Hitachi Relion 650 Series Technical Manual page 176

Section 12
Monitoring
High-high limit
High limit
Low limit
Low-low limit
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Figure 88:
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). The output may be connected to a measurement
expander block (MVEXP) to get measurement supervision as binary signals.
The logical value of the functional output signals changes according to
The user can set the hysteresis (XLimHyst), which determines the difference between the operating
and reset value at each operating point, in wide range for each measuring channel separately. The
hysteresis is common for all operating values within one channel.
Actual value of the measured quantity
The actual value of the measured quantity is available locally and remotely. The measurement is
continuous for each measured quantity separately, but the reporting of the value to the higher levels
depends on the selected reporting mode. The following basic reporting modes are available:
• Cyclic reporting (Cyclic)
• Amplitude dead-band supervision (Dead band)
• Integral dead-band supervision (Int deadband)
Cyclic reporting
The cyclic reporting of measured value is performed according to chosen setting (XRepTyp). The
measuring channel reports the value independent of amplitude or integral dead-band reporting.
In addition to the normal cyclic reporting the IED also report spontaneously when measured value
passes any of the defined threshold limits.
170
Y
X_RANGE=0
X_RANGE=2
X_RANGE=4
Presentation of operating limits
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X_RANGE = 3
X_RANGE= 1
Hysteresis
X_RANGE=0
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Figure 88.
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Technical Manual