Bender EDS3090 - Indication of the Harmonics During Residual Current Measurement

Operation
50
EDS309x_D00012_03_M_XXEN/11.2014
Possible error messages
 Self test error:
– Incorrect current transformer type set
– EDS195P hardware faulty
– Clamp moved while the indication ">>>Self test<<<" was displayed
– An interfering residual current is flowing through the clamp
– There is a PGH locating pulse acting on the clamp
 No CT connected:
Measuring clamp or measuring current transformer not connected or faulty.
 Error IΔL (can only be indicated while a measurement is in progress):
– Low frequency interference, measurement not possible
– EDS195P hardware faulty
 IΔn >10 A / > 1 A:
There is a residual current > 10 A or >1A flowing through the measuring clamp. In this case it is
not possible to locate the insulation fault on the related outgoing circuit. Residual currents of
this magnitude in an IT system can be caused by large system leakage capacitances or multiple
insulation faults. It is therefore possible that there is an insulation fault on this outgoing circuit
also with this alarm message
6.12.5 Indication of the harmonics during residual current measurement
Using the EDS195P it is also possible to measure harmonics of the fundamental frequencies of 50 or
60 Hz.
1. Switch on the EDS195P by pressing the button.
The device is in the EDS mode. IΔL appears in the first line of the display
2. Check correct setting for the selection of the clamp or current transformer on the display, cor-
rect if necessary
3. Now select the measurement type I
Δn (RCM mode) using the button
4. Then make the following settings:
– Check response value on menu 2.3 (Settings I
Δ
n
) and change if necessary
– Check system frequency on menu 2.6 (Settings I
Δ
n
) and change if necessary
– Activate measurement of the harmonics on menu 2.7 (Settings /Harmonics)
– Select the required harmonics on menu 4.
The EDS195P indicates the harmonics of a residual current at each measuring point. If the residual
current is greater than the response value set, the "ALARM" LED flashes and the measured value is
displayed. If the buzzer is activated, there is also an audible signal.
After the activation of the harmonics in menu 2.7, the harmonic with the greatest amplitude and the
total harmonic distortion in % can be seen in the standard display with the menu closed.
I
I
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