Справочник Пользователя для Benning IT 120 B 044102

33

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

to perform trip-out time measurement. 

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:
t:   

Trip-out time

Uc: 

Contact voltage

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.

An ever increasing fault current serves to test the limiting sensitivity for the FI/RCD tripping. The 
device increases the testing current in small steps over the whole range as follows:

AC

0.2

×I

∆N

1.1

×I

∆N

Sine AC

A (I

∆N

≥ 30 mA)

0.2

×I

∆N

1.5

×I

∆N

Pulsating

A (I

∆N

 = 10 mA)

0.2

×I

∆N

2.2

×I

∆N

B

0.2

×I

∆N

2.2

×I

∆N

Direct current DC

The maximum testing current is ID (tripping current) or equals the final value, if the FI/RCD has not
tripped.

How to perform trip-out current measurement:
Step 1 

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

/

 to se-

lect Trip-out current (RCD). The following menu is displayed:

 

 

Connect the test cable to the BENNING IT 110/ BENNING IT 120 B.