the rated secondary voltage value:100V、100/√3、100/3The150VThe220V.

2）Experiment:

The tester'sK1TheK2For the voltage output terminal, refer to the diagram35Connect the tested load (load) to the tester through wiringK1TheK2After checking the wiring, turn on the power switch and select "Start" to start the test. After the test is completed, the load test results will be displayed, which can be selected Save " Use the "Print" and "Exit" options to proceed to the next step.

7Direct resistance test:

Please refer toCTDirect resistance test.

ten.data query

inCT/PTIn the main test interface, select to enter the "Data Query" test interface (as shown in the figure)19）According to the needs, select testing options such as "excitation", "load", "direct resistance", "variable ratio polarity", "angle difference ratio difference", "exit", etc. After selecting the testing item, the new test results saved under that item in the instrument will be displayed. You can choose Previous Page Perform corresponding operations on the "Next", "Save", "Exit", and "Clear" options.

When transferring, plug inUDisk to tester communication port“USB”Click 'Save' to transfer the test records displayed on the current pageUInside the plate. Each record takes approximately2After the transfer is completed, the interface will prompt "Transfer completed".

eleven.PCInstructions for using machine operation software

Open the "Voltage Ampere Characteristics" folder and select "Open"“VATeXing.exe”

Operating software, as shown in the figure20It is the upper computer operation software.

11.2 In“VATeXing.exe”In the operating software, select the type of transformer below“CT”Or“PT”，

The application language is either "Chinese" or "English".

11.3To generate a report format file, it is necessary to load the test result data. The specific operation method is as follows:

a）To store experimental dataUConnect the disk to the computer.

b）In the picture20Select the option to open 'Select File' and the following image will appear21Operation window, as shown in the figure21You can load the required files as needed.

c）Experimental result data explanation:“A”The data starting with is the excitation characteristic result data“B”The data at the beginning is the polarity result data of the transformation ratio“C”The data starting with is the load result data“D”The data at the beginning is the direct resistance result data. To“E”The data at the beginning is the result data of angle difference ratio.

11.4 After loading the data, select "OK" to display the image22After setting the corresponding parameters in the upper right corner of the interface, select "Generate Error Curve" to complete the loading of all test results.

11.5 After loading everything, you can choose to "save" or print the result data as needed.

11.6 Select the 'Save' option, thenWORDThe results are displayed in the form shown in the figure23.

11.7 To continue loading test result data, please clear the last loaded data first.

picture23

Appendix record

Appendix 1: Calibration testing method (usingCTFor example)

1）Parameter settings:

enterCTAfter entering the "excitation" test interface, select the "calibration" test interface and set the excitation current value:0.1A～5A;Excitation voltage value:1V～2500V.

2）Start:

Reference diagram for voltage calibration test24Perform wiring; After setting the measured voltage, close the power switch and select Start "option, press the controller to start the experiment, and once the experiment reaches the set value, the output voltage will be maintained/The current value is used for detection.

Reference diagram for current calibration test25Connect the wires and set the voltage slightly higher than the current setting（A）*Load (Ω), set the measured current/After the voltage value is reached, close the power switch and select Start "option, press the controller to start the experiment, and once the experiment reaches the set value, the output current will be maintained/The voltage value is used for detection.

Appendix 2: After sales Service Commitment This product comes with a one-year warranty and lifetime maintenance.

Appendix 3: Error Curve Explanation

The current multiple calculated based on the excitation current and voltage on the secondary side of the transformer（M）Allowing secondary loads（ZII）Between them5%、10%The data of the error curve can also be used to determine whether the transformer protection winding is qualified:

1）If the actual load measured near the theoretical current multiple is greater than the theoretical load value on the transformer nameplate, it indicates that the transformer is qualified as shown in the figure26Data explanation;

2）The actual current multiple measured near the theoretical load is greater than the theoretical current multiple on the transformer nameplate,It also indicates that the transformer is qualified as shown in the figure26Data explanation;

The secondary load of the protective current transformer should meet the requirements5%The requirement for error curve is that as long as the secondary actual load of the current transformer is less than5%The allowable load of the error curve, at rated current multiples, the measurement error of a qualified current transformer is5%Within. The larger the secondary load, the easier it is for the iron core of the current transformer to saturate, and the smaller the allowed current multiple. Therefore,5%The error curve isn/ZLThe curve is shown in the graph9The curve shown. in the figure26As shown in the example (for the measured protection)CTfor5P10 20VA）Among them:5For accuracy level (with an error limit of5％），PIn the form of a transformer (protection level),10To accurately limit the coefficient（10Times the rated current),20VAIndicates the rated secondary load (capacity). The current multiple is10.27Double (approaching)10When the load is doubled, the allowed secondary load is27.19Ω,Greater than thisCTRated load20VA(20VA/1=20Ω),The data can be used to determine that the transformer is qualified. In addition, the secondary load is19.58Ω(approach20Ω)The allowed secondary load is27.19Ω,Greater than thisCTRated load20VA(20VA/1=20Ω),The data can be used to determine that the transformer is qualified. In addition, the secondary load is19.58Ω(approach20Ω)When, the allowed current multiple is12.85Multiple, greater than thatCTMultiple of rated current（10By using this data, it can also be determined that the transformer is qualified. In fact, as long as either of these two key points is identified, it is possible to determine whether the measured transformer is qualified.

if10%The general methods for errors that do not meet the requirements are:

Increase the interface area of the secondary cable (reduce the secondary impedance)

Series connection of current transformers of the same type and ratio (reducing the excitation current of the transformer)

Switch to windings with higher volt ampere characteristics (increased excitation impedance)

Increase the current transformer ratio (increase excitation impedance)

Error curve calculation formula:

M =（I*P）/N ZII =（U-（I*Z2））/(K*I)

IcurrentUvoltage

N=1 (1Arated current) Icurrent

N=5 (5Arated current) Z2 CTSecondary impedance

P=20（5%Error curve ）K=19（5%Error curve.1A 5ARated current)

P=10（10%Error curve ）K=9（10%Error curve.1A 5ARated current)