Jiangshan Xinyuan Electric Co., Ltd
Xinyuan has a large number of customers including foreign capital and joint venture customers across the country, such as Guangdong, Shanghai, Beijing, Jiangsu, and Zhejiang, providing them with precise solutions to various problems timely in the process of localization, which have been highly praised by users. The supported products are exported to many Southeast Asian countries.
Do you know all the wiring methods of dry-type transformers?
Users need to master the wiring method when using dry-type transformers. If there is a problem in the wiring, it is easy to cause malfunction. So what is the wiring method of the dry-type transformer? The following editor will introduce it in detail. Wiring method of dry-type transformer: 1. Short-circuit the "input" and "output" terminals of the transformer to test the insulation resistance with the ground wire with a megohmmeter. When measuring with a 1000V megger, the resistance is greater than 2M ohms. 2. The cross-section wiring of the transformer input and output power lines should meet the requirements of the current value; it is appropriate to configure the current density at 2-2.5 A/min2. 3. The input and output three-phase power lines should be connected to phase A, phase B, and phase C respectively according to the color of the busbar of the transformer terminal block, yellow, green, and red. The neutral line should be connected to the neutral neutral line of the transformer, the grounding line and the transformer The shell and the transformer point are connected. The ground and neutral wires we usually talk about are drawn from the neutral point of the transformer. (For example, the transformer box should be connected to the corresponding ground mark of the box body). Check the input and output lines to confirm that they are correct. 4. First power on at no-load and observe and test that the input and output voltages meet the requirements. At the same time, observe whether the machine has abnormal noises, sparks, odors and other abnormal phenomena. If there are abnormalities, please disconnect the input power. 5. After the no-load test is completed and normal, the load can be connected.
Do you know how the transformer is operated and maintained? Senior electrician explained, gain knowledge
One. Several rated operation modes of transformers 1. Allowable range of transformer voltage change For a power transformer, if the voltage is not higher than its rated voltage, then this will not have a great impact on the transformer itself, but will only reduce the output of the transformer; In a transformer, if the voltage has exceeded its rated voltage, this will increase its reactive power loss and core loss. Therefore, this will have some bad effects on the insulation performance of the transformer.
Use and maintenance of dry-type transformers
With the exception of individual product series, dry-type transformers with air as the insulating medium are less able to withstand impulse voltage than oil-immersed transformers. Therefore, their use conditions are generally limited to indoors that are not directly connected to overhead lines, so they will not be exposed to the atmosphere. Otherwise, special lightning protection should be added to ensure that the amplitude of atmospheric overvoltage does not exceed the amplitude of the power frequency test voltage.
Dry-type transformer temperature standard
Dry-type transformers are widely used in local lighting, high-rise buildings, airports, terminal CNC machinery equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When natural air cooling, the transformer can run continuously for a long time under the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be kept in continuous overload operation for a long time.
The principle of intelligent controller and its application in fans and pumps
I. Introduction Fans and pumps are a kind of general-purpose machinery, which is widely used in various fields such as industry, agriculture and life. At the same time, various design codes also have corresponding specific requirements for the control and protection of fans and pumps in different situations in the construction field. With the rapid development of the construction industry, building automatic monitoring systems (BAS, Build Automatic Monitor System) are also commonly used in buildings and large-scale public building construction projects. 2. Intelligent controller The intelligent controller uses the 32-bit ColdFire V1 core MCF51EM256 processor introduced by Freescale as the control core, 4 channels of 16-bit SAR ADC, 3 SPI, 3 SCI and 1 I2C interface, 3 timing module hardware, independent The RTC clock and two LASH memories, abundant GPIO ports, and abundant CPU Katayama resources ensure the reliability and advancement of the module. The controller integrates measurement, protection, control, and bus communication. It replaces the original protection relays, electrical measuring instruments, changeover switches, buttons and signal indicators that are configured with separate components. It integrates direct start, star-delta start, etc. Various control methods. At the same time, it provides records of important management information such as operation times, running time, and trip events. The bus communication function can carry out data exchange and remote control with the management system, which improves the intelligent level of the building and simplifies the traditional control cabinet design.
How to quickly understand the wiring diagram of the temperature controller? How to wire the two-wire three-wire temperature sensor?
Hello, my friends, I’m Big Brother, today let’s talk about the wiring of the temperature controller. There are many models of temperature controllers, and the output methods are slightly different, but the wiring principle is the same. As long as we understand the working principle, we can directly wire any temperature controller.
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