ITC-01 intelligent automatic transformer calibrator
ITC-01 intelligent automatic transformer calibrator comprehensive application of computer, electronics, communications and other advanced technologies, while maintaining the accuracy and stability of the premise, in terms of the degree of intelligence than the conventional transformer calibrator has been further improved . The design of the instrument introduced some new ideas, adopted a number of new technologies, such as visualization technology, allowing users to use the instrument more convenient, fast and efficient.
ITC-01 intelligent automatic transformer calibrator can not only test the conventional electromagnetic current-voltage transformer, but also can test the analog output of the electronic current-voltage transformer, powerful, to solve the shortcomings of a single conventional calibrator function . The calibrator can be 0.1 to 10 of the transformer for steady-state accuracy verification.
The use of ITC-01 intelligent automatic transformer calibrator can be calibrated personnel from tedious duplication of calibration work to liberate, improve the transformer calibration efficiency and production efficiency.
2 technical indicators
2.1 reference standard
LGB / T 20840.7-2007 electronic voltage transformers
LGB / T 20840.8-2007 Electronic Current Transformer
LGB1207-2006 voltage transformer
LGB1208-2006 current transformer
LJJG 313-1994 Measurement of current transformer testing procedures
Measurement procedures for voltage transformers for measurement
Ljjg1021-2007 power transformer testing procedures
LJJGG169-1993 transformer calibrator verification procedures
2.2 Conditions of use
L working temperature: -15 ℃ ~ 55 ℃；
L Storage temperature: -25 ℃ ~ +85 ℃；
L Relative humidity: 0 ~ 95%, no condensation;
2.3 Arbitration Baseline Environment
L working temperature: 23 ℃ ± 2 ℃；
L Relative humidity: 45% ~ 75%:
2.4 technical parameters
L calibration input: analog
L analog measurement limit: ± 10V
L sampling accuracy: 0.02%
L Input impedance: 1MΩ
L standard transformer accuracy: 0.02 level
L ratio difference resolution: 0.01%
Angle difference resolution: 0.1 points
3 system programs and trial instructions
3.1 overall program
The following figure shows the overall scheme of the ITC-01 intelligent automatic transformer calibrator. It includes: current and voltage power supply module for testing, calibrator module （including standard transformer and test module）， and host computer.
Figure 3.1-2 ITC-01 intelligent automatic transformer calibrator
3.2 test current voltage source
Figure 3.2-1 is a front view of the verification current voltage source module, where 1 is the coarse adjustment knob, 2 is the fine adjustment knob, 3 is the test power switch. 4 for the current source and voltage source selection switch, the switch is selected upward output voltage source, the downward selection of calibrator output current source.
Figure 3.2-2 is the rear view of the verification current voltage source module, where AC220V is the terminal of 220V, 50Hz power supply to be externally input, the output current has two ranges of 5A and 100A, L is the common of the two gears . Uout terminal for the voltage source output terminal, the terminal for the aviation plug, contains two core signal pin. “〨” end of the instrument is connected to the ground terminal. FOUSE for the fuse.
Wiring Instructions: Measure the current of 1A and 5A of the CT using 5A stalls output current terminal; measure the primary current of 5A above the use of 100A stalls output current terminal.
Figure 3.2-1 Calibration power module front view
Figure 3.2-2 Calibration power module rear view
Figure 3.3-1 is the front of the calibrator. The purple square frame on the left in the figure is the selected gear of the standard current transformer. It consists of 1A, 5A, 20A, 50A, 100A and other gears. L is common for each gear end.
The upper right of the current selection area is the selected gear of the standard voltage transformer, which is composed of 57.7V, 100V, 200V, 300V and 600V files. The lower right of the current selection area is the secondary signal input terminal U1 of the tested PT. According to the test current transformer current range of different needs to select the current select gear, according to the test voltage transformer voltage range of different needs to select the voltage select gear.
The middle of the LCD interface for the test interface, the transformer can be achieved calibration parameters set, waveform display and accuracy display.
Figure 3.3-1 calibrator front
Figure 3.3-2 calibrator back
Figure 3.3-2 is the back of the calibrator. The Uin terminal in the figure verifies the voltage Uout output by the power supply, and is specially shielded twisted pair connection. AC220V AC 220V input terminals, Fuse fuse.
The calibrator standard transformer high permeability magnetic material, the structure is reasonable and reliable, mainly used for testing and standard current and voltage transformer current ratio or voltage ratio of the same or different current transformer with calibration flexibility .
The standard transformer and the secondary transformer output signal sent to the secondary calibration module, the calibration module to complete the signal sampling, A / D conversion, signal upload to the host computer and other functions.
The following figure 3.3-3 is the schematic diagram of the calibration module built-in calibration module, the module uses high-performance digital signal processor and USB-based communication, signal acquisition, A / D conversion, signal upload to the host computer Features.
Calibration module is mainly the data processing, storage, waveform analysis, display, printing, using visualization software to achieve data processing and analysis.
Figure 3.3-4 Intelligent Automatic Transformer Calibrator PC processing system interface
The above figure 3.3-4 is the VB interface of the intelligent automatic Tester calibrator PC processing system. In this interface, you can set the ratio of the standard transformer and the measured transformer, and see the transformer signal waveform, the ratio difference and the angle Poor, current source output current size, transformer secondary voltage signal size.
If the test is CT, then select the test CT button; if the test is PT, then select the test PT button, as shown below:
If the ratio of CT to be measured is 1A: 0.1765V, then the standard mutual selection “1A” in Figure 3.3-1 will be applied. The standard CT settings in Figure 3.3-6 are as follows: rated primary current “1A”， rated secondary voltage “4V” （the default is 4V）。 The measured CT settings are: rated primary current “1A” and rated secondary voltage “0.1765V”， as shown in Figure 3.3-6.
Note: The rated primary current selection of Figure 3.3-6 Standard CT should be the same as the standard CT selection of Figure 3.3-1.
If the CT ratio to be tested is 5A: 3.53V, the standard “5A” file in Figure 3.3-1 is selected. The standard CT settings in Figure 3.3-6 are: rated primary current “5A” and rated secondary voltage “ 4V ”（the default is 4V）。 The measured CT settings are: rated primary current“ 5A ”and rated secondary voltage“ 3.53 V ”。
If the measured PT ratio is 100V: 5V, the standard “100V” file in Figure 3.3-1 is selected. The standard PT settings in Figure 3.3-7 are: rated primary voltage “100V” and rated secondary voltage “4V ”（Default is 4V）； PT set to be tested: rated primary voltage“ 100 ”， rated secondary voltage“ 5 V ”。
Note: The rated primary current selection of Figure 3.3-7 standard PT should be the same as the standard PT selection of Figure 3.3-1.
After setting the parameters, press the “Set Parameters” button, which determines the ratio between the standard CT and the measured CT.
1） First, adjust the current source current to zero;
2） Select the working points （1%, 5%, 20%, 50%, 80%, 100%, 120%） to be tested;
3） Press the “test” button, start adjusting current source, slowly rising;
4） When the test points after each test is completed, press the “Add” button to choose to save, save the product number can be set;
5） Press the “Report” button, you can automatically save the data reported, can generate EXCEL form for easy access, printing, etc .;
6） At the bottom of the data management interface, there is “Record Data Selection Area”， you can select the number according to “left button”， “right button”， “select the number to be deleted or changed, Change ”button to delete or change data;
7） Press the “BACK” button to return to the main calibration screen.
Corresponding parameter set not found, please add it in property template of background