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What is the role and principle of the isolation transformer

First, why use isolation transformer Why use an isolation transformer? When supplying power to a low-voltage user, the power supply system generally adopts a three-phase four-wire system. The neutral line is grounded, that is, the wires to the residents’ homes, one is the phase line (the fire line), and the other is the neutral line. It is in the same position as the earth. When the human body touches the hot bottom plate, it will cause current to flow through…

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Hermetically sealed transformer causes overvoltage

Hermetically sealed transformer is the electrical equipment that transforms voltage and transmits electrical energy in the power grid. It is the carrier that the power grid supplies power to users. Therefore, the safety of transformers is related to people’s living electricity. However, Sealed power transformers often have various faults during operation. One of the common problems is overvoltage. Overvoltage refers to the phenomenon that the rms value of the AC voltage rises at the power frequency, exceeding 10% of the…

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Difference and application of aluminum substrate and glass fiber board

The PCB board is a printed circuit board, which is a general term for commonly used circuit boards. It is divided into: cardboard, semi-glass fiberboard, fiberglass board, metal substrate, etc. according to the material. First, fiberglass board (FR4, single-sided, double-sided, multi-layer PCB circuit board, impedance board, blind buried hole board), suitable for electronic digital products such as computers and mobile phones. There are many kinds of glass fiber board, we will first look together; FR-4 is also known as fiberglass…

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Classification of DC regulated power supply and its functional application

A regulated power supply is an electronic device that provides a stable AC or DC power supply to the load. When the grid voltage fluctuates instantaneously, the regulated power supply compensates the voltage amplitude with a response speed of 10-30ms, which makes it stable within ±2%. In addition to the most basic stable voltage function, the regulator should have overvoltage protection (+10% of output voltage), undervoltage protection (-10% lower than output voltage), phase loss protection, short circuit overload protection. Basic…

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5G high frequency copper clad laminates passed the test of the designated testing agency of the Ministry of Industry and Information Technology of China

The copper-clad high-frequency electronic substrate products (hereinafter referred to as “5G high-frequency copper-clad boards“) for the 5G communication equipment developed and produced by ZTELEC GROUP have been successfully tested by the third-party testing institutions designated by the Ministry of Industry and Information Technology, marking ZTELEC’s first high at 5G. The development of frequency-covered copper plates has been successful. 5G high frequency copper clad laminate is an essential foundation material for the 5G era The 5G high-frequency substrate is the latest…

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What is the difference between PVC sheet and PP sheet?

PP sheet is polypropylene plastic Specific gravity: 0.9-0.91 g / cm 3 Molding shrinkage: 1.0-2.5% Molding temperature: 160-220 ° C Low density, strength and stiffness, can be used at about 100 degrees. It has good electrical properties and high-frequency insulation, which is not affected by humidity, but becomes brittle at low temperature and is not resistant to mold aging. It is suitable for making general mechanical parts and corrosion-resistant parts. And insulating parts Molding performance 1. Crystallized material, low hygroscopicity,…

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Common phase shift rectifier transformer cooling medium

There are three common cooling methods for phase-shifting rectifier transformers: oil-immersed self-cooling, oil-immersed air-cooled, and forced oil circulation. Oil-immersed self-cooling: the natural convection of oil brings heat to the tank wall and heat pipe. Then it relies on the convective conduction of air to dissipate heat. It has no special cooling equipment. Oil-immersed air-cooled type: It is equipped with a fan on the tank wall or the heat pipe on the basis of oil-immersed self-cooling type, and uses a hair…

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The difference between PVC, FEP and FET

Pvc and fep are similar because they are all typical plastics. Pvc is relatively cheap, fep has a long service life, and is mostly used for auxiliary materials such as support, packaging, and casing. Most of the polymer materials such as plastics and rubber are pvc, polyvinyl chloride, the most common plastics, most of the pipes and switches used today, and its insulation is also very good. Low cost and strong mechanical properties. If it is used electronically, it is…

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The role of double-wall heat shrinkable sleeve with glue

Nowadays, in this evolving 21st century, technology and products are constantly changing and changing. Just like the appearance of double-wall heat-shrinkable tubes with glue, it has also paved the way for other products. The double-wall heat shrinkable sleeve with glue is actually a heat-shrinkable tube. Its surface layer is made of high-quality cross-linked polyolefin material, and the inner layer is processed by hot-melt adhesive compounding, which plays a protective role. First, the outer material of the double-wall heat-shrinkable sleeve with…

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How to diagnose the failure of dry distribution transformers

The dry type transformer is a little noise when it is running. This is a very normal phenomenon, but sometimes there will be a lot of noise, which means that the sound can be judged whether the transformer is faulty. In fact, the sound of dry distribution transformers can also be seen to see if there is any damage. In general, the dry transformer has several problems in the sound, which indicates that the dry transformer has failed and must…

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