Universal type circuit breaker faults and solutions ( DW15 DW16 DW17 DW45 | | | )
Universal type circuit breaker because it is encased in a layer of the frame, so it is often referred to as the frame circuit breaker, this view is still very common. Universal type circuit breaker during use sometimes occur main contact closure or during closing to disconnect the fault, which caused some unnecessary damage. To study its reason, may have the following:
( 1 ) as a result of release coil often by large current, causing the coil overheating, causing instability.
( 2) because of the relay in high voltage, causing the contact surface oxidation, contact resistance, contact normal is.
( 3 ) as a result of motor stator, rotor misalignment in, mutual friction, generate a lot of heat, caused by motor speed instability, or even stop, causing the circuit breaker can not work normally.
In general the appearance of several phenomena, compared with common solutions include: relay contact oxidation, detachable relay housings, each contact with sandpaper shine. Back after installation, universal circuit breaker working in steady state. Discovery of rotor bearing inclination, if the rotor and stator friction condition. Value needs to be moved is bearing, after fixing with the cover test run, everything will return to normal.
Then the paper discusses the tripping device common breakdown and solution. Since electric equipment in the low voltage in case of abnormal operation and damage, the Acb are generally equipped with undervoltage tripper (the trip) to protect. In line voltage conditions or release when the fault occurs, circuit breaker can not work. Primary analysis of the following situations:
One, power quality caused by fault
In the existing universal circuit breaker, undervoltage tripping device mainly adopts an electronic circuit to control, and because the auxiliary function increases, there are more and more complex trend. But because domestic power 3 times, 5 times, 7 harmonics exist, these harmonic presence will make the connection to the main circuit of the undervoltage tripping device in the control circuit of the capacitor overheating, so that a trip failure, thereby affecting the entire circuit breaker using.
In two, the manufacturing defect caused by the fault of undervoltage tripper
Quality is produced, no first-class manufacturing processes, design is not only the current in the manufacturing, appearing in many questions, such as:
( 1) dynamic core pull face grinding uneven, can cause the AC noise, burned coil;
( 2) coil winding of pull too tight will affect the interturn insulation of;
( 3) wound after impregnation process can not effectively prevent the breakdown between adjacent turns;
( 4) coil lead wire welding is not firm will be in operation after a certain period of the break line fault;
( 5) the electronic control part of electronic components screening lax, aging is not enough, will make the components in operation after a certain period of time is invalid, the tripping device damage.
Three, structure design defects caused by tripping device fault
Undervoltage tripping device includes at least a dynamic, static iron core and the coil, the electronic circuit controlled release also includes electronic circuit. In the first, the two generation of universal circuit breaker by direct power control of aid type under-voltage releaser structure, since the operating environment pollution or suction aid structure thrust is not, will cause the dynamic iron core is not reliable, while the running of AC noise. When the coil current becomes large, core loss increased, resulting in heating of the coil burning.
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