Hitachi RED670 Commissioning Manual page 154

Section 11
Testing functionality by secondary injection
• State 1: pre-test condition.
Steady voltage and current are applied in order to get a steady high impedance, that is, a point
in the plane R-X which is far away from the lens characteristic. Define the following three-phase
symmetrical quantities (the phase angle is related to phase L1):
V
ts
EQUATION14069 V1 EN-US
Ð
V
EQUATION14068 V1 EN-US
frequency of V
I
50s
I
tfs
• State 2: main test step.
Define the following three-phase symmetrical quantities (the phase angle is related to phase
L1):
V
ts
EQUATION14069 V1 EN-US
Ð
V
EQUATION14068 V1 EN-US
frequency of V
I
50 s
EQUATION14059 V1 EN-US
∠I
50s
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
Expected result: the protection function does not issue either start or trip.
After each test it is possible to download and study the related disturbance recording.
148
V
VT s ,
1 1 . V 1 1 5899 .
= × × = ×
t RvsZ ,
V
VT p ,
æ ö
ReverseX
= ç ÷ -
arctan
è ø
ts
ReverseR
= 50 Hz
ts
= 0 A
= 0 A
V
VT s ,
1 1 . V 1 1 5899 .
= × × = ×
t RvsZ ,
V
VT p ,
æ ö
ReverseX
= ç ÷ -
arctan
è ø
ts
ReverseR
= 50 Hz
ts
I 1
CTs
I 10459
= × = ×
50
9000
I
CTp
= 0º
= 50 Hz
50s
I 1
CTs 10459
I
= × = ×
tf
I 9000
CTp
= 180º
= 50.5 Hz
tfs
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0 1 .
47 02 . V
× =
13 8 .
æ ö
29.60
° = ç ÷ -
180 arctan 180
è ø
0.29
0 1 .
47 02 . V
× =
13 8 .
æ ö
29.60
° = ç ÷ -
180 arctan 180
è ø
0.29
= . 1 162 A
1 162 .
A
=
1MRK 505 378-UEN Rev. K
° = - °
90.56
° = - °
90.56
GUID-7C9F1163-0186-41DA-9D5F-DDA589323B9F v1
Line differential protection RED670
Commissioning manual
(Equation 74)
(Equation 75)
(Equation 76)
(Equation 77)
(Equation 78)
(Equation 79)