48
PrimeGear ZX0
P R O D U C T M A N U A L
—
4. Operation
General notes
•
All activities in connection with operation of the
switchgear require compliance with EN 50110
standard or relevant national regulations
regarding the operation of electrical
installations.
•
Always make sure that switching operations
have been completed before performing the
next switching operation.
Optional interlocking of the cable termination
compartment cover
The cover on the cable termination compartment
can only be removed when the outgoing feeder
of the relevant panel is earthed (earthing switch
and circuit breaker ON).
4.1 Panels with circuit breakers and three
position disconnectors
The three switching positions of the three position
disconnector, “connecting”, “disconnecting” and
“preparing for earthing” are clearly defined by the
mechanical structure of the switch. Connecting
and disconnecting the operating current and
earthing are performed exclusively by the circuit
breaker (Fig. 4.1.1 and Fig. 4.1.2). Fig. 4.1.3 to Fig.
4.1.8 show the switching sequence for earthing
of a busbar section using the Bus Tie and Bus
Riser, on the basis of an example switchgear
installation.
In order to avoid maloperation, the operating
mechanisms are mechanically or electrically
interlocked, and as an option also electrically
interlocked between different panels.
•
The three position disconnector (disconnector
and earthing switch function) can only be
operated when the circuit breaker is open. The
earthing switch can only be operated when the
disconnector is open. The disconnector can only
be operated when the earthing switch is open.
See the order documents for the
conditions of optional panel to panel
interlocks.
4.1.1 Notes on earthing of a feeder panel or
system section
When feeder panels or section of the
system has been earthed by operating
the earthing switch and circuit breaker
(Fig.4.1.1, and 4.1.3 to 4.1.8), secure it to
prevent cancellation of earthing as
follows.
Switch the mcbs
1)
for the circuit breaker
release circuit and for the
motor-operated mechanism of the three
position switch in the relevant panel off.
Lock the low voltage compartment door
or where appropriate the mechanical
OFF button for the circuit breaker.
Affix a sign to the panel to indicate that
earthing has been performed.