During production process of the semi-final product and the final product of the power transformer and before the newly installed transformer is put into operation, the transformer is required to carry out turn ratio or voltage ratio testing according to preventative test procedure of Power Ministry of the country. Operation of the traditional transformation ratio electric bridge is complicate, reading isn’t intuitional, and necesssary conversion shall be carried out, it is only carried out in single phase during testing, working efficiency is low. The XHBB128C Series transformation ratio meter series overcomes disadvantage of testing of the traditional transformation ratio electric bridge. The screen utilizes the large screen colourful liquid crystal display screen, operation is simple and intuitive, transformation raito testing of three phases can be complete one time, testing speed is quick, accuracy is high and protection function is perfect. The XHBB128C Series transformation ratio meter series can provide two poewer supply ways: external AC220V and internal battery, which faciliate the user to carry out testing.
Performance and characteristices
The interface applies the intelligent type touch way, operation is simple and convenient. The circuit applies the new generation of the complete digital scheme, which can ensure stability of the instrument for long term.
Testing speed is quick, transformation ratio testing of three phases can be compeleted only through one wiring, taking only 10 seconds.
Carry out testing of CT, PT, CVT and Z shape connected transformer.
Applicable to transformation ratio measurement of the power distribution tansformer to the 1000KV transformer, the current transformer （CT）, the voltage transformer （PT） and the Z shape connected transformer.
Several short circuit measurement ways are set up in internal area, which faciliate fault judgment.
Non-power off clock and date display, the instrument can save 50 groups of data, data during powering-off will not be lost.
Large screen colourful liquid crystal display, data are clear and readable, print by the thermal printer. The RS485 communication interface and U disk memory interface.
The instrument has high voltage and low voltage reverse connection protection function, which has short circuit, turn to turn short circuit protection functions of the transformer and mis-connected 380V protection function of the power supply.
Optional external AC220V and internal battery AC / DC power supply, it is not necessary to connect the external AC power supply and carry out testing
Number of displayed bit
160V(AC power supply)
10V (AC power supply）
Automatic (DC power supply)
Working power supply
Memory of testing data
≤80%, no dewing
Length 360mm × width 280mm × height 160mm
Single phase transformer：
Three phases transformer: