ABB UniSec DY800, Инструкции по установке, обслуживанию и техническому обслуживанию

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9 D I S T R I B U T I O N S O LU T I O N S
Key
1 Mechanical opening
pushbutton
2 Mechanical closing
pushbutton
3 Circuit-breaker spring
loading lever
4 Voltage detectors
5 Circuit-breaker state
6 Circuit-breaker
operation counter
7 SL position state
8 ST operating seat
9 ST position state
10 ST operating seat
11 Circuit-breaker -
Disconnector interlock
12 Electrical pushbuttons
of circuit-breaker
5.3.3 Main components
All three UniSec DY800 cubicles use the same,
previously described, multi-function apparatus
comprising the following functional components:
• 3-position disconnector (line, isolated, earth)
This is an SF
6
-insulated disconnector; in the open
position, the moving contacts guarantee that the
isolated position is maintained.
In the line closed position, the moving contacts fit
into the fixed upper contacts installed in the lower
part of the vacuum interrupter of the circuit-breaker.
In the closed earthed position, the moving contacts
fit into the fixed lower contacts in the metal
structure.
Key
1 Vacuum interrupter
2 Fixed contact of
feeder disconnector
SL
3 Moving contact of
disconnector
4 Fixed contact of
earthing switch ST
5.3.5 Characteristics of the circuit-breaker
operating mechanism
The circuit-breaker is equipped with a three-pole
operating mechanism with the following circuits
and devices:
• a three-pole voltage start-up closing circuit;
• a three-pole voltage start-up opening circuit;
• an anti-pumping device to prevent further
closings other than the first when opening occurs
during the initial closing request. This device must
not be deactivated by functional inhibitions.
Operating energy storage occurs in two ways:
1) by means of a DC-powered electric motor with the
following characteristics:
– Rated auxiliary power supply voltage: 24 VDC
– Maximum consumption (excluding inrush) 300 W
– Spring reloading time max 30 s
2) by means of a mechanical device operated in the
manual mode by the operator.
The multi-function apparatus has a mechanical lock
that prevents the three-position disconnector from
moving when the circuit-breaker is closed.
With the circuit-breaker closed and the electric
circuit of the operating power restoration motor
disconnected, the energy stored by the system
described above must be able to allow the circuit-
breaker to accomplish the operating sequence:
O - 0.3 sec - CO.
5.3.4 Characteristics of the 3-position
disconnector operating mechanism
The disconnector is equipped with a three-position
stored energy operating mechanism operated by a
dedicated lever.