Monitored Data; Operation Principle; Measurement Supervision - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
12.1.7.5

Monitored data

Table 191: VNMMXU Monitored data
Name
UL1
UL1ANGL
UL2
UL2ANGL
UL3
UL3ANGL
12.1.8

Operation principle

12.1.8.1

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
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
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
Technical Manual
Type Values (Range)
REAL -
REAL -
REAL -
REAL -
REAL -
REAL -
Figure 88. The monitoring has two different modes of
Figure 88.
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Unit Description
kV UL1 Amplitude, magnitude of reported
value
deg UL1 Angle, magnitude of reported value
kV UL2 Amplitude, magnitude of reported
value
deg UL2 Angle, magnitude of reported value
kV UL3 Amplitude, magnitude of reported
value
deg UL3 Angle, magnitude of reported value
Section 12
Monitoring
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