NAZJX transformer variable ratio of entire inspection device
Variable ratio checking device, transformer testing device, variable ratio testing device, variable ratio checking device
Overview of NAZJX
"NAZJX transformer ratio of the entire inspection device" (referred to as "variable") is used to test 0.1 and below transformer ratio tester than the accuracy and resolution of a device, and can test variable ratio group tester In the group test when the variable ratio accuracy and the accuracy of various groups of choice, and includes Z-shaped group.
First, the principle of structure
Instrument A, B, C, respectively, for three-phase input, junction ratio of the primary side of the tester, a, b, c for the three-phase output, connected to the secondary side of the tester. Function switch is a function selector switch, you can select the four functions of the measurement. The selector switch is used for group selection. This switch has a selection function for different groups of three-phase PTs, and a Z-shaped group can be selected. X, Y, Z, x, y, z, a ,, b ,, c ,, x ,, y ,, z, is used in verifying the accuracy of the standard transformation PT and the standard three- In addition, there is no other purpose, but not short of each other.
Second, use range of this tester
When used, A, B, C, a, b, c and variable ratio group tester connected to the corresponding terminal, A, B, C for the input voltage side button, a, b, c for the secondary output voltage side button. Function selector switch has four kinds of function selection, when it is placed in a function file, the "variable inspection" can only change the ratio of the group tester to test this function.
K1 and K2 are the group selection switches, and K2 and K3 are the Z group selection switches. The groups selected at this time are determined by the values in K1, K2 and K3 according to the "group switch selection table" given on the panel Do not state.
There are two resolution selection switches, that is, after the decimal point of two digits and three digits of choice. As a resolution test, the fractional part of the display should be the product of the standard value and the magnification, the two parts can be superimposed on each other, and the integer part always shows 25.
Third, performance indicators
1. Variable ratio test function
The presettable ratio values are:
220/6, 220/10, 220/6, 110/35, 110/10, 110/6, 35/10, 35/6,35/4, 10/10, 10/6, UAB / Uab value of the above-mentioned 20 kinds of options, this time, UAB rated voltage of 400V (1), UAB / , The device can work in the rated voltage of 20% to 120%, the secondary voltage Uab can bear 100KΩ or more load, which requires the test variable ratio tester secondary input impedance ≥ 100KΩ, then the standard variable ratio Of the error is less than 0.02%.
2. Resolution test function
When the function selector switch is set to "Resolution", it can test the resolution of the value displayed by the ratio tester, and the "check" can preset 25.001, 25.002, ... 25.099, 99 values for testing various variable ratio When the resolution of the tester is used, the error is not required in the resolution test, but when the test is changed to the resolution of the tester, the display value of the ratio tester should change obviously with the increase or decrease of the resolution.
3. Group test function
"PT" will be the standard three-phase PT by a star, the second star or triangle and a triangle, the second star or delta connection composed of 12 groups, variable ratio group tester can be all groups , And the test values of the standard three-phase PTs are 25 (10 / 0.4), 87.5 (35 / 0.4), 1050 respectively. The single-phase errors of the standard three-phase PTs are all less than 0.1%.
4.Z-shaped group test function
There are 10 groups (△ / Z or Y / Z) in the Z-shaped group. The other performance indexes are the same as the above "group test function".
5. Through test function
This function is to connect the primary voltage UAB of the ratio tester directly to the secondary end (a, b terminal), that is UAB = Uab, can carry on the 1/1 self-calibration of the variable ratio tester, pay attention not to Variable ratio test instrument used in the test.
