UNI-T UT593 - T Est of RCD Tripping Action Trigger Current

UT593/595 OPERATING MANUAL UT593/595 OPERATING MANUAL
XV. TEST OF RCD TRIPPING ACTION TRIGGER CURRENT (SEE FIG. 7)
Make the rotary switch point to Ramp test item in RCD. According to Fig. 7, insert special red,
green and black lines with power plugs into the red, green and black input ends on the side of the
instrument; connect plugs into power frequency civil 220V socket; press TEST key to start RCD
test.
Selection and operation of function keys F1-F4 is shown below:
F1 F2
F3
F4
AC/DC/time
I n
Not used
Backlight/0 /180
Instruments on key operation:
Press and hold F1 for about 2 seconds to open and close the backlight;
Press and release F1 for switching between 0 and 180 phase angles for RCD testing;
Press F2 for switching between RCD test type and count-down measuring mode; RCD test type:
optional full-wave and half-wave measuring modes; count-down measuring mode: in this mode,
press TEST key; in default, count-down from 30s to 0s to start RCD test.
Press F4 to start RCD rated leakage testing current selection function; rated set items and selection
sequence are as below:
Note: The set leakage current value varies with the waveform. The specific waveform is
corresponding with leakage current, as shown in the following table:
10mA
30mA
100 mA
300 mA
500Ma
Full wave
Half wave
Notice:
1. You must ensure normal supply of power frequency civil 220V in the power socket; in case of
abnormal power supply or no power, L-PE and L-N symbols at the lower-left corner of LCD blink
at the same time.
2. You must ensure that earth end of the power socket is soundly earthed; in case of poor
grounding or no grounding of the power socket, L-PE and N-PE symbols at the lower-left corner
of LCD blink at the same time.
3. You must ensure that neutral wire end of the power socket is reliably connected; in case poor
connection or no connection of the neutral wire end of the power socket, L-N and N-PE symbols
at the lower-left corner of LCD blink at the same time.
4. In measuring loop circuit impedance\fault expected short-circuit current, ensure that live wire
phase and neutral wire phase are not reversed for the power socket; otherwise, L-PE, L-N and
N-PE symbols at the lower-left corner of LCD blinks at the same time.
5. This kind of measurement is conducted under high-voltage state; much attention shall be given
to personal safety.