Testboy TV 455 - Trip-Out Current (RCD I)

®
TV 450/455 Testing RCD
39
Figure 5.19: Example of trip-out time measurement results
Displayed results:
t ...........Trip-out time,
Uc........Contact voltage for rated I
ΔN
.
5.4.3 Trip-out current (RCD I)
A continuously rising residual current is intended for testing the threshold sensitivity for
RCD trip-out. The instrument increases the test current in small steps through
appropriate range as follows:
Slope range Waveform
RCD type
Start value End value
AC
0.2×I
ΔN
1.1×I
ΔN
Sine
A (I
ΔN
≥ 30 mA) 0.2×I
ΔN
1.5×I
ΔN
A (I
ΔN
= 10 mA) 0.2×I
ΔN
2.2×I
ΔN
Pulsed
B
0.2×I
ΔN
2.2×I
ΔN
DC
Maximum test current is I
Δ
(trip-out current) or end value in case the RCD didn’t trip-out.
Trip-out current measurement procedure
 Select the RCD function using the function selector switch.
 Set sub-function RCD I.
 Set test parameters (if necessary).
 Connect test cable to the instrument.
 Connect test leads to the item to be tested (see figure 5.17).
 Press the TEST key to perform the measurement.
 Store the result by pressing the MEM key.
Trip-out After the RCD is turned on again
Figure 5.20: Trip-out current measurement result example