The calibration device for the ratio group tester is a standard calibration instrument designed specifically for the calibration of transformers and transformers. Referring to GB1094.1-1996 "Power Transformers Part 1 General Principles" and JJG314-2010 "Voltage Transformers for Measurement" calibration regulations, it is a standard equipment developed specifically for the calibration requirements of digital ratio group testers.

The instrument can complete the calibration and verification of the transformation ratio under a voltage of 200V, and is equipped with seven decimal adjustment disks to achieve arbitrary setting of the transformation ratio value. By combining three adjustment disks, D/d, D/y, D/z, Y/d, Y/y, Y/z, and connecting group settings can be achieved. The equipment adopts passive voltage proportional standard instruments, which are connected by three sets of single-phase proportional standards through switch combinations. The device is easy to operate, reliable in performance, and has strong anti-interference ability.

2、 Technical indicators:

1: General technical specifications of the whole machine

① Voltage ratio measurement accuracy level: 0.01 level

② Input voltage range: 0V~240V

③ Output voltage ratio range: 1.000000 to 100000

④ Output group ratio range: 10, 100, 1000

The output ratio at Y/Y and D/D is 101001000 as shown above,

But if it is another connection, there is a √ 3 relationship.

In the Y/D connection, the original transformation ratio should be/√ 3, which is 5.7735, 57.73557.35.

In the D/Y connection, the original transformation ratio should be * √ 3, which is 17.732173.21732

In the Y/z connection, the original transformation ratio should be/√ 3, which is 5.7735, 57.73557.35.

In the D/z connection, the original transformation ratio should be/3, which is 3.3333, 33.33333.33.

⑤ Output group ratio accuracy: 0.05%

⑥ Connection group setting range: D/y, D/d, D/z, Y/y, Y/d, Y/z