Manual Gossen Metrawatt Profitest Intro (page 27 of 62) (English)

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GMC-I Messtechnik GmbH 27

Special Case: Suppressing Display of the Limit Value

The limit value cannot be

ascertained. The inspec-

tor is prompted to evalu-

ate the measured val-

ues himself, and to

acknowledge or reject

them with the help of the

softkeys.

Measurement passed:

✔ key

Measurement failed: X

key

The measured value can

only be saved after it has

been evaluated.

8.3 Settings for Calculating Short-Circuit Current –

Parameter IK

Short-circuit current IK is used to test shutdown by means of an

overcurrent protective device. In order for an overcurrent protec-

tive device to be tripped on time, short-circuit current IK must be

greater than tripping current Ia (see table 6 in section 19.1). The

variants which can be selected with the “Limits” key have the fol-

lowing meanings:

IK: Ia The measured value displayed for IK is used without

any correction to calculate ZL-PE.

IK: Ia+Δ% The measured value displayed for ZL-PE is corrected

by an amount equal to the test instrument’s measuring

uncertainty in order to calculate IK.

IK: 2/3 Z In order to calculate IK, the measured value displayed

for ZL-PE is corrected by an amount corresponding to

all possible deviations (these are defined in detail by

VDE 0100-60 as Zs(m) ≤ 2/3 x U0/Ia).

IK: 3/4 Z Zs(m) ≤ 3/4 x U0/Ia

Short-circuit current calculated by the instrument (at nominal voltage)

Z Fault loop impedance

Ia Tripping current (see data sheet for circuit breakers / fuses)

Test instrument inherent error

Special case: Ik > Ikmax, see page 28.

See page 28 on accessing the fuse table via the

HELP

key.

9 Measuring Line Impedance (ZL-N function)

Measuring Method (internal line resistance measurement)

Line impedance ZL-N is measured by means of the same method

used for loop impedance ZL-PE (see section 8 on page 25). How-

ever, the current loop is completed via neutral conductor N rather

than protective conductor PE as is the case with loop impedance

measurement.

Select the Measuring Function

Schuko Connection

(country specific)

Connection: 2-pole

Set Parameters

Press the softkey shown at the left in order to switch

back and forth between the country-specific measur-

ing adapter, e.g. PRO-Schuko measuring adapter

(Z503K) / 3-pole measurement and the KS-PROFIT-

EST INTRO (Z503L) for 2-pole measurement. The selected con-

nection type is displayed inversely (white on black).

Limit Value:

IK < limit value

LIMIT

ZL-N

Nom. current:

2 ... 160 A, 9999 A

Diameter: 1.5 to 70 sq. mm

Cable types: NY..., H07...

Number of wires:

1 to 10-strand

Tripping characteristics:

A, B/L, C/G, D, E, H, K, GL/GG & factor

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Gossen Metrawatt Profitest Intro Manual

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