At present, the application requirements of ATSE (Automatic Transfer Equipment) have become more and more important, and the technical performance requirements have become higher and higher. The technical level and reliability of products have directly affected the safety and reliability of electricity consumption in important locations. An indispensable part of the low voltage distribution system.
I. Contact Oxidation and Protection Problems Existing in ATSE Application For ATSE, the first concern is the safety and reliability of the device itself, and the power supply to the load cannot be affected due to the device's own fault. The ATSE itself will fail due to problems such as controllers, mechanical mechanisms, arcs, and contact oxidation. Some problems can now be resolved through technical means or other major methods. Contact oxidation is currently a prominent issue in ATSE products on the market. . Contact is oxidized, resulting in oxides, contact resistance increases, once put into use, the temperature rise of the contact may easily lead to interruption of power supply, affect production and life, and cause serious accidents.
At present, there are mainly four types of ATSE on the market, such as double contactor type, double circuit breaker type, double load switch type, single arm double throw type and the like. These ATSEs have two sets of main contacts with split arc function, and a set of spare contacts are open for a long period of time. In order to meet the arc extinguishing requirements, the contacts of the contactor and the circuit breaker are often selected by pairing of silver tungsten and silver tungsten carbide materials, which is favorable for breaking the arc. However, contact materials of this type are easily oxidized, and the standby contacts are exposed for a long time. A layer of poorly conductive and difficult to remove oxides is easily formed on the surface of the contacts. When the standby contacts are put into use, the temperature rise of the contacts may easily cause the switch to be destroyed or even destroyed. explosion. Especially in the basement, mining, chemical environment, salt spray environment, the oxidation problem is particularly prominent. In order to achieve the desired arc extinguishing effect and to solve the problem of contact oxidation, some prefer to use sterling silver or even gold to make contact. The gold contacts have better arc extinguishing performance and do not oxidize, but this also requires fast switching speed to ensure the arc extinguishing effect. For manual manual operation, due to differences in personnel strength and speed, it cannot be ensured that the switch completes the breaking and closing action quickly. When there is an arc at the time of load conversion, there will be contact with silver point consumption, fusion welding, and adhesion. Its failures and accidents also occur from time to time. In addition, due to the use of precious metals as a contact, the price is relatively expensive.
The ATSE requires three months of regular power for half an hour in order to remove contact oxides as required by industry regulations. Because it is not a frequently-operated device, because it is not used for a long time, everyone will not pay too much attention to its maintenance, and rarely think of maintaining it. Users who really can do maintenance are really rare. Once they are used, Can not guarantee normal work, affect the important load power supply, the consequences are quite serious. Under such circumstances, how to completely solve the problem of conversion arc and backup contact oxidation is extremely important.
II. Composition and Principles of CATSN CATSN series ATSE is a new generation of automatic switch developed and produced by Wuhan Chuangshiyuan Electric Co., Ltd. using its self-developed national patent technology, which is based on Schneider Electric's Multi9 miniature circuit breaker. Compact series molded case circuit breakers or load switches are actuators. The static contact adopts a double-blade type in which the movable contact is clamped tighter in the event of a short-circuit fault, and is equipped with an electromechanical and dual mechanical interlocking control mechanism. The mechanical mechanism unites the circuit breaker or the load switch with the transfer switch, and is powered by a single motor. The motor is operated once and the disconnection, switching, and closing operations are performed consecutively. This is applicable to various important power supply sites that cannot tolerate power failure. When a common power supply fails, it automatically converts the load from the normal power supply to the standby power supply. When the normal power supply returns to normal, the power supply can be automatically switched to a common power supply or not, and the standby power supply is still used, depending on the settings of the controller.
Third, the characteristics of CATSN CATSN has no load, no current, no arc when switching; contact without oxidation, anti-corrosion; a higher degree of safety, reliability; small maintenance of equipment, contacts without maintenance; long service life; Multi-loop switching, one can replace many and many other features, a good solution to the current conventional load with the ATSE's contact oxidation and protection problems.
(A) no load switching, no oxidation, corrosion resistance CATSN is the biggest feature is no load current, no arc switching action, the contact without oxidation. The switching method is characterized by the fact that the circuit breaker or the load switch is disconnected from the load circuit first, and then the double-cast transfer switch is switched under no load, and the circuit breaker or load switch is closed after the switch is completed.
This switch in the no-load state, because the double-cast switch is under no-load switching, no current through, there will be no arc, no arc, the contact will not be ablated, and do not consider the switch box The arc extinguishing device is added to perform the arc extinguishing treatment, and there is no need to worry about the external injection of the arc. The outer cover of the transfer switch can be completely sealed to completely seal the switch contact from the external environment, thereby avoiding the influence of external oxygen and corrosive gases.
