10.1.3 Functionality
Harmonic current values are available as measurements for each harmonic, THD and
TDD. There are also direct current component and fundamental frequency values.
The values of three phases are calculated separately.
There are short-time sliding measurement mean values (3 seconds, 1 minute or 5
minutes). In the configuration tool these values can be connected to other logics.
Blocks can be used as limiters, timers and multipurpose analog protection, and
alarms can be created when needed.
Non-sliding 10-minute measured mean values are available via communication to
substation monitoring products such as COM600S. Only the main function part
with an analog signal input must be connected in relay configuration. Data can
be collected and stored with the substation monitoring system to the historian
database.
These mean values can also be found in the LHMI menus of the protection relay and
WHMI.
The applicable power quality standards include EN 50160:2010, IEEE
519-2014, IEC 61000-4-7:2002+A1:2008 and IEC 61000-4-30:2015.
10.1.4 Analog channel configuration
CHMHAI has one analog group input which must be properly configured.
Table 1616: Analog inputs
Input Description
I3P Three-phase currents
See the preprocessing function blocks in this document for the possible
signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
10.1.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "on" and "off". Changes will result to reset the
function internal data.
The operation of CHMHAI can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
Power quality measurement functions
1MRS759142 F
1808 REX640
Technical Manual
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