Load And Grounding Selection - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
IEC21000510 V1 EN-US
Figure 172: Interpolation of zero-crossings from adjacent samples, and half cycle time
ANSGPROC also calculates the amplitudes of the input signals. For current signals, the RMS value
is multiplied by √2. For voltage signals, the phase-to-ground amplitude is obtained by multiplying the
input RMS value by a factor taken from
Table 357: 3-phase amplitude evaluation
VT connection
3 phase star
1 phase star
3 phase delta
1 phase delta
The information is passed as group signals on the U3PPROC and I3PPROC outputs.
14.5.7.4

Load and Grounding Selection

In a controlled switching application, several functions require identical information on the type and
configuration of the switched load. This information centrally resides in ANSGPROG, configurable
through the LoadType and Grounding settings. From here, it is distributed to other functions through
the LODTYPOUT and LODGNDOUT outputs. The settings are described in
Technical Manual
Point-on-wave switching is not suggested to be used on rapidly changing system
conditions.
ZC ZC
1 2
Half cycle
time
evaluation
Zero-crossing, half-cycle and amplitude are always given as three phase output
irrespective of VT connection types. For single phase connection, the above
parameters are estimated for the unavailable phases assuming balanced power
system.
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Table 357, depending on the VT connection.
Voltage RMS multiplier
√2
√2
√⅔
√⅔
Section 14
Basic IED functions
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Table 358.
387