How to read Branch Residual Current measurements?
In parts of Europe, electrical installations must incorporate devices designed to protect people and prevent fires: the
residual current device, or RCD. A RCD disconnects the circuit if the total for the incoming and outgoing currents in the
monitored phases and their neutral conductor exceed a threshold, for example :
L1 + L2 + L3 + N > 30 mA
Data center practice: Residual Current Monitoring in relation to Residual Current Devices
Many devices inside a datacenter operate a switching power supply. These power supplies usually leak a bit of energy to
the protective earth, so even without failing hardware some residual current will occur. In order to rule out a single
dangerous fault from a sum of harmless smaller faults, one needs to set up a network of RC-sensors and monitor them
permanently. RC-monitoring can take place in many forms. The Schleifenbauer RC-sensor offers Class B metering, thus
enabling our customers to set-up an RC-monitoring system that prevents dangerous situations inside the datacenter.
Where to measure residual current?
When monitoring residual current at a single location it is not possible to determine whether the measured value is a sum
of many small currents or a single larger (dangerous) one. For that reason it contributes to the safety of the personnel
inside a data center when residual currents are metered at several points.
How to find the PDUs unit address, tag, name or location?
L1 + L2 + L3 + N > 0 mA …. THERE MIGHT BE FAULT IN YOUR SYSTEM !
When the PDU is equipped with a Residual Current Sensor (RCS), measurements of
the residual current are shown in the sensor pages.
(
See example images in the previous chapter “
).
The device name and tag can be
changed using the WEBAPI. See
the admin manual
Remote operating and
monitoring: Web interface
for
more details.
You will find all customer specific information about the PDU in the “Custom”
display.
●
Adr
= address of this unit on the databus
●
Tag
= vanity tag
●
Nme
= device name
●
Loc
= location of the device
Page 18 of 58
V262_User manual
Schleifenbauer PDU
