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WARNING
Risk of injury due to electric voltage on
current transformers!
High voltage spikes that are dangerous to
touch can arise on current transformers that are
operated open on the secondary side, which
can result in serious injuries or even death.
Therefore, please observe the following:
·
Before starting work, disconnect your
system from the power supply! Verify that
there is no current.
·
Avoid open operation of the current
transformer.
·
Short circuit unloaded current
transformers.
·
Before interrupting the power supply, short
circuit the secondary connections of the
current transformer.
·
If a test switch is present that automatically
short circuits the secondary lines of the
current transformer, it is sufficient to
put it in the “test” position provided that
the short-circuiters have been checked
beforehand.
·
Only use current transformers that have
a basic insulation according to
IEC 61010-1:2010.
·
Fasten the attached screw-type terminal to
the device with the two screws.
·
Even safe open current transformers are
dangerous to touch if they are operated
open.
WARNING
Risk of injury or damage to the device due to
electric voltage and improper connection!
During high measured currents, temperatures
up to 80 °C can arise at the connections.
Use lines which are designed for an
operating temperature of at least 80 °C!
7.5.1 Current measurement connection
versions
Three-phase 4-conductor systems
Current measurement via
the current transformer in the three-phase
4-conductor systems
NOTE
·The device only permits setting one current
transformer ratio for all phases !
·You can easily configure the current
transformer ratios via
- the device menu.
- the GridVis
®
software.
·For information on programming the current
transformer, see chap. 12.5 on page 37.
·For information on exceeding the
measurement range, see chap. 17.4 on page
56.
Single phase 3-conductor system
Current measurement in the single-phase
3-conductor system
Three-phase 4-conductor systems
Current measurement via 2 current transformers in
the three-phase 4-conductor systems