In the "Ramp Test" software module, set Ua (or Uab)/Ia to "Fundamental" output, and set it to an initial value, set the step size, use the mouse to click the "Output Increase", "Output Decrease" buttons or press the F5, F6 shortcut keys on the keyboard to increase/decrease voltage/current, measure the operate value and return value, and operate time and return time of voltage/current/inverse-time current
relay, and calculate the return coefficient.
DC Voltage/Current Relay Calibration
In the "Ramp Test" software module, set Ua (or Uab)/Ia to "DC" output, and set it to an initial value, set the step size, use the mouse to click the "Output Increase", "Output Decrease" buttons or press the F5, F6 shortcut keys on the keyboard to increase/decrease voltage/current, measure the operate value and return value, and operate time and return time of voltage/current relay, and calculate the return coefficient.
3．Time Relay Calibration
In the "Ramp Test" software module
, measure the operate value, return value, operate time, and return time according to the test method for DC or AC voltage
relay.
Power Relay Calibration
(1) Measurement of operating zone and sensitive angle of power direction
relay
In the "Ramp Test" software module, set Uab and Ia to rated values, set the step size of Uab phase angle, increase/decrease the voltage phase angle, measure the boundary angles φ1 and φ2 on both sides of the operating zone, then the sensitive angle φLM=1/2(φ1+φ2).
(2) Measurement of minimum operating power
In the "Ramp Test" software module, set the angle to the sensitive angle φLM, set Ia (or Uab) to the rated value, Uab (or Ia) to zero, set the step size of Uab (or Ia), increase the voltage (or current). Measure the minimum operating power.
(3) Creep test
In the "Ramp Test" software module, open the current circuit, set the initial value of Uab to zero and the step size to the rated voltage, suddenly apply or remove the voltage, and the relay contacts should not have a transient closing phenomenon.
Short-circuit the voltage circuit through a resistor, set the initial value of Ia to zero and the step size to several times the rated current, suddenly apply or remove the current, and the
relay contacts should not have a transient closing phenomenon.
(4) Memory function test
In the "Ramp Test" software module, set the angle to the sensitive angle, set Ia to 0.5 times and several times the rated current, suddenly drop Uab from 100V to zero, the relay should operate reliably, indicating good memory function.
Impedance Relay Calibration
(1)Measurement of sensitive angle and setting impedance of impedance relay
In the "Ramp Test" software module, set Ia to 5A (or 1A), Uab to the voltage corresponding to 0.7 times the setting impedance, increase/decrease the voltage phase angle, measure the boundary angles φ1 and φ2 on both sides of the operating zone, then the sensitive angle φLM=½(φ1+φ2). Set the phase angle to φLM, change the voltage from high to low until the relay operates, obtain the operating voltage UDZ, and calculate the setting impedance ZSET according to ZSET=UDZ/I.
(2) Measurement of precision current curve
In the "Ramp Test" software module, fix the angle between voltage and current at φLM, change the current Iab step by step, at each current increase/decrease the voltage Uab (can be done automatically), measure the operating value, and plot the precision current curve Z=f(I).
(3) "Bird peck" phenomenon
