Manual Gossen Metrawatt Profitest Intro (page 19 of 62) (English)

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GMC-I Messtechnik GmbH 19

1) Measuring Touch Current Without Tripping the RCD

Measuring Method

The instrument uses a measuring current of only ⅓ nominal resid-

ual current for the determination of touch voltage UIΔN which

occurs at nominal residual current. This prevents tripping of the

RCCB.

This measuring method is especially advantageous, because

touch voltage can be measured quickly and easily at any electrical

outlet without tripping the RCCB.

The usual, complex measuring method involving testing for the

proper functioning of the RCD at a given point, and subsequent

substantiation that all other systems components requiring pro-

tection are reliably connected at low resistance values to the

selected measuring point via the PE conductor, is made unneces-

sary.

N-PE Reversal Test

Additional testing is conducted in order to

determine whether or not N and PE are

reversed. The pop-up window shown at

the right appears in the event of reversal.

Attention!

In order to prevent the loss of data in data processing

systems, perform a data backup before starting the

measurement and switch off all consumers.

Start Measurement

Amongst other values, touch voltage UIΔN and calculated earthing

resistance RE appear at the display panel.

Note

The measured earthing resistance value RE is acquired

with very little current. More accurate results can be

obtained with the selector switch in the RE position.

The DC + function can be selected here for sys-

tems with RCCBs.

Unintentional Tripping of the RCD due to Bias Current within the

System

If bias currents should occur, they can be measured with the help

of a clamp type current transformer. The RCCB may be tripped

during the testing of touch voltage if extremely large bias currents

are present within the system, or if a test current was selected

which is too great for the RCCB.

After touch voltage has been measured, testing can be performed

to determine whether or not the RCCB is tripped within the

selected time limit values at nominal residual current.

Unintentional Tripping of the RCD due to Leakage Current in the

Measuring Circuit

Measurement of touch voltage with 30% nominal residual current

does not normally trip an RCCB. However, the trip limit may be

exceeded as a result of leakage current in the measuring circuit,

e.g. due to interconnected consumers with EMC circuit, e.g. fre-

quency converters or PCs.

2) Tripping Test after the Measurement of Touch Voltage

➭

Press the I

key

The tripping test need

only be performed at

one measuring point for

each RCCB.

If the RCCB is not tripped at nominal residual current, the MAINS/NETZ

LED blinks red (line voltage disconnected) and, amongst other val-

ues, time to trip ta and earthing resistance RE appear at the dis-

play panel.

If the RCCB is not tripped at nominal residual current, the LIMIT LED

lights up red.

Touch Voltage Too High

If touch voltage UIΔN, which has been measured with ⅓ nominal

residual current IΔN and extrapolated to IΔN, is > 50 V (> 25 V), the

LIMIT LED lights up red.

If touch voltage UIΔN exceeds 50 V (25 V) during the measuring

sequence, safety shut-down occurs.

Note

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

tripped within 3 seconds in accordance with IEC 61010.

Touch voltages of up to 70 V are displayed. If the value is greater

than 70 V, UIΔN > 70 V is displayed.

Limit Values for Allowable, Continuous Touch Voltage

The limit for allowable, continuous touch voltage is equal to

UL= 50 V for alternating voltages (international agreement).

Lower values have been established for special applications

(e.g. medical applications: UL=25V).

Attention!

If touch voltage is too high, or if the RCCB is not tripped,

the system must be repaired (e.g. earthing resistance is

too high, defective RCCB etc.)!

3-Phase Connections

For proper RCD testing at three-phase connections, the tripping

test must be conducted for one of the three phase conductors

(L1, L2 or L3).

Inductive Power Consumers

Voltage peaks may occur within the measuring circuit if inductive

consumers are shut down during an RCCB trip test. If this is the

case, the test instrument might not display any measured value

(– – –). If this message appears, switch all consumers off before

performing the trip test. In extreme cases, one of the fuses in the

test instrument may blow, and/or the test instrument may be

damaged.

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Gossen Metrawatt Profitest Intro Manual

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