Section 8
1MAC050144-MB C
Measurement functions
534
615 series ANSI
Technical Manual
8.1.2
Measurement functionality
The functions can be enabled or disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
Some of the measurement functions operate on two alternative measurement modes:
"DFT" and "RMS". The measurement mode is selected with the
X Measurement mode
setting. Depending on the measuring function if the measurement mode cannot be
selected, the measuring mode is "DFT".
Table 441: Zero point clamping limits
Demand value calculation
The demand value is calculated separately for each phase. The demand function is
implemented by means of a function that calculates the linear average of the signal
measured over a settable demand time interval. A new demand value is obtained once in a
minute, indicating the analog signal demand over the demand time interval preceding the
update time. The actual rolling demand values are stored in the memory until the value is
updated at the end of the next time interval. The switching of the demand interval without
the loss of data is done by storing the one minute demand values in the memory until the
longest demand interval is available. The maximum demand values for each phase are
recorded with time stamps. The recorded values are reset with a command.
The demand value calculation is only available in the three-phase current measurement
function, IA, IB, IC.
Value reporting
The measurement functions are capable to report new values for network control center
(SCADA system) based on the following functions:
• Zero point clamping
• Deadband supervision
• Limit value supervision
Function
Zero clamping limit
Three-phase current measurement (CMMXU)
1% of nominal (In)
Three-phase voltage measurement (VMMXU)
1% of nominal (Un)
Residual current measurement (RESCMMXU)
1% of nominal (In)
Residual voltage measurement (RESVMMXU)
1% of nominal (Un)
Phase sequence current measurement (CSMSQI)
1% of the nominal (In)
Phase sequence voltage measurement (VSMSQI)
1% of the nominal (Un)
The single-phase power and energy measurement
(SPEMMXU)
1.5% of the nominal (Sn)
Three-phase power and energy measurement (PEMMXU)
1.5% of the nominal (Sn)
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