What should I pay attention to when installing and debugging power distribution cabinets in Thailand?

In Thailand, it is necessary to follow the general electrical safety specifications and technical requirements, and also consider the local special situation in Thailand. The following is a detailed introduction for you:

Precautions for installation of power distribution cabinet

Understand local standards: Thailand's electrical standard system is TIS(Thai Industrial Standards), which is similar to IEC standards in many aspects, but there are still some differences. For example, the TIS standard may have specific provisions on the requirements of grounding system and the protection level of electrical equipment. Before installing the distribution cabinet, be sure to thoroughly understand and strictly follow these standards.

Check the installation environment: the power distribution cabinet should be installed in a dry and well-ventilated place to avoid equipment damage caused by humidity or poor air circulation. At the same time, it is necessary to ensure that there is enough space in the installation position to facilitate subsequent operation, maintenance and overhaul. For example, at least 80 cm of passage space should be reserved around the distribution cabinet. In addition, it is necessary to consider the local climatic conditions in Thailand, such as high temperature and heavy rain, and take corresponding protective measures, such as installing air conditioning equipment to cool down and setting waterproof baffles to prevent rainwater from invading.

Ensure the foundation is firm: the foundation of the power distribution cabinet should adopt a horizontal and firm structure to prevent the power distribution cabinet from shaking or tilting during operation, which will affect the normal operation of the equipment. The foundation can be made of concrete or channel steel, and the height of the foundation should be determined according to the actual situation, and it is generally recommended to be between 10 and 20 cm. Before installing the distribution cabinet, the foundation shall be inspected to ensure that the levelness error does not exceed 5mm, and the foundation surface shall be smooth and crack-free.

Standardize the connection of cables: the connection of cables should be firm and reliable, so as to avoid looseness and virtual connection, so as not to cause electrical accidents. Before connecting the cable, the cable should be inspected to ensure that its appearance is undamaged and its insulation performance is good. The cable connection mode can be selected according to the actual situation, such as crimping, welding or bolt connection. When crimping is used, special crimping tools should be used to ensure firm crimping; When using welding method, we should pay attention to welding quality to avoid false welding and missing welding. When bolt connection is adopted, appropriate bolts and nuts should be used, and the tightening torque should meet the requirements. At the same time, in order to facilitate identification and maintenance, cables with different functions should be marked, and the marking content should include information such as the number, specification, starting point and end point of the cable.

Matters needing attention in power-on debugging of distribution cabinet

Personnel qualification and safety protection: the personnel conducting power-on debugging must have professional electrical knowledge and skills and hold a valid electrician certificate. During commissioning, operators should strictly abide by the safety operation rules and wear necessary safety protection articles, such as insulating gloves, shoes and helmets. At the same time, obvious safety warning signs should be set on the site to prevent irrelevant personnel from entering the commissioning area and ensure the safe commissioning work.

Check the power distribution cabinet again: Before power-on and commissioning, conduct a comprehensive inspection of the power distribution cabinet to ensure that the installation quality of the equipment meets the requirements. The inspection contents include whether the electrical components in the power distribution cabinet are firmly installed, whether the wiring is correct and reliable, and whether there is looseness or virtual connection; Whether the bus bars in the distribution cabinet are arranged neatly, whether the phase sequence is correct, and whether the bus bars are closely connected with electrical components; Whether the grounding system of the distribution cabinet is good and whether the grounding resistance meets the requirements; Whether the secondary circuit wiring in the power distribution cabinet is correct, and whether the actions of various electrical components are sensitive and reliable; Whether the protective door of the distribution cabinet is tightly closed and whether the door lock works normally; Whether the appearance of the power distribution cabinet is neat, damaged and deformed, etc. Only after ensuring that all the inspection contents of the power distribution cabinet meet the requirements can the power-on debugging be carried out.

No-load first and then load debugging: No-load debugging refers to power-on debugging when the distribution cabinet is not loaded. Through no-load debugging, you can check the operation of various electrical components in the distribution cabinet, such as whether the actions of circuit breakers, contactors and relays are normal, whether the contacts of various electrical components are in good contact, and whether there is overheating and ignition. At the same time, you can also check whether the instruments and indicator lights in the power distribution cabinet work normally and whether the display is accurate. In the process of no-load debugging, the voltage should be gradually increased, and the operation of each electrical component in the distribution cabinet should be observed. If there is any abnormality, the debugging should be stopped immediately, and the debugging can be continued only after finding out the reason and troubleshooting. The no-load debugging time is generally not less than 2 hours. During the no-load debugging, the operation of each electrical component in the distribution cabinet should be checked every 30 minutes and recorded. Only after no-load debugging is qualified can load debugging be carried out.

Real-time monitoring of operation parameters: During the power-on debugging, professional testing instruments should be used to monitor the operation parameters of the distribution cabinet in real time, such as voltage, current, power and power factor. By monitoring these operation parameters, we can know the operation status of the distribution cabinet in time and judge whether the equipment is running normally. For example, when the voltage is detected to be too high or too low, it may affect the normal operation of electrical equipment or even damage the equipment. At this time, stop debugging immediately, check the cause of abnormal voltage and deal with it; When excessive current is detected, it may lead to overheating of electrical components and lead to electrical accidents. At this time, stop debugging immediately, check the cause of excessive current and deal with it. In the process of monitoring operation parameters, the monitoring data should be recorded at regular intervals and analyzed, so as to find problems in time and take corresponding measures to deal with them. At the same time, the monitoring data should be compared with the rated parameters of the power distribution cabinet to ensure that the operating parameters of the power distribution cabinet are within the rated range, so as to ensure the safe and stable operation of the equipment.