JYR Intelligent Single and Three Phase Handheld Transformer Ratio Tester

JYR Intelligent Single and Three Phase Handheld Transformer Ratio Tester

Detection Principle:

Under the action of higher frequency voltage, each winding of the transformer can be regarded as a passive linear dual port network composed of distributed parameters such as linear resistance, inductance (mutual inductance), capacitance, etc. Its internal characteristics can be described by the transfer function H (j ω). If the winding deforms, the distributed inductance, capacitance and other parameters inside the winding will inevitably change, causing the zero and pole points of the equivalent network transfer function H (j ω) to change, resulting in a change in the frequency response characteristics of the network.

The amplitude frequency response characteristics of transformer windings are obtained by frequency scanning. Continuously changing the frequency f (angular frequency ω=2 π f) of the externally applied sine wave excitation source VS, measuring the ratio of the signal amplitudes of the response terminal voltage V2 and the excitation terminal voltage V1 at different frequencies, and obtaining the amplitude frequency response curves of the winding under the excitation and response terminal conditions. L. K and C respectively represent the distributed inductance, distributed capacitance, and ground distributed capacitance per unit length of the winding. V1 and V2 are the excitation terminal voltage and response terminal voltage of the equivalent network, VS is the sine wave excitation signal source voltage, RS is the signal source output impedance, and R is the matching resistance.

Technical features:

1. Fully automatic ratio measurement, which can automatically complete three-phase ratio and group testing without any parameter settings.
2. Using precision electronic devices, the measurement accuracy is stable and reliable over the long term.
3. Transformers that can measure connection groups such as Y/y, Y/d, D/y, D/d, Zn/y, Zn/d, etc.
4. Measurable three-phase transformer group and single-phase transformer polarity.
5. The total number of tap points can be set arbitrarily, and this instrument can automatically calculate and store data according to tap points. No need for repeated input and manual calculation.
6. Accurate measurement, fast speed, and continuous measurement of three-phase transformation ratio only takes a few seconds.
7. All measurement results can be stored or printed, and this instrument has a built-in power-off memory that can store measurement data for a long time and can be accessed at any time.
8. All Chinese character menus and operation prompts are intuitive and convenient.

JYR Intelligent Single and Three Phase Handheld Transformer Ratio Tester

1. Variable ratio measurement range: 1.0000~10000;
2. Group: 1~12 o'clock;
3. Accuracy: ± 0.2%;
4. Display: Large LCD screen, Chinese display;
5. Power supply voltage: AC220V ± 22V, 50Hz ± 1Hz

Operation Method:

1. Connection:

Turn off the power switch of the instrument, and connect A, B, and C of the instrument to the high voltage end and the low voltage end of the transformer.

The neutral point of the transformer is not connected to the instrument or the ground. Connect the instrument ground wire. Insert one end of the power cord into the power socket on the instrument panel, and connect the other end to an AC 220V power supply.

Caution: Do not reverse the high and low voltage connections of the transformer!

2. Turn on the power switch of the instrument, and later the main menu will appear on the LCD screen, as shown in Figure 3

At this point, you can press the "↑" key to select the function menu.

Press the 'Confirm' button to execute the corresponding function.

Note: When selecting a menu, the menu text will be displayed in reverse (with white text on a black background);

Press the button, release the button, for one key input.

3. Connection setting: After entering the wiring method setting, the LCD screen displays

At this point, press the "↑" key to select the connection method (single-phase, Yy, Y/d, Dd, D/y).

Press the 'Confirm' button to save the connection and return to the main menu