It needs to be pointed out that mentioning this way is not a new thing from the point of view of the electrical circuit. This kind of manual operation has always existed in the distribution system, especially in the high voltage distribution system (operation of the circuit breaker and disconnector ). CATSN only applied this method to ATSE, and further increased safety protection measures such as interlocking, sealing, and conductive protection grease layer.
(II) Safe and reliable conversion, easy maintenance and long service life CATSN realizes no-load automatic switching between power supplies, eliminating the need to worry about contact oxidation and arcing, greatly improving the safety and reliability of the switching equipment, and improving the overall use. Electrical system safety and reliability. The contact is not oxidized, and the resistance value will not increase due to the oxide produced in the contact, resulting in a large number of heat ablating the contact. It is not necessary to regularly perform maintenance on the contacts, which greatly reduces the maintenance work of the equipment. The service life of the equipment is also excellently guaranteed.
IV. Main technical parameters of CATSN and its application CATSN series is divided into CB or PC according to the choice of circuit breakers or load switches; single motor drive; double interlocking of electrical machinery; mechanical interlock ensures that the equipment can only be operated in the normal sequence, and any insecurity The situation is mechanically limited; it has various specifications ranging from 1 to 630A, 3P, and 4P; overvoltage, undervoltage, voltage loss, phase loss, frequency, etc. detection; with power failure, circuit breaker tripping, and control The device mis-connects 380V, performs the function of breaking the circuit breaker handle, and the alarm of the circuit breaker contacts; it has three operations: automatic, key-operated, and handle operation. It has “self-retrieving, self-resetting†and “self-retrieveâ€. "Alternative to each other" three control options; with 0 to 30 seconds switching delay function; a fire signal, generator start signal; with feedback dry node and other interfaces. The CATSN series has passed the 3C certification of the China Quality Inspection Center. After undergoing multiple short-circuit fault currents, the transfer head has no traces of damage and the conductive grease is intact. After 6000 cycles of operation, the conductive grease layer on the contact surface is changed. Still the same.
From the perspective of product specifications, parameters and structural features, the CATSN series is suitable for the conversion of the rated current from 16 ~ 630A power supply, at an installation site altitude does not exceed 2km, ambient air temperature -25 °C ~ 55 °C, most of the non-explosive dangerous medium It can be used well in all occasions.
I. Contact Oxidation and Protection Problems Existing in ATSE Application For ATSE, the first concern is the safety and reliability of the device itself, and the power supply to the load cannot be affected due to the device's own fault. The ATSE itself will fail due to problems such as controllers, mechanical mechanisms, arcs, and contact oxidation. Some problems can now be resolved through technical means or other major methods. Contact oxidation is currently a prominent issue in ATSE products on the market. . Contact is oxidized, resulting in oxides, contact resistance increases, once put into use, the temperature rise of the contact may easily lead to interruption of power supply, affect production and life, and cause serious accidents.
At present, there are mainly four types of ATSE on the market, such as double contactor type, double circuit breaker type, double load switch type, single arm double throw type and the like. These ATSEs have two sets of main contacts with split arc function, and a set of spare contacts are open for a long period of time. In order to meet the arc extinguishing requirements, the contacts of the contactor and the circuit breaker are often selected by pairing of silver tungsten and silver tungsten carbide materials, which is favorable for breaking the arc. However, contact materials of this type are easily oxidized, and the standby contacts are exposed for a long time. A layer of poorly conductive and difficult to remove oxides is easily formed on the surface of the contacts. When the standby contacts are put into use, the temperature rise of the contacts may easily cause the switch to be destroyed or even destroyed. explosion. Especially in the basement, mining, chemical environment, salt spray environment, the oxidation problem is particularly prominent. In order to achieve the desired arc extinguishing effect and to solve the problem of contact oxidation, some prefer to use sterling silver or even gold to make contact. The gold contacts have better arc extinguishing performance and do not oxidize, but this also requires fast switching speed to ensure the arc extinguishing effect. For manual manual operation, due to differences in personnel strength and speed, it cannot be ensured that the switch completes the breaking and closing action quickly. When there is an arc at the time of load conversion, there will be contact with silver point consumption, fusion welding, and adhesion. Its failures and accidents also occur from time to time. In addition, due to the use of precious metals as a contact, the price is relatively expensive.
