GE ALPS, Инструкция по эксплуатации

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1-8 ALPS Advanced Line Protection System GE Power Management
1.2 INTRODUCTION 1 PRODUCT DESCRIPTION
1
c) RIGHT RESISTIVE BLINDER
The right resistive blinder is a two input phase angle comparator. The input signals for the comparator are:
Operate: I
φ′
· RB1 - V
φ
Polarize: I
φ′
· RB1
where:
The magnitude of RB1 (Right Blinder for Zone 1) is the point at which the characteristic intersects the R
axis. The range of adjustment will be 0.1 to 500.0 ohms in 0.1 ohm steps.
The angle of RB1 is be fixed based on the positive sequence line angle, the zero sequence line angle,
and the K0 factor. The angle is:
I
φ′
is the compensated phase current, ( I
A
- I
0
) + K
0
1
•
I
0
The characteristic timer angle will be fixed at 90°. For the Zone 1 ground function, the operate and polarizing signals are:
1.2.5 LINE PROTECTION SCHEMES
The ALPS provides four zones of distance protection with overcurrent backup functions. The ALPS is a highly flexible sys-
tem: along with predefined protection schemes, it also has the ability to be programmed by the user. The custom program-
mability of the ALPS is discussed in the next section.
The ALPS pilot protection schemes are as follows:
• Permissive Underreach Transfer Trip (PUTT)
• Permissive Overreach Transfer Trip (POTT1)
• Permissive Overreach Transfer Trip with blocking functions (POTT2)
• Blocking
• Hybrid
• Phase Identified Channel
In addition, each of the above schemes includes up to four zones of step distance backup with individual timers for phase
and ground zones.
Phase A: I
A
′
· RB1 – V
A
I
A
′
· RB1
Phase B: I
B
′
· RB1 – V
B
I
B
′
· RB1
Phase C: I
C
′
· RB1 – V
C
I
C
′
· RB1
where:
I
A
′
= ( I
A
- I
0
) + K
0
1· I
0
I
B
′
= ( I
B
- I
0
) + K
0
1· I
0
I
C
′
= ( I
C
- I
0
) + K
0
1· I
0
K
0
1 = | K
0
1| – (ZERSEQANG – POSSEQANG)
2 POSSEQANG
⋅
K
0 ZERSEQANG
⋅
+
2 K 0
+
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