T E S T P R O C E D U R E S
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5.2 Testing for the in-phase condition
Testing for the in-phase condition, e.g. when
there is more than one incoming feeder, can be
performed with a suitable phase comparator at
the measuring sockets of the capacitive voltage
indication system.
The phase comparator must comply with IEC
62243 and correspond to the technical design of
the indicator system used.
Observe the instruction manual for the
phase comparator.
5.3 High-voltage tests
Direct access to the conductors via the fitted
cable connectors is available for the performance
of high-voltage tests. The test voltage is applied
through suitable test sets for the outer cone
connector system used.
5.3.1 Cable tests with dc
Do not exceed the maximum test
voltages and the maximum test duration
as specified in IEC 60502-2.
Comply with the safety regulations to EN
50110.
•
Isolate the switchgear section 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 switchgear section and secure the
working area in accordance with section 4 and
EN 50110 standard.
•
Switch the mcbs
1)
of the relevant operating
mechanisms off in order to prevent the
switchgear section being energized by remote
control.
•
Dismantle the cover on the relevant cable
termination compartment.
Isolate all voltage transformers inside the
switchgear section to be tested by
operating the isolating device (see
chapter 4.4) (Isolating of voltage sensors
is not necessary).
Dismantle any surge arresters in the
relevant outgoing feeder.
Short-circuit the sockets for the capacitive
indicator system in the relevant switchgear
section using the short-circuiting plug.
•
Fit the high-voltage testing set in accordance
with the manufacturer’s instructions.
•
Establish the test circuit in accordance with the
manufacturer’s directions for the test apparatus.
•
De-earth the switchgear section to be tested
before switching the test voltage on.
•
Perform the cable test in accordance with the
manufacturer´s directions for the test apparatus.
•
Earth the switchgear section after completion of
parts of the test and on conclusion of testing.
•
Remove the high-voltage testing set.
•
Refit any dismantled surge arresters.
•
Close off free outer cones with insulating
blanking plugs in accordance with the
manufacturer’s instructions.
•
Remove the short-circuiting plugs from the
capacitive indicator.
•
Reconnect the voltage transformers by
operating the isolating device (see section 4.4).
•
Refit the cover on the cable termination
compartment.
5.3.2 Voltage test of the main circuit
Perform a voltage test on the busbar after
installation. We recommend feeding in the test
voltage via an incoming or outgoing feeder panel.
Use high-voltage testing sets for the outer cones.
The test voltage can also be applied directly to
the busbars. In this case, special test plugs for
connection to the busbar adapters of any panel
are required.
In the course of testing, the test voltage
is applied in sequence to every conductor
in the main circuit, with the other
conductor earthed. Testing should be
performed with at least 80 % of the rated
short-duration power frequency
withstand voltage (UD) as stated on the
name plate. Testing with 100 % of the
rated short-duration power frequency
withstand voltage as stated on the name
plate is possible. Comply with the test
conditions as set out in IEC 62271-200 |
GB 3906.
Comply with the safety regulations to EN
50110.
•
Isolate the switchgear section 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 switchgear section and secure the
working area in accordance with section 4 and
EN 50110 standard.
•
Switch the mcbs
1)
of the relevant operating
mechanisms off in order to prevent the switchgear
section being energized by remote control.
If there are isolatable voltage transformers
or sockets for these within the section of
the system to be tested, use the isolating
device to isolate them (see section 4.4)
(Isolating of voltage sensors is not
necessary).
Remove the busbar voltage transformers
within the section of the system to be
tested, and close off all cross and end
adapters with the insulating plugs
provided (see section 2.2.3) (Isolating of
voltage sensors is not necessary).
•
Remove any surge arresters fitted in the section
of the system to be tested in accordance with
the manufacturer’s instructions.
•
Short-circuit the sockets for the capacitive
indicator system in the relevant switchgear
section using the short-circuiting plug.
•
Connect the test transformer to the test plug or
test cable and earth the other two phases of
the test system.
•
Connect the second terminal of the test
transformer to system earth.
•
Close the switch-disconnector and the circuit
breaker in the panel through which the test
voltage is to be applied. Open the
switch-disconnectors and circuit breakers in all
the other panels. If the test voltage is applied
via the busbar, open all circuit breakers and
switch-disconnectors.
•
Perform the high-voltage test.
•
Earth the system section on completion of
individual tests and on conclusion of testing.
•
Remove the high-voltage testing sets.
•
Fit any surge arresters and voltage transformers
required.
•
Close off free outer cones with insulating
blanking plugs in accordance with the
manufacturer’s instructions.
•
Cancel any isolation of voltage transformers.
•
Remove the short-circuiting plugs from the
capacitive indicator.
•
Eintended use at regular intervals.
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
1)
of the relevant operating
mechanisms off in order to prevent the outgoing
feeder being energized by remote control.
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.
If the circuit breaker is also to be tested,
please note that earthing via the circuit-
breaker is cancelled when the breaker is
opened. Otherwise, disconnect the release
coil before testing.
—
Fig. 5.4.1
1) mcb: miniature circuit breaker.
—
Fig. 5.4.1 Sensor test
adapter (example for
connection of one
current sensor per
phase)
Connections for the protection tester
