ABB RET650 Technical Manual page 434

Section 14
Monitoring
428
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 analogue output signals to the Disturbance Report
function
Phase angle reference
All phase angles are presented in relation to a defined reference channel. The General
setting parameter PhaseAngleRef defines the reference. The PhaseAngleRef is set in
local HMI under: Configuration/Analog modules/Reference channel service
values.
Zero point clamping
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
Users can continuously monitor the measured quantity available in each function
block by means of four defined operating thresholds, see figure 191. 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 191.
1MRK 504 135-UEN A
Technical manual