Secondary Protection Testing; Protection Testing By Primary Current Injection - ABB ZX0 Manual For Installation And Operation

5.4 Secondary protection
testing
Comply with the safety regulations to EN 50110.
− Isolate the feeder panel to be tested in accordance with
section 4.
− Test the switchgear section for the off-circuit condition as
described in section 5.1
− Earth the outgoing feeder and secure the working area in
accordance with section 4 and EN 50110 standard.
− Switch the mcbs of the relevant operating mechanisms
1)
off in order to prevent the outgoing feeder being energized
by remote control.
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Voltage may only be applied to the OFF release
coil of the circuit-breaker (shunt release OFF) for a
period of 1000 ms. If this time is exceeded the coil will burn
out. For this reason, the protection testing system must be
shut down by the OFF command, or the shunt release OFF
must be disconnected.
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If the circuit-breaker is also to be tested, please
note that earthing via the circuit-breaker is can-
celled when the breaker is opened. Otherwise, disconnect the
release coil before testing.
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Note that when the voltage signals from the volt-
age transformers in the panel to be tested are
used by other panels, the signals are not available during the
work. This can lead to impairments of function in the other
panels.
− Establish the test circuit in accordance with the protection
tester manufacturer's directions and perform the test.
mcb: miniature circuit-breaker
1)
5.5
Direct access to the conductors for performance of protection
tests by primary current injection is possible via the fitted cable
connectors. The test current is applied via suitable testing sets for
the cable connector system used.
− Isolate the relevant switchgear section in accordance with
section 4.
− Test the switchgear section for the off-circuit condition as
described in section 5.1.
− Earth the switchgear section and secure the working area
in accordance with section 4 and EN 50110 standard.
− Switch the mcbs
off in order to prevent the switchgear section being ener-
gized by remote control.
− Observe the example of primary side test circuits in figures
5.5.1.
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celled when the breaker is opened. Otherwise, disconnect the
release coil before testing.
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used by other panels, the signals are not available during the
work. This can lead to impairments of function in the other
panels.
?
Fig. 5.5.1: Test circuit
Test transformer
Protection testing by
primary current injection
Comply with the safety regulations to EN 50110.
of the relevant operating mechanisms
1)
If the circuit-breaker is also to be tested, please
note that earthing via the circuit-breaker is can-
Note that when the voltage signals from the volt-
age transformers in the panel to be tested are
Do not exceed the maximum values for the current
testing plug (see the section on accessories).
Manual ZX0 HB 600 en - Revision 05 | 67