experiment method:

AC voltage/current/inverse time current relay calibration

In the "gradual test" software module, set Ua (or Uab)/Ia as the "fundamental wave" output, and set it to a certain initial value, set the step length, and click the "output increase" and "output decrease" with the mouse ”Button or press the F5 and F6 shortcut keys on the keyboard to add or subtract voltage/current, measure the action value and return value of the voltage/current/inverse time current relay, and calculate the return coefficient.

DC voltage/current relay calibration

In the "gradual change test" software module, set Ua (or Uab)/Ia to "DC" output, and set it to a certain initial value, set the step size, and click "output increase" and "output decrease" with the mouse Button or press the F5, F6 shortcut keys on the keyboard to add or subtract voltage/current, measure the action value and return value and action time and return time of the voltage/current relay, and calculate the return coefficient.

3. Time relay calibration

In the "gradual change test" software module, the action value, return value, action time, and return time are measured according to the test method of DC or AC voltage relay.

Power relay calibration

(1) Measurement of action area and sensitive angle of power direction relay

In the "gradual test" software module, set Uab and Ia as rated values, set the Uab phase angle step length, add and subtract voltage phase angles, and measure the boundary angles φ1 and φ2 on both sides of the action zone, then the sensitivity angle φLM=1/ 2 (φ1+φ2).

(2) Measurement of z small operating power

In the "gradual test" software module, set the angle at the sensitive angle φLM, set Ia (or Uab) as the rated value, Uab (or Ia) as zero, set the step length of Uab (or Ia), and increase the voltage ( Or current). Measure z small action power.