1MAC050144-MB C
Section 8
Measurement functions
615 series ANSI
535
Technical Manual
Zero point clamping
A measured value under zero point clamping limit is forced to zero. This allows the noise
in the input signal to be ignored. The active clamping function forces both the actual
measurement value and the angle value of the measured signal to zero. In the three-phase
or sequence measuring functions, each phase or sequence component has a separate zero
point clamping function. The zero value detection operates so that, once the measured
value exceeds or falls below the value of zero clamping limit, new values are reported.
Table 442: Zero point clamping limits
Limit value supervision
The limit value supervision function indicates whether the measured value of
X_INST
exceeds or falls below the set limits. The measured value has the corresponding range
information
X_RANGE
and has a value in the range of 0 to 4:
• 0: "normal"
• 1: "high"
• 2: "low"
• 3: "high-high"
• 4: "low-low"
The range information changes and the new values are reported.
In the three-phase voltage measurement function, VA, VB, VC, the
supervision functions are based on the phase-to-phase voltages. However,
the phase-to-ground voltage values are also reported together with the
phase-to-phase voltages.
Function
Zero clamping limit
Three-phase current measurement (IA, IB, IC)
1%of nominal (In)
Three-phase voltage measurement (VA, VB, VC)
1% of nominal (Vn)
Ground current measurement (IG)
1% of nominal (In)
Ground voltage measurement (VG)
1% of nominal (Vn)
Phase sequence current measurement (I1, I2, I0)
1% of the nominal (In)
Phase sequence voltage measurement (V1, V2, V0)
1% of the nominal (Vn)
Three-phase power and energy measurement (P, E)
1.5% of the nominal (Sn)
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