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D E S I G N A N D F U N C T I O N O F T H E S W I T C H G E A R S Y S T E M A N D I T S E Q U I P M E N T
e.g. by tripping the mcb.
Cancelling the busbar earthing:
•
Open the control cabinet door for the outgoing
feeder and switch the mcb on, if necessary
releasing the OFF switch for the circuit breaker
•
Circuit breaker (-Q0) OFF
•
Disconnector OFF
Cancelling the tee-off earthing:
•
Earthing switch ON
•
Circuit breaker ON
•
Remove the short-circuiting bridge from the test
sockets and seal the sockets with blanking plugs
•
Circuit breaker OFF
•
Earthing switch OFF
3.11 Test facilities
The panels are properly filled with insulating
gas at the works and tested to the VDE or IEC
standards.
Should there be any need to perform tests, the
tests are to be performed as follows:
•
For voltage and current tests, direct access to
the conductors in the connection area is possible
without releasing the cable connection. Access
is effected via the test sockets (1.4)
Surge arresters must be removed during voltage
tests. The empty sockets must be closed with
insulating blanking plugs during testing!
Voltage transformers must be isolated from
the test circuit prior to testing.
—
Figure 3/1
Panel front view
with multifunction
protection and
switchbay control
unit, measuring
sockets for
capacitive voltage
indicator system at
front (optional),
with pressure relief
duct at top
(optional)
—
Figure 3/2
Panel type ZX1.5-R,
rear view.
Connection of two
cables per line
—
Figure 3/1
•
Voltage tests:
-
Close and insulate free cable sockets with
blanking plugs!
See section 6.4 for further details and the
applicable test voltages.
-
Perform cable tests with DC voltage or with
very low frequency (VLF) cosine or square
wave voltage
-
Cable fault locations measurement with
impulse voltage and
-
Switchgear tests (without cables) with AC
voltage can be performed with a test plug as
shown in figure 6/6 or a test cable
•
A test plug for current tests as shown in figure
(6/7) can be used to test the protection devices
by primary current injection (see also the note
in section 6.4.4). This configuration is short-
circuit proof and can also be used as an
additional maintenance earth
The possible testing processes are described in
the following sections:
•
Testing for the off-circuit
condition:
•
Testing for the in-line
condition:
•
High voltage tests:
•
Maintenance earthing:
—
Figure 3/2
15
Section 6.4.1
Section 6.4.2
Section 6.4.3
Section 6.4.4.
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