Справочник Пользователя для Benning IT 120 B 044102

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Step 2 

By using cursor keys the following parameters can be set in this measurement:

 

 

- 

  Nominal residual current

 

 

- 

 RCD type

 

 

- 

 Test current starting polarity

 Follow the connection diagram shown in figure 5.15 (see the chapter Contact voltage) 

to perform trip-out current measurement. Use the Help function if necessary. 

Step 4 

Check the displayed warnings and online voltage/terminal monitor before starting the 
measurement. If OK, press the TEST key. After performing, the measurement results 
with PASS/FAIL indication appear on the display. 

Displayed results:
I

 

Trip-out current

 

Contact voltage

tI:   

Trip-out time

Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on 
setting functions and saving of measurement results (BENNING IT 120 B only).

Note:
-   Parameters set in this function are also kept for other RCD functions.
-   RCD trip-out time measurement will be performed only if contact voltage at nominal differential 

current is lower than the set limit contact voltage.

-   The measurement of contact voltage in pre-test does not normally trip an RCD. However, the 

trip limit may be exceeded as a result of leakage current flowing to the PE protective conductor
or via a capacitive connection between L and PE conductors.

The purpose of the autotest function is to perform complete RCD testing and measurement of 
the relevant parameters (contact voltage, loop impedance (fault loop resistance) and trip-out 
time at different fault currents) in one set of automatic tests, controlled by the BENNING IT 110/ 
BENNING IT 120 B. If any false parameter is noticed during autotest, the individual parameter test 
has to be used for further investigation.

How to perform RCD autotest:
Step 1 

Select FI/ RCD TEST (RCD) with the function selector switch. Use the 

/

 keys to se-

lect RCD autotest function. The following menu is displayed: