Phase angle reference
SEMOD54417-303 v5
All phase angles are presented in relation to a defined reference channel. The
General setting parameter PhaseAngleRef defines the reference, see section
"Analog inputs".
Zero point clamping
SEMOD54417-137 v4
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 general
setting (XZeroDb where X equals S, P, Q, PF, U, I, F, IL1-3, UL1-3, UL12-31, I1,
I2, 3I0, U1, U2 or 3U0). Observe that this measurement supervision zero point
clamping might be overridden by the zero point clamping used for the
measurement values within CVMMXN.
Continuous monitoring of the measured quantity
SEMOD54417-140 v5
Users can continuously monitor the measured quantity available in the function
block by means of four defined operating thresholds, see figure 282. The
monitoring has two different modes of operating:
• Overfunction, when the measured quantity exceeds the High limit (XHiLim) or
High-high limit (XHiHiLim) pre-set values
• Underfunction, when the measured quantity decreases under the Low limit
(XLowLim) or Low-low limit (XLowLowLim) pre-set values.
X_RANGE is illustrated in figure
282.
IEC05000657-3-en.vsdx
X_RANGE= 1
X_RANGE = 3
X_RANGE=0
Hysteresis
High-high limit
High limit
Low limit
Low-low limit
X_RANGE=2
X_RANGE=4
Y
t
X_RANGE=0
Y = Magnitude of the Measured Quantity
IEC05000657 V3 EN-US
Figure 282: Presentation of operating limits
Each analogue output has one corresponding supervision level output
(X_RANGE). The output signal is an integer in the interval 0-4 (0: Normal, 1:
High limit exceeded, 3: High-high limit exceeded, 2: below Low limit and 4: below
Low-low limit).
1MRK 506 382-UEN A Section 14
Monitoring
Line distance protection REL650 2.2 IEC 551
Technical manual
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