Measurement - ABB REL650 Technical Manual

Section 6
Impedance protection
6.1.7.10
116

Measurement

Measurement supervision
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 analogue output signals to the Disturbance Report
function
X equals Z in the name of the below mentioned settings.
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 setting
(XZeroDb where X equals Z).
Continuous monitoring of the measured quantity
Users can continuously monitor the measured quantity available in the function
block by means of four defined operating thresholds, see figure 49. 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 49.
1MRK 506 382-UEN A
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Line distance protection REL650 2.2 IEC
Technical manual
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