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FAQInjection SignalWhere can I find the value of injection signals for each IMD?
Metering & Power Quality
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This information is available in Vigilohm Catalogue, for each Insulation Monitoring Device.
Search for the "Measurement Voltage" and "Measurement Current" information.
For example:
> for IM400: the injection depends on which Application Mode is setup (Power system, Control command, photovoltaic)
>for XM300
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For XM300C/XML3xx, there are 2 modes, normal mode with low voltage/current and boost mode with high voltage/current. The IMD changes the mode when Ri cross the alarm threshold. Below is the injection value:
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For IM400, there are 3 normal mode and 1 boost mode with locating application and when default exist, see diagram below:
in boost mode the IM400 voltage generator is a little more higher(150Vp) and the signal is square 2.5Hz, Below is a shape of the Vf voltage on Rf when IM400 connected with it:
Vfpp=3V Vfp=1.5V
conditions:
IM400 fault threshold = 0.5Kohms, IM400 in locating mode
Rf=400 ohms => IM400 in boost mode with 150Vp scare signal generated
If calculation :
If= Vfp/Rf = 1.5/400 = 0.00375A
this current is closed to the maximum If current (Rf=0) generated by IM400
If max is calculated by 150/40000(Ri) = 0.00375A
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