Why is a temperature and humidity controller required for low-voltage switchgear?
Release time:
2022-10-18
Source:
Why use a temperature and humidity controller for low-voltage switchgear? Low-voltage switchgear is used in a wide range of applications, and high-voltage switchgear is one of the critical electrical devices for the generation, dispatch, and transmission of electrical energy. During operation, various simple factors can cause high-voltage switchgear to overheat. As for low-voltage switchgear, I would like to remind everyone that when such overheating occurs, it is essential to carry out timely maintenance to prevent potential incidents.
Why is a temperature and humidity controller required for low-voltage switchgear?
Why use a temperature and humidity controller for low-voltage switchgear? Low-voltage switchgear is used in a wide range of applications, and high-voltage switchgear is one of the critical electrical devices for the generation, dispatch, and transmission of electrical energy. During operation, various simple factors can cause high-voltage switchgear to overheat. As for low-voltage switchgear, I would like to emphasize that when such overheating occurs, it is essential to carry out timely maintenance to prevent potential incidents.
A critical factor jeopardizing the stable operation of low-voltage switchgear is the temperature and humidity within the high-voltage switchgear. When the ambient humidity inside the high-voltage switchgear is high, the flame-retardant properties of its insulating components deteriorate. As these properties decline, the insulating materials themselves tend to absorb moisture from the surrounding gas, further reducing their dielectric strength. This vicious cycle can persist, ultimately leading to failure of the insulation layer. Consequently, high-voltage conductors may discharge to ground through the faulty insulation, causing short-circuit faults, tripping of protective devices, and even damage to equipment—severely compromising the stable operation of the power grid and associated machinery.
Why, then, is a temperature and humidity controller used in low-voltage switchgear? Let’s explore this together with low-voltage switchgear!
1. When high- and low-voltage switchgear is installed in southern regions, the high summer temperatures combined with high ambient humidity—and the heat generated by the operation of internal components such as isolating switches—can easily lead to safety incidents. However, if a control panel is used to operate ventilation fans for dehumidification and cooling, the equipment can still be maintained at an appropriate operating temperature.
2. If the low-voltage switchgear is equipped with a temperature controller, various electrical control cabinets can operate under specified conditions. For example, in northern regions during winter when ambient temperatures are extremely low—typically ranging from –5°C to –30°C or even lower—immediate operation of household appliances without prior preparation can cause significant damage. In such cases, the control panel first activates an electric heater to raise the cabinet’s internal temperature to an optimal level for the proper functioning of the connected appliances, thereby reducing the likelihood of malfunctions and extending the service life of the equipment.
3. The issue of condensation has been effectively addressed through the use of temperature and humidity controllers. Condensation and contamination are the primary causes of safety incidents in high- and low-voltage switchgear, center-mounted cabinets, terminal boxes, and other equipment. Prolonged dense fog can even lead to complete power outages, with faults often remaining undetected for extended periods—mainly due to condensation.
Assembly of Low-Voltage Switchgear
1. Fabrication and assembly of low-voltage switchgear bases
Low-voltage switchgear bases are typically fabricated from channel steel, with the steel specifications and dimensions determined based on the switchgear’s overall dimensions and net weight. The channel steel is first flattened and straightened before being cut to size.
2. Unpacking and Inspection of Low-Voltage Switchgear
Prior to installation, the low-voltage switchgear shall be unpacked and inspected for the certificate of conformity and product manual. Next, verify that the switchgear is intact and undamaged, and then record the key inspection findings in the “Equipment Unpacking Inspection Record.”
3. Assembly of Low-Voltage Switchgear
The low-voltage switchgear shall be securely installed on the foundation channel steel, with inter-cabinet anchor bolts tightened. During floor leveling and levelness verification, the switchgear shall be electrically welded to the foundation channel steel. In addition, a 6 mm flexible copper conductor shall be used to connect the switchgear to the grounding main busbar for earthing protection.
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