Overview
XL-21 low-voltage power distribution cabinet is suitable for power distribution in power plants and industrial and mining enterprises, which is used in three-phase four-wire or tn-s systems with AC voltage below 500 volts. XL-21 low-voltage power distribution box is installed against the wall and overhauled before the screen.
Type meaning
Design feature
XL-21 low-voltage power distribution cabinet is closed, and its shell is bent with steel plate. The operating handle of knife switch is installed on the upper part of the right column in front of the cabinet, which can be used for switching power supply. A voltmeter is installed in front of the distribution box to indicate the bus voltage. There is a door in front of the distribution box. After the door is opened, all equipment in the distribution box will be exposed for easy maintenance. This distribution box adopts self-designed components in China, which is characterized by compact structure, convenient maintenance and flexible combination of circuit schemes. In addition to air switch and fuse as short circuit protection, the distribution box is also equipped with contactor and thermal relay, and the front door of the box can be equipped with operation buttons and indicator lights.
Regular service conditions
◇ Ambient temperature: -50℃ ~+40℃ , and the average temperature within 24h shall not exceed+36℃ ;
◇ Altitude: no more than 2000m；
◇ Relative humidity: when the ambient air humidity is +40℃ , it shall not exceed 50%; Under lower humidity, it can have higher relative humidity (for example, 90% at +20℃ ). Considering the change of temperature, it is allowed to produce moderate frost;
◇ When the equipment is installed, the inclination with the vertical plane shall not exceed 5, and the equipment shall be installed in a place without violent vibration, impact and corrosion.
Use, maintenance and overhaul
After installation or maintenance, the power distribution box shall be inspected and tested as follows before being put into operation (the inspection and test after maintenance depends on the quality of maintenance).
◇ Check whether the electrical equipment and secondary wiring installed inside the power distribution cabinet meet the drawing requirements.
◇ Check whether the knife switch and air switch used for operation are flexible and have no jam.
◇ Check whether the contact of the installed electrical equipment is good and whether it meets the use requirements of the electrical equipment itself.
◇ Check whether there are other foreign bodies inside the power distribution cabinet and whether there are loose solid screws in each part.After installation or maintenance, the power distribution box shall be inspected and tested as follows before being put into operation (the inspection and test after maintenance depends on the quality of maintenance).
◇ Check whether the electrical equipment and secondary wiring installed inside the power distribution cabinet meet the drawing requirements.
◇ Check whether the knife switch and air switch used for operation are flexible and have no jam.
◇ Check whether the contact of the installed electrical equipment is good and whether it meets the use requirements of the electrical equipment itself.
◇ Check whether there are other foreign bodies inside the power distribution cabinet and whether there are loose solid screws in each part.
Outline installation dimension
◇ See fig. 1 for the appearance and installation dimensions of type a structure of power distribution cabinet.
◇ See fig. 2 for the appearance and installation dimensions of b-type structure of power distribution cabinet.
Ordering instructions
The customer shall provide the following information when ordering:
◇ Primary line scheme and single-line system diagram;
◇ Deployment system diagram of secondary line;
◇ Detailed specifications and data of various electrical equipment installed in each box;
◇ When ordering B-type structure, the arrangement diagram and layout diagram of power distribution cabinet shall be provided.
