15
No. Fault phenomena Reasons
1 Failure to closing
1. The breaker is in the closing position state
2. The handcart does not fully come into operation position or test position
3. The closing locking device is employed and the auxiliary supply is
unconnected or lower than the specifications
4. secondary circuit is incorrect
2
The handcart cannot be
pushed in or pulled out
1 The breaker is in the closing position state
2 The pushing- handle is not fully inserted into the pushing hole.
3. The pushing mechanism is not fully placed at the test position, so that the
clapper cannot be unlocked with the cabinet body
4. The cabinet body earthing interlocking is not released
7-3 The commissioning and operation work shall be carried out by specially trained personnel who
have a detailed understanding of the performance of the circuit breaker. The corresponding protection
and prevention measures must be considered in the work.
One of the preconditions for trouble free operation is to use the circuit breaker under normal working
conditions according to the corresponding provisions of GB /T 1984 and IEC 60694 standards.
● C
heck the circuit breaker for damage or any other harmful environmental impact. If there is such a
phenomenon, it should be eliminated before power on to restore to normal working conditions.
●
Remove dirt, especially on the surface of insulating parts. These may be due to contamination during
transportation or storage, which may affect the insulation performance of the product.
● C
heck the connection status of primary circuit contact, secondary circuit connection and grounding body.
●
Manual operation test.
8.
Maintenance
Maintenance must be carried out by AEG personnel or the user's personnel who are familiar with the
equipment and have been trained and qualified. If the maintenance is carried out by the user's personnel,
the user shall be responsible for the consequences of the repair.
8-1 During normal use, the circuit breaker is free of maintenance. Because the circuit breaker has the
characteristics of simple structure and durability, it has a long service life. The maintenance work is
related to the wear and aging of parts. In order to make the circuit breaker work reliably, the interval time
and range of maintenance work needed to be carried out will depend on the influence of working
environment, operation times, operation time and short circuit current breaking times and other factors.
8-2 Before maintenance, all auxiliary power supply must be disconnected and there is no danger of
power transmission again. The circuit breaker itself is open and the spring is not stored energy. In order to
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