GE BUS1000, Инструкция по эксплуатации

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5. HARDWARE DESCRIPTION
5-6 BUS1000 Busbar Protection GEK-98514B
5.3.3. NON- REMOVABLE MODULES
They are used for assembling current transformers input transducers and other components.
They consist of a plate which supports their various components and several connecting blocks with the rest
of the modules and with the system.
In order to remove these modules it is necessary to reach the rear part of the rack unscrewing its rear cover
and removing the screws which hold the module as well as removing the connecting blocks. The module is
drawn out though the front part of the rack. This operation has to be done with the protection system
completely out of service and with its current inputs short-circuited.
5.3.4. LATCHING AND AUXILIARY RELAYS
They are unpluggable with their own connection bases located and wired in the racks.
They are provided with their own transparent cover and are removed through the front part of the rack.
They must not be removed without having previously checked that the protection system is out of service
and that their current inputs are short-circuited, given that their contacts may be part of the secondary circuit
of the current intermediate transformers, which means that their removal could mean the opening of these
circuits; this would cause the protection to trip or it would cause the operation of the alarm units, as well as
possible permanent damage to the intermediate transformers.
5.3.5. FRONT SIDE DEVICES
Line current measuring terminals (FIG. 7)
They are located in the front plates of the restraint modules (DFI) . They consist of 2 or 3 rows of terminals
according to the number of restraint inputs (2 maximum). The lower terminals correspond to the references
of each phase and the upper terminals to the inputs in each line, per phase.
The a.c. voltage measured in these terminals corresponds to the current flowing through the line on the 1 A
side.
Measuring terminals of the total restraint currents (FIG. 8)
They are located on the front plate of the differential module (DDI), in the upper row. The terminals in the
lower row correspond to the reference, which is also common for the measurement of the differential
currents.
The continuous voltage measured in these terminals corresponds to 90% of the arithmetical sum of the
currents of all the lines in the 1 A side.
Differential trip signalling (FIG. 9)
It is done by means of a red LED located in the front part of the boards in every differential single-phase unit.
It is a continuous signalling and the reset is carried out manually by means of a push-button located in the
front part of the same board.
Signalling of operation of the alarm unit (FIG. 10)
It is done by means of three red LEDs (one for every phase) located in the front part of the board, in the
alarm unit.
The signalling is continuous and the reset is achieved by means of a push-button placed in the front part of
the board itself.