ABB UniGear ZS3.2, Instruction Manual

Page: 34 / 48

34 UniGear ZS3.2 I N S T R U C T I O N M A N U A L
A distinction must be made between the low
impedance system and the high impedance
system. For further details, see draft standard
IEC 61243 Part 5.
The two systems differ in several respects,
including different voltage levels which constitute
the display thresholds. The capacitive voltage
dividers installed in the panels are correspondingly
of different ratings, and the measuring point
sockets and indicator units are of different
types.
Note:
The only permissible indicators are those
which satisfy the requirements of the IEC
standards and correspond to the technical
design of the indication system in the
relevant switchgear!
Note:
The measuring point sockets must on no account
be short-circuited, except for voltage tests on
the installation (e.g. at power frequency voltage
and/or impulse voltage).
Testing for the off-circuit condition is effected
using a plugin indicator at the corresponding
socket pairs located among the controls on
the panels.
Use of the indicator:
• Carry out a functional test on the unit
immediately before use, e.g. with interface
tester KSP. The display must be clearly
perceptible
• The presence of operating voltage is displayed
by a signal
Always follow the details given in the instructions
for the particular indicator for your switchgear
system.
Interface testing:
• Perform an interface test as a functional test
on all coupling components, e.g. with interface
tester KSP
• The interface test is a repeat test as specified
in IEC 61243 Part 5
Always follow the details given in the instructions
for the particular indicator for your switchgear
system.
6.3.2 Testing of in-phase condition
Testing of the in-phase condition, e.g. when
there is more than one incoming feeder, can be
carried out with a suitable phase comparator
coupled to the measuring point sockets of the
capacitive voltage indication system (if fitted).
Test procedure
• Only use phase comparators which
comply with the DIN VDE standards
and are of suitable design for the
switchgear system
• Check the function of the unit immediately
prior to use
• Ensure that the maximum permissible length
of the measuring cables for each phase is
not exceeded
• Connect the measuring cables to precisely
the corresponding main conductor sections
• Follow the directions for the phase comparator
in detail
After commissioning of the system, check all
posi-tion indicators and displays for irregularities.
Note:
For voltage testing at power frequency and/or
impulse voltage:
• Only short-circuit the sockets for the
capacitive voltage indicator on the relevant
panel for the duration of the test
Caution:
Operate truck slowly, be careful overturning
Caused by inertia of fast movement!