Gossen Metrawatt PROFITEST PRCD M512R handleiding

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Gossen Metrawatt

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Handleiding

GMC-I Messtechnik GmbH 9

4.4 Varistor Test (PRCD-K)

During this measurement, the voltage is

ascertained at which the varistor becomes

conductive, thus checking the varistor for

correct functioning as well. Measurement

can be performed by means of an ISO ramp,

or with a fixed test voltage of 50 V.

As a prerequisite for this measurement, the

device under test must be switched on.

➭ Connect the PROFITEST MXTRA test instru-

ment to the PE IN and PE OUT sockets via

the 2-pole measuring adapter.

➭ Perform the measurement as described

in the operating instructions for the PROF-

ITEST MXTRA (section 11).

➭

The evaluation of the measured varistor re-

sistance depends on the manufacturer’s

specifications (PRCD-K from Kopp: e.g. 12

to 22 V according to Kopp).

Note on Kopp Test Specification:

PRCD-K (Varistor in Protective Earth Circuit)

Test Sequence by Kopp:

1.) Connect operating voltage (e. g. 230 V/

50 Hz) and 24 V AC voltage source.

2.) Select resistance (R) depending on the

residual current of the PRCD-K:

For PRCD-K

with In = 30 mA → R = 220 Ω/1 W.

For PRCD-K

with In = 10 mA → R = 620 Ω/0.5 W.

3.) Switch on PRCD-K by pressing the ON

button.

4.) Press key <T>

→ device must trip → PE

circuit is functioning properly.

The shutdown test of the PRCD-K stipulated

by KOPP at this point is performed in con-

nection with the testing of the RCD protec-

tion device with a continuously rising resid-

ual current until the device is tripped.

5 Protective Conductor Current

Measurement

➭ Connect the PRCD as described in sec-

tion 3.3.

➭ Switch mains power on by turning the

right-hand rotary selector switch to the

1~ ON or 3~ ON position depending on

the number of phases.

➭ Single-phase PRCD: Turn the left-hand ro-

tary selector switch to the first ON posi-

tion in the orange area for single-phase

interruption.

➭ 3-phase PRCD: Turn th e left-hand rotary se-

lector switch to the first ON position in the

green area for 3-phase interruption.

➭ Enclose the external protective conduc-

tor loop (5) with the jaws of the current

clamp transformer.

➭ Read the measured value for protective

conductor current at the current clamp

transformer.

Protective conductor current should not

exceed 3.5 mA.

Example of a Single-Phase PRCD

PROFITEST⏐PRCD Measurement with the PROFITEST MXTRA

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