BENNING IT 115
Device description
- 36 -
5.4 RCD testing
The testing of RCDs in RCD-protected installations requires various tests and measurements.
The measurements are based on the EN 61557-6 standard.
The following measurements and tests can be performed:
Contact voltage, tripping time, tripping current and
Automatic RCD testing
Key function as described in chapter
4.2 Function selector switch
Figure 5
.16
:
RCD tests
Testing parameters
Test
Sub-function
[
Uc
,
RCDt
,
RCD I
,
AUTO
]
I
N
Nominal tripping differential current I
N
[10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 1000 mA]
RCD
type
Type
[AC, A, F]
Initial polarity
[
,
,
,
]
Properties
[selective
, standard undelayed
, PRCD, PRCD-S, PRCD-K]
MUL
Multiplier of testing current
[½x, 1x, 2 x, 5xI
N
]
Ulim
Limiting value of contact voltage
[25 V, 50 V]
Note:
The limiting value of the contact voltage can be set only in the Uc sub-function.
Selective (delayed) RCDs have delayed tripping times. As the contact voltage
measurement and other RCD tests influence delayed RCDs, it takes a certain time until
they have returned to their normal condition. For this reason, a time delay of 30 seconds
is added before the standard tripping test is performed.
During testing of some portable PRCDs (e.g. PRCD-K) in which the protective conductor
is guided through the converter in opposite direction, this portable RCD trips already at
the 0.5-fold value of the nominal tripping differential current. The installation tester
evaluates the early tripping as "accidental tripping" and aborts the test without any
measuring result. If this test has been carried out with a positive result, i.e. it has been
proven that the portable PRCD trips at the 0.5-fold value of the nominal tripping
differential current and thus the protective conductor is not interrupted, it is possible to
continue the test by changing the contacting of the protective conductor. In this case, it
is necessary to establish a contact to the protective conductor (PE) of an adjacent
socket instead of establishing a contact to the protective conductor (PE) of the coupling
socket for further testing. Then, the test can be performed just as for an ordinary RCD.
