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Operation characteristic
After the admittance calculation is released, the calculated neutral admittance is compared
to the admittance characteristic boundaries in the admittance plane. If the calculated
neutral admittance Yo moves outside the characteristic, the enabling signal is sent to the
timer.
21YN supports a wide range of different characteristics to achieve the maximum
flexibility and sensitivity in different applications. The basic characteristic shape is
selected with the
Operation mode
and
Directional mode
settings.
Operation mode
defines
which operation criterion or criteria are enabled and
Directional mode
defines if the
forward, reverse or non-directional boundary lines for that particular operation mode are
activated.
Table 378:
Operation criteria
Operation mode
Description
Yo
Admittance criterion
Bo
Susceptance criterion
Go
Conductance criterion
Yo, Go
Admittance criterion combined with the conductance
criterion
Yo, Bo
Admittance criterion combined with the susceptance
criterion
Go, Bo
Conductance criterion combined with the
susceptance criterion
Yo, Go, Bo
Admittance criterion combined with the conductance
and susceptance criterion
The options for the
Directional mode
setting are "Non-directional", "Forward" and
"Reverse".
illustrate the admittance characteristics supported
by 21YN and the settings relevant to that particular characteristic. The most typical
characteristics are highlighted and explained in details in the chapter
. Operation is achieved when the calculated neutral admittance Yo moves
outside the characteristic (the operation area is marked with gray).
The settings defining the admittance characteristics are given in primary
milliSiemens (mS). The conversion equation for the admittance from
secondary to primary is:
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
381
Technical Manual
Содержание Relion 615 series
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