1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
179
Technical Manual
magnitude, the
FAULT_DIR
and
DIRECTION
outputs are set to 0 = unknown, except
when the
Allow non dir
setting is "True". In that case, the function is allowed to operate in
the directional mode as non-directional, since the directional information is invalid.
The calculated I
0
sin(
φ
) or I
0
cos(
φ
) current used in direction determination can be read
through the
I_OPER
monitored data. The value can be passed directly to a decisive
element, which provides the final pickup and trip signals.
The following examples show the characteristics of the different operation criteria:
Example 1.
I
0
sin(
φ
) criterion selected, forward-type fault
=> FAULT_DIR = 1
Figure 80:
Operating characteristic I
0
sin(φ) in forward fault
The operating sector is limited by Angle correction, that is, the operating sector is 180
degrees - 2*(Angle correction).
The
I_OPER
monitored data gives an absolute value of the calculated
current. Otherwise, the value of a current in a reverse area is negative.
RCA
= -90 deg
Correction
angle
Min operating
current
0
0
0
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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