2 Functions
276
7UT613/63x Manual
C53000-G1176-C160-2
2.18 External Trip Commands
2.18.1 Function Description
Direct Trip Com-
mands
Two desired trip signals from external protection or supervision units can be incorpo-
rated into the processing of the differential protection 7UT613/63x. The signals are
couples into the device via binary inputs. Like the internal protection and supervision
signals, they can be annunciated, delayed, transmitted to the output trip relays, or
blocked individually. This allows to include mechanical protective devices (e.g. pres-
sure switch, Buchholz protection) in the processing of the protection relay.
The minimum trip command duration set for all protective functions are also valid for
these external trip commands (TMin TRIP CMD, address 851).
The logic diagram illustrates these „direct couplings“. Two of these functions are avail-
able. The message numbers are illustrated for external trip command 1.
Figure 2-112 Logic Diagram of External Trip Feature — illustrated for external trip 1 (simpli-
fied)
Transformer Mes-
sages
In addition to the external trip commands as described above, some typical messages
from power transformers can be incorporated into the processing of the 7UT613/63x
via binary inputs. This prevents the user from creating user-specified annunciations.
These messages are known as the Buchholz alarm, Buchholz trip and Buchholz tank
alarm as well as gassing alarm of the oil (see table 2-10).
Table 2-10 Transformer messages
No. Information Type of In-
formation
Description
390 „>Gas in oil“ SI >Warning stage from gas in oil detector
391 „>Buchh. Warn“ SI >Warning stage from Buchholz protection
392 „>Buchh. Trip“ SI >Tripp. stage from Buchholz protection
393 „>Buchh. Tank“ SI >Tank supervision from Buchh. protect.
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