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GHIELMETTI AG,
Industriestrasse 6, CH-4562 Biberist, Schweiz - www.ghielmetti.ch - [email protected] -
+41 32 671 13 13 -
+41 32 671 13 14
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Functional description
The tripping matrix
GKV 10x45 621 SK R LDP
is a component of a generator
protection system. The tripping matrix provides a transparent, easily programmable
facility for combining output commands of the trip outputs of individual protection
devices with plant items such as the circuit-breakers, de-excitation etc. The matrix was
developed for marshalling tripping commands of large power stations. With its help, the
tripping schematic can be temporarily changed, e.g. in case of a generator circuit-
breaker revision. If the software matrix incorporated in each generator protection unit is
used for marshalling the tripping commands, the marshalling in the protection units
must be changed for this purpose.
The tripping matrix assigns the tripping signals arriving at the matrix columns (from the
solid-state protection relays) to the freely programmable matrix lines to which the
tripping modules are connected.
Mode of Operation
The tripping matrix
GKV 10x45 621 SK R LDP
has 45 columns (for 45 signals from
protection units) and 10 rows (for 10 signals to tripping modules)
High reliability diode plugs (black handle) are used for programming the matrix, the
reliability being attained by generous over-rating with respect to forward current and
reverse voltage.
The diode plugs are inserted from the front and enable any vertical column (signals from
the protection relays) to be connected to any horizontal line so that the tripping signals
can be transmitted to the tripping module.
Each column has a LED for indicating tripping commands. The display is stored.
Each additional outgoing tripping command received additionally sets a group memory,
which, for example, can be used for remote signalling and switching a cubicle lamp.
All signals remain stored even when the tripping channels are interrupted or when the
red central connecting plug is removed.
The memories can be reset directly by a push-button "Reset" or by remote reset.
The function of all LED’s may be checked by pressing the "LED-Test" button.
The power supply of the relays and memory functions is 250VDC and feed an additional
5 VDC voltage for the LED function. The monitoring of the power supply is done by two
relay contacts.
Optional: A lockable acryl-glass-cover inhibits unauthorised access to the programming
matrix.
Unused diode and connecting plugs are stored in a pin park.
