Measurements; Testing Rcds - METREL MI 3122 Instruction Manual

MI 3122 Smartec Z Line-Loop / RCD

5 Measurements

5.1 Testing RCDs

Various test and measurements are required for verification of RCD(s) in RCD protected
installations. Measurements are based on the EN 61557-6 standard.
The following measurements and tests (sub-functions) can be performed:
Contact voltage,

Trip-out time,

Trip-out current,

RCD autotest.

See chapter 4.1 Function selection for instructions on
key functionality.
Test parameters for RCD test and measurement
TEST RCD sub-function test [RCDt, RCD I, AUTO, Uc].
I Rated RCD residual current sensitivity I
N
500 mA, 1000 mA].
type RCD type [ ,
MUL
Multiplication factor for test current [½, 1, 2, 5 I
Ulim Conventional touch voltage limit [25 V, 50 V].
Notes:
Ulim can be selected in the Uc sub-function only.

The instrument is intended for testing of General (non-delayed) and
delayed) RCDs, which are suited for:
Alternating residual current (AC type, marked with

Pulsating residual current (A type, marked with

Time delayed RCDs have delayed response characteristics. As the contact voltage

pre-test or other RCD tests influence the time delayed RCD it takes a certain period
to recover into normal state. Therefore a time delay of 30 s is inserted before
performing trip-out test by default.
], test current waveform plus starting polarity [
24
Figure 5.1: RCD test
[10 mA, 30 mA, 100 mA, 300 mA,
N
].
N
symbol),
symbol).
Testing RCD
, , , ].
S elective (time-