Introduction: in the petrochemical and textile industries in certain have certain achievements of multi-functional products low voltage switchgear, in the electrical input, distribution and conversion between the electrical energy plays a key role. Low-voltage switchgear is defined as one or several low-voltage switchgear and it has a certain connection with the control, protection, regulation function of a device. Its internal electrical and external mechanical connections need to be completed by the manufacturer, can be called a combination of body, because it also needs some structural components to cooperate and then assembled to complete. Now let's go to understand the low-voltage switchgear schematic diagram.
First, the use of conditions
1. Ambient temperature should be between -5 ℃ to +40 ℃, the average temperature of the day can not be greater than +35 ℃
2. Air to keep clean, in the control of temperature at the same time, the humidity is also corresponding to the control of the temperature is very high, its humidity can not be greater than 50 ﹪. When the temperature is not high, the humidity requirements are not so high.
3. Installation site selection conditions are the degree of pollution and altitude, its highest altitude can not be more than 2000 meters above sea level.
Second, the principle
High and low voltage switchgear circuit breakers will appear circuit breakers and closing phenomenon, the circuit breaker to close the operation if there is no source of contacts into the circuit breaker will be closed often working contacts, the circuit breaker in the opening operation of the circuit breaker its red analog strips appear luminous phenomenon, the circuit breaker will close often closed contacts, the circuit breaker will be closed often working contacts, the circuit breaker in the opening operation, the circuit breaker will be closed often closed contacts. The circuit breaker will close the frequently closed contacts, and then the green analog strip will appear to glow. The working position of the circuit breaker will show the current contact closure, if the contact is in the closed state, the circuit breaker is in the working position at this time.
Third, features
1. Reasonable design: its design is a combination of some electrical switches such as escape port, figure production and so on some of their characteristics and complete the unitization
of the design.
2. Common structure: its combination of installation is very flexible: its unique C profile structure is consistent with the common profile can be common.
3. Standardized module: it has standardized changes in the protection module, operation module, conversion module, control module, etc., and its unit
a certain block structure can be chosen arbitrarily.
4. The safety of protection: the necessary isolation between the various areas and some functional units in the incoming operation and the emergence of the operation of the isolation between them, in the process of the two kinds of isolation, the use of the protection function with a high degree of security.
5. Technical parameters: the technical parameters of the low-voltage switchgear are now in the international occupation of the first position.
Classification
(1) Fixed:
Can meet the electrical components are reliably fixed in the cabinet to determine the location. Cabinet shape is generally cubic, such as screen, box, etc., there are also prismatic body such as desktop. This cabinet has a single column, there are also arranged.
In order to ensure that the cabinet shape size, often take a step-by-step combination of components, generally composed of two pieces or left and right sides, and then composed of the cabinet, or first to meet the requirements of the shape, and then connected to the cabinet in turn the internal support parts. Composition of the cabinet body of each prong of the length of the parts must be correct (tolerance take the negative value), in order to ensure that all aspects of the geometric dimensions, so as to ensure the overall shape requirements. For both sides of the cabinet, because of the need to consider the arrangement, there can be no bulging phenomenon in the middle.
In order to easily adjust to offset the accumulation of tolerance, the cabinet width tolerance are taken as a negative value. Cabinet after the completion of the various components of the body, as needed, should also be shaped to meet the requirements of each part of the shape and size. For stereotypes or batch of larger cabinets should be fully considered when manufacturing with jigs and fixtures to ensure that the structure of the correct unity of the jigs and fixtures to take the bottom of the base surface for the proper, fixtures in the arrangement of the positioning blocks to work to take out the convenience of whichever is appropriate, for the cabinet of the outer door and so on because of susceptible to transportation and installation, generally in the installation of the unified adjustments.
2) pull-out type:
Pull-out type is composed of a fixed cabinet and the main electrical components such as switches and other removable devices, removable part of the removal to be light, move into the positioning to be reliable, and the same type and specifications of the drawer can be reliably interchanged, the cabinet part of the cabinet in the pull-out type of the processing method is basically similar to that of the cabinet in the fixed type. But because of the interchangeable requirements, the accuracy of the cabinet must be improved, the structure of the relevant parts to have enough adjustment, as for the removable part of the device, to be able to move to change, but also to reliably bearing the main components, so there should be a high mechanical strength and high precision, and the relevant parts of the adjustable part of the sufficient amount.
The process of manufacturing drawer-type low-voltage cabinets is characterized by: (1) fixed and removable parts of a unified reference frame; (2) the relevant parts must be adjusted to the optimal position, the adjustment of the application of special standard tooling, including standard cabinets and standard drawers; (3) the key dimensions of the error can not be overdone; (4) the same type and specifications of the drawer interchangeability to be reliable.
The above is about the low-voltage switchgear schematic diagram, I hope it can help you!
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