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substation. At the configuration level, all the values received over the analog GOOSE are
compared through the MAX function to find the maximum value. The maximum value is
sent back to 51NHA as the
I_REF_RES
input. The operation of 51NHA is allowed in
case
I_REF_RES
is lower than the locally measured harmonics current. If
I_REF_RES
exceeds the locally measured harmonics current, the operation of 51NHA is blocked.
Analogue
GOOSE
receive
Analogue
GOOSE
receive
Analogue
GOOSE
receive
MAX
Analogue
GOOSE
send
51NHA
I_REF_RES
BLOCK
PI CKUP
TRIP
IG
I_HARM_RES
BLKD_I_REF
GUID-BC6D478E-223B-48C1-BF0B-918B10CDBDB8 V1 EN
Figure 195:
Protection scheme based on the analog GOOSE communication with
three analog GOOSE receivers
4.2.5.6
Signals
Table 389:
51NHA Input signals
Name
Type
Default
Description
IG
SIGNAL
0
Residual current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
I_REF_RES
FLOAT32
0.0
Reference current
Table 390:
51NHA Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip
PICKUP
BOOLEAN
Pickup
Section 4
1MAC059074-MB A
Protection functions
406
615 series ANSI
Technical Manual
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