7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-19
For this B-C test a minimum fault voltage of 23.6 V is required as calculated
in “B-C Fault Voltage Injections, for details see Table 7.15: B-C Fault Voltage
Injections on page 7-19. Select the next highest voltage. In this case 34.5 V
(70% reduction) is used.
Table 7.15: B-C Fault Voltage Injections
B-C Fault
(A phase voltage = 66.4 V
) The resultant angle of B-C voltage always = -90
% Reduction
10%
20%
30%
40%
50%
60%
70%
80%
90%
Fault V
103.5 V
92.0 V
80.5 V
69.0 V
57.5 V
46.0 V
34.5 V
23.0 V
11.5 V
Fault Volt Angle
-90
-90
-90
-90
-90
-90
-90
-90
-90
Voltage B=C
61.5 V
56.7 V
52.2 V
47.9 V
43.9 V
40.4 V
37.4 V
35.1 V
33.7 V
B Angle
-122.7
-125.8
-129.5
-133.9
-139.1
-145.3
-152.5
-160.9
-170.2
C Angle
122.7
125.8
129.5
133.9
139.1
145.3
152.5
160.9
170.2
Table 7.16: C-A Fault Voltage Injections
C-A Fault
(B phase voltage = 66.4 V
-120
) The resultant angle of C-A voltage always = +150
% Reduction
10%
20%
30%
40%
50%
60%
70%
80%
90%
Fault V
103.5 V
92.0 V
80.5 V
69.0 V
57.5 V
46.0 V
34.5 V
23.0 V
11.5 V
Fault Volt Angle
150
150
150
150
150
150
150
150
150
Voltage C=A
61.5 V
56.7 V
52.2 V
47.9 V
43.9 V
40.4 V
37.4 V
35.1 V
33.7 V
C Angle
117.3
114.2
110.5
106.1
100.9
94.7
87.5
79.1
69.8
A Angle
2.7
5.8
9.5
13.9
19.1
25.3
32.5
40.9
50.2
Summary of Contents for L-PRO 4000
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