7.8.7.9 Measurement
Measurement supervision
SEMOD54417-130 v3
The protection, control, and monitoring IEDs have functionality to measure and further process
information for currents and voltages obtained from the pre-processing blocks. The number of
processed alternate measuring quantities depends on the type of IED and built-in options.
The information on measured quantities is available for the user at different locations:
• Locally by means of the local HMI
• Remotely using the monitoring tool within PCM600 or over the station bus
• Internally by connecting the analog output signals to the Disturbance Report function
GUID-8568A19F-0100-4A1A-B3C3-444FD7D6F00B v1
X equals Z in the name of the below mentioned settings.
Zero point clamping
GUID-4894EF16-3376-48EB-863F-9CE14487ACAB v1
Measured value below zero point clamping limit is forced to zero. This allows the noise in the input
signal to be ignored. The zero point clamping limit is a setting (
XZeroDb
where X equals Z).
Continuous monitoring of the measured quantity
SEMOD54417-140 v4
Users can continuously monitor the measured quantity available in the function block by means of
four defined operating thresholds, see figure
167. The monitoring has two different modes of
operating:
• Overfunction, when the measured current exceeds the High limit (
XHiLim
) or High-high limit
(
XHiHiLim
) pre-set values
• Underfunction, when the measured current decreases under the Low limit (
XLowLim
) or Low-
low limit (
XLowLowLim
) pre-set values.
X_RANGE is illustrated in figure 167.
1MRK 502 066-UUS B Section 7
Impedance protection
323
Technical manual
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