GE DFF1000 Series, Инструкция по эксплуатации

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GEK – 106166B
10
2.2 INTERNAL STATUS
The DFF is a microprocessor based relay that samples analog inputs, processes them by means of internal
algorithms and activates outputs accordingly. Most of the relay information may be accessed by the user in order
to create specific configurations for each application. With all this information the end-user can configure outputs,
inputs, LEDs and define alarms. All the programmable logic is based on AND, OR and NOT gates.
The DFF presents all this information as “Internal Status”. This is nothing but logical Boolean states of all the
internal variables available inside the relay. Each variable may be a “0” or a “1”. As an example, one internal state
is the pickup of a frequency unit. If this unit operates as underfrequency, its internal state will be “1”. This value
can be addressed to an output contact, an alarm or a LED.
By the same procedure if one digital input is activated, its “internal state” goes to “1”, and it can be addressed also
to an output contact, to an alarm or to a LED.
Programmable AND, OR and NOT logic can be done through the internal states information. For example,
activating one output when there is a pickup condition plus a digital input activation.
By adequate use of this “internal states” logic all kind of sophisticated load shedding schemes may be
implemented.
The DFF device has two different types of internal states:
•
Protection internal states.
•
General and communication internal states.
All those available communication internal states are shown in the following table:
TABLE I. COMMUNICATIONS INTERNAL STATES
Internal States Internal
States Internal States Internal
States
0 Mode: Remote (1)
Local (0) 20 40 60
1 Rear Connection 21 41 61
2 Front Connection 22 42 62
3 23 43 63
4 24 Protection
link 44 64 LED 1
5 25 Control
link 45 65 LED 2
6 26 46 66 LED 3
7 27 47 67 LED 4
8 28 48 68 LED 5
9 29 49 69 LED 6
10 30 50 70 LED 7
11 31 51 71 LED 8
12 32 New
events 52 72 LED 9
13 33 53 73 LED 10
14 34 54 74 LED 11
15 35 55 75 LED 12
16 Time/date alarm 36 56 76 LED 13
17 37 57 77 LED 14
18 Serial EEPROM
alarm 38 58 78 LED 15
19 System Settings 39 59 79 LED 16