博文

Main points of dust proof and waterproof design for outdoor cabinet

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The main points of dust proof and waterproof design for outdoor cabinet: mainly for three places to carry out sealing treatment, so that the environment and the outside environment in a certain degree of isolation, to achieve the final design purpose. First of all, there are good dustproof measures for the cabinet to ensure the normal operation of the equipment. We begin with the seams of the cabinet, the joint part, the line interface, the design of the air duct and the fastening parts of the fasteners, because the dust and water in various environments enter the cabinet by these ways.
Main points of dust proof and waterproof design of cabinet
1.Air inlet and outlet: using maze structure and dustproof net to achieve dustproof and waterproof purposes.
2.The gap between the air duct joint: install the sealing strip or apply the sealant to achieve the purpose of protection.
3.Cabinet door: install sealing strip (EPDM) to achieve the purpose of dustproof and waterproof.
4.Lock installation: …

The heat dissipation method of the inverter

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1.Natural heat dissipation
The cooling method of natural heat dissipation of solar inverter refers to the purpose of realizing the temperature control of the local heating device to the surrounding environment without using any external auxiliary energy. It usually includes three main heat transfer modes, heat conduction, convection and radiation, in which the convection is dominated by natural convection. Natural heat dissipation or cooling is often applied to low power devices and components with low temperature control and heat flow density, and sealed or densely packed devices are not suitable for other cooling technologies. At present, the single-phase inverter and the three-phase inverter under 30kW, most of the manufacturers can achieve natural heat dissipation, and a few three phase inverters of 100kW can also achieve natural heat dissipation. 2.Forced heat dissipation
The cooling method of forced cooling is mainly by means of fans and other forced devices around the air flow, …

Can UPS transformer improve the reliability and stability of UPS system?

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High temperature is the main factor that causes the most likely failure of electronic devices including UPS. At high temperature, the leakage current of the device increases and the voltage decreases. According to Arrhenius’ law, when the ambient temperature is 25 degrees centigrade, the life of components or equipment is reduced by half at 10 degrees centigrade. When the temperature rises according to the arithmetic gradient of 10 degrees, the life of components or equipment will decrease which follow 1/ (n=1, 2, 3…) the law of geometric progression. And the temperature rise inside the machine comes from the power consumption of every circuit in the machine. Transformer is one of them. If there is no transformer, the power consumption can be reduced. So in this sense, because of the existence of transformer, to a certain extent, the reliability of the system is reduced. The mistake here is to confuse the mechanical stability and electrical performance of transformers. The stability …

Daily maintenance of telecom power supply

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Under normal operation, high frequency switching power supply equipment has little maintenance workload, mainly dustproof and regular dedusting. Especially in the area where the climate is dry, the dust in the air is more and the dust will be deposited in the machine. When the air is wet, the host control disorder will cause the main engine to be disturbed and the inaccurate alarm will occur. A large amount of dust also causes poor heat dissipation in the device. Generally, every quarter should be thoroughly cleaned. The second is to check whether the connectors and plugging parts are loose or unfastened during the dust removal. Because rectifier can not eliminate instantaneous pulse interference, there is still interference pulse after rectification. In addition to the function of storing DC power, the equivalent capacitance of the battery is directly proportional to the capacity of the storage battery. Therefore, maintenance of battery work is very important, although the battery p…

Advantages of pure sine wave inverter power supply to important load equipment

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Pure sine wave inverter power supply is specially designed for power plant, substation, communication industry, automation control equipment, solar energy, oil field, wind energy, new energy and so on. It is mainly applied to places where load equipment has high requirements to power quality. Such as power telecontrol, RTU, power line carrier, monitor, program-controlled switchboard, computer room, network, server and accident lighting. If the AC input is broken down, the DC screen or the external battery cabinet prepared by the power system and the telecommunications system will supply a long and uninterrupted power supply through the inverter for the load equipment. If the DC screen is broken down, the inverter overloads or failed, the system will automatically switch to the bypass power supply, which ensures the continuity of the system power supply. The use of pure sine wave inverter power supply to important load equipment in DC power station has the following advantages: 1.Avoid…

The daily maintenance requirements of the power supply system of the telecom room are as follows

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1.Check the power equipment regularly. Pay attention to the environment temperature and equipment operation status of the computer room, use the power supply monitoring system to monitor all kinds of operation parameters of the power equipment in real time, and find out the problems in time. 2.Power inspection content. Whether the configuration of the module is reasonable; Whether the charge current limit is correct or not; System AC voltage and current, DC floating charging voltage, load current, battery supplementary electric current, fan running status and lightning protection device status; Whether the running parameters of the monitoring module are correct or not; Whether the temperature compensation is normally used; Whether the module’s average flow is less than 5%; Battery insurance and connection bar temperature rise; Whether the battery is climbing acid, leaking or bulging; The ambient temperature of the machine room, etc. 3.The power supply monitoring system is used to mon…

The definition of low frequency UPS and high frequency UPS

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Low frequency UPS and high frequency UPS are distinguished according to the operating frequency of the design circuit of UPS. Low frequency UPS is designed on the basis of traditional analog circuit, composed of thyristor (SCR) rectifier, IGBT inverter, bypass and power frequency step-up isolation transformer. Because of its rectifier and transformer working frequency are 50Hz, so called low frequency UPS. High frequency UPS is usually composed of IGBT high frequency rectifier, battery converter, inverter and bypass. The IGBT can control its opening and closing by adding control to the gate. The switching frequency of the IGBT rectifier is usually from thousands of Hz to tens of kHz, even up to a hundred kHz, far higher than the low frequency UPS, so it is called high frequency UPS.
GP9335C 10-800KVA Low Frequency Online UPS ■Use advanced 6th generation DSP and full digital control technologies to realize higher system stability.
■Output power factor is 0.9, carrying capacity than conve…