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5.7. Oscillography
The SIL-D relay stores 5 oscillographic records, with a resolution of 16 samples/cycle and
a size of 100 cycles. The first three of these cycles correspond to pre-fault.
The oscillography is downloaded by communications through the front or rear port using
the Modbus protocol (the protocol is documented in this manual). The SICom
communications program allows the oscillograph to be downloaded and saved in
COMTRADE format (IEEE C37.111-1991).
The following information is included in each oscillographic record:
Number Analog channels
1 Phase A current
2 Phase C current
3 Neutral current
4 Neutral voltage
This current is already in primary amps.
As well as the analogue magnitudes, the relay saves 48 digital records, with the same
precision as 16 cycle samples. These 48 bits shall contain the following:
No. Digital channels No. Digital channels No. Digital channels
1 50_1 Trip 18
50_2 Phase B Pickup
35 Input 4
2 50_2 Trip 19
50_2 Phase C Pickup
36 Input 5
3 51 Trip 20
51 Phase A Pickup
37 Input 6
4 50N_1 Trip 21
51 Phase B Pickup
38 Output 1
5 50N_2 Trip 22
51 Phase C Pickup
39 Output 2
6 59N Trip 23
50N_1 Pickup
40 Output 3
7 67N_1 Trip 24
50N_2 Pickup
41 Output 4
8
67N_2 Trip
25
50BF Pickup
42 CLP activation
9
67NI_1 Trip
26 50BF Trip 43 74TCS Trip
10
67NI_2 Trip
27 59N Pickup 44 52 Open
11 External Trip 28 67N_1 Pickup 45 52 Close
12 General trip 29
67N_2 Pickup
46 79 Standby
13 Phase Block 30
67NI_1 Pickup
47 79 Lockout
14
50_1 Phase A Pickup
31
67NI_2 Pickup
48 79 Reclosing time
15
50_1 Phase B Pickup
32 Input 1
16
50_1 Phase C Pickup
33 Input 2
17
50_2 Phase A Pickup
34 Input 3