Isolating switch failure analysis and maintenance
Isolating switch for isolating function, because of its simple structure, strong reliability, which has a very wide use. However in the use process, there will be problems, understanding the isolating switch common faults analysis and maintenance method is very necessary.
Isolating switch in operation, since the contact screw loosening of the components, leading to poor contact, thereby the blade or knife mouth spring leaf rust or overheating, can make the spring pressure is reduced, the knife gate in a disconnected when the contact is exposed in the air, prone to oxidation and contamination. Knife switch in operation may have arc, burns, the touching surface of the static contact, each linking part wear will occur or deformation, influence of contact surface contacts. And in the process of operation, if forced to the inappropriate location of contact pressure is insufficient, poor contact caused by the pile head overheating. This can be according to the contact portion of the paint or the temperature indication sheet color changes and melting degree to judge, can also according to blade color to color, and redness, spark phenomenon to determine. These methods mainly have the following:
One, the knife gate refused to pull, closing the deal
In 1, refused to pull brake to: when the switch is not pulled, don't force, especially the bus side switches. Find out the causes and then pull. In the absence of find out the causes of the former should not forced open, otherwise may cause equipment damage accident. At this time only by changing the operation mode and timely apply for maintenance.
In 2, refused to close : when the knife is not closing, should identify the reasons. First check the latching loop and a sequence of operations if it meets the requirements, and then check the shaft pin is off, whether there is a wedge bolt withdrawl, fracture of cast mechanical fault. Electric mechanism should check whether the motor loses electricity and the electric circuit fault. If you still have not found the reason, as should apply for maintenance.
Then talk about the isolation switch maintenance mode, generally can be used the following methods:
( 1) removal of insulator surface dirt, at the same time, check whether the breakage, cracking and other defects; iron fittings and porcelain pieces and stick firmly, insulation resistance is qualified.
( 2) electrically conductive contact surface, no oxidation, current-carrying parts without severe depression and corrosion. If there is a slight burning black marks, usable fine Shabu abrasive repair after rinsed with gasoline, then coated with a layer of thin industrial Vaseline; serious loss, unable to repair parts should be replaced.
( 3) knife and a static contact contact, using 0.005mm feeler inspection, longitudinal insertion depth is less than 5mm; the pressure of springs on both sides evenly, in line with the original products regulations.
( 4) isolating switch and operating mechanism of repair and adjustment should be performed after the trial operation of qualified. Mechanical handle up to reach the terminal, isolating switch must arrive at the closed end; the handle downward to reach the terminal, isolating switch must reach the gate terminal. After disconnection of the same pole contact and the distance between the product provided with knife. During operation is not allowed to have stuck or other prevent action of abnormal phenomenon.
( 5) terminal contact is good, and bus connections properly, should not make the isolation switch subjected to mechanical stress.
( 6) isolating switch and the operating mechanism of all fastening parts should be fastened. Operating mechanism of the auxiliary switch action should be correct and reliable.
( 7) maintenance should be performed after the following test: 1) insulation resistance; 2) electric operation mechanism of coils of the lowest action voltage; 3) operation of the action of the mechanism, and the pressure of the spring contact.
The above is some very practical isolating switch failure analysis and maintenance of some means, in the work if problems occur, can be timely and effective help us to analyze and solve problems.
Two / knife switches contact superheat treatment
In 1, with temperature indication sheet retest or with infrared thermometer measurement, contact the actual if the temperature exceeds the specified value (70 degrees C ) should identify the reasons for the timely processing.
2, if the bad contact conductive portion of appearance inspection, edge and contact discoloration, are available for the corresponding voltage level of the insulating rod pushing foot, improve the contact condition. But the force can not be too fierce, to prevent slip made expansion of the accident.
Three / knife switch porcelain outer damage or serious flashover phenomenon
The 1, should immediately report to the dispatcher, as soon as possible, in the blackout before treatment should strengthen surveillance.
2, if the porcelain have larger breakage or discharge, should adopt a disconnect switch power supply.
3, prohibit the use of itself knife switch off the load and ground ( 35kV voltage level and below ).
Four, knife refused to pull, closing the deal
In 1, refused to pull brake to: when the switch is not pulled, don't force, especially the bus side switches. Find out the causes and then pull. In the absence of find out the causes of the former should not forced open, otherwise may cause equipment damage accident. At this time only by changing the operation mode and timely apply for maintenance.
In 2, refused to close : when the knife is not closing, should identify the reasons. First check the latching loop and a sequence of operations if it meets the requirements, and then check the shaft pin is off, whether there is a wedge bolt withdrawl, fracture of cast mechanical fault. Electric mechanism should check whether the motor loses electricity and the electric circuit fault. If you still have not found the reason, as should apply for maintenance.
Then talk about the isolation switch maintenance mode, generally can be used the following methods:
( 1) removal of insulator surface dirt, at the same time, check whether the breakage, cracking and other defects; iron fittings and porcelain pieces and stick firmly, insulation resistance is qualified.
( 2) electrically conductive contact surface, no oxidation, current-carrying parts without severe depression and corrosion. If there is a slight burning black marks, usable fine Shabu abrasive repair after rinsed with gasoline, then coated with a layer of thin industrial Vaseline; serious loss, unable to repair parts should be replaced.
( 3) knife and a static contact contact, using 0.005mm feeler inspection, longitudinal insertion depth is less than 5mm; the pressure of springs on both sides evenly, in line with the original products regulations.
( 4) isolating switch and operating mechanism of repair and adjustment should be performed after the trial operation of qualified. Mechanical handle up to reach the terminal, isolating switch must arrive at the closed end; the handle downward to reach the terminal, isolating switch must reach the gate terminal. After disconnection of the same pole contact and the distance between the product provided with knife. During operation is not allowed to have stuck or other prevent action of abnormal phenomenon.
( 5) terminal contact is good, and bus connections properly, should not make the isolation switch subjected to mechanical stress.
( 6) isolating switch and the operating mechanism of all fastening parts should be fastened. Operating mechanism of the auxiliary switch action should be correct and reliable.
( 7) maintenance should be performed after the following test: 1) insulation resistance; 2) electric operation mechanism of coils of the lowest action voltage; 3) operation of the action of the mechanism, and the pressure of the spring contact.
The above information by the country electric switch factory for you, www.jiandq.com 15957745520