Manual Gossen Metrawatt Profitest Intro (page 20 of 62) (English)

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20 GMC-I Messtechnik GmbH

7.2 Special Tests for Systems and RCDs

7.2.1 Testing Systems and RCCBs

with Rising Residual Current (AC)

for Type AC, A/F, B/B+ and EV, MI RCDs

Measuring Method

The instrument generates a continuously rising residual current of

(0.3 ... 1.3) • IΔN within the system for the testing of RCDs.

The instrument stores the touch voltage and tripping current val-

ues which were measured at the moment tripping of the RCCB

occurred, and displays them.

One of the touch voltage limit values, UL=25V or U

L=50/65V,

can be selected for measurement with rising residual current.

Select the Measuring Function

Connection

Setting Parameters for IF

Start Measurement

Measuring Sequence

After the measuring sequence has been started, the test current

generated by the instrument is continuously increased starting at

0.3 times nominal residual current, until the RCCB is tripped. This

can be observed by viewing gradual filling of the triangle at IΔ.

If touch voltage reaches the selected limit value (UL=65V, 50V

or 25 V) before the RCCB is tripped, safety shut-down occurs.

The LIMIT LED lights up red.

Note

Safety Shut-down: At up to 70 V, a safety shut-down is

tripped within 3 seconds in accordance with IEC 61010.

If the RCCB is not tripped before the rising current reaches nomi-

nal residual current IΔN, the LIMIT LED lights up red.

Attention!

If bias current is present within the system during mea-

surement, it’s superimposed onto the residual current

which is generated by the instrument and influences

measured values for touch voltage and tripping current.

See also section 7.1.

Evaluation

According to DIN VDE 0100-600, rising residual current must,

however, be used for measurements in the evaluation of RCDs,

and touch voltage at nominal residual current IΔN must be calcu-

lated from the measured values.

The faster, more simple measuring method should thus be taken

advantage of (see section 7.1).

7.2.2 Testing Systems and RCCBs with Rising Residual Current

(AC) for Type B/B+ and EV, MI RCDs

In accordance with VDE 0413-6, it must be substantiated that,

with smooth direct current, residual operating current is no more

than twice the value of rated residual current IΔN. A continuously

rising direct current, beginning with 0.2 times rated residual cur-

rent IΔN, must be applied to this end. If current rise is linear, rising

current may not exceed twice the value of IΔN within a period of 5

seconds.

Testing with smoothed direct current must be possible in both

test current directions.

Nom. res. current:

10 ... 500 mA

Type 1:

RCD, SRCD, PRCD etc.

Nominal current: 6 ... 125 A

Type 2: AC , A/F , B/B+ *,

EV/MI, EV/MI

* Type B/B+/EV/MI =

AC/DC sensitive

Waveform:

Positive direct current

negative half-wave

positive half-wave

Touch voltage:

Tripping limit values:

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Gossen Metrawatt Profitest Intro Manual

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