The ATSE requires three months of regular power for half an hour in order to remove contact oxides as required by industry regulations. Because it is not a frequently-operated device, because it is not used for a long time, everyone will not pay too much attention to its maintenance, and rarely think of maintaining it. Users who really can do maintenance are really rare. Once they are used, Can not guarantee normal work, affect the important load power supply, the consequences are quite serious. Under such circumstances, how to completely solve the problem of conversion arc and backup contact oxidation is extremely important.
II. Composition and Principles of CATSN CATSN series ATSE is a new generation of automatic switch developed and produced by Wuhan Chuangshiyuan Electric Co., Ltd. using its self-developed national patent technology, which is based on Schneider Electric's Multi9 miniature circuit breaker. Compact series molded case circuit breakers or load switches are actuators. The static contact adopts a double-blade type in which the movable contact is clamped tighter in the event of a short-circuit fault, and is equipped with an electromechanical and dual mechanical interlocking control mechanism. The mechanical mechanism unites the circuit breaker or the load switch with the transfer switch, and is powered by a single motor. The motor is operated once and the disconnection, switching, and closing operations are performed consecutively. This is applicable to various important power supply sites that cannot tolerate power failure. When a common power supply fails, it automatically converts the load from the normal power supply to the standby power supply. When the normal power supply returns to normal, the power supply can be automatically switched to a common power supply or not, and the standby power supply is still used, depending on the settings of the controller.
Third, the characteristics of CATSN CATSN has no load, no current, no arc when switching; contact without oxidation, anti-corrosion; a higher degree of safety, reliability; small maintenance of equipment, contacts without maintenance; long service life; Multi-loop switching, one can replace many and many other features, a good solution to the current conventional load with the ATSE's contact oxidation and protection problems.
(A) no load switching, no oxidation, corrosion resistance CATSN is the biggest feature is no load current, no arc switching action, the contact without oxidation. The switching method is characterized by the fact that the circuit breaker or the load switch is disconnected from the load circuit first, and then the double-cast transfer switch is switched under no load, and the circuit breaker or load switch is closed after the switch is completed.
This switch in the no-load state, because the double-cast switch is under no-load switching, no current through, there will be no arc, no arc, the contact will not be ablated, and do not consider the switch box The arc extinguishing device is added to perform the arc extinguishing treatment, and there is no need to worry about the external injection of the arc. The outer cover of the transfer switch can be completely sealed to completely seal the switch contact from the external environment, thereby avoiding the influence of external oxygen and corrosive gases.
It needs to be pointed out that mentioning this way is not a new thing from the point of view of the electrical circuit. This kind of manual operation has always existed in the distribution system, especially in the high voltage distribution system (operation of the circuit breaker and disconnector ). CATSN only applied this method to ATSE, and further increased safety protection measures such as interlocking, sealing, and conductive protection grease layer.
(II) Safe and reliable conversion, easy maintenance and long service life CATSN realizes no-load automatic switching between power supplies, eliminating the need to worry about contact oxidation and arcing, greatly improving the safety and reliability of the switching equipment, and improving the overall use. Electrical system safety and reliability. The contact is not oxidized, and the resistance value will not increase due to the oxide produced in the contact, resulting in a large number of heat ablating the contact. It is not necessary to regularly perform maintenance on the contacts, which greatly reduces the maintenance work of the equipment. The service life of the equipment is also excellently guaranteed.
IV. Main technical parameters of CATSN and its application CATSN series is divided into CB or PC according to the choice of circuit breakers or load switches; single motor drive; double interlocking of electrical machinery; mechanical interlock ensures that the equipment can only be operated in the normal sequence, and any insecurity The situation is mechanically limited; it has various specifications ranging from 1 to 630A, 3P, and 4P; overvoltage, undervoltage, voltage loss, phase loss, frequency, etc. detection; with power failure, circuit breaker tripping, and control The device mis-connects 380V, performs the function of breaking the circuit breaker handle, and the alarm of the circuit breaker contacts; it has three operations: automatic, key-operated, and handle operation. It has “self-retrieving, self-resetting†and “self-retrieveâ€. "Alternative to each other" three control options; with 0 to 30 seconds switching delay function; a fire signal, generator start signal; with feedback dry node and other interfaces. The CATSN series has passed the 3C certification of the China Quality Inspection Center. After undergoing multiple short-circuit fault currents, the transfer head has no traces of damage and the conductive grease is intact. After 6000 cycles of operation, the conductive grease layer on the contact surface is changed. Still the same.
From the perspective of product specifications, parameters and structural features, the CATSN series is suitable for the conversion of the rated current from 16 ~ 630A power supply, at an installation site altitude does not exceed 2km, ambient air temperature -25 °C ~ 55 °C, most of the non-explosive dangerous medium It can be used well in all occasions.
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