In the production process of semi-finished and finished power transformers, before the newly installed transformers are put into operation, and according to the preventive testing regulations of the Ministry of Electric Power, transformers are required to undergo turns ratio or voltage ratio tests. The traditional variable ratio bridge is cumbersome to operate, the readings are not intuitive, and necessary conversions need to be made. During testing, it can only be carried out on a single-phase basis, resulting in low work efficiency. This sectionYHBV-C fully automatic ratio group tester (charging function)Overcoming the shortcomings of traditional variable ratio bridge testing. The screen adopts a large color LCD display screen, with Chinese menu prompts and easy and intuitive operation. It can complete the three-phase transformation ratio test in one go, with fast testing speed, high accuracy, and complete protection functions.

1. Before using this instrument, be sure to read this manual carefully.

2. The operator of the instrument should have knowledge of using electrical equipment or instruments.

3. The instrument should be reliably grounded during use.

4. This instrument is powered by an internal lithium-ion battery or AC220V ± 10% 50/60HZ ± 1HZ

5. The output voltage of the instrument is high, attention should be paid to safety to prevent electric shock.

6. This instrument can be used both indoors and outdoors, but should be avoided from harsh environments such as rain, corrosive gases, excessive dust, high temperatures, and direct sunlight.

7. Instruments should avoid severe vibrations.

8. The maintenance, care, and adjustment of instruments should be carried out by professionals.

9. The yellow, green, red, and black colors of the test clamp correspond to A, B, C, and O of the transformer, respectively. Do not connect the high and low voltage cables in reverse.

10. When measuring single-phase, only use yellow and black wire clamps, do not use them incorrectly, and unused test clamps should be suspended.

1. The testing range is wide, up to 0.9-10000.

2. Fast testing speed, completing three-phase testing in 11 seconds.

3. Can test CT, PT, CVT, and Z-connected transformers.

4. It has the functions of blind variable ratio testing and group testing.

5. Multiple measurement methods make fault diagnosis easier.

6. No power failure clock and date display, data storage of 480 sets, no loss of power failure data.

7. Large screen color LCD display with clear and easy to read data. RS485 communication interface and USB storage interface.

8. The instrument has high and low voltage reverse connection protection function, transformer short circuit and turn to turn short circuit protection function, and power supply misconnection 380V protection function.

9. Thermal printer printing function, fast and silent.

10. Small size and light weight.

Instrument Introduction

The panel of the instrument is shown in Figure 1

Figure 1

1. Display screen: Display operation menu and test results.

2. Button:

Function keysThe four function keys F1, F2, F3, and F4 correspond to the functions displayed above, and press the corresponding keys to execute the corresponding prompts.

reset keyPress this button to reset the entire machine to its initial state.

decimal tab: Enter the decimal point.

numeral key: Enter numerical values.

3. Low voltage input terminal: yellow, green, red, and black 4-color connection sockets, respectively for the a, b, and c phases and neutral point o, connected to corresponding colored cables. The other end of the cable has a yellow, green, red, and black 4-color clamp, corresponding to the a, b, and c phases and neutral point o on the low voltage side of the tested transformer.

4. High voltage output terminal: yellow, green, red, and black 4-color connection sockets, respectively for A, B, and C phases and neutral point O, connected to corresponding color cables. The other end of the cable has yellow, green, red, and black 4-color clamps, corresponding to A, B, and C phases and neutral point O on the high voltage side of the tested transformer.

5Protect the grounding pole.

6. Switch:（AC220V 2A) is the power switch for the entire machine. (Note: Be sure to turn off the main switch when the device is not in use to prevent the internal battery from running out of power.).）

7. AC/DC is an AC/DC switching switch.

8. USB interface: used to store data on a USB drive

9. RS485: Used for transmitting data

10. Printer: Print test results.

precautions

1. When the power input is greater than 300V, an alarm should be triggered, and the power input port should be checked in a timely manner.

2. The output voltage of the instrument is 160V. Safety precautions should be taken to prevent electric shock.

3. For a transformer with 19 levels of on load tap changer, the values for 9, 10, and 11 taps are the same. When the instrument inputs the tap type, it should be set to 17. After 12 taps, the instrument displays that the tap position is 2 points smaller than the actual position.

4. The setting of the tap position of this instrument is based on the high-voltage side voltage regulation design, assuming that tap 1 is the highest voltage gear. If the voltage is reversed or the tap switch is on the low-voltage side of the transformer, the displayed tap position and the actual tap position will be inverted.